- 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.
Electric fields are used to accelerate, redirect, or stop electrons in nearly all modern semiconductor devices. However, there are a number of other ways of altering the motion of electrons in semiconductors, such as with magnetic fields or temperature gradients. The use of local magnetic fields to control the motion of charge carriers will initiate new areas of fundamental research, and may have applications in microelectronics in the future.
Industry:Science
Environments such as lakes, caves, or mountaintops provide fascinating opportunities for studying evolution in isolation and determining rates and modes of evolutionary processes. Lying in the Great Rift Valley of Central Africa, Lake Tanganyika is such an evolutionary marvel. Tanganyika is one of the oldest, largest, and deepest lakes in the world. It is also a hot spot of biological diversity, harboring hundreds of species found nowhere else.
Industry:Science
Conventional fuels such as gasoline and diesel are gradually being replaced by alternative fuels such as gaseous fuels (natural gas and propane), alcohol (methanol and ethanol), and hydrogen. Conventional fuels can also be modified to a reformulated gasoline to help reduce toxic emissions. Technological advances in the automotive industry (such as in fuel cells and hybrid-powered vehicles) are helping to increase the demand for alternative fuels.
Industry:Science
Effects on development that are attributable specifically to the maternal parent or to maternally inherited factors. This influence can take a variety of forms, including maternal-specific inheritance of genetic material (for example, mitochondrial DNA), parent-specific epigenetic modification of genes (genomic imprinting), placement of molecules into the oocyte prior to fertilization, and interactions with the maternal parent during development.
Industry:Science
Computer networks that usually cover a limited range, say, within the boundary of a building. A computer network is two or more computers that communicate with each other through some physical medium. The primary usage of local-area networks (LANs) is the sharing of hardware, software, or information, such as data files, multimedia files, or electronic mail. Resource sharing provided by local-area networks improves efficiency and reduces overhead.
Industry:Science
Combination of a rope or other flexible material and independently rotating frictionless pulleys; the pulleys are grooved or flat wheels used to change the direction of motion or application of force of the flexible member (rope or chain) that runs on the pulleys. As in a lever, the summation of torques about the axis of rotation of the pulley equals zero for static equilibrium. Tension <i>T</i> in the rope is the same on both sides of the pulley.
Industry:Science
Cyclic nucleotides, derivatives of nucleic acids, control the activity of several proteins within cells to regulate and coordinate metabolism. They are members of a group of molecules known as intracellular second messengers; their levels are regulated by hormones and neurotransmitters, which are the extracellular first messengers in a regulatory pathway. Cyclic nucleotides are found naturally in living cells, from bacteria, to yeast, to human cells.
Industry:Science
Diseases caused by <i>Salmonella</i>. These include enteritis (90–95% of all salmonelloses in the United States) and septicemia with or without enteritis (5–10%). <i>Salmonella typhi</i>, <i>S</i>. <i>paratyphi A</i>, <i>B</i>, and <i>C</i>, and occasionally <i>S</i>. <i>cholerae suis</i> cause particular types of septicemia called typhoid and paratyphoid fever, respectively; while all other types may cause enteritis or septicemia, or both together.
Industry:Science
Elementary mechanical parts used as building blocks for the construction of most devices, apparatus, and machinery. The gradual development of these building blocks, following the invention of the roller or wheel and the arm or lever in ancient times, brought about the Industrial Revolution, starting with the assembly of James Watt's engine for harnessing the force of steam and proceeding into the advanced mechanization of present automatic control.
Industry:Science
Categories of land resources that provide information about uses and characteristics. In combination with geographic location systems, measurements of the amount of land in use, the amount available for development, and the changes in use over time, decisions about land use can be accurately made. Concerns develop when a certain land quality is required for a specific purpose, such as food production, human living areas, or environmental protection.
Industry:Science
