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coefficient hamgar (#) Fr.: coefficient 1) Math.: A number or letter placed before an
algebraic expression to indicate that the expression is to
be multiplied by that factor, e.g. in the expression 2 x^{3},
2 is the coefficient of x^{3}. In general, any factor of
a product is called the coefficient of the product of the remaining
factors. Hamgar, from ham- "together," → com- + -gar agent suffix, from kar-, kardan "to do, to make," Mid.Pers. kardan, O.Pers./Av. kar- "to do, make, build," Av. kərənaoiti "makes," cf. Skt. kr- "to do, to make," krnoti "makes," karma "act, deed;" PIE base k^{w}er- "to do, to make." |
coefficient of viscosity hamgar-e vošksâni Fr.: coefficient de viscosité A quantity that indicates a property of fluids and is defined by the ratio of shearing → stress to the rate of change of shearing → strain. It is also simply called viscosity. The coefficient of viscosity is expressed by: μ = (F/A) / (dv/dy), where F is the force required to maintain a steady velocity difference dv between any two parallel layers of the fluid, A is the area of the layers, and dv/dy is the → velocity gradient between two points separated by a small distance measured at right angles to the direction of flow. The unit of viscosity is that of force times distance divided by area times velocity. Thus, in the cgs system, the unit is 1 dyne.cm/cm^{2}.(cm/s), which reduces to 1 dyne.s/cm^{2}. This unit is called 1 → poise. → viscosity; → coefficient. |
coelostat âsmândâštâr Fr.: coelestat A flat mirror with a clock-drive mounted in such a way that it moves from east to west to compensate for the apparent rotation of the Earth in order that the image of a particular area of sky remains fixed in the focal plane. See also → siderostat and → heliostat. Coelostat, from L. coelo-, for caeli-, combination form of coelum "sky" + -stat prefix denoting something that stabilizes, keeps, fixes, from -stata, from Gk. -states "one that causes to stand," or statos "standing," from *sta- "to stand." Âsmândâštâr, from âsmân, → sky, + dâštâr "holder, maintainer," from dâštan "to hold, maintain; to have; to possess," Mid.Pers. dâštan, O.Pers./Av. root dar- "to hold, keep back, maitain, keep in mind," Skt. dhr-, dharma- "law," Gk. thronos "elevated seat, throne," L. firmus "firm, stable," Lith. daryti "to make," PIE *dher- "to hold, support." |
coeval hamsenn (#) Fr.: du même âge, contemporain Of the same age. |
cofactor hamkarvand Fr.: cofacteur A number associated with an → element of a → determinant. If A is a square matrix [a_{ij}], the cofactor of the element a_{ij} is equal to (-1)^{i+j} times the determinant of the matrix obtained by deleting the i-th row and j-th column of A. |
cognition šenâxtâr (#) Fr.: connaissance, cognition 1) The mental process of knowing, including → awareness,
→ perception, → reasoning,
and judgment. M.E. cognicioun; L. cognitionem (nominative cognitio, from cognitus p.p. of cognoscere, from → co- + gnoscere, noscere "to learn;" cognate with Pers. šenâs, šenâxt, as below. Šenâxtâr, verbal noun of šenâxtan "to know, recognize," dânestan "to know;" O.Pers./Av. xšnā- "to know, learn, come to know, recognize;" cf. Skt. jñā- "to recognize, know," jānāti "he knows;" Gk. gignoskein "to know, think, judge;" L. gnoscere, noscere "to come to know" (Fr. connaître; Sp. conocer); O.E. cnawan; E. know; Rus. znat "to know;" PIE base *gno- "to know." |
cognitive šenâxtâri (#) Fr.: cognitif 1) Of or pertaining to the act or process of knowing, perceiving, remembering, etc.;
of or relating to → cognition. |
cohere hamdusidan (#) Fr.: adhérer, être cohérent 1) To stick together; be united; hold fast, as parts of the same mass. From L. cohaerere "to cleave together," from → com- "together," + haerere "to stick." Hamdusidan, from ham- "together," → com-, + dusidan (Dehxodâ) "to stick, to adhere," → adhere. |
coherence hamdusi (#) Fr.: cohérence The property of two or more electromagnetic waves when they are in fixed phase relationship over time. If the crests and troughs of the waves meet at the same time and place they are said to be in phase. |
coherence area pahne-ye hamdusi Fr.: zone de cohérence Of an electromagnetic wave, the area of a surface perpendicular to the direction of propagation, over which the electromagnetic wave maintains a specified degree of coherence. |
coherence length derâzâ-ye hamdusi Fr.: longueur de cohérence The distance over which an electromagnetic wave train maintains a specified degree of coherence. |
coherence time zamân hamdusi Fr.: temps de cohérence The time over which a propagating electromagnetic wave may be considered coherent. The coherence time of an interferometer is the interval during which the fringe phase remains stable. |
coherent hamdus (#) Fr.: cohérent Two or more wave sources are said to be coherent sources if the phase difference between a pair of points, one in each source, remains constant. Coherent, adj., → coherence. |
coherent light nur-e hamdus (#) Fr.: lumière cohérente Light waves that have the same wavelength and possess a fixed phase relationship, as in a laser. |
coherent optics nurik-e hamdus Fr.: optique cohérente A branch of optics that uses coherent radiation to produce holographic three-dimensional images of objects. |
coherent scattering parâkaneš-e hamdus Fr.: diffusion cohérente A scattering process in which the scattered radiation bears the same frequency and phase as the incident radiation. → coherent; → scattering. |
coherent source xan-e hamdus Fr.: source cohérente One of two light beams derived from the same source in → interference experiments. It is impossible to obtain interference from two separate sources because their → wavefronts do not have a constant → phase difference. In → Young's experiment, → Fresnel's biprism, → Fresnel's mirrors, and → Lloyd's mirror the two sources always have a point-to-point correspondence of phase, since they are both derived from the same source. |
cohesion hamduseš (#) Fr.: cohésion Holding together. From L. cohæsus, p.p. of cohærere "to stick together," → coherence. Hamduseš, verbal noun from hamdusidan "to cohere," → coherence. |
cohesive hamdusandé, hamduseši Fr.: cohésif 1) Of or pertaining to the molecular force → cohesion. Adjective from → cohere. |
cohesive energy kâruž-e hamduseš Fr.: énergie de cohésion The energy associated with the chemical bonding of atoms in a solid. |
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