- 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.
Recent developments in forestry have included the establishment and investigation of mixed- and single-species plantations of trees, and the evolution of sustainable harvesting in tropical forests in order to meet the needs of future generations, as well as the present.
Industry:Science
Magnetoelectronics, also known as spin electronics or spintronics, has developed rapidly since the discovery of giant magnetoresistance and tunneling magnetoresistance in the late 1980s. Both effects are based on the spin of the electron, and its use in electronic devices.
Industry:Science
One of the three major classes of basic food substances, the others being protein and carbohydrate. Fats and oils are a source of energy. They also aid in making both natural and prepared foods more palatable by improving the texture and providing a more desirable flavor.
Industry:Science
Methods based on the principle that, among all possible configurations or histories of a physical system, the system realizes the one that minimizes some specified quantity. Variational methods are used in physics both for theory construction and for calculational purposes.
Industry:Science
One of the four subclasses of Mammalia, containing a single order, the Multituberculata. The Allotheria first appeared in the Late Jurassic and survived well into the Cenozoic, a period of at least 100,000,000 years. Fossils are known from North America, Europe, and Asia.
Industry:Science
Sedimentary rock containing more than 50% by weight of the mineral dolomite (CaMg(CO<sub>3</sub>)<sub>2</sub>). The term dolostone is used synonymously. A range of the Alps in northeastern Italy is named the Dolomites because it is composed predominantly of dolomite rock.
Industry:Science
James Clerk Maxwell and his contemporaries in the nineteenth century found it inconceivable that a wave motion should propagate in empty space. They therefore postulated a medium, which they called the ether, that filled all space and transmitted electromagnetic vibrations.
Industry:Science
Nutrient-poor, acid peatlands with a vegetation in which peat mosses (<i>Sphagnum</i> spp.), ericaceous dwarf shrubs, and to a lesser extent, various sedges (Cyperaceae) play a prominent role. The terms muskeg, moor, heath, and moss are used locally to indicate these sites.
Industry:Science
Radioactivity that originates from natural and anthropogenic sources, including radioactive materials in food, housing, and air, radioactive materials used in medicine, nuclear weapon tests in the open atmosphere, and radioactive materials used in industry and power generation.
Industry:Science
One of the 88 areas into which the sky is divided. Each constellation has a name that reflects its earliest recognition. Though pictures are associated with the constellations, they have no official status, and constellations have been depicted differently by different artists.
Industry:Science
