A usually metal instrument used to operate a lock's mechanism.
M.E. key(e), kay(e), O.E. cæg "key," of unknown origin,
Kelid, variants (Tabari) kali, (Lori) kelil, (Laki) kalil "key; lock," (Kurd) kilil, kolun "latch, bolt;" Mid.Pers. kilêl "key." See also → include.
surâx-e kelid (#)
Fr.: trou de serrure
1) The hole in which a key of a lock is inserted.
miq-e surâx-e kelid
Fr.: Nébuleuse du Trou de Serrure
A relatively small and dark cloud of molecules and dust seen silhouetted against the much brighter → Carina Nebula. It contains bright filaments of emitting hot gas and is roughly 7 → light-years in size.
Fr.: vecteur de Killing
Named after the German mathematician Wilhelm Killing (1847-1923); → vector.
A prefix meaning 103.
Introduced in France in 1795, when the → metric system was officially adopted, from Gk. khilioi "thousand," of unknown origin.
1) The basic unit of mass in the
→ International System of Units (SI)
and → MKS versions of the → metric system,
equal to 1,000 → grams. The kilogram is defined as the
mass of the standard kilogram, a platinum-iridium bar kept at the International Bureau of
Weights and Measures (BIPM), at Sèvre, near Paris, France. Copies of this bar are
kept by the standards agencies of all the major industrial nations.
A kilogram is very nearly equal to the mass of 1,000 cubic cm of water.
A unit of force equal to the force that produces an → acceleration of 9.80665 meters per second per second (m s-2) when acting on a mass of one kilogram.
A unit of → frequency, equal to 103 Hz.
A unit of length, equal to 1000 meters.,
A unit of energy equivalent to one kilowatt (1 kW) of power expended for one hour (1 h) of time. The kilowatt-hour is not a standard unit in any formal system, but it is commonly used to measure the consumption of electrical energy. To convert to → joules, use: 1 kWh = 3.6 × 106 J = 3.6 × 1013→ ergs.
Of or relating to → kinematics. Same as kinematical.
Fr.: biais cinématique
A systematic error introduced in a sample of stellar → proper motion data by higher velocity stars that are easier to measure.
Fr.: viscosité cinématique
The ratio of the → dynamic viscosity (η) to the density (ρ) of a fluid: ν = η/ρ. The unit of kinematic viscosity in the → SI system is m2s-1. In the → cgs system, cm2s-1, equal to 10-4 m2s-1, is called the → stokes (st).
kinematically decoupled core (KDC)
maqze-ye jonbešikâné vâjafsaridé
Fr.: cœur cinématiquement découplé
A central, tightly bound stellar subsystem observed in some elliptical galaxies which rotates in the opposite direction with respect to the main body of the → elliptical galaxy. Elliptical galaxies are thought to be the result of the → merger of two or more sizable galaxies. A plausible scenario for how counter-rotating cores could form in such a merger is as follows. If at least one of the galaxies has a core region that is fairly tightly bound by the galaxy's gravity, and the direction in which the two galaxies orbit each other before merging is opposite to the direction of rotation of stars in that tightly bound core, it is likely that, after the merger, the tightly bound core will end up as the core of the new, larger galaxy, while retaining its original sense of rotation. The surrounding stars, on the other hand, will rotate in a different way dictated by the orbital motion of the galaxies around each other, before the merger. While this is a plausible scenario, it can only explain some of the counter-rotating cores. Recently A. Tsatsi et al. (2015, ApJ 802, L3) have shown that although the two → progenitor galaxies are initially following a → prograde orbit, strong reactive forces during the merger can cause a short-lived change of their orbital spin; the two progenitors follow a → retrograde orbit right before their final coalescence. This results in a central kinematic decoupling and the formation of a large-scale (~2 kpc radius) counter-rotating core at the center of the final elliptical-like merger remnant, while its outer parts keep the rotation direction of the initial orbital spin.
The branch of mechanics dealing with the description of the motion of bodies or fluids without reference to the forces producing the motion.
From Gk. kinetikos "moving, putting in motion," from kinetos "moved," verbal adj. of kinein "to move;" PIE base *kei- "to move to and fro" (cf. Mod.Pers. šodan, šow- "to go; to become;" Av. šiyav-, š(ii)auu- "to move, go," šiyavati "goes," šyaoθna- "activity; action; doing, working;" O.Pers. šiyav- "to go forth, set," ašiyavam "I set forth;" Skt. cyu- "to move to and fro, shake about; to stir," cyávate "stirs himself, goes;" Goth. haitan "call, be called;" O.E. hatan "command, call").
Jonbešik, from jonbeš "motion" + -ik→ -ics. The first element from Mid.Pers. jumbidan, jumb- "to move," Lori, Laki jem "motion," related to gâm "step, pace;" O.Pers. gam- "to come; to go," Av. gam- "to come; to go," jamaiti "goes," gāman- "step, pace" (Mod.Pers. âmadan "to come"); Skt. gamati "goes;" Gk. bainein "to go, walk, step," L. venire "to come;" Tocharian A käm- "to come;" O.H.G. queman "to come;" E. come; PIE root *gwem- "to go, come."
Of or relating to motion; caused by motion; characterized by movement.
From Gk. kinetikos "moving, putting in motion," from kinein "to move," → kinematics.
Jonbeši, adj. of jonbeš, verbal noun of jonbidan, → move.
Fr.: énergie cinétique
The energy which a body possesses as a consequence of its motion, defined as one-half the product of its mass m and the square of its speed v, i.e. 1/2 mv2.
Fr.: hélicité cinétique
In fluid mechanics, a quantity that describes helical flow. It is defined by the integrated scalar product of the velocity field and the → vorticity: KK = ∫ dVu . (∇ x u). In the absence of magnetic field, this quantity is conserved by the → Euler equation. See also → magnetic helicity.