- 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.
The monoclinic sodium aluminum pyroxene, NaAlSi<sub>2</sub>O<sub>6</sub>. Free crystals are rare. Jadeite usually occurs as dense, felted masses of elongated blades or as fine-grained granular aggregates. It has a Mohs hardness of 6.5 and a density of 3.25–3.35. It has a vitreous or waxy luster, and is commonly green but may also be white, violet, or brown. Jadeite exhibits the 93° and 87° pyroxene cleavages and a splintery fracture. It is extremely tough.
Industry:Science
The term light, as commonly used, refers to the kind of radiant electromagnetic energy that is associated with vision. In a broader sense, light includes the entire range of radiation known as the electromagnetic spectrum. The branch of science dealing with light, its origin and propagation, its effects, and other phenomena associated with it is called optics. Spectroscopy is the branch of optics that pertains to the production and investigation of spectra.
Industry:Science
The study and application of topological transformation groups. Topological dynamics originated in the late-nineteenth-century investigations of the qualitative behavior of the solutions to the differential equations of classical mechanics by Henri Poincaré. The emergence of topological dynamics as a mathematical discipline occurred in the twentieth century with an abstract formulation of certain qualitative features of the classical systems by G. D. Birkhoff.
Industry:Science
The star α Canis Majoris, also referred to as the Dog Star, the brightest of all the stars in the night sky (apparent magnitude −1.47). Sirius owes its apparent brightness both to its close distance to Earth, only 2.64 parsecs (8.14 × 10<sup>13</sup> km or 5.06 × 10<sup>13</sup> mi), and to its intrinsic luminosity, which is more than 20 times that of the Sun. It is a main-sequence star of spectral type A1 with an effective temperature of about 9400 K (16,500°F).
Industry:Science
The process of forming a thrombus, which is a solid mass or plug in the living heart or vessels composed of the constituents of the blood. Thrombosis usually occurs in a diseased blood vessel, as a result of arteriosclerosis. The consequences of thrombosis include local obstruction causing both tissue death and hemorrhage. Thrombosis is a significant factor in the death of an individual affected by arteriosclerotic cardiovascular disease, malignancy, and infection.
Industry:Science
The science concerned with the chemistry of cells. Specifically, the macromolecules of subcellular structures can be treated chemically to form microsopically visible end products. For example, proteins, enzymes, lipids, carbohydrates, and nucleic acids can be directly visualized in cell nuclei, membranes, and organelles by cytochemical methods which generate images that can be viewed by either bright field or light, fluorescence, confocal, or electron microscopes.
Industry:Science
The sudden movement of the Earth caused by the abrupt release of accumulated strain along a fault in the interior. The released energy passes through the Earth as seismic waves (low-frequency sound waves), which cause the shaking. Seismic waves continue to travel through the Earth after the fault motion has stopped. Recordings of earthquakes, called seismograms, illustrate that such motion is recorded all over the Earth for hours, and even days, after an earthquake.
Industry:Science
The term used to describe a continuing periodic change in the magnitude of a displacement with respect to a specified central reference. The periodic motion may range from the simple to-and-fro oscillations of a pendulum, through the more complicated vibrations of a steel plate when struck with a hammer, to the extremely complicated vibrations of large structures such as an automobile on a rough road. Vibrations are also experienced by atoms, molecules, and nuclei.
Industry:Science
The majority of sessile marine invertebrates reproduce by releasing eggs and sperm (gametes) into the water column where they come into contact and fertilization occurs. This method is called free spawning. Each resulting embryo develops rapidly in the plankton, giving rise to a free-swimming larva. Depending on the species, this larva swims in the plankton for a few minutes up to several months before settling onto a substratum and metamorphosing into the adult form.
Industry:Science
The measurement of the rate of passage of electric charges in a circuit. The unit of measurement, the ampere (A), is one of the base units of the International System of Units (SI). It is defined as that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross section, and placed 1 m apart in vacuum, would produce between these conductors a force equal to 2 × 10<sup>-7</sup> newton per meter of length.
Industry:Science
