- 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.
The expulsion of magnetic flux from the interior of a superconducting metal when it is cooled in a magnetic field to below the critical temperature, near absolute zero, at which the transition to superconductivity takes place.
Industry:Science
The automatic control of the intermediate frequency in a radio, television, or radar receiver, to correct for variations of the frequency of the transmitted carrier or the local oscillator. In high-fidelity broadcast receivers AFC keeps distortion due to detuning to a low figure. In the reception of long-haul telegraph signals, AFC reduces the error rate due to signal pulse distortion or interference from lower intensity signals in the same frequency band.
Industry:Science
That branch of mechanics which deals with the motion of a system of material particles without reference to the forces which act on the system. Kinematics differs from dynamics in that the latter takes these forces into account.
Industry:Science
The basic unit of length in the solar system. The astronomical unit (AU) is also used to a limited extent for interstellar distances through the definition of the parsec (1 pc = 206,265 AU). It is nearly equal to the mean distance <i>a</i> between the center of mass of the Sun and the center of mass of the Earth-Moon system (<i>a</i> = 1.00 000 23 AU), and for that reason it is often convenient to think of it as the mean distance between the Sun and Earth.
Industry:Science
Stereo modeling is the process of creating a three-dimensional model of an object. The model can be in the form of a two-dimensional color picture, a three-dimensional rotating model on a computer screen, or an actual physical part.
Industry:Science
The interdisciplinary study that attempts to determine how much astronomy prehistoric people knew and how it influenced their lives. It involves multiple disciplines: astronomy to chart the heavens, archeology to probe the cultural context, engineering to survey sites, and ethnology to provide clues to the cultural past. Archeoastronomy has prompted valuable insights into the astronomy of the past, even to revolutionizing some models of prehistoric cultures.
Industry:Science
The flight of China's first astronaut, Yang Liwei, on October 15–16, 2003, answered many questions about China's ability to explore space, and raised new questions about the future of space activities in China and in other countries.
Industry:Science
That end of the Earth's rotational axis opposite the North Pole. It is the southernmost point on the Earth and one of the two points through which all meridians pass (the North Pole being the other point). This is the geographic pole and is not the same as the south magnetic pole, which is near the coast of Antarctica, south of Tasmania. The South Pole lies inland from the Ross Sea, within the landmass of Antarctica, at an elevation of about 9200 ft (2800 m).
Industry:Science
The fruit <i>Citrus limon</i>, commercially the most important of the acid citrus. It probably originated in the eastern Himalayan region of India or adjoining areas, and was introduced into Europe by the Arabs by the twelfth century.
Industry:Science
The branch of mathematics that studies the qualitative properties of spaces, as opposed to the more delicate and refined geometric or analytic properties. While there are earlier results that belong to the field, the beginning of the subject as a separate branch of mathematics dates to the work of H. Poincaré during 1895–1904. The ideas and results of topology have a central place in mathematics, with connections to almost all the other areas of the subject.
Industry:Science
