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YIELD RADIATION [6 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2016-01-21

English

Subject field(s)
  • Plant and Crop Production
  • Energy (Physics)
  • Scientific Measurements and Analyses
DEF

The maximum yield that can be achieved by a given crop cultivar in a given area, based on radiation and temperature.

French

Domaine(s)
  • Cultures (Agriculture)
  • Énergie (Physique)
  • Mesures et analyse (Sciences)
DEF

Rendement maximum qui peut être obtenu par un cultivar donné dans une aire donnée et basé sur la radiation et la température.

Spanish

Campo(s) temático(s)
  • Producción vegetal
  • Energía (Física)
  • Medición y análisis (Ciencias)
DEF

Rendimiento máximo que puede ser alcanzado por una variedad de un cultivo determinado en un área especifica, en función de la radiación y temperatura.

Save record 1

Record 2 2015-09-08

English

Subject field(s)
  • Atomic Physics
DEF

An area which, when multiplied by the power flux density of the incident wave, would yield sufficient power that could produce by isotropic radiation the same radiation intensity as that in a given direction from the scattering object.

OBS

scattering cross section: term and definition standardized by ISO.

French

Domaine(s)
  • Physique atomique
OBS

section efficace de diffusion : terme normalisé par l'ISO.

Spanish

Campo(s) temático(s)
  • Física atómica
DEF

Área que intercepta una cantidad de potencia acústica de una onda progresiva plana igual a la dispersada en todas direcciones por el objeto o por los dispersores en el volumen establecido.

OBS

De un objeto o volumen.

Save record 2

Record 3 - external organization data 2011-04-06

English

Subject field(s)
  • Chemistry
  • Geochemistry
  • Nuclear Physics
  • Compartment - Canadian Nuclear Safety Commission
DEF

Radioactive strontium of mass number 90; half-life, 28 years; radiation, beta; and radiotoxicity, very hazardous. In fallout, this isotope, a member of the mass 90 fission product chain which is produced in high yield from fission, is the longest lived member of that chain and consequently is itself produced in high yield.

OBS

Symbol: 90Sr. The number 90 is a superscript.

OBS

The isotope 90 is not the only radioactive isotope of strontium. Consequently, the term "radiostrontium" is correct but it has a more generic sense.

Key term(s)
  • radioactive strontium

French

Domaine(s)
  • Chimie
  • Géochimie
  • Physique nucléaire
  • Tiroir - Commission canadienne de sûreté nucléaire
DEF

Radioélément de période d'une durée de 28,5 ans.

CONT

Le strontium est un ostéotrope; plus de 99 % du strontium retenu dans l'organisme se trouve dans le squelette. Sa période biologique dans l'os est de l'ordre de 5 000 à 6 000 jours. Les isotopes radioactifs du strontium, strontium 89 (TR 50,5 jours) et strontium 90 (TR 28 ans), avec son descendant à vie courte l'yttrium 90, tous émetteurs ß, entraîneront donc essentiellement une irradiation des cellules qui tapissent la surface des os ainsi qu'une irradiation de la moelle osseuse rouge.

OBS

Symbole : 90Sr. Le chiffre 90 est en exposant.

Spanish

Campo(s) temático(s)
  • Química
  • Geoquímica
  • Física nuclear
  • Compartimiento - Comisión Canadiense de Seguridad Nuclear
OBS

Isótopo del estroncio radiactivo. Período de semidesintegración, 28 años. Radiación beta. Veneno radiactivo muy tóxico que aparece en la lluvia radiactiva originada por las explosiones nucleares.

OBS

90Sr.

Save record 3

Record 4 2007-07-12

English

Subject field(s)
  • Telecommunications Transmission
CONT

A dipole feed for a paraboloidal reflector antenna uses a conical reflector to direct the radiation of the dipole towards the concave reflecting surface of the parabola. The size and apex angle of the conical reflector are optimized to yield the desired feed pattern, the optimization parameters depending on the reflector size and focal length and being obtained numerically or experimentally to maximize reflector gain.

French

Domaine(s)
  • Transmission (Télécommunications)
CONT

On compare différentes définitions pour le rendement des pertes de polarisation des réflecteurs de type Cassegrain et des réflecteurs à alimentation frontale. On examine les effets de l'angle d'ouverture, de la conicité de l'alimentation, et de l'asymétrie du diagramme d'alimentation sur le rendement ci-dessus.

Spanish

Save record 4

Record 5 1987-01-19

English

Subject field(s)
  • Aeroindustry
  • Measuring Instruments
  • Lasers and Masers
CONT

The laser(or lidar) velocimeter [lidar=light radar] operates in a fashion entirely analogous to that of the airborne Doppler weather radars likely soon to be available for detecting turbulence in storm cells. As with radars, the device detects air movements by observing the motion of particles suspended in the air and carried with it. The only significant difference is that a beam of coherent infrared radiation is used to scan ahead of the aircraft, instead of a beam(or series of pulses) of radio energy in the considerably longer-wavelength microwave band. The frequency of the back-scattered echoes or reflections undergoes Doppler shift detection by standard heterodyning techniques, which involve comparing the frequency of the reflected illumination with that of the original laser beam. Any reflecting object or material which has motion relative to the transmitter/receiver will cause a detectable shift in frequency, which can be isolated from the transmitter's own proper motion(over the ground) and thus yield a precise indication of the speed at which the air is moving several hundred metres in front of the aircraft. From this data, it is easy to compute what the air speed of the aircraft will be when it reaches that particular patch of air in a few seconds’ time [and hence detect possible turbulence ahead].

French

Domaine(s)
  • Constructions aéronautiques
  • Appareils de mesure
  • Masers et lasers
CONT

Le principe de fonctionnement du vélocimètre à laser (ou lidar) est exactement le même que celui des radars météorologiques Doppler de bord, qui doivent être mis en service prochainement pour la détection des turbulences dans les systèmes d'orages.

Spanish

Save record 5

Record 6 1985-01-02

English

Subject field(s)
  • Aeroindustry
  • Radar, Radio Guidance and Goniometry
CONT

Detection relies entirely on echoes returned by the main rotor blades which do yield a significant Doppler effect. Experience has shown that rotor blades, whether metal or plastic, behave like mirrors in terms of reflecting electromagnetic radiation. In other words, a blade will only give a usable return to the transmitter location if it is perpendicular to line connecting blade and transmitter. At the receiver, a series of return pulses can be detected, each corresponding to the passage of a blade. By analogy with the illumination of a rotating mirror, this pulsed return pattern is known as "blade flash".

French

Domaine(s)
  • Constructions aéronautiques
  • Radar, radioguidage et radiogoniométrie
CONT

La détection repose entièrement sur les échos renvoyés par les pales du rotor principal qui, eux, présentent un effet Doppler important. L'expérience a montré que les pales, métalliques ou plastiques, se comportent vis-à-vis du rayonnement électromagnétique comme des miroirs. En d'autres termes, elles ne réfléchissent l'émission radar que si elles sont perpendiculaires à celle-ci. A la réception, on enregistre donc une série de retours de caractères impulsionnels, chacun correspondant au passage d'une pale. Par analogie avec l'illumination d'un miroir tournant, on appelle "éclairs de pale" ces retours impulsionnels.

Spanish

Save record 6

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