An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



<< < cir nuc > >>

Number of Results: 39 Search : clear

Fr.: circumnucléaire   

Situated around a → nucleus, as of a → circumnuclear disk.

circum- + → nuclear.

circumnuclear disk
  گرده‌ی ِ پیراهسته‌ای   
gerde-ye pirâhasteyi

Fr.: disque circumnucléaire   

A thick disk of gas and dust clouds surrounding the → Galactic Center up to about 20 → light-years. The disk is very clumpy; the → clumps have densities of several 105 particles/cm3, radii of about 0.3 light-years, and gas temperatures above 100 K. The hydrogen mass of the disk is a few 104 → solar masses. Such circumnuclear disks are present also in other galaxies.

circumnuclear; → disk.

runé (#)

Fr.: clair   

1) Free from darkness, obscurity, or cloudiness.
2) Transparent; pellucid.
3) Without discoloration, defect, or blemish ( → clear night.

M.E. clere, from O.Fr. cler, from L. clarus "clear, bright, distinct."

Runé, from Kurd. (Sorani) rûn "bright, clear," rûn kirdin "to explain," variant of rowšan, → bright.

clear night
  شب ِ رونه   
šab-e runé

Fr.: nuit claire   

A night sky without clouds, mist, or haze, atmospheric dust particles, and without city lights in which a sixth magnitude star is visible by naked-eye.

clear; → night.

homonuclear molecule
  مولکول ِ هم‌هسته   
molekul-e ham-hasté

Fr.: molécule homonucléaire   

A molecule that is composed of only one type of → chemical element, e.g. the → molecular hydrogen and → ozone.

homo-; → nuclear; → molecule.

low-ionization nuclear emission-line region
  ناحیه‌ی ِ هسته‌ای با خط ِ گسیلی ِ کم‌یونش   
nâhiye-ye hasteyi bâ xatt-e gosili-ye kamyoneš (#)

Fr.: Noyau de galaxie à raies d'émission de faible ionisation   

Same as → LINER.

low; → ionization; → nuclear; → emission; → line; → region.

haste-yi (#)

Fr.: nucléaire   

Of or pertaining to a → nucleus.

From nucle(us), → nucleus, + -ar variant of the adjective-forming suffix → -al.

Haste-yi, from hasté, → nucleus, + -i adjective-forming suffix.

nuclear barrier
  ورغه‌ی ِ هسته‌ای   
varqe-ye haste-yi (#)

Fr.: barrière nucléaire   

The region of high potential energy through which a charged particle must pass on entering or leaving an atomic nucleus. → Gamow barrier.

nuclear; → barrier.

nuclear burning
  سوزش ِ هسته‌ای   
suzeš-e haste-yi

Fr.: combustion nucléaire   

A → nuclear reaction inside a star that produces the energy to make the star shine and also transform chemical elements into others.

nuclear; → burning.

nuclear charge
  بار ِ هسته‌ای   
bâr-e haste-yi (#)

Fr.: charge nucléaire   

The positive electric charge on the nucleus of an atom.

nuclear; → charge.

nuclear combustion
  سوزش ِ هسته‌ای   
suzeš-e haste-yi

Fr.: combustion nucléaire   

nuclear burning.

nuclear; → combustion.

nuclear cross-section
  سکنج‌گاه ِ هسته‌ای   
sekanjgâh-e hasteyi

Fr.: section efficace nucléaire   

Apparent cross-section possessed by an atomic nucleus when it undergoes a particular type of collision process.

nuclear; → cross section.

nuclear density
  چگالی ِ هسته‌ای   
cagâli-ye haste-yi (#)

Fr.: densité nucléaire   

The density of an atomic nucleus (about 1014 g/cm3).

nuclear; → density.

nuclear energy
  کاروژ ِ هسته‌ای   
kâruž-e haste-yi

Fr.: énergie nucléaire   

Energy released during a nuclear reaction as the result of the conversion of mass into energy. → mass-energy equivalence.

nuclear; → energy.

nuclear fission
  شکافت ِ هسته‌ای   
šekâft-e haste-yi (#)

Fr.: fission nucléaire   

A → nuclear reaction in which a heavy atomic nucleus splits into two or more approximately equal parts, usually as the result of the capture of a slow, or → thermal neutron by the nucleus. It is normally accompanied by the emission of further neutrons or → gamma rays and very large amounts of energy. The neutrons can continue the process as a → chain reaction, so that it becomes the source of energy in a → nuclear reactor or an atomic bomb. It may also be a trigger for → nuclear fusion in a hydrogen bomb. Fission occurs spontaneously in nuclei of uranium-235, the main fuel used in nuclear reactors.

nuclear; → fission.

nuclear force
  نیروی ِ هسته‌ای   
niru-ye haste-yi (#)

Fr.: force nucléaire   

The attractive force which acts between nucleons when they are extremely close together (closer than 10-13 cm).

nuclear; → force.

nuclear fuel
  سوخت ِ هسته‌ای   
suxt-e haste-yi (#)

Fr.: combustible nucléaire   

A substance, such as uranium-238 or plutonium-239, which undergoes nuclear fission in a nuclear reactor.

nuclear; → fuel.

nuclear fusion
  ایوش ِ هسته‌ای   
iveš-e haste-yi

Fr.: fusion nucléaire   

A → nuclear reaction between atomic nuclei as a result of which a heavier → atomic nucleus is formed, a small fraction of mass is lost, and a large quantity of energy is released. Nuclear fusion is the source of the energy of stars.

nuclear; → fusion.

nuclear magnetic resonance (NMR)
  باز‌آوایی ِ مغناتیسی ِ هسته‌ای   
bâzâvâyi-ye meqnâtisi-ye haste-yi

Fr.: résonance magnétique nucléaire   

An analysis technique applied to some atomic nuclei that have the property to behave as small magnets and respond to the application of a magnetic field by absorbing or emitting electromagnetic radiation. When nuclei which have a magnetic moment (such as 1H, 13C, 29Si, or 31P) are submitted to a constant magnetic field and at the same time to a radio-frequency alternating magnetic field, the nuclear magnetic moment is excited to higher energy states if the alternating field has the specific resonance frequency. This technique is especially used in spectroscopic studies of molecular structure and in particular provides valuable information in medicine that can be used to deduce the structure of organic compounds.

nuclear; → magnetic; → resonance.

nuclear magnetism
  مغناتیس ِ هسته‌ای   
meqnâtis-e haste-yi (#)

Fr.: magnétisme nucléaire   

The magnetism associated with the magnetic field generated by atomic nuclei.

nuclear; → magnetism.

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