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REFLECTIVE POWER [4 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2014-10-30

English

Subject field(s)
  • Optics
CONT

From a remote outpost on the summit of Hawaii's dormant Mauna Kea volcano, astronomers at the W. M. Keck Observatory probe the deepest regions of the Universe with unprecedented power and precision. Their instruments are the twin Keck Telescopes, the world's largest optical and infrared telescopes. Each stands eight stories tall and weighs 300 tons, yet operates with nanometer precision. At the heart of each Keck Telescope is a revolutionary primary mirror. Ten meters in diameter, the mirror is composed of 36 hexagonal segments that work in concert as a single piece of reflective glass.

OBS

The twin telescopes, Keck I and Keck II respectively began science observations in May, 1993 and in October, 1996.

French

Domaine(s)
  • Optique
CONT

La conception du télescope de Keck marque une innovation importante : la surface réfléchissante de l'instrument est composée d'une mosaïque de trente-six miroirs hexagonaux, tous orientables individuellement grâce à trois vérins. Elle équivaut à un miroir primaire de 10 m de diamètre, sans en avoir le poids [...] Un second télescope - Keck II - doit être mis en service au sommet du Mauna Kea.

Spanish

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Record 2 2010-12-21

English

Subject field(s)
  • Atmospheric Physics
  • Astrophysics and Cosmography
DEF

... the fraction of the total incident solar radiation -the radiation at all wavelengths- that is reflected or scattered by an object in all directions ...

CONT

The Bond albedo is the total radiation reflected from an object compared to the total incident radiation from the Sun. The Bond albedo for the Earth is given as 0.29 by de Pater and Lissauer, compared to their value of 0.37 for the geometrical albedo.

OBS

Bond albedo: named for the American astronomer George Bond (1826-1865) ...

OBS

Bond albedo ... is an important measure of a planetary body’s energy balance.

OBS

albedo : A measure of the reflecting power of a nonluminous object, such as a planet, moon, or asteroid. Albedo(from the Latin "albus" for "white") is expressed as the fraction of light and/or other radiation falling on an object [or a surface] that is reflected or scattered back into space; its value ranges from 0, for a perfectly black surface, to 1, for a totally reflective surface.

OBS

Albedo is differentiated into two types, normal albedo and bond albedo.

French

Domaine(s)
  • Physique de l'atmosphère
  • Astrophysique et cosmographie
DEF

[...] rapport entre l'énergie radiante qui tombe sur une planète [un corps], et la totalité de l'énergie radiante réfléchie par la planète [ce corps].

CONT

Albédo de Bond (ou global, ou planétaire) - il caractérise la proportion de flux d'énergie réfléchie dans toutes les directions par un corps supposé sphérique et éclairé par un flux de rayons parallèles.

Spanish

Campo(s) temático(s)
  • Física de la atmósfera
  • Astrofísica y cosmografía
DEF

[...] fracción entre toda la energía reflejada por un cuerpo y la energía incidente.

Save record 2

Record 3 2007-01-31

English

Subject field(s)
  • Space Physics
DEF

In genegral, a measure of the efficiency of a radar target in intercepting and returning radio energy [;] it depends upon the size, shape, aspect, and dielectric properties of the target.

CONT

... some surfaces or objects will reflect much of the in-coming radiation while other surfaces will absorb most of the in-coming radiation. It is these differences in reflectivity that allow us to distinguish different features or conditions in remote sensing imagery. The reflectivity of a surface can be measured for a specific wavelength or for the entire electromagnetic spectrum.

OBS

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

French

Domaine(s)
  • Physique spatiale
DEF

Mesure de l'efficacité d'une cible à intercepter et à renvoyer un signal radar; cette réflectivité dépend de la taille, de la forme, de l'état de la surface et des propriétés diélectriques de la cible.

OBS

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

PHR

Coefficient complexe, signature angulaire de réflectivité.

Spanish

Campo(s) temático(s)
  • Física espacial
Save record 3

Record 4 1999-06-21

English

Subject field(s)
  • Audiovisual Techniques and Equipment
  • Cinematography
CONT

The beaded screen has a much greater reflective power than the matte screen, but the brightness is mainly concentrated along the projection axis and fades to an inadequate level beyond 40 ° from the axis.

CONT

To create a surface that’s glass beaded, a screen manufacturer has to find a way to apply a very large number of very small glass balls onto a substrate (a backing) which is thereafter going to get rolled up and down possibly thousands of times.

Key term(s)
  • glass-beaded projection screen

French

Domaine(s)
  • Audiovisuel (techniques et équipement)
  • Cinématographie
CONT

L'écran perlé [...] dont la surface est recouverte de minuscules billes de verre transparentes et incolores, se caractérise par un grand pouvoir réfléchissant. Il donne des images très lumineuses, mais, en contrepartie, ne renvoie la lumière que dans un angle limité à environ 30 ° seulement; pour cette raison, les spectateurs doivent se rassembler autour de l'axe de projection et ne pas trop s'écarter de celui-ci. L'écran perlé [...] est tout indiqué pour les projections réalisées dans des salles en longueur.

Spanish

Save record 4

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