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TRACE GAS [14 records]

Record 1 2017-04-13

English

Subject field(s)
  • Biomass Energy
  • Chemical Engineering
CONT

The pyrogasification is a method used to produce fertiliser rich in potassium and trace elements from the burning of organic waste, mainly sludge, in the absence of oxygen. That process also enables the extraction of gas.

French

Domaine(s)
  • Énergie de la biomasse
  • Génie chimique
DEF

La pyrogazéification consiste en un transfert ultra-rapide de la chaleur au cœur de la matière en l'absence d'oxygène permettant de transformer thermiquement les matières organiques pour en tirer à la fois du gaz, source d'énergie utilisable, et des engrais riches en potasse et en oligo-éléments.

Spanish

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Record 2 2016-03-30

English

Subject field(s)
  • Atomic Physics
  • Analytical Chemistry
  • Scientific Measurements and Analyses
DEF

gas sorption effects: The physical processes whereby some gases are adsorbed onto or desorbed from the surfaces of a solid without transformation of the molecules.

OBS

The force of attraction between some gases and solids is purely physical and depends on the nature of the participating material. Natural gas can contain several components that exhibit strong sorption effects. Special care should be taken when determining trace concentrations of heavy hydrocarbons, water, sulfur compounds, and hydrogen.

OBS

gas sorption effect: The plural form of this term (gas sorption effets) and the plural definition have been standardized by ISO in 2014.

Key term(s)
  • gas sorption effects

French

Domaine(s)
  • Physique atomique
  • Chimie analytique
  • Mesures et analyse (Sciences)
DEF

effets de sorption du gaz : Phénomènes physiques d’adsorption ou de désorption observés entre certains gaz et la surface d’un solide sans transformation des molécules.

OBS

La force d’attraction entre certains gaz et certains solides est purement physique et dépend de la nature des matériaux en contact. Le gaz naturel peut renfermer un certain nombre de constituants présentant de forts effets de sorption. Il convient de veiller à ces phénomènes, en particulier lors de la détermination des concentrations d’éléments à l’état de traces, comme les hydrocarbures lourds, l’eau, les composés soufrés et l’hydrogène.

OBS

effet de sorption du gaz : Le terme au pluriel (effets de sorption du gaz) et la définition au pluriel ont été normalisés par l'ISO en 2014.

Key term(s)
  • effets de sorption du gaz

Spanish

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Record 3 - external organization data 2011-07-11

English

Subject field(s)
  • Chemistry
  • Nuclear Fission Reactors
  • Lamps
  • Compartment - Canadian Nuclear Safety Commission
DEF

Element of atomic number 54, noble gas group of the periodic table, aw 131.30 ...

CONT

A colorless, very heavy, odorless noble gas, xenon occurs in the earth's atmosphere in trace amounts and was part of the first noble gas compound synthesized.

CONT

Xenon is used in thermionic tubes and strobe lighting.

French

Domaine(s)
  • Chimie
  • Réacteurs nucléaires de fission
  • Lampes
  • Tiroir - Commission canadienne de sûreté nucléaire
DEF

Corps simple de symbole Xe, de numéro atomique 54 et de poids atomique 131,30.

OBS

C'est un produit de fission de l'uranium, et le plus important poison des réacteurs thermiques.

Spanish

Campo(s) temático(s)
  • Química
  • Reactores nucleares de fisión
  • Lámparas
  • Compartimiento - Comisión Canadiense de Seguridad Nuclear
DEF

Elemento químico de número atómico 54. Es uno de los gases raros. Se utiliza en algunos tiratrones y en ciertos tubos de descarga gaseosa. Símbolo químico: Xe.

OBS

adj: xenónico.

Save record 3

Record 4 2010-04-09

English

Subject field(s)
  • Titles of Provincial Government Programs (Canadian)
  • Environmental Economics
  • Climate Change
  • Air Pollution
OBS

of the International Global Atmospheric Chemistry.

French

Domaine(s)
  • Titres de programmes de gouvernements provinciaux canadiens
  • Économie environnementale
  • Changements climatiques
  • Pollution de l'air

Spanish

Save record 4

Record 5 2007-01-25

English

Subject field(s)
  • Anti-pollution Measures
  • Climate Change
CONT

The trace element iron has been recently shown to play a critical role in nutrient utilization, phytoplankton growth and therefore the uptake of carbon dioxide from the surface waters of the global ocean. Carbon fixation in the surface waters, via phytoplankton growth, shifts the ocean/atmosphere exchange equilibrium for carbon dioxide. As a result, levels of atmospheric carbon dioxide(a greenhouse gas) and iron flux to the oceans have been linked to climate change(glacial to interglacial transitions). These recent findings have led some to suggest that large scale iron fertilization of the world's oceans may therefore be a feasible strategy for controlling climate.

French

Domaine(s)
  • Mesures antipollution
  • Changements climatiques
CONT

À la surface des océans, le phytoplancton absorbe le CO2 atmosphérique via la photosynthèse. [...] La stimulation de la production du phytoplancton permettrait donc d'augmenter la pompe biologique du carbone. Différentes méthodes ont été proposées pour stimuler cette productivité marine, parmi lesquelles : la fertilisation par le fer («iron fertilization»), la culture intensive des algues [...] Un apport de fer aux zones océaniques déficitaires permettrait donc de stimuler la production primaire marine, et par conséquent d'augmenter l'exportation de carbone vers les fonds océaniques.

Spanish

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Record 6 2002-07-08

English

Subject field(s)
  • Environmental Studies and Analyses
  • Analytical Chemistry
  • Air Pollution
CONT

Log standard deviation from the average tropospheric mixing ratio of a trace gas as function of residence time.

French

Domaine(s)
  • Études et analyses environnementales
  • Chimie analytique
  • Pollution de l'air

Spanish

Campo(s) temático(s)
  • Estudios y análisis del medio ambiente
  • Química analítica
  • Contaminación del aire
Save record 6

Record 7 2001-03-15

English

Subject field(s)
  • Titles of International Programs
  • Climate Change
OBS

[An] activity of the International Global Atmospheric Chemistry (IGAC) project of the International Geosphere Biosphere Program.

French

Domaine(s)
  • Titres de programmes internationaux
  • Changements climatiques
OBS

Programmes récents (1994) consacrés à l'étude de phénomènes reliés au réchauffement climatique. Ne semble pas avoir d'équivalent français.

Spanish

Save record 7

Record 8 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

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Record 9 1998-01-27

English

Subject field(s)
  • Titles of International Programs
  • Environmental Economics
  • Climate Change
  • Air Pollution

French

Domaine(s)
  • Titres de programmes internationaux
  • Économie environnementale
  • Changements climatiques
  • Pollution de l'air

Spanish

Save record 9

Record 10 1998-01-27

English

Subject field(s)
  • Titles of Provincial Government Programs (Canadian)
  • Environmental Economics
  • Climate Change
  • Air Pollution

French

Domaine(s)
  • Titres de programmes de gouvernements provinciaux canadiens
  • Économie environnementale
  • Changements climatiques
  • Pollution de l'air

Spanish

Save record 10

Record 11 1992-01-08

English

Subject field(s)
  • Police

French

Domaine(s)
  • Police

Spanish

Save record 11

Record 12 1991-06-18

English

Subject field(s)
  • Climate Change
  • Electromagnetic Radiation
DEF

Relating to radiative effect.

CONT

The estimated radiative forcing due to the observed trace gas increases is shown in Table 2. Human activities during the last century have enhanced the radiative heating of the planet by an amount comparable to increasing the sun's output by about 0. 9%.

French

Domaine(s)
  • Changements climatiques
  • Rayonnements électromagnétiques
DEF

Relatif à l'effet produit sur le rayonnement.

CONT

Un doublement du CO2 atmosphérique correspond approximativement à un forçage radiatif supplémentaire, c'est-à-dire à un excédent thermique pour l'atmosphère, le sol continental et les océans, de [4W par mètre carré].

OBS

Dans le domaine du réchauffement climatique, il est parfois difficile de saisir le rapport entre l'adjectif «radiatif» et le terme qu'il détermine. Le sens que les dictionnaires généraux reconnaissent à l'adjectif «radiatif» est celui de «relatif aux radiations». De ce fait, il est souvent nécessaire d'intercaler, entre le déterminant et le terme pivot, un terme intermédiaire afin de préciser le sens exact de radiatif : «gaz à effet radiatif» pour «gaz radiatif» par exemple.

Spanish

Save record 12

Record 13 1989-04-03

English

Subject field(s)
  • Scientific Instruments
  • Environmental Studies and Analyses
  • Air Pollution
CONT

TAGA. The Trace Atmospheric Gas Analyser was developed at the University of Toronto and SCIEX Ltd. The device uses a quadrapole mass spectrometer in continuous operational mode. System sensitivity is high(ppt levels), selectivity for various pollutants is good, and can be used in a mobile environment. EPS is evaluating the device for a monitoring role. The system is quite expensive(well over $100, 000) and requires a high level of expertise to operate. Because of its price it will probably be limited to use by organizations conducting large atmospheric surveys.

French

Domaine(s)
  • Instruments scientifiques
  • Études et analyses environnementales
  • Pollution de l'air
OBS

Sigle de l'expression anglaise.

Spanish

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Record 14 1986-05-20

English

Subject field(s)
  • Installation and Maintenance (Electrical)
CONT

(dans l'énoncé de fonctions d’un mécanicien-opérateur en chef de chaudière)-examining electrical circuits and gas installations for conformance with blueprints and drawings by physical trace and ohmmeter checks.

French

Domaine(s)
  • Installation et maintenance (Électricité)
OBS

Proposition de M. Jean-Paul Champagne, terminologue de la section militaire et technique. Selon ce dernier, en France on dit "faire sonner le circuit" mais cette expression est totalement inconnue au Québec.

Spanish

Save record 14

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