| slovo | definícia |
nuclear cross section
(gcide) | cross section \cross section\ n.
1. a flat plane cutting through a three-dimensional object,
usually at right angles to the longest axis of the object.
[PJC]
2. any visual representation of a cross section[1], showing
the internal structure of the object in the plane of the
cross section; as, the technician prepared a series of MRI
cross sections of the skull.
Note: Different cross sections created by different
techniques may show different aspects of internal
structure. Thus computerized axial tomography using
X-rays shows different structures than are visualized
by MRI.
[PJC]
3. a thin slice of an object made by cutting it transversely;
as, to view a cross section of a bacterium with an
electron microscope after staining the DNA; cross sections
were prepared with a microtome.
[PJC]
4. a representative sample of a complex group; as, the town
contained a cross section of the American population.
[PJC]
5. (Physics) a measure of the probability that a nucleus will
interact in a specified way with a bombarding particle,
expressed as the effective area that the nucleus presents
to the particle; -- called also nuclear cross section.
[PJC] |
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