Component

In telecommunication and computing, the term component has the following meanings:

1. An assembly, or part thereof, that is essential to the operation of some larger assembly and is an immediate subdivision of the assembly to which it belongs.

Note: For example, a radio receiver may be a component of a complete radio set consisting of a combined transmitter-receiver, i.e., a transceiver. The same radio receiver could also be a subsystem of the combined transmitter-receiver, in which case the IF amplifier section would be a component of the receiver but not of the radio set. Similarly, within the IF amplifier section, items, such as resistors, capacitors, vacuum tubes, and transistors, are components of that section.

2. In logistics, a part, or combination of parts having a specified function, that can only be installed or replaced as an entity. .

3. In material, an assembly or any combination of parts, subassemblies, and assemblies mounted together in manufacture, assembly, maintenance, or rebuild.

Source of 1-3: from Federal Standard 1037C and from MIL-STD-188 and from a 1994 draft revision of the Department of Defense Dictionary of Military and Associated Terms and from the Department of Defense Dictionary of Military and Associated Terms

4. In software, the word has an emerging meaning generalizing the idea of a software pattern, software object, software framework and software architecture. A software component can be any of these.

See also: component software theory, software component.

5. In thermodynamics, a component is a chemically distinct constituent of a phase of a system.



In the News

Rave Reviews: Bestselling Fiction in America
Companion to an exhibition that provides "an index of American interests and reading tastes over the last two and a half centuries"and considers the impact of popular fiction on American society. Features illustrated discussions of bestsellers and movies, and types of bestsellers (such as regional, genre, and war fiction, social criticism, and scandalous books), and a link to bestseller lists (1900-1999). From the Albert H. and Shirley Small Special Collections Library, University of Virginia.

Jupiter's Massive Winds Likely Generated From Deep Inside Its Interior
A new computer model indicates Jupiter's massive winds are generated from deep within the giant planet's interior, a UCLA scientist and international colleagues report. Massive east-west winds in Jupiter's equatorial region reach approximately 340 miles per hour -- twice as rapid as winds generated by strong hurricanes on Earth. At higher latitudes, the wind pattern switches to alternating jets that race around the planet.

Moving Closer To The Grand Spiral
An international team of astronomers from Chile, Europe and North America is announcing the most accurate distance yet measured to a galaxy beyond our Milky Way's close neighbours. The team used the ISAAC instrument on ESO's 8.2-m VLT Antu telescope to obtain deep images in the near-infrared of three fields in NGC 300 and determine the distance to this spiral galaxy with an unprecedented uncertainty of only three percent.

The Smell Of Money: Absence Of Metallic Chemicals In Odors From People
It's not hard to recall the pungent scent of a handful of pocket change. Similar smells emanate from a sweat-covered dumbbell or the water emerging from an old metal pipe. Yet no one has been able to identify the exact chemical cause of these familiar odors.

Playstation as High-End CD Player
MSNBC's Gary Krakow claims the PS1 is high-end audio, so long as you "break it in" for 3 days. A sonic symphony or pseudoscience? In Gear Factor.

Progesterone Injections Do Not Prevent Preterm Birth In Twin Pregnanci
Weekly progesterone injections do not prevent premature births in women pregnant with twins, a new study has found. The result came as a surprise to the researchers, who previously discovered that weekly injections of the naturally occurring hormone, 17-OHPC, reduced additional preterm births by one-third in women whose previous babies were born prematurely.

United States Senate Office of Public Records [Lobby Filing Disclosure
"In accordance with the Lobbying Disclosure Act of 1995 the Secretary of the Senate has initiated this program to allow the public to view filings received by the Office of Public Records."View digitized images of lobby reports by name (registrant, client, lobbyist), client country or state, filing year (1998-present), and other criteria. Includes instructions for using the program. From the U.S. Senate.

Deep Brain Stimulation In Parkinson Disease Reduces Uncontrolled Movem
Deep brain stimulation of two different areas of the brain appears to improve problems with uncontrolled movements (dyskinesia) in patients with Parkinson disease (PD), according to an article in the April issue of Archives of Neurology, one of the JAMA/Archives journals.

Magnetic Insoles Do Not Provide Pain Relief, Mayo Clinic Study Reports
Magnetic shoe insoles did not effectively relieve foot pain among patients in a study, researchers report in the current issue of Mayo Clinic Proceedings. And the results indicate that patients who strongly believed in magnets had pain relief even if they were given false magnets to wear.

Protein That Helps Skin Cancer Spread Identified By Stanford Researche
A protein that normally helps hold the skin intact is also needed by skin cancer cells as they spread to other regions of the body, researchers at the Stanford University School of Medicine have discovered. Identifying this protein's role opens the door for stopping the spread of this deadly cancer-the second most common cancer type in the United States.


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