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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 It might be outdated or ideologically biased.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.

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

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 ?
(iii) Considering the interval 0.5 < n < 2, at fixed [E.sup.max.sub.T] = 4 GeV, the total NNLO cross-section with n = 1 increases by about 4% with n = 0.5 and decreases by about 5% with n = 2; the corresponding scale uncertainty is less than [+ or -] 8.7%.
where: [mathematical expression not reproducible] and [mathematical expression not reproducible] are the stresses and strains in the top and bottom fibres of the cross-section at time t, [t.sub.0] is the age of loading, i.e., time of initiation of autogenous shrinkage strain, h is the height of the cross-section.
Evaluation of internal resultant efforts and cross-section tangent stiffness matrix coefficients
Figure 2 shows the influence of the variation degree of variable cross-section segment at pile head on the vertical dynamic response of pile head.
Unlike the rectangular cross-section elements, whose longitudinal reinforcing bars are located as close as possible to the most highly stressed layers of the compression and tension zones, the longitudinal reinforcing bars of the circular cross-section elements are usually uniformly distributed along the circular cross-section perimeter.
To calculate a factor, the analysed cross-section has been divided into sections subjected to various limitations (Fig.
Using all imported data (from DXF file) for sweeping cross-section from figure 3, we obtain one layer from FDM prototype as a part from ProE Wildfire 3.0.
Similarly, the cross sections were aged independently and then assigned a definitive cross-section age by mutual agreement.
PDE with discontinuous coefficients, numerical approximation of eigenvalues, stepped structure, transducers, waveguide, variable cross-section, non-classical boundary conditions, Green function, resonance