- 行业: Printing & publishing
- Number of terms: 178089
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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 process by which information systems are designed, developed, tested, and maintained. The technical origins of information systems engineering can be traced to conventional information systems design and development, and the field of systems engineering. Information systems engineering is by nature structured, iterative, multidisciplinary, and applied. It involves structured requirement analyses, functional modeling, prototyping, software engineering, and system testing, documentation, and maintenance.
Industry:Science
The measurement of the quantity of heat energy involved in processes such as chemical reactions, changes of state, and mixing of substances, or in the determination of heat capacities of substances. The unit of energy in the International System of Units is the joule, symbolized J. Another unit still being used, but is strongly discouraged, is the calorie, symbolized cal and defined as 4.184 J. Most calorimetric measurements are made at constant pressure, and the measured change is called the enthalpy change.
Industry:Science
The primary chemical processing of materials such as wood, coal, oil shale, and some residual oils from refining of petroleum. It consists in heating material in an inert atmosphere at a temperature high enough for chemical decomposition. The principal products are (1) gases containing carbon monoxide, hydrogen, hydrogen sulfide, and ammonia, (2) oils, and (3) water solutions of organic acids, alcohols, and ammonium salts. For a discussion of the products of the destructive distillation, or coking, of coal
Industry:Science
The name for the North American rodents of the family Geomyidae. There are 39 species in 8 genera; 11 species are found in the United States. The distinctive name pocket gopher is applied to these animals since they have large, fur-lined cheek pouches which open outward on the side of the face. Two common species are the northern pocket gopher (<i>Thomomys talpoides</i>), a small burrowing species, most numerous in the western United States and Mexico, and the plains pocket gopher (<i>Geomys bursarius</i>).
Industry:Science
The mathematical discipline that studies the behavior of distributions of matter and energy when their discrete nature can be ignored; also known as continuum physics or continuum mechanics. The discrete nature of matter refers to its molecular nature, and that of energy to the quantum nature of force fields and of the mechanical vibrations that exist in any sample of matter. The theory is normally valid when the sample is of laboratory size or larger, and when the number of quanta present is also very large.
Industry:Science
The passage of electric charges due to a force exerted on them by an electric field. Conductivity is the measure of the ability of a conductor to carry electric current; it is defined as the ratio of the amount of charge passing through unit area of the conductor (perpendicular to the current direction) per second divided by the electric field intensity (the force on a unit charge). Conductivity is the reciprocal of resistivity and is therefore commonly expressed in units of siemens per meter, abbreviated S/m.
Industry:Science
The second-oldest period in the Paleozoic Era. The Ordovician is remarkable because not only did one of the most significant Phanerozoic radiations of marine life take place (early Middle Ordovician), but also one of the two or three most severe extinctions of marine life occurred (Late Ordovician). The early Middle Ordovician radiation of life included the initial colonization of land. These first terrestrial organisms were nonvascular plants. Vascular plants appeared in terrestrial settings shortly afterward.
Industry:Science
The maximum magnitude (value without regard to sign) of the disturbance of a wave. The term “disturbance” refers to that property of a wave which perturbs or alters its surroundings. It may mean, for example, the displacement of mechanical waves, the pressure variations of a sound wave, or the electric or magnetic field of light waves. Sometimes in older texts the word “amplitude” is used for the disturbance itself; in that case, amplitude as meant there is called peak amplitude. This is no longer common usage.
Industry:Science
The study of the substances and chemical processes which occur in living organisms. It includes the identification and quantitative determination of the substances, studies of their structure, determining how they are synthesized and degraded in organisms, and elucidating their role in the operation of the organism. Some processes of particular interest are the conversion of foods to energy, respiration, the synthesis of nucleic acids and proteins, and the regulation of the chemical activities of cells and organisms.
Industry:Science
The techniques involved in using photographic equipment underwater. Underwater photography is used to document subjects in fresh-water lakes and quarries, in temperate seas, beneath the polar ice pack, and in the deep sea, but by far the greatest percentage of underwater photography is done within sport-diving limits in the tropical oceans. The color and variety of marine life in the Caribbean Sea, Red Sea, or Indo-Pacific Ocean are diverse and compelling, creating an ever-changing portfolio of subjects to photograph.
Industry:Science
