- 行业: Printing & publishing
- Number of terms: 178089
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- 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.
Many engineering devices, such as jet engines, helicopters, cooling fans, and wind turbines, generate sound as a result of the flow of air. Aeroacoustics is the study of this aerodynamic noise. The ultimate goal of aeroacoustics is the development of reliable predictive models that enable noise-reduction strategies to be identified and that allow noise to be accurately factored into engineering, environmental, and economic decisions.
Industry:Science
Interference with the audibility of a sound caused by the presence of another sound. More specifically, the number of decibels (dB) by which the intensity level of a sound (signal) must be raised above its threshold of audibility, to be heard in the presence of a second sound (masker), is called the masking produced by the masker on the signal. The masker and the signal may be identical or may differ in frequency, complexity, or time.
Industry:Science
Methods for reducing solid waste by reusing discarded materials. Essentially, recycling is a three-part process that uses waste materials to make new products. The three integral phases involve the collection of recyclable materials, manufacture or reprocessing of recyclable materials into new products, and purchase of recycled-content products. Various techniques have been developed to recycle plastics, glass, metals, paper, and wood.
Industry:Science
Recent events worldwide have radically changed how security is viewed in the transportation environment. Previously, most transportation security operations were concerned with vandalism and theft. Now they focus on preventing terrorist attacks and mitigating the potential consequences of such attacks. A broad range of conventional and innovative technologies are being applied to address such threats and improve transportation security.
Industry:Science
Mast cells normally are present within all tissues in humans and other mammals. They may be especially numerous beneath the surfaces of the skin, the respiratory system, and the gastrointestinal and genitourinary tracts. This distribution places mast cells near the sites of entry of parasites, bacteria, and other pathogenic organisms, as well as near surfaces that are exposed to environmental antigens (such as those derived from pollen).
Industry:Science
In psychology, resilience refers to positive adaptation among individuals at risk for maladjustment. It is characterized either by positive adjustment following experiences of adversity or by recovery from initial maladjustment. Resilience research is the study of the processes that foster positive adaptation. The goal of this research is to enhance the lives of individuals at risk by informing interventions and influencing social policy.
Industry:Science
In meteorology, an extensive body of the atmosphere which is relatively homogeneous horizontally. An air mass may be followed on the weather map as an entity in its day-to-day movement in the general circulation of the atmosphere. The expressions air mass analysis and frontal analysis are applied to the analysis of weather maps in terms of the prevailing air masses and of the zones of transition and interaction (fronts) which separate them.
Industry:Science
Lasers are an integral part of today's health care delivery system. They are used in the laboratory analysis of human blood samples; serve as surgical tools that kill, burn, or cut tissue; and are used in ophthalmology to weld torn retinas. Semiconductor microtechnology has reduced the diameter of a laser to a fraction of a human hair to create micro-electro-mechanical systems (MEMS). MEMS devices are expected to advance health care delivery.
Industry:Science
Methods and techniques for constructing human-machine systems with specialized problem-solving expertise. The pursuit of this area of artificial intelligence research has emphasized the knowledge that underlies human expertise and has simultaneously decreased the apparent significance of domain-independent problem-solving theory. In fact, a new set of principles, tools, and techniques have emerged that form the basis of knowledge engineering.
Industry:Science
Proper motion of an astronomical object apparently exceeding the velocity of light, <i>c</i>. This phenomenon is relatively common in the nuclei of quasars, many of which exhibit systematic changes in images of their radio-frequency emission over periods of months to years. In some cases, features in the image appear to separate at a speed inferred to be more than 10 times the speed of light, given the great distance of the quasars from Earth.
Industry:Science
