An Etymological Dictionary of Astronomy and AstrophysicsEnglish-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 7 Search : half
 full-width at half-maximum (FWHM)   پهنای ِ نیم‌بیشینه   pahnâ-ye nim-bišinéFr.: largeur à mi-hauteur   The full width of a → profile (spectral line or a cross-cut in an image component) at half-maximum intensity.→ full; → width; → half; → maximum.Pahnâ, → width; nim, → half; bišiné, → maximum. half   نیم   nim (#)Fr.: moitié, mi-, demi-   One of two equal or approximately equal parts of a divisible whole.M.E., from O.E. h(e)alf "side, part," from P.Gmc. *khalbas "something divided" (cf. M.Du. half, Ger. halb, Goth. halbs "half").Nim, nimé "half," from Mid.Pers. nêm, nêmag "half;" Av. naēma- "half;" cf. Skt.. néma- "half." half moon   نیمه‌مانگ، نیمه‌ماه   nime mâng, nime mâh (#)Fr.: demi-lune   The moon when, at either quadrature, half its disk is illuminated.→ half; → moon. half-life   نیم‌زیست   nim-zistFr.: demi-vie   The length of time required for half of a given quantity of → radioactive material to → decay.→ half; → life. half-power beamwidth (HPBW)   پهنای ِ تابه در نیم‌توان   pahnâ-ye tâbé dar nim-tavânFr.: largeur à mi-hauteur   The angle between extreme points of the main lobe of an antenna pattern where the sensitivity of the antenna is half the value at the center of the lobe. This is the nominal resolving power of the antenna system.→ half; → power; → beam; → width. half-value layer (HVL)   لایه‌ی ِ نیم-تنکش   lâye-ye nim-tonokešFr.: couche de demi-atténuation   The thickness of material required to reduce the intensity of an → X-ray beam to one half of its initial value. The HVL is an indirect measure of the photon energies of a beam.→ half; → value; → layer; → attenuation. half-wave plate   تیغه‌ی ِ نیم‌موج   tiqe-ye nin-mowj (#)Fr.: lame demi-onde   A plate of optical material whose thickness is such that the phase difference between the extraordinary and ordinary rays after passing through the place is exactly one-half cycle. It can serve to rotate the plane of polarization of a light beam.→ half; → wave; → plate.