| 释义 |
cross section
cross section also cross-sec·tion (krôs′sĕk′shən, krŏs′-)n.1. a. A section formed by a plane cutting through an object, usually at right angles to an axis.b. A piece so cut or a graphic representation of such a piece.2. Physics A quantity, measured in units of barns, used to express the probability of an encounter between particles over a given area in a collision. Also called collision cross section.3. Statistics A sample meant to be representative of a whole population.4. Informal A variety; a diversity.
cross′-sec′tion·al adj.cross section n 1. (Mathematics) maths a plane surface formed by cutting across a solid, esp perpendicular to its longest axis 2. (Mathematics) a section cut off in this way 3. the act of cutting anything in this way 4. a random selection or sample, esp one regarded as representative: a cross section of the public. 5. (Surveying) surveying a vertical section of a line of ground at right angles to a survey line 6. (General Physics) 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 ˌcross-ˈsectional adjcross′ sec`tion
n. 1. a section made by a plane cutting something transversely, esp. at right angles to the longest axis. 2. a representative sample showing all characteristic parts, relationships, etc., of the whole. 3. a vertical section of the ground surface taken at right angles to a survey line. 4. Physics. a measure of the probability, expressed as the effective area of a given particle, that one particle will interact with another. cross′-sec′tion, v.t. cross′-sec′tional, adj. Thesaurus| Noun | 1. | cross section - a section created by a plane cutting a solid perpendicular to its longest axisprofile - a vertical section of the Earth's crust showing the different horizons or layersplane section, section - (geometry) the area created by a plane cutting through a solid | | 2. | cross section - a sample meant to be representative of a whole populationsample - a small part of something intended as representative of the wholestatistics - a branch of applied mathematics concerned with the collection and interpretation of quantitative data and the use of probability theory to estimate population parameters | | 3. | cross section - (physics) the probability that a particular interaction (as capture or ionization) will take place between particles; measured in barnsprobability, chance - a measure of how likely it is that some event will occur; a number expressing the ratio of favorable cases to the whole number of cases possible; "the probability that an unbiased coin will fall with the head up is 0.5"atomic physics, nuclear physics, nucleonics - the branch of physics that studies the internal structure of atomic nuclei |
Translationscross section
cross section1. 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 sectionA 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.cross section
cross sec·tion1. a planar or two-dimensional view, diagram, or image of the internal structure of the body, part of the body, or any anatomic structure afforded by slicing, actually or through imaging (for example, radiographic, magnetic resonance, or microscopic) techniques, the body or structure along a particular plane. Traditionally, "cross section" referred to views resulting from slicing at right angles to the longitudinal axis of the structure (axial or transaxial), but in contemporary use, the term is applied when the structure is sliced in any given plane; 2. the slice or section of a given thickness created by actual serial parallel cuts through a structure or by the application of imaging technique. cross sectionA section perpendicular to the long axis of an organ.See also: sectionLegalSeeSectionFinancialSeesectionAcronymsSeeexcesscross section
Related to cross section: Scattering cross sectionWords related to cross sectionnoun a section created by a plane cutting a solid perpendicular to its longest axisRelated Words- profile
- plane section
- section
noun a sample meant to be representative of a whole populationRelated Wordsnoun (physics) the probability that a particular interaction (as capture or ionization) will take place between particlesRelated Words- probability
- chance
- atomic physics
- nuclear physics
- nucleonics
|