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COLD AIR TESTING [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2001-08-29

English

Subject field(s)
  • Bearings and Bearing Systems (Mechanical Components)
  • Navigation Instruments
  • Flight Instruments and Equipment (Aeroindustry)
  • Ship Piloting
CONT

SIMSAT-The AFIT spacecraft simulator, a three-axis 200 lb. Testbed supported on a spherical air bearing. Capable of simulating three-axis rotational maneuvers of satellites. The Tri-Axis Spherical Air Bearing is a custom spin test machine which uses a spherical gas bearing to achieve a low friction support system with three rotational degrees-of freedom for use in testing cold gas attitude control systems(ACS) of small and large space vehicles. The Air Bearing System consists primarily of a highly polished ball on a stiff shaft, constituting a rotor assembly, which floats on a film of compressed gas. The rotor assembly supports objects weighing up to 300 pounds.

OBS

gas bearing. A journal or thrust bearing lubricated with gas. Also known as gas-lubricated bearing.

French

Domaine(s)
  • Paliers, coussinets et roulements (Composants mécaniques)
  • Instruments de navigation
  • Instruments et équipement de bord (Constructions aéronautiques)
  • Pilotage des navires
CONT

Gyroscope [...] Le corps solide en rotation est supporté dans son carter par l'intermédiaire de deux paliers à roulements à billes ou quelquefois à gaz assurant la liberté de la rotation du gyroscope autour de son axe de révolution. [...] Les paliers à gaz sont maintenant très répandus dans les matériels de navigation par inertie pour avions et navires. Ils sont de plusieurs types : sphériques, coniques, cylindriques.

Key term(s)
  • palier sphérique

Spanish

Save record 1

Record 2 1991-03-21

English

Subject field(s)
  • Diagnostic Procedures (Medicine)
  • Bronchi
CONT

To assess the sensitivity of isocapnic hyperventilation with cold air in detecting airway hyperreactivity in asthmatic children, we studied 13 asthmatic patients... and 10 normal children. Cold air challenge consisted of 4 minutes of moderate hyperventilation plus another 4 minutes of maximal hyperventilation, both with subfreezing air(-16 degrees to-18 degrees C)... We conclude that exercise and cold air-induced bronchospasm have different physiologic mechanisms, and that cold air testing can be used as a routine challenge to identify airway hyperreactivity in children.

OBS

Response to cold air hyperventilation in normal and in asthmatic children, J. Pediatr. (U.S.), April, 1984, 104(4), pp. 516-21, ISSN 0022-3476.

French

Domaine(s)
  • Méthodes diagnostiques (Médecine)
  • Bronches
OBS

[On] peut également utiliser un test d'hyperventilation en air sec et froid, fourni par exemple par une bouteille d'air comprimé, qui donnera un résultat analogue, sinon identique à celui de l'épreuve d'exercice.

Spanish

Save record 2

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