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relativistic spin precession 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 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 bâzânigi Fr.: relativité General: The state or fact of being relative. |
relativity of simultaneity 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 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 negare-ye bâzânigi Fr.: théorie de la relativité The → theory of relativity. → theory; → relativity. |
relativize bâzâni kardan Fr.: relativiser To regard as or make one thing relative to something else. |
relax 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 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. Verbal noun of → relax. |
relaxation time 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 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 ask (#) Fr.: relais General: The act of passing something along from one person, group, or
device to another. 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 asb→ horse. |
relevance dabustegi Fr.: pertinence The quality or condition of being → relevant. |
relevant dabuste Fr.: pertinent Closely related, connected, or pertinent to the matter at hand. From Fr. relevant "depending upon," from M.L. relevantem (nominative relevans), from stem of L. relevare "to lessen, lighten," from intensive prefix → re- + levare "to lift up, lighten," from levis "not heavy;" from PIE root *legwh- Dabuste, from Gilaki dabuste "tied, bound," from Gilaki dabustan "to tie, bind, close," variants dabastan, Mâzandarâni davəstən; Pers. bastan "to tie, bind, shut, close" (Mid.Pers. bastan/vastan "to bind, shut," Av./O.Pers. band- "to bind, fetter," banda- "band, tie," Skt. bandh- "to bind, tie, fasten," PIE *bhendh- "to bind," cf. Ger. binden, E. bind). |
reliability ostigâni Fr.: fiabilité 1) The state or quality of being reliable. |
reliable 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 dâdehâ-ye ostigân Fr.: données fiables Data which are not affected by sampling error or bias. |
reluctance 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 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. |
remain 1) mândan; 2) bâzmândan Fr.: rester 1) To continue in the same state. M.E. remainen, from O.Fr. remain-, stressed stem of remanoir "to stay, dwell, remain," from L. remanere "to remain, to stay behind; be left behind," from → re- "back" + manere "to stay, remain" (from PIE root *men- "to remain," cf. Pers. mân-, mândan, as below. Mândan "to remain, stay" (mân "house, home;" Mid.Pers. mândan "to remain, stay;" O.Pers. mān- "to remain, dwell;" Av. man- "to remain, dwell; to wait;" Gk. menein "to remain;" L. manere "to stay, abide" (Fr. maison, ménage; E. manor, mansion, permanent); PIE base *men- "to remain, wait for." |
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