# cross section

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## cross section

1. Maths a plane surface formed by cutting across a solid, esp perpendicular to its longest axis
2. a section cut off in this way
3. Physics a measure of the probability that a collision process will result in a particular reaction. It is expressed by the effective area that one participant presents as a target for the other
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

## Cross Section

in hydraulics, the cross section of a liquid stream (in a pipeline, channel, or river) perpendicular to the direction of the flow velocity. If the liquid motion is continuously changing, the cross section is taken as flat and equal to the cross section area of the flow.

## cross section

[′krȯs ‚sek·shən]
(geology)
A diagram or drawing that shows the downward projection of surficial geology along a vertical plane, for example, a portion of a stream bed drawn at right angles to the mean direction of the flow of the stream.
An actual exposure or cut which reveals geological features.
(graphic arts)
A diagram or drawing representing a cut at right angles to an axis.
(mapping)
A horizontal grid system that is laid out on the ground for determining contours, quantities of earthwork, and so on, by means of elevations of the grid points.
(mathematics)
The intersection of an n-dimensional geometric figure in some euclidean space with a lower dimensional hyperplane.
A right inverse for the projection of a fiber bundle.
(physics)
An area characteristic of a collision reaction between atomic or nuclear particles or systems, such that the number of reactions which occur equals the product of the number of target particles or systems and the number of incident particles or systems which would pass through this area if their velocities were perpendicular to it. Also known as collision cross section.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

## cross section

A representation of a building, or portion thereof, drawn as if it were cut vertically to show its interior; often taken at right angles to the longitudinal axis of the building.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
Within the framework of the proposed approach to the selection of the allowable cross sections [S.sub.il] of wires (cables) in the power circuits of electrical installations for general industrial purposes, the calculation estimation of their thermal stability can be demonstratively carried out.
In Section 3, we will show that, by symbolic computation of the four edges in the Magnel quadrilateral, we can seek inside the region to find an appropriate design point for each cross section. First, parabolic and linear tendon profiles will be derived by using three cross sections.
Figure 6 gives the scattering and absorbing cross sections of red clay particles.
Abdesselam et al., "Ratio of Isolated Photon Cross Sections in p[bar.p] Collisions at [square root of (s)] = 360 and 1800 GeV," Physical Review Letters, vol.
Correspondence Definition between 3D Blood Vessel Models and Extraction of Cross Sections. To register two blood vessel models in different states, correspondence between the two models should be defined first.
The (RIPL) contains input parameters for theoretical calculations of nuclear reaction cross sections. The library is targeted at users of nuclear reaction interested in nuclear applications.
Georgia Tech's cross section values can now be used by scientists attempting to find water throughout the solar system and beyond.
Thus, it has been possible in the present work to measure the angle integrated total (coherent + incoherent) scattering cross sections at very low angles by using a NaI(Tl) detector by a simple method.
The total extinction coefficient, a=[sigma]N, was expressed as a product of the total extinction cross section, [sigma], in units of [cm.sup.2] and the concentration of microspheres, N, in units of [cm.sup.-3].
In response to market demands, Wieland has engineered the new 8513 Headers & plugs to allow users to connect wires with cross sections of up to 1.5[mm.sup.2].

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