- 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.
One of a group of compounds that contain both selenium (Se) and carbon (C) and frequently other elements as well, for example, halogen, oxygen (O), sulfur (S), or nitrogen (N). The first examples of organoselenium compounds were reported shortly after the discovery of elemental selenium by J. J. Berzelius in 1818. Their exceptionally unpleasant and persistent odors may have discouraged early investigators. However, less volatile derivatives containing aryl substituents or selenium in higher oxidation states are more easily handled.
Industry:Science
Inflammation of the meninges. Diagnosis of meningitis is made from examination of a specimen of cerebrospinal fluid that is found in the subarachnoid space. The fluid sample is obtained by lumbar puncture (spinal tap) or, less commonly, by a ventricular tap, which requires passage of a needle into the brain tissue. Certain types of meningitis are associated with distinctive abnormalities in the cerebrospinal fluid. With certain types of meningitis, especially bacterial, the causative organism can usually be recovered from the fluid.
Industry:Science
Resonant ionization mass spectrometry (RIMS) is an emerging analytical technique that can accomplish very sensitive and unambiguous identification of elemental impurities in bulk materials, on surfaces, and in particulates. Because the technique combines high sensitivity and selectivity, the concentration of various contaminants may be determined at and below the part-per-billion (ppb) level. Moreover, such determinations can be quantitative even in complex matrices, and concentration maps at high lateral resolution have been obtained.
Industry:Science
Primates are our closest biological relatives. Therefore, we expect to find many similarities between primate and human communication. Primates primarily use vocal and visual modalities, as do humans, and some primate communication demonstrates impressive complexity. Nonetheless, primate communication differs from human communication, especially language, in important ways. This article focuses on natural communication processes in primates rather than artificial training to use sign language or computer symbols to mimic human language.
Industry:Science
Multiple agents and stressors can interact in a given community to adversely affect human and ecological conditions. A cumulative risk assessment (CRA) analyzes, characterizes, and potentially quantifies the effects from multiple stressors, which include chemical agents (for example, benzene) as well as biological (for example, vector-borne illness), physical (for example, housing characteristics), and psychological (for example, socioeconomic) ones. The distinguishing feature of a CRA is an analysis of combined effects and interactions.
Industry:Science
Nondestructive testing (or nondestructive evaluation) is often used to determine whether a newly manufactured product meets acceptable quality standards established by the producer. In the past, success in identifying defects by such testing has caused conflict between inspectors and management because of lower overall production yield. In recent years, management has found that using nondestructive testing during manufacturing can improve quality during the fabrication process and enhance yield by providing process feedback and control.
Industry:Science
It is generally accepted that vehicles (cars, aircraft, trains) are tested before being released for public use, both by the manufacturers and on occasion by the appropriate regulatory authorities to “certify” the vehicle. These tests are often major undertakings; for example, the crash of a car into a barrier at motorway speeds or the test to failure of an aircraft wing. The tests are instrumented, with cameras to record the event, strain gauges to measure material deformation, and load cells to track the forces applied to the structure.
Industry:Science
Mammals that exhibit social behavior. This may be defined as any behavior stimulated by or acting upon another animal of the same species. In this broad sense, almost any animal which is capable of behavior is to some degree social. Even those animals which are completely sedentary, such as adult sponges and sea squirts, have a tendency to live in colonies and are social to that extent. Social reactions are occasionally given by species other than the animals' own; an example would be the relations between domestic animals and humans.
Industry:Science
Miniature electronic circuits produced within and upon a single semiconductor crystal, usually silicon. Integrated circuits (ICs) range in complexity from simple logic circuits and amplifiers, about 1.3 mm (0.05 in.) square, to very large scale integrated circuits (VLSI), up to about 25 mm (1 in.) square. They can contain over 10<sup>9</sup> transistors and other components that provide computer memory circuits and complex logic subsystems such as microcomputer central processor units (microprocessors) and digital signal processing (DSP).
Industry:Science
Infections acquired during a hospital stay; also known as nosocomial infections. They may be recognized during or after hospitalization. They usually appear during hospitalization, but as many as 25% of infections related to surgery occur after discharge. Data suggest that in the United States 4.5% of all hospitalized patients can expect at least one such infection, which translates into almost 2 million infections annually. Thus this major public health problem accounts for 299 million patient-days in United States hospitals each year.
Industry:Science
