- 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.
The forcing of solid metal through a suitably shaped orifice under compressive forces. Extrusion is somewhat analogous to squeezing toothpaste through a tube, although some cold extrusion processes more nearly resemble forging, which also deforms metals by application of compressive forces. Most metals can be extruded, although the process may not be economically feasible for high-strength alloys.
Industry:Science
The largest asteroid in the “main belt” of asteroids between Mars and Jupiter, and the first such object to be discovered.
Industry:Science
The fourth period of the Paleozoic Era, encompassing an interval of geologic time between 418 and 362 million years before present based on radiometric data. The Devonian System encompasses all sedimentary rocks deposited, and all igneous and metamorphic rocks formed, during the Devonian Period. It is conventional that recognition of Devonian time is determined by the definition of Devonian rocks.
Industry:Science
The largest member of the family Mustelidae, to which weasels, mink, fishers, martens, ferrets, badgers, and otters belong.
Industry:Science
The biomedical technology and science of recording the minute electric currents produced by the brains of human beings and other animals. Electroencephalography (EEG) was discovered by Hans Berger in the late 1920s, and was found to have important clinical significance for the diagnosis of brain disease. The interpretation of EEG records has become a clinical specialty for neurological diagnosis.
Industry:Science
The escape of blood from within the vascular system. Hemorrhage may result from either trauma or disease of the vessel wall.
Industry:Science
The first section of this article discusses use of satellite pictures to detect subtle changes in color reflected by the ocean, due to phytoplankton concentration. Studies based on these color changes are used to determine ocean productivity. The second section discusses underwater laser line scan systems and obtaining of high-quality, panoramic images of submerged objects at extended viewing ranges.
Industry:Science
The largest and most varied class in the phylum Mollusca, possibly numbering over 74,000 species and commonly known as snails.
Industry:Science
The chemistry of the sulfides is rather simple inasmuch as most sulfide minerals involve only two major elements, although some involve three, and a few four. Understanding of the phase relations among these minerals is important both to the geologist, whose task it is to locate and exploit ore deposits, and to the metallurgist, whose task it is to extract the metals from the ores for industrial use.
Industry:Science
The establishment of an operating point on the transistor volt-ampere characteristics by means of direct voltages and currents.
Industry:Science
