- 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 system that stores fuel for present use and delivers it as needed to an engine; includes the fuel tank, fuel lines, pump, filter, vapor return lines, carburetor or injection components, and all fuel system vents and evaporative emission control systems or devices that provide fuel supply and fuel metering functions. Some early vehicles and other engines had a gravity-feed fuel system, in which fuel flowed to the engine from a tank located above it. Automotive and most other engines have a pressurized fuel system with a pump that draws or pushes fuel from the tank to the engine.
Industry:Science
The phenomenon of simultaneous vision with two eyes, producing a visual experience of the third dimension, that is, a vivid perception of the relative distances of objects in space. In this experience the observer seems to see the space between the objects located at different distances from the eyes. The stereoscopic effect is unique and cannot be easily described to one who does not possess it. Stereopsis, or stereoscopic vision, provides the individual with the most acute sense of relative depth and is of vital importance in visual tasks requiring the precise location of objects.
Industry:Science
The study of those properties of microwaves which are analogous to the properties of light waves in optics. The fact that microwaves and light waves are both electromagnetic waves, the major difference being that of frequency, already suggests that their properties should be alike in many respects. But the reason microwaves behave more like light waves than, for instance, very low-frequency waves for electrical power (50 or 60 Hz) is primarily that the microwave wavelengths are usually comparable to or smaller than the ordinary physical dimensions of objects interacting with the waves.
Industry:Science
The number of sensors of all types installed in vehicles and industrial plants worldwide for operational safety and process control is in the billions and increasing exponentially. Historically, sensors have been linked by cables to electronic modules, which provide excitation, amplification, signal conditioning, and display. There are severe problems, however, when sensing parameters such as strain, pressure, torque, and temperature with sensors mounted on rotating components or operating in hazardous or extreme environments. For these applications, wireless sensing is advancing rapidly.
Industry:Science
The methods and techniques used to convert plastics materials in the form of pellets, granules, powders, sheets, fluids, or preforms into formed shapes or parts. Although the term plastics has been used loosely as a synonym for polymers and resins, plastics generally represent polymeric compounds that are formulated with plasticizers, stabilizers, fillers, and other additives for purposes of processability and performance. After forming, the part may be subjected to a variety of ancillary operations such as welding, adhesive bonding, machining, or surface decorating (painting, metallizing).
Industry:Science
The term “biodiversity” refers to the variety of life on the planet—extending in scale from genes to species to ecosystems. Our understanding of biodiversity conservation, however, faces a twofold knowledge gap. First, we have no complete list of the components of biodiversity at the different levels, and second, it is difficult to judge what their values might be in the future. Therefore a core strategy for biodiversity conservation is to estimate patterns of variation, and then try to conserve as much of that variation as possible, so as to retain the full range of possible future values.
Industry:Science
The small cluster of galaxies that contains the Milky Way Galaxy. Galaxies exhibit a pronounced tendency to clump together on a variety of scales. It is assumed that gravitational attraction draws galaxies together. On a very large scale, this attractive process may still be at an early stage, resulting in filamentary structures which are only mildly perturbed in their motions from the general expansion of the universe. On a smaller scale, the process has led to collapse. Galaxies have fallen together, though with enough angular momentum that they usually orbit each other rather than collide.
Industry:Science
The state of the atmosphere, as determined by the simultaneous occurrence of several meteorological phenomena at a geographical locality or over broad areas of the Earth. When such a collection of weather elements is part of an interrelated physical structure of the atmosphere, it is termed a weather system, and includes phenomena at all elevations above the ground. More popularly, weather refers to a certain state of the atmosphere as it affects humans' activities on the Earth's surface. In this sense, it is often taken to include such related phenomena as waves at sea and floods on land.
Industry:Science
The system of naming animals that was adopted by zoologists and detailed in the International Code of Zoological Nomenclature. The present system is founded on the 10th edition of C. Linnaeus's <i>Systema Naturae</i> (1758) and has evolved through international agreements culminating in the Code adopted in 1985. The primary objective of the Code is to promote the stability of the names of taxa (groups of organisms) by providing rules concerning name usage and the activity of naming new taxa. The rules are binding for taxa ranked at certain levels and nonbinding on taxa ranked at other levels.
Industry:Science
The textbook view of early vertebrate evolution posits that although vertebrates were present in the Ordovician and perhaps the Cambrian, they were rare and remained at low diversity until they underwent an explosive radiation during the Mid to Late Silurian. This canonical view has been overturned in recent years with the discovery of an entirely unanticipated diversity of vertebrates in the Cambrian and Ordovician, the reinterpretation of the affinity (phylogenetic relationship) of taxa that were long known but poorly understood, and the incorporation of all these data into new phylogenies.
Industry:Science
