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.

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.

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.

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)

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).
References in periodicals archive ?
This has never been possible with any other analytical platform before," explained Professor Spencer, who also serves as Director of Biochemical Screening of the Fetal Medicine Foundation (FMF).
AstraZeneca implemented Thermo Scientific Nautilus Laboratory Information Management Systems (LIMS) to centralize biochemical screenings, map laboratory workflows and dramatically drive efficiency through superior data management.
Examples of application domains include the quality management of biotechnology processes, medical diagnostics, quality management in the food industry, environmental monitoring, epidemiology, forensic medicine, and high-throughput biochemical screening.
Microcide's unique approach to development of target-based screens is more effective than traditional biochemical screening methods, requiring less time and resource expenditure.
Aventis and its worldwide affiliates will have the ability over a three year period to order research services that draw on Argenta's entire complement of chemical and biological research capabilities, spanning the drug discovery process from target to candidate, including: compound and library synthesis, medicinal chemistry, computer-aided drug design (CADD), biochemical screening, assay development, cellular screening and in vitro pharmacokinetics.
The site also highlights the industry experience of the Company's management and research staff, and presents Argenta's Quicksilver Discovery Programme(TM), a unique approach to rapid hit-to-lead and lead optimisation services that integrates chemistry, biochemical screening and computer-aided drug design.
to provide biochemical screening to support Millennium's drug discovery programmes.
MGI's technology provides a 10,000 to 100,000 fold increase in the discovery rate over conservative biochemical screening approaches.
John Greaves, Kemin's Vice President for Research and Development, the alliance will significantly strengthen Kemin's microbial genetic engineering and biochemical screening capabilities and provide a unique platform of genetic diversity from which to source new genes.