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COEFFICIENT UNIT [3 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 - external organization data 2006-02-01

English

Subject field(s)
  • Compartment - ISO/IEC JTC 1 Information Technology Vocabulary
Universal entry(ies)
19.01.05 (2382)
ISO/IEC standard entry number
DEF

functional unit whose output analog variable is equal to the input analog variable multiplied by a constant

OBS

coefficient unit; scale multiplier: terms and definition standardized by ISO/IEC [ISO 2382-19:1989].

French

Domaine(s)
  • Tiroir - ISO/CEI JTC 1 Vocabulaire des technologies de l'information
Entrée(s) universelle(s)
19.01.05 (2382)
ISO/IEC standard entry number
DEF

unité fonctionnelle dont la variable analogique de sortie est égale à la variable analogique d'entrée multipliée par une constante

OBS

potentiomètre : terme et définition normalisés par l'ISO/CEI [ISO 2382-19:1989].

Spanish

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Record 2 2004-06-30

English

Subject field(s)
  • Computer Mathematics
  • Electronic Components
DEF

A functional unit whose output analog variable is equal to the input analog variable multiplied by a constant.

OBS

coefficient unit; scale multiplier: terms standardized by CSA and ISO.

French

Domaine(s)
  • Mathématiques informatiques
  • Composants électroniques
DEF

Unité fonctionnelle dont la variable analogique de sortie est égale à la variable analogique d'entrée multipliée par une constante.

OBS

potentiomètre; potentiomètre numérique : termes normalisés par la CSA et l'ISO.

Spanish

Campo(s) temático(s)
  • Matemáticas para computación
  • Componentes electrónicos
DEF

Dispositivo en que la variable que se produce a la entrada del mismo, multiplicada por una constante, origina la variable que se produce a la salida.

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Record 3 2004-02-16

English

Subject field(s)
  • Metrology and Units of Measure
  • Environmental Studies and Analyses
  • Air Pollution
DEF

A measure of light absorption by particles, defined as that quantity of light scattering solids producing an optical density of 0.1.

CONT

coefficient of haze (COH) (in atmospheric chemistry): One technique of measurement of the amount of filterable particulate matter suspended in air which has been used in the past depends upon drawing a measured sample of air (usually 1 000 linear feet) through a paper or membrane filter. A measurement is made of the intensity of light transmitted through the dust spot formed relative to that transmitted through an identical clean filter. The dirtiness of the air is reported in terms of the COH unit. This relates to the quantity of particulate material which produces an optical density, lg (I 0 /I) of 0.01 when measured by light transmission at 400 nm and relative to the transmission of an identical dust-free filter taken as 100%. Thus a filter which transmitted 50% relative to the clean filter has an absorbance of 0.301 or 30.1 COH units. This is not a recommended measure of filterable particulate matter since the size, colour and other properties of the aerosol and the air in which it is suspended affect the results. [Source: IUPAC Compendium of Chemical Terminology, 2nd Edition (1997).]

French

Domaine(s)
  • Unités de mesure et métrologie
  • Études et analyses environnementales
  • Pollution de l'air
CONT

Certains paliers de gouvernement utilisent des sous-indices de visibilité et de particules inhalables à partir de mesures de la visibilité de 1 h et de 2 h en unités COH. Le Comité considère que cette méthode n'est pas aussi fiable que les mesures des concentrations en temps réel de particules inhalables.

OBS

Le COH («coefficient of haze unit») est le coefficient de transmission ou l'indice d'opacité (quantité de matières solides donnant une densité optique de 0,0l).

Spanish

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