Study of a Renovated Command Module Laboratory and Renovated Command Module. Volume 3 - Subsystems Analysis Final Report

Technical feasibility of renovated command module laboratory and renovated command modul

Generation of static electricity during fluidisation of polyethylene and its elimination by air ionisation

International audienceStatic electricity is the cause of many problems in the process industries, in particular, when handling powders and granules. The methods usually used to reduce static electricity involve the addition of antistatic agents, the increase of relative humidity or ionisation. But these solutions can give rise to other problems. The purpose of this paper is, first, to study the kinetics of electrostatic charging of polyethylene granules and powders in a fluidised bed and, second, to study the elimination of the static electricity using the same particles with a special supersonic injector producing a neutral cloud of positive and negative ions. The experiments involve taking samples of particles at various times and various locations in the bed and measuring the charge-to-mass ratio by means of a Faraday pail connected to an electrometer. It is found that the electrostatic charge increases during fluidisation up to a limiting value. Concerning the charges elimination, it is shown that ions ejected from the eliminator cannot penetrate into the bulk of particles. Only the particles on the upper surface of the bed are discharged. Thus, the efficiency of the supersonic injector for overall charge neutralisation depends on the movement of the particles in the bed and, in particular, the rate of renewal of the upper surface of the fluidised bed

Shuttle orbiter Ku-band radar/communications system design evaluation

Tasks performed in an examination and critique of a Ku-band radar communications system for the shuttle orbiter are reported. Topics cover: (1) Ku-band high gain antenna/widebeam horn design evaluation; (2) evaluation of the Ku-band SPA and EA-1 LRU software; (3) system test evaluation; (4) critical design review and development test evaluation; (5) Ku-band bent pipe channel performance evaluation; (6) Ku-band LRU interchangeability analysis; and (7) deliverable test equipment evaluation. Where discrepancies were found, modifications and improvements to the Ku-band system and the associated test procedures are suggested