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: 1965 Search : ion
proportional
  برپارشی   
barpâreši

Fr.: proportionnel   

Being in or characterized by proportion.
Math.: Of two quantities, having the same or a constant ratio or relation.

proportion + → -al.

proportional counter
  شمارگر ِ برپارشی   
šomârgar-e barpâreši

Fr.: compteur proportionnel   

A device in which an electronic detection system receives pulses that are proportional to the number of ions formed in a gas-filled tube by ionizing radiation.

proportional; → counter.

proportionality
  برپارشیگی   
barpârešigi

Fr.: proportionalité   

Math.: A relationship bewteen two quantities such that if one quantity changes the other changes in the same proportion; denoted as y ∝ x.

proportional + → -ity.

proportionality constant
  پایای ِ برپارشیگی   
pâyâ-ye barpârešigi

Fr.: constante de proportionalité   

Math.: A → constant that converts a proportionality into an → equation. Thus the proportionality constant k converts the proportionality y ∝ x into the equation y = kx.

proportionality + → constant.

proposition
  فراهل، گزاره   
farâhel, gozâré (#)

Fr.: proposition   

1) The act of offering or suggesting something to be considered, accepted, adopted, or done.
2) A plan or scheme proposed.
3) Logic: A statement in which something is affirmed or denied, so that it can therefore be significantly characterized as either true or false.
4) Math.: A formal statement of either a truth to be demonstrated or an operation to be performed; a theorem or a problem (Dictionary.com).

Verbal noun of → propose.

propositional
  گزاره‌ای   
gozaare#ay (#)

Fr.: propositionnel   

Logic: Of, relating to, or in the form of a → proposition.

proposition; → -al.

propositional constant
  پایای ِ گزاره‌ای   
pâyâ-ye gozaare#ay

Fr.: constante propositionnelle   

Logic: A → propositional symbol that represents a → specific → proposition.

propositional; → constant.

propositional logic
  گوییک ِ گزاره‌ای، ~ گزاره‌ها   
guyik-e gozâre-yi, ~ gozaarehâ

Fr.: logique propositionnelle   

A branch of logic that deals with the → truth values of logical statements (→ sentences, → propositions) and uses → logical connectives to build more complex → expressions. The distinctive feature of propositional logic is that it does not deal with logical relationships and properties that involve the parts of a statement smaller than the simple statements making it up. The propositions are evaluated as → true or → false. A more expressive system is provided by the → first-order logic.

proposition; → -al; → logic.

propositional symbol
  نماد ِ گزاره‌ای   
nemâd-e gozâreyi

Fr.: symbole propositionnel   

An upper case letter, e.g. "A," "B," "C," etc. representing a → proposition. Propositional symbols are divisible into two sorts: → propositional constants and → propositional variables.

propositional; → symbol.

propositional variable
  ورتنده‌ی ِ گزاره‌ای   
vartande-ye gozâre-yi

Fr.: variable propositionnel   

Logic: A → propositional symbol that represents any → proposition whatsoever.

propositional; → variable.

propulsion
  پیشرانش   
pišrâneš (#)

Fr.: propulsion   

The act or process of propelling. The state of being propelled.

Verbal noun from → propel.

protestation
  پاخوسش   
pâxoseš

Fr.: protestation   

1) The act of protesting.
2) Formal expression or declaration of objection, dissent, or disapproval (Dictionary.com).

protest; → -tion.

proton-proton reaction
  واژیرش ِ پروتون-پروتون   
vâžireš-e-e proton-proton

Fr.: réaction proton-proton   

A → thermonuclear reaction in which two protons collide at very high velocities and combine to form a → deuterium. See also → proton-proton chain.

proton; → reaction.

provocation
  فراوچ   
farâvac

Fr.: provocation   

1) The act of provoking.
2) Something that → incites, → instigates, angers, or irritates (Dictionary.com).

Verbal noun of → provoke.

public opinion
  پژان ِ همگانی   
pažân-e hamegâni

Fr.: opinion publique   

The collective opinion of many people on some issue, problem, etc., especially as a guide to action, decision, or the like (Dictionary.com).

public; → opinion.

publication
  واگانش   
vâgâneš

Fr.: publication   

1) The act of publishing a book, periodical, map, piece of music, engraving, or the like.
2) The act of bringing before the public; announcement.
3) The state or fact of being published (Dictionary.com).

Verbal noun of → publish.

pulsation
  تپش   
tapeš (#)

Fr.: pulsation   

The act of pulsating; beating or throbbing; vibration or undulation. → stellar pulsation.

Verbal noun of → pulse.

pulsation mode
  ترز ِ تپش، مُد ِ ~   
tarz-e tapeš, mod-e ~

Fr.: mode de pulsation   

The way in which pulsations occur in a star due to the fact that stars act as resonant cavities, as studied in → asteroseismology. A star may pulsate either with approximately spherical symmetry (radial pulsation), or as a series of waves running across the surface (non-radial pulsation). Pulsation may occur in a single mode or in multiple modes, depending on the type of star. Three different modes of pulsations have been detected through the → helioseismology of the → Sun: → p mode, → g mode, and → f mode, generated by acoustic, gravity, and surface gravity waves respectively. Also called → oscillation mode.

pulsation; → mode.

pulsational
  تپشی   
tapeši

Fr.: pulsationnel   

Of or pertaining to → pulsation. → pulsational instability; → pulsational pair-instability supernova.

pulsation; → -al

pulsational instability
  ناپایداری ِ تپشی   
nâpâydâri-ye tapeši

Fr.: instabilité pulsationnelle   

A term used to describe irregularly spaced, fine-scale structure in optically thick rings. The process relies on a combination of viscosity and self-gravity of ring material to produce this fine structure. Also known as overstability (Ellis et al., 2007, Planetary Ring Systems, Springer).

pulsational; → instability.

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