Fr.: flux de météorites
The total mass of extraterrestrial objects that land on Earth during a given time period. The meteorite flux is currently estimated to be about 107 to 109 kg yr-1. Much of this material is dust-sized objects called → micrometeorites.
šaxâne-yi, šahâbsangi (#)
Of or pertaining to a → meteorite.
farâvâni-ye šaxâne-yi, ~ šahânsangi
Fr.: abondance météoritique
Fr.: impact météoritique
A striking of a meteorite against another body, especially the solar system planets or satellites.
šaxânik, šahâbsangšenâsi, šahâbsangik
The science or study of meteorites.
A solid object in → interplanetary space before it reaches the Earth's atmosphere. Meteoroids are of → silicate and/or → metallic matter having a size from tiniest grains up to that of the smallest → asteroids.
Fr.: courants de météoroïdes
The meteoroids distributed all along an → orbit and diffused somewhat around it.
Fr.: essaim de météoroïdes
A relatively dense collection of meteoroids at certain spots along some → meteoroid streams.
Fr.: observation météorologique
Evaluation or measurement of one or more meteorological elements.
Fr.: observatoire météorologique
A scientific establishment dedicated to making precise and detailed meteorological observations and to studying and forecasting atmospheric phenomena by means of special equipments.
The study of the physics, chemistry, and dynamics of the Earth's atmosphere, including the related effects at the air-earth boundary over both land and the oceans.
From Gk. meteorologia "discussion of celestial phenomena," from meteoron→ meteor + -logia, &rarr-logy.
Havâšenâsi, from havâ "weather, air," → air.
The fundamental unit of length in the metric system, now defined as 1/299,792,458 of the distance light travels in a vacuum in one second. Abbreviation: m.
From Fr. mètre, from Gk. metron "measure," from PIE base *me- "to measure" (cf. O.Pers., Av. mā- "to measure;" Skt. mati "measures;" L. metri "to measure").
Metr, loan from Fr.
A colorless, odorless, inflammable gas gas of formula CH4; the simplest hydrocarbon.
From meth- a combining form representing methyl + -ane a suffix used in names of hydrocarbons of the methane or paraffin series.
Fr.: méthanol, alcool méthylique
Alcohol, also known as methyl alcohol, formula CH3OH, formed in small quantities in the oxidation of methane. → methanol maser.
From → methane + -ol a suffix used in the names of chemical derivatives.
Fr.: maser méthanol
A maser source in which excited methanol molecules (CH3OH) produce → maser emission. Methanol masers are signposts of the early stages of star formation, many being associated with sources that have not developed an → H II region. There are more than 20 different methanol transitions that have been observed. They are divided into two categories: Class I, excited by collisions, and class II, excited by infrared radiation. The most important class I masers are at a frequency of 44.1 GHz, while he most important class II masers are at a frequency of 6.7 GHz.
A manner or mode of procedure, especially an orderly, logical, or systematic way of instruction, inquiry, investigation, experiment, and so on.
From M.Fr. méthode, from L. methodus "way of teaching or going," from Gk. methodus "scientific inquiry, method of inquiry," originally "following after," from → meta- "after" + hodos "way."
Raveš "mthod," originally "going, walking," from row "going," present stem of raftan "to go, walk;" Mid.Pers. raftan, raw-, Proto-Iranian *rab/f- "to go; to attack" + -eš a suffix of verbal nouns.
method of least squares
raveš-e kamtarin cârušhâ
Fr.: méthode des moindres carrés
A method of fitting a curve to data points so as to minimize the sum of the squares of the distances of the points from the curve.
method of small perturbations
raveš-e parturešhâ-ye kucak
Fr.: méthode des petites perturbations
The linearization of the appropriate equations governing a system by the assumption of a steady state, with departures from that steady state limited to small perturbations. Also called perturbation method.
method of successive approximations
raveš-e nazdinešhâ-ye payâpey
Fr.: méthode d'approximations successives
The solution of an equation or by proceeding from an initial approximation to a series of repeated trial solutions, each depending upon the immediately preceding approximation, in such a manner that the discrepancy between the newest estimated solution and the true solution is systematically reduced.
Back formation from Fr. méthylène, → methylene.