- 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 hissing, crackling, or other sudden sharp noise that tends to interfere with the reception, utilization, or enjoyment of desired signals or sounds. Perhaps the commonest form of static is that heard in ordinary broadcast receivers during electrical storms. Interference in radio receivers caused by improperly operating electric devices in the vicinity is sometimes also called static.
Industry:Science
A hoisting machine consisting usually of a vertical mast, a slanted boom, and associated tackle (see <b>illus</b>.). Derricks have a wide variety of forms. The mast may be no more than a base for the boom; it may be a tripod, an A-frame, a fixed column, and so on. Fixed stays may guy it in place. The boom may be fixed, it may pivot at the base of the mast, it may swing horizontally from near the top of the mast, or it may be omitted. The derrick may be permanently fixed, temporarily erected, or mobile on a cart or truck.
Industry:Science
A hollow metallic cylinder closed at one end and flared at the other. A bell is used as a fixed-pitch musical instrument or a signaling device, frequently in clocks. A bell is set vibrating by a clapper or tongue which strikes the lip. The bell has two tones, the strike note or key, and the hum tone, which is a major sixth below the strike note. Both tones are rich in harmonics.
Industry:Science
A hollow muscular organ, present in humans and most vertebrates, which receives dilute bile from the liver, concentrates it, and discharges it into the duodenum. It also participates in the entero-hepatic (re)circulation of bile, and in secretion and removal of conjugated xenobiotics, including radiopaque substances taken orally or intravenously. Although not a vital organ, it stores bile, regulates biliary tract pressures, and, when diseased, enhances precipitation of various constituents of the bile as gallstones.
Industry:Science
A hollow, pure carbon molecule in which the atoms lie at the vertices of a polyhedron with 12 pentagonal faces and any number (other than one) of hexagonal faces. The fullerenes were discovered as a consequence of astrophysically motivated chemical physics experiments that were interpreted by using geodesic architectural concepts. Fullerene chemistry, a field that appears to hold much promise for materials development and other applied areas, was born from pure fundamental science.
Industry:Science
A homogeneous mixture of two or more components whose properties vary continuously with varying proportions of the components. A liquid solution can be distinguished experimentally from a pure liquid by the fact that during transfers into other single phases at equilibrium (freezing and vaporizing at constant pressure) the temperature and other properties vary continuously, whereas those of a pure liquid remain constant. For an apparent exception
Industry:Science
A homologous series of magnesium nesosilicate minerals having the general composition Mg<sub>2<i>n</i> + 1</sub>(SiO<sub>4</sub>)<sub><i>n</i></sub>(F,OH)<sub>2</sub>. The known species include norbergite (<i>n</i> = 1), chondrodite (<i>n</i> = 2), humite (<i>n</i> = 3), and clinohumite (<i>n</i> = 4). They are structurally related to forsterite olivine, Mg<sub>2</sub>SiO<sub>4</sub>, and brucite, Mg(OH)<sub>2</sub>. All are based on hexagonal close-packed oxygen and fluorine atoms, the Mg atoms occupying octahedral interstices and the Si atoms occupying tetrahedral interstices. The hexagonal close-packed repeat distance is approximately 0.47 nm in these minerals. Forsterite, norbergite, and humite are orthorhombic; chondrodite and clinohumite are monoclinic; brucite is trigonal. Manganese analogs of these minerals occur as pink grains in metamorphosed manganese ores derived from preexisting siliceous carbonates and sedimentary manganese oxides. Other cations which can occur as substituents are Fe<sup>2+</sup>, Ca<sup>2+</sup>, Al<sup>3+</sup>, and Ti<sup>4+</sup>. Titanoclinohumite, for example, a high-pressure phase, has been found in deep-seated rocks. It may be one of the storage minerals for water at depth.
Industry:Science
A honeybee colony comprising some 25,000 individuals must collect sufficient nectar and pollen to keep its members alive and warm through the winter. An individual load is only about 40 mg, yet in one year a colony harvests about 80 kg of nectar and 20 kg of pollen. A colony gathers forage over an area that can extend more than 10 km in all directions from the hive. The locations of profitable flower patches within this area shift from day to day, and the colony can track and exploit these fluctuating resources. The ability to perform this feat involves both social and individual intelligence.
Industry:Science
A horizontal, inclined, declined, or vertical machine for moving or transporting bulk materials, packages, or objects in a path predetermined by the design of the device and having points of loading and discharge fixed or selective. Included in this category are skip hoist and vertical reciprocating and inclined reciprocating conveyors; but in the strictest sense this category does not include those devices known as industrial trucks, tractors and trailers, cranes, hoists, monorail cranes, power and hand shovels or scoops, bucket drag lines, platform elevators, or highway or rail vehicles. The more usual basic types of conveyors and their normal, rather than exceptional, operating characteristics are shown in the <b>table</b>.
Industry:Science
A horseshoe-shaped bay, approximately 1050 km (650 mi) wide and 1370 km (850 mi) long, stretching from the Canadian provinces of Quebec and Ontario in the south to the Northwest Territories. With a surface area of approximately 827,000 km<sup>2</sup> (320,000 mi<sup>2</sup>), Hudson Bay ranks twelfth in surface area among the Earth's seas and oceans. The bay is connected to the Arctic Ocean by the Foxe Channel and Roes Welcome Sound and to the Atlantic Ocean by the Hudson Strait (see <b>illus.</b>). Several islands are located within the bay, the largest of which is Southampton (41,212 km<sup>2</sup>; 15,912 mi<sup>2</sup>).
Industry:Science
