- 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 very dense rock composed of red-brown garnet and the grape-green pyroxene omphacite. Eclogites possess basaltic bulk chemistry, and their garnets are rich in the components pyrope (Mg<sub>3</sub>Al<sub>2</sub>Si<sub>3</sub>O<sub>12</sub>), almandine (Fe<sub>3</sub>Al<sub>2</sub>Si<sub>3</sub>O<sub>12</sub>), and grossular (Ca<sub>3</sub>Al<sub>2</sub>Si<sub>3</sub>O<sub>12</sub>), while the pyroxenes are rich in jadeite (NaAlSi<sub>2</sub>O<sub>6</sub>) and diopside (CaMgSi<sub>2</sub>O<sub>6</sub>). Accessory phases depend on the environment of crystallization, but may include quartz, kyanite, amphibole, olivine, orthopyroxene, zoisite, mica, and rutile, but never plagioclase.
Industry:Science
A very distinctive order of actinopterygian fishes, also known as the Heterosomata or commonly the flatfishes, which in turn are known by a variety of common names: halibut, turbots, plaice, flounders, soles, tonguefishes, and others. All adults are characterized by a flattened (laterally compressed) body with both eyes located on the same side of the head. Larval flatfishes are bilaterally symmetrical, but early in development one eye migrates across the top of the head to the other side. The asymmetry is reflected in complex modifications of the skull bones and associated muscles and nerves, as well as dentition, squamation (arrangement of scales), visceral anatomy, and paired fins. A given family is usually either dextral (eyes on the right side) or sinistral (eyes on the left side); however, some families have both dextral and sinistral members even at the species level. Flatfishes are further characterized by pigmented upper side; blind side usually lacking pigment; cycloid or ctenoid scales; tubercles in some species; long-based dorsal and anal fins, with the dorsal fin base extending to or beyond the eyes (except in the family Psettodidae); body cavity quite reduced in size; usually six or seven branchiostegal (gill bone) rays; and a swim bladder in adults of only a few species.
Industry:Science
A very large group of fishes containing 27% of all known fishes of the world and accounting for 64% of the freshwater species. Although the perci forms dominate modern seas, the ostariophysans command preeminent faunal importance in freshwaters. At least one-half of the freshwater fishes of each continent, with the exception of Australia, belong to this group.
Industry:Science
A very light-colored, aphanitic (not visibly crystalline), volcanic rock that is rich in silica and broadly equivalent to granite in composition. Migration of rhyolitic magma through the Earth's crust, which causes much of the Earth's explosive and hazardous volcanic activity, represents a major process of chemical fractionation by which continental crust grows and evolves.
Industry:Science
A very sensitive vacuum-tube detector of light or radiant flux containing a photocathode which converts the light to photoelectrons; one or more secondary-electron-emitting electrodes or dynodes which amplify the number of photoelectrons; and an output electrode or anode which collects the secondary electrons and provides the electrical output signal. It is less frequently known as a multiplier phototube or photomultiplier tube. Because of the very large amplification provided by the secondary-emission mechanism, and the very short time variation associated with the passage of the electrons within the device, the photomultiplier is applied to the detection and measurement of very low light levels, especially if very high speed of response is required.
Industry:Science
A very small sensor with physical dimensions in the submicrometer to millimeter range. A sensor is a device that converts a nonelectrical physical or chemical quantity, such as pressure, acceleration, temperature, or gas concentration, into an electrical signal. Sensors are an essential element in many measurement, process, and control systems, with countless applications in the automotive, aerospace, biomedical, telecommunications, environmental, agricultural, and other industries. The stimulus to miniaturize sensors lies in the enormous cost benefits that are gained by using semiconductor processing technology, and in the fact that microsensors are generally able to offer a better sensitivity, accuracy, dynamic range, and reliability, as well as lower power consumption, than their larger counterparts.
Industry:Science
A vessel having double walls, the space between being evacuated and the surfaces facing the vacuum being heat reflective. It was invented in 1892 by James Dewar as a container for liquid oxygen.
Industry:Science
A vessel in which chemical reactions take place. A combination of vessels is known as a chemical reactor network. Chemical reactors have diverse sizes, shapes, and modes and conditions of operation based on the nature of the reaction system and its behavior as a function of temperature, pressure, catalyst properties, and other factors.
Industry:Science
A view of an object (actual or imagined) as it would be seen by an observer who looks at the object either in a chosen direction or from a selected point of view. One such view often suffices to give the reader a clear picture of the shape and details of the object. Pictorial sketches often are more readily made and more clearly understood than are front, top, and side views of an object. Pictorial drawings, either sketched freehand or made with drawing instruments, are frequently used by engineers and architects to convey ideas to their assistants and clients.
Industry:Science
A vigorous deciduous fruiting vine (family Actinidiceae) that is native to central China, where it commonly grows in moist and sheltered areas on the forest edges. Kiwifruit requires both the female cultivar and a male pollenizer for successful fruit production. The kiwifruit industry depends on a single female cultivar, Hayward, the fruit having a creamy-white central core, black-brown seeds, and a bright translucent green outer flesh surrounded by a light brown fuzzy skin. It is adapted to moderate climates in the temperate zone and requires 600–850 h of winter chilling (temperatures between 32 and 45°F or 0 and 7°C) to ensure uniform budbreak. Kiwifruit wood is susceptible to winter injury at temperatures below 14°F (−10°C), and flower buds can be damaged by frost below 29°F (−1.5°C).
Industry:Science
