Fr.: orbite géostationnaire
A satellite orbit in the plane of the Earth's equator and 35,880 km above it, at which distance the satellite's period of rotation matches the Earth's and the satellite always remains fixed in the same spot over the Earth.
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
Fr.: trou noir stationnaire
stationary limit surface
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.
Fr.: bruit stationnaire
Electronics: A random noise whose intensity remains constant with time.
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.
Fr.: phase stationnaire
Mechanics: The condition of a body or system at rest.
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.
Fr.: satellite stationnaire
An artificial satellite in a synchronous orbit. → geostationary orbit
stationary time series
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.
Fr.: onde stationnaire
Same as → standing wave.