- 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.
An African carnivore represented by three species of the family Hyaenidae; this family also includes the aardwolf (<i>Proteles cristatus</i>). Hyena adults are over 4 ft (1.2 m) high and almost 5 ft (1.5 m) in length, and may weigh up to 165 lb (75 kg). While they resemble dogs superficially, they are more closely related to the felids (cats). All three species are adapted for feeding on carrion, having well-developed foreparts, reduced hindquarters, a rounded head, and short strong jaws. The 34 teeth (dental formula I 3/3 C 1/1 Pm 4/3 M 1/1) are extremely strong and together with the powerful jaw muscles can crush bone.
Industry:Science
An aftertreatment device used for pollutant removal from automotive exhaust. Since the 1975 model year, increasingly stringent government regulations for the allowable emission levels of carbon monoxide (CO), hydrocarbons (HC), and oxides of nitrogen (NO<sub><i>x</i></sub>) have resulted in the use of catalytic converters on most passenger vehicles sold in the United States. The task of the catalytic converter is to promote chemical reactions for the conversion of these pollutants to carbon dioxide, water, and nitrogen.
Industry:Science
An aggregation of cells more or less similar morphologically and functionally. The animal body is composed of four primary tissues, namely, epithelium, connective tissue (including bone, cartilage, and blood), muscle, and nervous tissue. The process of differentiation and maturation of tissues is called histogenesis.
Industry:Science
An aggregation of photoreceptor cells together with any associated optical structures. Eyes occur almost universally among animals, and are possessed by some species of virtually every major animal phylum. However, the complexity of eyes varies greatly, and this sense organ undoubtedly evolved independently a number of times within the animal kingdom.
Industry:Science
An agricultural business concerned with breeding goats, primarily for meat, milk, and fiber (called mohair and cashmere). The domesticated goat is closely related and similar in size to sheep, but has many anatomical and physiological differences. Domesticated goats of the major breeds have been developed in, and are mainly derived from, five geographical areas: Swiss mountains (for milk); Indian, Arabian, and northeast African drylands (for meat and milk); west African lowland (for meat and milk); south African prairie (for meat); Turkish highland (for mohair production).
Industry:Science
An agricultural crop grown for its grain and straw in most countries of the temperate zones of the world. In the major oat-growing states of the midwestern United States (Iowa, North Dakota, South Dakota, Minnesota, and Wisconsin) the crop is raised for grain, whereas in the Southern states (Texas, Oklahoma, and Georgia) it is used for pasture or a combination of pasture and grain. About 90% of the annual oat grain production is used for animal feeds, and about 10% is processed into food for humans, for example, oatmeal and other cereal products.
Industry:Science
An air compressor or supercharger on an internal combustion piston engine that is driven by the engine exhaust gas to increase or boost the amount of fuel that can be burned in the cylinder, thereby increasing engine power and performance. On an aircraft piston engine, the turbocharger allows the engine to retain its sea-level power rating at higher altitudes despite a decrease in atmospheric pressure.
Industry:Science
An air pump or blower in the intake system of an internal combustion engine. Its purpose is to increase the air-charge weight and therefore the power output from an engine of a given size. In an aircraft engine, the supercharger counteracts the power loss that results from the decrease of atmospheric pressure with increase of altitude. Various types of pumps and compressors may be used as superchargers, which are either mechanically driven by the engine crankshaft or powered by the engine exhaust gas.
Industry:Science
An aircraft characterized by its large-diameter, powered, rotating blades, attached to a substantially vertical axis. The helicopter can lift itself vertically by the reactive force generated as the rotating blades accelerate air downward. It can both lift and propel itself by accelerating air downward at an angle to the vertical. The helicopter is the most successful vertical takeoff and landing (VTOL) aircraft developed, by virtue of its relatively high efficiency in performing hovering and low-speed flight missions.
Industry:Science
An aircraft instrument that provides a measure of the sideslip or yaw of the aircraft, defined as the angular measure of the relative wind in relation to a vertical plane passing through the longitudinal center of the aircraft. This device is not common to production aircraft, being found in only a few vertical takeoff and landing (VTOL) aircraft which operate in the low-speed regime. The measurement of yaw is accomplished either by a balanced vane which aligns with the wind, or through a set of pressure sensors that determine the difference in static pressure on each side of the vertical plane and hence the sideslip. The device provides equivalent information in the lateral-directional (yaw and roll) axis to the angle of attack in the longitudinal (pitch) axis.
Industry:Science
