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MATRIX ELEMENT [19 records]

Record 1 2025-04-30

English

Subject field(s)
  • Analytical Chemistry
CONT

Matrix effects can be divided into two kinds, physical and chemical. Physical matrix effects depend on the physical properties of the sample and generally relate to the ablation step of LIBS [laser-induced breakdown spectroscopy]. That is, differences between the specific heat, latent heat of vaporization, thermal conductivity, absorption, etc., of different matrices can change the amount of an element ablated from one matrix compared with another matrix even though the properties of the ablation laser pulse remain constant.

French

Domaine(s)
  • Chimie analytique
CONT

Les effets de matrice physiques sont liés aux propriétés physiques du matériau ablaté (température de vaporisation, absorbance à la longueur d'onde du laser utilisé...).

Spanish

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Record 2 2025-04-30

English

Subject field(s)
  • Analytical Chemistry
CONT

Chemical matrix effects occur when the presence of one element affects the emission characteristics of another element. This can complicate calibration of the technique and hence the ability to obtain quantitative results. These effects can be compensated for in the analysis if the concentration and effect of the interfering element(s) are known.... An example of a chemical matrix effect is the reduction in emission intensity of an ionized species... upon a significant increase in the concentration of an easily ionizable species in the matrix.

French

Domaine(s)
  • Chimie analytique
CONT

Les effets de matrice peuvent être divisés en deux catégories : les effets de matrice physiques et chimiques. [...] Les effets de matrice chimiques impliquent que pour une concentration donnée d'un élément, le signal émis par cet élément sera différent suivant la composition du reste de la matrice. La présence de certains éléments facilement ionisables par exemple peut affecter l'émission d'autres éléments [...]

Spanish

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Record 3 2015-04-24

English

Subject field(s)
  • Nuclear Physics
DEF

The weighted average cross-section, characteristic of the neutron energy groups, that accounts for the transfer of neutrons by scattering from one specified group to another.

OBS

It is one element of the corresponding group transfer scattering matrix.

OBS

group transfer scattering cross-section: term and definition standardized by ISO.

French

Domaine(s)
  • Physique nucléaire
DEF

Section efficace moyenne pondérée, caractéristique d'un groupe de neutrons (par énergie), rendant compte du transfert de neutrons par diffusion d'un groupe déterminé à un autre.

OBS

C'est l'un des éléments de la matrice correspondante de transfert par diffusion de groupe.

OBS

section efficace de transfert de groupe par diffusion : terme et définition normalisés par l'ISO.

Spanish

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Record 4 2013-06-25

English

Subject field(s)
  • Analytical Chemistry
  • Soil Science
DEF

pseudo-total concentration (for inorganics): The amount of an element determined using a strong acid or combination of acids as extractant.

OBS

Typically, a small insoluble proportion of the element under consideration is not removed from the matrix by the chosen extractants.

OBS

Depending on the element and the soil matrix, the pseudo-total concentration is typically 70% to 90% of the true total concentration.

OBS

pseudo-total concentration for inorganics: The term "pseudo-total concentration (for inorganics)" and the definition have been standardized by the International Organization for Standardization (ISO).

Key term(s)
  • pseudototal concentration for inorganics

French

Domaine(s)
  • Chimie analytique
  • Science du sol
DEF

concentration pseudo-totale (pour les matières inorganiques) : Quantité d'un élément déterminée au moyen d'un acide fort ou d'une combinaison d'acides agissant en qualité de solvant d'extraction.

OBS

Généralement, les solvants d'extraction choisis laissent dans la matrice une faible proportion insoluble de l'élément considéré.

OBS

La concentration pseudo-totale est généralement comprise, selon l'élément et la matrice du sol, entre 70 % et 90 % de la concentration totale réelle.

OBS

concentration pseudo-totale pour les matières inorganiques : Le terme «concentration pseudo-totale (pour les matières inorganiques)» et la définition ont été normalisés par l'Organisation internationale de normalisation (ISO).

Key term(s)
  • concentration pseudototale pour les matières inorganiques

Spanish

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Record 5 2012-02-17

English

Subject field(s)
  • Biochemistry
DEF

The supporting tissue or matrix of an organ, as distinguished from its functional element, or parenchyma.

French

Domaine(s)
  • Biochimie
DEF

Tissu de base, qui constitue la charnière d'un organe.

Spanish

Campo(s) temático(s)
  • Bioquímica
Save record 5

Record 6 - external organization data 2011-06-14

English

Subject field(s)
  • Compartment - ISO/IEC JTC 1 Information Technology Vocabulary
Universal entry(ies)
04.02.06 (19762)
ISO/IEC standard entry number
DEF

<matrix symbology> single cell or element used to encode one bit of the codeword

OBS

module; matrix symbology symbol: terms and definition standardized by ISO/IEC [ISO/IEC 19762-2:2008].

French

Spanish

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Record 7 2011-01-26

English

Subject field(s)
  • Mathematics
  • Econometrics
DEF

A matrix all of whose entries are zero.

CONT

A null matrix is a matrix in which every element of the matrix equals 0. It can be of any dimension. Addition and subtraction of a null matrix leaves the original matrix unchanged, multiplication with a null matrix results in another null matrix.

OBS

A zero matrix is sometimes called a trivial matrix. A matrix which has at least one nonzero entry is called a nontrivial matrix or nonzero matrix. (It is not required that all entries be nonzero, just that at least one of them is nonzero!)

OBS

zero matrix: term used at Natural Resources Canada - Earth Sciences Sector.

French

Domaine(s)
  • Mathématiques
  • Économétrie
DEF

Matrice dont tous les coefficients sont nuls.

OBS

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

Spanish

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Record 8 2011-01-07

English

Subject field(s)
  • Data Banks and Databases
OBS

matrix : An ordered, hierarchical arrangement of data elements(words or numbers), each element of which requires a number of identifiers equal to the number of dimensions in the matrix.

French

Domaine(s)
  • Banques et bases de données
OBS

Dont le déterminant est différent de zéro. C'est le contraire d'une matrice singulière.

Spanish

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Record 9 - external organization data 2009-08-04

English

Subject field(s)
  • Compartment - ISO/IEC JTC 1 Information Technology Vocabulary
Universal entry(ies)
02.02.01 (19762)
ISO/IEC standard entry number
DEF

set of rules used, in a bar code or matrix symbology, to convert the element pattern of a symbol to data characters

OBS

decode algorithm: term and definition standardized by ISO/IEC [ISO/IEC 19762-2:2008].

French

Spanish

Save record 9

Record 10 2009-03-01

English

Subject field(s)
  • Combustion and Fuels (Fireplaces)
  • Nuclear Fission Reactors
CONT

Fuel Element. MITR-II [Massachusetts Institute of Technology Reactor] fuel consists of fifteen fuel plates in a rhomboid-shaped element. Each fuel plate consists of fuel sandwiched between sides of aluminum cladding, which are finned to increase the heat transfer surface area in a reactor. The uranium fuel is in a uranium-aluminum matrix called cermet.

French

Domaine(s)
  • Combustion et combustibles (Foyers)
  • Réacteurs nucléaires de fission
DEF

Combustible nucléaire, notamment de l'uranium, emprisonné entre des gaines d'aluminium, qui sert à alimenter les réacteurs.

Spanish

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Record 11 2007-01-31

English

Subject field(s)
  • Remote Sensing
DEF

A technique used in image restoration, enhancement or coding [that is] a separable orthogonal transform or an expansion of the matrix in rank-1 matrices.

CONT

This paper presents a simple and effective method for matching two uncalibrated images. Corner points are firstly extracted as interest points in the two images. Each interest point is assigned one dominant orientation. The initial set of point matches is then obtained by singular value decomposition of a correspondence strength matrix. A new expression of this matrix is introduced to handle more complicated imaging conditions. Each element of this matrix is the similarity measure between two interest points. The new similarity measure is invariant to image rotation by taking into account the dominant orientation of the two interest points. The epipolar geometry constraint is finally imposed to reject the false matches. Experimental results on real images show this approach to be effective for general image matching.

OBS

single value decomposition; SVD: term and abbreviation officially approved by the RADARSAT-2 Terminology Approval Group (RTAG).

French

Domaine(s)
  • Télédétection
DEF

Technique puissante d'analyse et de traitement matriciel qui exhibe les propriétés géométriques de la matrice.

OBS

décomposition en valeurs singulières; DVS : terme et abréviation uniformisés par le Groupe de travail de la terminologie de RADARSAT-2 (GTTR).

Spanish

Campo(s) temático(s)
  • Teledetección
CONT

Por este motivo, se ha desarrollado un modelo estadístico de predicción, que tiene como núcleo la descomposición en valores singulares de una matriz. Esta técnica produce pares de patrones que explican la máxima covarianza entre dos campos.

Save record 11

Record 12 2006-07-07

English

Subject field(s)
  • Bioengineering
CONT

Three families of repetitive sequences have been studied in most detail, including the 35-40 bp [base pair] repetitive extragenic palindromic(REP) sequence, the 124-127 bp enterobacterial repetitive intergenic consensus(ERIC) sequence, and the 154 bp BOX element. These sequences appear to be located in distinct, intergenic positions all around the chromosome. The repetitive elements may be present in both orientations on the chromosome, and PCR [polymerase chain reaction] primers have been designed to "read outward" from the inverted repeats in REP and ERIC, and from the boxA subunit of BOX. The use of the above primer(s) and PCR leads to the selective amplification of distinct genomic regions located between REP, ERIC or BOX sequences. The corresponding protocols are referred to as REP-PCR, ERIC-PCR and BOX-PCR, respectively, and rep-PCR collectively. Amplified bands are size fractionated through a gel matrix to yield fingerprint patterns resembling "bar codes", analogous to UPC codes used in grocery stores, and function as a signature for specific bacterial strains.

French

Domaine(s)
  • Technique biologique
DEF

Technique d'amplification génique effectuée au moyen d'amorces de type BOX afin d'établir l'empreinte génétique d'un microorganisme.

OBS

L'utilisation de l'article semble rare. Par exemple, on parlerait plutôt «d'empreinte génétique par BOX-PCR» que «d'empreinte génétique par la BOX-PCR».

Spanish

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Record 13 2003-02-27

English

Subject field(s)
  • Information Processing (Informatics)
CONT

Since data items are kept sorted in the sequential data structure, changing a matrix element can require the movement of all the data items in the matrix.

French

Domaine(s)
  • Traitement de l'information (Informatique)

Spanish

Campo(s) temático(s)
  • Tratamiento de la información (Informática)
DEF

Estructura de datos en la que un elemento está inmediatamente contiguo al siguiente.

Save record 13

Record 14 2001-12-04

English

Subject field(s)
  • Geology
  • Geochemistry
DEF

The enhancement or suppression of minor element spectral lines from metallic oxides during emission spectroscopy by the matrix element(such as graphite) used to hold the sample.

French

Domaine(s)
  • Géologie
  • Géochimie
DEF

Phénomène perturbateur provenant de la composition chimique ou des paramètres physiques d'un échantillon de roche analysé à l'aide d'un spectromètre d'arc.

OBS

En géologie, la difficulté principale provient de la grande variété des matériaux étudiés qui rend particulièrement gênants les effets perturbateurs dit «effets de matrice». On rassemble sous cette appellation les divers phénomènes qui font que l'intensité d'une raie émise par un élément ne dépend pas seulement de l'abondance de ce dernier, mais aussi de la composition chimique et des paramètres physiques (granulométrie, conductibilité, volatilité etc. ...) de l'échantillon.

Spanish

Campo(s) temático(s)
  • Geología
  • Geoquímica
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Record 15 2001-02-08

English

Subject field(s)
  • Information Processing (Informatics)
  • Office Automation
CONT

In facsimile, the diode sensor array uses a stationary configuration of tiny photodiodes arranged in a matrix that equals in width one lateral scan line of a document. An original is rollerfed from a flatbed tray and passes by the sensor array one line at a time. Light is reflected from each line and focused through a lens onto the face of the photodiode array. Each diode acts as an independent photosensor in converting a small picture element into part of the total electrical signal for a scan line.

French

Domaine(s)
  • Traitement de l'information (Informatique)
  • Bureautique

Spanish

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Record 16 2000-07-19

English

Subject field(s)
  • Mathematics
  • Management Operations (General)
DEF

A solution to a game matrix which yields the optimum strategy for both persons(lowest element in the row is also the highest element in the column). If no saddle point exists the opponents must use a mixed strategy to obtain game value.

French

Domaine(s)
  • Mathématiques
  • Opérations de la gestion (Généralités)
CONT

Quand le minimax et le maximin coïncident, la matrice du jeu possède un point d'équilibre appelé point-selle.

CONT

Le cas où l'égalité a lieu entre minimax et maximin permet d'atteindre la notion de point-selle, appelé encore point d'équilibre ou col.

Spanish

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Record 17 1993-10-05

English

Subject field(s)
  • Acoustics (Physics)
DEF

The ratio of the applied excitation force phasor to the resulting velocity phasor with all other connection points of the system free, i. e. having zero restraining forces. Free impedance is the arithmetic reciprocal of a single element of the mobility matrix.

OBS

Historically, often no distinction has been made between blocked impedance and free impedance. Caution should, therefore, be exercised in interpreting published data. While experimentally determined free impedances could be assembled into a matrix, this matrix would be quite different from the blocked impedance matrix, resulting from mathematical modelling of the structure and, therefore, would not conform to the requirements for using mechanical impedance in a overall theoretical analysis of the system.

French

Domaine(s)
  • Acoustique (Physique)
DEF

Rapport du vecteur tournant de la force d'excitation au vecteur tournant de la vitesse résultante, tous les autres points de connexion du système étant libres, c'est-à-dire ayant des forces de contrainte nulle. L'impédance libre est l'inverse arithmétique d'un élément unique de la matrice de mobilité.

OBS

Par le passé, on a rarement fait la distinction entre impédance bloquée et impédance libre. Il faudrait donc faire attention lorsqu'on interprète les données publiées. Alors que les impédances libres déterminées expérimentalement pourraient être regroupées en une matrice, celle-ci serait tout à fait différente de la matrice d'impédance bloquée résultant de la modélisation mathématique de la structure et ne serait donc pas conforme aux exigences portant sur l'utilisation de l'impédance mécanique dans une analyse théorique globale du système.

Spanish

Save record 17

Record 18 1985-05-30

English

Subject field(s)
  • Air Pollution
CONT

... the contributions to the depositions or ambient concentrations at a series of receptor areas of interest from a series of specified source regions can be displayed conveniently in matrix form. This format of presentation is called a "transfer matrix" because each element of the matrix expresses, quantitatively, the physical relationship between a specified receptor area and a specified source area for the species and variable of interest. One can thus relate source to receptor, or "transfer" the effect of a change at source to the receptor.

French

Domaine(s)
  • Pollution de l'air

Spanish

Save record 18

Record 19 1977-06-07

English

Subject field(s)
  • Chemistry
CONT

Matrix interference or bulk interference is caused by either a change in viscosity of the solution or by a large excess of extraneous ions... the absorption of a given concentration of an element in organic solvents can be as much as four to five times higher than the aqueous solution of the same concentration aspirated into the flame. Many workers have also suggested matching the standards and samples with materials that are present in excess of 1 %.

French

Domaine(s)
  • Chimie
DEF

Ces interactions interviennent pour des concentrations en corps dissous supérieurs à 2 % et lorsque la viscosité est différente de celle des étalons. Elles entraînent un effet «scattering», une baisse du nombre d'atomes neutres produits par suite d'une diminution du débit d'aspiration et un encrassement des brûleurs avec risques d'explosion associés. Le moyen simple d'éviter ces interactions est de diluer les solutions ou d'utiliser des solvants organiques.

Spanish

Save record 19

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