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Solar Still
A solar still distills water with substances dissolved in it by using the heat of the Sun to evaporate water so that it may be cooled and collected, thereby purifying it. They are used in areas where drinking water is unavailable, so that clean water is obtained from dirty water or from plants by exposing them to sunlight. Still types include large scale concentrated solar stills and condensation traps. In a solar still, impure water is contained outside the collector, where it is evaporated by sunlight shining through a transparent collector. The pure water vapour condenses on the cool inside surface and drips into a tank. Distillation replicates the way nature makes rain. The sun's energy heats water to the point of evaporation. As the water evaporates, its vapour rises, condensing into water again as it cools. This process leaves behind impurities, such as salts and heavy metals, and eliminates microbiological organisms. The end result is pure (potable) water. History ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transpiration
Transpiration is the process of water movement through a plant and its evaporation from aerial parts, such as leaves, stems and flowers. Water is necessary for plants but only a small amount of water taken up by the roots is used for growth and metabolism. The remaining 97–99.5% is lost by transpiration and guttation. Leaf surfaces are dotted with pores called stomata (singular "stoma"), and in most plants they are more numerous on the undersides of the foliage. The stomata are bordered by guard cells and their stomatal accessory cells (together known as stomatal complex) that open and close the pore. Transpiration occurs through the stomatal apertures, and can be thought of as a necessary "cost" associated with the opening of the stomata to allow the diffusion of carbon dioxide gas from the air for photosynthesis. Transpiration also cools plants, changes osmotic pressure of cells, and enables mass flow of mineral nutrients and water from roots to shoots. Two major fa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solar Water Disinfection
Solar water disinfection, in short SODIS, is a type of portable water purification that uses solar energy to make biologically-contaminated (e.g. bacteria, viruses, protozoa and worms) water safe to drink. Water contaminated with non-biological agents such as toxic chemicals or heavy metals require additional steps to make the water safe to drink. Solar water disinfection is usually accomplished using some mix of electricity generated by photovoltaics panels (solar PV), heat (solar thermal), and solar ultraviolet light collection. Solar disinfection using the effects of electricity generated by photovoltaics typically uses an electric current to deliver electrolytic processes which disinfect water, for example by generating oxidative free radicals which kill pathogens by damaging their chemical structure. A second approach uses stored solar electricity from a battery, and operates at night or at low light levels to power an ultraviolet lamp to perform secondary solar ultraviolet wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solar Cooker
A solar cooker is a device which uses the energy of direct sunlight to heat, cook or pasteurize drink and other food materials. Many solar cookers currently in use are relatively inexpensive, low-tech devices, although some are as powerful or as expensive as traditional stoves, and advanced, large scale solar cookers can cook for hundreds of people. Because they use no fuel and cost nothing to operate, many nonprofit organizations are promoting their use worldwide in order to help reduce fuel costs and air pollution, and to help slow down deforestation and desertification. History In ancient times, the use of solar energy was believed to have existed in civilizations amidst the Greeks, Romans and the Chinese, though not for cooking. The first academic description of the principles of a solar cooker is by the Swiss geologist, meteorologist, physicist, mountaineer, and Alpine explorer Horace-Bénédict de Saussure, in 1767. The principle of cooking meals by sunlight was larg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mária Telkes
Mária Telkes (December 12, 1900 – December 2, 1995) was a Hungarian-American biophysicist and inventor who worked on solar energy technologies. She moved to the United States in 1925 to work as a biophysicist. She became an American citizen in 1937 and started work at the Massachusetts Institute of Technology to create practical uses of solar energy in 1939. During World War II, she developed a solar distillation device, deployed at the end of the war, which saved the lives of downed airmen and torpedoed sailors. Her goal was to create a version for villagers in poor and arid regions. Telkes, often called by colleagues The Sun Queen, is considered one of the founders of solar thermal storage systems. After the war, she became an associate research professor at MIT. In the 1940s she and architect Eleanor Raymond created one of the first solar-heated houses, Dover Sun House, by storing energy each day. In 1953 they created a solar oven for people at various latitudes that could ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Freshwater
Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids. Although the term specifically excludes seawater and brackish water, it does include non- salty mineral-rich waters such as chalybeate springs. Fresh water may encompass frozen and meltwater in ice sheets, ice caps, glaciers, snowfields and icebergs, natural precipitations such as rainfall, snowfall, hail/ sleet and graupel, and surface runoffs that form inland bodies of water such as wetlands, ponds, lakes, rivers, streams, as well as groundwater contained in aquifers, subterranean rivers and lakes. Fresh water is the water resource that is of the most and immediate use to humans. Water is critical to the survival of all living organisms. Many organisms can thrive on salt water, but the great majority of higher plants and most insects, amphibians, reptiles, mammals and birds need fresh water to survive. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Desalination
Desalination is a process that takes away mineral components from saline water. More generally, desalination refers to the removal of salts and minerals from a target substance, as in soil desalination, which is an issue for agriculture. Saltwater (especially sea water) is desalinated to produce water suitable for human consumption or irrigation. The by-product of the desalination process is brine. Desalination is used on many seagoing ships and submarines. Most of the modern interest in desalination is focused on cost-effective provision of fresh water for human use. Along with recycled wastewater, it is one of the few rainfall-independent water resources. Due to its energy consumption, desalinating sea water is generally more costly than fresh water from surface water or groundwater, water recycling and water conservation. However, these alternatives are not always available and depletion of reserves is a critical problem worldwide. Desalination processes are using eith ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Concentrated Solar Still
A concentrated solar still is a system that uses the same quantity of solar heat input (same solar collection area) as a simple solar still but can produce a volume of freshwater that is many times greater. While a simple solar still is a way of distilling water by using the heat of the sun to drive evaporation from a water source and ambient air to cool a condenser film, a concentrated solar still uses a concentrated solar thermal collector to concentrate solar heat and deliver it to a multi-effect evaporation process for distillation, thus increasing the natural rate of evaporation. The concentrated solar still is capable of large-scale water production in areas with plentiful solar energy. Performance The concentrated solar still can produce as much as twenty times more water than the theoretical maximum of a standard solar still and in practice, can produce as much as 30x the volume. A typically 25% efficiency standard solar still (not allowing for any recovery of rejected ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hurricane
A tropical cyclone is a rapidly rotating storm system characterized by a low-pressure center, a closed low-level atmospheric circulation, strong winds, and a spiral arrangement of thunderstorms that produce heavy rain and squalls. Depending on its location and strength, a tropical cyclone is referred to by different names, including hurricane (), typhoon (), tropical storm, cyclonic storm, tropical depression, or simply cyclone. A hurricane is a strong tropical cyclone that occurs in the Atlantic Ocean or northeastern Pacific Ocean, and a typhoon occurs in the northwestern Pacific Ocean. In the Indian Ocean, South Pacific, or (rarely) South Atlantic, comparable storms are referred to simply as "tropical cyclones", and such storms in the Indian Ocean can also be called "severe cyclonic storms". "Tropical" refers to the geographical origin of these systems, which form almost exclusively over tropical seas. "Cyclone" refers to their winds moving in a circle, whirling ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Skyhorse Publishing
Skyhorse Publishing, Inc. is an American independent book publishing company founded in 2006 and headquartered in New York City, with a satellite office in Brattleboro, Vermont. History The current president and publisher is founder Tony Lyons, former president and publisher of Lyons Press until 2004. As noted by '' Publishers Weekly'', "Skyhorse's list will have some similarities to the old Lyons Press, with books on sports, flyfishing, nature and history a central part of Skyhorse's publishing program. The list includes narrative nonfiction, military history, gambling and business titles. In addition, onyLyons intends to bring back 'forgotten classics'." Growth and expansion In 2010, Skyhorse acquired Arcade Publishing with its portfolio of 500 titles, as well as another 300 titles through the acquisition of Allworth Press. Skyhorse also announced the 2011 acquisition of Sports Publishing with its 800 titles, and the launch of a children's and young adult imprint cal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
University Of Texas Press
The University of Texas Press (or UT Press) is a university press that is part of the University of Texas at Austin. Established in 1950, the Press publishes scholarly books and journals in several areas, including Latin American studies, Texana, anthropology, U.S. Latino studies, Native American studies, African American studies, film & media studies, classics and the ancient Near East, Middle East studies, natural history, art, and architecture. The Press also publishes trade books and journals relating to their major subject areas. Journals * '' Asian Music'' * '' Diálogo'' * ''Information & Culture'' * '' Journal of Cinema and Media Studies'' (formerly known as ''Cinema Journal'') * ''Journal of the History of Sexuality'' * '' Journal of Individual Psychology'' * '' Journal of Latin American Geography'' * ''Latin American Music Review'' * '' Studies in Latin American Popular Culture'' * ''Texas Studies in Literature and Language'' * ''The Textile Museum Journal'' * '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Urinate
Urination, also known as micturition, is the release of urine from the urinary bladder through the urethra to the outside of the body. It is the urinary system's form of excretion. It is also known medically as micturition, voiding, uresis, or, rarely, emiction, and known colloquially by various names including peeing, weeing, and pissing. In healthy humans (and many other animals), the process of urination is under voluntary control. In infants, some elderly individuals, and those with neurological injury, urination may occur as a reflex. It is normal for adult humans to urinate up to seven times during the day. In some animals, in addition to expelling waste material, urination can mark territory or express submissiveness. Physiologically, urination involves coordination between the central, autonomic, and somatic nervous systems. Brain centres that regulate urination include the pontine micturition center, periaqueductal gray, and the cerebral cortex. In placental ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
