TERMIUM Plus®

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

THERMAL CONTRAST [12 records]

Record 1 2019-11-26

English

Subject field(s)
  • Air Conditioning and Heating
  • Energy Transformation
  • Modern Construction Methods
CONT

In contrast to other types of solar applications such as solar heating, the biggest demand for cooling occurs when the solar radiation is at its most intense, thereby making the marriage of solar thermal energy and solar cooling all the more attractive.

French

Domaine(s)
  • Conditionnement de l'air et chauffage
  • Transformation de l'énergie
  • Procédés de construction modernes

Spanish

Campo(s) temático(s)
  • Acondicionamiento de aire y calefacción
  • Transformación de la energía
  • Métodos de construcción modernos
CONT

El llamado aire acondicionado solar utiliza la energía solar térmica como fuente de energía para conseguir refrigeración. Obtener frío desde el calor es una paradoja, pero es posible gracias a la técnica de refrigeración por absorción.

Save record 1

Record 2 2015-09-09

English

Subject field(s)
  • Optics
  • Scientific Instruments
  • Biological Sciences
CONT

Fluorescence correlation spectroscopy(FCS) is one of the many different modes of high-resolution spatial and temporal analysis of extremely low concentrated biomolecules. In contrast to other fluorescence techniques, the parameter of primary interest is not the emission intensity itself, but rather spontaneous intensity fluctuations caused by the minute deviations of the small system from thermal equilibrium.... Fluorescence correlation spectroscopy has been developed in the early seventies as a special case of relaxation analysis.

French

Domaine(s)
  • Optique
  • Instruments scientifiques
  • Sciences biologiques
CONT

Spectroscopie par corrélation de fluorescence (FCS) - La FCS est une technique basée sur l'analyse des fluctuations d'intensité d'espèces fluorescentes diffusant à l'intérieur d'un volume de l'ordre du femtolitre (défini par le laser d’excitation). La constante de diffusion, la concentration locale et la brillance de chacune de ces espèces, étant reliées à leurs propriétés photophysiques et hydrodynamiques, peuvent ainsi être déterminées.

OBS

La FCS est utilisée en biologie cellulaire.

Spanish

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Record 3 2011-01-06

English

Subject field(s)
  • Analytical Chemistry
CONT

In contrast to the automatic recording instruments monitoring volume increases at constant pressure, van de Craats maintained the volume constant and recorded automatically the pressure changes by means of an electromagnetic manometer devised by Kinkel.... In addition to van de Craats’ work with pressure-sensing devices, Novák and Janák constructed a detector which represents the pneumatic analog of a Wheatstone bridge, employing the dynamic effects of pneumatic obstructions such as capillaries and constrictions for determining component fractions emerging from the gas chromatographic column. Requiring no electrical power yet having an accuracy comparable to high precision thermal conductivity cells, it expresses the pressure differential, either differentially or integrally, caused by the eluted component as a diagonal from zero. Furthermore, the substance analyzed is never in contact with the detector.

French

Domaine(s)
  • Chimie analytique

Spanish

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Record 4 2007-01-09

English

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

The degree of detectable temperature difference between adjacent areas and/or objects having unequal temperatures at a particular moment.

OBS

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

French

Domaine(s)
  • Physique spatiale
  • Télédétection
DEF

Écart de température (en degrés) existant entre des zones ou des objets adjacents qui présentent ponctuellement des variations de température.

OBS

contraste thermique : terme uniformisé par le Groupe de travail de la terminologie de RADARSAT-2 (GTTR).

Spanish

Save record 4

Record 5 2005-09-07

English

Subject field(s)
  • Pipes and Fittings
CONT

Even from high altitudes, steam line inspections are one of the easiest applications for the aerial infrared thermographer. Thermal contrast between active underground steam lines(especially leaks) and the surrounding ground are usually good.

French

Domaine(s)
  • Tuyauterie et raccords
CONT

Une des nombreuses innovations que l'entreprise a effectué a été de modifier sa conduite de vapeur pour éliminer le besoin de purger la vapeur.

Spanish

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Record 6 2003-05-22

English

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

Turbulent vertical motions that result from surface heating and the subsequent rising and sinking of air.

CONT

Thermal turbulence in the atmosphere is usually the main factor that limits the resolution, or fine detail, that can be seen on the planets or the moon. When the seeing is good, planetary detail is distinct and has better contrast. Bad seeing is characterized by a dynamic blurring, or even severe motion of the entire planetary disk.

French

Domaine(s)
  • Physique de l'atmosphère
  • Mécanique des fluides et hydraulique (Physique)
CONT

La turbulence thermique résulte des mouvements convectifs provoqués par le réchauffement de la basse atmosphère au contact du sol captant l'énergie solaire.

CONT

On peut distinguer deux types de turbulence : la turbulence mécanique (tourbillons créés par la différence de vitesse des masses d'air, ou par le mouvement de l'air qui entre en contact avec des objets), et la turbulence thermique (tourbillons créés par la différence de température des masses d'air).

Spanish

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Record 7 2002-03-19

English

Subject field(s)
  • Surveillance, Detection and Reconnaissance (Military)
DEF

The tone contrast difference of infrared linescan imagery which is caused by a thermal gradient which persists as a result of a shadow of an object which has been moved.

OBS

thermal shadow: term and definition standardized by NATO.

French

Domaine(s)
  • Surveillance, détection et reconnaissance (Militaire)
DEF

Différence de contraste de l'analyseur infrarouge à balayage provoquée par un gradient thermique qui persiste du fait de l'ombre d'un objet que l'on a déplacé.

OBS

ombre thermique : terme et définition normalisés par l'OTAN.

Spanish

Campo(s) temático(s)
  • Vigilancia, detección y reconocimiento (Militar)
DEF

Diferencia de contraste del analizador de infrarrojos de barrido provocados por el gradiente térmico que persiste como consecuencia de un objeto que ha sido movido.

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Record 8 2002-01-29

English

Subject field(s)
  • Remote Sensing
  • Electromagnetic Radiation
  • Military Equipment
CONT

... the [hand-held thermal imager] shows a black and white TV-like silhouette of a person up to 500 meters away. The uncovered parts of a person's face and hands produce high contrast in the standard TV image and appear bright. Clothing(with less heat) is darker, a tie is much cooler and therefore darkest. In addition to a 500 meter range for people, it can see vehicles out to 1, 500 meters.

Key term(s)
  • hand held thermal imager

French

Domaine(s)
  • Télédétection
  • Rayonnements électromagnétiques
  • Matériel militaire
OBS

système d'imagerie thermique portatif : Source : Revue nationale de défense nº 6/1984.

Spanish

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Record 9 1995-04-20

English

Subject field(s)
  • Calorimetry
  • Thermoanalysis
CONT

Remote heat sensing techniques evolved from space technology developments related to weather satellites can be used to detect comparative heat energy losses from roofs, walls, windows, and so on. A method called thermography is defined as the conversion of a temperature pattern detected on a surface by contrast into an image called a thermogram... Thermovision is defined as the technique of utilizing the infrared radiation from a surface which varies with the surface temperatures, to produce a thermal picture or thermogram. A camera can scan the area in question and focus the radiation on a sensitive detector which in turn converts it to an electronic signal.

OBS

Thermovision is reported as a registered trade name in the Trade Names Dictionary (CRNAM, 1982, volume 2, p.1060).

French

Domaine(s)
  • Calorimétrie
  • Thermo-analyse
DEF

Ensemble des techniques permettant de visualiser l'image thermique d'un objet.

Spanish

Campo(s) temático(s)
  • Calorimetría
  • Termoanálisis
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Record 10 1994-03-04

English

Subject field(s)
  • Sea Operations (Military)
  • Combat Systems (Naval Forces)
  • Electronic Warfare
CONT

The Sadral by contrast is an automated system weighing 1650 kilograms, with a below-deck console and a six-round stabilized launcher fitted with television and thermal imaging cameras; target designation is via a shipborne radar or electrooptics.

French

Domaine(s)
  • Opérations en mer (Militaire)
  • Systèmes de combat (Forces navales)
  • Guerre électronique
CONT

Plus complexe et plus lourd (1650 kg) le Sadral est une rampe sextuple stabilisée dotée de caméras à infrarouges et de télévision.

Spanish

Save record 10

Record 11 1993-06-01

English

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

Up until now the envelope equations have been written for a laterally unbounded system. The presence of side boundaries that confine the system can modify the instability mechanism. For example, in convection, viscous friction at a lateral wall increases the damping, which inhibits the instability. By contrast, a thermal perturbation in the wall or simply a difference of thermal conductivity between the fluid and the wall, can build up a horizontal temperature gradient that may induce a fluid motion, thus encouraging the instability. In both cases, we expect lateral boundary effects to impose modulations and act as boundary conditions on the envelope.

French

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

Effets de bords. Jusqu'à présent, les équations d'enveloppe ont été écrites et leurs propriétés analysées pour un système latéralement illimité. La présence de bords confinant celui-ci peut modifier le mécanisme d'instabilité. En convection par exemple, la friction visqueuse sur une paroi latérale contribue à l'amortissement, ce qui inhibe l'instabilité. Au contraire, une perturbation thermique dans la paroi ou simplement une différence de conductivité thermique entre fluide et paroi latérale peuvent provoquer l'apparition d'un gradient de température horizontal qui induit le mouvement et donc encourage l'instabilité. Dans les deux cas, on peut s'attendre à ce que les effets de paroi latérale imposent des modulations et agissent comme des conditions aux limites sur l'enveloppe.

Spanish

Save record 11

Record 12 1988-04-14

English

Subject field(s)
  • Atmospheric Physics
  • Environmental Studies and Analyses
CONT

The strongest thermal contrast develops in light-wind situations. Under such conditions, a convective circulation... develops. Subsiding air in areas bordering on the city strengthens the nocturnal surface-based inversion.

French

Domaine(s)
  • Physique de l'atmosphère
  • Études et analyses environnementales

Spanish

Save record 12

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