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GREEN DISC [3 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 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 1

Record 2 2003-09-02

English

Subject field(s)
  • Sports Equipment and Accessories
  • Cycling
CONT

On tracks whose dimension does not allow for an exact number of complete laps to the kilometre, the first km covered shall be indicated by a red pennant for the rider who started from the red disc and by a green pennant for [the one] who started from the green disc. The last km shall be indicated by two red pennants and two green pennants respectively.

OBS

Rules/refereeing.

French

Domaine(s)
  • Équipement et accessoires de sport
  • Cyclisme
CONT

Sur les pistes dont la dimension ne permet pas un nombre de tours complets correspondant au kilométrage, le premier km parcouru sera indiqué par un fanion rouge pour le coureur parti au disque rouge et par un fanion vert pour coureur parti au disque vert. Le dernier km sera indiqué par deux fanions rouges et deux fanions verts respectivement.

OBS

Règlements/arbitrage.

Spanish

Campo(s) temático(s)
  • Equipo y accesorios deportivos
  • Ciclismo
Save record 2

Record 3 2001-02-02

English

Subject field(s)
  • Computer Graphics
DEF

A picture coding scheme used in CD-I for high-quality graphics. Images are encoded on disc as red, green, and blue components using five bits for each color, plus one overlay and control bit.

French

Domaine(s)
  • Infographie
OBS

rouge-vert-bleu; RVB : Système d'affichage utilisant les signaux rouge, vert et bleu. Ce type de signal donne une image de qualité supérieure aux RF (Fréquences radioélectriques).

OBS

direct absolu.

Spanish

Save record 3

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