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CORRELATION FIELD [4 records]

Record 1 2021-07-29

English

Subject field(s)
  • Optics
  • Computer Graphics
  • Photography
CONT

… optical correlation analysis is based on the all-optical performance of the inner product(U|T) relation between the unknown field U and a designed transmission function T, realized by the holographic correlation filter …

French

Domaine(s)
  • Optique
  • Infographie
  • Photographie

Spanish

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Record 2 2016-02-29

English

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

McRae and Rutledge... described a kneading compactor developed at Northwestern University in which the load on the foot and the time the foot is in contact with the soil can be controlled. By varying these two features, the line-of-optimums can be shifted toward either higher or lower moisture contents to achieve better correlation with field compaction curves.

French

Domaine(s)
  • Mécanique des sols
  • Essais du sol (Construction)
  • Construction des voies de circulation
CONT

La ligne joignant les sommets des courbes densité-teneur en eau, qui prend l'allure générale de la courbe de saturation, est appelée «ligne des optimums».

Spanish

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Record 3 2011-06-15

English

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

The Bellani plate [used to measure evaporation] consists of a thin, porous, black ceramic disk, 7.5 cm in diameter, fused to the large end of a glazed, ceramic funnel. Water is conducted through the lower open end of the funnel from a burette which acts as a reservoir and a measuring device.

CONT

Use of Bellani plate evaporimeters for estimation of PET [potential evapotranspiration].

OBS

Evaporimeter(atmometer) An evaporimeter consists of a flat, porous ceramic disk(Bellani plate) in which water is drawn up by capillary action as water is evaporated from the disk. It is used to directly estimate crop evapotranspiration rate. Several commercial models can be easily installed near the edge of a field or on a roadway in a field.(The unit must be located far enough into the field to avoid field boundary effects.) One commercial model provides a green canvas-like material covering the ceramic disc to simulate crop leaf color. Reasonably good correlation has been found between field measurements and that calculated from Penman-type equations. Small difference in evaporation rates may be found between individual meters. Maintaining water levels and removal for freeze protection are necessary.

Key term(s)
  • Bellani plate evaporometer
  • Bellani evaporimeter
  • Bellani evaporometer
  • Bellani plate evaporometre
  • Bellani plate evaporimetre
  • Bellani evaporimetre
  • Bellani evaporometre
  • Bellani atmometre
  • Bellani atmidometer
  • Bellani atmidometre
  • Bellani plate atmometre

French

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

Appareil de mesure de l'eau évaporée, dont le capteur est un disque de porcelaine noircie, d'environ 7,5 centimètres de diamètre et quelques millimètres d'épaisseur, placé horizontalement au sommet d'une cheminée en verre alimentée en eau, sous pression, par un réservoir gradué qui permet la mesure de l'évaporation.

CONT

Il est très difficile de mesurer l'évaporation dans la nature, ou plus exactement l'évapotranspiration, puisqu'il faut tenir compte de la transpiration des plantes. [...] Suivant les pays et les besoins, la mesure est faite avec des dispositifs différents. Citons le bac à évaporation du bureau météorologique des États-Unis [...] le lysimètre, [...] l'évaporomètre Piche, employé en France surtout, [...]; enfin l'atmomètre de Bellani, utilisé dans les stations agricoles du Canada, petite assiette poreuse noire, maintenue humide et placée à quatre pieds au-dessus du sol.

CONT

La plaque de Bellani [utilisée pour mesurer l'évaporation] consiste en un disque de céramique [...] qui est joint à la grande ouverture d'un entonnoir de céramique vitrifié. L'eau est amenée à l'ouverture inférieur de l'entonnoir au moyen d'une burette qui sert en même temps de réservoir et d'appareil de mesure.

Spanish

Save record 3

Record 4 2009-11-17

English

Subject field(s)
  • Analytical Chemistry
  • Atomic Physics
  • Electromagnetic Radiation
  • Radiological Physics (Theory and Application)
DEF

[A gamma spectrometry method used] to determine the isotopic composition of plutonium [or uranium] samples without external efficiency calibration.

OBS

Its major drawback arises from the fact that Pu-242 does not show useful gamma rays. This isotope abundance has therefore to be estimated using isotope correlation techniques. However, it is a non destructive technique which has proven its capability in field application as well as under laboratory conditions.

Key term(s)
  • multiple-group analysis

French

Domaine(s)
  • Chimie analytique
  • Physique atomique
  • Rayonnements électromagnétiques
  • Physique radiologique et applications
CONT

Les applications principales de la spectrométrie gamma concernent l'estimation de compositions isotopiques (uranium et plutonium) et le domaine de la caractérisation radiologique d'objets irradiants. Elles peuvent se répertorier comme suit [...] - l'analyse de groupes multiples c'est-à-dire composés de plusieurs raies énergétiques voisines. Cette application ne nécessite pas d'étalonnage préalable. Elle utilise des données physiques des isotopes concernés et des algorithmes de déconvolution spectrale pour extraire le maximum d'informations du seul spectre; celui de l'échantillon inconnu.

Spanish

Save record 4

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