- 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.
In gas dynamics, the ratio of the molecular mean free path λ to some characteristic length <i>L</i>: Kn = λ/<i>L</i>. The length chosen will depend on the problem under consideration. It may be, for example, the diameter of a pipe or an object immersed in a flow, or the thickness of a boundary layer or a shock wave.
Industry:Science
Inhibition of the replication of a virus by a previous infection with another virus. The two viruses may be unrelated, related, or identical. In some cases, virus interference may take place even if the first virus was inactivated. The term mutual exclusion has been applied to this phenomenon in bacterial viruses.
Industry:Science
Magnetotellurics is a geophysical exploration technique that uses surface measurements of natural electromagnetic fields to image subsurface electrical resistivity. First proposed by L. Cagniard and A. N. Tikhonov in the 1950s, it has developed into a powerful tool for geophysical exploration on a wide range of scales.
Industry:Science
Microorganisms have long intrigued, terrified, and baffled human beings. Although most microorganisms are not pathogenic to humans, a few are, and they receive most of the attention. More and more researchers now believe that it is how these microorganisms live that can really matter in terms of the diseases they cause.
Industry:Science
One of the two classes which collectively make up the division Magnoliophyta (Angiospermae), the flowering plants. The Liliopsida, often known as Monocotyledoneae, or monocotyledons, embrace 5 subclasses (Alismatidae, Commelinidae, Arecidae, Zingiberidae, and Liliidae), 18 orders, 61 families, and about 55,000 species.
Industry:Science
Small proteins or carbohydrates (capable of stimulating an immune response) that are present in normal fetal tissues during early development but also are abnormally expressed by adult tumors. Oncofetal antigens are different from tumor-associated antigens, which are found only in tumors and have no role in development.
Industry:Science
Numerous biological studies confirm that the best hydrodynamic properties in nature belong to dolphins, whereas maximum relative speeds are achieved in air by birds and insects. Actually, flying and swimming creatures employ similar principles for motion. They propel and control their motions using flapping wings or fins.
Industry:Science
Localized regions in a material that can capture and localize an electron or hole, thus preventing the electron or hole from moving through the material until supplied with sufficient thermal or optical energy. Traps in solids are associated with imperfections in the material caused by either impurities or crystal defects.
Industry:Science
Instruments used in surveying operations to measure vertical angles, horizontal angles, and distance. The devices used for these measurements were originally mechanical only, but advances in the technology led to the development of mechanical-optical devices, optical-electronic devices, and finally, electronic-only devices.
Industry:Science
Mixtures of substances that produce noise, light, heat, smoke, or motion when ignited. They are used in matches, incendiaries, and other igniters; in fireworks and flares; in fuses and other initiators for primary explosives; in delay trains; for powering mechanical devices; and for dispersing materials such as insecticides.
Industry:Science
