TERMIUM Plus^®

Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 CONT

A necessary condition for the convergence of a finite difference method for a hyperbolic [partial differential equation] is that the numerical domain of dependence contains the mathematical domain of dependence. This requirement is known as the Courant-Friedrichs-Levy or CFL condition, named after the authors who first described this requirement.  5, record 1, English, - Courant%2DFriedrichs%2DLewy%20condition

Record 1,  Textual support,  French

Record 1,  Textual support,  Spanish

Record number: 1, Textual support number: 1 DEF

Efecto especial de la inestabilidad de cálculo (error de los cálculos numéricos aproximados que aumenta rápidamente al avanzar el cálculo) asociado a la predicción meteorológica numérica. Si el tamaño de la rejilla es inferior a la distancia recorrida en el intervalo de paso de tiempo por la onda más rápida que permita la ecuación, los errores aumentarán y deteriorarán la solución física.  1, record 1, Spanish, - condici%C3%B3n%20C%2DF%2DL

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 OBS

In neutron transport theory, a method of analysis of the transport equation whereby the integral term describing scattering is replaced by a formula of numerical integration.  1, record 2, English, - Wick%2DChandrasekhar%20method

Record 2,  Textual support,  French

Record 2,  Textual support,  Spanish

Record 3,  Textual support,  English

Record number: 3, Textual support number: 1 DEF

An equation in which letter symbols represent the numerical values corresponding to the units of measurement used.  1, record 3, English, - equation%20between%20numerical%20values

Record number: 3, Textual support number: 1 OBS

1. An equation between numerical values, for the units of a coherent system of units, can also be considered as an equation between quantities. 2. In order to eliminate misunderstandings it is undesirable to use different symbols in equation between numerical values from those used in equations between quantities.  1, record 3, English, - equation%20between%20numerical%20values

Record 3,  Textual support,  French

Record number: 3, Textual support number: 1 DEF

Équation dans laquelle les symboles littéraux représentent des valeurs numériques correspondant aux unités de mesure utilisées.  1, record 3, French, - %C3%A9quation%20entre%20valeurs%20num%C3%A9riques

Record number: 3, Textual support number: 1 OBS

1. L'équation entre valeurs numériques, pour les unités d'un système cohérent d'unités de mesure, peut être considérée aussi comme une équation entre grandeurs. 2. Pour éliminer des malentendus, il serait désirable d'utiliser dans les équations entre valeurs numériques des symboles différents de ceux utilisés dans les équations entre grandeurs.  1, record 3, French, - %C3%A9quation%20entre%20valeurs%20num%C3%A9riques

Record number: 3, Textual support number: 2 OBS

équation entre valeurs numériques : recommandation the Internationale de la Troisième Conférence the Internationale de Métrologie Légale, 1968.  2, record 3, French, - %C3%A9quation%20entre%20valeurs%20num%C3%A9riques

Record 3,  Textual support,  Spanish

Record 4,  Textual support,  English

Record number: 4, Textual support number: 1 DEF

A numerical method for solving the transport equation by dividing the solid angle into N segments and approximating the differential particle flux density by a linear combination of its values in certain directions.  1, record 4, English, - Carlson%20SN%20method

Record number: 4, Textual support number: 1 OBS

Carlson SN method: Carlson S[subscript]N method; SN method: S[subscript]N method.  2, record 4, English, - Carlson%20SN%20method

Record number: 4, Textual support number: 2 OBS

Carlson SN method; SN method: terms and definition standardized by ISO.  2, record 4, English, - Carlson%20SN%20method

Record 4,  Textual support,  French

Record number: 4, Textual support number: 1 DEF

Méthode numérique de résolution de l'équation du transport, consistant à diviser l'angle solide en N parties et à déterminer par approximation le débit de fluence différentiel au moyen d'une combinaison linéaire de ses valeurs dans certaines directions.  1, record 4, French, - m%C3%A9thode%20SN%20de%20Carlson

Record number: 4, Textual support number: 1 OBS

méthode SN de Carlson : méthode S[indice]N de Carlson; méthode SN = méthode S[indice]N.  2, record 4, French, - m%C3%A9thode%20SN%20de%20Carlson

Record number: 4, Textual support number: 2 OBS

méthode SN de Carlson; méthode SN : termes et définition normalisés par l'ISO.  2, record 4, French, - m%C3%A9thode%20SN%20de%20Carlson

Record 4,  Textual support,  Spanish

Record 5,  Textual support,  English

Record number: 5, Textual support number: 1 DEF

A solution found by evaluating functions and solving equations.  4, record 5, English, - analytical%20solution

Record number: 5, Textual support number: 1 CONT

An analytical solution is one that can be explicitly written down, also called a closed form solution. Analytical solutions can not be found for many partial differential and ordinary differential equations(most in fact). In the case when an analytical solution has not been found yet, numerical methods may be applied to get an approximate solution. For instance a well known equation with an analytical solution is the wave equation. On the other hand, a well known equation that doesn’t have an analytical solution is the Navier-Stokes equation.  3, record 5, English, - analytical%20solution

Record number: 5, Textual support number: 1 OBS

In physics and engineering the usual terminology is "analytical solution," [instead of the term "closed-form expression," used in mathematics].  4, record 5, English, - analytical%20solution

Record number: 5, Textual support number: 2 OBS

analytical solution: term used at Natural Resources Canada - Earth Sciences Sector.  5, record 5, English, - analytical%20solution

Record 5,  Textual support,  French

Record number: 5, Textual support number: 1 OBS

solution analytique : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.  2, record 5, French, - solution%20analytique

Record 5,  Textual support,  Spanish

Record 6,  Textual support,  English

Record number: 6, Textual support number: 1 CONT

Integral transport methods. The integral transport methods construct an expression for the angular flux at a given location by integrating over all external and scattering sources that could contribute, taking in account the probability of the source neutral reaching the given location without a collision. The collision probability method result from partitioning the domain of the problem into a large number of finite size regions and formulating the equation to calculate the average value of the neutral flux in each region. Like the Monte Carlo method, the result of collision probability method can be very accurate. This method has been successfully implemented for neutral propagating in 3D rectangular grids. Since the collision probability method is based on a global particle balance, the neutral flux at a given region is coupled to the neutral scalar flux of any other regions via collision probabilities which must be calculated by multi-dimensional numerical integration involving expensive evaluation of Bickley functions.  3, record 6, English, - collision%20probability%20method

Record 6,  Textual support,  French

Record number: 6, Textual support number: 1 CONT

Dans la méthode de résolution par probabilité de collision, on découpe l’espace en éléments de volumes V_i, que l’on va considérer comme homogènes, et l’on calcule les facteurs de probabilité de collision qui représentent la probabilité qu’un neutronémis dans le volume V_i subisse sa première interaction dans le volume V_j. On entend par neutron émis dans V_i tout neutron qui y a été créé ou dont les caractéristiques (énergie, direction) y ont été modifiées suite à une diffusion ou à une autre interaction.  1, record 6, French, - m%C3%A9thode%20de%20r%C3%A9solution%20par%20probabilit%C3%A9%20de%20collision

Record 6,  Textual support,  Spanish

Record 7,  Textual support,  English

Record number: 7, Textual support number: 1 DEF

The number of molecules (or atoms) reacting per unit time. It has been explained by a combination of two theoretical models, the so-called collision theory and the transition state theory.... The collision theory provides a qualitative description of the factors that affect rate and proposes that reactions occur as a result of collisions between the reacting species.... The transition state theory expands upon the collision theory by proposing that an unstable transition state, or activated complex, is formed when reactants collide with the proper orientation and with a collision energy at least equal to the activation energy.  1, record 7, English, - reaction%20rate

Record number: 7, Textual support number: 1 OBS

An important numerical relationship emerges from the Michaelis-Menten equation in the special case when the initial reaction rate is exactly one-half the maximum velocity : we find that the substrate concentration is then equal to the enzyme's Km.  2, record 7, English, - reaction%20rate

Record 7,  Textual support,  French

Record number: 7, Textual support number: 1 CONT

Du fait de leur pouvoir catalytique, les enzymes sont capables de faire s'opérer, à 37°C et dans l'eau (seules conditions compatibles avec la vie), des réactions chimiques qui pourraient parfois se faire en laboratoire, mais dans des conditions beaucoup plus rigoureuses de température et de pression et souvent dans des solvants non aqueux. Les enzymes provoquent ainsi des accélérations considérables des vitesses de réaction : lorsqu'elle est catalysée par l'uréase du haricot rouge, la réaction d'hydrolyse de l'urée se produit 10¹⁴fois plus vite que lors d'une hydrolyse chimique classique à la même température.  1, record 7, French, - vitesse%20de%20r%C3%A9action

Record 7,  Textual support,  Spanish

Record 8,  Textual support,  English

Record number: 8, Textual support number: 1 DEF

Representation of the climate system based on the mathematical equation governing the behaviour of the various components of the system and including treatments of key physical processes and interactions, cast in a form suitable for numerical approximation(generally now making use of electronic computers).  1, record 8, English, - climate%20model

Record 8,  Textual support,  French

Record number: 8, Textual support number: 1 DEF

Représentation du système climatique fondé sur les équations mathématiques traduisant le comportement des diverses composantes du système et tenant compte des principaux processus physiques et interactions, sous une forme qui se prête à une approximation numérique (comportant généralement à l'heure actuelle l'utilisation de calculateurs électroniques).  1, record 8, French, - mod%C3%A8le%20de%20climat

Record 8,  Textual support,  Spanish

Record number: 8, Textual support number: 1 DEF

Representación del sistema climático basada en ecuaciones matemáticas que rigen el comportamiento de los distintos componentes del sistema y que incluyen los principales procesos físicos e interacciones en forma apropiada para la aproximación numérica (en general utilizando actualmente computadoras electrónicas).  1, record 8, Spanish, - modelo%20clim%C3%A1tico

Record 9,  Textual support,  English

Record number: 9, Textual support number: 1 DEF

Diagnostic equation from which the vertical velocity in pressure coordinates(w=dp/dt) may be calculated by a numerical relaxation method.  2, record 9, English, - omega%20equation

Record 9,  Textual support,  French

Record number: 9, Textual support number: 1 DEF

Équation diagnostique par laquelle la vitesse verticale en coordonnées pression (w = dp/dt) peut être calculée par une méthode de relaxation numérique.  2, record 9, French, - %C3%A9quation%20om%C3%A9ga

Record 9,  Textual support,  Spanish

Record number: 9, Textual support number: 1 DEF

Ecuación de diagnóstico en la que la velocidad vertical en coordenadas de presión (w = dp/dt) puede calcularse con un método de relajación numérica.  1, record 9, Spanish, - ecuaci%C3%B3n%20omega

Record 10,  Textual support,  English

Record number: 10, Textual support number: 1 DEF

Substitution of an initial wind field computed from the balance equation and stream function in place of the observed winds, for use as initial data in numerical prediction models based on the primitive equations.  1, record 10, English, - dynamic%20initialization

Record number: 10, Textual support number: 1 OBS

Use of the computed field avoids spurious initial accelerations and divergences which arise from inaccuracies in the observed wind data.  1, record 10, English, - dynamic%20initialization

Record 10,  Textual support,  French

Record number: 10, Textual support number: 1 DEF

Dans les modèles de prévision numérique basés sur les équations primitives, substitution aux vents observés d'un champ de vent initial calculé à partir de l'équation d'équilibre et de la fonction de courant.  1, record 10, French, - initialisation%20dynamique

Record number: 10, Textual support number: 1 OBS

L'utilisation d'un champ calculé évite les accélérations et divergences initiales fausses qui proviennent d'inexactitudes dans les données sur les vents observés.  1, record 10, French, - initialisation%20dynamique

Record 10,  Textual support,  Spanish

Record number: 10, Textual support number: 1 DEF

En los modelos de predicción numérica basados en ecuaciones primitivas, sustitución de los vientos observados por un campo de viento inicial calculado a partir de la ecuación de equilibrio y de la función de corriente.  1, record 10, Spanish, - inicializaci%C3%B3n%20din%C3%A1mica

Record number: 10, Textual support number: 1 OBS

La utilización del campo calculado evita las aceleraciones y divergencias iniciales falsas que proceden de inexactitudes en los datos de los vientos observados.  1, record 10, Spanish, - inicializaci%C3%B3n%20din%C3%A1mica

Record 11,  Textual support,  English

Record number: 11, Textual support number: 1 DEF

Equation for the rate of change of horizontal divergence on a parcel.  2, record 11, English, - divergence%20equation

Record number: 11, Textual support number: 1 OBS

It is obtained by taking the divergence of the vector equation of motion. For the purposes of dynamical analysis and numerical weather prediction it is often advantageous to replace the vector equation of horizontal motion by a scalar equation. A similar procedure, using the vertical component of the vorticity operator instead, results in the vorticity equation.  2, record 11, English, - divergence%20equation

Record 11,  Textual support,  French

Record number: 11, Textual support number: 1 DEF

Équation qui permet de trouver le taux de variation horizontale de la divergence sur une particule.  2, record 11, French, - %C3%A9quation%20de%20divergence

Record number: 11, Textual support number: 1 OBS

On l'obtient en calculant la divergence des termes de l'équation vectorielle du mouvement. Aux fins de l'analyse dynamique et de la prévision météorologique numérique, il est souvent utile de remplacer l'équation vectorielle du mouvement horizontal par une équation scalaire. Par une méthode semblable, c.-à-d. en utilisant la composante verticale de l'opérateur du tourbillon, on obtient l'équation du tourbillon.  2, record 11, French, - %C3%A9quation%20de%20divergence

Record 11,  Textual support,  Spanish

Record number: 11, Textual support number: 1 DEF

Ecuación aplicable a la tasa de variación horizontal de la divergencia en una partícula.  1, record 11, Spanish, - ecuaci%C3%B3n%20de%20divergencia

Record number: 11, Textual support number: 1 OBS

Se obtiene calculando la divergencia en la ecuación vectorial del movimiento. Para los fines del análisis dinámico y de la predicción meteorológica numérica es a menudo ventajoso remplazar la ecuación vectorial del movimiento horizontal por una ecuación escalar. Un procedimiento análogo, que utiliza el componente vertical de la ecuación de vorticidad, da lugar a la ecuación de vorticidad.  1, record 11, Spanish, - ecuaci%C3%B3n%20de%20divergencia

Record 12,  Textual support,  English

Record number: 12, Textual support number: 1 CONT

To calculate the harmonic measure and its characteristic properties one can follow two numerical methods. i) After having generated a DLA cluster one releases further particles... whose diffusional motion is simulated by the same technique... which is used for growing the aggregate.... ii) solving the Laplace equation... with boundary conditions.... For small clusters the Green's function method can be used to solve Laplace's equation... yielding GSPD free of any effects....  2, record 12, English, - Green%27s%20function%20method

Record 12,  Textual support,  French

Record number: 12, Textual support number: 1 DEF

Méthode de simulation numérique de la croissance d'un agrégat limité par diffusion, par résolution d'équations laplaciennes.  1, record 12, French, - m%C3%A9thode%20de%20Green

Record 12,  Textual support,  Spanish

Record 13,  Textual support,  English

Record number: 13, Textual support number: 1 DEF

Diagnostic equation which establishes the relationship between the geopotential field and the horizontal field of motion.  2, record 13, English, - balance%20equation

Record number: 13, Textual support number: 1 OBS

Velocities obtained by solving this equation may be used as initial data in numerical weather prediction or in diagnostic studies.  2, record 13, English, - balance%20equation

Record 13,  Textual support,  French

Record number: 13, Textual support number: 1 DEF

Équation diagnostique exprimant la relation entre les champs de géopotentiel et de mouvement horizontal.  2, record 13, French, - %C3%A9quation%20d%27%C3%A9quilibre

Record number: 13, Textual support number: 1 OBS

Les vitesses obtenues en résolvant cette équation peuvent être utilisées comme données initiales en prévision numérique du temps ou en études diagnostiques.  2, record 13, French, - %C3%A9quation%20d%27%C3%A9quilibre

Record 13,  Textual support,  Spanish

Record number: 13, Textual support number: 1 DEF

Ecuación de diagnóstico que establece la relación entre el campo geopotencial y el campo horizontal de movimiento.  1, record 13, Spanish, - ecuaci%C3%B3n%20del%20balance

Record number: 13, Textual support number: 1 OBS

Las velocidades obtenidas resolviendo esta ecuación pueden usarse como valores iniciales en modelos de predicción numérica del tiempo o en estudios diagnósticos.  1, record 13, Spanish, - ecuaci%C3%B3n%20del%20balance

Record 14,  Textual support,  English

Record number: 14, Textual support number: 1 DEF

Relationship between a stimulus and the corresponding response, for defined conditions. Example: the e.m.f. (electromotive force) of a thermocouple as a function of temperature.  2, record 14, English, - response%20characteristic

Record number: 14, Textual support number: 1 OBS

1. The relationship may be expressed in the form of a mathematical equation, a numerical table or a graph. 2. When the stimulus varies as a function of time, one form of the response characteristic is the transfer function(the Laplace transform of the response divided by that of the stimulus).  2, record 14, English, - response%20characteristic

Record number: 14, Textual support number: 2 OBS

response characteristic: term and definition approved by ISO, the International Bureau of Weights and Measures (BIPM), the International Electrotechnical Commission (IEC), the International Organization of Legal Metrology (OIML), and others.  3, record 14, English, - response%20characteristic

Record 14,  Textual support,  French

Record number: 14, Textual support number: 1 DEF

Relation entre un signal d'entrée et la réponse correspondante, dans des conditions définies. Exemples : force électromotrice d'un thermocouple en fonction de la température.  2, record 14, French, - caract%C3%A9ristique%20de%20transfert

Record number: 14, Textual support number: 1 OBS

1. La relation peut s'exprimer sous forme d'une équation mathématique, d'une table numérique ou d'un graphe. 2. Lorsque le signal d'entrée varie en fonction du temps, la fonction de transfert (quotient de la transformée de Laplace du signal de sortie par la transformée de Laplace du signal d'entrée) est une forme de la caractéristique de transfert).  2, record 14, French, - caract%C3%A9ristique%20de%20transfert

Record number: 14, Textual support number: 2 OBS

caractéristique de transfert : terme normalisé par l'AFNOR.  3, record 14, French, - caract%C3%A9ristique%20de%20transfert

Record number: 14, Textual support number: 3 OBS

caractéristique de transfert : terme et définition entérinés, entre autres, par l'ISO, le Bureau international des poids et mesures (BIPM), par la Commission électrotechnique internationale (CEI) et par l'Organisation internationale de métrologie légale (OIML).  3, record 14, French, - caract%C3%A9ristique%20de%20transfert

Record 14,  Textual support,  Spanish

Record 15,  Textual support,  English

Record number: 15, Textual support number: 1 CONT

There are three general classes of numerical models... which can be used for wind prospecting-primitive equation models, simplified physics models, and objective analysis models.  1, record 15, English, - simplified%20physics%20model

Record 15,  Textual support,  French

Record 15,  Textual support,  Spanish

Record 16,  Textual support,  English

Record number: 16, Textual support number: 1 CONT

There are three general classes of numerical models... which can be used for wind prospecting-primitive equation models, simplified physics models, and objective analysis models.... Objective analysis models perform an interpolation of observed data consistent with constraints imposed by mass continuity and terrain slope.  1, record 16, English, - objective%20analysis%20model

Record 16,  Textual support,  French

Record 16,  Textual support,  Spanish