# 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 ?
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.
If flow cross-section of river and stream is insufficient, cross-section will not carrn of dam discharges.
The number of fibres cutting-through the given cross-section surface of composite space in the so-called geometric model has been defined applying the fibre orientation factor (a) (Dupont, Vandewalle 2005) defining the average proportion of fibre length projection (onto the horizontal axis) to their length.
The authors established a protocol for testing a particular flow characteristic of the rubber compounds in various runner cross-sections and then observed a relationship between the cross-sectional areas of each respective runner cross-section to the perimeters of each respective runner cross-section.
These modifications focus on (1) the selection of fibers for testing and (2) the accuracy of cross-section area determination of natural fibers.
Cross-sections often accompany geological, geo-morphological, engineering, tectonic, and other maps in scientific and technical bulletins, open file reports, and professional and industrial organizational proceedings.
Von Bertalanffy growth parameters were estimated from surface and cross-section ages combined from trials 2 and 3.
Design of the insert as a separate cooling zone, in unison with trapezoidal machining of the insert's cross-section, reduced the cooling time by 4 sec, so that cycle time was reduced from 13 to 9 sec, or 31%.
Cryptic inscriptions run all over the Uruguayan artist's metal rulers, rectangles of Plexiglas, sheets of aluminum foil, and real McIntosh apples; conjoined cells of various shapes are filled in with straight lines, dashes, and curlicues; scattered shapes are reminiscent of everything from sails and tents to sword handles and dense enclaves of buildings (in cross-section and bird's-eye views).
For small cross-sections and high flow rates, segregated bands still may form, although they are expected to be less apparent, being a simple result of a velocity boundary layer around the maximum packing solid fraction where material against the die wall is essentially immobile.

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