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  • Other Sources  (6)
  • 1
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    Development of Bio-GAS systems (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Four experiment systems which have fundamental significance in the field of biotechnology are developed for the Get Away Special (GAS). Unique considerations were necessary to develop the systems which carry out biotechnological experiments under GAS's restricted conditions: delicate thermal control, fluid handling and protection from contamination. All experimental processes are controlled by internal sequencers and results of the experiments are recorded as images and numerical data within the systems. The systems are standardized in order to enable repeated use with a variety of experiments by replacement of the experiment modules and modification of experiment sequencing programs.
    Keywords: ASTRONAUTICS (GENERAL)
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    NASA TECHNICAL REPORTS
  • 2
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    Protein-crystal growth experiment (planned) (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: To evaluate the effectiveness of a microgravity environment on protein crystal growth, a system was developed using 5 cubic feet Get Away Special payload canister. In the experiment, protein (myoglobin) will be simultaneously crystallized from an aqueous solution in 16 crystallization units using three types of crystallization methods, i.e., batch, vapor diffusion, and free interface diffusion. Each unit has two compartments: one for the protein solution and the other for the ammonium sulfate solution. Compartments are separated by thick acrylic or thin stainless steel plates. Crystallization will be started by sliding out the plates, then will be periodically recorded up to 120 hours by a still camera. The temperature will be passively controlled by a phase transition thermal storage component and recorded in IC memory throughout the experiment. Microgravity environment can then be evaluated for protein crystal growth by comparing crystallization in space with that on Earth.
    Keywords: MATERIALS PROCESSING
    Type: NASA. Goddard Space Flight Center, The 1987 Get Away Special Experimenter's Symposium; p 63-68
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    NASA TECHNICAL REPORTS
  • 3
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    Ion thruster charge-exchange plasma flow (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: (Previously cited in issue 07, p. 996, Accession no. A82-19802)
    Keywords: SPACECRAFT PROPULSION AND POWER
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  • 4
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    Development of the Engineering Test Satellite-3 (ETS-3) ion engine system (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The ion engine system onboard the ETS-3 is discussed. The system consists of two electron bombardment type mercury ion engines with 2 mN thrust and 2,000 sec specific impulse and a power conditioner with automatic control functions. The research and development of the system, development of its EM, PM and FM, the system test and the technical achievements leading up to final launch are discussed.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-TM-77538 , NAS 1.15:77538
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  • 5
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    Ion thruster charge-exchange plasma flow (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The electron bombardment ion thruster has been under development for a number of years and during this time, studies of the plasmas produced by the thrusters and their interactions with spacecraft have been evaluated, based on available data. Due to diagnostic techniques used and facility effects, there is uncertainty as to the reliability of data from these early studies. This paper presents data on the flow of the charge-exchange plasma produced just downstream of the thruster's ion optics. The 'end-effect' of a cylindrical Langmuir probe is used to determine ion density and directed ion velocity. Results are compared with data obtained from a retarding potential analyzer-Faraday cup.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: AIAA PAPER 82-0403 , Aerospace Sciences Meeting; Jan 11, 1982 - Jan 14, 1982; Orlando, FL
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  • 6
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    Experimental measurements of the plasma sheath around pinhole defects in a simulated high-voltage solar array (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An emissive Langmuir probe was used to measure the potentials within the plasma sheath developed around a hole in a simulated solar array at voltages between 50 and 450 V. The hole sizes were larger than actual pinhole defects; the plasma density was in the 10,000 per cu cm range, which is considerably lower than the density of 1,000,000 per cu cm found at low-earth-orbit altitudes. Despite these inadequacies in the simulation, the experiments indicate that this type of probe is a useful diagnostic technique for investigating the plasma sheaths developing around pinhole defects.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: AIAA PAPER 83-0311 , American Institute of Aeronautics and Astronautics, Aerospace Sciences Meeting; Jan 10, 1983 - Jan 13, 1983; Reno, NV
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