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: 12948 Search : far
relativistic quantum mechanics
  کو‌آنتوم مکانیک ِ بازانیگی‌مند   
kuântom mekânik-e bâzânigimand

Fr.: mécanique quantique relativiste   

A quantum theory that incorporates special relativity, for example, → quantum electrodynamics.

relativistic; → quantum mechanics.

relativistic redshift
  سرخ‌کیب ِ بازانیگی‌مند   
sorx kib-e bâzânigimand

Fr.: décalage vers le rouge relativiste   

A redshift caused by the → relativistic Doppler effect. → gravitational redshift.

relativistic; → redshift.

relativistic speed
  تندی ِ بازانیگی‌مند   
tondi-ye bâzânigimand

Fr.: vitesse relativiste   

Same as → relativistic velocity.

relativistic; → speed.

relativistic spin precession
  پیشایان ِ آسه‌ی ِ چرخش ِ بازانیگی‌مند   
pišâyân-e âse-ye carxeš-e bâzânigi-mand

Fr.: précession de l'axe de rotation relativiste   

The change in the direction of the → rotation axis of a → pulsar in a → binary pulsar. In such a system, → geodetic precession leads to a relativistic → spin-orbit coupling, analogous of → spin-orbit coupling in atomic physics. In consequence, the pulsar spin precesses about the total → angular momentum, changing the relative → orientation of the pulsar toward Earth (Damour & Ruffini, 1974). As a result, the angle between the pulsar → rotation axis and our → line of sight changes with time, so that different portions of the emission beam can be observed leading to changes in the measured pulse profile. In extreme cases, the precession may even move the beam out of our line of sight and the pulsar may disappear as predicted for PSR 1913+16 for the year 2025.

relativistic; → spin; → precession.

relativistic velocity
  تندای ِ بازانیگی‌مند   
tondâ-ye bâzânigimand

Fr.: vitesse relativiste   

The velocity of a body when it is a significant fraction of the → speed of light.

relativistic; → velocity.

relativity
  بازانیگی   
bâzânigi

Fr.: relativité   

General: The state or fact of being relative.
Physics: 1) Short for the → Galilean relativity.
2) Short for the → relativity theory of Einstein.

Relativity, from → relative + → -ity.

relativity of simultaneity
  بازانیگی ِ همزمانی   
bâzânigi-ye hamzamâni

Fr.: relatitivité de simultanéité   

A basic concept of → special relativity whereby → events that are simultaneous in one → reference frame are not simultaneous in another reference frame moving with respect to the first.

relativity; → simultaneity.

relativity principle
  پروز ِ بازانیگی   
parvaz-e bâzânigi

Fr.: principe de relativité   

The requirement employed by Einstein in his relativity theories, that the equations describing the laws of physics are the same in all frames of reference. This statement and that of the constancy of the speed of light constitute the founding principles of special relativity.

Relativity; → principle.

relativity theory
  نگره‌ی ِ بازانیگی   
negare-ye bâzânigi

Fr.: théorie de la relativité   

The → theory of relativity.

theory; → relativity.

relativize
  بازانی کردن   
bâzâni kardan

Fr.: relativiser   

To regard as or make one thing relative to something else.

relative + → -ize.

relax
  واهلیدن   
vâhelidan (#)

Fr.: relaxer, se relaxer   

To lessen the force, strength or intensity of something.

m M.E., from O.Fr. relaxer from L. relaxare "relax, loosen, open," from → re- "back" + laxare "loosen," from laxus "loose."

Vâhelidan, from vâ-, → re-, + helidan, heštan "to place, put" from Mid.Pers. hištan, hilidan "to let, set, leave, abandon;" Parthian Mid.Pers. hyrz; O.Pers. hard- "to send forth," ava.hard- "to abandon;" Av. harəz- "to discharge, send out; to filter," hərəzaiti "releases, shoots;" cf. Skt. srj- "to let go or fly, throw, cast, emit, put forth;" Pali sajati "to let loose, send forth."

relaxation
  واهلش   
vâheleš (#)

Fr.: relaxation   

1) The evolution of the properties of a physical system which has been disturbed and which regains its equilibrium condition once the disturbing action has ceased. Relaxation is the response of the system to the perturbation. The time required by the system to regain its condition of minimum energy is called the → relaxation time.
2) Math.: In numerical analysis, a method of solving equations in which the errors, or residuals, resulting from an initial approximation are reduced by succeeding approximations until finally all are within the toleration limit.

Verbal noun of → relax.

relaxation time
  زمان ِ واهلش   
zamân-e vâhaleš

Fr.: temps de relaxation   

The characteristic length of time that is required for a system undergoing → relaxation to move to its equilibrium state. If the system follows an exponential law G = G0 exp(-t / τ), the relaxation time is the time required for G to obtain the fraction 1/e of its initial value G0.

relaxation; → time.

relaxed system
  راژمان ِ واهلیده   
râžmân-e vâhalidé

Fr.: système relaxé   

A → dynamical system that has regained its → equilibrium. Especially a system in which the kinetic and potential energies obey a specific relationship known as the → virial theorem.

P.p. from relax, → relaxation.

relay
  اسک   
ask (#)

Fr.: relais   

General: The act of passing something along from one person, group, or device to another.
Electronics: An electronic or electromechanical switching device, typically operated by a low voltage, that controls a higher-voltage or higher-power circuit and turns it on or off.
A device consisting of a receiver and a transmitter, used to receive and retransmit signals.

M.E. relaien "to unleash fresh hounds in a hunt," from M.Fr. relai "reserve pack of hounds or other animals," from O.Fr. relaier "to exchange tired animals for fresh," literally "to leave behind," from → re- "back" + laier "to leave."

Ask "relay horse kept in stations for the use of messengers," maybe from asbhorse.

reliability
  استیگانی   
ostigâni

Fr.: fiabilité   

1) The state or quality of being reliable.
2) A statement of the error or precision.

reliable; → -ity.

reliable
  اُستیگان   
ostigân (#)

Fr.: fiable   

Able to be trusted to be accurate or to provide a correct result.

From rely, from O.Fr. relier "fasten, rally, oblige," from L. religare "fasten, bind fast," from → re-, intensive prefix, + ligare "to bind" + → -able.

Ostigân, from Mid.Pers. ostigân "reliable, firm, sure," from ost "firm, reliable."

reliable data
  داده‌های ِ استیگان   
dâdehâ-ye ostigân

Fr.: données fiables   

Date which are not affected by sampling error or bias.

reliable; → data.

reluctance
  ستهی   
setehi (#)

Fr.: réluctance   

The ratio of the magnetomotive force acting in a magnetic circuit to the magnetic flux. Also called magnetic resistance, it is analogous to resistance in an electrical circuit.

Reluctance "act of struggling against;" L. reluctari "to struggle against," from → re- "against" + luctari "to struggle."

Setehi "contention, litigation," related to setihidan "to quarrel, brawl," setiz, "battle, combat, conflict," setizidan "to fight;" Mid.Pers. stêzag "quarrel, strife;" Av. stij- "battle;" cf. Skt. steg- "to assail;" Gk. stizein "to prick, puncture," stigma "mark, puncture;" O.E. stician "to pierce, stab;" E. stick (v.); PIE *steig- "to sting, stab."

rem
  رم   
rem (#)

Fr.: rem   

A unit used for measuring the effective dose of radiation received by a living organism. It is the quantity of radiation whose biological effect is equal to that produced by one → roentgen of → X-rays. 1 rem = 0.01 sievert (Sv) or 10 → millisieverts.

Rem, acronym for roentgen equivalent: man. The unit was introduced in 1944 by Herbert M. Parker (1910-1984), a radiation physicist and co-inventor of the Paterson-Parker Radium Therapy System.

<< < -es -iv -ti 21- A r abe abs abs acc acc acc act act ada adi adu aff age alc Alf ali all alp alt ama amp ana ang ang ann ano ant ant ape apo app aps arc Arg ari art ass ast ast ast atm ato att aur aut axi B r bac Bal Bar Bar Bay bec Ber Bet Bie bij bin bio bis bla bla blu blu bol Bor bou Bra bre bro Bug C-s cal Cam can car Car Cas cat cav cel cen cer Cha cha cha che cho cir cir cir 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 coo cor cor cor cos cos cos Cou cou Cra Cre cri cro cub cur cyc cyl dar dat daw de- Deb dec dec dee def deg del Den dep der det deu dew dic dif dif dil dip dir dis dis dis dis dis div dog Dop dou dra dua dus dwa dyn e-m ear ecl eco eff ein Ein elb ele ele ele ele Els emi emp ene enr env epi equ equ Eri est Euc eva evo exc exc exh exo exp exp ext ext f-n Fah fam fau fee Fer fib fil fin fir fix fle flu foc for for for fra fre fre fri fun fuz gal gal gal Gan gau GCN gen geo geo geo geo Gl glo gra gra gra gra gra gre gro GW1 hab hal han HAR haz hea hel hel Hen Her heu Hig Hil hol hop hor hou Hub Hum Hyd hyd hyd hyp hys ide ign ima imp imp inc inc ind ine inf inf inf inh INP ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jos Jun K2 Kep key kin Kol lag lam Lan lar las lav lea leg len lev lig lim lin lin lin lis lob loc log lor low lum lun lun Lym Mac mag mag mag mag mag mai Mal mar mas mas mat max mea mea mee Men mer met met met mic mid Mil min Mir mix mod mod mol mon Mor mou mul muo mys nan nat nav nec Nep neu New New NGC nob nom non non nor not nuc nuc num Nyq obj obs obs oce oen OH omn opa ope opt opt opt orb ord Ori ort osc out ove oxy pal pan par Par par par pas pea Pen per per per per per pet pha pho pho pho phy pie Pit Pla pla pla pla ple Poi pol pol pol pol pop pos pos pow pre pre pre Pre pri pri pri pro pro pro pro pro pro Pro pub pul pyr qua qua qua qua Qui rad rad rad rad rad rad ram ran rat rea rec rec rec red ref ref reg reg rel rel rem rep res res res ret rev rho Rie rim riv rol Ros rot rul S a Sah san Sat sca Sch Sch scr sec sec sec sei sel sem sep set sha she sho sid sig sil sim sin sit sky slu sno sof sol sol sol sol sou sou spa spa spe spe spe sph spi spl spr sta sta sta sta sta ste ste sti sto str str sub sub sub sug sun sup sup sup sup sur syl syn sys tal Tay tel ten ter tex the the the thi tho thu tid tim tod top tot tra tra tra tra tri tri tro tru tur twi Typ UFO ult unc uni uni uni upg ura uti val var vec vel ver ver vig vir vis voc von wak Was wav wax wea wei whi Wie win WN6 wom X-r yel you zer zod > >>