- 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 ...
An aromatic hydrocarbon used as a common industrial solvent, also named dimethylbenzene; exists as 3 isomers: m-xylene, o-xylene, and p-xylene. Xylene is usually obtained from petroleum and natural gas distillates. It is used in paint, rubber and leather industries, and also as a cleaning agent or degreaser.
Industry:Chemistry; Weather
An atmospheric aerosol of sufficient concentration to be visible. The particles are so small that they cannot be seen individually but are still effective in visual range restriction. The Blue Ridge Mountains of the Eastern United States have a haze caused by the natural emissions of hydrocarbons (mostly isoprene-see below) which are oxidized and form aerosols.
Industry:Chemistry; Weather
An atmospheric modeling technique in which a concentration or another unknown can be calculated relative to certain parameters, such as altitude or temperature.
Industry:Chemistry; Weather
An epoch in Earth history from about 2-5 million years to 10,000 years ago. Also refers to the rocks and sediment deposited in that epoch.
Industry:Chemistry; Weather
An hypothesis proposed during the early 1970s by James Lovelock which states that all living organisms have the ability to affect their surroundings such as the atmosphere, lithosphere, and climate to maximize its biological success. The hypothesis connects the evolution and survival of a species to the evolution and conditions of its environment.
Industry:Chemistry; Weather
An instrument that measures the total ozone in a vertical column of atmosphere. Measurements are made by comparing the amount of back scattered ultraviolet radiation with the amount of incoming solar energy. These changes in this ratio, the earth's albedo, at specific wavelengths can be used to determine the amount of ozone present. Four satellites create global maps daily of the earth's ozone measurements.
Industry:Chemistry; Weather
An international agreement arranged in 1997 in an 11 day conference that took place in Kyoto, Japan. The agreement, coming into force in 2005, required industrialized countries to reduce greenhouse gas emissions, such as carbon dioxide, methane, nitrous oxide, hydrofluorocarbons (HFCs), perflurocarbons (PFCs), and sulfur hexafluoride, by an average of 5% (of 1990 emission levels) by 2008 – 2012. It was ratified by 141 countries including China and India but excluding the U. S. , Australia, and Monaco. While some countries are on target to meet their emission cuts, many signatories will not meet their targets by 2012.
Industry:Chemistry; Weather
An object having the shape of an ellipse: a squashed or elongated circle. The sun follows an elliptic path across the sky.
Industry:Chemistry; Weather
An oil derived hydrocarbon mixture used as fuel in internal combustion engines. In the US more than 40% of carbon dioxide emissions come from transportation engines burning gasoline.
Industry:Chemistry; Weather
An ultraviolet wavelength of light between 280 nm and 320 nm whose intensity is increasing at the earth's surface (probably causing increases in skin cancer), This UV increase is because of decreases in stratospheric ozone.
Industry:Chemistry; Weather
