cross section

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Related to cross section: Scattering cross section

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 is more convenient to express of the differential cross section in terms of a quantity known as the Generalized Oscillator Strength, F (q, [epsilon]) defined by
The parameters were adjusted from their original values as shows in table 3 (Hint: We select the energy at maximum cross section for different reactions for selected isotopes).
student Alice DeSimone, indicates the cross sections increase even more with decreasing water coverage.
Next, the side-edge flow was found to generate in the same way at the circular cross section of [phi]5 and semicircular cross section of R2.
As regards as all above commented, feed provokes a cross section increasing, as it can be expected from single models such those which consider the initial section as the product of depth by feed.
If a cross-section is constructed perpendicular to the strike of bedding, the dip of beds in the cross section will be the same as the dip measured in 3-D.
These results indicate that the compression processing has a marked influence on the elastic properties about the cross section of wood, and that the change in these properties should be taken into account when fabricating compressed wood.
The error on the total atomic photo effect cross section is of the order of 2%.
An elliptical cross section with a north-south orientation would have reduced heat buildup within the nest.
Aquino added, "Neighboring retailers are GNC, CVS Pharmacy, Gourmet Garage, Jekyll & Hyde, Citibank, Duplex Cabaret, Federal Express, and New York Sports Club, a cross section of major retailers on this major cross section in Greenwich Village.
A portion of the trailing end is held within the charger and the inserter is a hollow cone with a tapering inner cross section, the first section is made of the base of the cone.
WRIGHT-PATERSON AIR FORCE BASE, Ohio (AFPN) -- Air Force officials announced the completion of the final two requirements -- first flight of Raptor 4006 and initiating radar cross section testing -- which clear the way for an F-22 production decision.

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