# 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

## 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.

## 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.
References in periodicals archive ?
It should be emphasized that the cross-sectional area of the bearing components of single-lane suspension structures is selected according to the condition for the appropriateness of the limit state.
It promotes both the inflammatory response and progression of AS.20 In this study, the cross-sectional ApoAI, ApoB, ApoE and Lpa levels were similar in the two groups.
Understanding ageing: Further commentary on the limitations of cross-sectional designs for ageing research.
where A is the cross-sectional area, MajorAxis is the length of the major axis of the ellipse used to approximate the cross-sectional fiber shape, and [d.sub.equiv] is the equivalent diameter of a circular fiber with the same cross-sectional area.
If a BTB graft has the thickness of 3 mm, the width of 10 mm and the cross-sectional area (CSA) of 30 [mm.sup.2], it is still significantly smaller than a cross-sectional area of the native ACL and/or 8 mm diameter hamstring tendon graft (with 50 [mm.sup.2] of cross-sectional area) .
The via cross-sectional conducting area was the same as that of the trace.
Note that the continuity law described the same relationship between the velocity of the flow and the cross-sectional area.
First, the 5 cm-wide linear-array transducer could satisfactorily image in its entirety only the cross-sectional image of the distal portion of the quadriceps (see previous section on experiments in nondisabled subjects); therefore, in the subjects with COPD, the two operators used only the 6 cm-wide curved-array transducer (5 MHz, C60x, SonoSite).
The Cross-Sectional Dependence (hereafter CD) test of Pesaran (2004) is based on the average of pair-wise correlation coefficients [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] of the OLS residuals obtained from the individual ADF regressions and is calculated as:
(ii) the cross-sectional girder elements are considered as elastically restrained plates;
Trends in HCV prevalence, risk factors and distribution of viral genotypes in injecting drug users: findings from two cross-sectional studies.
However, the same was not true of boys, and a cross-sectional analysis of both sexes at age 9 showed a positive association between current BPA urinary concentrations and obesity.

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