Fr.: synthèse additive
Color created by mixing light rays of different colors. Combining all the color rays of light results in white light. See also → subtractive color.
Fr.: identité additive
The number which can be added to any other number without changing the magnitude of that number: zero. → multiplicative identity.
additive law of probability
qânun-e bardâyeši-ye šavânâyi
Fr.: loi additive de probabilité
If E1, E2, ..., En are n → mutually exclusive events, then the probability of occurrence of at least one of them is the sum of their individual probabilities: P(E1 + E2 + ... + En) = P(E1) + P(E2) + ... + P(En).
Adhara (ε Canis Majoris)
A binary star, in the constellation → Canis Major, 470 → light-years distant from Earth. The main star possesses an apparent magnitude of +1.5 and belongs to the spectral classification B2 II. The +7.5 magnitude companion star is 7''.5 apart from the main star.
Adhara, from Ar. adhârâ "virgins," plural of adhrâ' "virgin".
Azârâ, from Ar. Adhara.
1) To stay attached; stick fast; cling.
From M.Fr. adhérer or directly from L. adhaerere "to stick to," from → ad- + haerere "to stick."
Âdusidan, from intensive/nuance prefix â- + dusidan (Dehxodâ) "to stick, to adhere," maybe related to Proto-Ir. *dauc- "to sew;" Pers. duxtan, duz- "to sew."
1) The act or state of adhering; adhesion.
1) A person who follows or upholds a leader, cause, etc.; supporter; follower.
From O.Fr. adherent or directly from L. adhaerentem pr.p. of adhaerere "to stick to," → adhere.
Âdusandé, from âdusidan, → adhere.
1) The act or state of adhering; state of being adhered or united.
1) Of or pertaining to the molecular force → adhesion.
Adjective from → adhere.
Fr.: force adhésive
The force of → attraction between molecules of different substances; for example, the force between the molecules of a solid and a liquid. When water is poured on clean glass, it tends to spread, forming a thin, uniform film over the surface. This is because the adhesive forces between water and glass are strong enough to pull the water molecules out of their spherical formation and hold them against the surface of the glass, thus avoiding the repulsion between like molecules.
From Ar. Al-dhayl "skirt of a garment; tail."
A → thermodynamic process that occurs without
→ loss or → gain of
From Gk. adiabatos "impassable," from a- "not" + diabatos "passable," from diabainein "to go across," from dia- " through" + bainein "to go."
Bidarrow from bi- "not; without" + darrow "way out," from dar "out" + row "to go, going," from raftan "to go."
degaršod-e bidarrow, degareš-e ~
Fr.: changement adiabatique
A change taking place in a system that has perfect thermal insulation, so that heat cannot enter or leave the system and energy can only be transferred by work.
Fr.: indice adiabatique
Of a gas, the ratio of its → specific heat at constant pressure to its specific heat at constant volume: γ = CP/ CV.
adiabatic initial conditions
butârhâ-ye âqâzin-e bidarrow
Fr.: conditions initiales adiabatiques
The assumption whereby the density fluctuations in the very → early Universe would be produced by compressing or decompressing of all components of a homogeneous Universe. The adiabatic initial conditions lead to coherent oscillations in the form of peaks in the → temperature anisotropy spectrum. See also → acoustic peak, → baryon acoustic oscillation.
Fr.: phase adiabatique
Same as the → Sedov-Taylor phase.
Fr.: processus adiabatique
→ adiabatic, → process.
Fr.: choc adiabatique
adiabatic temperature gradient
zine-ye damâ-ye bidarrow
Fr.: gradient de température adiabatique
The temperature gradient defining the → radiative equilibrium condition in a region. It is expressed as: dT/dr = (1 - 1/ γ)((T / P)(dP / dr), where T and P are temperature and pressure, dT / dr and dP / dr temperature and pressure gradients respectively, and γ = CP / CV. For radiative equilibrium to be stable against → convection, the actual temperature gradient must be less than the adiabatic temperature gradient, i.e. |dT /dr|rad < |dT /dr|ad. See also → Schwarzschild's criterion.
In grammar, a word that qualifies, describes, or quantifies a noun.
M.E., from O.Fr. adjectif, from L. adjectivum "that is added to (the noun)," neuter of adjectivus "added," from p.p. of adicere "to throw or place (a thing) near," from → ad- "to" + iacere "to throw," → jet.
Zâbé, from zâb "attribute, quality" (Dehxodâ); probably related to zib "beauty, adornment," zibâ "beautiful, adorned," zivar "ornament," zab "easy; gratis; right, direct;" from Proto-Ir. *zai- "to adorn, to equip."