- 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.
The periodic movement of a population of animals, or a part of it, away from a region and their subsequent return to that region is termed migration. Migratory movements may be daily, as with fishes that move upward and downward in the water column; annual, as with many birds and mammals; or irregular, as with some salmon and fresh-water eels that may require a lifetime to complete the migration.
Industry:Science
The process by which the bulk chemical composition of a rock is changed from some previous state by the introduction of components from an external source. In contrast with metamorphism, where rocks are converted to a new set of minerals with little or no change in bulk composition, metasomatism involves the import and export of chemical components through the agency of a chemically active fluid.
Industry:Science
The study of chemical reactions of molecules in electronically excited states produced by the absorption of infrared (700–1000 nanometers), visible (400–700 nm), ultraviolet (200–400 nm), or vacuum ultraviolet (100–200 nm) light. Bond making and bond breaking as well as electron transfer and ionization are often observed in both organic and inorganic compounds as a consequence of such excitation.
Industry:Science
The principal water-conducting tissue and the chief supporting system of higher plants. This tissue and the associated phloem constitute the vascular system of vascular plants. Xylem is composed of various kinds of cells, living or nonliving. The structure of these cells differs in their functions, but characteristically all have a rigid and enduring cell wall that is well preserved in fossils.
Industry:Science
The saturation pressures exerted by vapors which are in equilibrium with their liquid or solid forms. One of the most important physical properties of a liquid, the vapor pressure, enters into many thermodynamic calculations and underlies several methods for the determination of the molecular weights of substances dissolved in liquids. For a discussion of the vapor pressure relationships of solids
Industry:Science
The methods required for the measurement of features of plant and animal populations or for quantifying energy flow or other aspects of ecological communities. Ecologists are concerned with such a wide range of variables that they may use many other techniques, including in particular those for the measurement of weather conditions or for determining features and composition of air, water, and soil.
Industry:Science
The skin is subject to localized and generalized disorders, as well as those of primary occurrence in the skin and those secondary to involvement of other tissue. Diseases and disorders may affect any of the structures of the skin. They may be caused by external agents, either infectious or noninfectious, or by the abnormal accumulation of normal or abnormal skin elements, either inborn or acquired.
Industry:Science
The term biomarker is a contraction of biological marker. Biomarkers are complex organic compounds composed of carbon, hydrogen, and other elements which are found in oil, bitumen, rocks, and sediments, and show little or no change in structure from their parent organic molecules in living organisms. Other terms that have been used synonymously with biomarker are molecular fossil and chemical fossil.
Industry:Science
Eine kalte Metallbearbeitung-Prozess in einem Presse-Typ Die. Coining wird verwendet, um geprägte Teile, wie Abzeichen und Medaillen und für die Prägung von Münzen zu produzieren. , Es wird auch auf Teile eines leeren oder Werkstück in Form Ecken, Einbuchtungen, oder Abschnitte, häufig als Teil eines Folgeverbundwerkzeuge-Vorgangs ausgelöst. Die Arbeit ist zu hohem Druck in die Kavität sterben ausgesetzt und dadurch gezwungen, die sterben Details plastisch zu fließen. Ohne Überlauf zuviel Metall zwischen den Gesenken ist charakteristisch für die Prägung und ist verantwortlich für die feinen Details erreicht. Jedoch, da diese Aktion sehr genaue stirbt und höher als üblich sterben Druck erforderlich ist, nur wesentliche Flächen geprägt sind.
Industry:Science
The path of information travel, usually from one electrical system to another, in which light acts as the information carrier and is propagated by total internal reflection through a transparent optical waveguide. An electrooptic modulator and an optoelectric demodulator are required to convert the electrical signals into light and back again at the transmit and receive ends of the link, respectively.
Industry:Science
