degaršod-e bidarrow, degareš-e ~
Fr.: changement adiabatique
A change taking place in a system that has perfect thermal insulation, so that heat cannot enter or leave the system and energy can only be transferred by work.
degaršod-e hanjârvâr, degareš-e ~
Fr.: changement canonique
A periodic change in one of the components of the orbit of a celestial object.
1) degaršod, degarkard, degareš, âleš 2) degar šodan (#), degar kardan (#), âlešidan, degaridan
Fr.: 1) changement; 2) changer
1) The act of changing; alteration or variation of any kind.
→ adiabatic change,
→ canonical change,
→ polytropic change,
→ secular change,
M.E., from O.Fr. changier, from L.L. cambiare, from L. cambire "to exchange, barter," of Celtic origin, cf. Breton kamm "curved, bent;" Gk. kampe "a corner, a joint;" L. campus "a field;" Lith. kampus "corner;" PIE *kamb- "to bend, crook."
Degaršod, from degar, digar "another, other"
(Mid.Pers. dit, ditikar
"the other, the second," O.Pers. duvitiya- "second,"
Av. daibitya-, bitya- "second," Skt. dvitiya- "second,"
PIE *duitiio- "second")
+ šod, past stem and contracted infinitive of
šodan "to become; to be; to be elapsed;"
(Mid.Pers. šutan, O.Pers.
šyav-, Av. šav-, šyav-
"to move, to go away from" (perf. ptcpl. pass. šuta-);
cf. Skt. cyavate "stirs himself, goes," stem cyu-,
Gk. kinein "to move," L. ciere "to move, set in motion,
stir," PIE *kei- "to move to and fro"); degarkard with kardan,
→ -ize; degaridan, infinitive from degar +
-idan, → -ize.
Fr.: échande de charge
A collisional process in which an → ion collides with a neutral → atom or → molecule and captures one of its electrons. One of the most important charge-exchange processes occurring in the → interstellar medium is: O+ + H → H+ + O + 0.020 eV.
1) gahulidan (#); 2) gahul, gahuleš
Fr.: 1) échanger; 2) échange
O.Fr. eschangier, from V.L. *excambiare, from L. → ex- "out" + cambire "barter."
Mod.Pers. gahulidan "to exchange," Kurd. guhartin/guhêr- "to exchange," Mid.Pers. wihir "to change," wihirišn "change," Manichean Mid.Pers. hr'g; Buddhist Mid.Pers. hlg "duty, tribute; work, effort;" Arm. loanword hark "duty, tribute;" Ar. loanword xarj "expense," xarâj "land, property tax;" Proto-Iranian *har- "to barter, trade; to pay tribute;" IE cognates: Gk. elein "to take (by force)," elor "loot, booty, catch;" Goth. saljan "to bring, to sacrifice;" O.E. sellan "to hand over, sell;" O.H.G. sala "delivery of goods."
Fr.: force d'échange
The force that governs the exchange of particles in the interaction between bodies. → exchange particle.
Fr.: particule d'échange
In quantum field theory, a particle that transfers momentum and energy between interacting objects, and is said to mediate the interaction. All four of the fundamental forces involve the exchange of one or more particles. For example, photon is the exchange particle of the electromagnetic force.
degaršod-e bolgašti, degareš-e ~
Fr.: changement polytropique
Prevost's law of exchanges
qânun-e gahuleš-e Prévost
Fr.: loi des échanges de Prévost
A statement concerned with thermodynamic heat exchange, according to which bodies in → thermal equilibrium are simultaneously absorbing and emitting radiant energy. A body radiates in the same way whether other bodies are present or not. Also called Prevost's theory of exchanges.
degaršod-e diryâz, degareš-e ~
Fr.: changement séculaire
A continuous, non-periodic change in one of the attributes of the states of a system. Often, a change in an orbit due to dissipation of energy. See also → canonical change.