# 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 It might be outdated or ideologically biased.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.

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 ?
It can be clearly seen that the EPDM flow results reveal that all three runner cross-sections have similar flow results to each other.
In addition, contaminated fibers would result in an obscured cross-section image thus introducing error on the determination of cross-section area, and they should be removed too.
Percent CVs were 11.33, 16.31, and 8.11 for surface ages and 19.68, 9.64, and 9.96 for cross-section ages from trials 1, 2, and 3, respectively (Table 1).
Note that the cross-section of arbitrary complexity could be approximated by conical sections with eigensolutions (2.7) and hence, the methods developed in present report are applicable for approximate analysis of steeped bars with arbitrary cross-sections.
Let us consider a doubly reinforced, uncracked and statically determinate element of arbitrary cross-section with a vertical axis of symmetry.
To evaluate these isolation uncertainties (i.e., to determine both the central value and deviations), we use MATRIX to calculate the NLO integrated cross-sections by varying the parameters n = 0.1,0.5,1,2,4,10 and [E.sup.max.sub.T] = 2,3,4,5, 8, 11 GeV; then the results are compared to the NLO cross-sections obtained by running the DIPHOX code using the standard isolation prescription with the same [E.sup.max.sub.T] and R parameters.
Meanwhile, in the cross-section SEM image in Figure 1b, even if optical inspection had been possible, the crack is hidden by the solder mask.
In order to determine the moment curvature diagrams of composite steel concrete cross-sections subjected to axial force and given bending moment ratio (tan([alpha]) = [M.sub.y]/[M.sub.z]) a new incremental-iterative procedure is proposed.
(2) pedestrians begin to go across crosswalk boundary at middle-side cross-section, and, then, they keep on walking outside the crosswalk until finishing crossing at far-side cross-section; it is clear that pedestrian crossing positions at three cross-sections are concentrated in a range; if we want to confine pedestrians to walking on the crosswalk, countermeasure such as pedestrian guard rail set in a certain range at far-side cross-section can achieve the goal; so, a model describing the law of overflow violation pedestrian trajectories variation is quite necessary.
Several unconfined aquifers have been identified in all the cross-sections with average thickness of 15m to 25m through which water can be extracted economically for a long period of time.
Cross-sections of 14 MeV neutron induced reactions on some isotopes of chromium, zirconium and tin.

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