- 업종: Education
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Founded in 1879 and named after Texas' greatest hero General Sam Houston, Sam Houston State University is public shcool within the Texas state university system and located in Huntsville, Texas.
It's a multicultural institution that offers 79 bachelorette degree programs, 54 masters and five ...
Also referred to as calcium oxide (CaO), lime, or calx. The physical appearance of CaO is white, caustic, and solid at room temperature. Calcium oxide is simply produced by heating the calcium carbonate (CaCO<sub>3</sub>) at high temperatures (
Industry:Chemistry; Weather
An absolute dating technique which uses the properties of the radioactive half-life of Uranium-238 and Thorium-230. The half-life of uranium-238 is 4. 5 billion years, that is, in that many years half of the original amount is still uranium-238 while the other half has lost nucleons to form a different element which is more stable.
Industry:Chemistry; Weather
An accounting or measurement of specified toxic levels of pollutants in the air. Based on the EPA air quality act, it gives the indicator (number) of different gas phase concentration levels to determine if it is hazardous to be outside or not, that is to breathe the air is a specific region. See alert levels.
Industry:Chemistry; Weather
An air pollution control device using the exhaust system of cars. The converter helps complete combustion of any fuel that was not burned in the engine and reduce the presence of other harmful emission concentrations. The converter changes the unburned hydrocarbons and carbon monoxide in the exhaust into carbon dioxide and water vapor. The converter use chemical catalysis to create this change.
Industry:Chemistry; Weather
An alternative energy source that uses the earth's interior heat as the primary energy source for the generation of electricity. Alternative here refers to different from historical sources of energy, that is, hydrocarbons.
Industry:Chemistry; Weather
An American federal agency formed in 1970 during the Nixon Administration in order to protect human health and the environment. The EPA today focuses on the atmosphere, fresh and ocean waters, and soil quality within the United States.
Industry:Chemistry; Weather
An anomaly in the normal positive atmospheric lapse rate (change of temperature with increasing altitude). This usually refers to a thermal inversion, in which temperature of the atmosphere increases rather than decreases with height.
Industry:Chemistry; Weather
An area containing a low atmospheric pressure system which remains between Greenland and Iceland. IL behavior is directly affected by the North Atlantic Oscillation (NAO). A positive NAO means that there is more pressure on the IL. This increase in pressure of the IL causes a greater amount of cold winds to be compressed in the area; this area is colder than usual and those areas farthest from it are warmer than usual. On the other hand, a negative NAO means that there is less pressure on the IL. Pressure decrease of the IL allows the cold winds to spread further south.
Industry:Chemistry; Weather
An area in the troposphere which is affected by the solar heating, radioactive cooling, and surface friction of the earth. The height of the boundary layer can range anywhere from 100m to 3 km and coincides with the height at which pollutants are mixed. The area immediately above the boundary layer is called the free troposphere.
Industry:Chemistry; Weather
An area located near the equator worldwide, covering seven percent of the earth's surface, characterized by high precipitation, absent or short dry season, high tree and vegetative growth rates, high humidity, high photosynthetic rates and extreme biodiversity. The equatorial rain forests produce much of the oxygen in the Earth's atmosphere and absorbs large quantities of carbon dioxide from the air. (See deforestation. )
Industry:Chemistry; Weather
