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Fr.: Univers oscillatoire
A cosmological model in which the Universe is closed and undergoes a series of oscillations, each beginning with a big bang and ending with a big crunch.
The state of any quantity when the value of that quantity is continually changing so that it passes through maximum and minimum values.
Verbal noun of → oscillate.
tarz-e naveš, mod-e ~
Fr.: modes d'oscillation
Same as → pulsation mode.
A device for producing sonic or ultrasonic pressure waves in a medium. A device with no rotating parts for converting direct current into alternating current.
Agent noun of → oscillate.
Fr.: force d'oscillateur
A quantum-mechanical measure of the probability that a specific atomic transition will occur. It is used in the equation for the absorption coefficient of a spectral line. Also known as f value.
Geometry: Of a curve, to touch another curve so as to have the same tangent and curvature at the point of contact.
From L. osculatum p.p. of osculari "to kiss," from osculum "kiss," literally "little mouth," diminutive of os "mouth;" PIE *os-/*ous- "mouth;" cf. Av. āh- "mouth;" Skt. ās-, āsán- "mouth;" Hittite aiš- "mouth;" O.Ir. á "mouth;" O.N. oss "mouth."
Âbusidan, from â- a nuance prefix + busidan "to kiss," related to buyidan "to smell," buy "smell, scent;" Mid.Pers. bôy, bôd "smell, scent; consciousness," bôyidan "to smell," Mod./Mid.Pers. bustân "garden," Parthian (prefixed *pati-) pdbws- "to desire; to hope for;" Av. baod- "to perceive, notice, become aware of; to smell of," baoδi- "smell, fragrance," baozdri- "who gets to know sexually;" cf. Skt. bodh- "to wake, awaken; to perceive, pay attention," Buddha "awakened, enlightened;" Gk. peuthomai "to learn, hear;" Lith. budeti "to wake;" O.C.S. bljusti "to take care;" PIE base *bheudh- "to be aware, to make aware."
Relating to → osculate.
Participial adjective of → osculate.
Fr.: cercle osculateur
The circle that touches a curve (on the concave side) and whose radius is the radius of curvature.
Fr.: éléments orbitaux osculateurs
The orbital elements of an osculating orbit.
Fr.: orbite osculatrice
The Keplerian orbit that a satellite would follow after a specific time t if all forces other than central inverse-square forces ceased to act from time t on. An osculating orbit is tangent to the real, perturbed, orbit and has the same velocity at the point of tangency.
Fr.: plan osculateur
For a curve C at a point p, the limiting plane obtained from taking planes through the tangent to C at p and containing some variable point p' and then letting p' approach p along C.
sepehr-e âbusandé, kore-ye ~
Fr.: sphère osculatrice
For a curve C at a point p, the limiting sphere obtained by taking the sphere that passes through p and three other points on C and then letting these three points approach p independently along C.
The contact between two osculating curves or the like.
Verbal noun of → osculate
A → spacecraft whose goal is to collect a sample from the asteroid → 101955 Bennu and bring it back to Earth. It was launched by → NASA on September 8, 2016. OSIRIS-REx will spend two years chasing Bennu down, finally rendezvousing with the → near-Earth asteroid in August 2018. The spacecraft will then study the → asteroid Bennu from orbit for another two years before grabbing at least 60 grams of surface material in July 2020. The sample should reach Earth in 2023. The analysis of the sample would allow to study the role that → B-type asteroids like Bennu, which are primitive and apparently carbon-rich, may have played in helping life appear on Earth.
The name is short for Origins, Spectral Interpretation, Resource Identification, Security, Regolith Explorer .
A very hard, brittle metal belonging to the → platinum group elements; symbol Os. → Atomic number 76, → atomic weight 190.2, → melting point 3,045 °C, → boiling point 5,027 °C, → specific gravity 22.57 at 20°C. It was discovered in 1803 simultaneously with → iridium in a crude → platinum ore by the English chemist Smithson Tennant.
From Gk. osme "smell" because of the sharp odor of the volatile oxide.
The process by which solvent molecules pass through a partially permeable membrane from a dilute solution into a more concentrated solution, thus equalizing the concentrations of materials on either side of the membrane. → permeability.
Extracted from Fr. endosmose "endosmosis" and exosmose "exosmosis," from Gk. prefixed osmos "a thrusting, a pushing," from othein "to push, to thrust;" cf. Av. vādāiiôit "breaks through, hunts," vadah- "wedge;" Mod.Pers. guvah, gavah "wedge;" Skt. vadh- "to slay, kill," vadha- "killer."
Tarârân, literally "pushing across," from tarâ-, → trans-, + rân present stem of rândan "to push, drive, cause to go," causative of raftan "to go, walk, proceed" (present tense stem row-, Mid.Pers. raftan, raw-, Proto-Iranian *rab/f- "to go; to attack").
Fr.: pression osmotique
The hydrostatic pressure produced on the surface of a partially permeable membrane by osmosis.
Fr.: critère d'Ostriker-Peebles
An approximate empirical criterion for the stability of a → galactic disk against its collapse to form a bar. The disk is stable if the following relation holds: T/|W| < 0.14, where T is the rotational → kinetic energy and |W| is the absolute value of the gravitational → potential energy. While the → Toomre criterion applies only to small linear perturbations, the Ostriker-Peebles criterion describes global modes.
Ostriker & Peebles, 1973, ApJ 186, 467; → criterion.
1) digar (#); 2) nâxodi kardan, digaridan
1a) Being the one (as of two or more) remaining or not included.
M.E., from O.E. ôther; related to O.Saxon athar, O.Norse annarr, Du. ander, O.H.G. andar, Ger. ander, ultimately from PIE *an-tero- (cf. Lith. antras, O.Prussian anters.
Digar "another, other," from Mid.Pers. dit, ditikar "the other, the second," O.Pers. duvitiya- "second," Av. daibitya-, bitya- "second," Skt. dvitiya- "second," PIE *duitiio- "second."