Fr.: amortissement apériodique
A system in which the → damping is great enough to prevent oscillation.
Fr.: application bijective
Same as → bijection.
Gudegi from gudé, → clump, + -gi suffix forming noun from adjectives ending in -é.
The massing together of material to form clumps. → wind clumping.
Fr.: facteur de grumelage
Fr.: amortissement sans collision
Same as the → Landau damping.
Fr.: application conforme
A continuous mapping u = f(x) of a domain D in an n-dimensional Euclidean space (n≥ 2) into the n-dimensional Euclidean space is called conformal at a point x0∈ D if it has the properties of constancy of dilation and preservation of angles at this point.
Of an oscillating system, the progressive decrease with time in the amplitude of the oscillation, due to friction (internal or external) or other resistance.
M.E. damp "black damp, a poison gas occurring in a mine," from Mid.Du. or Mid. Low German; akin to O.H.G. damph "vapor."
Mirâyi, noun from mirâ "getting extinguished, going out, expiring, dying," from mordan, present tense stem mir- "to die," Mid.Pers. murdan "to die," O.Pers. mrt- "to die," amriyta "dies," martiya- "(mortal) man" (Mod.Pers. mard "man"), Av. mərəta- "died," Skt. mar- "to die," mrti- "death;" PIE base *mor-/*mr- "to die." Cognates in other IE languages: Gk. emorten "died," ambrotos "immortal," L. morior "I die," mortuus "dead" (Fr. mourir "to die," mort "dead"), Arm. merani- "to die," O.C.S. mrutvu "dead," O.Ir. marb, Welsh marw "died," O.E. morþ "murder," Lith. mirtis "man."
The addition of minute quantities of impurities to a semiconductor to achieve a desired characteristic.
Verbal noun of → dope.
Fr.: écoute éléctronique
The monitoring and/or examining the data that is passed over the network without sender and receiver's permission and/or knowledge. For example, a user on the Internet could eavesdrop on someone's phone conversation or e-mail.
Noun from → eavesdrop.
naqše bardâri-ye gerefti
Fr.: cartographie par éclipse
A method for imaging the continuum light distributions of the → accretion disks of → cataclysmic variable stars. It relies on geometrical information contained in eclipse light curves. An alternative method is → Doppler tomography.
Greisen-Zatsepin-Kuzmin limit (GZK)
Fr.: limite de Greisen-Zatsepin-Kuzmin
A theoretical limit of approximately 6 × 1019 → electron-volts for the energy of → cosmic rays above which they would lose energy in their interaction with the → cosmic microwave radiation background photons. Cosmic ray protons with these energies produce → pions on blackbody photons via the Δ resonance according to: γCMB + p → p + π0, or γCMB + p → n + π+, thereby losing a large fraction of their energy. These interactions would reduce the energy of the cosmic rays to below the GZK limit. Due to this phenomenon, → Ultra-high-energy cosmic rays are absorbed within about 50 Mpc.
Named after Kenneth Greisen (1966), Physical Review Letters 16, 748 and Georgiy Zatsepin & Vadim Kuzmin (1966), Journal of Experimental and Theoretical Physics Letters 4, 78; → limit.
The act or process of uniting into groups.
Verbal noun of → group.
Fr.: spin isobarique
Same as → isospin.
A quantum number based on the assumption that the nucleon (proton and neutron) is a single entity having two states, like → spin. It is conserved by the strong interaction. Same as isotopic spin, isobaric spin.
spin-e izotopi (#), izospin (#)
Fr.: spin isotopique
Same as → isospin.
Fr.: amortissement de Landau
The process wherein a → plasma gains energy at the expense of the → Langmuir wave. In the presence of the → Landau resonance, the particles in resonance moving slightly faster than the wave lose energy, while those moving slightly slower will gain energy. Since the Maxwellian distribution is decreasing with velocity, in a Maxwellian plasma, near the Landau resonance, there are more particles at lower velocities than at higher velocities. Also called collisionless damping.
1) naqšé bardâri; 2) hamtâyeš
Fr.: 1) cartographie; 2) application
1) The process of producing a map.
1) Naqšé bardâri;, → map.
Fr.: spin nucléaire
The total → angular momentum of a → nucleus, represented by symbol I. The nucleus, which is composed of neutrons and protons, acts as if it is a single entity which has intrinsic angular momentum. The nuclear spin depends on the → mass number; if the mass number is odd then the nucleus has half-integer spin like the electron while if the nucleus has even mass number then its spin will be integer spin.
Fr.: être d'avis que
To hold or express an opinion.
Verb for → opinion.