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PROPAGATION ATTENUATION [7 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2021-11-01

English

Subject field(s)
  • Optical Telecommunications
CONT

Fiber-optic cable that exhibits multimode propagation with a step index profile is thereby characterized as having higher attenuation and more time dispersion than the other propagation candidates.

French

Domaine(s)
  • Télécommunications optiques

Spanish

Save record 1

Record 2 2021-07-28

English

Subject field(s)
  • Optical Telecommunications
  • Optics
CONT

Optical path loss is used to measure the attenuation of the transmitted beams, attributed to propagation in the free space and reflection components.

French

Domaine(s)
  • Télécommunications optiques
  • Optique

Spanish

Save record 2

Record 3 2019-10-30

English

Subject field(s)
  • Acoustics (Physics)
  • Hydrology and Hydrography
  • Scientific Measurements and Analyses
  • Commercial Fishing
CONT

The propagation characteristics of ultrasound in sea water and its ultrasonic reflection loss on the sea bottom or on fish schools must be studied for both the design and the practical operation of echo sounders, fish finders... The propagation attenuation in a direction vertical to the sea surface is the result mainly of spherical divergence, but the attenuation in a horizontal direction is caused partly by absorption as well. This absorption becomes larger at higher frequencies...

French

Domaine(s)
  • Acoustique (Physique)
  • Hydrologie et hydrographie
  • Mesures et analyse (Sciences)
  • Pêche commerciale
OBS

Des ultrasons dans l'eau.

Spanish

Campo(s) temático(s)
  • Acústica (Física)
  • Hidrología e hidrografía
  • Medición y análisis (Ciencias)
  • Pesca comercial
Save record 3

Record 4 2011-05-16

English

Subject field(s)
  • Telecommunications
  • Radio Waves
DEF

The signal attenuation that would occur if all absorbing, diffracting, obstructing, scattering, and reflecting influences were sufficiently removed so as to have no effect on propagation.

OBS

free space loss; FSL: term and abbreviation officially approved by the International Civil Aviation Organization (ICAO).

Key term(s)
  • free space attenuation
  • free-space path loss

French

Domaine(s)
  • Télécommunications
  • Ondes radioélectriques
DEF

Affaiblissement idéal de propagation d'un signal à l'intérieur d'un espace où il n'y aurait que les deux antennes d'émission et de réception.

OBS

affaiblissement en espace libre; FSL : terme et abréviation uniformisés par l'Organisation de l'aviation civile internationale (OACI).

Key term(s)
  • affaiblissement dans l'espace libre

Spanish

Campo(s) temático(s)
  • Telecomunicaciones
  • Ondas radioeléctricas
DEF

Atenuación ideal de propagación que resultaría si todas las influencias que producen obstrucción, dispersión o reflexión fueran eliminadas de manera que no tuvieran efecto sobre la propagación, cuando el medio de propagación es el espacio libre.

OBS

atenuación en el espacio libre; FSL : término y abreviatura aceptados oficialmente por la Organización de Aviación Civil Internacional (OACI).

Save record 4

Record 5 2007-01-31

English

Subject field(s)
  • Space Physics
  • Remote Sensing
DEF

A coefficient that quantifies radiation attenuation in the direction of propagation due to interaction with the atmosphere.

CONT

The attenuation coefficient is the sum of the scattering and absorption coefficients.

OBS

extinction coefficient: term officially approved by the RADARSAT-2 Terminology Approval Group (RTAG).

French

Domaine(s)
  • Physique spatiale
  • Télédétection
DEF

Coefficient qui quantifie l'atténuation du rayonnement dans la direction de propagation due à l'interaction avec l'atmosphère.

OBS

coefficient d'atténuation : terme uniformisé par le Groupe de travail de la terminologie de RADARSAT-2 (GTTR).

Spanish

Campo(s) temático(s)
  • Física espacial
  • Teledetección
Save record 5

Record 6 2001-12-08

English

Subject field(s)
  • Telecommunications Transmission
  • Radar, Radio Guidance and Goniometry
DEF

In the propagation modeling for the land mobile satellite service, the attenuation of the line-of-sight component due to foliage, an occasional building, etc.

French

Domaine(s)
  • Transmission (Télécommunications)
  • Radar, radioguidage et radiogoniométrie

Spanish

Campo(s) temático(s)
  • Transmisión (Telecomunicaciones)
  • Guía radárica, radioguía y radiogoniometría
DEF

Duplicación entre dos agentes de sistema de directorio por la cual la información que aparece sombreada se copia y se mantiene utilizando el protocolo de sombreado de información de directorio.

OBS

No se están utilizando "caches" para servicios públicos de directorio.

Save record 6

Record 7 2000-11-22

English

Subject field(s)
  • Optics
DEF

the propagation of light waves in a transmission medium with a high level of attenuation resulting from diffusion of the waves.

French

Domaine(s)
  • Optique

Spanish

Save record 7

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