# An Etymological Dictionary of Astronomy and AstrophysicsEnglish-French-Persian

## فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

### M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 17 Search : cohere
 cohere   همدوسیدن   hamdusidan (#)Fr.: adhérer, être cohérent   1) To stick together; be united; hold fast, as parts of the same mass. 2) Physics (of two or more similar substances) to be united within a body by the action of molecular forces (→ cohesion).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   همدوسی   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.→ cohere + -ence, → -ance. coherence area   پهنه‌ی ِ همدوسی   pahne-ye hamdusiFr.: zone de cohérence   Of an → electromagnetic wave, the area of a surface perpendicular to the direction of → propagation, over which the wave maintains a specified → degree of coherence. According to the van Cittert-Zernike theorem, the coherence area is given by: Ac = D2λ2/(πd2), where d is the diameter of the light source and D is the distance away. The coherence area is an important parameter in photon correlation experiments. In the → Young's experiment the → interference pattern is only seen if slits are inside one coherence area.→ coherence; → area. coherence length   درازا‌ی ِ همدوسی   derâzâ-ye hamdusiFr.: longueur de cohérence   The distance over which an → electromagnetic wave train maintains a specified → degree of coherence. The coherence length is related to the → coherence time multiplied by vacuum → velocity of light.→ coherence; → length. coherence time   زمان ِ همدوسی   zamân hamdusiFr.: 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.→ coherence; → time. coherent   همدوس   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   نور ِ همدوس   nur-e hamdus (#)Fr.: lumière cohérente   Light waves that have the same wavelength and possess a fixed phase relationship, as in a laser.→ coherent; → light. coherent optics   نوریک ِ همدوس   nurik-e hamdusFr.: optique cohérente   A branch of optics that uses coherent radiation to produce holographic three-dimensional images of objects.→ coherent; → optics. coherent scattering   پراکنش ِ همدوس   parâkaneš-e hamdusFr.: diffusion cohérente   A scattering process in which the scattered radiation bears the same frequency and phase as the incident radiation.→ coherent; → scattering. coherent source   خن ِ همدوس   xan-e hamdusFr.: 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.→ coherent; → source. degree of coherence   درجه‌ی ِ همدوسی   dareje-ye hamdusiFr.: degré de cohérence   The extent of → coherence of an → electromagnetic wave, as indicated by a → dimensionless number. Since interference takes place when waves are → coherent, using a → Young's experiment, the degree of coherence is measured from the → fringe  → visibility, V. It is defined as the ratio V = (Imax - Imin) / (Imax + Imin), where Imax is the intensity at a maximum of the → interference pattern, and Imin is the intensity at a minimum of the interference pattern. The electromagnetic wave is considered to be highly coherent when the degree of coherence is about 1, incoherent for nearly zero values, and partially coherent for values between 0 and 1.→ degree; → coherence. incoherent waves   موج‌های ِ ناهمدوس   mowjhâ-ye nâhamdus (#)Fr.: ondes incohérentes   The lack of a fixed phase relationship between two or more waves. → coherent.Incoherent, from negation prefix → in- + → coherent; → wave. non-coherent radiation   تابش ِ ناهمدوس   tâbeš-e nâhamdus (#)Fr.: rayonnement incohrént   Radiation having waves that are out of phase in space and/or time; radiation which is not → coherent.→ non-; → coherent; → radiation. noncoherent scattering   پراکنش ِ ناهمدوس   parâkaneš-e nâhamdusFr.: diffusion incohérente   The absorption of a photon and its re-emission at a different frequency (in the observer's frame of reference) by scattering atoms. quantum coherence   همدوسی ِ کو‌آنتومی   hamdusi-ye kuantomiFr.: cohérence quantique   In quantum physics, a situation where an object's wave property is split in two, and the two waves coherently interfere with each other in such a way as to form a single state that is a superposition of the two states. This phenomenon is based on the fact that atomic particles have wave-like properties. Quantum coherence is in many ways similar to → quantum entanglement, which involves the shared states of two quantum particles instead of two quantum waves of a single particle. Quantum coherence and quantum entanglement are both rooted in the → superposition principle.→ quantum; → coherence. spatial coherence   همدوسی ِ فضایی   hamdusi-ye fazâyiFr.: cohérence spatiale   In a wave train, a correlation between the phases of waves at points separated in space at a given time.→ spatial; → coherence. temporal coherence   همدوسی ِ زمانی   hamdusi-ye zamâniFr.: cohérence temporelle   A measure of the correlation between the phases of an → electromagnetic wave at different points along the direction of propagation. Temporal coherence indicates to what extent a source is monochromatic. Imagine a source emitting waves with wavelength λ ± Δλ. Waves with wavelength λ and λ + Δλ, which at some point in space constructively interfere, will no longer constructively interfere after some path length lc = λ2/(2πΔλ); lc is called the → coherence length.→ temporal; → coherence.