- 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 human mammary gland, usually well developed in the adult female but rudimentary in the male. Each adult female breast contains 15–20 separate, branching glands that radiate from the nipple. During lactation their secretions are discharged through separate openings at the base of the nipple.
Industry:Science
Spatial hearing is concerned with two aspects of sound perception: localization of emitted sound and echolocation, which is the sensing of the environment by means of reflected sound. This article discusses the first aspect, which has been the focus of most spatial hearing research involving humans.
Industry:Science
The enhancement of the thermionic emission of a conductor resulting from an electric field at the conductor surface. Since the thermionic emission current is given by the Richardson formula, an increase in the current at a given temperature implies a reduction in the work function φ of the emitter.
Industry:Science
The generation of heat by electric conductors carrying current. The degree of heating for a given current is proportional to the electrical resistance of the conductor. If the resistance is high, a large amount of heat is generated, and the material is used as a resistor rather than as a conductor.
Industry:Science
The largest and most important class of the division Pinophyta (Gymnospermae), the other classes being Ginkgoopsida and Cycadopsida. There are two orders: the Cordaitanthales, with three extinct families, and the Pinales (Coniferales), with six extinct families and seven families with some extant genera.
Industry:Science
The complex, disseminated organic matter present in sedimentary rocks that remains undissolved by sequential treatment with common organic solvents (such as a benzene-methanol mixture, toluene, and methylene chloride) followed by treatment with nonoxidizing mineral hydrochloric acid and hydrofluoric acid.
Industry:Science
The largest planet in the solar system, and the fifth in the order of distance from the Sun. It is visible to the unaided eye except for short periods when in near conjunction with the Sun. Usually it is the second brightest planet in the sky; only Mars at its maximum luminosity and Venus appear brighter.
Industry:Science
Systems that maintain proper audio signal levels in applications such as sound recording, public address systems, and broadcasting. Two types of electronic devices, compressors and limiters, perform this operation automatically without the need for human intervention, but differ in the way that they perform.
Industry:Science
The branch of meteorological science that uses meteorological sensing elements on satellites to define the past and present state of the atmosphere. Meteorological satellites can measure a wide spectrum of electromagnetic radiation in real time, providing the meteorologist with a supplemental source of data.
Industry:Science
The hemihydrate of calcium sulfate, composition CaSO<sub>4</sub>·½H<sub>2</sub>O, made by calcining the mineral gypsum, composition CaSO<sub>4</sub>·2H<sub>2</sub>O, at temperatures up to 482°F (250°C). It is used for making plasters, molds, and models. For a description of the casting method of ceramic forming
Industry:Science
