geostationary orbit madâr-e zamin-istvar 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. Geostationary, from → geo- + → stationary; → orbit. |
stationary 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 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 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 nufe-ye istvar Fr.: bruit stationnaire Electronics: A random noise whose intensity remains constant with time. → stationary; → noise. |
stationary orbit 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 fâz-e istvar Fr.: phase stationnaire Mechanics: The condition of a body or system at rest. → stationary; → phase. |
stationary point 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. → stationary; → point. |
stationary satellite mâhvâre-ye istvar Fr.: satellite stationnaire An artificial satellite in a synchronous orbit. → geostationary orbit → stationary; → satellite. |
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 X_{t1} and X_{t2} only depends on the interval t_{1} and t_{2}. → stationary; → time; → series. |
stationary wave mowj-e istvar Fr.: onde stationnaire Same as → standing wave. → stationary; → wave. |