- 行业: Printing & publishing
- Number of terms: 178089
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- Company Profile:
McGraw Hill Financial, Inc. is an American publicly traded corporation headquartered in Rockefeller Center in New York City. Its primary areas of business are financial, publishing, and business services.
In the petroleum industry, a process for converting nondistillable fractions (residua) of crude oil to lower-boiling-point products and coke. Coking is often used in preference to catalytic cracking because of the presence of metals and nitrogen components that poison catalysts. There are various coking processes: delayed coking, fluid coking, and flexicoking as well as several others.
Industry:Science
Most knowledge of past environments has come from the study of the physical, chemical, and biological remains found in the stratigraphic record. The modern environment also plays a key role in the interpretation of such remains. For this reason, the reconstruction of past environments has its foundations in the principle of uniformitarianism and the application of analogical reasoning.
Industry:Science
No other air vehicle design space has presented as great a mix of challenges as have miniature flight platforms. Creators of these small crewless or “unmanned” aerial vehicles (UAVs) must address the same physical design constraints that have already been mastered by living airborne organisms, including low-Reynolds-number aerodynamics, high energy density, and extreme miniaturization.
Industry:Science
Products derived from the seeds of the tropical tree <i>Theobroma cacao</i>, which grows within a narrow belt along both sides of the Equator. There are three basic varieties: Criollo, which was native to Central and South America; Forastero, which constitutes the bulk of the world supply and is mostly cultivated in West Africa and Brazil; and Trinitario, consisting of various hybrids.
Industry:Science
Polyols or, as they are sometimes called, polyhydric alcohols, are compounds containing more than one hydroxyl group (–OH). Each hydroxyl is attached to separate carbon atoms of an aliphatic skeleton. This group includes glycols, glycerol, and pentaerythritol and also such products as trimethylolethane, trimethylolpropane, 1,2,6-hexanetriol, sorbitol, inositol, and poly(vinyl alcohol).
Industry:Science
In the stratigraphic sequence of the Earth's crust, a surface of erosion that cuts the underlying rocks and is overlain by sedimentary strata. The unconformity represents an interval of geologic time, called the hiatus, during which no deposition occurred and erosion removed preexisting rock. The result is a gap, in some cases encompassing millions of years, in the stratigraphic record.
Industry:Science
One of three naturally occurring mineral forms of calcium carbonate (CaCO<sub>3</sub>). The other forms (or polymorphs) are the abundant mineral calcite and the relatively rare mineral vaterite. Still other forms of calcium carbonate are known, but only as products of laboratory experiments. The name aragonite comes from Aragon, a province in Spain where especially fine specimens occur.
Industry:Science
Metal ions are essential nutrients involved in diverse biological and biochemical processes. These processes include respiration, photosynthesis, muscle contraction, cell division, and biomineralization. Metal ions are key components in electrolytes, cellular compartments, and bones. A very large percentage of proteins and nucleic acids (DNA and RNA) require metal ions to function properly.
Industry:Science
Plant-based foods, such as fruit, vegetables, and whole grains, which contain significant amounts of bioactive phytochemicals and have potent antioxidant activity, may provide desirable health benefits beyond basic nutrition and reduce the risk of developing chronic diseases. The beneficial effects associated with plant-based food consumption are in part due to the existence of phytochemicals.
Industry:Science
In the early 1990s there was a surge of public concern that human activities producing high levels of underwater noise could seriously affect marine animals, especially whales. Although this concern had been identified in the early 1970s and some research had been started in the early 1980s, negative publicity on acoustic programs in oceanography and the military focused attention on the issue.
Industry:Science
