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
non-principal axis (NPA) rotational motion
  جنبش ِ چرخشی به گرد ِ آسه‌ی ِ نا-فرین   
jonbeš-e carxeši be gerd-e âse-ye nâ-farin

Fr.: mouvement rotationnel autour de l'axe non-parincipal   

A → tumbling motion of an → asteroid. See also → tumbling asteroid.

non-; → principal axis; → rotational; → motion.

non-radial pulsation
  تپش ِ ناشعاعی   
tapeš-e nâšo'âyi

Fr.: pulsation non-radiale   

A type of stellar pulsation in which waves run in different directions on and beneath the surface of a star.

non-; → radial; → pulsation.

non-radiative process
  فراروند ِ ناتابشی   
farâravand-e nâtâbeši

Fr.: processus non radiatif   

An process in which an excited state returns to the ground state without emitting radiation. → radiative process.

non-; → radiative; → process.

non-relativistic
  ناباز‌آنیگی‌مند   
nâ-bâzânigi-mand

Fr.: non-relativiste   

Not concerned with or based on the → theory of relativity. See also:
non-relativistic electron, → non-relativistic mechanics, → relativistic.

non-; → relativistic.

non-relativistic electron
  الکترون ِ ناباز‌آنیگی‌مند   
elektron-e nâ-bâzânigi-mand

Fr.: électron non-relativiste   

An electron that does not experience relativistic effects since its velocity is very small compared to that of light.

non-relativistic; → electron.

non-relativistic mechanics
  مکانیک ِ ناباز‌آنیگی‌مند   
mekânik-e nâ-bâzânigi-mand

Fr.: mécanique non-relativiste   

Mechanics in which the masses under consideration move at speeds much slower than the speed of light.

non-relativistic; → mechanics.

non-thermal
  ناگرمایی   
nâgarmâyi

Fr.: non thermique   

The nature of a → non-thermal radiation.

non-; → thermal.

non-thermal emission
  گسیل ِ ناگرمایی   
gosil- nâgarmâyi (#)

Fr.: émission non thermique   

non-thermal radiation.

non-thermal; → emission.

non-thermal filament (NTF)
  رشته‌ی ِ ناگرمایی   
rešte-ye nâgarmâyi

Fr.: filament non thermique   

Any of many long and slender structures visible in → radio continuum images of the inner hundred parsecs of the → Galactic Center. NTFs are typically tens of parsecs long and only a fraction of parsec wide. They may occur in isolation or in bundles, such as those comprising the linear portion of the prominent → radio Arc. Their → non-thermal spectrum and strong → linear polarization indicate → synchrotron radiation. The magnetic fields in the NTFs have been estimated from various means. Early estimates centered on the radio Arc, and focused on a comparison between the → magnetic pressure and the estimated → ram pressure from nearby → molecular cloud interactions, indicated magnetic field strengths as high as 1 mG (Morris and Yusef-Zadeh 1985). More recent observations, however, have pointed to significantly weaker magnetic fields among the population of NTFs. Synchrotron models of the radio spectrum imply equipartition magnetic fields between 50-200 μG. Theoretically, it has been challenging to understand the nature of these filaments that resemble extragalactic → radio jets but are not accompanied with any obvious source of acceleration of charged particles to high energy → relativistic energies. Although a number of detailed models have been considered, there is no consensus as to the origin of the NTFs. These models suggest that molecular and ionized gas clouds, mass-losing stars, → Galactic winds, magnetic activity of the → supermassive black hole at the Galactic center, and → lepton production due to → dark matter annihilation play a role in the processes that lead to the production of the NTFs (Linden et al. 2011, ApJ 741,95, and references therein). In most models, the magnetic field is strong and its global geometry in the central region of the Galaxy is considered to be → poloidal and static. However, some recent models have argued that the magnetic field is local and dynamic.

non-thermal; → filament.

non-thermal radiation
  تابش ِ ناگرمایی   
tâbeš-e nâgarmâyi (#)

Fr.: rayonnement non thermique   

The electromagnetic radiation whose characteristics do not depend on the temperature of the emitting source. In contrast to → thermal radiation, it has a different spectrum from that of → blackbody radiation. The three common types of non-thermal radiation in astronomy are: → synchrotron radiation, → bremsstrahlung radiation, and → maser  → stimulated emission.

non-thermal; → radiation.

non-thermal spectrum
  بیناب ِ ناگرمایی   
binâb-e nâgarmâyi

Fr.: spectre non thermique   

A radio emission with a negative → spectral index. In this type of emission the intensity of the emitted radiation increases with wavelength.

non-thermal; → spectrum.

non-zero
  نا-صفر   
nâ-sefr

Fr.: non zéro, non nul   

Not equal to zero.

non-; → zero.

non-zero polynomial
  بلنامین ِ نا-صفر   
bolnâmin-e nâ-sefr

Fr.: polynôme non nul   

A → polynomial that at least has one non-zero → coefficient. See also → zero polynomial.

non-zero; → polynomial.

noncoherent scattering
  پراکنش ِ ناهمدوس   
parâkaneš-e nâhamdus

Fr.: diffusion incohérente   

The absorption of a photon and its re-emission at a different frequency (in the observer's frame of reference) by scattering atoms.

non-; → coherent scattering.

noncollisional plasma
  پلاسمای ِ نا-همکوبشی   
pelâsmâ-ye nâ-hamkubeši

Fr.: plasma non-collisionnel:   

A plasma in which the → mean free path of the charged particles between two collisions is much larger than the size of the system containing the plasma.

non-; → collisional; → plasma.

nondimensional equation
  هموگش ِ ناوامونی   
hamugeš-e nâvâmuni

Fr.: équation non-dimensionnelle   

An equation that is independent of the units of measurement as it only involves nondimensional numbers, parameters, and variables.

non-; → dimensional; → equation.

nonempty
  ناتهی   
nâtohi (#)

Fr.: non vide   

Describing something that is partially or totally occupied.

non; → empty.

nonempty set
  هنگرد ِ ناتهی   
hangard-e nâtohi

Fr.: ensemble non vide   

A set containing at least → one → element.

nonempty; → set.

nonexistence
  ناهستومندی، ناهستی   
nâhastumandi, nâhasti

Fr.: non existence   

Math.: The fact that no → solution exists for a given → problem. In mathematics, nonexistence usually is a matter of impossibility.

non-; → existence.

nonfuzzy
  ناپرزوار   
nâporzvâr

Fr.: non flou   

Not → fuzzy. → nonfuzzy set.

non-; → fuzzy.

<< < -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 > >>