- 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 curve described by a body moving through space, as a meteor moving through the atmosphere, a planet around the Sun, a projectile fired from a gun, or a rocket in flight. In general, the trajectory of a body in a gravitational field is a conic section—ellipse, hyperbola, or parabola—depending on the energy of the motion. The trajectory of a shell or rocket fired from the ground is a portion of an ellipse with the Earth's center as one focus; however, if the altitude reached is not great, the effect of gravity is essentially constant, and the parabola is a good approximation.
Industry:Science
The internal structures and processes that are involved in the acquisition and use of knowledge, including sensation, perception, attention, learning, memory, language, thinking, and reasoning. These behaviors are studied by cognitive scientists, a group that includes, but is not limited to, researchers in the areas of cognitive psychology, philosophy, linguistics, computer science, and cognitive neuroscience. Cognitive scientists propose and test theories about the functional components of cognition based on observations of an organism's external behavior in specific situations.
Industry:Science
The component of an aircraft that provides the payload containment and the structural connection for the wing and the empennage (tail assembly). The fuselage and the wing are major structural components of an aircraft. The fuselage is the counting structure for the horizontal and tail surfaces that provides stability as well as the means of introducing pitch and yaw control to the aircraft. For some aircraft like fighter and private aircraft, the fuselage houses the engine or engines. The nose or tail gear and the main landing gear are often attached to the fuselage structure.
Industry:Science
The edible seed of more than a dozen species of evergreen cone-bearing trees in the genus <i>Pinus</i>, native to the temperate zone of the Northern Hemisphere. The important nut-producing species are the stone pine (<i>P. pinea</i>) of southern Europe; the Swiss stone pine (<i>P. cembra</i>), native to the Swiss Alps and eastward through Siberia to Mongolia; and the piñon pine (<i>P. cembroides</i> var. <i>edulis</i>) of the arid regions of the southwestern United States. The seeds or nuts, variable in size according to species, are borne in cones which take 3–4 years to develop.
Industry:Science
Systematic research in the field of hypersonic flight in the Earth's atmosphere began in the 1950s. This was due to the development of intercontinental ballistic missiles and the beginning of the space age. Understanding hypersonic flight required new theoretical concepts based on reliable experimental results. However, in the 1950s, scientists did not have data readily available to assist them in the aerodynamic design of high-velocity flying vehicles. As a result, various test facilities were built to reproduce specific features of hypersonic flight under ground-based conditions.
Industry:Science
The avoidance of inductive interference. Electric power systems, like almost everything run by electricity, depend on internal electric and magnetic fields; some of these fields find their way into the environment. The strongest of these fields can then induce voltages and currents in nearby devices and equipment and, in some cases, can interfere with the internal fields being used by electrical equipment in the vicinity. These induced voltages and currents, which are due to the coupling between the energized source and the electrical equipment, are called inductive interference.
Industry:Science
The Internet is now used to publish much primary (first disclosed) scientific information, particularly data. Protein sequences, genes, meteorological data, planetary information, and crystallographic data are now routinely deposited and managed on the Web. Top-quality data can be found almost instantly. In many disciplines, it is now a requirement of primary publication that data are electronically available. This has been made possible largely because of Hypertext Markup Language (HTML), which is used to create documents incorporating text, graphics, sound, video, and hyperlinks.
Industry:Science
The analysis of how ecosystem function is determined by the components of an ecosystem and how those components cycle, retain, or exchange energy and nutrients. Systems ecology typically involves the application of computer models that track the flow of energy and materials and predict the responses of systems to perturbations that range from fires to climate change to species extinctions. Systems ecology is closely related to mathematical ecology, with the major difference stemming from systems ecology's focus on energy and nutrient flow and its borrowing of ideas from engineering.
Industry:Science
The date palm (<i>Phoenix dactylifera</i>) is one of the oldest cultivated tree crops. It provides a staple food for many populations in the Middle East and North Africa, and also is highly valued for feed, fiber, and shelter. Beginning in the 1890s, the U.S. Department of Agriculture (USDA) plant collectors began importing date offshoots from Algeria, Tunisia, Egypt, and Iraq into the Salt River Valley in Arizona and then into the Coachella Valley in California, and the United States date industry was born. Date production and culture continue to challenge farmers around the world.
Industry:Science
The color of various insects, such as beetles and butterflies, in the natural world has attracted the attention of scientists since at least the time of Robert Hooke (1635–1703). Sir Isaac Newton (1642–1727) understood that the colors that are produced must be a result of the presence of “thin film structures.” It is now commonly recognized that the colors produced by insects and perceived by an observer are a result of the microstructures that are present on their bodies. In other words, the colors are produced by the interaction of light with the periodic structures on their bodies.
Industry:Science
