Water pollution is the contamination of water bodies such as lakes, rivers, oceans, and groundwater caused by human activities, which can be harmful to organisms and plants that live in these water bodies. It occurs when pollutants are discharged directly into water bodies without treating it first.
Water pollution is a major problem in the global context. It has been suggested that it is the leading worldwide cause of deaths and diseases, and that it accounts for the deaths of more than 14,000 people daily. In addition to the acute problems of water pollution in developing countries, industrialized countries continue to struggle with pollution problems as well. In the most recent national report on water quality in the United States, 45 percent of assessed stream miles, 47 percent of assessed lake acres, and 32 percent of assessed bay and estuarine square miles were classified as polluted.
Water is typically referred to as polluted when it is impaired by anthropogenic contaminants and either does not support a human use, like serving as drinking water, and/or undergoes a marked shift in its ability to support its constituent biotic communities, such as fish. Natural phenomena such as volcanoes, algae blooms, storms, and earthquakes also cause major changes in water quality and the ecological status of water. Water pollution has many causes and characteristics.
ransport and chemical reactions of water pollutants
Most water pollutants are eventually carried by rivers into the oceans. In some areas of the world the influence can be traced hundred miles from the mouth by studies using hydrology transport models. Advanced computer models such as SWMM or the DSSAM Model have been used in many locations worldwide to examine the fate of pollutants in aquatic systems. Indicator filter feeding species such as copepods have also been used to study pollutant fates in the New York Bight, for example. The highest toxin loads are not directly at the mouth of the Hudson River, but 100 kilometers south, since several days are required for incorporation into planktonic tissue. The Hudson discharge flows south along the coast due to coriolis force. Further south then are areas of oxygen depletion, caused by chemicals using up oxygen and by algae blooms, caused by excess nutrients from algal cell death and decomposition. Fish and shellfish kills have been reported, because toxins climb the food chain after small fish consume copepods, then large fish eat smaller fish, etc. Each successive step up the food chain causes a stepwise concentration of pollutants such as heavy metals (e.g. mercury) and persistent organic pollutants such as DDT. This is known as biomagnification, which is occasionally used interchangeably with bioaccumulation.
Large gyres (vortexes) in the oceans trap floating plastic debris. The North Pacific Gyre for example has collected the so-called "Great Pacific Garbage Patch" that is now estimated at 100 times the size of Texas. Many of these long-lasting pieces wind up in the stomachs of marine birds and animals. This results in obstruction of digestive pathways which leads to reduced appetite or even starvation.
Many chemicals undergo reactive decay or chemically change especially over long periods of time in groundwater reservoirs. A noteworthy class of such chemicals is the chlorinated hydrocarbons such as trichloroethylene (used in industrial metal degreasing and electronics manufacturing) and tetrachloroethylene used in the dry cleaning industry (note latest advances in liquid carbon dioxide in dry cleaning that avoids all use of chemicals). Both of these chemicals, which are carcinogens themselves, undergo partial decomposition reactions, leading to new hazardous chemicals (including dichloroethylene and vinyl chloride).
Groundwater pollution is much more difficult to abate than surface pollution because groundwater can move great distances through unseen aquifers. Non-porous aquifers such as clays partially purify water of bacteria by simple filtration (adsorption and absorption), dilution, and, in some cases, chemical reactions and biological activity: however, in some cases, the pollutants merely transform to soil contaminants. Groundwater that moves through cracks and caverns is not filtered and can be transported as easily as surface water. In fact, this can be aggravated by the human tendency to use natural sinkholes as dumps in areas of Karst topography.
There are a variety of secondary effects stemming not from the original pollutant, but a derivative condition. An example is silt-bearing surface runoff, which can inhibit the penetration of sunlight through the water column, hampering photosynthesis in aquatic plants.
Tuesday, April 28, 2009
TSUNAMI
A tsunami is a series of waves that is created when a large volume of a body of water, such as an ocean, is rapidly displaced. The Japanese term is literally translated into "(great) harbor wave."
Earthquakes, volcanic eruptions and other underwater explosions (detonations of nuclear devices at sea), landslides, bolide impacts, and other mass movements above or below water all have the potential to generate a tsunami. Due to the immense volumes of water and energy involved, the effects of tsunamis can be devastating.
The Greek historian Thucydides was the first to relate tsunami to submarine quakes, but understanding of the nature of tsunami remained slim until the 20th century and is the subject of ongoing research.
Many early geological, geographical, and oceanographic texts refer to tsunamis as "seismic sea waves."
Some meteorological storm conditions such as deep depressions causing cyclones, hurricanes, can generate a storm surge which can be several metres above normal tide levels. This is due to the low atmospheric pressure within the centre of the depression. As these storm surges come ashore, they may resemble (though are not) tsunamis, inundating vast areas of land. Such a storm surge inundated Burma (Myanmar) in May 2008.
Causes : - A tsunami can be generated when converging or destructive plate boundaries abruptly move and vertically displace the overlying water. It is very unlikely that they can form at divergent (constructive) or conservative plate boundaries. This is because constructive or conservative boundaries do not generally disturb the vertical displacement of the water column. Subduction zone related earthquakes generate the majority of all tsunamis.
Tsunamis have a small amplitude (wave height) offshore, and a very long wavelength (often hundreds of kilometers long), which is why they generally pass unnoticed at sea, forming only a slight swell usually about 300 mm above the normal sea surface. They grow in height when they reach shallower water, in a "shoaling" process described below. A tsunami can occur at any state of the tide and even at low tide will still inundate coastal areas if the incoming waves surge high enough.
On April 1, 1946 a Magnitude 7.8 (Richter Scale) earthquake occurred near the Aleutian Islands, Alaska. It generated a tsunami which inundated Hilo on the island of Hawai'i with a 14 m high surge. The area where the earthquake occurred is where the Pacific Ocean floor is subducting (or being pushed downwards) under Alaska.
Examples of tsunami being generated at locations away from convergent boundaries include Storegga during the Neolithic era, Grand Banks 1929, Papua New Guinea 1998 (Tappin, 2001). In the case of the Grand Banks and Papua New Guinea tsunamis an earthquake caused sediments to become unstable and subsequently fail. These slumped and as they flowed down slope a tsunami was generated. These tsunami did not travel transoceanic distances.
It is not known what caused the Storegga sediments to fail. It may have been due to overloading of the sediments causing them to become unstable and they then failed solely as a result of being overloaded. It is also possible that an earthquake caused the sediments to become unstable and then fail. Another theory is that a release of gas hydrates (methane etc.,) caused the slump.
The "Great Chilean earthquake" (19:11 hrs UTC) May 22, 1960 (9.5 Mw), the March 27, 1964 "Good Friday earthquake" Alaska 1964 (9.2 Mw), and the "Great Sumatra-Andaman earthquake" (00:58:53 UTC) December 26, 2004 (9.2 Mw), are recent examples of powerful megathrust earthquakes that generated a tsunami that was able to cross oceans. Smaller (4.2 Mw) earthquakes in Japan can trigger tsunami that can devastate nearby coasts within 15 minutes or less.
In the 1950s it was hypothesised that larger tsunamis than had previously been believed possible may be caused by landslides, explosive volcanic action e.g., Santorini, Krakatau, and impact events when they contact water. These phenomena rapidly displace large volumes of water, as energy from falling debris or expansion is transferred to the water into which the debris falls at a rate faster than the ocean water can absorb it. They have been named by the media as "mega-tsunami."
Tsunami caused by these mechanisms, unlike the trans-oceanic tsunami caused by some earthquakes, may dissipate quickly and rarely affect coastlines distant from the source due to the small area of sea affected. These events can give rise to much larger local shock waves (solitons), such as the landslide at the head of Lituya Bay 1958, which produced a wave with an initial surge estimated at 524 m. However, an extremely large gravitational landslide might generate a so called "mega-tsunami" that may have the ability to travel trans-oceanic distances. This though is strongly debated and there is no actual geological evidence to support this hypothesis.
Earthquakes, volcanic eruptions and other underwater explosions (detonations of nuclear devices at sea), landslides, bolide impacts, and other mass movements above or below water all have the potential to generate a tsunami. Due to the immense volumes of water and energy involved, the effects of tsunamis can be devastating.
The Greek historian Thucydides was the first to relate tsunami to submarine quakes, but understanding of the nature of tsunami remained slim until the 20th century and is the subject of ongoing research.
Many early geological, geographical, and oceanographic texts refer to tsunamis as "seismic sea waves."
Some meteorological storm conditions such as deep depressions causing cyclones, hurricanes, can generate a storm surge which can be several metres above normal tide levels. This is due to the low atmospheric pressure within the centre of the depression. As these storm surges come ashore, they may resemble (though are not) tsunamis, inundating vast areas of land. Such a storm surge inundated Burma (Myanmar) in May 2008.
Causes : - A tsunami can be generated when converging or destructive plate boundaries abruptly move and vertically displace the overlying water. It is very unlikely that they can form at divergent (constructive) or conservative plate boundaries. This is because constructive or conservative boundaries do not generally disturb the vertical displacement of the water column. Subduction zone related earthquakes generate the majority of all tsunamis.
Tsunamis have a small amplitude (wave height) offshore, and a very long wavelength (often hundreds of kilometers long), which is why they generally pass unnoticed at sea, forming only a slight swell usually about 300 mm above the normal sea surface. They grow in height when they reach shallower water, in a "shoaling" process described below. A tsunami can occur at any state of the tide and even at low tide will still inundate coastal areas if the incoming waves surge high enough.
On April 1, 1946 a Magnitude 7.8 (Richter Scale) earthquake occurred near the Aleutian Islands, Alaska. It generated a tsunami which inundated Hilo on the island of Hawai'i with a 14 m high surge. The area where the earthquake occurred is where the Pacific Ocean floor is subducting (or being pushed downwards) under Alaska.
Examples of tsunami being generated at locations away from convergent boundaries include Storegga during the Neolithic era, Grand Banks 1929, Papua New Guinea 1998 (Tappin, 2001). In the case of the Grand Banks and Papua New Guinea tsunamis an earthquake caused sediments to become unstable and subsequently fail. These slumped and as they flowed down slope a tsunami was generated. These tsunami did not travel transoceanic distances.
It is not known what caused the Storegga sediments to fail. It may have been due to overloading of the sediments causing them to become unstable and they then failed solely as a result of being overloaded. It is also possible that an earthquake caused the sediments to become unstable and then fail. Another theory is that a release of gas hydrates (methane etc.,) caused the slump.
The "Great Chilean earthquake" (19:11 hrs UTC) May 22, 1960 (9.5 Mw), the March 27, 1964 "Good Friday earthquake" Alaska 1964 (9.2 Mw), and the "Great Sumatra-Andaman earthquake" (00:58:53 UTC) December 26, 2004 (9.2 Mw), are recent examples of powerful megathrust earthquakes that generated a tsunami that was able to cross oceans. Smaller (4.2 Mw) earthquakes in Japan can trigger tsunami that can devastate nearby coasts within 15 minutes or less.
In the 1950s it was hypothesised that larger tsunamis than had previously been believed possible may be caused by landslides, explosive volcanic action e.g., Santorini, Krakatau, and impact events when they contact water. These phenomena rapidly displace large volumes of water, as energy from falling debris or expansion is transferred to the water into which the debris falls at a rate faster than the ocean water can absorb it. They have been named by the media as "mega-tsunami."
Tsunami caused by these mechanisms, unlike the trans-oceanic tsunami caused by some earthquakes, may dissipate quickly and rarely affect coastlines distant from the source due to the small area of sea affected. These events can give rise to much larger local shock waves (solitons), such as the landslide at the head of Lituya Bay 1958, which produced a wave with an initial surge estimated at 524 m. However, an extremely large gravitational landslide might generate a so called "mega-tsunami" that may have the ability to travel trans-oceanic distances. This though is strongly debated and there is no actual geological evidence to support this hypothesis.
SECULARISM
Secularism is the assertion that governmental practices or institutions should exist separately from religion and/or religious beliefs.
In one sense, secularism may assert the right to be free from religious rule and teachings, and freedom from the government imposition of religion upon the people, within a state that is neutral on matters of belief, and gives no state privileges or subsidies to religions. (See also Separation of church and state and Laïcité.) In another sense, it refers to a belief that human activities and decisions, especially political ones, should be based on evidence and fact unbiased by religious influence. (See also public reason.)
In its most prominent form, secularism is critical of religious orthodoxy and asserts that religion impedes human progress because of its focus on superstition and dogma versus reason and scientific method. Secularism draws its intellectual roots from Greek and Roman philosophers such as Marcus Aurelius and Epicurus, Enlightenment thinkers like Denis Diderot, Voltaire, Thomas Jefferson, and Thomas Paine, and modern freethinkers, agnostics and atheists such as Robert Ingersoll, Albert Einstein, Sam Harris, and Richard Dawkins.
The purposes and arguments in support of secularism vary widely. In European laicism, it has been argued that secularism is a movement toward modernization, and away from traditional religious values. This type of secularism, on a social or philosophical level, has often occurred while maintaining an official state church or other state support of religion. In the United States, some argue that state secularism has served to a greater extent to protect religion from governmental interference, while secularism on a social level is less prevalent. Within countries as well, differing political movements support secularism for varying reasons.
The term "secularism" was first used by the British writer George Holyoake in 1846. Although the term was new, the general notions of freethought on which it was based had existed throughout history. In particular, early secular ideas involving the separation of philosophy and religion can be traced back to Ibn Rushd (Averroes) and the Averroism school of philosophy. Holyoake invented the term "secularism" to describe his views of promoting a social order separate from religion, without actively dismissing or criticizing religious belief.
An agnostic himself, Holyoake argued that "Secularism is not an argument against Christianity, it is one independent of it. It does not question the pretensions of Christianity; it advances others. Secularism does not say there is no light or guidance elsewhere, but maintains that there is light and guidance in secular truth, whose conditions and sanctions exist independently, and act forever. Secular knowledge is manifestly that kind of knowledge which is founded in this life, which relates to the conduct of this life, conduces to the welfare of this life, and is capable of being tested by the experience of this life."
Barry Kosmin of the Institute for the Study of Secularism in Society and Culture breaks modern secularism into two types: hard and soft secularism. According to Kosmin, "the hard secularist considers religious propositions to be epistemologically illegitimate, warranted by neither reason nor experience." However, in the view of soft secularism, "the attainment of absolute truth was impossible and therefore skepticism and tolerance should be the principle and overriding values in the discussion of science and religion.
In one sense, secularism may assert the right to be free from religious rule and teachings, and freedom from the government imposition of religion upon the people, within a state that is neutral on matters of belief, and gives no state privileges or subsidies to religions. (See also Separation of church and state and Laïcité.) In another sense, it refers to a belief that human activities and decisions, especially political ones, should be based on evidence and fact unbiased by religious influence. (See also public reason.)
In its most prominent form, secularism is critical of religious orthodoxy and asserts that religion impedes human progress because of its focus on superstition and dogma versus reason and scientific method. Secularism draws its intellectual roots from Greek and Roman philosophers such as Marcus Aurelius and Epicurus, Enlightenment thinkers like Denis Diderot, Voltaire, Thomas Jefferson, and Thomas Paine, and modern freethinkers, agnostics and atheists such as Robert Ingersoll, Albert Einstein, Sam Harris, and Richard Dawkins.
The purposes and arguments in support of secularism vary widely. In European laicism, it has been argued that secularism is a movement toward modernization, and away from traditional religious values. This type of secularism, on a social or philosophical level, has often occurred while maintaining an official state church or other state support of religion. In the United States, some argue that state secularism has served to a greater extent to protect religion from governmental interference, while secularism on a social level is less prevalent. Within countries as well, differing political movements support secularism for varying reasons.
The term "secularism" was first used by the British writer George Holyoake in 1846. Although the term was new, the general notions of freethought on which it was based had existed throughout history. In particular, early secular ideas involving the separation of philosophy and religion can be traced back to Ibn Rushd (Averroes) and the Averroism school of philosophy. Holyoake invented the term "secularism" to describe his views of promoting a social order separate from religion, without actively dismissing or criticizing religious belief.
An agnostic himself, Holyoake argued that "Secularism is not an argument against Christianity, it is one independent of it. It does not question the pretensions of Christianity; it advances others. Secularism does not say there is no light or guidance elsewhere, but maintains that there is light and guidance in secular truth, whose conditions and sanctions exist independently, and act forever. Secular knowledge is manifestly that kind of knowledge which is founded in this life, which relates to the conduct of this life, conduces to the welfare of this life, and is capable of being tested by the experience of this life."
Barry Kosmin of the Institute for the Study of Secularism in Society and Culture breaks modern secularism into two types: hard and soft secularism. According to Kosmin, "the hard secularist considers religious propositions to be epistemologically illegitimate, warranted by neither reason nor experience." However, in the view of soft secularism, "the attainment of absolute truth was impossible and therefore skepticism and tolerance should be the principle and overriding values in the discussion of science and religion.
AIDS
Acquired immune deficiency syndrome or acquired immunodeficiency syndrome (AIDS) is a disease of the human immune system caused by the human immunodeficiency virus (HIV).
This condition progressively reduces the effectiveness of the immune system and leaves individuals susceptible to opportunistic infections and tumors. HIV is transmitted through direct contact of a mucous membrane or the bloodstream with a bodily fluid containing HIV, such as blood, semen, vaginal fluid, preseminal fluid, and breast milk.
This transmission can involve anal, vaginal or oral sex, blood transfusion, contaminated hypodermic needles, exchange between mother and baby during pregnancy, childbirth, or breastfeeding, or other exposure to one of the above bodily fluids.
AIDS is now a pandemic.In 2007, it was estimated that 33.2 million people lived with the disease worldwide, and that AIDS had killed an estimated 2.1 million people, including 330,000 children.Over three-quarters of these deaths occurred in sub-Saharan Africa,retarding economic growth and destroying human capital.
Genetic research indicates that HIV originated in west-central Africa during the late nineteenth or early twentieth century. AIDS was first recognized by the U.S. Centers for Disease Control and Prevention in 1981 and its cause, HIV, identified in the early 1980s.
Although treatments for AIDS and HIV can slow the course of the disease, there is currently no vaccine or cure. Antiretroviral treatment reduces both the mortality and the morbidity of HIV infection, but these drugs are expensive and routine access to antiretroviral medication is not available in all countries.Due to the difficulty in treating HIV infection, preventing infection is a key aim in controlling the AIDS epidemic, with health organizations promoting safe sex and needle-exchange programmes in attempts to slow the spread of the virus.
This condition progressively reduces the effectiveness of the immune system and leaves individuals susceptible to opportunistic infections and tumors. HIV is transmitted through direct contact of a mucous membrane or the bloodstream with a bodily fluid containing HIV, such as blood, semen, vaginal fluid, preseminal fluid, and breast milk.
This transmission can involve anal, vaginal or oral sex, blood transfusion, contaminated hypodermic needles, exchange between mother and baby during pregnancy, childbirth, or breastfeeding, or other exposure to one of the above bodily fluids.
AIDS is now a pandemic.In 2007, it was estimated that 33.2 million people lived with the disease worldwide, and that AIDS had killed an estimated 2.1 million people, including 330,000 children.Over three-quarters of these deaths occurred in sub-Saharan Africa,retarding economic growth and destroying human capital.
Genetic research indicates that HIV originated in west-central Africa during the late nineteenth or early twentieth century. AIDS was first recognized by the U.S. Centers for Disease Control and Prevention in 1981 and its cause, HIV, identified in the early 1980s.
Although treatments for AIDS and HIV can slow the course of the disease, there is currently no vaccine or cure. Antiretroviral treatment reduces both the mortality and the morbidity of HIV infection, but these drugs are expensive and routine access to antiretroviral medication is not available in all countries.Due to the difficulty in treating HIV infection, preventing infection is a key aim in controlling the AIDS epidemic, with health organizations promoting safe sex and needle-exchange programmes in attempts to slow the spread of the virus.
FEMALE EDUCATION
Female education is a catch-all term for a complex of issues and debates surrounding education (primary education, secondary education, tertiary education and health education in particular) for females. It includes areas of gender equality and access to education, and its connection to the alleviation of poverty. Also involved are the issues of single-sex education and religious education, in that the division of education along gender lines, and religious teachings on education, have been traditionally dominant, and are still highly relevant in contemporary discussion of female education as a global consideration. While the feminist movement has certainly promoted the importance of the issues attached to female education, discussion is wide-ranging and by no means confined to narrow terms of reference: it includes for example AIDS.
Modern period : - The issue of female education in the large, as emancipatory and rational, is broached seriously in the Enlightenment. Mary Wollstonecraft is a writer who dealt with it in those terms.
Actual progress in institutional terms, for secular education of women, began in the West in the nineteenth century, with the founding of colleges offering single-sex education to young women. These appeared in the middle of the century. The Princess: A Medley, a narrative poem by Alfred Lord Tennyson, is a satire of women's education, still a controversial subject in 1848, when Queen's College first opened in London. Emily Davies campaigned for women's education in the 1860s, and founded Girton College in 1869.
W. S. Gilbert parodied the poem and treated the themes of women's higher education and feminism in general with The Princess in (1870) and Princess Ida in 1883. Once women began to graduate from institutions of higher education, there steadily developed also a stronger academic stream of schooling, and the teacher training of women in larger numbers, principally to provide primary education. Women's access to traditionally all-male institutions took several generations to become complete.
Educational reform : - The interrelated themes of barriers to education and employment continued to form the backbone of feminist thought in the nineteenth century, as described, for instance by Harriet Martineau in her 1859 article “Female Industry” in the Edinburgh Journal. The economy was changing but women’s lot was not. Martineau, however, remained a moderate, for practical reasons, and unlike Cobbe, did not support the emerging call for the vote.
Slowly the efforts of women like Davies and the Langham group started to make inroads. Queen’s College (1848) and Bedford College (1849) in London were starting to offer some education to women from 1848, and by 1862 Davies was establishing a committee to persuade the universities to allow women to sit for the recently established (1858) Local Examinations, with partial success (1865). A year later she published “The Higher Education of Women.” She and Leigh Smith founded the first higher educational institution for women, with 5 students, which became Girton College, Cambridge in 1873, followed by Lady Margaret Hall at Oxford in 1879. Bedford had started awarding degrees the previous year. Despite these measurable advances, few could take advantage of them and life for women students was very difficult.
As part of the continuing dialogue between British and American feminists, Elizabeth Blackwell, the first woman in the US to graduate in medicine (1849), lectured in Britain with Langham support. They also supported Elizabeth Garrett’s attempts to assail the walls of British medical education against virulent opposition, eventually taking her degree in France. Garrett’s very successful campaign to run for office on the London School Board in 1870 is another example of a how a small band of very determined women were starting to reach positions of influence at the level of local government and public bodies.
Modern period : - The issue of female education in the large, as emancipatory and rational, is broached seriously in the Enlightenment. Mary Wollstonecraft is a writer who dealt with it in those terms.
Actual progress in institutional terms, for secular education of women, began in the West in the nineteenth century, with the founding of colleges offering single-sex education to young women. These appeared in the middle of the century. The Princess: A Medley, a narrative poem by Alfred Lord Tennyson, is a satire of women's education, still a controversial subject in 1848, when Queen's College first opened in London. Emily Davies campaigned for women's education in the 1860s, and founded Girton College in 1869.
W. S. Gilbert parodied the poem and treated the themes of women's higher education and feminism in general with The Princess in (1870) and Princess Ida in 1883. Once women began to graduate from institutions of higher education, there steadily developed also a stronger academic stream of schooling, and the teacher training of women in larger numbers, principally to provide primary education. Women's access to traditionally all-male institutions took several generations to become complete.
Educational reform : - The interrelated themes of barriers to education and employment continued to form the backbone of feminist thought in the nineteenth century, as described, for instance by Harriet Martineau in her 1859 article “Female Industry” in the Edinburgh Journal. The economy was changing but women’s lot was not. Martineau, however, remained a moderate, for practical reasons, and unlike Cobbe, did not support the emerging call for the vote.
Slowly the efforts of women like Davies and the Langham group started to make inroads. Queen’s College (1848) and Bedford College (1849) in London were starting to offer some education to women from 1848, and by 1862 Davies was establishing a committee to persuade the universities to allow women to sit for the recently established (1858) Local Examinations, with partial success (1865). A year later she published “The Higher Education of Women.” She and Leigh Smith founded the first higher educational institution for women, with 5 students, which became Girton College, Cambridge in 1873, followed by Lady Margaret Hall at Oxford in 1879. Bedford had started awarding degrees the previous year. Despite these measurable advances, few could take advantage of them and life for women students was very difficult.
As part of the continuing dialogue between British and American feminists, Elizabeth Blackwell, the first woman in the US to graduate in medicine (1849), lectured in Britain with Langham support. They also supported Elizabeth Garrett’s attempts to assail the walls of British medical education against virulent opposition, eventually taking her degree in France. Garrett’s very successful campaign to run for office on the London School Board in 1870 is another example of a how a small band of very determined women were starting to reach positions of influence at the level of local government and public bodies.
MASS MEDIA
Mass media is a term used to denote a section of the media specifically envisioned and designed to reach a very large audience such as the population of a nation state. It was coined in the 1920s with the advent of nationwide radio networks, mass-circulation newspapers and magazines, although mass media (like books and manuscripts) were present centuries before the term became common.
The term public media has a similar meaning: it is the sum of the public mass distributors of news and entertainment across media such as newspapers, television, radio, broadcasting, which may require union membership in some large markets such as Newspaper Guild, AFTRA, & text publishers. The concept of mass media is now complicated by Internet media (like blogs, message boards, podcasts, and video sharing) because individuals now have a means to exposure that is comparable in scale to that previously restricted to a select group of mass media producers.
The communications audience has been viewed by some commentators as forming a mass society with special characteristics, notably atomization or lack of social connections, which render it especially susceptible to the influence of modern mass-media techniques such as advertising and propaganda. The term "MSM" or "mainstream media" has been widely used in the blogosphere in discussion of the mass media and media bias.
Types of drama in numerous cultures were probably the first mass-media, going back into the Ancient World. The first dated printed book known is the "Diamond Sutra", printed in China in 868 AD, although it is clear that books were printed earlier. Movable clay type was invented in 1041 in China. However, due to the slow spread of literacy to the masses in China, and the relatively high cost of paper there, the earliest printed mass-medium was probably European popular prints from about 1400. Although these were produced in huge numbers, very few early examples survive, and even most known to be printed before about 1600 have not survived. Johannes Gutenberg printed the first book on a printing press with movable type in 1453. This invention transformed the way the world received printed materials, although books remained too expensive really to be called a mass-medium for at least a century after that.
Newspapers developed around from 1612, with the first example in English in 1620 ; but they took until the nineteenth century to reach a mass-audience directly.
During the 20th century, the growth of mass media was driven by technology that allowed the massive duplication of material. Physical duplication technologies such as printing, record pressing and film duplication allowed the duplication of books, newspapers and movies at low prices to huge audiences. Radio and television allowed the electronic duplication of information for the first time.
Mass media had the economics of linear replication: a single work could make money proportional to the number of copies sold, and as volumes went up, units costs went down, increasing profit margins further. Vast fortunes were to be made in mass media. In a democratic society, independent media serve /electorate about issues regarding government and corporate entities (see Media influence). Some consider the concentration of media ownership to be a grave threat to democracy.
The term public media has a similar meaning: it is the sum of the public mass distributors of news and entertainment across media such as newspapers, television, radio, broadcasting, which may require union membership in some large markets such as Newspaper Guild, AFTRA, & text publishers. The concept of mass media is now complicated by Internet media (like blogs, message boards, podcasts, and video sharing) because individuals now have a means to exposure that is comparable in scale to that previously restricted to a select group of mass media producers.
The communications audience has been viewed by some commentators as forming a mass society with special characteristics, notably atomization or lack of social connections, which render it especially susceptible to the influence of modern mass-media techniques such as advertising and propaganda. The term "MSM" or "mainstream media" has been widely used in the blogosphere in discussion of the mass media and media bias.
Types of drama in numerous cultures were probably the first mass-media, going back into the Ancient World. The first dated printed book known is the "Diamond Sutra", printed in China in 868 AD, although it is clear that books were printed earlier. Movable clay type was invented in 1041 in China. However, due to the slow spread of literacy to the masses in China, and the relatively high cost of paper there, the earliest printed mass-medium was probably European popular prints from about 1400. Although these were produced in huge numbers, very few early examples survive, and even most known to be printed before about 1600 have not survived. Johannes Gutenberg printed the first book on a printing press with movable type in 1453. This invention transformed the way the world received printed materials, although books remained too expensive really to be called a mass-medium for at least a century after that.
Newspapers developed around from 1612, with the first example in English in 1620 ; but they took until the nineteenth century to reach a mass-audience directly.
During the 20th century, the growth of mass media was driven by technology that allowed the massive duplication of material. Physical duplication technologies such as printing, record pressing and film duplication allowed the duplication of books, newspapers and movies at low prices to huge audiences. Radio and television allowed the electronic duplication of information for the first time.
Mass media had the economics of linear replication: a single work could make money proportional to the number of copies sold, and as volumes went up, units costs went down, increasing profit margins further. Vast fortunes were to be made in mass media. In a democratic society, independent media serve /electorate about issues regarding government and corporate entities (see Media influence). Some consider the concentration of media ownership to be a grave threat to democracy.
PHYSICAL ORGANIC CHEMISTRY
Physical organic chemistry is the study of the interrelationships between structure and reactivity in organic molecules. It can be seen as the study of organic chemistry using tools of physical chemistry such as chemical equilibrium, chemical kinetics, thermochemistry, and quantum chemistry. The term "physical organic chemistry" is commonly attributed to Louis Hammett, who used it as a title for a book in 1940.
The two main themes in physical organic chemistry are structure and reactivity. The study of structure starts from chemical bonding, with special emphasis on the stability of organic molecules due to factors such as steric strain and aromaticity. Other topics in structure include stereochemistry and conformational analysis. Supramolecular structure is also considered in terms of intermolecular forces including hydrogen bonding. Finally, the acid-base chemistry of the molecules is studied in terms of structure, based on resonance and inductive effects and through the use of linear free-energy relations.
The study of reactivity focuses on the mechanisms of organic reactions. It uses chemical kinetics, spectroscopy, isotope effects, and quantum chemistry to determine the sequence of elementary steps involved in a reaction. These elementary steps can be classified in a few major classes: addition, elimination, substitution, and pericyclic reactions. The mechanisms are commonly expressed in terms of "electron pushing" and potential energy surfaces. Other major topics are photochemistry, the effect of light on the reactivity of organic molecules, and solvent effects on organic reactions.
Structure and reactivity are both involved in the study of reaction intermediates—the transient species involved in reaction mechanisms. The main types of intermediates of interest are carbocations, carbanions, free radicals, and carbenes. Usually, these intermediates are not isolated, but their presence is inferred from stereochemical evidence, spectroscopy, or through the use of chemical traps. In some cases, however, it is possible to isolate these types of molecules at very low temperatures (cryochemistry) or via matrix isolation. It is also possible to create specific derivatives that are stabilized through chemical means such as resonance, as in the case of the triphenylmethyl radical.
The two main themes in physical organic chemistry are structure and reactivity. The study of structure starts from chemical bonding, with special emphasis on the stability of organic molecules due to factors such as steric strain and aromaticity. Other topics in structure include stereochemistry and conformational analysis. Supramolecular structure is also considered in terms of intermolecular forces including hydrogen bonding. Finally, the acid-base chemistry of the molecules is studied in terms of structure, based on resonance and inductive effects and through the use of linear free-energy relations.
The study of reactivity focuses on the mechanisms of organic reactions. It uses chemical kinetics, spectroscopy, isotope effects, and quantum chemistry to determine the sequence of elementary steps involved in a reaction. These elementary steps can be classified in a few major classes: addition, elimination, substitution, and pericyclic reactions. The mechanisms are commonly expressed in terms of "electron pushing" and potential energy surfaces. Other major topics are photochemistry, the effect of light on the reactivity of organic molecules, and solvent effects on organic reactions.
Structure and reactivity are both involved in the study of reaction intermediates—the transient species involved in reaction mechanisms. The main types of intermediates of interest are carbocations, carbanions, free radicals, and carbenes. Usually, these intermediates are not isolated, but their presence is inferred from stereochemical evidence, spectroscopy, or through the use of chemical traps. In some cases, however, it is possible to isolate these types of molecules at very low temperatures (cryochemistry) or via matrix isolation. It is also possible to create specific derivatives that are stabilized through chemical means such as resonance, as in the case of the triphenylmethyl radical.
FILM SCORE
A film score is a broad term referring to the music in a film, which is generally categorically separated from songs used within a film. The term soundtrack is often confused with film score, though a soundtrack may also include songs featured in the film as well as previously released music by other artists, while the score does not. A score is written specifically to accompany a film, by the original film's composer(s).
Each individual piece of music, within a film's score, is called a cue and is typically a composition for instruments (eg. orchestra) and/or non-individually featured voices. Since the 1950s, a growing number of scores are electronic or a hybrid of orchestral and electronic instruments. Since the invention of digital technology and audio sampling, many low budget films have been able to rely on digital samples to imitate the sound of real live instruments.
Before the age of recorded sound in motion pictures, great effort was taken to provide suitable music for films, usually through the services of an in-house pianist or organist, and, in some cases, entire orchestras, typically given cue sheets as a guide. In 1914, The Oz Film Manufacturing Company sent full-length scores by Louis F. Gottschalk for their films. Other examples of this include Victor Herbert's score in 1915 to Fall of a Nation (a sequel to Birth of a Nation) and Camille Saint-Saëns' music for L'Assassinat du duc de Guise in 1908 — arguably the very first in movie history. It was preceded by Nathaniel D. Mann's score for The Fairylogue and Radio-Plays by four months, but that was a mixture of interrelated stage and film performance in the tradition of old magic lantern shows. Most accompaniments at this time, these examples notwithstanding, comprised pieces by famous composers, also including studies. These were often used to form catalogues of film music, which had different subsections broken down by 'mood' and/or genre: dark, sad, suspense, action, chase, etc. This made things much easier for the in-house pianists and orchestras to pick pieces that fitted the particular feel of a movie and its scenes.
German cinema, which was highly influential in the era of silent movies, provided some original scores. Fritz Lang's movies Die Nibelungen (1924) and Metropolis (1927) were accompanied by original full scale orchestral and leitmotific scores written by Gottfried Huppertz, who also wrote piano-versions of his music, so that it could be played in smaller cinemas, too. Friedrich W. Murnau's movies Nosferatu (1922 - music by Hans Erdmann) and Faust – eine deutsche Volkssage (1926 - music by Werner Richard Heymann) also had original scores written for them. Other films like Murnaus's Der letzte Mann contained a mixing of original compositions (in this case by Giuseppe Becce) and library music / folk tunes, which were artistically included into the score by the composer. Nevertheless fully developed original scores were quite rare in the silent movie era. It should also be noted that as soon as sound had come to movies, director Fritz Lang barely used musical scores in his movies anymore. Apart of Peter Lorre whistling a short piece from Edvard Grieg's Peer Gynt, Lang's movie M - Eine Stadt sucht einen Mörder was lacking musical accompaniment completely and Das Testament des Dr. Mabuse only included one original piece written for the movie by Hans Erdmann played at the very beginning and end of the movie. One of the rare occasions on which music occurs in the movie is a song one of the characters sings, that Lang uses to put emphasis on the man's insanity, quite similar to the use of the whistling in M.
A full film score widely regarded as the first made by a popular artist came in 1973 with the film Pat Garret and Billy the Kid, by Bob Dylan. However the album received very little critical acclaim. This had not been done before in popular film history: any featured band had films written around the music (notably The Beatles with Yellow Submarine).
Each individual piece of music, within a film's score, is called a cue and is typically a composition for instruments (eg. orchestra) and/or non-individually featured voices. Since the 1950s, a growing number of scores are electronic or a hybrid of orchestral and electronic instruments. Since the invention of digital technology and audio sampling, many low budget films have been able to rely on digital samples to imitate the sound of real live instruments.
Before the age of recorded sound in motion pictures, great effort was taken to provide suitable music for films, usually through the services of an in-house pianist or organist, and, in some cases, entire orchestras, typically given cue sheets as a guide. In 1914, The Oz Film Manufacturing Company sent full-length scores by Louis F. Gottschalk for their films. Other examples of this include Victor Herbert's score in 1915 to Fall of a Nation (a sequel to Birth of a Nation) and Camille Saint-Saëns' music for L'Assassinat du duc de Guise in 1908 — arguably the very first in movie history. It was preceded by Nathaniel D. Mann's score for The Fairylogue and Radio-Plays by four months, but that was a mixture of interrelated stage and film performance in the tradition of old magic lantern shows. Most accompaniments at this time, these examples notwithstanding, comprised pieces by famous composers, also including studies. These were often used to form catalogues of film music, which had different subsections broken down by 'mood' and/or genre: dark, sad, suspense, action, chase, etc. This made things much easier for the in-house pianists and orchestras to pick pieces that fitted the particular feel of a movie and its scenes.
German cinema, which was highly influential in the era of silent movies, provided some original scores. Fritz Lang's movies Die Nibelungen (1924) and Metropolis (1927) were accompanied by original full scale orchestral and leitmotific scores written by Gottfried Huppertz, who also wrote piano-versions of his music, so that it could be played in smaller cinemas, too. Friedrich W. Murnau's movies Nosferatu (1922 - music by Hans Erdmann) and Faust – eine deutsche Volkssage (1926 - music by Werner Richard Heymann) also had original scores written for them. Other films like Murnaus's Der letzte Mann contained a mixing of original compositions (in this case by Giuseppe Becce) and library music / folk tunes, which were artistically included into the score by the composer. Nevertheless fully developed original scores were quite rare in the silent movie era. It should also be noted that as soon as sound had come to movies, director Fritz Lang barely used musical scores in his movies anymore. Apart of Peter Lorre whistling a short piece from Edvard Grieg's Peer Gynt, Lang's movie M - Eine Stadt sucht einen Mörder was lacking musical accompaniment completely and Das Testament des Dr. Mabuse only included one original piece written for the movie by Hans Erdmann played at the very beginning and end of the movie. One of the rare occasions on which music occurs in the movie is a song one of the characters sings, that Lang uses to put emphasis on the man's insanity, quite similar to the use of the whistling in M.
A full film score widely regarded as the first made by a popular artist came in 1973 with the film Pat Garret and Billy the Kid, by Bob Dylan. However the album received very little critical acclaim. This had not been done before in popular film history: any featured band had films written around the music (notably The Beatles with Yellow Submarine).
SHEET MUSIC
Music is an art form whose medium is sound organized in time. Common elements of music are pitch (which governs melody and harmony), rhythm (and its associated concepts tempo, meter, and articulation), dynamics, and the sonic qualities of timbre and texture. The word derives from Greek μουσική (mousike), "(art) of the Muses".
The creation, performance, significance, and even the definition of music vary according to culture and social context. Music ranges from strictly organized compositions (and their recreation in performance), through improvisational music to aleatoric forms. Music can be divided into genres and subgenres, although the dividing lines and relationships between music genres are often subtle, sometimes open to individual interpretation, and occasionally controversial. Within "the arts", music may be classified as a performing art, a fine art, and auditory art.
To people in many cultures, music is inextricably intertwined into their way of life. Greek philosophers and ancient Indians defined music as tones ordered horizontally as melodies and vertically as harmonies. Common sayings such as "the harmony of the spheres" and "it is music to my ears" point to the notion that music is often ordered and pleasant to listen to. However, 20th-century composer John Cage thought that any sound can be music, saying, for example, "There is no noise, only sound." According to musicologist Jean-Jacques Nattiez, "the border between music and noise is always culturally defined—which implies that, even within a single society, this border does not always pass through the same place; in short, there is rarely a consensus.… By all accounts there is no single and intercultural universal concept defining what music might be, except that it is 'sound through time'.
Sheet music is a hand-written or printed form of musical notation; like its analogs—books, pamphlets, etc.—the medium of sheet music typically is paper (or, in earlier times, parchment), although the access to musical notation in recent years includes also presentation on computer screens. Use of the term "sheet" is intended to differentiate music on paper from an audio presentation, which would ensue from a sound recording, broadcast, or live performance, which may involve video as well. In everyday use, "sheet music" (or simply "music") can refer to the print publication of commercial music in conjunction with the release of a new film, show, record album, or other special or popular event which involves music.
Score is a common alternative (and more generic) term for sheet music, and there are several types of scores, as discussed below. (Note: the term score can also refer to incidental music written for a play, television programme, or film;
Before the 15th century, western music was written by hand and preserved in manuscripts, usually bound in large volumes. The best known examples of these are medieval manuscripts of monophonic chant. In the case of medieval polyphony, such as the motet, writing space was economized by copying the parts in separate portions of facing pages, thus making possible performance by the fewest number of soloists needed. (This process was aided by the advent of mensural notation to clarify rhythm and was paralleled by the medieval practice of composing parts of polyphony sequentially, rather than simultaneously as in later times.) Manuscripts showing parts together in score format were rare, and limited mostly to organum, especially that of the Notre Dame school.
Even after the advent of music printing, much music continued to exist solely in manuscripts well into the 18th century
The creation, performance, significance, and even the definition of music vary according to culture and social context. Music ranges from strictly organized compositions (and their recreation in performance), through improvisational music to aleatoric forms. Music can be divided into genres and subgenres, although the dividing lines and relationships between music genres are often subtle, sometimes open to individual interpretation, and occasionally controversial. Within "the arts", music may be classified as a performing art, a fine art, and auditory art.
To people in many cultures, music is inextricably intertwined into their way of life. Greek philosophers and ancient Indians defined music as tones ordered horizontally as melodies and vertically as harmonies. Common sayings such as "the harmony of the spheres" and "it is music to my ears" point to the notion that music is often ordered and pleasant to listen to. However, 20th-century composer John Cage thought that any sound can be music, saying, for example, "There is no noise, only sound." According to musicologist Jean-Jacques Nattiez, "the border between music and noise is always culturally defined—which implies that, even within a single society, this border does not always pass through the same place; in short, there is rarely a consensus.… By all accounts there is no single and intercultural universal concept defining what music might be, except that it is 'sound through time'.
Sheet music is a hand-written or printed form of musical notation; like its analogs—books, pamphlets, etc.—the medium of sheet music typically is paper (or, in earlier times, parchment), although the access to musical notation in recent years includes also presentation on computer screens. Use of the term "sheet" is intended to differentiate music on paper from an audio presentation, which would ensue from a sound recording, broadcast, or live performance, which may involve video as well. In everyday use, "sheet music" (or simply "music") can refer to the print publication of commercial music in conjunction with the release of a new film, show, record album, or other special or popular event which involves music.
Score is a common alternative (and more generic) term for sheet music, and there are several types of scores, as discussed below. (Note: the term score can also refer to incidental music written for a play, television programme, or film;
Before the 15th century, western music was written by hand and preserved in manuscripts, usually bound in large volumes. The best known examples of these are medieval manuscripts of monophonic chant. In the case of medieval polyphony, such as the motet, writing space was economized by copying the parts in separate portions of facing pages, thus making possible performance by the fewest number of soloists needed. (This process was aided by the advent of mensural notation to clarify rhythm and was paralleled by the medieval practice of composing parts of polyphony sequentially, rather than simultaneously as in later times.) Manuscripts showing parts together in score format were rare, and limited mostly to organum, especially that of the Notre Dame school.
Even after the advent of music printing, much music continued to exist solely in manuscripts well into the 18th century
LINEAR VIDEO EDITING
Linear video editing is the process of selecting, arranging and modifying the images and sound recorded on videotape whether captured by a video camera, generated from a computer graphics program or recorded in a studio. Until the advent of computer-based non-linear editing in the early 1990s "linear video editing" was simply called “video editing.”
Television was primarily a live medium until the introduction of videotape. The function of shot edits, were, in live television production, performed by switching from among two or more cameras. This was (and is) accomplished using a video switcher, an electronic device capable of handling two or more synchronized video inputs and combining them into a video output. A switcher can be used to perform cuts between video sources, or any number of longer transitions, such as wipes, fades and dissolves, with multiple sources.
Actual live television is still basically produced in the same manner as it was in the 1950s (although transformed by myriad technical advances). However, the only way of airing the same shows again before videotape was introduced was by filming shows using a kinescope (essentially, a video monitor paired with a movie camera). However, kinescopes (the films of television shows) suffered from various sorts of picture degradation, from image distortion and apparent scan lines to artifacts in contrast and loss of detail. Also, kinescopes had to be processed and printed in a film laboratory, making them somewhat dicey for broadcasts delayed for different time zones.
So, the primary motivation for the development of videotape was as a short- or long-term archival medium. Only after a series of technical advances spanning decades did videotape editing finally become a viable production tool on a par with film editing.
The first widely-accepted videotape in the United States was 2 inches wide and travelled at 15 inches per second. To gain enough head-to-tape speed, four video recording and playback heads were spun on a head wheel across most of the 2-inch width of the tape. (Audio and synchronization tracks were recorded along the sides of the tape with stationary heads.) This system was known as Quad, for quadruplex recording. See 2 inch Quadruplex videotape.
The resulting video tracks were slightly less than a ninety-degree angle (considering the vector addition of high-speed spinning heads tracing across the 15 inches per second forward motion of the tape).
Television was primarily a live medium until the introduction of videotape. The function of shot edits, were, in live television production, performed by switching from among two or more cameras. This was (and is) accomplished using a video switcher, an electronic device capable of handling two or more synchronized video inputs and combining them into a video output. A switcher can be used to perform cuts between video sources, or any number of longer transitions, such as wipes, fades and dissolves, with multiple sources.
Actual live television is still basically produced in the same manner as it was in the 1950s (although transformed by myriad technical advances). However, the only way of airing the same shows again before videotape was introduced was by filming shows using a kinescope (essentially, a video monitor paired with a movie camera). However, kinescopes (the films of television shows) suffered from various sorts of picture degradation, from image distortion and apparent scan lines to artifacts in contrast and loss of detail. Also, kinescopes had to be processed and printed in a film laboratory, making them somewhat dicey for broadcasts delayed for different time zones.
So, the primary motivation for the development of videotape was as a short- or long-term archival medium. Only after a series of technical advances spanning decades did videotape editing finally become a viable production tool on a par with film editing.
The first widely-accepted videotape in the United States was 2 inches wide and travelled at 15 inches per second. To gain enough head-to-tape speed, four video recording and playback heads were spun on a head wheel across most of the 2-inch width of the tape. (Audio and synchronization tracks were recorded along the sides of the tape with stationary heads.) This system was known as Quad, for quadruplex recording. See 2 inch Quadruplex videotape.
The resulting video tracks were slightly less than a ninety-degree angle (considering the vector addition of high-speed spinning heads tracing across the 15 inches per second forward motion of the tape).
CREATIVE INDUSTRIES
The phrase creative industries (or sometimes creative economy) refers to a set of interlocking industry sectors that focus on creating unique property, content or design that previously did not exist. Economic contributions from creative industries have been increasing, particularly as manufacturing industries have become increasingly automated and process-driven. The economic contributions are often cited as being a growing part of the global economy.
Creative industries typically include industries that focus on: creating and exploiting intellectual property products such as music, books, film and games; or providing business-to-business creative services including advertising, public relations and direct marketing. Aesthetic live-performance experiences are also generally included, which contributes to an overlap with definitions of art and culture, and even aspects of tourism and sport. Economic activities focussed on designing, making and selling objects or works of art such as jewellery, haute couture, books of poetry and other creative writing, and fine art are often included in the sector because the value of such objects derives from a high degree of aesthetic originality.
Creative industries exclude, and contrast with, industries that derive value by transferring ownership of pre-existing property (such as retail, financial-services and real-estate industries), by making a commoditised product or service (such as auto-manufacturing and electric-utility industries), and by maintaining or enhancing what already exists (such as the auto-repair industry).
How creative workers are counted : - The DCMS classifies enterprises and occupations as creative according to what the enterprise primarily produces, and what the worker primarily does. Thus, a company which produces records would be classified as belonging to the music industrial sector, and a worker who plays piano would be classified as a musician.
The primary purpose of this is to quantify - for example it can be used to count the number of firms, and the number of workers, creatively employed in any given location, and hence to identify places with particularly high concentrations of creative activities.
It leads to some complications which are not immediately obvious. For example, a security guard working for a music company would be classified as a creative employee, although not as creatively occupied.
The total number of creative employees is then calculated as the sum of:
* all workers employed in creative industries, whether or not creatively occupied (eg all musicians, security guards, cleaners, accountants, managers, etc working for a record company)
* all workers that are creatively occupied, and are not employed in creative industries (for example, a piano teacher in a school). This includes people whose second job is creative, for example somebody who does weekend gigs, writes books, or produces artwork in her spare time
Creative industries typically include industries that focus on: creating and exploiting intellectual property products such as music, books, film and games; or providing business-to-business creative services including advertising, public relations and direct marketing. Aesthetic live-performance experiences are also generally included, which contributes to an overlap with definitions of art and culture, and even aspects of tourism and sport. Economic activities focussed on designing, making and selling objects or works of art such as jewellery, haute couture, books of poetry and other creative writing, and fine art are often included in the sector because the value of such objects derives from a high degree of aesthetic originality.
Creative industries exclude, and contrast with, industries that derive value by transferring ownership of pre-existing property (such as retail, financial-services and real-estate industries), by making a commoditised product or service (such as auto-manufacturing and electric-utility industries), and by maintaining or enhancing what already exists (such as the auto-repair industry).
How creative workers are counted : - The DCMS classifies enterprises and occupations as creative according to what the enterprise primarily produces, and what the worker primarily does. Thus, a company which produces records would be classified as belonging to the music industrial sector, and a worker who plays piano would be classified as a musician.
The primary purpose of this is to quantify - for example it can be used to count the number of firms, and the number of workers, creatively employed in any given location, and hence to identify places with particularly high concentrations of creative activities.
It leads to some complications which are not immediately obvious. For example, a security guard working for a music company would be classified as a creative employee, although not as creatively occupied.
The total number of creative employees is then calculated as the sum of:
* all workers employed in creative industries, whether or not creatively occupied (eg all musicians, security guards, cleaners, accountants, managers, etc working for a record company)
* all workers that are creatively occupied, and are not employed in creative industries (for example, a piano teacher in a school). This includes people whose second job is creative, for example somebody who does weekend gigs, writes books, or produces artwork in her spare time
MULTIMEDIA
Multimedia is media and content that utilizes a combination of different content forms. The term can be used as a noun (a medium with multiple content forms) or as an adjective describing a medium as having multiple content forms. The term is used in contrast to media which only utilize traditional forms of printed or hand-produced material. Multimedia includes a combination of text, audio, still images, animation, video, and interactivity content forms.
Multimedia is usually recorded and played, displayed or accessed by information content processing devices, such as computerized and electronic devices, but can also be part of a live performance. Multimedia (as an adjective) also describes electronic media devices used to store and experience multimedia content. Multimedia is similar to traditional mixed media in fine art, but with a broader scope. The term "rich media" is synonymous for interactive multimedia. Hypermedia can be considered one particular multimedia application.
Multimedia finds its application in various areas including, but not limited to, advertisements, art, education, entertainment, engineering, medicine, mathematics, business, scientific research and spatial temporal applications.
Major characteristics of multimedia : - Multimedia presentations may be viewed in person on stage, projected, transmitted, or played locally with a media player. A broadcast may be a live or recorded multimedia presentation. Broadcasts and recordings can be either analog or digital electronic media technology. Digital online multimedia may be downloaded or streamed. Streaming multimedia may be live or on-demand.
Multimedia games and simulations may be used in a physical environment with special effects, with multiple users in an online network, or locally with an offline computer, game system, or simulator. The various formats of technological or digital multimedia may be intended to enhance the users' experience, for example to make it easier and faster to convey information. Or in entertainment or art, to transcend everyday experience.
Enhanced levels of interactivity are made possible by combining multiple forms of media content. Online multimedia is increasingly becoming object-oriented and data-driven, enabling applications with collaborative end-user innovation and personalization on multiple forms of content over time. Examples of these range from multiple forms of content on Web sites like photo galleries with both images (pictures) and title (text) user-updated, to simulations whose co-efficients, events, illustrations, animations or videos are modifiable, allowing the multimedia "experience" to be altered without reprogramming. In addition to seeing and hearing, Haptic technology enables virtual objects to be felt. Emerging technology involving illusions of taste and smell may also enhance the multimedia experience.
Multimedia is usually recorded and played, displayed or accessed by information content processing devices, such as computerized and electronic devices, but can also be part of a live performance. Multimedia (as an adjective) also describes electronic media devices used to store and experience multimedia content. Multimedia is similar to traditional mixed media in fine art, but with a broader scope. The term "rich media" is synonymous for interactive multimedia. Hypermedia can be considered one particular multimedia application.
Multimedia finds its application in various areas including, but not limited to, advertisements, art, education, entertainment, engineering, medicine, mathematics, business, scientific research and spatial temporal applications.
Major characteristics of multimedia : - Multimedia presentations may be viewed in person on stage, projected, transmitted, or played locally with a media player. A broadcast may be a live or recorded multimedia presentation. Broadcasts and recordings can be either analog or digital electronic media technology. Digital online multimedia may be downloaded or streamed. Streaming multimedia may be live or on-demand.
Multimedia games and simulations may be used in a physical environment with special effects, with multiple users in an online network, or locally with an offline computer, game system, or simulator. The various formats of technological or digital multimedia may be intended to enhance the users' experience, for example to make it easier and faster to convey information. Or in entertainment or art, to transcend everyday experience.
Enhanced levels of interactivity are made possible by combining multiple forms of media content. Online multimedia is increasingly becoming object-oriented and data-driven, enabling applications with collaborative end-user innovation and personalization on multiple forms of content over time. Examples of these range from multiple forms of content on Web sites like photo galleries with both images (pictures) and title (text) user-updated, to simulations whose co-efficients, events, illustrations, animations or videos are modifiable, allowing the multimedia "experience" to be altered without reprogramming. In addition to seeing and hearing, Haptic technology enables virtual objects to be felt. Emerging technology involving illusions of taste and smell may also enhance the multimedia experience.
VISUAL COMMUNICATIONS
Visual Communications (Southern California Asian American Studies Central Inc.) – known as "VC" – is a community-based non-profit media arts organization in Los Angeles, dedicated to creating, preserving and presenting Asian Pacific American history and culture through the media arts. Founded in 1970, the organization, through its numerous film, video and community multimedia productions and through its various screening activities, photographic exhibits and publications, has pioneered many vital developments in the national media arts arena. VC offers production and training in filmmaking, video and photography, for Asian Americans. In addition to maintaining a large archive of Asian Pacific photographs, VC annually presents the Los Angeles Asian Pacific Film Festival.
To promote intercultural understanding through the creation, presentation, preservation and support of media works by and about Asian Pacific Americans. VC was created with the understanding that media and the arts are important vehicles to organize and empower communities, build connections between generations, challenge perspectives, and create an environment for critical thinking, necessary to build a more just and humane society.
Visual culture is a field of study that generally includes some combination of cultural studies, art history, critical theory, philosophy, and anthropology, by focusing on aspects of culture that rely on visual images. Among theorists working within contemporary culture, this often overlaps with film studies, psychoanalytic theory, gender studies, queer theory, and the study of television; it can also include video game studies, comics, traditional artistic media, advertising, the Internet, and any other medium that has a crucial visual component. Because of the changing technological aspects of visual culture as well as a scientific method-derived desire to create taxonomies or articulate what the "visual" is, many aspects of Visual Culture overlap with the study of science and technology, including hybrid electronic media, cognitive science, neurology, and image and brain theory. It also may overlap with another emerging field, that of "Performance Studies." "Visual Culture" goes by a variety of names at different institutions, including Visual and Critical Studies, Visual and Cultural Studies, and Visual Studies.
Early work on visual culture has been done by John Berger (Ways of Seeing, 1972) and Laura Mulvey (Visual Pleasure and Narrative Cinema, 1975) that follows on from Jacques Lacan's theorization of the unconscious gaze. Late nineteenth-century practitioners of visual knowledge, such as Georgy Kepes and William Ivins, as well as iconic phenomenologists like Maurice Merleau-Ponty also played a role creating a foundation for the discipline.
Major work on visual culture has been done by W. J. T. Mitchell, particularly in his books Iconology and Picture Theory and by the art historian and cultural theorist Griselda Pollock. Other writers important to visual culture include Stuart Hall, Jean-François Lyotard, Rosalind Krauss and Slavoj Zizek. Continuing work has been done by Lisa Cartwright, Margarita Dikovitskaya, Chris Jencks, Nicholas Mirzoeff and Gail Finney. Visual Culture studies have been increasingly important in religious studies through the work of David Morgan, Sally Promey, Jeffrey Hamburger, and S. Brent Plate.
Several major universities now either house or are developing graduate programs in Visual Studies. They include: Coventry University, Duke University, University of Wisconsin, Madison, University of Rochester, University of California, Irvine, University of California, San Diego, University of California, Santa Cruz, University of Southern California, State University of New York, Buffalo(MFA program), The School of the Art Institute of Chicago (MA only, not PhD), California College of the Arts, Goldsmiths, University of London, University of East London, Kingston University, New York University, Middlesex University, Chinese University of Hong Kong, University of Art and Design Helsinki, Pori Department of Art and Media, University of Copenhagen, University of Pennsylvania (undergraduate only), Grand Valley State University (undergraduate only), University College, London and the University of Lisbon. Cornell University has been offering an undergraduate degree in Visual Studies, but as yet has not established a dedicated graduate program.
Northern Illinois University offers programs in studying visual culture in art education at the undergraduate, graduate, and doctorate levels. The university of limerick, Ireland offers under graduates the option to study modules in visual cultural studies. The School of the Art Institute of Chicago offers both undergraduate and graduate degrees in Visual and Critical Studies, in which academic writing coexists with artistic production as a legitimate mode of research. They are currently working on developing a PhD in Visual and Critical Studies with a similar interdisciplinary structure. Duke University's Visual Studies Initiative is highly interdisciplinary, with collaborators not only in the humanities but also in the sciences, social sciences, and engineering.
To promote intercultural understanding through the creation, presentation, preservation and support of media works by and about Asian Pacific Americans. VC was created with the understanding that media and the arts are important vehicles to organize and empower communities, build connections between generations, challenge perspectives, and create an environment for critical thinking, necessary to build a more just and humane society.
Visual culture is a field of study that generally includes some combination of cultural studies, art history, critical theory, philosophy, and anthropology, by focusing on aspects of culture that rely on visual images. Among theorists working within contemporary culture, this often overlaps with film studies, psychoanalytic theory, gender studies, queer theory, and the study of television; it can also include video game studies, comics, traditional artistic media, advertising, the Internet, and any other medium that has a crucial visual component. Because of the changing technological aspects of visual culture as well as a scientific method-derived desire to create taxonomies or articulate what the "visual" is, many aspects of Visual Culture overlap with the study of science and technology, including hybrid electronic media, cognitive science, neurology, and image and brain theory. It also may overlap with another emerging field, that of "Performance Studies." "Visual Culture" goes by a variety of names at different institutions, including Visual and Critical Studies, Visual and Cultural Studies, and Visual Studies.
Early work on visual culture has been done by John Berger (Ways of Seeing, 1972) and Laura Mulvey (Visual Pleasure and Narrative Cinema, 1975) that follows on from Jacques Lacan's theorization of the unconscious gaze. Late nineteenth-century practitioners of visual knowledge, such as Georgy Kepes and William Ivins, as well as iconic phenomenologists like Maurice Merleau-Ponty also played a role creating a foundation for the discipline.
Major work on visual culture has been done by W. J. T. Mitchell, particularly in his books Iconology and Picture Theory and by the art historian and cultural theorist Griselda Pollock. Other writers important to visual culture include Stuart Hall, Jean-François Lyotard, Rosalind Krauss and Slavoj Zizek. Continuing work has been done by Lisa Cartwright, Margarita Dikovitskaya, Chris Jencks, Nicholas Mirzoeff and Gail Finney. Visual Culture studies have been increasingly important in religious studies through the work of David Morgan, Sally Promey, Jeffrey Hamburger, and S. Brent Plate.
Several major universities now either house or are developing graduate programs in Visual Studies. They include: Coventry University, Duke University, University of Wisconsin, Madison, University of Rochester, University of California, Irvine, University of California, San Diego, University of California, Santa Cruz, University of Southern California, State University of New York, Buffalo(MFA program), The School of the Art Institute of Chicago (MA only, not PhD), California College of the Arts, Goldsmiths, University of London, University of East London, Kingston University, New York University, Middlesex University, Chinese University of Hong Kong, University of Art and Design Helsinki, Pori Department of Art and Media, University of Copenhagen, University of Pennsylvania (undergraduate only), Grand Valley State University (undergraduate only), University College, London and the University of Lisbon. Cornell University has been offering an undergraduate degree in Visual Studies, but as yet has not established a dedicated graduate program.
Northern Illinois University offers programs in studying visual culture in art education at the undergraduate, graduate, and doctorate levels. The university of limerick, Ireland offers under graduates the option to study modules in visual cultural studies. The School of the Art Institute of Chicago offers both undergraduate and graduate degrees in Visual and Critical Studies, in which academic writing coexists with artistic production as a legitimate mode of research. They are currently working on developing a PhD in Visual and Critical Studies with a similar interdisciplinary structure. Duke University's Visual Studies Initiative is highly interdisciplinary, with collaborators not only in the humanities but also in the sciences, social sciences, and engineering.
VISUAL EFFECTS
Visual effects (commonly shortened to Visual F/X or VFX) are the various processes by which imagery is created and/or manipulated outside the context of a live action shoot. Visual effects often involve the integration of live-action footage and computer generated imagery (CGI) in order to create environments which look realistic, but would be dangerous, costly, or simply impossible to capture on film. They have become increasingly common in big-budget films, and have also recently become accessible to the amateur filmmaker with the introduction of affordable animation and compositing software.
Timing : - Visual effects are frequently integral to a movie's story and appeal. Although most visual effects work is completed during post-production, it usually must be carefully planned and choreographed in pre-production and production. A visual effects supervisor is usually involved with the production from an early stage to work closely with production and the film's director to achieve the desired effects.
Rear projection is an in-camera special effects technique in film production for combining foreground performances with pre-filmed backgrounds. It was widely used for many years in driving scenes, or to show other forms of "distant" background motion. The presence of a movie screen between the background image and foreground objects leads to a distinctive washed-out look that makes these "process shots" recognizable.
Technique : - The actors stand in front of a screen while a projector positioned behind the screen casts a reversed image of the background. This required a large space to film, as the projector had to be placed some distance from the back of the screen. Frequently the background image would appear faint and washed out compared to the foreground. The film that is projected can be still or moving, but is always called the plate. One might hear the command "Roll plate." to instruct stage crew to begin projecting.
These so-called process shots were widely used to film actors as if they were inside a moving vehicle, who were, in reality, in a vehicle mock-up on a soundstage. In these cases the motion of the backdrop film and foreground actors and props were often different due to the lack of steadicam-like imaging from the moving vehicles used to produce the plate. This was most noticeable as bumps and jarring motions of the background image that would not be duplicated by the actors.
A major advance over rear projection is front projection, which uses a special screen material to allow the plate to be projected from the front of the screen. This results in a much sharper and more saturated image. Although the technique had been used experimentally for some time, it was during the filming of 2001: A Space Odyssey that the modern version was fully developed. In this case it was used to avoid costly on-location shots in Africa during the opening scenes of the movie, but the effect was also used throughout the film for a variety of shots into or out of the windows of spacecraft. 2001 also used rear projection to produce computer screen effects.
As front projection and bluescreen effects became more widespread and less costly, rear projection has been rendered largely obsolete. Quentin Tarantino used the process for the taxi ride sequence of Pulp Fiction, and James Cameron used rear projection for several special effects shots within Aliens, including the crash of the Dropship. Also, the Austin Powers film series frequently used rear projection to help give it the feel of old spy movies.
A front projection effect is an in-camera visual effects process in film production for combining foreground performance with pre-filmed background footage
Timing : - Visual effects are frequently integral to a movie's story and appeal. Although most visual effects work is completed during post-production, it usually must be carefully planned and choreographed in pre-production and production. A visual effects supervisor is usually involved with the production from an early stage to work closely with production and the film's director to achieve the desired effects.
Rear projection is an in-camera special effects technique in film production for combining foreground performances with pre-filmed backgrounds. It was widely used for many years in driving scenes, or to show other forms of "distant" background motion. The presence of a movie screen between the background image and foreground objects leads to a distinctive washed-out look that makes these "process shots" recognizable.
Technique : - The actors stand in front of a screen while a projector positioned behind the screen casts a reversed image of the background. This required a large space to film, as the projector had to be placed some distance from the back of the screen. Frequently the background image would appear faint and washed out compared to the foreground. The film that is projected can be still or moving, but is always called the plate. One might hear the command "Roll plate." to instruct stage crew to begin projecting.
These so-called process shots were widely used to film actors as if they were inside a moving vehicle, who were, in reality, in a vehicle mock-up on a soundstage. In these cases the motion of the backdrop film and foreground actors and props were often different due to the lack of steadicam-like imaging from the moving vehicles used to produce the plate. This was most noticeable as bumps and jarring motions of the background image that would not be duplicated by the actors.
A major advance over rear projection is front projection, which uses a special screen material to allow the plate to be projected from the front of the screen. This results in a much sharper and more saturated image. Although the technique had been used experimentally for some time, it was during the filming of 2001: A Space Odyssey that the modern version was fully developed. In this case it was used to avoid costly on-location shots in Africa during the opening scenes of the movie, but the effect was also used throughout the film for a variety of shots into or out of the windows of spacecraft. 2001 also used rear projection to produce computer screen effects.
As front projection and bluescreen effects became more widespread and less costly, rear projection has been rendered largely obsolete. Quentin Tarantino used the process for the taxi ride sequence of Pulp Fiction, and James Cameron used rear projection for several special effects shots within Aliens, including the crash of the Dropship. Also, the Austin Powers film series frequently used rear projection to help give it the feel of old spy movies.
A front projection effect is an in-camera visual effects process in film production for combining foreground performance with pre-filmed background footage
COMPUTER ANIMATION (OR CGI ANIMATION)
Computer animation (or CGI animation) is the art of creating moving images with the use of computers. It is a subfield of computer graphics and animation. Increasingly it is created by means of 3D computer graphics, though 2D computer graphics are still widely used for stylistic, low bandwidth, and faster real-time rendering needs. Sometimes the target of the animation is the computer itself, but sometimes the target is another medium, such as film. It is also referred to as CGI (computer-generated imagery or computer-generated imaging), especially when used in films.
To create the illusion of movement, an image is displayed on the computer, screen and repeatedly replaced by a new image that is similar to the previous image, but advanced slightly in the time domain (usually at a rate of 24 or 30 frames/second). This technique is identical to how the illusion of movement is achieved with television and motion pictures.
Computer animation is essentially a digital successor to the art of stop motion animation of 3D models and frame-by-frame animation of 2D illustrations. For 3D animations, objects (models) are built on the computer monitor (modeled) and 3D figures are rigged with a virtual skeleton. For 2D figure animations, separate objects (illustrations) and separate transparent layers are used, with or without a virtual skeleton. Then the limbs, eyes, mouth, clothes, etc. of the figure are moved by the animator on key frames. The differences in appearance between key frames are automatically calculated by the computer in a process known as tweening or morphing. Finally, the animation is rendered.
For 3D animations, all frames must be rendered after modeling is complete. For 2D vector animations, the rendering process is the key frame illustration process, while tweened frames are rendered as needed. For pre-recorded presentations, the rendered frames are transferred to a different format or medium such as film or digital video. The frames may also be rendered in real time as they are presented to the end-user audience. Low bandwidth animations transmitted via the internet (e.g. 2D Flash, X3D) often use software on the end-users computer to render in real time as an alternative to streaming or pre-loaded high bandwidth animations.
To create the illusion of movement, an image is displayed on the computer, screen and repeatedly replaced by a new image that is similar to the previous image, but advanced slightly in the time domain (usually at a rate of 24 or 30 frames/second). This technique is identical to how the illusion of movement is achieved with television and motion pictures.
Computer animation is essentially a digital successor to the art of stop motion animation of 3D models and frame-by-frame animation of 2D illustrations. For 3D animations, objects (models) are built on the computer monitor (modeled) and 3D figures are rigged with a virtual skeleton. For 2D figure animations, separate objects (illustrations) and separate transparent layers are used, with or without a virtual skeleton. Then the limbs, eyes, mouth, clothes, etc. of the figure are moved by the animator on key frames. The differences in appearance between key frames are automatically calculated by the computer in a process known as tweening or morphing. Finally, the animation is rendered.
For 3D animations, all frames must be rendered after modeling is complete. For 2D vector animations, the rendering process is the key frame illustration process, while tweened frames are rendered as needed. For pre-recorded presentations, the rendered frames are transferred to a different format or medium such as film or digital video. The frames may also be rendered in real time as they are presented to the end-user audience. Low bandwidth animations transmitted via the internet (e.g. 2D Flash, X3D) often use software on the end-users computer to render in real time as an alternative to streaming or pre-loaded high bandwidth animations.
RAINWATER HARVESTING
Rainwater harvesting is the gathering, or accumulating and storing, of rainwater.
Traditionally, rainwater harvesting has been practiced in arid and semi-arid areas, and has provided drinking water, domestic water, water for livestock, water for small irrigation and a way to increase ground water levels.
There are many types of systems to harvest rainwater. Notable systems are systems for runoff rainwater (eg hillside run-off) and rooftop rainwater harvesting systems. The type used depends greatly on the purpose (domestic or industrial use) and to some extent also on economics and physical and human considerations. Generally speaking, rooftop rainwater systems are most used as they are most economical (if there is more than 254mm of precipitation a year)To determine the amount of precipitation falling in your area, refer to this map
System types : - At the moment, 2 types of systems are generally used. These include DIY and commercial systems. Both of these systems are known under the term water harvesters and require only a limited amount of knowledge to set up (if basic systems are used). In both cases, the system consists of a storage tank to store the water and piping (to guide the water in). Additionally, extra pressuring equipment as pressure vessels, inline pump controllers or pressure sensitive pumps may also be required. Finally, water purifying equipment as water-purifying plants, UV-lights or distillation equipment are sometimes (depending on local conditions ) added to purify the collected water. The system is then called a Greywater treatment system. Greywater systems are usually preferred over regular water harvesters as they allow the system to not only treat the rainwater, but water from other sources as well (eg the watercloset; if plants are used). However, this feature may also be averted by using a UV-lamp and composting toilet instead.
Depending on local circumstances, a gravity-fed system may already be enough to have a pressured water collection system. In the latter case, no pumps/pressure vessels are thus required to have a pressured system. In practice, gravity-controlled systems are usually created by placing the water harvester on an elevation (eg rooftops).
DIY domestic systems : - As water conservation is becoming more and more popular, more people have begun to make their own homebrew installation. These systems range from traditional technologies like rain barrels to more complex greywater systems. Through the internet, plans and accurate construction information have become available. Depending on the degree of personal skill and preference, a more basic (regular water tank and piping ) -or more advanced (e.g. pressured systems with water treatment, etc.) system is chosen.
Commercial domestic systems : - Commercial systems are also made. They are offered by a variety of companies which include Rain Man & Freerain Ltd, ... Commercial rain harvesters can be obtained in both pressurized as gravity-fed systems . Greywater treatment systems are sold by companies as Water Works UK, Nubian Water Systems, BRAC Systems, ... Again, they are available in pressurised as gravity-fed systems.
System's operation : - A mechanism can be used to send the initial water flow to waste, usually the first few liters. These are commonly known as 'first-flush' diverters, and are used to increase the chance that the large-particle residue that might accumulate on your collection surface is washed away from (and not into) your storage tank. Such a system also compensates for the fact that the initial minutes of a rainfall can include airborne pollutants being washed from the sky , and likewise minimizes contamination of your captured supply. Simple but regular inspection and maintenance of such a device is usually necessary.
Not all catchment systems use such a feature. For example, rainwater in rural areas of Australia is traditionally used without such a system, and without treatment, but this may be unwise in different environments.
Traditionally, rainwater harvesting has been practiced in arid and semi-arid areas, and has provided drinking water, domestic water, water for livestock, water for small irrigation and a way to increase ground water levels.
There are many types of systems to harvest rainwater. Notable systems are systems for runoff rainwater (eg hillside run-off) and rooftop rainwater harvesting systems. The type used depends greatly on the purpose (domestic or industrial use) and to some extent also on economics and physical and human considerations. Generally speaking, rooftop rainwater systems are most used as they are most economical (if there is more than 254mm of precipitation a year)To determine the amount of precipitation falling in your area, refer to this map
System types : - At the moment, 2 types of systems are generally used. These include DIY and commercial systems. Both of these systems are known under the term water harvesters and require only a limited amount of knowledge to set up (if basic systems are used). In both cases, the system consists of a storage tank to store the water and piping (to guide the water in). Additionally, extra pressuring equipment as pressure vessels, inline pump controllers or pressure sensitive pumps may also be required. Finally, water purifying equipment as water-purifying plants, UV-lights or distillation equipment are sometimes (depending on local conditions ) added to purify the collected water. The system is then called a Greywater treatment system. Greywater systems are usually preferred over regular water harvesters as they allow the system to not only treat the rainwater, but water from other sources as well (eg the watercloset; if plants are used). However, this feature may also be averted by using a UV-lamp and composting toilet instead.
Depending on local circumstances, a gravity-fed system may already be enough to have a pressured water collection system. In the latter case, no pumps/pressure vessels are thus required to have a pressured system. In practice, gravity-controlled systems are usually created by placing the water harvester on an elevation (eg rooftops).
DIY domestic systems : - As water conservation is becoming more and more popular, more people have begun to make their own homebrew installation. These systems range from traditional technologies like rain barrels to more complex greywater systems. Through the internet, plans and accurate construction information have become available. Depending on the degree of personal skill and preference, a more basic (regular water tank and piping ) -or more advanced (e.g. pressured systems with water treatment, etc.) system is chosen.
Commercial domestic systems : - Commercial systems are also made. They are offered by a variety of companies which include Rain Man & Freerain Ltd, ... Commercial rain harvesters can be obtained in both pressurized as gravity-fed systems . Greywater treatment systems are sold by companies as Water Works UK, Nubian Water Systems, BRAC Systems, ... Again, they are available in pressurised as gravity-fed systems.
System's operation : - A mechanism can be used to send the initial water flow to waste, usually the first few liters. These are commonly known as 'first-flush' diverters, and are used to increase the chance that the large-particle residue that might accumulate on your collection surface is washed away from (and not into) your storage tank. Such a system also compensates for the fact that the initial minutes of a rainfall can include airborne pollutants being washed from the sky , and likewise minimizes contamination of your captured supply. Simple but regular inspection and maintenance of such a device is usually necessary.
Not all catchment systems use such a feature. For example, rainwater in rural areas of Australia is traditionally used without such a system, and without treatment, but this may be unwise in different environments.
DEFORESTATION
Deforestation is the logging or burning of trees in forested areas.
There are several reasons for doing so: trees or derived charcoal can be sold as a commodity and are used by humans while cleared land is used as pasture, plantations of commodities and human settlement. The removal of trees without sufficient reforestation, has resulted in damage to habitat, biodiversity loss and aridity.
Also deforested regions often degrade into wasteland.
Disregard or unawareness of intrinsic value, and lack of ascribed value, lax forest management and environmental law allow deforestation to occur on such a large scale. In many countries, deforestation is an ongoing issue which is causing extinction, changes to climatic conditions, desertification and displacement of indigenous people.
Causes of anthropogenic deforestation : - In simple terms, deforestation occurs because forested land is not economically viable. Increasing the amount of farmland, woods are used by native populations of over 200 million people worldwide.
The presumed value of forests as a genetic resources has never been confirmed by any economic studies . As a result owners of forested land lose money by not clearing the forest and this affects the welfare of the whole society . From the perspective of the developing world, the benefits of forest as carbon sinks or biodiversity reserves go primarily to richer developed nations and there is insufficient compensation for these services. As a result some countries simply have too much forest. Developing countries feel that some countries in the developed world, such as the United States of America, cut down their forests centuries ago and benefited greatly from this deforestation and that it is hypocritical to deny developing countries the same opportunities: that the poor shouldn’t have to bear the cost of preservation when the rich created the problem .
Aside from a general agreement that deforestation occurs to increase the economic value of the land there is no agreement on what causes deforestation. Logging may be a direct source of deforestation in some areas and have no effect or be at worst an indirect source in others due to logging roads enabling easier access for farmers wanting to clear the forest: experts do not agree on whether logging is an important contributor to global deforestation and some believe that logging makes considerable contribution to reducing deforestation because in developing countries logging reserves are far larger than nature reserves . Similarly there is no consensus on whether poverty is important in deforestation. Some argue that poor people are more likely to clear forest because they have no alternatives, others that the poor lack the ability to pay for the materials and labour needed to clear forest. .
Claims that that population growth drives deforestation is weak and based on flawed data. with population increase due to high fertility rates being a primary driver of tropical deforestation in only 8% of cases . The FAO states that the global deforestation rate is unrelated to human population growth rate, rather it is the result of lack of technological advancement and inefficient governance . There are many causes at the root of deforestation, such as the corruption and inequitable distribution of wealth and power, population growth and overpopulation, and urbanization. Globalization is often viewed as a driver of deforestation.
According to British environmentalist Norman Myers, 5% of deforestation is due to cattle ranching, 19% to over-heavy logging, 22% due to the growing sector of palm oil plantations, and 54% due to slash-and-burn farming.
There are several reasons for doing so: trees or derived charcoal can be sold as a commodity and are used by humans while cleared land is used as pasture, plantations of commodities and human settlement. The removal of trees without sufficient reforestation, has resulted in damage to habitat, biodiversity loss and aridity.
Also deforested regions often degrade into wasteland.
Disregard or unawareness of intrinsic value, and lack of ascribed value, lax forest management and environmental law allow deforestation to occur on such a large scale. In many countries, deforestation is an ongoing issue which is causing extinction, changes to climatic conditions, desertification and displacement of indigenous people.
Causes of anthropogenic deforestation : - In simple terms, deforestation occurs because forested land is not economically viable. Increasing the amount of farmland, woods are used by native populations of over 200 million people worldwide.
The presumed value of forests as a genetic resources has never been confirmed by any economic studies . As a result owners of forested land lose money by not clearing the forest and this affects the welfare of the whole society . From the perspective of the developing world, the benefits of forest as carbon sinks or biodiversity reserves go primarily to richer developed nations and there is insufficient compensation for these services. As a result some countries simply have too much forest. Developing countries feel that some countries in the developed world, such as the United States of America, cut down their forests centuries ago and benefited greatly from this deforestation and that it is hypocritical to deny developing countries the same opportunities: that the poor shouldn’t have to bear the cost of preservation when the rich created the problem .
Aside from a general agreement that deforestation occurs to increase the economic value of the land there is no agreement on what causes deforestation. Logging may be a direct source of deforestation in some areas and have no effect or be at worst an indirect source in others due to logging roads enabling easier access for farmers wanting to clear the forest: experts do not agree on whether logging is an important contributor to global deforestation and some believe that logging makes considerable contribution to reducing deforestation because in developing countries logging reserves are far larger than nature reserves . Similarly there is no consensus on whether poverty is important in deforestation. Some argue that poor people are more likely to clear forest because they have no alternatives, others that the poor lack the ability to pay for the materials and labour needed to clear forest. .
Claims that that population growth drives deforestation is weak and based on flawed data. with population increase due to high fertility rates being a primary driver of tropical deforestation in only 8% of cases . The FAO states that the global deforestation rate is unrelated to human population growth rate, rather it is the result of lack of technological advancement and inefficient governance . There are many causes at the root of deforestation, such as the corruption and inequitable distribution of wealth and power, population growth and overpopulation, and urbanization. Globalization is often viewed as a driver of deforestation.
According to British environmentalist Norman Myers, 5% of deforestation is due to cattle ranching, 19% to over-heavy logging, 22% due to the growing sector of palm oil plantations, and 54% due to slash-and-burn farming.
TERRORISM
Terrorism is, most simply, policy intended to intimidate or cause terror.
It is more commonly understood as an act which (1) is intended to create fear (terror), (2) is perpetrated for an ideological goal (as opposed to a materialistic goal or a lone attack), and (3) deliberately targets (or disregards the safety of) non-combatants. Some definitions also include acts of unlawful violence or unconventional warfare, but at present, there is no internationally agreed upon definition of terrorism.
A person who practices terrorism is a terrorist. Acts of terrorism are criminal acts according to United Nations Security Council Resolution 1373 and the domestic jurisprudence of almost all nations. The word “terrorism” is politically and emotionally charged,and this greatly compounds the difficulty of providing a precise definition. A 1988 study by the United States Army found that over 100 definitions of the word “terrorism” have been used.The concept of terrorism is itself controversial because it is often used by states to delegitimize political or foreign opponents, and potentially legitimize the state's own use of terror against them.
The history of terrorist organizations suggests that they do not practice terrorism only for its political effectiveness; individual terrorists are also motivated by a desire for social solidarity with other members. Terrorism has been practiced by a broad array of political organizations for furthering their objectives. It has been practiced by both right-wing and left-wing political parties, nationalistic groups, religious groups, revolutionaries, and ruling governments.
"Terror" comes from a Latin word meaning "to frighten". The terror cimbricus was a panic and state of emergency in Rome in response to the approach of warriors of the Cimbri tribe in 105BC. The Jacobins cited this precedent when imposing a Reign of Terror during the French Revolution. After the Jacobins lost power, the word "terrorist" became a term of abuse. Although the Reign of Terror was imposed by a government, in modern times "terrorism" usually refers to the killing of innocent people by a private group in such a way as to create a media spectacle. This meaning can be traced back to Sergey Nechayev, who described himself as a "terrorist". Nechayev founded the Russian terrorist group "People's Retribution" (Народная расправа) in 1869.
In November 2004, a United Nations Security Council report described terrorism as any act "intended to cause death or serious bodily harm to civilians or non-combatants with the purpose of intimidating a population or compelling a government or an international organization to do or abstain from doing any act". (Note that this report does not constitute international law).
In many countries, acts of terrorism are legally distinguished from criminal acts done for other purposes, and "terrorism" is defined by statute; see definition of terrorism for particular definitions. Common principles among legal definitions of terrorism provide an emerging consensus as to meaning and also foster cooperation between law enforcement personnel in different countries. Among these definitions there are several that do not recognize the possibility of legitimate use of violence by civilians against an invader in an occupied country and would, thus label all resistance movements as terrorist groups. Others make a distinction between lawful and unlawful use of violence. Ultimately, the distinction is a political judgment.
It is more commonly understood as an act which (1) is intended to create fear (terror), (2) is perpetrated for an ideological goal (as opposed to a materialistic goal or a lone attack), and (3) deliberately targets (or disregards the safety of) non-combatants. Some definitions also include acts of unlawful violence or unconventional warfare, but at present, there is no internationally agreed upon definition of terrorism.
A person who practices terrorism is a terrorist. Acts of terrorism are criminal acts according to United Nations Security Council Resolution 1373 and the domestic jurisprudence of almost all nations. The word “terrorism” is politically and emotionally charged,and this greatly compounds the difficulty of providing a precise definition. A 1988 study by the United States Army found that over 100 definitions of the word “terrorism” have been used.The concept of terrorism is itself controversial because it is often used by states to delegitimize political or foreign opponents, and potentially legitimize the state's own use of terror against them.
The history of terrorist organizations suggests that they do not practice terrorism only for its political effectiveness; individual terrorists are also motivated by a desire for social solidarity with other members. Terrorism has been practiced by a broad array of political organizations for furthering their objectives. It has been practiced by both right-wing and left-wing political parties, nationalistic groups, religious groups, revolutionaries, and ruling governments.
"Terror" comes from a Latin word meaning "to frighten". The terror cimbricus was a panic and state of emergency in Rome in response to the approach of warriors of the Cimbri tribe in 105BC. The Jacobins cited this precedent when imposing a Reign of Terror during the French Revolution. After the Jacobins lost power, the word "terrorist" became a term of abuse. Although the Reign of Terror was imposed by a government, in modern times "terrorism" usually refers to the killing of innocent people by a private group in such a way as to create a media spectacle. This meaning can be traced back to Sergey Nechayev, who described himself as a "terrorist". Nechayev founded the Russian terrorist group "People's Retribution" (Народная расправа) in 1869.
In November 2004, a United Nations Security Council report described terrorism as any act "intended to cause death or serious bodily harm to civilians or non-combatants with the purpose of intimidating a population or compelling a government or an international organization to do or abstain from doing any act". (Note that this report does not constitute international law).
In many countries, acts of terrorism are legally distinguished from criminal acts done for other purposes, and "terrorism" is defined by statute; see definition of terrorism for particular definitions. Common principles among legal definitions of terrorism provide an emerging consensus as to meaning and also foster cooperation between law enforcement personnel in different countries. Among these definitions there are several that do not recognize the possibility of legitimate use of violence by civilians against an invader in an occupied country and would, thus label all resistance movements as terrorist groups. Others make a distinction between lawful and unlawful use of violence. Ultimately, the distinction is a political judgment.
GLOBAL WARMING
Global warming is the increase in the average temperature of the Earth's near-surface air and oceans since the mid-twentieth century and its projected continuation. Global surface temperature increased 0.74 ± 0.18 °C (1.33 ± 0.32 °F) during the last century.The Intergovernmental Panel on Climate Change (IPCC) concludes that anthropogenic greenhouse gases are responsible for most of the observed temperature increase since the middle of the twentieth century, and that natural phenomena such as solar variation and volcanoes probably had a small warming effect from pre-industrial times to 1950 and a small cooling effect afterward. These basic conclusions have been endorsed by more than 40 scientific societies and academies of science, including all of the national academies of science of the major industrialized countries.
Climate model projections summarized in the latest IPCC report indicate that global surface temperature will likely rise a further 1.1 to 6.4 °C (2.0 to 11.5 °F) during the twenty-first century.The uncertainty in this estimate arises from the use of models with differing climate sensitivity, and the use of differing estimates of future greenhouse gas emissions. Some other uncertainties include how warming and related changes will vary from region to region around the globe. Most studies focus on the period up to 2100. However, warming is expected to continue beyond 2100, even if emissions stop, because of the large heat capacity of the oceans and the long lifetime of carbon dioxide in the atmosphere.
Increasing global temperature will cause sea levels to rise and will change the amount and pattern of precipitation, likely including expansion of subtropical deserts. The continuing retreat of glaciers, permafrost and sea ice is expected, with the Arctic region being particularly affected. Other likely effects include shrinkage of the Amazon rainforest and Boreal forests, increases in the intensity of extreme weather events, species extinctions and changes in agricultural yields.
Political and public debate continues regarding the appropriate response to global warming. The available options are mitigation to reduce further emissions; adaptation to reduce the damage caused by warming; and, more speculatively, geoengineering to reverse global warming. Most national governments have signed and ratified the Kyoto Protocol aimed at reducing greenhouse gas emissions.
Climate model projections summarized in the latest IPCC report indicate that global surface temperature will likely rise a further 1.1 to 6.4 °C (2.0 to 11.5 °F) during the twenty-first century.The uncertainty in this estimate arises from the use of models with differing climate sensitivity, and the use of differing estimates of future greenhouse gas emissions. Some other uncertainties include how warming and related changes will vary from region to region around the globe. Most studies focus on the period up to 2100. However, warming is expected to continue beyond 2100, even if emissions stop, because of the large heat capacity of the oceans and the long lifetime of carbon dioxide in the atmosphere.
Increasing global temperature will cause sea levels to rise and will change the amount and pattern of precipitation, likely including expansion of subtropical deserts. The continuing retreat of glaciers, permafrost and sea ice is expected, with the Arctic region being particularly affected. Other likely effects include shrinkage of the Amazon rainforest and Boreal forests, increases in the intensity of extreme weather events, species extinctions and changes in agricultural yields.
Political and public debate continues regarding the appropriate response to global warming. The available options are mitigation to reduce further emissions; adaptation to reduce the damage caused by warming; and, more speculatively, geoengineering to reverse global warming. Most national governments have signed and ratified the Kyoto Protocol aimed at reducing greenhouse gas emissions.
SPACE WEATHER
Space weather is the concept of changing environmental conditions in outer space. It is distinct from the concept of weather within a planetary atmosphere, and deals with phenomena involving ambient plasma, magnetic fields, radiation and other matter in space. "Space weather" often implicitly means the weather in outer space close to the Earth, but it is also studied in interplanetary (and occasionally interstellar space).
Within our own solar system, space weather is greatly influenced by the speed and density of the solar wind and the interplanetary magnetic field (IMF) carried by the solar wind plasma. A variety of physical phenomena are associated with space weather, including geomagnetic storms and substorms, energization of the Van Allen radiation belts, ionospheric disturbances and scintillation, aurora and geomagnetically induced currents at Earth's surface. Coronal Mass Ejections and their associated shock waves are also important drivers of space weather as they can compress the magnetosphere and trigger geomagnetic storms. Solar Energetic Particles, accelerated by coronal mass ejections or solar flares, are also an important driver of space weather as they can damage electronics onboard spacecraft through induced electric currents and threaten the life of astronauts.
Space weather exerts a profound influence in several areas related to space exploration and development. Changing geomagnetic conditions can induce changes in atmospheric density causing the rapid degradation of spacecraft altitude in Low Earth orbit. Geomagnetic storms due to increased solar activity can potentially blind sensors aboard spacecraft, or interfere with on-board electronics. An understanding of space environmental conditions is also important in designing shielding and life support systems for manned spacecraft. There is also some concern that geomagnetic storms may also expose conventional aircraft flying at high latitudes to increased amounts of radiation.
Space weather at the Earth’s surface : - The best known ground-level consequence of space weather is geomagnetically induced currents, or GIC. These are damaging electrical currents that can flow in power grids, pipelines and other conducting networks. Rapid magnetic changes on the ground - that occur during geomagnetic storms and are associated with space weather - can also be important for activities such as geophysical mapping and hydrocarbon production.
Geophysical exploration : - Air and ship borne magnetic surveys can be affected by rapid magnetic field variations during geomagnetic storms. Storms can cause data interpretation problems where the magnetic field changes due to space weather are of similar magnitude to those of the sub-surface crustal magnetic field in the survey area. Accurate geomagnetic storm warnings, including an assessment of the magnitude and duration of the storm, allows for an economic use of survey equipment.
Geophysics and hydrocarbon production : - For economic and other reasons, oil and gas production often involves the directional drilling of well paths many kilometers from a single wellhead in both the horizontal and vertical directions. The accuracy requirements are strict, due to target size – reservoirs may only be a few tens to hundreds of meters across – and for safety reasons, because of the proximity of other boreholes. Surveying by the most accurate gyroscopic method is expensive, since it can involve the cessation of drilling for a number of hours. An alternative is to use a magnetic survey, which enables measurement while drilling (MWD). Near real time magnetic data can be used to correct the drilling direction and nearby magnetic observatories prove vital (Clark and Clarke, 2001; Reay et al, 2006). Magnetic data and storm forecasts can also be helpful in clarifying unknown sources of drilling error on an on-going basis.
Within our own solar system, space weather is greatly influenced by the speed and density of the solar wind and the interplanetary magnetic field (IMF) carried by the solar wind plasma. A variety of physical phenomena are associated with space weather, including geomagnetic storms and substorms, energization of the Van Allen radiation belts, ionospheric disturbances and scintillation, aurora and geomagnetically induced currents at Earth's surface. Coronal Mass Ejections and their associated shock waves are also important drivers of space weather as they can compress the magnetosphere and trigger geomagnetic storms. Solar Energetic Particles, accelerated by coronal mass ejections or solar flares, are also an important driver of space weather as they can damage electronics onboard spacecraft through induced electric currents and threaten the life of astronauts.
Space weather exerts a profound influence in several areas related to space exploration and development. Changing geomagnetic conditions can induce changes in atmospheric density causing the rapid degradation of spacecraft altitude in Low Earth orbit. Geomagnetic storms due to increased solar activity can potentially blind sensors aboard spacecraft, or interfere with on-board electronics. An understanding of space environmental conditions is also important in designing shielding and life support systems for manned spacecraft. There is also some concern that geomagnetic storms may also expose conventional aircraft flying at high latitudes to increased amounts of radiation.
Space weather at the Earth’s surface : - The best known ground-level consequence of space weather is geomagnetically induced currents, or GIC. These are damaging electrical currents that can flow in power grids, pipelines and other conducting networks. Rapid magnetic changes on the ground - that occur during geomagnetic storms and are associated with space weather - can also be important for activities such as geophysical mapping and hydrocarbon production.
Geophysical exploration : - Air and ship borne magnetic surveys can be affected by rapid magnetic field variations during geomagnetic storms. Storms can cause data interpretation problems where the magnetic field changes due to space weather are of similar magnitude to those of the sub-surface crustal magnetic field in the survey area. Accurate geomagnetic storm warnings, including an assessment of the magnitude and duration of the storm, allows for an economic use of survey equipment.
Geophysics and hydrocarbon production : - For economic and other reasons, oil and gas production often involves the directional drilling of well paths many kilometers from a single wellhead in both the horizontal and vertical directions. The accuracy requirements are strict, due to target size – reservoirs may only be a few tens to hundreds of meters across – and for safety reasons, because of the proximity of other boreholes. Surveying by the most accurate gyroscopic method is expensive, since it can involve the cessation of drilling for a number of hours. An alternative is to use a magnetic survey, which enables measurement while drilling (MWD). Near real time magnetic data can be used to correct the drilling direction and nearby magnetic observatories prove vital (Clark and Clarke, 2001; Reay et al, 2006). Magnetic data and storm forecasts can also be helpful in clarifying unknown sources of drilling error on an on-going basis.
THE EARTH'S ATMOSPHERE (OR AIR)
The Earth's atmosphere (or air) is a layer of gases surrounding the planet Earth that is retained by the Earth's gravity. Dry air contains roughly (by volume) 78.08% nitrogen, 20.95% oxygen, 0.93% argon, 0.038% carbon dioxide, and trace amounts of other gases. Air also contains a variable amount of water vapor, on average around 1%. The atmosphere protects life on Earth by absorbing ultraviolet solar radiation, warming the surface through heat retention (greenhouse effect), and reducing temperature extremes between day and night.
There is no definite boundary between the atmosphere and outer space. It slowly becomes thinner and fades into space. An altitude of 120 km (75 mi) marks the boundary where atmospheric effects become noticeable during reentry. The Kármán line, at 100 km (62 mi), is also frequently regarded as the boundary between atmosphere and outer space. Three quarters of the atmosphere's mass is within 11 km (6.8 mi; 36,000 ft) of the surface.
Atmospheric circulation is the large-scale movement of air, and the means (with ocean circulation) by which heat is distributed on the surface of the Earth.
The large-scale structure of the atmospheric circulation varies from year to year, but the basic structure remains fairly constant. However, individual weather systems - midlatitude depressions, or tropical convective cells - occur "randomly". It is accepted that weather cannot be predicted beyond a fairly short limit; perhaps a month in theory, or about ten days in practice (see Chaos theory and Butterfly effect). Nonetheless, the average of these systems (the climate) is stable over longer periods of time
Pressure and thickness : - The average atmospheric pressure, at sea level, is about 1 atmosphere (atm) = 101.3 kPa (kilopascals) = 14.7 psi (pounds per square inch) = 760 torr = 29.9 inches of mercury (symbol Hg). Total atmospheric mass is 5.1480×1018 kg (1.135×1019 lb).
Atmospheric pressure is a direct result of the total weight of the air above the point at which the pressure is measured. Air pressure varies with location and time, because the amount (and weight) of air above the earth varies with location and time. However, the average mass of the air above a square meter of the Earth's surface can be calculated from the total amount of air and the surface area of the Earth. The total air mass is 5148.0 teratonnes and area is 51007.2 megahectares. Thus 5148.0/510.072 = 10.093 tonnes (9.934 LT; 11.126 ST) per square meter or 14.356 pounds per square inch (98.98 kPa). This is about 2.5% below the officially standardized unit atmosphere (1 atm) of 101.325 kPa or 14.696 psi, and corresponds to the mean pressure not at sea level, but at the mean base of the atmosphere as contoured by the Earth's terrain.
Were atmospheric density to remain constant with height the atmosphere would terminate abruptly at 7.81 km (25,600 ft). Instead, density decreases with height, dropping by 50% at an altitude of about 5.6 km (18,000 ft). For comparison the highest mountain, Mount Everest, is higher, at 8.8 km (29,000 ft), so air is less than half as dense at the summit than at sea level. This is why it is so difficult to climb without supplemental oxygen.
This pressure drop is approximately exponential, so that pressure decreases by approximately half every 5.6 km (18,000 ft) and by 63.2% (1 − 1 / e = 1 − 0.368 = 0.632) every 7.64 km (25,100 ft), the average scale height of Earth's atmosphere below 70 km (43 mi; 230,000 ft). However, because of changes in temperature, average molecular weight, and gravity throughout the atmospheric column, the dependence of atmospheric pressure on altitude is modeled by separate equations for each of the layers listed above. Even in the exosphere, the atmosphere is still present. This can be seen by the effects of atmospheric drag on satellites.
In summary, the equations of pressure by altitude in the above references can be used directly to estimate atmospheric thickness. However, the following published data are given for reference:
* 50% of the atmosphere by mass is below an altitude of 5.6 km (18,000 ft).
* 90% of the atmosphere by mass is below an altitude of 16 km (52,000 ft). The common altitude of commercial airliners is about 10 km (33,000 ft) and Mt. Everest's summit is 8,848 m (29,030 ft) above sea level.
* 99.99997% of the atmosphere by mass is below 100 km (62 mi; 330,000 ft), although in the rarefied region above this there are auroras and other atmospheric effects. The highest X-15 plane flight in 1963 reached an altitude of 354,300 ft (108.0 km).
METEOROLOGY
Meteorology (from Greek μετέωρος, metéōros, "high in the sky"; and -λογία, -logia) is the interdisciplinary scientific study of the atmosphere that focuses on weather processes and forecasting (in contrast with climatology). Studies in the field stretch back millennia, though significant progress in meteorology did not occur until the eighteenth century. The nineteenth century saw breakthroughs occur after observing networks developed across several countries. Breakthroughs in weather forecasting were achieved in the latter half of the twentieth century, after the development of the computer.
Meteorological phenomena are observable weather events which illuminate and are explained by the science of meteorology. Those events are bound by the variables that exist in Earth's atmosphere. They are temperature, air pressure, water vapor, and the gradients and interactions of each variable, and how they change in time.
The majority of Earth's observed weather is located in the troposphere. Different spatial scales are studied to determine how systems on local, region, and global levels impact weather and climatology. Meteorology, climatology, atmospheric physics, and atmospheric chemistry are sub-disciplines of the atmospheric sciences. Meteorology and hydrology compose the interdisciplinary field of hydrometeorology. Interactions between Earth's atmosphere and the oceans are part of coupled ocean-atmosphere studies. Meteorology has application in many diverse fields such as the military, energy production, transport, agriculture and construction.
Observation networks and weather forecasting : - The arrival of the electrical telegraph in 1837 afforded, for the first time, a practical method for quickly gathering surface weather observations from a wide area.This data could be used to produce maps of the state of the atmosphere for a region near the Earth's surface and to study how these states evolved through time. To make frequent weather forecasts based on these data required a reliable network of observations, but it was not until 1849 that the Smithsonian Institution began to establish an observation network across the United States under the leadership of Joseph Henry.
Similar observation networks were established in Europe at this time. In 1854, the United Kingdom government appointed Robert FitzRoy to the new office of Meteorological Statist to the Board of Trade with the role of gathering weather observations at sea. FitzRoy's office became the United Kingdom Meteorological Office in 1854, the first national meteorological service in the world. The first daily weather forecasts made by FitzRoy's Office were published in The Times newspaper in 1860. The following year a system was introduced of hoisting storm warning cones at principal ports when a gale was expected.
Over the next 50 years many countries established national meteorological services. The India Meteorological Department (1875) was established following tropical cyclone and monsoon related famines in the previous decades. The Finnish Meteorological Central Office (1881) was formed from part of Magnetic Observatory of Helsinki University. Japan's Tokyo Meteorological Observatory, the forerunner of the Japan Meteorological Agency, began constructing surface weather maps in 1883. The United States Weather Bureau (1890) was established under the United States Department of Agriculture. The Australian Bureau of Meteorology (1906) was established by a Meteorology Act to unify existing state meteorological services.
Meteorological phenomena are observable weather events which illuminate and are explained by the science of meteorology. Those events are bound by the variables that exist in Earth's atmosphere. They are temperature, air pressure, water vapor, and the gradients and interactions of each variable, and how they change in time.
The majority of Earth's observed weather is located in the troposphere. Different spatial scales are studied to determine how systems on local, region, and global levels impact weather and climatology. Meteorology, climatology, atmospheric physics, and atmospheric chemistry are sub-disciplines of the atmospheric sciences. Meteorology and hydrology compose the interdisciplinary field of hydrometeorology. Interactions between Earth's atmosphere and the oceans are part of coupled ocean-atmosphere studies. Meteorology has application in many diverse fields such as the military, energy production, transport, agriculture and construction.
Observation networks and weather forecasting : - The arrival of the electrical telegraph in 1837 afforded, for the first time, a practical method for quickly gathering surface weather observations from a wide area.This data could be used to produce maps of the state of the atmosphere for a region near the Earth's surface and to study how these states evolved through time. To make frequent weather forecasts based on these data required a reliable network of observations, but it was not until 1849 that the Smithsonian Institution began to establish an observation network across the United States under the leadership of Joseph Henry.
Similar observation networks were established in Europe at this time. In 1854, the United Kingdom government appointed Robert FitzRoy to the new office of Meteorological Statist to the Board of Trade with the role of gathering weather observations at sea. FitzRoy's office became the United Kingdom Meteorological Office in 1854, the first national meteorological service in the world. The first daily weather forecasts made by FitzRoy's Office were published in The Times newspaper in 1860. The following year a system was introduced of hoisting storm warning cones at principal ports when a gale was expected.
Over the next 50 years many countries established national meteorological services. The India Meteorological Department (1875) was established following tropical cyclone and monsoon related famines in the previous decades. The Finnish Meteorological Central Office (1881) was formed from part of Magnetic Observatory of Helsinki University. Japan's Tokyo Meteorological Observatory, the forerunner of the Japan Meteorological Agency, began constructing surface weather maps in 1883. The United States Weather Bureau (1890) was established under the United States Department of Agriculture. The Australian Bureau of Meteorology (1906) was established by a Meteorology Act to unify existing state meteorological services.
MINERALOGY
Mineralogy is an Earth Science focused around the chemistry, crystal structure, and physical (including optical) properties of minerals. Specific studies within mineralogy include the processes of mineral origin and formation, classification of minerals, their geographical distribution, as well as their utilization.
Early speculation, study, and theory of mineralogy was written of in ancient Babylonia, the ancient Greco-Roman world, ancient and medieval China, and noted in the prana of Sanskrit texts from ancient India.They included the Naturalis Historia of Pliny the Elder which not only described many different minerals but also explained many of their properties. Systematic scientific studies of minerals and rocks developed in post-Renaissance Europe.The credible study of mineralogy was founded on the principles of crystallography and microscopic study of rock sections with the invention of the microscope in the 17th century.
Modern mineralogy : - Historically, mineralogy was heavily concerned with taxonomy of the rock-forming minerals; to this end, the International Mineralogical Association is an organization whose members represent mineralogists in individual countries. Its activities include managing the naming of minerals (via the Commission of New Minerals and Mineral Names), location of known minerals, etc. As of 2004 there are over 4,000 species of mineral recognized by the IMA. Of these, perhaps 150 can be called "common," another 50 are "occasional," and the rest are "rare" to "extremely rare."
More recently, driven by advances in experimental technique (such as neutron diffraction) and available computational power, the latter of which has enabled extremely accurate atomic-scale simulations of the behaviour of crystals, the science has branched out to consider more general problems in the fields of inorganic chemistry and solid-state physics. It, however, retains a focus on the crystal structures commonly encountered in rock-forming minerals (such as the perovskites, clay minerals and framework silicates).
In particular, the field has made great advances in the understanding of the relationship between the atomic-scale structure of minerals and their function; in nature, prominent examples would be accurate measurement and prediction of the elastic properties of minerals, which has led to new insight into seismological behaviour of rocks and depth-related discontinuities in seismograms of the Earth's mantle. To this end, in their focus on the connection between atomic-scale phenomena and macroscopic properties, the mineral sciences (as they are now commonly known) display perhaps more of an overlap with materials science than any other discipline.
Early speculation, study, and theory of mineralogy was written of in ancient Babylonia, the ancient Greco-Roman world, ancient and medieval China, and noted in the prana of Sanskrit texts from ancient India.They included the Naturalis Historia of Pliny the Elder which not only described many different minerals but also explained many of their properties. Systematic scientific studies of minerals and rocks developed in post-Renaissance Europe.The credible study of mineralogy was founded on the principles of crystallography and microscopic study of rock sections with the invention of the microscope in the 17th century.
Modern mineralogy : - Historically, mineralogy was heavily concerned with taxonomy of the rock-forming minerals; to this end, the International Mineralogical Association is an organization whose members represent mineralogists in individual countries. Its activities include managing the naming of minerals (via the Commission of New Minerals and Mineral Names), location of known minerals, etc. As of 2004 there are over 4,000 species of mineral recognized by the IMA. Of these, perhaps 150 can be called "common," another 50 are "occasional," and the rest are "rare" to "extremely rare."
More recently, driven by advances in experimental technique (such as neutron diffraction) and available computational power, the latter of which has enabled extremely accurate atomic-scale simulations of the behaviour of crystals, the science has branched out to consider more general problems in the fields of inorganic chemistry and solid-state physics. It, however, retains a focus on the crystal structures commonly encountered in rock-forming minerals (such as the perovskites, clay minerals and framework silicates).
In particular, the field has made great advances in the understanding of the relationship between the atomic-scale structure of minerals and their function; in nature, prominent examples would be accurate measurement and prediction of the elastic properties of minerals, which has led to new insight into seismological behaviour of rocks and depth-related discontinuities in seismograms of the Earth's mantle. To this end, in their focus on the connection between atomic-scale phenomena and macroscopic properties, the mineral sciences (as they are now commonly known) display perhaps more of an overlap with materials science than any other discipline.
AN IMMUNE SYSTEM
An immune system is a collection of biological processes within an organism that protects against disease by identifying and killing pathogens and tumour cells. It detects a wide variety of agents, from viruses to parasitic worms, and needs to distinguish them from the organism's own healthy cells and tissues in order to function properly. Detection is complicated as pathogens can evolve rapidly, producing adaptations that avoid the immune system and allow the pathogens to successfully infect their hosts.
To survive this challenge, multiple mechanisms evolved that recognize and neutralize pathogens. Even simple unicellular organisms such as bacteria possess enzyme systems that protect against viral infections. Other basic immune mechanisms evolved in ancient eukaryotes and remain in their modern descendants, such as plants, fish, reptiles, and insects. These mechanisms include antimicrobial peptides called defensins, phagocytosis, and the complement system.
Vertebrates such as humans have even more sophisticated defense mechanisms.The immune systems of vertebrates consist of many types of proteins, cells, organs, and tissues, which interact in an elaborate and dynamic network. As part of this more complex immune response, the human immune system adapts over time to recognise specific pathogens more efficiently. This adaptation process is referred to as "adaptive immunity" or "acquired immunity" and creates immunological memory. Immunological memory created from a primary response to a specific pathogen, provides an enhanced response to secondary encounters with that same, specific pathogen. This process of acquired immunity is the basis of vaccination.
Disorders in the immune system can result in disease. Immunodeficiency diseases occur when the immune system is less active than normal, resulting in recurring and life-threatening infections. Immunodeficiency can either be the result of a genetic disease, such as severe combined immunodeficiency, or be produced by pharmaceuticals or an infection, such as the acquired immune deficiency syndrome (AIDS) that is caused by the retrovirus HIV.
In contrast, autoimmune diseases result from a hyperactive immune system attacking normal tissues as if they were foreign organisms. Common autoimmune diseases include rheumatoid arthritis, diabetes mellitus type 1 and lupus erythematosus. Immunology covers the study of all aspects of the immune system which has significant relevance to human health and diseases. Further investigation in this field is expected to play a serious role in promotion of health and treatment of diseases.
To survive this challenge, multiple mechanisms evolved that recognize and neutralize pathogens. Even simple unicellular organisms such as bacteria possess enzyme systems that protect against viral infections. Other basic immune mechanisms evolved in ancient eukaryotes and remain in their modern descendants, such as plants, fish, reptiles, and insects. These mechanisms include antimicrobial peptides called defensins, phagocytosis, and the complement system.
Vertebrates such as humans have even more sophisticated defense mechanisms.The immune systems of vertebrates consist of many types of proteins, cells, organs, and tissues, which interact in an elaborate and dynamic network. As part of this more complex immune response, the human immune system adapts over time to recognise specific pathogens more efficiently. This adaptation process is referred to as "adaptive immunity" or "acquired immunity" and creates immunological memory. Immunological memory created from a primary response to a specific pathogen, provides an enhanced response to secondary encounters with that same, specific pathogen. This process of acquired immunity is the basis of vaccination.
Disorders in the immune system can result in disease. Immunodeficiency diseases occur when the immune system is less active than normal, resulting in recurring and life-threatening infections. Immunodeficiency can either be the result of a genetic disease, such as severe combined immunodeficiency, or be produced by pharmaceuticals or an infection, such as the acquired immune deficiency syndrome (AIDS) that is caused by the retrovirus HIV.
In contrast, autoimmune diseases result from a hyperactive immune system attacking normal tissues as if they were foreign organisms. Common autoimmune diseases include rheumatoid arthritis, diabetes mellitus type 1 and lupus erythematosus. Immunology covers the study of all aspects of the immune system which has significant relevance to human health and diseases. Further investigation in this field is expected to play a serious role in promotion of health and treatment of diseases.
A VACCINE
A vaccine is a biological preparation that establishes or improves immunity to a particular disease. Vaccines can be prophylactic (e.g. to prevent or ameliorate the effects of a future infection by any natural or "wild" pathogen), or therapeutic (e.g. vaccines against cancer are also being investigated; see cancer vaccine).
The term vaccine derives from Edward Jenner's 1796 use of the term cow pox (Latin variolæ vaccinæ, adapted from the Latin vaccīn-us, from vacca cow), which, when administered to humans, provided them protection against smallpox.Types : - Avian flu vaccine development by reverse genetics techniques. Vaccines may be dead or inactivated organisms or purified products derived from them. There are several types of vaccines currently in use.These represent different strategies used to try to reduce risk of illness, while retaining the ability to induce a beneficial immune response.
Developing immunity : - The immune system recognizes vaccine agents as foreign, destroys them, and 'remembers' them. When the virulent version of an agent comes along the body recognises the protein coat on the virus, and thus is prepared to respond, by (1) neutralizing the target agent before it can enter cells, and (2) by recognizing and destroying infected cells before that agent can multiply to vast numbers.
When two or more vaccines are mixed together in the same formulation, the two vaccines can interfere. This most frequently occurs with live attenuated vaccines, where one of the vaccine components is more robust than the others and suppresses the growth and immune response to the other components. This phenomenon was first noted in the trivalent Sabin polio vaccine, where the amount of serotype 2 virus in the vaccine had to be reduced to stop it from interfering with the "take" of the serotype 1 and 2 viruses in the vaccine. This phenomenon has also been found to be a problem with the dengue vaccines currently being researched, where the DEN-3 serotype was found to predominate and suppress the response to DEN-1, -2 and -4 serotypes.
Vaccines have contributed to the eradication of smallpox, one of the most contagious and deadly diseases known to man. Other diseases such as rubella, polio, measles, mumps, chickenpox, and typhoid are nowhere near as common as they were a hundred years ago. As long as the vast majority of people are vaccinated, it is much more difficult for an outbreak of disease to occur, let alone spread. This effect is called herd immunity. Polio, which is transmitted only between humans, is targeted by an extensive eradication campaign that has seen endemic polio restricted to only parts of four countries. The difficulty of reaching all children as well as cultural misunderstandings, however, have caused the anticipated eradication date to be missed several times.
The term vaccine derives from Edward Jenner's 1796 use of the term cow pox (Latin variolæ vaccinæ, adapted from the Latin vaccīn-us, from vacca cow), which, when administered to humans, provided them protection against smallpox.Types : - Avian flu vaccine development by reverse genetics techniques. Vaccines may be dead or inactivated organisms or purified products derived from them. There are several types of vaccines currently in use.These represent different strategies used to try to reduce risk of illness, while retaining the ability to induce a beneficial immune response.
Developing immunity : - The immune system recognizes vaccine agents as foreign, destroys them, and 'remembers' them. When the virulent version of an agent comes along the body recognises the protein coat on the virus, and thus is prepared to respond, by (1) neutralizing the target agent before it can enter cells, and (2) by recognizing and destroying infected cells before that agent can multiply to vast numbers.
When two or more vaccines are mixed together in the same formulation, the two vaccines can interfere. This most frequently occurs with live attenuated vaccines, where one of the vaccine components is more robust than the others and suppresses the growth and immune response to the other components. This phenomenon was first noted in the trivalent Sabin polio vaccine, where the amount of serotype 2 virus in the vaccine had to be reduced to stop it from interfering with the "take" of the serotype 1 and 2 viruses in the vaccine. This phenomenon has also been found to be a problem with the dengue vaccines currently being researched, where the DEN-3 serotype was found to predominate and suppress the response to DEN-1, -2 and -4 serotypes.
Vaccines have contributed to the eradication of smallpox, one of the most contagious and deadly diseases known to man. Other diseases such as rubella, polio, measles, mumps, chickenpox, and typhoid are nowhere near as common as they were a hundred years ago. As long as the vast majority of people are vaccinated, it is much more difficult for an outbreak of disease to occur, let alone spread. This effect is called herd immunity. Polio, which is transmitted only between humans, is targeted by an extensive eradication campaign that has seen endemic polio restricted to only parts of four countries. The difficulty of reaching all children as well as cultural misunderstandings, however, have caused the anticipated eradication date to be missed several times.
THE POLAR SATELLITE LAUNCH VEHICLE
The Polar Satellite Launch Vehicle, usually known by its abbreviation PSLV, is an expendable launch system operated by the Indian Space Research Organisation (ISRO). It was developed to allow India to launch its Indian Remote Sensing (IRS) satellites into sun synchronous orbits, a service that was, until the advent of the PSLV, commercially viable only from Russia. PSLV can also launch small size satellites into geostationary transfer orbit (GTO). The reliability and versatility of the PSLV is proven by the fact that it has launched 30 spacecrafts (14 Indian and 16 from other countries) into a variety of orbits so far. In April 2008, it successfully launched 10 satellites in one go, breaking a world record held by Russia.
PSLV is designed and developed at Vikram Sarabhai Space Centre (VSSC), Thiruvananthapuram, Kerala. The inertial systems are developed by ISRO Inertial Systems Unit (IISU) at Thiruvananthapuram. The liquid propulsion stages for the second and fourth stages of PSLV as well as the reaction control systems are developed by the Liquid Propulsion Systems Centre (LPSC), also at Thiruvananthapuram. The solid propellant motors are processed by Satish Dhawan Space Centre SHAR, which also carries out launch operations.
The PSLV has four stages using solid and liquid propulsion systems alternately. The first stage is one of the largest solid-fuel rocket boosters in the world and carries 138 tonnes of Hydroxyl-terminated polybutadiene (HTPB) bound propellant with a diameter of 2.8 m. The motor case is made of maraging steel. The booster develops a maximum thrust of about 4,430 kN. Six strap-on motors, four of which are ignited on the ground, augment the first stage thrust. Each of these solid propellant strap-on motors carries nine tonnes of HTPB propellant and produces 677 kN thrust. Pitch and yaw control of the PSLV during the thrust phase of the solid motor is achieved by injection of an aqueous solution of strontium perchlorate in the nozzle to constitute Secondary Injection Thrust Vector Control System (SITVC). The injection is stored in two cylindrical aluminum tanks strapped to the solid rocket motor and pressurized with nitrogen. SITVC in two strap-on motors is for roll control augmentation.
The second stage employs the Vikas engine and carries 41.5 tonnes (40 tonnes till C-5 mission) of liquid propellant – Unsymmetrical Di-Methyl Hydrazine (UDMH) as fuel and Nitrogen tetroxide (N2O4) as oxidizer. It generates a maximum thrust of 800 kN (724 till C-5 mission). Pitch & yaw control is obtained by hydraulically gimbaled engine (±4°) and two hot gas reaction control for roll.
The third stage uses 7 tonnes of HTPB-based solid propellant and produces a maximum thrust of 324 kN. It has a Kevlar-polyamide fiber case and a submerged nozzle equipped with a flex-bearing-seal gimbaled nozzle (±2°) thrust-vector engine for pitch & yaw control. For roll control it uses the RCS (Reaction Control System) of fourth stage.
The fourth and the terminal stage of PSLV has a twin engine configuration using liquid propellant. With a propellant loading of 2 tonnes (Mono-Methyl Hydrazine as fuel + Mixed Oxides of Nitrogen as oxidiser), each of these engines generates a maximum thrust of 7.4 kN. Engine is gimbaled (±3°) for pitch, yaw & roll control and for control during the coast phase uses on-off RCS. PSLV-C4 used a new lightweight carbon composite payload adapter to enable a greater GTO payload capability.
PSLV is designed and developed at Vikram Sarabhai Space Centre (VSSC), Thiruvananthapuram, Kerala. The inertial systems are developed by ISRO Inertial Systems Unit (IISU) at Thiruvananthapuram. The liquid propulsion stages for the second and fourth stages of PSLV as well as the reaction control systems are developed by the Liquid Propulsion Systems Centre (LPSC), also at Thiruvananthapuram. The solid propellant motors are processed by Satish Dhawan Space Centre SHAR, which also carries out launch operations.
The PSLV has four stages using solid and liquid propulsion systems alternately. The first stage is one of the largest solid-fuel rocket boosters in the world and carries 138 tonnes of Hydroxyl-terminated polybutadiene (HTPB) bound propellant with a diameter of 2.8 m. The motor case is made of maraging steel. The booster develops a maximum thrust of about 4,430 kN. Six strap-on motors, four of which are ignited on the ground, augment the first stage thrust. Each of these solid propellant strap-on motors carries nine tonnes of HTPB propellant and produces 677 kN thrust. Pitch and yaw control of the PSLV during the thrust phase of the solid motor is achieved by injection of an aqueous solution of strontium perchlorate in the nozzle to constitute Secondary Injection Thrust Vector Control System (SITVC). The injection is stored in two cylindrical aluminum tanks strapped to the solid rocket motor and pressurized with nitrogen. SITVC in two strap-on motors is for roll control augmentation.
The second stage employs the Vikas engine and carries 41.5 tonnes (40 tonnes till C-5 mission) of liquid propellant – Unsymmetrical Di-Methyl Hydrazine (UDMH) as fuel and Nitrogen tetroxide (N2O4) as oxidizer. It generates a maximum thrust of 800 kN (724 till C-5 mission). Pitch & yaw control is obtained by hydraulically gimbaled engine (±4°) and two hot gas reaction control for roll.
The third stage uses 7 tonnes of HTPB-based solid propellant and produces a maximum thrust of 324 kN. It has a Kevlar-polyamide fiber case and a submerged nozzle equipped with a flex-bearing-seal gimbaled nozzle (±2°) thrust-vector engine for pitch & yaw control. For roll control it uses the RCS (Reaction Control System) of fourth stage.
The fourth and the terminal stage of PSLV has a twin engine configuration using liquid propellant. With a propellant loading of 2 tonnes (Mono-Methyl Hydrazine as fuel + Mixed Oxides of Nitrogen as oxidiser), each of these engines generates a maximum thrust of 7.4 kN. Engine is gimbaled (±3°) for pitch, yaw & roll control and for control during the coast phase uses on-off RCS. PSLV-C4 used a new lightweight carbon composite payload adapter to enable a greater GTO payload capability.
AN ACADEMY
An academy (Greek) is an institution of higher learning, research, or honorary membership. The name traces back to Plato's school of philosophy, founded approximately 385 BC at Akademia, a sanctuary of Athena, the goddess of wisdom, north of Athens, Greece.
Before the Akademia was a school, and even before Cimon enclosed its precincts with a wall (Plutarch Life of Cimon xiii:7), it contained a sacred grove of olive trees dedicated to Athena, the goddess of wisdom, outside the city walls of ancient Athens (Thucydides ii:34). The archaic name for the site was Hekademia, which by classical times evolved into Akademia and was explained, at least as early as the beginning of the 6th century BC, by linking it to an Athenian hero, a legendary "Akademos". The site of the Academy was sacred to Athena and other immortals.
Plato's immediate successors as "scholarch" of the Academy were Speusippus (347-339 BC), Xenocrates (339-314 BC), Polemon (314-269 BC), Crates (ca. 269-266 BC), and Arcesilaus (ca. 266-240 BC). Later scholarchs include Lacydes of Cyrene, Carneades, Clitomachus, and Philo of Larissa ("the last undisputed head of the Academy").Other notable members of the Academy include Aristotle, Heraclides Ponticus, Eudoxus of Cnidus, Philip of Opus, Crantor, and Antiochus of Ascalon.
Modern use of the term academy : - Because of the tradition of intellectual brilliance associated with this institution, many groups have chosen to use the word "Academy" in their name. In the early 19th century "academy" took the connotations that "gymnasium" was acquiring in German-speaking lands, of school that was less advanced than a college (for which it might prepare students) but considerably more than elementary. Early examples are the prestigious preparatory schools of Phillips Andover Academy, Phillips Exeter Academy and Deerfield Academy. Amherst Academy expanded with time to form Amherst College.
Other national academies include the Académie Française; the Royal Academy and Royal Academy of Music of the United Kingdom; the International Academy of Science; the United States Military Academy at West Point, New York; the United States Naval Academy; United States Air Force Academy; and the Australian Defence Force Academy. In emulation of the military academies, police in the United States are trained in police academies. The Academy of Motion Picture Arts and Sciences presents the annual Academy awards.
Mozart organized public subscription performances of his music in Vienna in the 1780s and 1790s, he called the concerts "academies." This usage in musical terms survives in the concert orchestra Academy of St Martin in the Fields and in the Brixton Academy, a concert hall in Brixton, South London.
Academies proliferated in the 20th century until even a three-week series of lectures and discussions would be termed an "academy." In addition, the generic term "the academy" is sometimes used to refer to all of academia, which is sometimes considered a global successor to the Academy of Athens.
Before the Akademia was a school, and even before Cimon enclosed its precincts with a wall (Plutarch Life of Cimon xiii:7), it contained a sacred grove of olive trees dedicated to Athena, the goddess of wisdom, outside the city walls of ancient Athens (Thucydides ii:34). The archaic name for the site was Hekademia, which by classical times evolved into Akademia and was explained, at least as early as the beginning of the 6th century BC, by linking it to an Athenian hero, a legendary "Akademos". The site of the Academy was sacred to Athena and other immortals.
Plato's immediate successors as "scholarch" of the Academy were Speusippus (347-339 BC), Xenocrates (339-314 BC), Polemon (314-269 BC), Crates (ca. 269-266 BC), and Arcesilaus (ca. 266-240 BC). Later scholarchs include Lacydes of Cyrene, Carneades, Clitomachus, and Philo of Larissa ("the last undisputed head of the Academy").Other notable members of the Academy include Aristotle, Heraclides Ponticus, Eudoxus of Cnidus, Philip of Opus, Crantor, and Antiochus of Ascalon.
Modern use of the term academy : - Because of the tradition of intellectual brilliance associated with this institution, many groups have chosen to use the word "Academy" in their name. In the early 19th century "academy" took the connotations that "gymnasium" was acquiring in German-speaking lands, of school that was less advanced than a college (for which it might prepare students) but considerably more than elementary. Early examples are the prestigious preparatory schools of Phillips Andover Academy, Phillips Exeter Academy and Deerfield Academy. Amherst Academy expanded with time to form Amherst College.
Other national academies include the Académie Française; the Royal Academy and Royal Academy of Music of the United Kingdom; the International Academy of Science; the United States Military Academy at West Point, New York; the United States Naval Academy; United States Air Force Academy; and the Australian Defence Force Academy. In emulation of the military academies, police in the United States are trained in police academies. The Academy of Motion Picture Arts and Sciences presents the annual Academy awards.
Mozart organized public subscription performances of his music in Vienna in the 1780s and 1790s, he called the concerts "academies." This usage in musical terms survives in the concert orchestra Academy of St Martin in the Fields and in the Brixton Academy, a concert hall in Brixton, South London.
Academies proliferated in the 20th century until even a three-week series of lectures and discussions would be termed an "academy." In addition, the generic term "the academy" is sometimes used to refer to all of academia, which is sometimes considered a global successor to the Academy of Athens.
HAIR TRANSPLANTATION
Hair transplantation is a surgical technique that involves moving skin containing hair follicles from one part of the body (the donor site) to bald or balding parts (the recipient site). It is primarily used to treat male pattern baldness, whereby grafts containing hair follicles that are genetically resistant to balding are transplanted to bald scalp. However, it is also used to restore eye lashes, eye brows, beard hair, and to fill in scars caused by accidents and surgery such as face lifts and previous hair transplants. Hair transplantation differs from skin grafting in that grafts contain almost all of the epidermis and dermis surrounding the hair follicle, and many tiny grafts are transplanted rather than a single strip of skin.
Since hair naturally grows in follicles that contain groupings of 1 to 4 hairs, today’s most advanced techniques transplant these naturally occurring 1 – 4 hair "follicular units" in their natural groupings. Thus modern hair transplantation can achieve a natural appearance by mimicking nature hair for hair. This recent hair transplant procedure is called "Follicular Unit Transplantation."
History : - The use of both scalp flaps, in which a band of tissue with its original blood supply is shifted to the bald area, and free grafts dates back to the 19th century. Modern transplant techniques began in Japan in the 1930s , where surgeons used small grafts, and even "follicular unit grafts" to replace damaged areas of eyebrows or lashes. They did not attempt to treat baldness per se. Their efforts did not receive worldwide attention at the time, and the traumas of World War II kept their advances isolated for another two decades.
The modern era of hair transplantation in the western world was ushered in the late 1950s, when New York dermatologist Norman Orentreich began to experiment with free donor grafts to balding areas in patients with male pattern baldness. Previously it had been thought that transplanted hair would thrive no more than the original hair at the "recipient" site. Dr. Orentreich demonstrated that such grafts were "donor dominant," as the new hairs grew and lasted just as they would have at their original home. Today Dr. Orentreich's practice still performs hair transplants.
For the next twenty years, surgeons worked on transplanting smaller grafts, but results were only minimally successful, with 2-4 mm "plugs" leading to a doll's head-like appearance. In the 1980s, Uebel in Brazil popularized using large numbers of small grafts, while in the United States Rassman began using thousands of “micrografts” in a single session.
In the late 1980s, Limmer introduced the use of the stereo-microscope to dissect a single donor strip into small micrografts. In 1995, Bernstein and Rassman published the first paper on "Follicular Unit Transplantation," where hair is transplanted exclusively in naturally occurring groups of 1-4 hairs. With microscopic dissection of donor pieces from an excised portion of scalp, individual follicular units containing but 1-4 hairs could be prepared and individually relocated into needle punctures in the recipient areas. Since the transplanted hair mimics the way hair grows in nature, close to natural results were attainable.
The follicular unit hair transplant procedure has continued to evolve, becoming more refined and minimally invasive as the size of the graft incisions have become smaller. These smaller and less invasive incisions enable surgeons to place a larger number of follicular unit grafts into a given area. With the new "gold standard" of ultra refined follicular unit hair transplantation, over 50 grafts can be placed per square centimeter, when appropriate for the patient.
Surgeons have also devoted more attention to the angle and orientation of the transplanted grafts. The adoption of the “lateral slit” technique in the early 2000s, enabled hair transplant surgeons to orient 2 to 4 hair follicular unit grafts so that they splay out across the scalp's surface. This enabled the transplanted hair to lie better on the scalp and provide better coverage to the bald areas. One disadvantage however, is that lateral incisions also tend to disrupt the scalp's vascularity more than sagitals. Thus sagital incisions transect less hairs and blood vessels assuming the cutting instruments are of the same size. One of the big advantages of sagitals is that they do a much better job of sliding in and around existing hairs to avoid follicle transection. This certainly makes a strong case for physicians who do not require shaving of the recipient area. The lateral incisions bisect existing hairs perpendicular (horizontal) like a T while sagital incisions run parallel (vertical) along side and in between existing hairs. The use of perpendicular (lateral/coronal) slits verses parallel (sagital) slits however, has been heavily debated on patient based hair transplant communities. Many elite hair transplant surgeons typically adopt a combination of both methods depending on what is best for the patient.
Since hair naturally grows in follicles that contain groupings of 1 to 4 hairs, today’s most advanced techniques transplant these naturally occurring 1 – 4 hair "follicular units" in their natural groupings. Thus modern hair transplantation can achieve a natural appearance by mimicking nature hair for hair. This recent hair transplant procedure is called "Follicular Unit Transplantation."
History : - The use of both scalp flaps, in which a band of tissue with its original blood supply is shifted to the bald area, and free grafts dates back to the 19th century. Modern transplant techniques began in Japan in the 1930s , where surgeons used small grafts, and even "follicular unit grafts" to replace damaged areas of eyebrows or lashes. They did not attempt to treat baldness per se. Their efforts did not receive worldwide attention at the time, and the traumas of World War II kept their advances isolated for another two decades.
The modern era of hair transplantation in the western world was ushered in the late 1950s, when New York dermatologist Norman Orentreich began to experiment with free donor grafts to balding areas in patients with male pattern baldness. Previously it had been thought that transplanted hair would thrive no more than the original hair at the "recipient" site. Dr. Orentreich demonstrated that such grafts were "donor dominant," as the new hairs grew and lasted just as they would have at their original home. Today Dr. Orentreich's practice still performs hair transplants.
For the next twenty years, surgeons worked on transplanting smaller grafts, but results were only minimally successful, with 2-4 mm "plugs" leading to a doll's head-like appearance. In the 1980s, Uebel in Brazil popularized using large numbers of small grafts, while in the United States Rassman began using thousands of “micrografts” in a single session.
In the late 1980s, Limmer introduced the use of the stereo-microscope to dissect a single donor strip into small micrografts. In 1995, Bernstein and Rassman published the first paper on "Follicular Unit Transplantation," where hair is transplanted exclusively in naturally occurring groups of 1-4 hairs. With microscopic dissection of donor pieces from an excised portion of scalp, individual follicular units containing but 1-4 hairs could be prepared and individually relocated into needle punctures in the recipient areas. Since the transplanted hair mimics the way hair grows in nature, close to natural results were attainable.
The follicular unit hair transplant procedure has continued to evolve, becoming more refined and minimally invasive as the size of the graft incisions have become smaller. These smaller and less invasive incisions enable surgeons to place a larger number of follicular unit grafts into a given area. With the new "gold standard" of ultra refined follicular unit hair transplantation, over 50 grafts can be placed per square centimeter, when appropriate for the patient.
Surgeons have also devoted more attention to the angle and orientation of the transplanted grafts. The adoption of the “lateral slit” technique in the early 2000s, enabled hair transplant surgeons to orient 2 to 4 hair follicular unit grafts so that they splay out across the scalp's surface. This enabled the transplanted hair to lie better on the scalp and provide better coverage to the bald areas. One disadvantage however, is that lateral incisions also tend to disrupt the scalp's vascularity more than sagitals. Thus sagital incisions transect less hairs and blood vessels assuming the cutting instruments are of the same size. One of the big advantages of sagitals is that they do a much better job of sliding in and around existing hairs to avoid follicle transection. This certainly makes a strong case for physicians who do not require shaving of the recipient area. The lateral incisions bisect existing hairs perpendicular (horizontal) like a T while sagital incisions run parallel (vertical) along side and in between existing hairs. The use of perpendicular (lateral/coronal) slits verses parallel (sagital) slits however, has been heavily debated on patient based hair transplant communities. Many elite hair transplant surgeons typically adopt a combination of both methods depending on what is best for the patient.
LATEX FETISHISM
Latex fetishism is the fetishistic attraction to people wearing latex clothing, or in certain cases, to the garments themselves. rubber fetishism also, as latex is closely-related to rubber (the latter usually being thicker and less shiny, more matte). Latex or rubber fetishists sometimes refer to themselves as "Rubberists". Gay Rubberists tend to call themselves "Rubbermen".
PVC fetishism is closely related to latex fetishism and refers to shiny clothes made of the synthetic plastic polyvinyl chloride (PVC). This is sometimes confused with the similarly-shiny patent leather, which is also a fetish material.
The terms "PVC", "vinyl" and "PU" tend to be used interchangeably by retailers for clothing made from shiny plastic-coated fabrics. These fabrics usually consist of a backing woven from polyester fibers with a surface coating of shiny plastic. The plastic layer itself is typically a blend of PVC and polyurethane (PU), with 100% PVC producing a stiff fabric with a glossy shine and 100% PU producing a stretchy fabric with a silky shine.
A manufacturer's label may say, for example, 67% polyester, 33% polyurethane for a fabric that contains no PVC; or 80% polyvinyl chloride, 20% polyurethane with mention of the polyester backing omitted. To add to the confusion, the plastic layer is often textured to look like leather ("leatherlook", "pleather"), as opposed to smooth ("wetlook", "patent").
One reason why latex, and other tight shiny fabrics may be fetishised is perhaps that the garment forms a "second skin" that acts as a fetishistic surrogate for the wearer's own skin. Thus, wearers of skin-tight latex or PVC garments may be perceived by the viewer as being naked, or simply coated in a shiny substance like paint.
Latex and PVC can also be polished to be shiny and can also be produced in bright colours, adding further visual stimulus to add to the physical sensations produced by the material. The tightness of the garments may also be viewed as a kind of sexual bondage. The smell of latex rubber is also a turn-on for some rubber fetishists, and such garments are usually impregnated with chemicals to enhance the odour. Rubberists also enjoy the idea of exhibitionism and some fantasise about going out in public wearing fetish attire. Some do this, especially in the more liberal areas (Berlin, New York, Montreal, San Francisco, etc).
A compelling reason that people are turned on by wearing rubber is its transformative abilities. As with any costume, a rubberist can imagine themselves having a new identity, especially one that permits a different code of behavio.
PVC fetishism is closely related to latex fetishism and refers to shiny clothes made of the synthetic plastic polyvinyl chloride (PVC). This is sometimes confused with the similarly-shiny patent leather, which is also a fetish material.
The terms "PVC", "vinyl" and "PU" tend to be used interchangeably by retailers for clothing made from shiny plastic-coated fabrics. These fabrics usually consist of a backing woven from polyester fibers with a surface coating of shiny plastic. The plastic layer itself is typically a blend of PVC and polyurethane (PU), with 100% PVC producing a stiff fabric with a glossy shine and 100% PU producing a stretchy fabric with a silky shine.
A manufacturer's label may say, for example, 67% polyester, 33% polyurethane for a fabric that contains no PVC; or 80% polyvinyl chloride, 20% polyurethane with mention of the polyester backing omitted. To add to the confusion, the plastic layer is often textured to look like leather ("leatherlook", "pleather"), as opposed to smooth ("wetlook", "patent").
One reason why latex, and other tight shiny fabrics may be fetishised is perhaps that the garment forms a "second skin" that acts as a fetishistic surrogate for the wearer's own skin. Thus, wearers of skin-tight latex or PVC garments may be perceived by the viewer as being naked, or simply coated in a shiny substance like paint.
Latex and PVC can also be polished to be shiny and can also be produced in bright colours, adding further visual stimulus to add to the physical sensations produced by the material. The tightness of the garments may also be viewed as a kind of sexual bondage. The smell of latex rubber is also a turn-on for some rubber fetishists, and such garments are usually impregnated with chemicals to enhance the odour. Rubberists also enjoy the idea of exhibitionism and some fantasise about going out in public wearing fetish attire. Some do this, especially in the more liberal areas (Berlin, New York, Montreal, San Francisco, etc).
A compelling reason that people are turned on by wearing rubber is its transformative abilities. As with any costume, a rubberist can imagine themselves having a new identity, especially one that permits a different code of behavio.
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