An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 13048 Search : far
nucleonics
  هستونیک   
hastonik

Fr.: nucléonique   

The practical applications of nuclear physics, and the techniques associated with those applications.

From → nucleon + → -ics.

nucleosynthesis
  هسته‌هندایش   
haste-handâyeš

Fr.: nucléosynthèse   

The process by which → nuclear reactions at very high temperatures and pressures produce the various → chemical elements of the → periodic table, either in the → Big Bang or in stellar interiors. See also → primordial nucleosynthesis, → stellar nucleosynthesis, → explosive nucleosynthesis.

From nucleo-, combining form of → nucleus + → synthesis.

Haste-handâyeš, from hasténucleus + handâyešsynthesis.

nucleosynthesize
  هسته-هنداییدن   
haste-handâyidan

Fr.: nucléosynthétiser   

Produce through → nucleosynthesis.

nucleosynthesis; → -ize.

nucleosynthetic
  هسته‌هندایشی   
haste-handâyeši

Fr.: nucléosynthétique   

Of, pertaining to, proceeding by, or involving → nucleosynthesis.

Adj. of → nucleosynthesis.

nucleosynthetic era
  دوران ِ هسته‌هندایش   
dowrân-e haste-handâyi

Fr.: ère nucléosynthétique   

The era following the leptonic era, between 1 second and 1000 seconds after the Big Bang, when neutrons were abundant and helium and deuterium were synthesized.

nucleosynthetic; → era.

nucleosynthetic process
  فراروند ِ هسته‌هندایشی   
farâravand-e haste-handâyeši

Fr.: processus nucléosynthétique   

A process involving → nucleosynthesis, such as → r-process and → r-process.

nucleosynthetic; → process.

nucleus
  هسته   
hasté (#)

Fr.: noyau   

1) Core of an atom, where most mass and all positive charge is concentrated. It consists of protons and neutrons.
2) Of a comet, the stellar-appearing frozen core, containing most of the cometary mass, in the head of a comet.

From L. nucleus "kernel," from nucula "little nut," diminutive of nux "nut," from PIE *knu(k) "lump" (cf. M.Ir. cnu, Welsh cneuen, M.Bret. knoen "nut," O.N. hnot, O.E. hnutu "nut").

Hasté, variants asté "kernel, fruit stone," ostoxân "bone," from Mid.Pers. astak "fruit stone, bone," ast "bone;" Av. ast- "bone;" cf. Skt. asthi- "bone;" Gk. osteon; L. os; Hittite hashtai-; PIE base *os-.

nuclide
  هسته‌وار   
hastevâr

Fr.: nucléide   

A species of atom characterized by the constitution of its nucleus, i.e. by the numbers of protons and neutrons it contains.

From nucl(eo), → nucleus, + -ide, from Gk. eidos "shape."

Hastevâr, from hasté, → nucleus, + -vâr a suffix meaning "resembling, like," from Mid.Pers. -wâr, Av. -vara, -var, cf. Skt. -vara.

null
  ۱) نول؛ ۲) نولیدن   
1) nul; 2) nulidan

Fr.: 1) nul; 2) rendre nul   

1a) General: Being or amounting to nothing; nil; nonexistent; without value, effect, or significance.
1b) Math.: Of a set, empty. Of measure zero.
1c) Electronics: A point of minimum signal reception, as on a radio direction finder or other electronic meter.
2) To make null; cancel.

From M.Fr. nul, from L. nullus "not any, none," from ne- "not, no" → non- + illus "any," dimunitive of unus "one."

Nul, from na-, → non-, + -ul a variant of the Pers. suffix → -al. Nulidan, infinitive from nul.

null geodesic
  کهین‌ره ِ نول   
kehinrah-e nul

Fr.: géodésique nulle   

1) The path taken by a light ray in a curved → space-time just as a → timelike geodesic describes the path of a material particle.
2) A → geodesic of length zero.

null; → geodesic.

null hypothesis
  انگاره‌ی ِ نول   
engâre-ye nul

Fr.: hypothèse nulle   

Statistics: The assumption of the absence of a particular pattern in a set of data. The null hypothesis, denoted by H0, is put forward to be rejected in order to support an → alternative hypothesis.

null; → hypothesis.

null lens
  عدسی ِ نول   
adasi-ye nul

Fr.:   

A lens used in the optical testing of an aspheric surface. It converts a spherical wavefront into one that precisely matches the surface under test. When the wavefront is reflected from that surface, it reverses its path and, if the surface is perfect, results in a perfect emerging spherical wavefront, which is easily evaluated.

null; → lens.

null matrix
  ماتریس ِ نول   
mâtris-e nul

Fr.: matrice nulle   

An m × n matrix whose elements are all zeros. Also known as zero matrix.

null; → matrix.

null method
  روش ِ نول   
raveš-e nul

Fr.: méthode de zéro   

A method of comparing, or measuring, forces, electric currents, etc., by so opposing them that the pointer of an indicating apparatus remains at, or is brought to, zero, as contrasted with methods in which the deflection is observed directly. Same as zero method.

null; → method.

nuller
  نولگر   
nulgar

Fr.:   

A device using the → nulling interferometry technique.

Agent noun of the verb → null.

nulling fraction (NF)
  برخه‌ی ِ نولش   
barxe-ye nuleš

Fr.: fraction de phase d'arrêt   

The fraction of time that a → pulsar undergoes → pulse nulling. For most → nulling pulsars this fraction can range from zero (for the → Vela pulsar) to more than 50%.

null; → -ing; → fraction.

nulling interferometry
  اندرزنش‌سنجی ِ نولی   
andarzanešsanj-ye nuli

Fr.: interférométrie annulante   

A technique for blocking the light of a bright source in order to reveal a faint source near it. This technique uses destructive → interference between two or more → coherent beams from a number of telescopes to make the bright center dark. Nulling interferometry can be used to search the region immediately around a star for → extrasolar planets and → circumstellar dust clouds by suppressing the star's glare.

Nulling, from → null; → interferometry.

nulling pulsar
  پولسار ِ نولنده   
pulsâr-e nulandé

Fr.: pulsar à phase d'arrêt   

A → pulsar that undergoes → pulse nulling.

null; → -ing; → pulsar.

number
  ۱) عدد، شماره؛ ۲) شمار   
1) adad (#), šomâré (#); 2) šomâr (#)

Fr.: 1) nombre, numéro; 2) numéro   

1) Any real or complex numeral quantity.
2) The sum, total, count, or aggregate of a collection of units.

From M.E. nombre, from O.Fr. nombre, from L. numerus "a number, quantity," from PIE base *nem- "to divide, distribute, allot."

Adad, loan from Ar.
Šomâr, šomâré, noun from šomârdan "to count, reckon, calculate, enumerate, account for," from Mid.Pers. ôšmârtan; Av. base (š)mar- "to have in mind, remember, recall," pati-šmar- "to recall; to long for," hišmar-; cf. Skt. smar- "to remember, become aware," smarati "he remembers;" L. memor, memoria; Gk. mermera "care," merimna "anxious thought, sorrow," martyr "witness."

number density
  چگالی ِ عددی   
cagâli-ye adadi

Fr.: densité nmérique   

Number of a particular type of object found in each unit volume.

number; → density.

<< < -es -iv -ti 21 a p abe abs abs aca acc acc acr act ada adh Adr aer AGB air Alf Alg all alp alt AM amo ana And ang ani ano Ant Ant apa apo app app Ara Arc ari Arr ash ass ast ast asy atm ato att aut ave axi Bab bal Bal bar bar bea Bek Bes bia Big bin bin bip biv bla bli blu Boh Bol Bos bou bra bri bro buo cal cal can cap car Car cat cat CCD Cen cen CH cha cha che Che chr cir cir cit cla clo clo clu Coa coe coh col col col com com com com com com com com Com con con con con con con con con con con con con Cop Cor cor cor cos cos cou cou Cow cre cri cro cry cur cya Cyg dan dar dat de- deb dec dec ded def deg del dem den dep des det dev dia dif dif dih dio Dir dis dis dis dis dis dis DO don dou dow dro dur dwa dyn Dys ear ebb ecl edg egg Ein Ela ele ele ele ele ell eme emp enc eng ent epi equ equ equ esc eth Eur Eve exa exc exe exi exp exp ext ext ext fac fal far fed Fer fer fie fin fir fis fla flo flu fol for for fou fra fre Fre fro fut G-t gal gal gam gas Gau Gem gen geo geo geo gia Gli Gol gra gra gra gra gre gri gui H I Hag hal har hat He- hea hel Hel her Hes hie hig his hom hor hot Hub Hug hur hyd hyd hyg hyp ice ide ima Ima imp imp inc inc ind ine inf inf inf ing inn ins ins int int int int int int int int inv Io ion iro isl iso iso Jac jet jud jur Kel Kep kil Klo Kui Lag lam Lap Lar lat law lea len lep Lib lig lim lin lin Lio lit loc LOF lon Lor low lum lun Lup Lyo mac mag mag mag mag mag mai man Mar mas mas mat Max mea mec Meg Mer Mer met met Met mic Mid Mil min Mir mit mod mod mol mon Mor mou mul mul mys nan Nat nau nec neo neu nev New NGC no nom non non nor not nuc nuc num nut obj obs obs occ ocu oft ome Oor ope opp opt opt orb ord ori ort osc out ove oxi pai pan par par par par pas pea pen per per per per Per per pha phi pho pho pho phy pio Pla pla pla pla Pla plu Poi pol pol pol poo pos pos pot pra pre pre pre pre pri pri pro pro pro pro pro Pro pro pse pul pur qua qua qua qua que rac rad rad rad rad rad rad ran rar ray rea rea rec rec red red ref ref reg rel rel rel ren res res res res ret rev Ric rig rin roc roo rot rot Rus Sac sal sat sca sca Sch sci Scu sec sec Sed sel Sel sen ser Sex Sha she sho sid sig sil sim sin siz sla Sma sno sof sol sol sol sol sou sou spa spa spe spe spe sph spi spi spr squ sta sta sta sta ste ste ste Sto Str str str sub sub suc sun sup sup sup sup sur swa syn syn tab tar tek tem ter tes the the the the Tho thr tid tim Tis Too Tor tra tra Tra tra tra tri tri tru Tul tur two Typ ult un- und uni uni unk upp Urc utt val var vec vel ver vib vio vir vis voi vor wan wat wav wax wea Wei whi Wil win WN9 wor X-r yel you zer zod > >>