- 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 well-indurated dark gray sandstone that is characterized by abundant dark-colored detrital rock fragments and more than 15% clay matrix minerals between sand grains. Graywacke sands were deposited chiefly in marine basins near the edge of continental margins where plate subduction was taking place. Subsequent compressional deformation and uplift of rocks in the sedimentary basins results in the occurrence of most graywackes in Alpine-type (compressional) mountain ranges.
Industry:Science
A wheeled, self-propelled vehicle for hauling other vehicles or equipment and for operating the towed implements; also, a crawler which runs on an endless, self-laid track and performs similar functions.
Industry:Science
A wide variety of analytic techniques in which the distribution and precise nature of the scattered light carry information about the object from which it was scattered. Light-scattering techniques are used for studying and characterizing particles ranging from nanometer to millimeter sizes.
Industry:Science
A wide variety of biological evidence, ranging from fossils to DNA, indicates that living monkeys, apes, and humans share a common ancestry that excludes all other organisms, including other primates. Known collectively as anthropoids, these “higher” primates differ from their living prosimian relatives (lemurs, lorises, bushbabies, and tarsiers) in many key features of anatomy, physiology, and behavior. Until recently, the fossil record has only weakly illuminated the wide gulf separating living anthropoids and prosimians.
As a result, one of the largest remaining gaps in knowledge of primate evolution concerns the origin and early diversification of anthropoids. Novel paleontological discoveries are finally beginning to resolve the long-standing issue of exactly how anthropoids fit on the primate evolutionary tree. Newly discovered fossils are also leading to unexpected insights regarding the paleobiology of the earliest anthropoids. These new findings are threatening to overturn an earlier consensus about when and where anthropoids originated.
Industry:Science
A wide variety of products are manufactured by the glass industry, such as optical lenses, glass plates, windshields, preforms for drawing optical fibers used in telecommunications, fiberglass, and various consumer products. Glass is produced in melting furnaces or tanks, in which combustion of fossil fuels or electrical heating results in the melting of the raw materials or batch. The molten glass flows out of the melting tank through a glass delivery system for further processing. This transfer of molten glass may be driven by gravity, and as the molten glass is poured into molds or casts or other enclosures, the glass stream may “neck down” and form a gravity-driven viscous jet.
Industry:Science
A wide variety of relatively heavy machines which perform specific construction (or demolition) functions under power. The power plant (which is treated in later paragraphs) is commonly an integral part of an individual machine, although in some cases it is contained in a separate prime mover, for example, a towed wagon or roller. It is customary to classify construction machines in accordance with their functions such as hoisting, excavating, hauling, grading, paving, drilling, or pile driving. There have been few changes for many years in the basic types of machines available for specific jobs, and few in the basic configurations of those that have long been available. Design emphasis for new machines is on modifications that increase speed, efficiency, and accuracy (particularly through more sophisticated controls); that improve operator comfort and safety; and that protect the public through sound attenuation and emission control. The selection of a machine for a specific job is mainly a question of economics and depends primarily on the ability of the machine to complete the job efficiently, and secondarily on its availability.
Industry:Science
A widely dispersed reptile belonging to the family Scincidae. The family contains approximately 1200 species and is represented on every continent except Antarctica. There are over 150 species of skink in Australia alone. Characteristics include elongate bodies, moderate to long tails, and proportionately short, reduced, or absent limbs. Some scales on the head and body have cores of bone. In many species the eyelids are transparent. Skinks exhibit pleurodont dentition; that is, the teeth are attached on the side of the jaw.
Industry:Science
A widely distributed group of soft-bodied marine organisms that are preserved as fossils in rocks of latest Proterozoic age (600–543 million years ago; Ma). The biota characterizes a geological period, known as the Ediacarian or the Vendian, which precedes the widespread appearance of animals with mineralized skeletons. The name Ediacara refers to an abandoned mining area about 380 mi (600 km) north of Adelaide, South Australia.
Industry:Science
A widely used cloth made from flax fibers. Linen is noted for its evenness of thread, fineness, and density. Its uses include garments, tablecloths, sheeting, towels, and thread.
Industry:Science
A widespread order of lilioid monocotyledons composed of four or five families, the most important of which is Dioscoreaceae (650 species). These families contain some of the most peculiar plants among the monocots. Two families, Thismiaceae and Burmanniaceae (with 35 and 140 species, respectively), are largely composed of nonphotosynthetic herbaceous species that parasitize fungi, whereas other members, such as the bat plant (<i>Tacca</i>, Taccaceae) and the yams (<i>Dioscorea</i>) have net-veined leaves similar to dicots. Most of the 600 species of <i>Dioscorea</i> are vines, and all contain diosgenin, a precursor of progesterone and cortisone, leading to their being commercially collected in some parts of the world.
Industry:Science
