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The soft, lustrous fiber obtained as a filament from the cocoon of the silkworm (Dictionary.com).
M.E., from O.E. seolc, sioluc, from L. sericum "silk garment, silk," from neuter of sericus "silken," from Gk. serikos, from Seres, an eastern Asian people, probably the Chinese (cf. Chinese si "silk", Manchurian sirghe, Mongolian sirkek).
Abrišam "silk," from Mid.Pers. abrešom "silk," ultimately from Proto-Ir. *au-uris-, from *uris- "to turn, spin;" cf. rešté "thread, line, file," reštan, ristan, "to spin;" Mid.Pers. 'rws- "to turn to;" Av. uruuaēs- "to twist, turn."
Fr.: amortissement de Silk
The smoothing of primordial → density fluctuations at high frequencies caused by photon → diffusion. Before the → decoupling era, photons and → baryons were tightly coupled to each other by → Compton scattering. However, the transition to a transparent → Universe was not instantaneous. As the → opacity of the Universe dropped, the photons started diffusing away from the positions they had while opaque, hence undergoing a → random walk. Since the → acoustic waves in the decoupling era were driven by photon pressure, the photon diffusion also led to damping of the → baryon acoustic oscillations. Silk damping suppresses all perturbations with masses smaller than about 1013 Msun. The implication for a theory of → structure formation is that individual galaxies must have formed in a → top-down structure formation mechanism, i.e. by the fragmentation of larger objects. However, in theories of structure formation which include → non-baryonic dark matter galaxies can form from smaller objects in a → bottom-up scenario.
Joseph Silk (1942-); → damping.
A metallic → chemical element;
symbol Ag (L. argentum). → Atomic number
47; → atomic weight 107.8682;
→ melting point 961.93°C;
→ boiling point 2,212°C;
→ specific gravity 10.5 at 20°C. Pure silver is
nearly white, lustrous, soft, very ductile, malleable, and an excellent
conductor of heat and electricity.
M.E. silver(e), selver(e), selfer;
O.E. seolfor "silver;" cf. O.S. silvbar, O.N. silfr,
M.Du. silver, Du. zilver, O.H.G. sillabar, Ger. silber,
Goth. silubr, akin to Serbo-Croatian srebro,
Rus. serebo, Lith. sidabras "silver."
Noqré from Sogdian nâkartak "uncoined (silver)," literally "undone," from nâ- negation prefix "not, no" (Mid.Pers. ne, O.Pers. naiy, Av. na-, (particle of negation noit), Skt. na-, (ned), Gk. né- "not," L. ne-, in-, un-, PIE *ne-) + kartak "done," p.p. of kardan "to do, to make;" kâr "work," variant kar (Mid.Pers. kardan; O.Pers./Av. kar- "to do, make, build;" Av. kərənaoiti "he makes;" cf. Skt. kr- "to do, to make," krnoti "he makes, he does," karoti "he makes, he does," karma "act, deed;" PIE base kwer- "to do, to make"), Sogdian nâktênê "of silver." Note that another word in Pers. for silver is sim, which has a semantic form comparable to that of noqré, since it derives from Mid.Pers. asêm, from Gk. asemon "without mark, uncoined, shapeless, formless," from argurion asemon "uncoined money."
A large on-line astronomical database, developed at the Centre de Données astronomiques de Strasbourg, → CDS in France. It provides a large collection of astronomical data, including cross-identifications, bibliography, and measurements for astronomical objects outside the solar system.
SIMBAD, short for Set of Identifications, Measurements, and Bibliography for Astronomical Data.
1) Geometry: Having the same shape; representing the same figure drawn to
different scales (same corresponding angles and proportional sides).
From Fr. similaire, from L. similis "like," → simulate.
mâtrishâ-ye hamânand (#)
Fr.: matrices similaires
Fr.: polygone similaires
Polygons that are exactly the same shape, but can be different sizes.
The state of being similar; likeness; resemblance.
Fr.: transformation de similarité
1) A transformation that preserves angles and changes all distances in the same ratio.
M.E., from O.Fr. simple, from L. simplus "simple, single," variant of simplex, from PIE root *sem- "one, together;" cf. Pers. ham "together," → com-, Skt. sam "together;" + *plac- "-fold," from PIE *plek- "to plait," → multiply.
Sâdé "simple, unmixed, smooth, erased, plain;" cf. Khotanese sāta- "smooth;" Baluchi sāt/sāy-, sāh- "to shave;" Av. si-, sā- "to sharpen, cut;" Skt. śā- "to sharpen, whet" (Cheung 2007); see also → precise.
Fr.: événement simple
Statistics: An event consisting of a single point of the → sample space.
Fr.: fraction simple
simple harmonic motion
jonbeš-e hamâhang-e sâdé
Fr.: mouvement harmonique
The motion of a body subjected to a restraining force which is directly proportional to the displacement from a fixed point in the line of motion. The equation of simple harmonic motion is given by x = A sin(ωt + θ0), where x is the body's displacement from equilibrium position, A is the → amplitude, or the magnitude of harmonic oscillations, ω is the → angular frequency, t is the time elapsed, and θ0 is the → initial phase angle.
simple harmonic oscillator
navešgar-e hamâhang-e sâdé
Fr.: oscillateur harmonique simple
Fr.: population simple
A set of stars resulting from a spatially (≤ few pc) and temporally (≤ Myr) correlated star formation event.
Fr.: racine simple
A generalization of the simplest closed configuration that can be made from straight line segments. For example, a → triangle is a 2-simplex because it is in two → dimensions, and → tetrahedron is a 3-simplex because it is in three dimensions (Steven Schwartzman, An Etymological Dictionary of Mathematical Terms Used in English, 1994).
Simplex, literally "uncomplicated, → simple," from sim-, from PIE root *sem- "one, once, together" + plek- "to fold." "folded [only] once."
Fr.: méthode du simplexe
An → algorithm for solving the classical → linear programming problem; developed by George B. Dantzig in 1947. The simplex method is an → iterative method, solving a system of → linear equations in each of its steps, and stopping when either the → optimum is reached, or the solution proves infeasible. The basic method remained pretty much the same over the years, though there were many refinements targeted at improving performance (e.g. using sparse matrix techniques), numerical accuracy and stability, as well as solving special classes of problems, such as mixed-integer programming (Free On-Line Dictionary of Computing, FOLDOC).
The act of simplifying, or the fact of being simplified.
Verbal noun of → simplify.
sâdé kardan (#)