- 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 filtration process in which particles of colloidal size are retained by a filter medium while solvent plus accompanying low-molecular-weight solutes are allowed to pass through. Ultrafilters are used (1) to separate colloid from suspending medium, (2) to separate particles of one size from particles of another size, and (3) to determine the distribution of particle sizes in colloidal systems by the use of filters of graded pore size.
Industry:Science
A fine hair known to the American consumer chiefly in the form of high-quality coat fabrics. This textile fiber is obtained from the two-humped bactrian camel, which is native to all parts of Asia. The protective hair covering of the camel is a nonconductor of both heat and cold, also water repellent. In the spring the year's growth of hair, which hangs from the camel in matted strands and tufts, falls off in clumps. This growth, plus the masses of hair shed throughout the year, is the chief source of supply. The camel is sometimes plucked to obtain the down or underhair.
Industry:Science
A fine-grained fibrous variety of quartz, silicon dioxide. The individual fibers that compose the mineral aggregate usually are visible only under the microscope. Subvarieties of chalcedony recognized on the basis of color differences (induced by impurities), some valued since ancient times as semiprecious gem materials, include carnelian (translucent, deep flesh red to clear red in color), sard (orange-brown to reddish brown), and chrysoprase (apple green). Chalcedony sometimes contains dendritic enclosures resembling plants or trees. Major kinds of impurities that give color to chalcedony are iron oxides (carnelian and sard), nickel (chrysoprase), and manganese.
Industry:Science
A fine-grained, sugary-textured rock, generally of granitic composition; also any body composed of such rock.
Industry:Science
A finely divided material which contributes to optical and other properties of paint, finishes, and coatings. Pigments are insoluble in the coating material, whereas dyes dissolve in and color the coating. Pigments are mechanically mixed with the coating and are deposited when the coating dries. Their physical properties generally are not changed by incorporation in and deposition from the vehicle. Pigments may be classified according to composition (inorganic or organic) or by source (natural or synthetic). However, the most useful classification is by color (white, transparent, or colored) and by function.
Industry:Science
A fine-textured, dark-gray to black igneous rock composed mostly of plagioclase feldspar (labradorite) and pyroxene and exhibiting ophitic texture. It is commonly used for crushed stone. Its resistance to weathering and its general appearance make it a first-class material for monuments.
Industry:Science
A firm understanding of phylogenetic relationships is central to elucidating many evolutionary questions. However, assessing relationships in many groups requires the compilation and phylogenetic analysis of data sets of molecular and nonmolecular traits for numerous taxa. This is particularly true for many large groups of organisms (such as fungi, bacteria, insects, and green plants) for which relationships have remained obscure despite decades of study using traditional methods. The need for phylogenetic analysis of large data sets is not restricted to higher taxonomic groups, but may involve any portion of the taxonomic hierarchy, extending to the population level, or even to the level of strains of bacteria or viruses.
Industry:Science
A firm, resilient connective tissue of vertebrates and some invertebrates. Isolated pieces act as a skeleton to provide support and anchor muscles, or cartilage is with bone to contribute its resilience and interstitial growth to bony skeletal functions. Cartilage comprises a firm extracellular matrix synthesized by large, ovoid cells (chondrocytes) located in holes called lacunae. The matrix elements are water bound by the high negative charge of extended proteoglycan (protein-polysaccharide) molecules, and a network of fine collagen fibrils. The elements furnish mechanical stability, give, and tensile strength, but allow the diffusion of nutrients and waste to keep the cells alive. Generally, blood vessels reach only to the perichondrium of fibrous connective tissue, wrapping around the cartilage and attaching it to other tissues.
Industry:Science
A first or original model of hardware or software. Prototyping involves the production of functionally useful and trustworthy systems through experimentation with evolving systems. Generally, this experimentation is conducted with much user involvement in the evaluation of the prototype.
Industry:Science
A fish which is a member of the order Perciformes, family Scombridae. There are about 50 carnivorous species found in the middle layer or near the surface of tropical and temperate seas.
Industry:Science
