- 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.
Flux-compression (or magnetic cumulative) generators provide a compact and relatively inexpensive source of energy for use in experimentation at remote sites or in situations where a capacitor bank is either too bulky or too expensive to use. Essentially single-shot devices, they can generate megajoules of energy in microseconds, with terawatts of peak power.
Industry:Science
Forensic document analysis, or forensic document examination as it is often called, is one of the oldest fields of forensic science. The examination of contested documents in North America gained notoriety during the early 1900s largely through the efforts of Albert S. Osborn and other founding members of the American Society of Questioned Document Examiners.
Industry:Science
Calorimeters measure all processes, chemical and physical, involving an exchange of heat energy with the surroundings. The calorimeter is nonspecific in its operation; that is, it will monitor and record all heats of reactions that occur. An isothermal microcalorimeter is operated at constant temperature and is used to measure heat flow in the microwatt range.
Industry:Science
Any set of elements which is equipped with an operation (called multiplication) satisfying the requirements (1), (2), (3), and (4) is called a group. Group theory is the branch of mathematics devoted to the properties of groups. Group theory has applications in many branches of physical sciences, and in some branches of algebra and in analytic function theory.
Industry:Science
Exchange currents which carry no electric charge and mediate certain types of electroweak interactions. The discovery of the neutral-current weak interactions and the agreement of their experimentally measured properties with the theoretical predictions were of great significance in establishing the validity of the Weinberg-Salam model of the electroweak forces.
Industry:Science
An oscillatory behavior of the magnetic moment of a pure metal crystal with changes in the applied magnetic field <i>B</i>, at very low temperatures. It is named after its discoverers W. J. de Haas and P. M. van Alphen. This effect has its origin in the Bohr-Sommerfeld quantization of the orbits of conduction electrons under the influence of the magnetic field.
Industry:Science
Any one of a wide variety of volatile hydrocarbon mixtures. They are sometimes obtained from coal tar, but more often they are derived from petroleum. Physical properties vary widely. The initial boiling point may be as low as 80°F (27°C), and end points may reach 500°F (260°C). Boiling ranges are sometimes as narrow as 20°F (11°C) or as wide as 200°F (110°C).
Industry:Science
Ice formed by the freezing of seawater. Ice in the sea includes sea ice, river ice, and land ice. Land ice is principally icebergs which are prominent in some areas, such as the Ross Sea and Baffin Bay. River ice is carried into the sea during spring breakup and is important only near river mouths. The greatest part, probably 99% of ice in the sea, is sea ice.
Industry:Science
Arenite (rock composed of sand-size fragments) that contains a high proportion of feldspar in addition to quartz and other detrital minerals. Arkose is also known as feldspathic sandstone. Although there is no universal agreement, many geologists consider a minimum of 25% feldspar a requisite for calling sandstone an arkose. Other geologists accept a lower value.
Industry:Science
Clouds and precipitation are two of the most important atmospheric topics for understanding and quantifying correctly the issues of global climate change. Since most of the current political and societal debate is centered on global warming and greenhouse gases, there is a general tendency to forget that clouds play a relevant role in modulating the Earth's climate.
Industry:Science
