- 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 luminous intensity of any surface in a given direction per unit of projected area of the surface viewed from that direction. The International Commission on Illumination defines it as the quotient of the luminous intensity in the given direction of an infinitesimal element of the surface containing the point under consideration, by the orthogonally projected area of the element on a plane perpendicular to the given direction. Simply, it is the luminous intensity per unit area. Luminance is also called photometric brightness.
Industry:Science
The study of the flow and deformation of biological materials. As all living things flow and deform, biorheology is involved in the study of every aspect of biology. The behavior and fitness of living organisms depend partly on the mechanical properties of their structural materials. Humans are healthy when the rheological properties of their tissues are normal; deviations lead to illness. For example, a thinner than normal fluid in the knee joint results in pain and arthrosis, and softened or weakened bones result in fractures.
Industry:Science
The planning, design, construction, and operation and maintenance of facilities providing for the landing and takeoff, loading and unloading, servicing, maintenance, and storage of aircraft. Facilities at airports are generally described as either airside, which commences at the secured boundary between terminal and apron and extends to the runway and to facilities beyond, such as navigational or remote air-traffic-control emplacements; or landside, which includes the terminal, cargo-processing, and land-vehicle approach facilities.
Industry:Science
The process by which the complex organic molecules in foods are broken down into simpler units which can be utilized by cells for energy or incorporated into living protoplasm. Frequently, there is an essential mechanical pretreatment of the food, either before or after it is taken into the body. Mechanical treatment is especially needed in herbivorous animals that depend on the utilization of cellulose and other plant materials, or where the prey has a hard exoskeleton. Many animals have devices for crushing, grinding, or mixing.
Industry:Science
The study of cancer. There are five major areas of oncology: etiology, prevention, biology, diagnosis, and treatment. As a clinical discipline, it draws upon a wide variety of medical specialties; as a research discipline, oncology also involves specialists in many areas of biology and in a variety of other scientific areas. The approach to the study of cancer is multidisciplinary because cancer is a fundamental problem in biology. Oncology has led to major progress in the understanding not only of cancer but also of normal biology.
Industry:Science
The study of the direction and intensity of the Earth's magnetic field through geologic time. Paleomagnetism is an important tool in measuring the past movements of the Earth's tectonic plates. By studying ancient magnetic field directions recorded in rocks, scientists learn how the plates moved relative to the Earth's spin axis and relative to one another. The calibrated history of geomagnetic polarity reversals provides a basis for the temporal correlation of rocks on a local to global geographic scale, called magnetostratigraphy.
Industry:Science
The study of organisms of the fungal lineage, including mushrooms, boletes, bracket or shelf fungi, powdery mildew, bread molds, yeasts, puffballs, morels, stinkhorns, truffles, smuts, and rusts. Fungi, in the traditional sense, are an ecological grouping of organisms found in every ecological niche. Mycologists estimate that there are 1.5 million species of fungi, with only 70,000 species now described. Fungi typically have a filamentous-branched somatic structure surrounded by thick cell walls; these structures are known as hyphae.
Industry:Science
The systematic application of engineering and scientific disciplines to the exploration and utilization of outer space. Since 1957, space satellites and probes have been launched beyond the Earth's atmosphere to orbit the Earth (velocity of 7 km/s or 4.4 mi/s) or to escape from it (velocity 11 km/s or 6.9 mi/s). Due to the severe environmental conditions in space, such as high vacuum, intense solar radiation, and extremes of temperature, a variety of disciplines are required to design, build, test, and launch a successful spacecraft.
Industry:Science
The range of the electromagnetic spectrum located either above (the upper sideband) or below (the lower sideband) the frequency of a sinusoidal carrier signal <i>c</i>(<i>t</i>). The sidebands are produced by modulating the carrier signal in amplitude, frequency, or phase in accordance with a modulating signal <i>m</i>(<i>t</i>) to produce the modulated signal <i>s</i>(<i>t</i>). The resulting distribution of power in the sidebands of the modulated signal depends on the modulating signal and the particular form of modulation employed.
Industry:Science
The sum of the atomic weights of all atoms making up a molecule. Actually, what is meant by molecular weight is molecular mass. The use of this expression is historical, however, and will be maintained. The atomic weight is the mass, in atomic mass units, of an atom. It is approximately equal to the total number of nucleons, protons and neutrons, composing the nucleus. Since 1961 the official definition of the atomic mass unit (amu) has been that it is 1/12 the mass of the carbon-12 isotope, which is assigned the value 12.000 exactly.
Industry:Science
