- 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 techniques used to transform massive datasets into a more suitable, or smaller, form for data analysis, while preserving the intrinsic characteristics of the data and minimizing the loss of accuracy. Data reduction is used for scientific computation, statistical analysis, control of industrial processes, and business applications, as well as in data mining. Many data reduction techniques focus on obtaining an approximate representation of the data, others on reducing the size of the original data.
Industry:Science
The observation, measurement, and explanation of human variability in time and space. This includes both biological variability and the study of cultural, or learned, behavior among contemporary human societies. These studies are closely allied with the fields of archeology and linguistics. Studies range from rigorously scientific approaches, such as research into the physiology, demography, and ecology of hunter-gatherers, to more humanistic research on topics such as symbolism and ritual behavior.
Industry:Science
The part of the radio communications system that extracts information from radio-frequency (rf) energy intercepted by the antenna. Radio receivers are the most common electronic equipment worldwide and a vital part of all radio, television, and radar systems. Since the 1960s, radio receiver performance has improved greatly, while size, weight, and cost have fallen dramatically. In the past, radio receivers were built from analog circuits, but increasingly they are realized by digital signal processing.
Industry:Science
The practice of arresting or minimizing artificially accelerated soil deterioration. Its importance has grown because cultivation of soils for agricultural production, deforestation and forest cutting, grazing of natural range, and other disturbances of the natural cover and position of the soil have increased greatly since the middle of the nineteenth century in response to the growth in world population and human technical capacity. Accelerated soil deterioration has been the unfortunate consequence.
Industry:Science
The science of transferring a graft from one part of the body to another or from one individual, the donor, to another, the recipient. The graft may consist of an organ, tissue, or cells. If donor and recipient are the same individual, the graft is autologous. If donor and recipient are genetically identical (monozygotic), it is syngeneic. If donor and recipient are any other same-species individuals, the graft is allogeneic. If the donor and recipient are of different species, it is called xenogeneic.
Industry:Science
The property whereby a solid material changes its shape and size under the action of opposing forces, but recovers its original configuration when the forces are removed. The theory of elasticity deals with the relations between the forces acting on a body and the resulting changes in configuration, and is important in many branches of science and technology, for instance, in the design of structures, in the theory of vibration and sound, and in the study of the forces between atoms in crystal lattices.
Industry:Science
The separation of petroleum into fractions and the treating of these fractions to yield marketable products. Petroleum is a mixture of gaseous, liquid, and solid hydrocarbon compounds that occurs in sedimentary rock deposits throughout the world. In the crude state, petroleum has little value but, when refined, it provides liquid fuels (gasoline, diesel fuel, aviation fuel), solvents, heating oil, lubricants, and the distillation residuum asphalt, which is used for highway surfaces and roofing materials.
Industry:Science
The seed of the tagua palm (<i>Phytelephas macrocarpa</i>) of tropical America. Each drupelike fruit contains six to nine bony seeds. The extremely hard endosperm of the seed is used as a substitute for ivory. Vegetable ivory can be carved and tooled to make buttons, chess pieces, knobs, inlays, and various ornamental articles. The hard, white seeds (coquilla nuts) of the Brazilian palm (<i>Attalea funifera</i>) are often used as a substitute for vegetable ivory in making the same or similar articles.
Industry:Science
The means for guiding and controlling aircraft from an initial approach altitude to a point where safe contact is made with the landing surface. Such systems differ from low-approach systems in three major respects: (1) They furnish not only guidance but control of the aircraft as well. (2) They furnish information on the aircraft's position with respect to the terrain, and the rate at which the landing surface is being approached. (3) They do not require the pilot to assume manual control near the ground.
Industry:Science
The study of ecological interactions mediated by the chemicals that organisms produce. These substances, known as allelochemicals, serve a variety of functions, the growing list of which reflects the rapid discoveries made in this discipline. These compounds influence or regulate interspecific and intraspecific interactions of microorganisms, plants, and animals, and operate within and between all trophic levels—producers, consumers, and decomposers—and in terrestrial, fresh-water, and marine ecosystems.
Industry:Science
