screening

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screening

[′skrēn·iŋ]
(atomic physics)
The reduction of the electric field about a nucleus by the space charge of the surrounding electrons.
(electromagnetism)
(engineering)
The separation of a mixture of grains of various sizes into two or more size-range portions by means of a porous or woven-mesh screening media.
The removal of solid particles from a liquid-solid mixture by means of a screen.
The material that has passed through a screen.
(industrial engineering)
The elimination of defective pieces from a lot by inspection for specified defects. Also known as detailing.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

screening

the use of academic qualifications as a means of selecting among candidates for employment, where it is the general level of academic qualification which is decisive rather than the particular content of the education. In this process, an employer may use educational qualifications, or sometimes also the type of institution attended, as a proxy for ‘general intelligence’, ‘perseverance and motivation’, or other 'social background’, instead of being interested in the specific content of the education received. see also CULTURAL CAPITAL.

According to the screening hypothesis, it is the screening process rather than any direct economic return on education which explains part of the correlation between level of education and level of income. This hypothesis provides an account of the effects of education which is at odds with other hypotheses (compare HUMAN CAPITAL). See also CREDENTIALISM, CULTURAL CAPITAL.

Collins Dictionary of Sociology, 3rd ed. © HarperCollins Publishers 2000
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Screening

 

the sorting on screens of bulk materials according to particle size. Screening is used to separate coal, ore. building materials, and other bulk materials into fractions or to sort out particles of a given size. For example, in the production of crushed gravel (about 200 million cu m in the USSR in 1970). a mass of raw sand and gravel is sorted out into five fractions (70–40 mm. 40–20 mm, 20–10 mm, 10–5 mm, and less than 5 mm). During screening, the material is separated into layers as it moves along the sieve of the screen: the larger the particles, the higher the layer along which they move. Particles that are smaller than the screen openings (so-called lower grade) fall through the openings upon reaching the screen’s surface (screen underflow); larger particles (so-called upper grade) slide along the sieve and form the screen overflow. Because of limitations on the length of the screen, not all particles that are smaller than the sieve openings fall through; some remain in the screen overflow, contaminating it and reducing the quantity of the underflow.

The efficiency of screening depends on many factors: the size and shape of the particles in the initial material and the load it exerts on the screen, the type of screen, and the size and shape of the openings in the sieve, its length, and its angle of inclination. The maximum efficiency of trommels is 60–70 percent: of shaking screens. 70–80 percent; and of vibrating screens, 90–98 percent. Screening on sieves with openings of 3 mm and more is widespread in industry; openings of 1 mm are rarely encountered. Hydraulic classification or air separation is usually used to sort materials containing particles smaller than 1–3 mm. Since screening ensures high-quality sorting, its use is spreading, particularly the use of sieves with small openings.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

Screening

A mechanical method of separating a mixture of solid particles into fractions by size. The mixture to be separated, called the feed, is passed over a screen surface containing openings of definite size. Particles smaller than the openings fall through the screen and are collected as undersize. Particles larger than the openings slide off the screen and are caught as oversize. A single screen separates the feed into only two fractions. Two or more screens may be operated in series to give additional fractions. Screening occasionally is done wet, but most commonly it is done dry.

Industrial screens may be constructed of metal bars, perforated or slotted metal plates, woven wire cloth, or bolting cloth. The openings are usually square but may be circular or rectangular. See Mechanical classification, Mechanical separation techniques, Sedimentation (industry)

McGraw-Hill Concise Encyclopedia of Engineering. © 2002 by The McGraw-Hill Companies, Inc.

screening

The application of technical or other means which are intended to detect weapons, explosives or other dangerous devices that may be used to commit an act of unlawful inference (ICAO).
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
However, the gel method is preferred for antibody screening. Laboratories are currently about evenly split between gel and tube methods when performing crossmatching.
This study showed that with pipetting Technique #2 (with no air gap), 24.7% of clinically significant antibodies failed to be detected in manual gel antibody screening tests and 11.3% of reactions were weaker than their Technique #1 counterparts (p<0.001).
The company has successfully developed several proprietary technology platforms such as MBAS (Molecule Based Antibody Screening) and CBAS (Cell Based Antibody Selection) that not only fuel the in-house drug discovery engine, but also provide additional opportunities to support the company's business goals through value generating discovery and licensing deals.
Panel-reactive antibody screening practices prior to heart transplantation.
Patients were required to have normal lactose and lactulose breath tests and negative antibody screening for celiac disease for inclusion.
Wainberg recommended the creation of affordable tests such as polymerase chain reaction assays to directly monitor the presence of HIV instead of relying on the current method of antibody screening.
The APTIVA assay could be used as a "potential alternative" to the traditional Western blot test that is currently used to confirm HIV-1 infection in a patient with positive HIV-1 antibody screening tests, according to the FDA statement.
bat species (n=54), and 98 nonhuman terrestrial mammals (24 cats, 3 dogs, 5 cattle, 9 horses, 1 sheep, 1 llama, 42 foxes [grey, red, and kit], 1 raccoon, 1 ringtail cat, and 11 striped skunks), determined to have been infected by a bat rabies virus by using monoclonal antibody screening. Reservoir species from the eight U.S.
These are women not known to be at risk because we don't do routine antiplatelet antibody screening or antigen testing," he said.
The prevalence of coeliac disease (identified by antibody screening) in patients with insulin-dependent diabetes mellitus is 1-7.8% [9].
Adding the HIV antibody screening seems like a no-brainer.