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cosmic star formation peak cakâd-e keyhâni-ye diseš-e setâregân Fr.: pic de formation stellaire cosmique A crucial period in the history of the → Universe, when the bulk of stars in massive galaxies were likely formed. Observations of young stars in distant galaxies at different times in the past have indicated that the → star formation rate peaked at the → redshift of z ~ 2, some 10 billion years ago, before declining by a factor of around ten to its present value (P. Madau & Dickinson, 2014, arXiv:1403.0007). |
deform 1) vâdisidan; 2) vâdisândan Fr.: 1) se déformer; 2) déformer 1) To undergo → deformation. From O.Fr. déformer, from L. deformare "to disfigure," from → de- + → form. Vâdisidan, vâdisândan infinitive from vâdis, from vâ-, → de-, + dis, → form. |
deformable vâdisidani Fr.: déformable Capable of being → deformed. → deformable mirror |
deformable mirror âyene-ye vâdisidani Fr.: miroir déformable A very thin mirror whose shape can be changed by the force applied by many small pistons behind the mirror. Such a mirror is used in the → adaptive optics technique to correct the → wavefront affected by the → atmospheric turbulence. See also → tip-tilt mirror. → deformable; → mirror. |
deformation vâdis, vâdiseš, vâdisâneš Fr.: déformation Altering in the size or shape of a body. See also → deformable. Verbal noun of → deform. |
deformed vâdisidé Fr.: déformé Past participle of → deform. |
Descartes' formula disul-e Descartes Fr.: formule de Descartes A formula that gives the position of an image formed by highly → paraxial rays from a → spherical mirror. It is quite accurately given by: 1/x_{o} + 1/x_{i} = 2/x_{C}, where x_{o} is the distance along the → principal axis from the mirror to the object, x_{i} is the distance from mirror to image, and x_{C} is the distance from the mirror to its center of curvature. Any distance measured on the same side of the mirror as the reflecting surface is positive; on the other side, negative. Thus for a → concave mirror x_{C} is positive; for a → convex mirror, negative. |
dimensional formula disul-e vâmuni Fr.: formule dimensionnelle Symbolic representation of the definition of a physical quantity obtained from its units of measurement. For example, with M = mass, L = length, T = time, area = L^{2}, velocity = LT^{-1}, energy = ML^{2}T^{-2}. → dimensional analysis. → dimensional; → formula. |
elastic deformation vâdiseš-e kešâyand Fr.: déformation élastique A deformation of a → solid body in which the change (→ strain) in the relative position of points in the body disappears when the deforming stress is removed. See also → elastic limit. → elastic; → deformation. |
empirical formula disul-e ârvini Fr.: formule empirique 1) In physics, a mathematical equation that predicts observed results, but has
no known theoretical basis to explain why it works. |
Euler's formula disul-e Euler Fr.: formule d'Euler A formula which expresses an → exponential function
with an → imaginary number
→ exponent in terms of
→ trigonometric functions: |
form 1) dis, disé (#); 2) disidan (#); 3) disândan (#) Fr.: 1) forme; 2) se former; 3) former 1) (n.) General: The shape and structure of something as distinguished
from its material. From O.Fr. forme, from L. forma "form, mold, shape, case," origin unknown. 1)
Dis, disé "form, appearance," variants -diz, -diš (tandis
"body form, like a body; effigy;" mâhdis "moon-like;"
šabdiz "night color; a horse of
dark rusty color;" andiš- "to think, contemplate"), from Mid.Pers.
dêsag "form, appearance," dêsidan
"to form, build;" Av. daēs- "to show," daēsa- "sign, omen;"
cf. Skt. deś-
"to show, point out;" PIE *deik- "to show" (cf. Gk. deiknumi "to show,"
dike "manner, custom;" L. dicere "to utter, say;" O.H.G. zeigon,
Ger. zeigen "to show;" O.E. teon "to accuse," tæcan "to teach"). |
formal diseyi, disevar Fr.: formel 1) According to, or following established or prescribed forms, conventions, etc. M.E. formal, formel, from L. formalis, from → form + → -al. Diseyi, desevar, from dis, → form, + adj. suffixes -i and -var. |
formal language zabân-e disevar Fr.: langage formel A language designed for use in situations in which natural language is unsuitable, as for example in → mathematics, → logic, or → computer → programming. The symbols and formulas of such languages stand in precisely specified syntactic and semantic relations to one another (Dictionary.com). |
formal logic guyik-e diseyi, ~ disevar Fr.: logique formelle The traditional or → classical logic in which the → validity or → invalidity of a conclusion is deduced from two or more statements (→ premises). Based on Aristotle's (384-322 BC) theory of → syllogism, systematized in his book "Organon," its focus is not on what is stated (the content) but on the structure (form) of the → argument and the validity of the inference drawn from the premises of the argument; if the premises are true then the logical consequence must also be true. Formal logic is → bivalent, that is it recognizes only two → truth values: → true and → false. The basic principles of formal logic are: 1) → principle of identity, 2) → principle of excluded middle, and 3) → principle of non-contradiction. See also → symbolic logic, → fuzzy logic. |
formal system râžmân-e diseyi, ~ disevar Fr.: système formel In logic and mathematics, a system in which statements can be constructed and manipulated with logical rules. |
formaldehyde (H2CO) formâldehid Fr.: formaldehyde A colorless gas with a pungent, suffocating odor used as an adhering component of
glues in many wood products. Formaldehyde (H_{2}CO)
is obtained most commonly by the oxidation of methanol or petroleum gases such as
methane, ethane, etc. From form(ic) acid, from Fr. formique, + → aldehyde. |
formalism disegerâyi Fr.: formalisme 1) Excessive adherence to prescribed forms. |
formality disevari Fr.: formalité 1) Condition or quality of being formal; accordance with required or
traditional rules, procedures, etc. |
formalization disevareš Fr.: formalisation 1) The act of giving something a form or structure by introducing rules
and procedures. |
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