- 行业: Printing & publishing
- Number of terms: 178089
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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 name of two species of reptiles which form the family Gaviidae in the order Crocodilia. The Indian gavial (<i>Gavialis gangeticus</i>) is confined to the Ganges River and its tributaries and may attain a length of 30 ft (9 m), while the Malayan gavial (<i>Tomistoma schlegeli</i>) is found in Borneo and Sumatra and has a maximum length of about 15 ft (4.5 m).
Industry:Science
The process of determining the performance parameters of an artifact, instrument, or system by comparing its performance with measurement standards. Adjustment may be part of calibration but not necessarily. It is essential that there be an unbroken traceability chain between the measurement standards being used and the appropriate national measurement standards.
Industry:Science
The science of detection and measurement of the effects of drugs or other chemicals on biological systems. The effect of chemicals may be beneficial (therapeutic) or harmful (toxic) when administered to humans, other mammals, or other living systems. The pure chemicals or mixtures may be of natural origin (plant, animal, or mineral) or may be synthetic compounds.
Industry:Science
The process of anoxic tissue death. The usual cause is occlusion of an artery by a thrombus or embolus and sometimes by severe atherosclerosis. The development of the infarct depends to a great extent on the collateral circulation. If the collateral blood supply is inadequate or if the vessel is the sole source of blood supply to the region, an infarct results.
Industry:Science
The separation of gas mixtures by thermoacoustic waves is due to a complex cycle of thermal diffusion and viscous motion. This recently discovered process has been described theoretically and demonstrated in experiments which show that the method is well suited for isotope enrichment. The basic phenomena are well understood, and technology development is underway.
Industry:Science
The major alkaloid obtained from the seed capsules, corms, and bulbs of the meadow saffron (autumn crocus; <i>Colchicum autumnale</i>). Colchicine is a fairly abundant alkaloid in dried corms (0.03–0.08%) and seeds (0.6–0.9%). It has been isolated also from other species of <i>Colchicum</i> and a few related genera, but they are not important sources of alkaloid.
Industry:Science
The process by which the intensity of sound is diminished by the conversion of the energy of the sound wave into heat. The absorption of sound is an important case of sound attenuation. This article will address absorption mechanisms in varying media but will concentrate on absorption in ideal gases (such as air), since these effects are the most commonly observed.
Industry:Science
The process of treating materials so that they will not support combustion. Although cellulosic materials such as paper, fiberboard, textiles, and wood products cannot be treated so that they will not be destroyed by long exposure to fire, they can be treated to retard the spreading of fire and to be self-extinguishing after the igniting condition has been removed.
Industry:Science
The last nonavian (nonbird) dinosaur died 65.5 million years ago, and with it any chance of observing nonavian dinosaur (here, “dinosaur”) behavior in the flesh. Yet, our understanding of dinosaur behavior has increased with the discovery of new dinosaur species, the number of which has nearly doubled since 1990. A few recent, exciting discoveries are reviewed here.
Industry:Science
The second-magnitude star that marks the bend in the handle of the Big Dipper, ζ Ursae Majoris. Mizar was the first telescopic visual binary to be discovered (1650), the first ever to be photographed (1857), and the first star discovered to be a spectroscopic binary (1889). Its distance to the Sun is 24 parsecs (7.5 × 10<sup>14</sup> km or 4.7 × 10<sup>14</sup> mi).
Industry:Science
