An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 20 Search : conduct
conduct
  هاختن، هازیدن   
hâxtan, hâzidan

Fr.: conduire   

(v.tr.) To direct the course of; to lead or guide. To serve as a medium for conveying; transmit.
(v.intr.) To act as a conductor.

From L. conductus, p.p. of conducere "to lead or bring together," from → com- "together" + ducere "to lead."

Hâxtan, hâzidan, from Mid.Pers. "to lead, guide, persuade," Av. hak-, hacaiti "to attach oneself to, to join," cf. Skt. sacate "accompanies, follows," Gk. hepesthai "to follow,", L. sequi "to follow;" PIE *sekw-.

conductance
  هازایی   
hâzâyi

Fr.: conductance   

The ability of a system to conduct electricity, calculated as the ratio of the current which flows to the potential difference present. This is the reciprocal of the → resistance, and is measured in → siemens or → mhos.

conduct + → -ance.

conduction
  هازش   
hâzeš

Fr.: conduction   

The transference of energy through a body, without visible motion of any part of the body. → induction; → reduction; → subduction; → transduction.

Verbal noun from → conduct.

conduction electron
  الکترون ِ هازش   
elektron-e hâzeš

Fr.: électron de conduction   

An electron whose energy lies in the conduction band of a solid, where it is free to move under the influence of an electron field.

conduction; → electron.

conduction band
  باند ِ هازش   
bând-e hâzeš

Fr.: bande de conduction   

In the energy spectrum of a solid, a range of energies in which electrons can move freely under the influence of an electrical field. Metals have many electrons in this range, insulators have none. In semiconductors the conduction band contains few electrons provided by impurity atoms or ejected from the valence bands by thermal energy or photon absorption.

conduction; → bande.

conductive
  هازنده   
hâzandé

Fr.: conducteur   

(Adj.) Having the property or capability of conducting.

From → conduct + -ive a suffix of adj.

conductivity
  هازندگی   
hâzandegi

Fr.: conductivité   

1) General: A measure of the ability to transmit, as electricity, thermal energy, sound, and so on.
2) → electrical conductivity.
3) → thermal conductivity.

From → conductive + → -ity suffix forming abstract nouns expressing state or condition.

conductor
  هازنده   
hâzandé

Fr.: conducteur   

Substance, or body, which offers a relatively small resistance to the passage of an electric current.

Agent noun from conduce, → conduct, + → -tor.

electrical conductivity
  هازندگی ِ برقی   
hâznadegi-e barqi

Fr.: conductivité électrique   

A measure of a material's ability to conduct an electrical current. It is the reciprocal of the → resistivity. Conductivity is expressed by σ = ne2l/(2mv), where n is the number of electrons per cm3 volume of the → conductor, e is the → electron charge, l is the → mean free path, m is the → electron mass, and v is the arithmetic mean velocity of thermal motion of electrons at a given temperature.

electrical; → conductivity.

extrinsic photoconductivity
  شیدهازندگی ِ برونگین   
šidhâzandegi-ye borungin

Fr.: photoconductivité extrinsèque   

Photoconductivity due to the addition of impurities or external causes.

extrinsic; → photoconductivity.

Šidhâzandegi, → photoconductivity; borungin, → extrinsic.

extrinsic semiconductor
  نیم‌هازا‌ی ِ برونگین   
nimhâzâ-ye borungin

Fr.: semiconducteur extrinsèque   

A semiconductor, such as silicon, whose responsive properties can be altered by the addition of impurities. Copper- and mercury-doped germanium are both examples of this semiconductor material.

extrinsic; → semiconductor.

heat conduction
  هازش ِ گرما   
hâzeš-e garmâ

Fr.: conduction de chaleur   

A type of → heat transfer by means of molecular agitation within a material without any motion of the material as a whole.

heat; → conduction.

intrinsic semiconductor
  نیم‌هازا‌ی ِ درونگین   
nimhâzâ-ye darungin ~

Fr.: semiconducteur intrinsèque   

A pure semiconductor containing no → impurity atoms. → extrinsic semiconductor.

intrinsic; → semiconductor.

n-type conductivity
  هازندگی ِ گونه‌ی ِ n   
hâzandegi-ye gune-ye n

Fr.: conductivité de type n   

The conductivity in a semiconductor caused by a flow of electrons, whereas p-type conductivity is caused by a flow of holes.

n standing for → negative; → type; → conductivity.

semiconductor
  نیم-هازا، نیمه-رسانا   
nim-hâzâ, nime-rasânâ

Fr.: semi-conducteur   

Any of various solid crystalline substances, such as germanium or silicon, which has conducting properties intermediate between metals and insulators.

semi-; → conductor.

semiconductor junction
  جوهه‌ی ِ نیم-هازا   
juhe-ye nim-hâzâ

Fr.: jonction semi-conducteur   

In a semiconductor device, a region of transition between semiconducting regions of different electrical properties.

semiconductor; → junction.

superconductivity
  اَبَر-هازندگی   
abar-hâzandegi

Fr.: superconductivité   

The phenomenon in which certain materials, when cooled to a sufficiently low temperature, lose all resistance to the flow of electricity.

super-; → conductivity

superconductor
  اَبَر-هازنده   
abar-hâzandé

Fr.: superconducteur   

A material which shows almost perfect conductivity at temperatures approaching absolute zero.

super-; → conductor.

thermal conduction
  هازش ِ گرمایی   
hâzeš-s garmâyi

Fr.: conduction thermale   

A process that occurs in a medium where a → temperature gradient exists: dQ = -κ(dT/dx)dA.dt, where dQ is the amount of heat passing through the time dt across an area dA in the direction of the normal x to this area and toward the reduction in temperature, κ is the → thermal conductivity, and (dT/dx) the temperature gradient.

thermal; → conduction.

thermal conductivity
  هازندگی ِ گرمایی   
hâzandegi-ye garmâyi

Fr.: conductivité thermale   

In → thermal conduction, the amount of heat passing across unit area per unit time and per unit → temperature gradient.

thermal; → conductivity.