An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 33 Search : unit
SI units
  یکاهای ِ SI   
yekâhâ-ye SI

Fr.: Système International   

A coherent and rationalized system of units, in common use in physics since 1969. The seven basic units are the → meter, the → kilogram, the → second, the → ampere, the → kelvin, the → mole, and the → candela. Same as international system of units.

SI, from Fr. Système Internationale d'unités; → unit.

solar neutrino unit (SNU)
  یکای ِ نوترینوهای ِ خورشیدی   
yekâ-ye notrinohâ-ye xoršidi

Fr.: unité de neutrinos solaires   

A measure of the flux of neutrinos from the Sun reaching the Earth. 1 SNU is equal to 10-36 solar neutrinos captured per target atom per second.

solar; → neutrino; → unit.

unit
  یکا، یکان   
yekâ (#), yekân (#)

Fr.: unité   

A quantity or dimension adopted as a standard of measurement.
Math.: The lowest positive natural number.
The first digit to the left of the decimal point in decimal notation, representing a whole number less than ten.
An element in a ring that has a multiplicative inverse.

Back formation from → unity.

Yekâ, yekân, from yek, → one.

unit vector
  بردار ِ یکا   
bordâr-e yekâ

Fr.: vecteur unité   

A vector of length 1, also called a direction vector.

unit; → vector.

unitarity
  یکاییگی   
yekâyigi

Fr.: unitarité   

1) The condition of being → unitary.
2) → quantum unitarity.

unitary; → -ity.

unitary
  یکایی   
yekâyi

Fr.: unitaire   

1) Of or pertaining to a unit or units; having the indivisible character of a unit.
2) Math.: An → operator  U satisfying the relations: U+ U = 1, U U+ = 1, where U+ is the → adjoint .

unit + -ary.

unitary group
  گروه ِ یکایی، ~ یکانی   
goruh-e yekâyi, ~ yekâni

Fr.: groupe unitaire   

The set of n × n unitary matrices (→ unitary matrix).

unitary; → group.

unitary matrix
  ماتریس ِ یکایی، ~ یکانی   
mâtris-e yekâyi, ~ yekâni

Fr.: matrice unitaire   

A square matrix whose inverse equals its adjoint.

unitary; → matrix.

unitary operator
  آپارگر ِ یکایی   
âpârgar-e yekâyi

Fr.: opérateur unitaire   

A linear operator whose inverse is its → adjoint. In addition to → Hermitian operators, unitary operators constitute a fundamentally important class of quantum-mechanical operators.

unitary; → operator.

unitary transformation
  ترادیس ِ یکایی، ~ یکانی   
tarâdis-e yekâyi, ~ yekâni

Fr.: transformation unitaire   

A transformation whose reciprocal is equal to its Hermitian conjugate.

unitary; → transformation.

unite
  آیکیدن، هم‌یکیدن   
âyekidan, ham-yekidan

Fr.: unir   

To join, combine, or incorporate so as to form a single whole or unit.

M.E. uniten, from L. unitus, p.p. of unire "to unite," from unus, → one.

Âyekidan, from â- nuance/strengthening prefix + yek, → one, + -idan infinitive suffix; ham-yekidan, from ham- "together," → syn-, + yekidan.

united
  آیکیده، هم‌یکیده   
âyekidé, ham-yekidé

Fr.: uni   

Formed by or resulting from the union of two or more persons or things.

P.p. of → unite.

unity
  یکی   
yeki (#)

Fr.: unité   

The state or condition of being one.
Math.: One.

M.E. unite, from O.Fr., from L. unitatem "oneness, sameness, agreement," from unus, → one.

Yeki, noun from yek, → one.

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