An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 1301
static
  ایستا   
istâ (#)

Fr.: statique   

1) Pertaining to bodies, forces, charges, etc. that act in equilibrium; at rest; stationary.
2) Pertaining to → statistics.

From Mod.L. statica, from Gk. statikos "causing to stand," from stem of histanai "to cause to stand," cognate with Pers. istâdan "to stand," as below.

Istâ "standing, static," from istâdan "to stand" (Mid.Pers. êstâtan; O.Pers./Av. sta- "to stand, stand still; set;" Av. hištaiti; cf. Skt. sthâ- "to stand;" Gk. histemi "put, place, weigh," stasis "a standing still;" L. stare "to stand;" Lith. statau "place;" Goth. standan; PIE base *sta- "to stand").

static equilibrium
  ترازمندی ِ ایستا   
tarâzmandi-ye istâ

Fr.: équilibre statique   

The state of a rigid body which is not moving at all. The conditions for static equilibrium are: 1) the sum of the external forces on the object must equal zero, and 2) the sum of the → torques must equal zero. See also → dynamic equilibrium and → mechanical equilibrium.

static; → equilibrium.

static limit
  حد ِ ایستا   
hadd-e istâ

Fr.: limite stationnaire   

Same as → stationary limit.

static; → limit.

static pressure
  فشار ِ ایستا   
fešâr-e istâ

Fr.: pression statique   

In → fluid mechanics, the → pressure felt by an object suspended in a → fluid and moving with it. This pressure is called static because the object is not moving relative to the fluid. See also → dynamic pressure.

static; → pressure.

static Universe
  گیتی ِ ایستا   
giti-ye istâ

Fr.: Univers stationnaire   

A closed Universe of finite volume with a constant radius of curvature.

static; → Universe.

statics
  ایستاییک   
istâyik

Fr.: statique   

The branch of → mechanics which studies the laws of composition of forces and the conditions of equilibrium of material bodies under the action of forces.

static; → -ics.

Istâyik, from istâ, → static + -ik, → -ics.

station
  ایستگاه   
istgâh (#)

Fr.: station   

A stopping place for trains or other land vehicles, for the transfer of freight or passengers. → space station.

M.E., from O.Fr. station, from L. stationem (nominative statio) "a standing, job, position," related to stare "to stand," cognate with Pers. istâdan "to stand," as below.

Istgâh "standing place," from ist present stem of istâdan "to stand" (Mid.Pers. êstâtan; O.Pers./Av. sta- "to stand, stand still; set;" Av. hištaiti; cf. Skt. sthâ- "to stand;" Gk. histemi "put, place, weigh," stasis "a standing still;" L. stare "to stand;" Lith. statau "place;" Goth. standan; PIE base *sta- "to stand") + gâh "place; time" (Mid.Pers. gâh, gâs "time;" O.Pers. gāθu-; Av. gātav-, gātu- "place, throne, spot;" cf. Skt. gâtu- "going, motion; free space for moving; place of abode;" PIE *gwem- "to go, come").

stationary
  ایست‌ور   
istvar (#)

Fr.: stationnaire   

Having a fixed, unchanging position; motionless. geostationary orbit

M.E. from L. stationarius, in classical L., "of a military station," from statio, → station.

Isatvar, from ist present stem of istâdan "to stand" (Mid.Pers. êstâtan; O.Pers./Av. sta- "to stand, stand still; set;" Av. hištaiti; cf. Skt. sthâ- "to stand;" Gk. histemi "put, place, weigh," stasis "a standing still;" L. stare "to stand;" Lith. statau "place;" Goth. standan; PIE base *sta- "to stand") + -var suffix of possession, variant -ur (Mid.Pers. -uwar, -war; from O.Pers. -bara, from bar- "to bear, carry").

stationary black hole
  سیه‌چال ِ ایست‌ور   
siyah-câl-e istvar

Fr.: trou noir stationnaire   

A → black hole with zero → angular momentum, that does not rotate.

stationary; → black hole.

stationary limit surface
  رویه‌ی ِ حدّ ِ ایست‌ور   
ruye-ye hadd-e istvar

Fr.: surface limite stationnaire   

A property of → space-time outside a → rotating black hole, which consists of a surface which geometrically bounds the → ergosphere outward. At the stationary limit a particle would have to move with the local light velocity in order to appear stationary to a distant observer. This is because the space here is being dragged at exactly the speed of light relative to the rest of space. Outside this limit space is still dragged, but at a rate less than the speed of light. Also known as → static limit.

stationary; → limit; → surface.

stationary noise
  نوفه‌ی ِ ایست‌ور   
nufe-ye istvar

Fr.: bruit stationnaire   

Electronics: A random noise whose intensity remains constant with time.

stationary; → noise.

stationary orbit
  مدار ِ ایست‌ور   
madâr-e istvar

Fr.: orbite stationnaire   

An orbit in which the satellite revolves about the primary at the angular rate at which the primary rotates on its axis. From the primary, the satellite thus appears to be stationary over a point on the primary.

stationary; → orbit.

stationary phase
  فاز ِ ایست‌ور   
fâz-e istvar

Fr.: phase stationnaire   

Mechanics: The condition of a body or system at rest.

stationary; → phase.

stationary point
  نقطه‌ی ِ ایست‌ور   
noqte-ye istvar

Fr.: point critique, ~ stationnaire   

1) Math.: For a → function y = f(x), a point at which the → tangent to the graph is horizontal. In other words, a point where the → slope is zero: dy/dx = 0.
2) Of a planet, the position at which the rate of change of its apparent → right ascension is momentarily zero.

stationary; → point.

stationary satellite
  ماهواره‌ی ِ ایست‌ور   
mâhvâre-ye istvar

Fr.: satellite stationnaire   

An artificial satellite in a synchronous orbit. → geostationary orbit

stationary; → satellite.

stationary time series
  سری ِ زمانی ِ ایست‌ور   
seri-ye zamâni-ye istvar

Fr.: série temporelle stationnaire   

A → time series if it obeys the following criteria: 1) Constant → mean over time (t). 2) Constant → variance for all t, and 3) The → autocovariance function between Xt1 and Xt2 only depends on the interval t1 and t2.

stationary; → time; → series.

stationary wave
  موج ِ ایست‌ور   
mowj-e istvar

Fr.: onde stationnaire   

Same as → standing wave.

stationary; → wave.

statistical
  آماری   
âmâri (#)

Fr.: statistique   

Of, pertaining to, consisting of, or based on → statistics.

Statistic, from → statistics + → -al.

statistical equilibrium
  ترازمندی ِ آماری   
tarâzmandi-ye âmâri

Fr.: équilibre statistique   

A state in which the average density of atoms per cubic centimeter in any atomic state does not change with time and in which, statistically, energy is equally divided among all degrees of freedom if classical concepts prevail.

statistical; → equilibrium.

statistical hypothesis
  انگاره‌ی ِ آماری   
engâre-ye âmâri

Fr.: hypothèse statistique   

An assumed statement about the way a → random variable is distributed. A statistical hypothesis generally specifies the form of the → probability distribution or the values of the parameters of the distribution. The statement may be true or false. See also → null hypothesis.

statistical; → hypothesis.

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