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GASEOUS EMISSION [6 records]

Record 1 2002-11-21

English

Subject field(s)
  • Physics
  • Telecommunications
  • Meteorology
DEF

Dark lines in a continuous spectrum caused by absorption by a gaseous element. The positions(i. e. the wavelengths) of the dark absorption lines are identical with those of the bright lines given by the same element in emission.

French

Domaine(s)
  • Physique
  • Télécommunications
  • Météorologie
DEF

Très petit intervalle de longueurs d'onde (ou de fréquences) dans le spectre électromagnétique à l'intérieur duquel l'énergie rayonnante est absorbée par le milieu qu'elle traverse.

OBS

raie : ligne brillante d'un spectre d'émission, ou ligne obscure d'un spectre d'absorption, correspondant à une radiation monochromatique de fréquence ou de longueur d'onde bien définie : les deux raies D du spectre solaire sont les raies d'absorption du sodium.

Spanish

Campo(s) temático(s)
  • Física
  • Telecomunicaciones
  • Meteorología
DEF

"Gama" diminuta de longitudes de onda (o frecuencias) del espectro electromagnético dentro de la cual la energía radiante es absorbida por el medio que atraviesa.

Save record 1

Record 2 2000-07-19

English

Subject field(s)
  • Air Pollution
  • Pollutants
  • Climatology
  • Air Transport
CONT

In order to record the separate effects of gaseous emissions and dust on the pH of pure water, these two components were investigated separately.

OBS

gaseous emission : term officially approved by the International Civil Aviation Organization(ICAO).

French

Domaine(s)
  • Pollution de l'air
  • Agents de pollution
  • Climatologie
  • Transport aérien
CONT

D'une manière générale, les études en matière de visibilité montrent que les émissions gazeuses et particulaires des foyers de combustion fixes ou mobiles sont les principales causes de dégradation de la transparence de l'air, et l'on ne pourrait qu'encourager en France la prise en compte des caractéristiques de visibilité en tant que critère de qualité de l'air.

OBS

émission gazeuse : terme uniformisé par l'Organisation de l'aviation civile internationale (OACI).

Spanish

Campo(s) temático(s)
  • Contaminación del aire
  • Agentes contaminantes
  • Climatología
  • Transporte aéreo
OBS

emisiones gaseosas : término aceptado oficialmente por la Organización de Aviación Civil Internacional (OACI).

Save record 2

Record 3 1998-08-05

English

Subject field(s)
  • Foundry Practice
DEF

Furnace in which the calorific emission is produced by the radiation from tubes where a gaseous fuel is burnt.

French

Domaine(s)
  • Fonderie
DEF

Four dans lequel l'émission calorifique est produite par le rayonnement de tubes où brûle un combustible gazeux.

Spanish

Save record 3

Record 4 1998-05-14

English

Subject field(s)
  • Analytical Chemistry
CONT

In 1956, Harley and Pretorius described a simple discharge detector for gas chromatography based on the electrical properties of a glow discharge, the voltage across the gaseous discharge being a function of the type of gas present. Druyvesteyn and Penning in 1940 reviewed the complex nature of the glow discharge, noting that the discharge is maintained by electrons emitted from the cathode which result from processes related to positive ion bombardment, photoelectric emission, and collisions with excited atoms. When trace quantities of a material eluted from a chromatographic column enter the detector(consisting of a small platinum disk cathode and a tungsten wire anode), a voltage change resulted which was recorded.

OBS

Using neon lamps Pitkethly found ... that these detector were current and pressure independent at 1-1.5 mS and 3-5 mm Hg .... In 1958, Roberts and Hinkle evaluated glow discharge tubes as detectors for compounds in the concentration range of 5-500 ppm and concluded that the detector was not applicable to general-purpose use .... More recently, Wilhite described glow discharge-type devices which act electrically similar to a gas-filled voltage-regulator tube ... Riley described the use of an argon purity meter, a glow-type discharge detector, for the determination of small concentrations (0-1500 ppm) of impurity gases in argon.

French

Domaine(s)
  • Chimie analytique

Spanish

Save record 4

Record 5 1986-10-08

English

Subject field(s)
  • Astronomy
DEF

An emission lines in the spectra of gaseous nebulae which cannot be identified by comparison with laboratory spectra. These lines are usually caused by doubly ionized atoms of oxygen.

French

Domaine(s)
  • Astronomie
DEF

Une des radiations ou raies qui ne peuvent pas être obtenues dans les conditions habituelles, au laboratoire, notamment parce que les raies exigent l'absence presque absolue de chocs sur les atomes excités (émettre) et, par suite, une densité gazeuse extrêmement faible.

Spanish

Save record 5

Record 6 1981-05-22

English

Subject field(s)
  • HVAC Distribution Systems
  • Combustion and Fuels (Fireplaces)
OBS

This combustion takes place in a furnace and generates gaseous products which at 55 ° C are exhausted by a fan, being cooled and cleaned by a variable intake filter before final emission via a chimney.

French

Domaine(s)
  • Distribution et évacuation (chauffage et conditionnement d'air)
  • Combustion et combustibles (Foyers)
OBS

Les gaz brûlés qui sont refroidis, puis dépoussiérés dans un venturi à col variable, sont aspirés par la soufflante à une température de 55 ° et expulsés par la cheminée.

Spanish

Save record 6

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