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  • Other Sources  (5)
  • 1985-1989  (5)
  • 1920-1924
  • 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)
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    High purith low defect FZ silicon (1985)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The most common intrinsic defects in dislocation-free float zone (FZ) silicon crystals are the A- and B-type swirl defects. The mechanisms of their formation and annihilation have been extensively studied. Another type of defect in dislocation-free FZ crystals is referred to as a D-type defect. Concentrations of these defects can be minimized by optimizing the growth conditions, and the residual swirls can be reduced by the post-growth extrinsic gettering process. Czochralski (Cz) silicon wafers are known to exhibit higher resistance to slip and warpage due to thermal stress than do FZ wafers. The Cz crystals containing dislocations are more resistant to dislocation movement than dislocated FZ crystals because of the locking of dislocations by oxygen atoms present in the Cz crystals. Recently a transverse magnetic field was applied during the FZ growth of extrinsic silicon. Resultant flow patterns, as revealed by striation etching and spreading resistance in Ga-doped silicon crystals, indicate strong effects of the transverse magnetic field on the circulation within the melt. At fields of 5500 gauss, the fluid flow in the melt volume is so altered as to affect the morphology of the growing crystal.
    Keywords: SOLID-STATE PHYSICS
    Type: JPL Proceedings of the Flat-Plate Solar Array Project Workshop; p 109-121
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    NASA TECHNICAL REPORTS
  • 3
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    The use of electrical discharge for ignition and control of combustion of solid propellants (1987)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: As the first step of the study of the combustion control of solid propellants by electrical discharges, the effects of an arc discharge, which flows along the burning surface, on the burning rate and on the increase of enthalpy of the combustion product were investigated. For specially devised composite propellants, which are composed of Al and Teflon powders, it was shown that the combination can be controlled by an arc discharge; the combustion continues when the arc discharge is applied and is interrupted when the arc discharge breaks. In the present investigation, it was also shown that an arc discharge coupled with a high-frequency electrical discharge has potential as an effective ignition method for solid propellants. For the application of this type of combustion control to an ignitor for a solid propellant rocket motor or to a control rocket motor, this method lacks flexibility in the configuration scale and needs relatively high electric power at the present stage.
    Keywords: PROPELLANTS AND FUELS
    Type: NASA-TM-88548 , NAS 1.15:88548
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    NASA TECHNICAL REPORTS
  • 4
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    On the pilot's behavior of detecting a system parameter change (1986)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The reaction of a human pilot, engaged in compensatory control, to a sudden change in the controlled element's characteristics is described. Taking the case where the change manifests itself as a variance change of the monitored signal, it is shown that the detection time, defined to be the time elapsed until the pilot detects the change, is related to the monitored signal and its derivative. Then, the detection behavior is modeled by an optimal controller, an optimal estimator, and a variance-ratio test mechanism that is performed for the monitored signal and its derivative. Results of a digital simulation show that the pilot's detection behavior can be well represented by the model proposed here.
    Keywords: BEHAVIORAL SCIENCES
    Type: NASA-TM-88536 , NAS 1.15:88536 , (ISSN 0021-4663)
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    NASA TECHNICAL REPORTS
  • 5
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    Oblique subduction and collision: Forearc tectonics of the Kuril arc (1986)
    GSA, Geological Society of America
    In:  Geology, 14 (5). pp. 404-407.
    Details
    Publication Date: 2019-05-24
    Description: The tectonics of the southwestern Kuril arc are a result of the oblique subduction of the Pacific plate at the Kuril Trench. In association with forearc sliver migration caused by the oblique subduction, collision tectonics occur at the leading margin of the sliver and tensional tectonics take place at the tapering margin. As a result of the collision, a deep crustal section of island arc is observed at the leading margin of the forearc sliver. Tectonics of the Kuril arc related to oblique subduction are different from those of the western Sunda arc, where backarc spreading occurs at the leading margin. This difference is due to margin morphology of the oblique subduction zone.
    Type: Article , PeerReviewed
    Format: text
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    PAPER (OCEANREP)
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