- 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.
Our dependence on electrical energy and the demand for continuous and reliable power continue to grow. Recent wide-area electrical blackouts have raised many questions about the causes of such events and the weakness of interconnected power systems. The exchange of information obtained from blackouts worldwide, examination of the root causes, and application of both proven and new solutions to help prevent propagation of such large-scale events should help the electric power industry design, operate, and maintain reliable power delivery infrastructures for the future.
Industry:Science
More than 400 nuclear power plants currently provide about 16% of the world's electricity. These plants were developed primarily for power production by regulated electric utilities. The advanced nuclear reactors now under development must meet and exceed public expectations for safety, security, and sustainability, while remaining economically competitive in the emerging deregulated electricity markets. In addition, the advanced reactors should continue to contribute to the reduction of greenhouse gases and pollution emissions resulting from electric power production.
Industry:Science
Power derived from fission or fusion nuclear reactions. More conventionally, nuclear power is interpreted as the utilization of the fission reactions in a nuclear power reactor to produce steam for electric power production, for ship propulsion, or for process heat. Fission reactions involve the breakup of the nucleus of high-mass atoms and yield an energy release which is more than a millionfold greater than that obtained from chemical reactions involving the burning of a fuel. Successful control of the nuclear fission reactions utilizes this intensive source of energy.
Industry:Science
Many options exist to power light-duty vehicles, which include cars, SUVs, and small trucks. Most vehicles are now powered by the combustion of gasoline, and diesel fuel is becoming increasingly common. As the transportation industry moves toward using cleaner fuels, natural gas is receiving serious consideration. Natural gas as well as biofuels and electricity from batteries or fuel cells serve the goals of improving energy efficiency, reducing or eliminating greenhouse gas emissions, reducing the cost of operating vehicles, and diversifying the available energy sources.
Industry:Science
Nuclear reactors are receiving renewed interest in the United States for generation of electric power to help meet future energy requirements. Modular helium reactors (MHRs), a type of high-temperature gas-cooled reactor (HTGR), have high potential for satisfying the need for new energy generation capacity. They can be used to drive Brayton-cycle energy-conversion systems to produce electricity at high efficiency and low cost. Moreover, they can be used for efficient, cost-effective production of hydrogen that would enable further development of a hydrogen energy economy.
Industry:Science
Ordered, countable sets of numbers, <i>x</i><sub>1</sub>, <i>x</i><sub>2</sub>, <i>x</i><sub>3</sub>,…, not necessarily all different. In general such sets are called sequences, whereas the term progression is usually confined to the special types: the arithmetic, in which the difference <i>x</i><sub><i>k</i></sub> − <i>x</i><sub><i>k</i>−1</sub> between successive terms is constant; the geometric, in which the ratio <i>x</i><sub><i>k</i></sub>/<i>x</i><sub><i>k</i>−1</sub> is constant; and the harmonic, in which the reciprocals of the terms are in arithmetic progression.
Industry:Science
Sociobiologist E. O. Wilson called altruism the “central theoretical problem” of the sciences. Humans exhibit a level and diversity of altruism that is unknown among other species. Thus, the study of human altruism has attracted attention from researchers in all the biological and social sciences. Growing empirical evidence increasingly points to the varieties of human altruism, leading to decreasing emphasis on once-standard models that assume narrow self-interest. Such models are now being replaced with new explanations for the emergence and existence of human altruism.
Industry:Science
One of three carnivorous mammals, also known as polecats, in the family Mustelidae. The European polecat (<i>Mustela putorius</i>) inhabits Europe west of the Ural Mountains; the steppe polecat (<i>M. eversmanni</i>) is found in the steppe zone from Austria to Manchuria and Tibet; and the black-footed ferret (<i>M. nigripes</i>) (see illus.) inhabits the plains region of North America from Alberta and Saskatchewan to northeastern Arizona and Texas. The domestic ferret (<i>M. putorius furo</i>) is generally thought to be a descendant of one or both of the Old World species.
Industry:Science
Red blood cells express multiple molecules, including hundreds of different proteins and carbohydrates on their surfaces. These surface molecules vary among individuals. Some of these surface molecules are not present on some people's red blood cells. Other surface molecules exist in slightly different forms in different people. These variations are important during transfusion of red blood cells because cell surface molecules on the transfused red blood cells that are not present on a patient's red blood cells are “foreign” and can induce an immune response in the patient.
Industry:Science
One of the two major types of flowering plants (angiosperms), characterized by possession of three apertures in their pollen; the other major type is magnoliids. Although this difference in pollen development and form has been known for a long time, it has become clear, as a result of several studies of deoxyribonucleic acid (DNA) sequences, that this difference is very significant. The high degree of coincidence of the genetic data with this pollen distinction means that it is more important to recognize this distinction than the number of seed leaves, as previously thought.
Industry:Science
