- 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.
A system of sound recording or transmission in which signals are captured, mixed, or synthesized using two or more audio channels in such a way as to deliver a spatial or three-dimensional auditory impression to a listener when these audio channels are connected to loudspeakers in a listening room. Binaural or “head related” stereo is a term used to describe the capture or synthesis of a pair of signals that closely resemble those present at a listener's ears in a natural spatial sound field. Such signals are intended for reproduction using a pair of headphones worn by the listener, although they can be reproduced using loudspeakers if suitable signal processing is employed.
Industry:Science
A system of symbols and notation for the chemical elements and the combinations of these elements which form numerous chemical compounds. This system of symbols, devised since about 1800 by chemists, consists of letters, numerals, and marks that are designed to denote the chemical element, formula, or structure of the molecule or compound. These symbols give a concise and instantly recognizable description of the element or compound. In many cases, through the efforts of international conferences, the symbols are recognized throughout the scientific world, and they greatly simplify the universal languge of chemistry.
Industry:Science
A system of vessels in the vertebrate body, beginning in a network of exceedingly thin-walled capillaries in almost all the organs and tissues except the brain and bones. This network is drained by larger channels, mostly coursing along the veins and eventually joining to form a large vessel, the thoracic duct, which runs beside the spinal column to enter the left subclavian vein at the base of the neck.
The lymph fluid originates in the tissue spaces by filtration from the blood capillaries. While in the lymphatic capillaries, it is clear and watery. However, at intervals along the larger lymphatic vessels, the lymph passes through spongelike lymph nodes, where it receives great numbers of cells, the lymphocytes, and becomes turbid. The lymphatic vessels other than capillaries contain numerous valves preventing backflow of the lymph. The functions of the lymphatic system are to remove particulate materials such as molecular proteins and bacteria from the tissues, to transport fat from the intestine to the blood, and to supply the blood with lymphocytes.
Industry:Science
A system on chip (SOC) is a monolithic unit that performs a complex function, such as a personal computer, radar receiver, or cellular phone. Systems on chip are assembled using high-level components, such as processors, controllers, and memory arrays. The communication scheme among these components is key to delivering the desired performance within the prescribed energy consumption budget. For this reason, a large research effort is addressing the design and optimization of on-chip communication. Techniques borrowed from networking technologies are carried over to microelectronic design but have to cope with the advantages and limitations of the manufacturing technology for integrated circuits.
Industry:Science
A system that amplifies or enhances the sound of a speaking person, singer, or musical instrument. Sound-reinforcement systems are used to increase the clarity of the original sound as well as to add loudness and reverberation. Those that improve loudness and clarity are often called public address systems, and those that improve reverberation characteristics are called reverberation enhancement systems. Systems for increased loudness are used when listeners are located far from the sound source, as in a large audiorium or outdoors. Systems for increased clarity are used to overcome the effects of unwanted noise or excessive reverberation in a room (such as concert halls and churches with reverberation characteristics designed for music). Reverberation enhancement systems are used to add sound field components, such as reverberation to rooms having unsuitable levels of direct, early reflected sound and reverberant sound or having short reverberation times.
Industry:Science
A system that gives a name to each day. These day names are generally distinct, but not always. For example, the day of the week is a calendar, in a trivial sense, with infinitely many days having the same day name. The design of calendars has been driven by human needs varying over millennia, so the study of calendars is intricately bound to history, astronomy, and religion. Ancient calendars were based on simple observations of phenomena such as the waxing and waning of the Moon, the change in seasons, or the movement of heavenly bodies. Because observational methods suffer from the vagaries of weather and chance, modern calendars tend to be based solely on arithmetical rules, distanced from their motivation in nature.
Industry:Science
A system that provides control of location and attitude of spacecraft by using rocket engines to generate motion. Spacecraft propulsion systems come in various forms depending on the specific mission requirements. Each exhibits considerable variation in such parameters as thrust, specific impulse, propellant mass and type, pressurization schemes, cost, and materials. All of these variables must be considered in deciding which propulsion system is best suited to a given mission. Typical spacecraft applications include communications satellites, science and technology spacecraft, and Earth-monitoring missions such as weather satellites. Orbital environments range from low-Earth to geosynchronous to interplanetary.
Industry:Science
A system that receives and processes television signals, as well as other digital forms of communications such as those related to high-speed Internet connectivity and cable telephony, from various sources and retransmits these signals through coaxial or optical-fiber (or fiber-optic) cables to subscribers' homes. The sources of the signals include broadcast transmissions, satellite-delivered programming, and local television studio productions. The facility that receives, processes, and retransmits the signals is called a headend.
Industry:Science
A system that supports technological and managerial decision making by assisting in the organization of knowledge about ill-structured, semistructured, or unstructured issues. A structured issue has a framework comprising elements and relations between them that are known and understood. Structured issues are generally ones about which an individual has considerable experiential familiarity. A decision support system (DSS) is not intended to provide support to humans about structured issues since little cognitively based decision support is generally needed for these experientially familiar situations. Artificial-intelligence based expert systems are very appropriate for these tasks.
Industry:Science
A system utilizing nuclear fission in a controlled and self-sustaining manner. Neutrons are used to fission the nuclear fuel, and the fission reaction produces not only energy and radiation but also additional neutrons. Thus a neutron chain reaction ensues. A nuclear reactor provides the assembly of materials to sustain and control the neutron chain reaction, to appropriately transport the heat produced from the fission reactions, and to provide the necessary safety features to cope with the radiation and radioactive materials produced by its operation.
Industry:Science
