- 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.
A mammal with spines or quills in addition to regular hair. The 23 species are classified in the order Rodentia and consist of two families: the Hystricidae, or Old World porcupines (11 species), and the Erethizontidae, or New World porcupines (12 species(<b>see table</b>)). Although traditionally considered to be related, the two families of porcupines may have evolved independently from different, unrelated ancestors. The infraorbital foramen is usually larger than the foramen magnum, and the zygomatic arch is also very large. Members of both families have a dental formula of I 1/1, C 0/0, Pm 1/1, M 3/3 × 2 = 20. Porcupines are herbivorous, terrestrial, and generally nocturnal.
Industry:Science
A mammalian order comprising approximately 90 living species of whales, dolphins, and porpoises and their fossil relatives. Like all other mammals but unlike all fish, cetaceans nurse their young with milk produced by the mother, are endothermic (warm-blooded), breathe air, have a lower jaw that consists of a single bony element (the dentary), and have three small bones (hammer, anvil, and stirrup) subserving sound transmission within the ear.
Industry:Science
A map or a series of maps that is used to depict the evolution and life cycle of atmospheric phenomena at selected times at the surface and in the free atmosphere. Weather maps are used for the analysis and display of in-place observational measurements and computer-generated analysis and forecast fields derived from weather and climate prediction models by research and operational meteorologists, government research laboratories, and commercial firms. Similar analyses derived from sophisticated computer forecast models are displayed in map form for forecast periods of 10–14 days in advance to provide guidance for human weather forecasters.
Industry:Science
A map showing the distribution of air temperature (or sometimes sea surface or soil temperature) over a portion of the Earth's surface, or at some level in the atmosphere. On it, isotherms are lines connecting places of equal temperature. The temperatures thus displayed may all refer to the same instant, may be averages for a day, month, season, or year, or may be the hottest or coldest temperatures reported during some interval.
Industry:Science
A mapping or imaging technique, used to obtain clinically useful information about the structure and functioning of tissues and organs, in which acoustic pulses are emitted from an acoustoelectric transducer, and echoes are received from acoustic impedance discontinuities along the assumed line-of-sight axial propagation path. A number of different modes of operation have emerged, each having areas of usefulness.
Industry:Science
A marine bryozoan order in the class Stenolaemata. It is recorded from scattered localities in the Ordovician through Permian systems of the Paleozoic Era but is found prominently in Devonian strata. The colonies comprise tubular zooecia that commonly encrust brachiopod shells, echinoderm plates and columnals, and the outer surfaces of corals. Although usually encrusting, the colonies sometimes may be erect structures. The initial zooecium is a bulbous ancestrula, which gives rise to a tubular zooecium. Succeeding tubular zooecia bud, one at a time, from the lateral wall of the preceding zooecium. The tubular zooecia have perforated walls, and the distal opening of the zooecium is commonly sealed by a plate (possibly perforate). The zooecial wall apparently consisted of two layers, but it lacks the distinctive laminate structures of the order Trepostomata (Stenolaemata) and shows no additional thickening in the outer parts of the colony.
Industry:Science
A marine instrument used primarily for determining the depth of water by means of an acoustic echo. A pulse of sound sent from the ship is reflected from the sea bottom back to the ship, the interval of time between transmission and reception being proportional to the depth of the water.
Industry:Science
A marine traffic management system, operated by a competent authority, for improving the safety and efficiency of vessel traffic and protecting the environment within designated service areas. A vessel traffic service (VTS) has the ability and the authority to interact with marine traffic and respond to developing traffic situations. It improves order and predictability on the waterway throughout its service area by using surveillance, communications, and standard operating procedures to collect, evaluate, and share information to support professional mariners' navigation decision making. Opportunities for human error are reduced through the provision of traffic information, traffic organization, and navigation-assistance services. Captains, mates, and marine pilots use the delivered vessel traffic services to direct and control the maneuvering of ships, tugs with tows, and passenger ferries.
Industry:Science
A maritime habitat characterized by grasses, sedges, and other plants that have adapted to continual, periodic flooding. Salt marshes are found primarily throughout the temperate and subarctic regions.
Industry:Science
A massive body producing distorted, magnified, or multiple images of more distant objects when its gravitational fields bend the paths of light rays. Lenses have been observed when the light from very distant quasars is affected by intervening galaxies and clusters of galaxies, producing several different images of the same quasar. A. Einstein predicted the occurrence of this phenomenon in 1936, but the discovery of real gravitational lenses did not occur until 1979. Gravitational lenses, in addition to being intrinsically interesting, can reveal the intrinsic properties of galaxies, active galaxies, and quasars, and provide information on the universe and its contents, including dark matter.
Industry:Science
