- 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.
A design drawing or graphical statement of the overall form of a component or device, which is usually prepared during the innovative stages of a design. Since it lacks detail and completeness, a layout drawing provides a faithful explanation of the device and its construction only to individuals such as designers and drafters who have been intimately involved in the conceptual stage. In a sense, the layout drawing is a running record of ideas and problems posed as the design evolves. In the layout drawing, for instance, considerations of kinematic design of a mechanical component are explored graphically in incomplete detail, showing only those aspects of the elements and their interrelationships to be considered in the design. In most cases the layout drawing ultimately becomes the primary source of information from which detail drawings and assembly drawings are prepared by other drafters under the guidance of the designer.
Industry:Science
A detailed evaluation intended to assure that, for any structure, the deformations will be sufficiently below allowable values that structural failure will not occur. The deformations may be elastic (fully recoverable) or inelastic (permanent). They may be small, with an associated structural failure that is cosmetic; for example, the deflection of a beam supporting a ceiling may cause cracking of the plaster. They may be large, with an associated structural failure that is catastrophic; for example, the buckling of a column or the fracture of a tension member causes complete collapse of the structure.
Industry:Science
A detector of ionizing radiation. When a fast-moving charged particle traverses a Geiger-Müller counter, an electrical impulse is produced. These impulses can readily be counted by electronic circuits. Geiger-Müller (GM) counters, usually referred to simply as Geiger counters, are widely used to indicate the presence and intensity of nuclear radiations.
Industry:Science
A determination of the duration between two instants of time (epochs). Time intervals are measured with high precision with a digital display counter. An electronic oscillator generates pulses; the count begins with a start signal and ends with a second signal. For an oscillator frequency of 100 MHz, for example, a direct reading is correct to 10 nanoseconds (1 ns = 10<sup>−9</sup> s). Two atomic clocks, however, can be compared in epoch to 1 picosecond (1 ps = 10<sup>−12</sup> s) by electronic interpolation.
Industry:Science
A developmental disability characterized by significantly subaverage general intellectual functioning, with concurrent deficits in adaptive behavior. The causes are many and include both genetic and environmental factors as well as interactions between the two.
Industry:Science
A deviation from exact symmetry. According to modern physical theory the fundamental laws of physics possess a very high degree of symmetry. Several deep insights into nature arise in understanding why specific physical systems, or even the universe as a whole, exhibit less symmetry than the laws themselves.
Industry:Science
A device attached to an air-distributing duct for the purpose of discharging air into the space to be heated or cooled. These openings are referred to as registers, diffusers, supply outlets, or grills. By common acceptance, a register is an opening provided with means for discharging the air in a confined jet, whereas a diffuser is an outlet which discharges the air in a spreading jet (see <b>illus.</b>). Both registers and diffusers may be placed at a number of locations in a room, including the floor, baseboard, low or high on the sidewall, window sill,or ceiling.
Industry:Science
A device capable of increasing the magnitude of a physical quantity. This article discusses electronic amplifiers whose operation depends on transistors. Some amplifiers are magnetic, while others may take the form of rotating electrical machinery. Forms of nonelectrical amplifiers are hydraulic actuators and levers which are amplifiers of mechanical forces.
Industry:Science
A device designed to initiate a desired action in response to a change in its surroundings caused by an unwanted fire. Heat detectors respond when the surrounding temperature exceeds a specific minimum value or when the rate of rise exceeds a specified rate. Heat-detector sensing elements are normally mechanical, employing components which melt or expand when heated, but can also be electronic, using elements which produce thermoelectric voltages or change in conductivity.
Industry:Science
A device designed to protect the wearer from noxious gases, vapors, and aerosols or to supply oxygen or doses of medication to the wearer. Respirators are used widely in industry to protect workers against harmful atmospheres, and in the military to protect personnel against chemical or biological warfare agents. <b>Figure 1</b> shows the general classification of respirators according to whether they are atmosphere-supplying or air-purifying.
Industry:Science
