- 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 ...
(PAHs) These compounds are large ring aromatic hydrocarbons that are molecules containing carbon and hydrogen. It could also be any large ring that consists of five or more cyclic compounds of carbons and any elements that may be bonded to the ring. They usually exist in nature in low amounts. Many times these hydrocarbons exist within the atmosphere in the aerosol phase from combustion processes.
Industry:Chemistry; Weather
(t-butanol) A highly flammable, volatile, colorless liquid which has a camphor-like odor. It is miscible in esters, and aromatic and aliphatic hydrocarbons, and soluble in water. Based on its vapor pressure, tert-butyl alcohol will exist mainly in the vapor phase in the atmosphere. It is most likely to react with the hydroxyl (OH) radical at this state. The reaction products are formaldehyde and acetone. One of MTBE's atmospheric decomposition products is t-butanol.
Industry:Chemistry; Weather
<sup>14</sup>C, an isotope of carbon-12 (<sup>12</sup>C). <sup>14</sup>C contains two more neutrons and is radioactive and used in carbon dating. While carbon-12 is not radioactive, the half life of <sup>14</sup>C is 5730 years. This relatively short half life allows the ratio of carbon-12 to carbon-14 to be used to date objects containing carbon to an age of 50,000 years before present time.
Industry:Chemistry; Weather
1) A corrosive poisonous crystalline acidic compound present in coal tar and wood tar that in dilute solutions is used as a disinfectant and 2) any of various acidic compounds analogous to phenols and regarded as hydroxyl derivatives of aromatic hydrocarbons. When coal and wood are burned for energy, phenols are released into the atmosphere.
Industry:Chemistry; Weather
A broad term that includes any forms of acids that accumulate in the atmosphere, for instance, acid rain, fog, haze. The term can be used to explain the long term effects of these events on the environment as well as the main causes of acid rain, fog or haze. The term functions as a category that any aspect of anthropogenic acid in the environment can be placed.
Industry:Chemistry; Weather
A byproduct from the process of burning finely ground coal in an electric power generating plant. Fly ash composition is mainly spherical glassy silica particles released after the combustion cycle through exhaust gases. It's composed of additional elements that form mostly oxidized compounds that condense when they cool down from the combustion process. In December 2008, 2. 6 million cubic yards of fly ash sludge stored in a large retaining pond at a coal-fired power plant near Kingston, TN was released when a retaining dike failed. The sludge was found to contain arsenic, mercury, cadmium, chromium, thallium, and lead, and these toxic metals were found in the river(s) water in which the sludge spilled. ~New York Times Dec 26, 2008`
Industry:Chemistry; Weather
A change in crystal structure, specifically ice, which leads to stronger and more compact packing with time. This can change the space available for various atmospheric components trapped by the initial precipitation/snow fall. Because of this process, scientists are able to determine historical air temperatures by studying the air pockets within ice structures deep below surface.
Industry:Chemistry; Weather
A chemical also know as Halon-2402 which has the chemical formula C<sub>2</sub>F<sub>4</sub>Br<sub>2</sub>. It is a known ozone depleting chemical and is listed as a Class I ozone depleting chemical in the United States Clean Air Act amendments of 1990. It is commonly used as a fire extinguishing agent. The reason it has so much ozone depleting potential is because it contains bromine, which has many times the ozone depleting potential of chlorine.
Industry:Chemistry; Weather
A chemical reaction associated with energy, or heat that is released into the surroundings.
Industry:Chemistry; Weather
A chemical reaction in which heat is absorbed from the surrounding environment.
Industry:Chemistry; Weather
