TERMIUM Plus®

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ATENUACION PROPAGACION [2 records]

Record 1 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 1

Record 2 2001-07-09

English

Subject field(s)
  • Telecommunications
  • Telecommunications Transmission
DEF

The path attenuation when the specified antennas are hypothetical isotropic elements.

French

Domaine(s)
  • Télécommunications
  • Transmission (Télécommunications)
DEF

Affaiblissement de propagation dans le cas où les antennes de référence seraient des antennes isotropes.

Spanish

Campo(s) temático(s)
  • Telecomunicaciones
  • Transmisión (Telecomunicaciones)
DEF

Atenuación de propagación en la que las antenas dadas son elementos hipotéticamente isotrópicos.

Save record 2

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