- 行业: Printing & publishing
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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 extraction of tin from its ores and its subsequent refining and preparation for use. Most tin concentrates are primarily cassiterite (SnO<sub>2</sub>), the naturally occurring oxide of tin. These are comparatively easy to reduce by using carbon at high temperatures. However, this operation differs from the smelting of most common metals because retreatment of the slag is necessary to obtain efficient metal recovery.
Industry:Science
The ability of a radio receiver to separate a desired signal frequency from other signal frequencies, some of which may differ only slightly from the desired value. Selectivity is achieved by using tuned circuits that are sharply peaked and by increasing the number of tuned circuits. With a sharply peaked circuit, the output voltage falls off rapidly for frequencies lower or higher than that to which the circuit is tuned.
Industry:Science
The activity of a substance is a thermodynamic property that is related to the chemical potential of that substance. Activities are closely related to measures of concentration, such as partial pressures and mole fractions, and are more convenient to use than chemical potentials. The conditions that hold in chemical reaction equilibrium and in phase equilibrium can be expressed in terms of activities of the species involved.
Industry:Science
Stripe phases are a recently discovered type of electronic crystal (similar to Wigner crystals). The difference between electronic and conventional crystals is that the lattice of an electronic crystal is made of electrons which, being much lighter than atomic nuclei, are subject to much stronger quantum and thermal fluctuations. Therefore electronic crystals are likely to melt at much lower temperatures than conventional ones.
Industry:Science
The definition of a nitric oxide (NO) biosensor is complicated by the fact that the term “biosensor” is often applied to (1) sensors that incorporate a biological entity (such as an enzyme or antibody) as a fundamental part of the recognition element, and (2) sensors that measure a particular analyte in a biological environment. In this article, NO biosensor refers to sensors capable of measuring NO in a biological environment.
Industry:Science
The ability of a soil to supply plant nutrients. Sixteen chemical elements are required for the growth of all plants: carbon, oxygen, and hydrogen (these three are obtained from carbon dioxide and water), plus nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, iron, manganese, zinc, copper, boron, molybdenum, and chlorine. Some plant species also require one or more of the elements cobalt, sodium, vanadium, and silicon.
Industry:Science
The composite of facilities and support equipment needed to assemble, check out, and launch a rocket-propelled vehicle. The term usually is applied to the facilities and equipment required to launch larger vehicles for which a substantial amount of prelaunch preparation is needed. Small operational rockets may require similar but highly simplified resources on a much smaller scale. For these, the term launcher is usually used.
Industry:Science
The fundamental unit of the primary scaled integument of vertebrates, of which the epidermal or dermal component may be the more conspicuous or elaborated. Scale may have different meanings in different contexts; the semantic confusion has arisen partly for historical reasons, partly because of inherent problems in understanding fossil material, and partly due to increased knowledge of the development of the integument and teeth.
Industry:Science
The accepted criteria for a television system, including the image aspect ratio, number of lines per frame, type of scanning, original video signal bandwidth, transmission format and bandwidth, reception, demodulation, decoding, and sound system. The implementation of high-definition television (HDTV), where the image resolution and audio fidelity are significantly higher than for conventional television, has required new standards.
Industry:Science
The branch of mathematics that deals with geometric figures, that is, collections of points that all lie in the same plane (coplanar). Although the words “point” and “plane” are undefined concepts, for elementary applications the intuitive meanings will serve: a point is a location, and a plane is a flat surface. For similar definitions, together with a discussion of the postulates and axioms (assumed truths) used in plane geometry,
Industry:Science
