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  • 1
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    Development of an electrostatic positioner for space material processing (1985)
    American Institute of Physics
    Details
    Publication Date: 1985-02-01
    Print ISSN: 0034-6748
    Electronic ISSN: 1089-7623
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 2
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    A new method for the production of large spherical monosized polymer particles for biomedical and chromatographic applications (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: CHEMISTRY AND MATERIALS (GENERAL)
    Type: Journal of Polymer Science: Polymer Chemistry Edition (ISSN 0360-6376); 28; 2085-209
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Development of an electrostatic positioner for space material processing (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: This paper describes an electrostatic positioning instrument which was developed at the Jet Propulsion Laboratory to enable experimenters to conduct containerless material science experiments in space. Samples that are to be studied are electrically charged and controlled by the electrostatic force produced by a set of properly arranged electrodes. Three different types of positioners are described, i.e., the dish type, the ring type, and the tetrahedral type. In all these systems, the positioning and the damping of the sample is accomplished by a feedback control system. The advantage of this electrostatic positioning method, in comparison to the other methods, such as acoustic and electromagnetic, lies in the fact that it can operate in a high vacuum and does not require the material to be electrically conductive as long as the material can carry a certain amount of charge.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: Review of Scientific Instruments (ISSN 0034-6748); 56; 307-317
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Sunlight reflections from a solar power satellite on solar mirrors should not harm the eyes (1980)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The potential hazard imposed by the reflection of the Sun's image by the solar power satellite (SPS) was examined. In the worst case, where the transmitter is assumed to be a perfect mirror reflecting the Sun's image normal to the atmosphere, the total energy received by the eye would be 3.36 x 10 to the -7th power watts. The eye's optics would blur the 5.6 sec of art image of the transmitter over a disk approximately 6 minutes arc in diameter, reducing the maximum intensity at the retina by 99%. A given cone in the retina would receive even less energy due to the constant random microtremors and microsaccadic movements of the eye muscles which move the retina over an area some 8 minutes of arc in radius, even during steady fixation. Therefore, very conservative estimates show that the reflections from the transmitter could be viewed safety for at least 3.2 hours and that the entire SPS structure could be viewed for a minimum of 1 hour. The solares mirror is briefly considered and is shown to be safe to view for at least 2.4 minutes.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA, Washington The Final Proc. of the Solar Power Satellite Program Rev.; p 460-463
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Containerless polymeric microsphere production for biomedical applications (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A containerless method that produces highly uniform microspheres (greater than 50 microns in diameter) from many materials has been developed for biomedical applications. A piezoelectrically vibrated drop generator forms uniform (monodisperse) monomer droplets that are either electrostatistically levitated and polymerized using UV irradiation, or free-radical polymerized. Spheres of 2-hydroxyethyl methacrylate polymer have been produced with diameters of 155 microns + or - 1.57 percent.
    Keywords: MATERIALS PROCESSING
    Type: Materials processing in the reduced gravity environment of space; Dec 01, 1986 - Dec 03, 1986; Boston, MA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Charged drop levitators and their applications (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An account is given of the charged drop levitation characteristics of two different devices: (1) a feedback-controlled electrostatic levitator able to lift a several mm-diameter drop in 1g conditions, which is applicable to drop dynamics, crystal growth, and supercooling/solidification experiments; and (2) a linear quadrupole levitator, whose advantages are demonstrated in light of the results obtained for the charged drop instability experiment. The cause of the premature drop burstings observed is suggested to be an electron avalanche in the surrounding gaseous medium rather than the Rayleigh limit.
    Keywords: MATERIALS PROCESSING
    Type: Materials processing in the reduced gravity environment of space; Dec 01, 1986 - Dec 03, 1986; Boston, MA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
    Electronic Resource
    Electronic Resource
    Development of an electrostatic positioner for space material processing (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 307-317 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This paper describes an electrostatic positioning instrument which was developed at the Jet Propulsion Laboratory to enable experimenters to conduct containerless material science experiments in space. Samples that are to be studied are electrically charged and controlled by the electrostatic force produced by a set of properly arranged electrodes. Three different types of positioners are described, i.e., the dish type, the ring type, and the tetrahedral type. In all these systems, the positioning and the damping of the sample is accomplished by a feedback control system. The advantage of this electrostatic positioning method, in comparison to the other methods, such as acoustic and electromagnetic, lies in the fact that it can operate in a high vacuum and does not require the material to be electrically conductive as long as the material can carry a certain amount of charge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138349
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    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    A new method for the production of large spherical monosized polymer particles for biomedical and chromatographic applications (1990)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 28 (1990), S. 2085-2095 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Monosized droplets of 2-hydroxyethyl methacrylate (HEMA) and glycerol monomethacrylate (GMA) were made by passing the monomers under pressure through a nozzle coupled to an energized piezoelectric crystal. The droplets were allowed to fall into liquid nitrogen where they vitrified. The radiation post-polymerization of the monomer spheres was investigated. Uniform monosized poly-HEMA particles in the 100-300 μm diameter range were prepared with a coefficient of variation of 1.57% for particles of 155 μm in diameter. Monosized poly-GMA was also prepared. The post-polymerization conversion of pre-irradiated GMA vitrified monomer droplets as a function of thawing rate and radiation dosage was investigated.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1990.080280806
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    Paper (German National Licenses)
    Fulltext
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