# cross section

Also found in: Dictionary, Thesaurus, Medical, Legal, Financial, Acronyms, Wikipedia.
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
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 It might be outdated or ideologically biased.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.

## 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 ?
Results of the refined calculation selection of the permissible cross sections [S.sub.il] and current densities [[delta].sub.il] in wires and cables of circuits of electrical installations for general industrial purposes.
This enabled (26)-(28) to be used, and in each cross section, [([e.sub.i]).sub.D] could be computed.
Figure 6 gives the scattering and absorbing cross sections of red clay particles.
There are some computer codes that can be used to calculate the prompt photon production cross section at NLO such as JETPHOX [30, 32, 98] and PeTeR .
Accordingly, in this study, we propose a method of determining the corresponding relation between the two 3D blood vessel models to extract the cross sections at the corresponding positions and matching them.
[sigma]: is the activation cross section (1barns=[10.sup.-24][cm.sup.2]) refers to the production of the particular radioactive
"The cross section is an important number planetary scientists, astrochemists and the astrophysics community need for models regarding the fate of water on comets, moons, asteroids, other airless bodies and interstellar grains," said Thomas Orlando, the Georgia Tech professor who led the study.
In the present work, such a method , for measuring the scattering cross sections of gamma rays at small angles, which uses a simple geometrical setup similar to that of the experimental setup employed for the measurement of total attenuation cross sections was described earlier  by one of the authors.
In order to compare the calculated cross section with the data, the values of the cross sections were multiplied by a concentration, a unit conversion factor 0.01, and 1/2.303 to obtain the expected absorbance.
Many scholars have carried out the researches on the wall thickness change and cross section deformation of tubes during bending process using theoretical analysis, experimental research, and the finite element method (FEM) simulation.
This method is capable of not only dynamic visualization of resins but also static visualization by observation of the sample cross section in which colored resins switched at multilayers at the gate spread into different layers inside the sample and freeze.
In this paper, a first approach to the combined study of the chip morphology, the cross section and cutting parameters has been developed.

Site: Follow: Share:
Open / Close