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COH [3 records]

Record 1 2021-08-19

English

Subject field(s)
  • War and Peace (International Law)
DEF

An agreed cessation of the fighting within a period of war.

CONT

[One mode] of terminating hostilities as distinct of the status of war itself [is applicable to hostilities both in a war, and in a non-war conflict] ... The terminology as to cessation of hostilities also includes a "pause" (i.e., a brief period of temporary cessation of particular kinds of operations, such as air bombardment), a "standstill" (this can cover not only a prohibition of hostilities, i.e., cease-fire, but also a cessation of all movement of armaments or personnel), and "de-escalation" (a diminution in the intensity magnitude and range of the hostilities).

OBS

cessation of hostilities; COH: designations standardized by NATO.

French

Domaine(s)
  • Guerre et paix (Droit international)
DEF

Arrêt réciproque des opérations de guerre entre belligérants, que cet arrêt résulte ou non d'un accord, qu'il implique ou non la fin de la guerre.

OBS

cessation des hostilités; COH : désignations normalisées par l'OTAN.

Spanish

Save record 1

Record 2 2004-02-16

English

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

A unit of measurement for the concentration of particulates in air.

OBS

A measurement of visibility interference in the atmosphere.

CONT

Indirect measurements of particulate matter have historically been made using two methodologies: the British Smoke Shade (BSS) sampler and the AISI sampler, which measures Coefficient of Haze (CoH). Both the BSS and the CoH techniques are based on optical properties of particles and are most sensitive to the sooty components of PM that fall in the size range of approximately -3.5-4.5 µm in diameter.

French

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

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). [...] Les objectifs de qualité de l'air pour les particules en suspension (PES) ne peuvent être exprimés avec justesse par l'indice de qualité de l'air (IQUA) parce que les stations canadiennes n'utilisent pas des appareils de mesure en temps réel des concentrations de particules. Toutefois, en raison de l'importance de la concentration des particules relativement à l'IQUA, on peut envisager les solutions de rechange provisoires suivantes : - des mesures quotidiennes des teneurs de 24 h en PES (par échantillonneur à grand débit); - le sous-indice COH/visibilité; - le sous-indice COH/particules inhalables.

CONT

On a par le passé effectué des mesures indirectes des matières particulaires en utilisant deux méthodes : les échantillonneurs British Smoke Shade (BSS) et AISI, qui mesurent le coefficient de transmission (CoH). Ces deux méthodes sont basées sur les propriétés optiques des particules et sont extrêmement sensibles aux éléments fuligineux des matières particulaires qui se situent dans une gamme de tailles d'environ - 3,5-4,5 µm de diamètre.

Spanish

Campo(s) temático(s)
  • Metrología y unidades de medida
  • Estudios y análisis del medio ambiente
  • Contaminación del aire
Save record 2

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

Save record 3

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