An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian
فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک
M. Heydari-Malayeri - Paris Observatory
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work function karyâ-ye kâr Fr.: travail d'extraction The least amount of energy required to remove an electron from the surface of a solid, to a point just outside the solid where the electron has zero kinetic energy. See also → photoelectric effect. |
X-ray diffraction parâš-e partow-e iks Fr.: diffraction de rayons X The diffraction of X-rays by the atoms or ions of a crystal. The wavelength of X-rays are comparable to the size of interatomic spacings in solids. Since the atoms in a crystal are arranged in a set of regular planes, crystals serve as three-dimensional diffraction gratings for X-rays. Planes of repetition within the atomic structure of the mineral diffract the X-rays. The pattern of diffraction thus obtained is therefore used to identify minerals by bombarding them with X-rays. → X-ray; → diffraction. |
X-ray Dissociation Region (XDR) nâhiye-ye vâhazeš-e partowhâ-ye X Fr.: région de dissociation par rayons X A region of → molecular clouds whose chemistry is affected by → X-rays from neighboring sources. → X-ray; → dissociation; → region. |
zero suppression nehâveš-e sefr Fr.: suppression de zéro The removal of non-significant zeroes from a number. For example, replacing 531.2300 by 531.23. → zero; → suppression. |
Zeta Orionis zetâ-Šekârgar, zetâ-Orion Fr.: Zeta (ζ) Orionis Same as → Alnitak. Zeta (ζ), Gk. letter in the → Bayer designation scheme. |
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