- 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 narrow, elongated tube closed at one end, extending from the cecum, a blind pocket off the first part of the large intestine (see <b>illus.</b>). It is found in only a few mammals.The size and detailed structure of the appendix vary markedly, depending on the species and the age of the individual. Most reptiles, birds, and mammals have either a single or a paired cecum at the anterior end of the large intestine, but it is quite rare that this cecum has a thinner projection or true appendix.
Industry:Science
Max Weber termin obiektywizm socjologów w interpretacji danych.
Industry:Sociology
A natural and extremely useful extension of the familiar real numbers. They can be introduced formally as follows. Consider the two-dimensional real vector space consisting of all ordered pairs (<i>a</i><sub>1</sub>, <i>a</i><sub>2</sub>) of real numbers. Geometrically this space can be identified with the ordinary euclidean plane, viewing the real numbers <i>a</i><sub>1</sub>, <i>a</i><sub>2</sub> as the coordinates of a point in the plane.
Industry:Science
A natural cavity located underground or in the side of a hill or cliff, generally of a size to admit a human. Caves occur in all types of rocks and topographic situations. They may be formed by many different erosion processes. The most important are created by ground waters that dissolve the common soluble rocks—limestone, dolomite, gypsum, and salt. Limestone caves are the most frequent, longest, and deepest. Lava-tube caves, sea caves created by wave action, and caves caused by piping in unconsolidated rocks are the other important types. The science of caves is known as speleology.
Industry:Science
A natural fiber, also known as coco fiber, obtained from the husks of the coconut (<i>Cocos nucifera</i>). Although coconuts are grown for copra throughout the tropics and into the subtropics, more than 95% of the coir exports are from Sri Lanka and India. Small amounts are exported from Thailand, Tanzania, Mexico, the Philippines, Malaysia, Kenya, Trinidad, and Tobago. A few other countries produce small amounts of fiber for their own use.
Industry:Science
A natural glass formed by rapid cooling of magma. Magmas typically comprise crystals and bubbles of gas within a silicate liquid. On slow cooling, the liquid portion of the magma usually crystallizes, but if cooling is sufficiently rapid, it may convert to glass—an amorphous, metastable solid that lacks the long-range microscopic order characteristic of crystalline solids.
Industry:Science
A natural glass with dull or pitchy luster and generally brown, green, or gray color. It is extremely rich in microscopic, embryonic crystal growths (crystallites) which may cause its dull appearance. The water content of pitchstone is high and generally ranges from 4 to 10% by weight. Only a small proportion of this is primary; most is believed to have been absorbed from the surrounding regions after the glass developed. Pitchstone is formed by rapid cooling of molten rock material (lava or magma) and occurs most commonly as small dikes or as marginal portions of larger dikes.
Industry:Science
A natural hydrated form of silica. Opal is a relatively common mineral in its nongem form, which is known as common opal and lacks the play of color for which gem, or precious, opal is known. All opal is of relatively simple chemical composition,SiO<sub>2</sub> · <i>n</i>H<sub>2</sub>O, in which SiO<sub>2</sub> represents silicon dioxide, and <i>n</i> represents a variable amount of water (H<sub>2</sub>O) that is housed in the internal structural arrangement of the mineral. The water content generally ranges from about 4 to 10 wt %, but it may be as high as 20 wt %. The hardness of opal on the Mohs hardness scale ranges from 5 to 6, the specific gravity from 2.25 to 1.99, and the refractive index from 1.455 to 1.435. Both specific gravity and refractive index decrease as a function of increasing water content.
Industry:Science
A natural mixture of corundum with magnetite or with hematite and spinel. Emery has been used for centuries as an abrasive or polishing material. Because the mixture is very intimate and appears to be quite homogeneous, it was considered to be a single mineral species until the middle of the nineteenth century. The aggregate has a gray-to-black color and is extremely tough and difficult to break. The specific gravity varies from 3.7 to 4.3, depending upon the relative amounts of the constituent minerals. The hardness is about 8 (Mohs scale), less than that of pure corundum which is 9, and is more dependent upon the physical state of aggregation than on the percentage of corundum.
Industry:Science
A natural or artificial conveyance through which liquid (typically water) having a free surface moves. The free surface is the interface with a gas (usually the atmosphere), along which the pressure is constant. The liquid is accelerated or decelerated in the flow direction due to an imbalance between the driving gravity force and the viscous boundary resistance force (friction). Such flows occur naturally in rivers, streams, and estuaries as a part of the hydrologic process of surface runoff and artificially in free-surface conduits for the transport of water for irrigation, water supply, drainage, flood control, and other useful purposes. In contrast to full pipe flow, the free surface introduces an additional freedom into the description of open-channel flow, which is the position of the free surface itself as it adjusts to the imposed flow conditions.
Industry:Science
