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POSITIONING ROD [4 records]

Record 1 2017-04-13

English

Subject field(s)
  • Nuclear Power Stations
CONT

A burnable poison rod for use in a nuclear reactor comprises a metallic tube with upper and lower closure means, a neutron absorber positioned within the cladding, and a neutron moderating spacer means positioning the neutron absorber in spaced relation to the lower closure means. The neutron moderating spacing means can comprise a solid neutron moderating material, or a liquid coolant moderator contained within the lower section of the cladding with a sealing plug positioned between the neutron absorber and the liquid coolant moderator.

French

Domaine(s)
  • Centrales nucléaires
CONT

On peut signaler la détection, en juillet 1979 lors des essais physiques à puissance nulle de la tranche de Bugey 5, d'une anomalie particulière survenue sur les crayons de poisons consommables réalisés en Pyrex (verre silico-boraté). Ces crayons étaient fabriqués en deux parties; celles-ci s'étaient séparées lors du transport, laissant apparaître un vide qui avait provoqué un pic de flux au milieu du cœur.

Spanish

Save record 1

Record 2 2011-04-18

English

Subject field(s)
  • Aeronautical Engineering and Maintenance
CONT

The rudder actuator is a tandem actuator, having two internal piston areas for each hydraulic source(A & B). The actuator is capable of positioning the rudder panel with either one or both main hydraulic sources available, though with one source inoperative a reduced rudder panel deflection would result due to blowdown at higher airspeeds. Flow of hydraulic fluid to the rudder actuator is controlled by the dual servo-valve. This is a complex dual concentric cylinder with an outer and inner slide. During normal rudder pedal inputs sufficient rudder panel deflection is catered for by the primary(inner) valve alone. However, should a larger panel deflection be required or a higher rate rudder input be commanded, the secondary(outer) sleeve moves in addition to port extra fluid to the actuator. Movement of the outer sleeve is typically no more than 1 mm. Position of both sleeves of the servo valve is controlled by a complex mechanism of bell cranks, input rod and summing lever, the geometry of which is such as to provide movement of the sleeves in relation to the body of the valve.

OBS

Equivalent found on a cutaway diagram of a Boeing 767.

OBS

rudder actuator: term standardized by ISO.

French

Domaine(s)
  • Aérotechnique et maintenance
OBS

servocommande de direction : terme normalisé par l'ISO; vérin de direction: terme uniformisé par le Comité d'uniformisation de la terminologie aéronautique (CUTA) - Maintenance.

Spanish

Save record 2

Record 3 1997-02-28

English

Subject field(s)
  • Hydrology and Hydrography
  • Scientific Measurements and Analyses
  • Metering Instruments
DEF

A light, hand-held, graduated, rigid rod, for sounding the depth and positioning the current-meter in order to measure the velocity in shallow streams suitable for wading [standardized by ISO].

OBS

This may also be used from boats or ice cover, at shallow depths.

OBS

wading rod: standardized by ISO.

French

Domaine(s)
  • Hydrologie et hydrographie
  • Mesures et analyse (Sciences)
  • Compteurs de consommation et débitmètres
DEF

Perche rigide et légère que l'on tient à la main, généralement graduée, pour mesurer la profondeur et mettre le moulinet en position afin de mesurer la vitesse dans les chenaux peu profonds [normalisée par l'ISO].

OBS

Elle peut être également utilisée à partir de bateaux ou d'une couverture de glace, dans les chenaux peu profonds.

OBS

perche support : normalisé par l'ISO.

Spanish

Campo(s) temático(s)
  • Hidrología e hidrografía
  • Medición y análisis (Ciencias)
  • Instrumentos de medición
DEF

Barra de mano ligera, rígida y graduada para sondear la profundidad y determinar la posición del molinete para la medición de la velocidad en corrientes de aguas poco profundas que pueden vadearse.

OBS

Puede ser usado desde embarcaciones o desde una capa de hielo.

Save record 3

Record 4 1990-10-01

English

Subject field(s)
  • Land Mines

French

Domaine(s)
  • Mines terrestres

Spanish

Save record 4

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