- 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.
A morphologically complex cellular organelle at the focus of centrosomes in animal cells and some lower plant cells. Prokaryotes, some lower animal cells, higher plant cells, and a few exceptional higher animal cells do not have centrioles in their centrosomes. Centrioles typically are not found singly; the centrosome of higher animal cells contains a pair of centrioles (together called the diplosome), arranged at right angles to each other and separated by a distance ranging from 250 nanometers to several micro-meters.
Industry:Science
A morphologically distinct type of trace fossil left by boring organisms in hard biogenic substrates. <i>Oichnus</i> Bromley 1981 is a formal taxonomic name with the rank of ichnogenus (a trace fossil genus). <i>Oichnus</i> is a Latin-derived term that literally means a trace (ichnus) shaped like the letter “O”; it denotes the small circular to subcircular holes (borings) found primarily in fossilized skeletal remains of invertebrate animals, such as mollusk shells, ostracode valves, or echinoid tests.
Industry:Science
A motor and one or more generators, with their shafts mechanically coupled, used to convert the voltage or frequency of an available power source to another desired frequency or voltage. The motor of the set is selected so that it operates from the available power supply; the generators are designed to provide the desired output voltage or frequency. Motor-generator sets are also employed to provide special control features for the output voltage.
Industry:Science
A motor vehicle (“lorry” in British English) carrying its load on its own wheels and primarily designed for the transportation of goods or cargo.
Industry:Science
A motor vehicle for mass transit, built in various capacities and sizes, designed for carrying from 10 to 90 passengers or more on school, local, intercity, or interstate routes. In general, a bus has a long body with passengers sitting on benches or seats, while in local transit service additional passengers may be standing in the aisle. A school bus is used primarily to transport secondary school or younger students from home to school and back. Also called a coach or motor coach, the commercial bus for local transit and longer travel usually operates on a regular schedule and travels a fixed route, and each passenger pays a fare.
Industry:Science
A motor-generator consists of a component that spins, called the rotor, and a stationary component, called the stator. The rotor is usually suspended from the stator by a mechanical bearing, such as a ball bearing, roller bearing, or journal bearing. This method of suspension makes sense for most applications, as it is very economical. However, certain high-performance applications either require or can be greatly enhanced by a noncontacting suspension system. In applications where the rotor moves at an extremely high speed (and the friction losses of a mechanical system would be prohibitively large), where access for bearing maintenance (for example, lubrication) is limited, or where long life is required (mechanical bearings are a wear item, and have a limited lifetime), a noncontacting suspension might be preferred. This article describes a noncontacting system in which the rotor is suspended on a magnetic field, allowing five-axis levitation with a new type of bearingless motor-generator.
Industry:Science
A mountain belt or chain which is an assemblage of individual mountain ranges and associated plateaus and intermontane lowlands. A cordillera is usually of continental extent and linear trend; component elements may trend at angles to its length or be nonlinear.
Industry:Science
A mountain or hill, generally steep-sided, formed by accumulation of magma (molten rock with associated gas and crystals) erupted through openings or volcanic vents in the Earth's crust; the term volcano also refers to the vent itself. During the evolution of a long-lived volcano, a permanent shift in the locus of principal vent activity can produce a satellitic volcanic accumulation as large as or larger than the parent volcano, in effect forming a new volcano on the flanks of the old.
Industry:Science
A multilayered, multidimensional means to safeguard passengers, crew, ground personnel, and the general public against acts of unlawful interference perpetrated in flight or within the confines of the airport. It specifically refers to the techniques and methods used in protecting aviation from crime or terrorism.
Industry:Science
A multisystem illness caused by the tick-borne spirochete <i>Borrelia burgdorferi</i>. The disease, also known as Lyme borreliosis, generally begins with a unique expanding skin lesion, erythema migrans, which is often accompanied by symptoms resembling those of influenza or meningitis. During the weeks or months following the tick bite, some individuals may develop cardiac and neurological abnormalities, particularly meningitis or inflammation of the cranial or peripheral nerves. If the disease is untreated, intermittent or chronic arthritis and progressive encephalomyelitis may develop months or years after primary infection.
Industry:Science
