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gelding axté (#) Fr.: hongre, castré, castration A castrated male animal, especially a horse. |
Geminga Geminga Fr.: Geminga A bright → gamma-ray source discovered in 1973 in the constellation → Gemini with instruments aboard NASA's first γ-ray satellite SAS-2. It was known only as a γ-ray source until it was detected in X-rays by the Einstein Observatory and associated with an optical counterpart of apparent magnitude 25. Because its luminosity outside of the γ-ray region is extremely low, the nature of this object remained a mystery until the discovery of pulsed emission, by the → ROSAT satellite in 1992, showed that it is a → pulsar. The pulsar period (~237 milliseconds) and its → period derivative (~1.1 × 10^{-14} s s^{-1}) correspond to a → spin-down age of ~340,000 years. Also called PSR J0633+1746 (see Bignami & Caraveo 1996, ARA&A 34, 331 for a review). An abbreviation for the Gemini gamma ray source. More amusingly, Geminga has been related to the Italian dialectal ghè minga spoken by the involved astronomers. This, in Milanese, means "it's not there," referring to the fact that the source could not be detected in the radio frequencies, one of the ongoing enigmas. |
Gemini dopeykar (#) Fr.: Gémeaux The Twins. A prominent constellation of the northern hemisphere and the third (and northernmost) of the → Zodiac. It lies south and east of → Auriga, west of → Cancer, and north and east of → Orion, at 7h right ascension and +22° declination. Its brightest stars are → Castor and → Pollux. Abbreviation: Gem; genitive: Geminorum. Gemini, from M.E., from L. gemini, plural of geminus "twin; double;" cf. Av. yəma- "twin;" Skt. yamá-, yamala- "twin, paired;" Persian dialects Kermâni jomoli "twin," Qâyeni jamal "twin," Tabari da-cembali "twin;" PIE base *iem- "to hold." Dopeykar, from do "two" (Mid.Pers. do, Av. dva-; Skt. dvi-; Gk. duo; L. duo ( Fr. deux); E. two; Ger. zwei) + peykar "figure, form, body" (from Mid.Pers. pahikar "picture, image;" from O.Pers. patikara- "picture, (sculpted) likeness," from patiy "against" (Av. paiti; Skt. prati; Gk. poti/proti) + kara- "doer, maker," from kar- "to do, make, build;" Av. kar-; Skr. kr-; cf. Skt. pratikrti- "an image, likeness, model; counterpart"). |
Geminids dopeykariyân (#) Fr.: Géminides A → meteor shower that occurs in the first half of December, with its → radiant in the → constellation → Gemini. Geminids are pieces of debris from the extinct comet → 3200 Phaethon. The shower appears when Earth runs into a stream of the debris every year in mid-December, causing → meteors to fly from that constellation. |
Gemma Alfakké (#) Fr.: Alphekka The brightest star in the constellation → Corona Borealis. Same as → Alphekka. Gemma, from L. gemma "precious stone, jewel," originally "bud," from the root *gen- "to produce", → generate. Alfakké, → Alphekka. |
gender žâné Fr.: genre In some languages (not in English, nor in Persian) a set of two or more grammatical categories (called → masculine, → feminine, and → neuter) into which nouns, pronouns, and adjectives are divided. For example, French, Spanish, and Italian have two genders, masculine and feminine (shown, for example, in French by the use of le and la, respectively); German and Russian have three genders, masculine, feminine, and neuter. Ancient Iranian languages had three genders, like Sanskrit and Greek. From M.E. gendre, from O.Fr. gendre, from stem of L. genus "race, stock, family; kind, rank, order; species." Žâné "race, species," ultimately from Proto-Ir. *zan- "to be born," cf. Av. za(n)- "to give birth; to be born;" related to Pers. zâdan, akin to L. genus, as above, → generate; the transformation of z into ž, as in nežâd, → race. |
gene žen (#) Fr.: gène The basic unit of hereditary that is an ordered sequence of nucleotides located in a particular position of a particular chromosome. It is the means by which characteristics are transmitted from parents to offsprings. From Ger. Gen, coined 1905 by Danish scientist Wilhelm Ludvig Johannsen (1857-1927), from Gk. genos "race, kind," genesis "origin," genea "generation, race;" cognate with L. genus "race, stock;" generare "to bring forth;" Pers. zâdan "to bring forth;" → generate. Žen, loanword from Fr., as above. |
general harvin Fr.: général (Adj.) 1) Not limited to one class, field, product, service, etc.
2) Relating to the whole or to the all or most.
3) Dealing with overall characteristics, universal aspects, or important elements. From L. generalis "relating to all, of a whole class," from genus "race, stock, kind," akin to Pers. zâdan, Av. zan- "to bear, give birth to a child, be born," infinitive zazāite, zāta- "born;" Mod.Pers. zâdan, present stem zā- "to bring forth, give birth" (Mid.Pers. zâtan; cf. Skt. jan- "to produce, create; to be born," janati "begets, bears;" Gk. gignomai "to happen, become, be born;" L. gignere "to beget;" PIE base *gen- "to give birth, beget." Harvin, from Mid.Pers. harvin "all," from har(v) "all, each, every" (Mod.Pers. har "every, all, each, any"); O.Pers. haruva- "whole, all together;" Av. hauruua- "whole, at all, undamaged;" cf. Skt. sárva- "whole, all, every, undivided;" Gk. holos "whole, complete;" L. salvus "whole, safe, healthy," sollus "whole, entire, unbroken;" PIE base *sol- "whole." |
general precession pišâyân-e harvin Fr.: précession générale The secular motions of the → celestial equator and → ecliptic. In other words, the sum of → lunisolar precession, → planetary precession, and → geodesic precession. → general; → precession |
general precession in longitude pišâyân-e harvin-e derežnâ Fr.: précession générale en longitude The secular displacement of the → equinox on the → ecliptic of date. → general; → precession; → longitude. |
general precession in right ascension pišâyân-e harvin-e râst afrâz Fr.: précession générale en ascension droite The secular motion of the → equinox along the → celestial equator. → general; → precession; → right ascension. |
general relativistic bâzânigimand-e harvin Fr.: de relativité générale Of, relating to, or subject to the theory of → general relativity. → general; → relativistic. |
general relativity bâzânigi-ye harvin Fr.: relativité générale The theory of → gravitation developed by Albert Einstein (1916) that describes the gravitation as the → space-time curvature caused by the presence of matter or energy. Mass creates a → gravitational field which distorts the space and changes the flow of time. In other words, mass causes a deviation of the → metric of space-time continuum from that of the "flat" space-time structure described by the → Euclidean geometry and treated in → special relativity. General relativity developed from the → principle of equivalence between gravitational and inertial forces. According to general relativity, photons follow a curved path in a gravitational field. This prediction was confirmed by the measurements of star positions near the solar limb during the total eclipse of 1919. The same effect is seen in the delay of radio signals coming from distant space probes when grazing the Sun's surface. Moreover, the space curvature caused by the Sun makes the → perihelion of Mercury's orbit advance by 43'' per century more than that predicted by Newton's theory of gravitation. The → perihelion advance can reach several degrees per year for → binary pulsar orbits. Another effect predicted by general relativity is the → gravitational reddening. This effect is verified in the → redshift of spectral lines in the solar spectrum and, even more obviously, in → white dwarfs. Other predictions of the theory include → gravitational lensing, → gravitational waves, and the invariance of Newton's → gravitational constant. → general; → relativity. |
general secretary harvin dabir Fr.: secrétaire général |
generalization harvinkard, harvineš Fr.: généralisation The act or process of generalizing; → generalize. Verbal noun of → generalize. |
generalize harvin kardan, harvinidan Fr.: généraliser To make general, to include under a general term; to reduce to a general form. |
generalized harvinidé Fr.: généralisé Made general. → generalized coordinates; → generalized velocities. P.p. of → generalize |
generalized coordinates hamârâhâ-ye harvinidé Fr.: coordonnées généralisées In a material system, the independent parameters which completely specify the configuration of the system, i.e. the position of its particles with respect to the frame of reference. Usually each coordinate is designated by the letter q with a numerical subscript. A set of generalized coordinates would be written as q_{1}, q_{2}, ..., q_{n}. Thus a particle moving in a plane may be described by two coordinates q_{1}, q_{2}, which may in special cases be the → Cartesian coordinates x, y, or the → polar coordinates r, θ, or any other suitable pair of coordinates. A particle moving in a space is located by three coordinates, which may be Cartesian coordinates x, y, z, or → spherical coordinates r, θ, φ, or in general q_{1}, q_{2}, q_{3}. The generalized coordinates are normally a "minimal set" of coordinates. For example, in Cartesian coordinates the simple pendulum requires two coordinates (x and y), but in polar coordinates only one coordinate (θ) is required. So θ is the appropriate generalized coordinate for the pendulum problem. → generalized; → coordinate. |
generalized forces niruhâ-ye harvinidé Fr.: forces généralisées In → Lagrangian dynamics, forces related to → generalized coordinates. For any system with n generalized coordinates q_{i} (i = 1, ..., n), generalized forces are expressed by F_{i} = ∂L/∂q_{i}, where L is the → Lagrangian function. → generalized; → force. |
generalized momenta jonbâkhâ-ye harvinidé Fr.: quantité de mouvement généralisée In → Lagrangian dynamics, momenta related to → generalized coordinates. For any system with n generalized coordinates q_{i} (i = 1, ..., n), generalized momenta are expressed by p_{i} = ∂L/∂q^{.}_{i}, where L is the → Lagrangian function. → generalized; → momentum. |
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