- 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.
A steam boiler designed to suit the marine environment and generally arranged to supply steam to the main propulsion machinery, ship's service electric generators, feed-pump drivers, and other auxiliary services.
Industry:Science
A steam boiler in which hot gaseous products of combustion pass through tubes surrounded by boiler water. The water and steam in fire-tube boilers are contained within a large-diameter drum or shell, and such units often are referred to as shell-type boilers. Heat from the products of combustion is transferred to the boiler water by tubes or flues of relatively small diameter (about 3–4 in. or 7.5–10 cm) through which the hot gases flow. The tubes are connected to tube sheets at each end of the cylindrical shell and serve as structural reinforcements to support the flat tube sheets against the force of the internal water and steam pressure. Braces or tension rods also are used in those areas of the tube sheets not penetrated by the tubes.
Industry:Science
A steam boiler in which water circulates within tubes and heat is applied from outside the tubes. The outstanding feature of the water-tube boiler is the use of small tubes exposed to the products of combustion and connected to steam and water drums which are shielded from these high-temperature gases. Thus, possible failure of boiler parts exposed to direct heat transfer is restricted to the small-diameter tubes and, in the event of failure, the energy released is reduced and explosion hazards are minimized.
Industry:Science
A steam-actuated device for pumping compressible fluids, usually from subatmospheric suction pressure to atmospheric discharge pressure. A steam jet ejector is most frequently used for maintaining vacuum in process equipment in which evaporation or condensation takes place. Because of its simplicity, compactness, reliability, and generally low first cost, it is often preferred to a mechanical vacuum pump for removing air from condensers serving steam turbines, especially for marine service.
Industry:Science
A steel instrument consisting of two prongs and a handle which, when struck, emits a tone of fixed pitch. Because of their simple mechanical structure, purity of tone, and constant frequency, tuning forks are widely used as standards of frequency in musical acoustics. In its electrically driven form, a tuning fork serves to control electric circuits by producing frequency standards of high accuracy and stability.
Industry:Science
A steroid hormone produced in the corpus luteum and placenta. The hormone has an important physiological role in the luteal phase of the menstrual cycle and in the maintenance of pregnancy. In addition, progesterone produced in the testis and adrenals has a key role as an intermediate in the biosynthesis of androgens, estrogens, and the corticoids (adrenal cortex steroid).
Industry:Science
A stimulating drug that affects the brain and the body in a variety of ways, also known by the trade name Benzedrine. Chemically, amphetamine is a racemic mixture of the <i>l</i> and <i>d</i> isomers of α-methyl-β-phenethylamine. The <i>l</i> isomer has more pronounced effects on the body, while the <i>d</i> isomer (commonly referred to as Dexedrine) has a greater effect on the brain. On the whole, the pharmacological effects of amphetamine are to produce an increase in blood pressure, a relaxation of bronchial smooth muscle, a constriction of the blood vessels supplying the skin and mucous membranes, and a variety of alterations in behavior.
Industry:Science
A straining action produced by couples that act normal to the axis of a member. Torsion is identified by a twisting deformation.
Industry:Science
A strategic conflict is an interaction of two or more decision makers over issues such as rights or resources. Some conflicts, such as terrorist attacks, exhibit outright hostility, while others are highly cooperative situations in which disputants form coalitions or jointly act to achieve win/win solutions, that is, resolutions in which everyone gains. The key ingredients of any conflict model are the decision makers in disagreement, each decision maker's options or courses of action, how a scenario or state is determined by the decision makers' choices, and their objectives or preferences over states. Conflict analysis provides methodologies for studying these multiple participant–multiple objective decision situations systematically. By enhancing understanding and communication, it can lead to better decisions that produce resolutions that are more preferable, more stable, and more fair.
Industry:Science
A strategy that organisms use to avoid or deflect the attacks of predators by misleading the latter's visual senses. Protective devices directed at the hearing or the sense of smell of the predators are harder for researchers to detect, and are known in only a small number of species.
Industry:Science
