- 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.
An elementary particle having approximately the same mass as the proton, but lacking a net electric charge. It is indispensable in the structure of the elements, and in the free state it is an important reactant in nuclear research and the propagating agent of fission chain reactions. Neutrons, in the form of highly condensed matter, constitute the substance of neutron stars.
Industry:Science
An elementary particle with an unusually long lifetime or, from the Heisenberg uncertainty principle, with an extremely narrow width Γ = 86.6 ± 6.0 keV, and a large mass <i>m</i> = 3096.93 ± 0.09 MeV. It is a bound state containing a charm quark and an anticharm quark. The discovery of the J/psi particle is one of the cornerstones of the standard model.
Industry:Science
An elevation in the central body temperature of warm-blooded animals caused by abnormal functioning of the thermoregulatory mechanisms. Fever accompanies a wide variety of disease states, both infectious and noninfectious, and in the great majority of instances is due to an abnormality in the regulation of body temperature by the central nervous system.
Industry:Science
An elongated, sloping zone in the troposphere, within which changes of temperature and wind velocity are large compared to changes outside the zone. Thus the passage of a front at a fixed location is marked by rather sudden changes in temperature and wind and also by rapid variations in other weather elements such as moisture and sky condition.
Industry:Science
An elusive elementary particle that interacts with matter principally through the weak nuclear force. Neutrinos are electrically neutral spin-½ fermions with left-handed helicity. Many weak interaction processes (interactions that involve the weak force), such as radioactive nuclear beta decay and thermonuclear fusion, involve neutrinos. Present experimental knowledge is consistent with neutrinos being point particles that have no internal constituents. Neutrinos are classified as neutral leptons, where leptons are defined as elementary particles that interact with the electroweak (electromagnetic and weak nuclear) and gravitational forces but not with the strong nuclear force.
Industry:Science
An embryonic shoot containing the growing stem tip surrounded by young leaves or flowers or both, and the whole frequently enclosed by special protective leaves, the bud scales.
Industry:Science
An empirical rule which states that the total resistivity of a crystalline metallic specimen is the sum of the resistivity due to thermal agitation of the metal ions of the lattice and the resistivity due to the presence of imperfections in the crystal. This rule is a basis for understanding the resistivity behavior of metals and alloys at low temperatures.
Industry:Science
An emulsified fatty food product used as a spread and a baking and cooking fat, consisting of an aqueous phase dispersed in the fat as a continuous phase. Hyppolyte Mège-Mouriés invented margarine in 1869 and won the prize offered by Louis Napoleon for the development of an inexpensive butter substitute. Margarine is now considered a food in its own right and is manufactured in forms unknown to butter, such as plastic, soft, or fluid. However, the interrelationship is still acknowledged since margarine is colored, flavored, fortified with vitamins, and otherwise formulated to have the same or similar taste, appearance, and nutritional value as butter.
Industry:Science
An enclosed space provided for the combustion of fuel to generate steam. The closure confines the products of combustion and is capable of withstanding the high temperatures developed and the pressures used. Its dimensions and geometry are adapted to the rate of heat release, to the type of fuel, and to the method of firing so as to promote complete burning of the combustible and suitable disposal of ash. In water-cooled furnaces the heat absorbed materially affects the temperature of gases at the furnace outlet and contributes directly to the generation of steam.
Industry:Science
An enclosure capable of resounding or resonating and thereby intensifying sound tones or electromagnetic waves. Resonance is the phenomenon which results when the frequency of the impressed driving force is the same as the natural vibration of the cavity. Vibrating rods, the tuning fork, musical instrument strings, radio and television channel tuners, and so forth, constitute resonating systems as well. The cavity resonator enclosure has a volume which stores energy oscillating between one form and another. In the case of sound, the oscillation is between displacement and velocity of particles. In the case of electromagnetic waves, the energy oscillates between the magnetic and the electric fields.
Industry:Science
