- 行业: Printing & publishing
- Number of terms: 178089
- Number of blossaries: 0
- 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.
Electrical and thermal phenomena occurring when a current-carrying conductor or semiconductor is placed in a magnetic field. The galvanomagnetic effects are closely related to the thermomagnetic effects. Both sets of effects yield important information on the band structure of metals and semiconductors and on the nature of the conductivity process.
Industry:Science
Asteroids and comets that closely approach or cross the orbit of the Earth are called Near-Earth Objects (NEOs). The potential of these objects to collide with the Earth has increased interest in them. The effort to study Near-Earth Objects has grown substantially, but much remains to be done considering the tragic consequences they pose to humankind.
Industry:Science
Any one of a group of operations that change the shape, surface finish, or mechanical properties of a material by the application of special tools and equipment. Machining almost always is a process where a cutting tool removes material to effect the desired change in the workpiece. Typically, powered machinery is required to operate the cutting tools.
Industry:Science
Graptolites are common fossils in black shales of the Ordovician and Silurian periods (490–417 million years ago). Many species are globally distributed and have short time ranges, making them ideal for dating and correlating sedimentary rocks, with a precision, reliability, and wide applicability matched only by groups such as ammonites and conodonts.
Industry:Science
Any of a number of different phenomena which (a) alter a system in some way or (b) result in some type of response. In electrical network theory, an excitation initiates a response or a response sequence. In other areas of technology, an excitation establishes an altered condition which causes an apparatus or system to exhibit useful response capabilities.
Industry:Science
As mining projects encroach on civilization, the impacts on water quality are becoming more important. As mineral extraction policies with regard to the environment have evolved, it has become easier and less expensive for a mining company to design mitigation features into a mine plan rather than to try cleaning up environmental degradation after the fact.
Industry:Science
Collisions between aircraft and wildlife, principally birds, commonly referred to as birdstrikes, are a relatively new and increasingly hazardous threat to both civil and military aviation worldwide. Although birdstrikes have occurred since people began flying, only in the last 20 years or so has the problem become acute. There are several reasons for this.
Industry:Science
Either of two cool-season biennial crucifers, <i>Brassica oleracea</i> var. <i>acephala</i> and <i>B. fimbriata</i>, of Mediterranean origin. Kale belongs to the plant order Capparales, and the plant family Brassicaceae, commonly known as the mustard family. Cabbage, kohlrabi, broccoli, collards, and Brussels sprouts are all variants of <i>B. oleracea</i>
Industry:Science
In an internal combustion engine, the system for providing a continuous supply of oil between moving surfaces during engine operation. This viscous film, known as the lubricant, lubricates and cools the power transmission components while removing impurities, neutralizing chemically active products of combustion, transmitting forces, and damping vibrations.
Industry:Science
Electrical noise generators which produce calculable noise intensities at microwave frequencies, and which are used to calibrate other noise sources by using comparison methods. A factor limiting the performance of microwave communications and radar systems is receiver sensitivity (signal-to-noise ratio). To measure this, a reference noise source is needed.
Industry:Science
