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CRITICAL DIAMETER [8 records]

Record 1 2015-08-28

English

Subject field(s)
  • Nuclear Physics
DEF

An infinite cylinder of smallest diameter which can be made critical with a mixture of this fissile material and any other materials with no additional restriction as to geometrical arrangement, material composition and moderating and reflecting media.

OBS

minimum critical infinite cylinder: term and definition standardized by ISO.

French

Domaine(s)
  • Physique nucléaire
DEF

Diamètre minimal du cylindre de longueur infinie pour lequel un mélange d'une matière fissile avec une autre matière peut être rendu critique, quels que soient la disposition géométrique, la composition matérielle et les milieux modérateur et réflecteur.

OBS

diamètre critique minimal de cylindre infini : terme et définition normalisés par l'ISO.

Spanish

Save record 1

Record 2 2012-02-06

English

Subject field(s)
  • Cooling and Ventilating Systems
CONT

Forward curved blade fans. Forward curved blades... are mounted on what is often referred to as a squirrel cage rotor. Fans with these blades produce a high volume for their size, and are lightweight and economical. Because forward curved blades can collect deposits they are only used for handling clean air. Forward curved blade fans are used extensively in small air handling equipment(less than 610 mm diameter). Their efficiency is lower than that of airfoil fans. The scroll is often similar to other centrifugal fan designs, however, the clearance between the impeller and inlet is not as critical as for airfoil or backward inclined blade impellers.

French

Domaine(s)
  • Systèmes de refroidissement et de ventilation
CONT

Les turbines des ventilateurs centrifuges ont généralement les AUBES inclinées vers l'avant (ventilateurs d'action), mais il existe certains ventilateurs ayant les AUBES inclinées vers l'arrière (ventilateurs de réaction) [...]

Spanish

Save record 2

Record 3 - external organization data 2007-11-08

English

Subject field(s)
  • Nuclear Power Stations
  • Pipes and Fittings
  • Compartment - Canadian Nuclear Safety Commission
CONT

For a CANDU, voiding may start for a break size of 4 [inch] diameter pipe or less. This encompasses feeder sizes, therefore the relationship between the make-up capacity and the diameter of feeders is critical.

French

Domaine(s)
  • Centrales nucléaires
  • Tuyauterie et raccords
  • Tiroir - Commission canadienne de sûreté nucléaire
CONT

Dans le cas d'un CANDU, le vidage, ou expulsion du caloporteur, peut débuter par une fissure observée dans une conduite dont le diamètre est de 4 po ou moins. Cela comprend les conduites d'alimentation; par conséquent, la relation entre la capacité d'appoint et le diamètre des conduites d'alimentation est critique.

Spanish

Save record 3

Record 4 - external organization data 2007-08-27

English

Subject field(s)
  • Nuclear Fission Reactors
  • Compartment - Canadian Nuclear Safety Commission
CONT

For a CANDU, voiding may start for a break size of 4 [inch] diameter pipe or less. This encompasses feeder sizes, therefore the relationship between the make-up capacity and the diameter of feeders is critical.

French

Domaine(s)
  • Réacteurs nucléaires de fission
  • Tiroir - Commission canadienne de sûreté nucléaire
CONT

Dans le cas d'un CANDU, le vidage, ou expulsion du caloporteur, peut débuter par une fissure observée dans une conduite dont le diamètre est de 4 po ou moins. Cela comprend les conduites d'alimentation; par conséquent, la relation entre la capacité d'appoint et le diamètre des conduites d'alimentation est critique.

Spanish

Save record 4

Record 5 2003-02-24

English

Subject field(s)
  • Fluid Mechanics and Hydraulics (Physics)
  • Research Experiments in Space
CONT

Typical experiments for the Fluid Science Modules are experiments dealing with Marangoni convection or critical point phenomena. For example... Thermocapillary drop motion :... The following process was automated : creation of a linear thermal gradient by heating one wall of the cell and cooling the opposite one; injection of a series of drops in the cell. The drops were from 1 mm to 4 mm in diameter. The motion of the drops was filmed by a video-camera and observed and recorded in real time on the ground.

French

Domaine(s)
  • Mécanique des fluides et hydraulique (Physique)
  • Travaux de recherche dans l'espace

Spanish

Save record 5

Record 6 1989-05-23

English

Subject field(s)
  • Blasting Work (Mining)
CONT

The second aspect of performance sensitivity is usually distinguished by the name of Propagation Sensitivity, which is a measure of the ability of an explosive to support or reinforce a detonation that has already been created. Since the tendency for the detonation wave to fail or fade increases as the hole diameter is reduced, it has become customary to measure propagation sensitivity by the(minimum) critical diameter of a charge at least six diameters long that will support the detonation process once created. At a point below this value, a detonation wave cannot be consistently propagated, and a misfire... may occur; or otherwise the reaction may be incomplete, resulting in a poor blast effect and significant fume.

French

Domaine(s)
  • Travail aux explosifs (Exploitation minière)
CONT

Sensibilité à l'onde explosive. C'est une caractéristique très importante car elle conditionne la transmission de la détonation dans une file de cartouches. La Commission de Normalisation a adopté comme critère le coefficient de transmission de détonation (CTD), (...) La sensibilité à l'onde explosive est fonction de la densité de l'explosif et de son état (pulvérulent, gélatineux, fondu). Quand la densité est trop élevée, surtout avec les explosifs nitratés, l'onde explosive provoquée par le détonateur peut ne pas agir, ou s'arrêter en cours de propagation : on a alors un raté, ou un culot d'explosif.

Spanish

Save record 6

Record 7 1988-10-26

English

Subject field(s)
  • Blasting Work (Mining)
CONT

The second aspect of performance sensitivity is usually distinguished by the name of Propagation Sensitivity, which is a measure of the ability of an explosive to support or reinforce a detonation that has already been created. Since the tendency for the detonation wave to fail or fade increases as the hole diameter is reduced, it has become customary to measure propagation sensitivity by the(minimum) critical diameter of a charge at least six diameters long that will support the detonation process once created. At a point below this value, a detonation wave cannot be consistently propagated, and a misfire... may occur; or otherwise the reaction may be incomplete, resulting in a poor blast effect and significant fume.

French

Domaine(s)
  • Travail aux explosifs (Exploitation minière)
DEF

Diamètre d'une charge cylindrique de substance explosive au-dessous duquel cette substance ne peut pas détoner.

Spanish

Save record 7

Record 8 1986-07-04

English

Subject field(s)
  • Oil and Natural Gas Extraction
CONT

The total flow characteristic of the hypothetical well bore... is almost horizontal at atmospheric wellhead pressure, which shows that this bore, with the(unspecified) diameter in use, would just about attain critical flow-i. e. sonic velocity-when discharging freely to atmosphere.

French

Domaine(s)
  • Extraction du pétrole et du gaz naturel

Spanish

Save record 8

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