TERMIUM Plus®

The Government of Canada’s terminology and linguistic data bank.

VELOCITY WAVE PROPAGATION [9 records]

Record 1 2011-09-28

English

Subject field(s)
  • Vulcanology and Seismology
  • Geophysics
DEF

A major type of surface wave having a horizontal motion that is shear or transverse to the direction of propagation. Its velocity depends only on density and rigidity modulus, and not on bulk modulus.

OBS

Love wave; Querwellan wave; Q wave; LQ wave: terms extracted from the "Disarmament and Peace Keeping" glossary with the permission of the United Nations Office at Geneva.

French

Domaine(s)
  • Volcanologie et sismologie
  • Géophysique
DEF

[...] ondes transversales guidées dans la croûte et le manteau [...]

OBS

onde de Love; onde Q; onde de Love Q : termes tirés du lexique «Désarmement et Maintien de la Paix» avec l'autorisation de l'Office des Nations Unies à Genève.

Key term(s)
  • onde sismique de Love

Spanish

Campo(s) temático(s)
  • Vulcanología y sismología
  • Geofísica
DEF

Onda sísmica de superficie de propagación horizontal, que desplaza al suelo perpendicularmente a su dirección de propagación.

Save record 1

Record 2 2011-02-04

English

Subject field(s)
  • Hydrology and Hydrography
DEF

A wave whose velocity of propagation is controlled primarily by gravity.

CONT

All waves of consequence on the ocean surface or interfaces are gravity waves, for the surface tension of the water becomes negligible at wavelengths of greater than a few centimeters.

CONT

Water waves more than 2 inches long are considered gravity waves. Waves longer then 1 inch and shorter than 2 inches are in an indeterminate zone between capillary and gravity waves.

French

Domaine(s)
  • Hydrologie et hydrographie
DEF

Perturbation interne du champ de gravité de la masse océanique qui se propage sous forme d'une onde.

CONT

Un tsunami est étymologiquement une vague déferlant sur un port (du japonais tsu : port et nami : vague). Cette vague est en fait une onde de gravité due à un séisme, un glissement brusque du fond marin, la chute d'une météorite ou à une éruption volcanique. Le déplacement rapide du plancher océanique génère des vagues rapides (de 700 à 800 km/h), de grande longueur d'onde (400 à 500 km), et dont la hauteur croit quand la profondeur d'eau diminue.

Spanish

Campo(s) temático(s)
  • Hidrología e hidrografía
Save record 2

Record 3 2010-12-29

English

Subject field(s)
  • Remote Sensing
CONT

New methods of acoustic imaging are presented that provide images with reduced reverberation noise and images of nonlinear scattering and propagation parameters of the object, and estimation methods of corrections for wave front aberrations produced by spatial variations in the acoustic propagation velocity. The methods find use in a variety of applications such as acoustic imaging of geological structures, SONAR imaging of sub-sea objects, and medical ultrasound imaging. The methods are based on processing of the received signal from transmitted dual frequency band acoustic pulse complexes with overlapping high and low frequency pulses. The high frequency pulse is used for the image reconstruction and the low frequency pulse is used to manipulate the nonlinear scattering and/or propagation properties of the high frequency pulse.

OBS

acoustic imaging: term used at Natural Resources Canada - Earth Sciences Sector.

French

Domaine(s)
  • Télédétection
CONT

[...] un procédé d'imagerie acoustique qui intercepte les ondes sonores propagées par des bruits à la surface d'un objet et mémorise la signature de chaque son dans une banque informatique de signaux.

OBS

imagerie acoustique : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

PHR

Imagerie acoustique haute résolution.

Spanish

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Record 4 2010-03-12

English

Subject field(s)
  • Weather Stations and Meteorological Instruments and Equipment
DEF

An anemometer which measures wind speed by means of the properties of wind-borne sound waves.

CONT

The measurement of high frequency fluctuations of wind can also be made with hot wire and sonic anemometers ... The sonic anemometer uses the difference in the velocity of propagation of two ultrasonic sound pulses, one moving with and one against the wind, to determine the wind speed. Sonic anemometers can detect wind speed fluctuations to about 50 Hz and 0.1 m/s.

CONT

sonic anemometer... operates on the principle that the propagation velocity of a sound wave in a moving medium is equal to the velocity of sound with respect to the medium plus the velocity of the medium. The sonic anemometer is an absolute instrument and has the advantages of a very short time-constant and an absence of moving mechanical parts.

CONT

The acoustic anemometer uses the fact that wind affects the speed of a sound signal.

PHR

3-axis, 3-D, 3-dimensional, Gill, omnidirectional, solent, three-axis, three-dimensional sonic anemometer.

French

Domaine(s)
  • Stations, instruments et équipements météorologiques
CONT

Les anémomètres soniques basés sur la variation de la vitesse de propagation du son dans l'air en mouvement : le son se propageant plus vite dans le sens du vent que dans le sens opposé.

PHR

Anémomètre sonique mono-dimensionnel, Solent, tridimensionnel

Spanish

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Record 5 2004-03-19

English

Subject field(s)
  • Space Physics
DEF

Magnetohydrodynamic wave whose propagation velocity depends on the temperature of the medium. [Definition standardized by ISO. ]

CONT

The existense of a conducting layer in the upper atmosphere results also in many other interesting phenomena. Around the plasma density maximum F-layer, ... a so-called ionospheric waveguide is formed for magnetosonic waves.

OBS

These waves resemble sound waves, from which they differ, however, in that the directions of particle movement and wave propagation are not parallel.

OBS

magnetosonic wave: term standardized by ISO.

French

Domaine(s)
  • Physique spatiale
DEF

Onde magnétohydrodynamique dont la vitesse de propagation dépend de la température du milieu. [Définition normalisée par l'ISO.]

OBS

Ces ondes, qui se rapprochent des ondes sonores, en diffèrent notamment par le fait que la direction du mouvement des particules n'est en général pas parallèle à la direction de propagation de l'onde.

OBS

onde magnétosonore : terme normalisé par l'ISO.

Spanish

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Record 6 1998-09-30

English

Subject field(s)
  • Soil Tests (Construction)
  • Soil Mechanics (Engineering)
CONT

Experimental ultrasonic wave propagation in sedimentary rocks : Signal processing related to the failure process... In a diagram with stress deviator versus confining pressure, the existence of correlations is revealed between strain and damage fields and the evolution of ultrasonic parameters, especially velocity and quality factor.

Key term(s)
  • deviator of stress

French

Domaine(s)
  • Essais du sol (Construction)
  • Mécanique des sols
DEF

Tenseur des contraintes obtenu en soustrayant la moyenne des composantes de contrainte normale d'un tenseur de contraintes, de chacune des composantes de contrainte normale.

Key term(s)
  • déviateur de contraintes

Spanish

Save record 6

Record 7 1998-06-29

English

Subject field(s)
  • Acoustics (Physics)
DEF

A complex sound wave’s separation into its frequency components as it passes through a medium; usually measured by the rate of change of velocity with frequency.

CONT

... under what may be termed ordinary conditions, the velocity of sound ... is independent of the frequency - i.e., there is no so-called dispersion ...

CONT

When the velocity of sound... becomes dependent on frequency, the shape of a complex wave changes during propagation and dispersion is said to occur.

French

Domaine(s)
  • Acoustique (Physique)
DEF

Phénomène causé par la variation de la vitesse du son en fonction de la fréquence, comme par exemple la séparation d'une onde acoustique complexe en ses différentes composantes. [Terme et définition normalisés par l'AFNOR et reproduits avec son autorisation.]

OBS

Le terme «diffusion» ne doit pas être employé dans ce sens [Justification reproduite avec l'autorisation de l'AFNOR.]

Spanish

Save record 7

Record 8 1996-12-17

English

Subject field(s)
  • Fluid Mechanics and Hydraulics (Physics)

French

Domaine(s)
  • Mécanique des fluides et hydraulique (Physique)
DEF

Pulsation de l'onde généralement exprimée en degrés sexagésimaux par heure de temps moyen.

Spanish

Campo(s) temático(s)
  • Mecánica de fluidos e hidráulica (Física)
Save record 8

Record 9 1995-11-30

English

Subject field(s)
  • Hydrology and Hydrography
  • Fluid Mechanics and Hydraulics (Physics)
  • Scientific Measurements and Analyses
DEF

The velocity of propagation of a wave through a fluid medium relative to the undisturbed velocity of the fluid through which the disturbance is propagated.

French

Domaine(s)
  • Hydrologie et hydrographie
  • Mécanique des fluides et hydraulique (Physique)
  • Mesures et analyse (Sciences)
DEF

Vitesse de propagation d'une onde de pression ou d'une perturbation à travers un milieu fluide, qui se superpose à la vitesse propre de ce fluide.

Spanish

Campo(s) temático(s)
  • Hidrología e hidrografía
  • Mecánica de fluidos e hidráulica (Física)
  • Medición y análisis (Ciencias)
DEF

Velocidad de propagación de una onda.

Save record 9

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