- 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 carbonate mineral CaMg(CO<sub>3</sub>)<sub>2</sub>. Often small amounts of iron, manganese, or excess calcium replace some of the magnesium; cobalt, zinc, lead, and barium are more rarely found. Dolomite merges into ankerite with increasing substitution of iron for magnesium, and into kutnahorite with increasing manganese substitution.
Industry:Science
The extraction of lead from ore, its subsequent purification and processing, and its alloying with other metals to achieve desired properties. Possibly the oldest metal known, lead was particularly attractive to alchemists, predecessors of today's metallurgists and chemists, as a substance which they believed could be transformed into gold.
Industry:Science
The device that couples the transmitter or receiver network of a radio system to space. Radio waves are used to transmit signals from a source through space. The information is received at a destination which in some cases, such as radar, can be located at the transmitting source. Thus, antennas are used for both transmission and reception.
Industry:Science
The division of engineering concerned with the environment and management of natural resources. The environmental engineer places special attention on the biological, chemical, and physical reactions in the air, land, and water environments and on improved technology for integrated management systems, including reuse, recycling, and recovery measures.
Industry:Science
The discipline that addresses the activities that a system, software, or an organization must perform to achieve its desired outputs; that is, what transformations are necessary to turn the available inputs into the desired outputs. Additional considerations include the flow of data or items between functions, the processing instructions that are available to guide the transformations, and the control logic that dictates the activation and termination of functions. Functional analysis diagrams have been developed to capture some or all of these concepts.
Industry:Science
The extraction of ore from beneath the surface of the ground. Underground mining is also applied to deposits of industrial (nonmetallic) minerals and rocks, and underground or deep methods are used in coal mining. Some ores and industrial minerals can be recovered from beneath the ground surface by solution mining or in-place leaching using boreholes.
Industry:Science
The application of chemistry to the study of physical materials or theoretical problems, the results of which may be entered into court as technical evidence. Forensic chemistry is part of the broader field of forensic science. The boundaries of forensic chemistry are not sharply defined, and topics that are not entirely chemical in nature are included. The scope of the analyses performed depends on the criminal, civil, and regulatory statutes of a given jurisdiction. A forensic chemist may be asked to examine debris from a fire scene for the presence of accelerant residues, to determine the species of an imported animal product for ad valorem tax classification, to demonstrate the presence of a narcotic in a pill, or to determine if a certain tool made a scratch on an illegally entered door.
Industry:Science
The common name used for 15 species of large reptiles included in the family Crocodylidae, one of the three families of the order Crocodylia, which also includes the alligators, caimans, and gharials (also known as gavials). Like all crocodilians, the crocodiles are distributed throughout the tropical and subtropical regions of the world. Species occur in both saltwater and freshwater habitats. Crocodiles are generally carnivorous, feeding on invertebrates, fish, other reptiles, amphibians, birds, and mammals. A few, very narrow snouted species are believed to subsist primarily on fish. Crocodiles are primarily aquatic and nocturnal, leaving the water only to bask by day or to build their nests. Some species construct burrows into the banks of rivers or lakes where they spend part of their time.
Industry:Science
The interaction which occurs when a hydrogen atom, covalently bonded to an electronegative atom (as in A–H), interacts with another atom to form the aggregate A–H…Y. The shortest and strongest bond is indicated as A–H, while the secondary and weaker interaction is written as H…Y. Thus A–H is a proton donor, while (Y) is a proton acceptor which often contains lone pair electrons and can act as a base. The strongest hydrogen bonds are formed between the most electronegative (A) atoms such as fluorine, nitrogen, and oxygen which interact with (Y) atoms having electronegativity greater than that of hydrogen (C, N, O, S, Se, F, Cl, Br, I). The weakest of hydrogen bonds are formed by acidic protons of C–H groups, as in chloroform and acetylene, and by olefinic and aromatic π-electrons acting as (Y).
Industry:Science
The bombardment of solid surfaces by fast neutral or ionized particles has been of interest for more than 100 years. This interest stems from the many important applications that depend on these processes. For example, electron emission initiated by particle impact on a converter surface permits detection of very small particle currents or even single-particle counting for highly sensitive mass spectrometry. Sputtering, that is, the removal of atomic constituents from a solid because of particle impact, is highly important in many fields, including space flight, thermonuclear fusion research, and semiconductor technology. Radiation damage in solids, which is caused by the impact of energetic particles, can, for example, be utilized in light-ion radiotherapy for the destruction of cancerous tissue.
Industry:Science
