- 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 effectiveness of any research, by its nature, is difficult to evaluate. There is not much agreement among managers and researchers as to what constitutes effective research. Research effectiveness depends on a number of factors such as the type of industry, the nature of the market, and the state of technology. Both financial and nonfinancial measures have been used to define effectiveness, and both have problems.
Industry:Science
The hypothetical force particles believed to bind quarks into strongly interacting particles. Theoretical models in which the strong interactions of quarks are mediated by gluons have been successful in predicting, interpreting, and explaining many phenomena in particle physics, but free gluons remain undetected in experiments (as do free quarks). According to prevailing opinion, an individual gluon cannot be isolated.
Industry:Science
The condensation products obtained by the reaction of urea or melamine with formaldehyde. Resinous condensation products of formaldehyde with other nitrogen-containing compounds, for example, aniline and amides, also belong to this group of resins but have gained only limited utility. Resins derived from the condensation of formaldehyde with urea, melamine, aniline, and <i>p</i>-toluene sulfonamide are discussed below.
Industry:Science
The economic production of pure copper metal, suitable for fabrication and use, from copper ores containing as little as 0.5% Cu. Over 90% of the consumption of primary copper in the Western world is produced from ores containing sulfide minerals (chalcopyrite, CuFeS<sub>2</sub>; chalcocite, Cu<sub>2</sub>S; and bornite, Cu<sub>5</sub>FeS<sub>4</sub>) that can be economically treated only by pyrometallurgical processes.
Industry:Science
The group of primates most closely related to humans. They include the African great apes, the gorillas and chimpanzees; the Asian great apes, the orangutans; and the lesser apes from Asia, the gibbons. The apes can be distinguished from the rest of the primates by a number of anatomical and behavioral traits, which indicate their common origin; thus they are considered a monophyletic group and are called the Hominoidea.
Industry:Science
Systems consisting of three basic elements—a personal paging receiver, radio transmitter, and an encoding device—whose primary purpose is to alert an individual, or group of individuals, and deliver a short message, typically of a temporary or perishable nature. Characteristics that are used to define a specific paging system include distance covered, radio frequency, modulation type, paging code format, and message type.
Industry:Science
That portion of a fluid flow, near a solid surface, where shear stresses are significant and the inviscid-flow assumption may not be used. All solid surfaces interact with a viscous fluid flow because of the no-slip condition, a physical requirement that the fluid and solid have equal velocities at their interface. Thus a fluid flow is retarded by a fixed solid surface, and a finite, slow-moving boundary layer is formed.
Industry:Science
The difference between the electrical potential of an electrode or cell under the passage of current and the thermodynamic value of the electrode or cell potential under identical experimental conditions in the absence of electrolysis; it is also known as overpotential. Overvoltage is expressed in volts, often in absolute value; it is a measure of the rates of the different processes associated with an electrode reaction.
Industry:Science
That portion of an aircraft consisting of the wheels, tires, brakes, energy absorption mechanism, and drag brace. The landing gear is also referred to as the aircraft undercarriage. Additional components attached to and functioning with the landing gear may include retracting mechanisms, steering devices, shimmy dampers, and door panels.
Industry:Science
Substances that flow under shear stress and have a density range from essentially zero (gases) to solidlike values (liquids). Fluids comprise one of the two major forms of matter. Solids, the other form, generally deform very little when shear forces are applied, and their densities do not change significantly with pressure or temperature.
Industry:Science
