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: 8 Search : loss
hysteresis loss
  دست‌رفت ِ پسماندی   
dastraft-e pasmândi

Fr.: perte par hystérésis   

Dissipation of energy which occurs, due to magnetic hysteresis, when the magnetic material is subject to changes of magnetization.

hysteresis; → loss.

loss
  دسترفت   
dastraft

Fr.: perte   

In physics, a measure of the energy, mass, or other physical quantities lost in a system, by conversion or external effects.

From O.E. los "loss, destruction," from P.Gmc. *lausa, from PIE base *leu- "to loosen, divide, cut apart, untie, separate" (cf. Gk. lyein "to loosen, untie, slacken," lysus "a loosening;" L. luere "to loose, release, atone for;" Skt. lunati "cuts, cuts off," lavitram "sickle;" Pers. las "loose," "slit, cut;" → analysis).

Dastraft, literally "gone from hand," from dast "hand" (Mid.Pers. dast; O.Pers. dasta-; Av. zasta-; cf. Skt. hásta-; Gk. kheir; L. praesto "at hand;" Arm. jern "hand;" Lith. pa-žastis "arm-pit;" PIE *ghes-to-) + raft p.p. of raftan "to go, elapse, glide by, depart" (Mid.Pers. raftan, raw-, Proto-Iranian *rab/f- "to go; to attack").

low-loss fiber
  فیبر ِ کم‌دسترفت   
fibr-e kamdastraft

Fr.: fibre à faible perte   

Optical fiber that transmits a greater percentage of input light than does high-loss step-index fiber.

low; → loss; → fiber.

mass loss
  دسترفت ِ جرم   
dastraft-e jerm

Fr.: perte de masse   

The outpouring of particles and gas from a star, occurring at varying rates and by a variety of processes throughout a star's lifetime. → Bipolar flows are believed to be due to mass loss by forming → protostars, while → massive stars lose their mass through powerful → stellar winds.

mass; → loss.

mass loss rate
  نرخ ِ دسترفت ِ جرم   
nerx-e dastraft-e jerm

Fr.: taux de perte de masse   

The rate with which the → mass loss process takes place, usually expressed in → solar mass per year. → radiation-driven mass loss. The mass loss rate and the → terminal velocity are anti-correlated, since the → wind momentum is constant, → bi-stability jump.

mass loss; → rate.

Ohmic loss
  دسترفت ِ اهمی   
dastraft-e Ohmi

Fr.: perte ohmique   

Same as → Ohmic dissipation.

Ohmic; → loss.

radiation-driven mass loss
  دسترفت ِ جرم از راه ِ باد ِ تابشی   
dastraft-e jerm az râh-e bâd-e tâbeši

Fr.: perte de masse par vent radiatif   

The → mass loss experienced by a → massive star due to the effect of → radiation-driven wind.

radiation; driven, p.p. of → drive; → mass; → loss.

transmission loss
  دسترفت ِ تراگسیل   
dastraft-e tarâgosil

Fr.: perte de transmission   

A decrease in power in transmission from one point to another.

transmission; → loss.