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  • Other Sources  (8)
  • NASA Technical Reports  (8)
  • ELECTRONIC COMPONENTS AND CIRCUITS  (6)
  • MACHINERY
  • 1995-1999  (4)
  • 1990-1994  (4)
  • 1950-1954
  • 1
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    Low-Reflectance Surfaces For Solar Cells (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Improved method for increasing solar cell efficiency has potential application for space-based and terrestrial solar power systems and optoelectronic devices. Etched low-angle grooves help recover reflected light. Light reflected from v-grooved surface trapped in cover glass and adhesive by total internal reflection. Reflected light redirected onto surface, and greater fraction of incident light absorbed, producing more electrical energy in InP solar photovoltaic cell.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: LEW-15612 , Laser Tech. Brief.; 2; 1; P. 96
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Electronic Compensation For Distortion Of Antenna Reflector (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Proposed method of obtaining approximately desired radiation or reception pattern from antenna that includes reflector based on concept of superposition of electromagnetic fields generated by multiple feedhorns or feed antenna elements arrayed at various positions near reflector and excited at electronically adjustable magnitudes and phases. In intended application, reflector nominally paraboloidal, feed elements N feedhorns in hexagonal array, and method used to compensate for deviations of real reflector surface from nominal paraboloidal shape. Method and concept also applicable to electronic beam steering and electronic antenna compensation in other situations.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: LAR-14461 , NASA Tech Briefs (ISSN 0145-319X); 19; 1; P. 32
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Computing Dynamics Of A Robot Of 6+n Degrees Of Freedom (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Improved formulation speeds and simplifies computation of dynamics of robot arm of n rotational degrees of freedom mounted on platform having three translational and three rotational degrees of freedom. Intended for use in dynamical modeling of robotic manipulators attached to such moving bases as spacecraft, aircraft, vessel, or land vehicle. Such modeling important part of simulation and control of robotic motions.
    Keywords: MACHINERY
    Type: MSC-21751 , NASA Tech Briefs (ISSN 0145-319X); 19; 3; P. 94
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    NASA TECHNICAL REPORTS
  • 4
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    Automated Positioner For A Specimen In A Vacuum Chamber (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Custom-build apparatus positions specimen in vacuum system in three translational and one rotational degree of freedom. Operates under manual control, local microprocessor control, or remote computer control via general-purpose interface bus (GPIB), specific control option being selectable by technician. Used to position and orient specimen for secondary-ion mass spectroscopy (SIMS). Apparatus made from relatively inexpensive parts.
    Keywords: MACHINERY
    Type: LEW-15904 , NASA Tech Briefs (ISSN 0145-319X); 19; 9; P. 112
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    NASA TECHNICAL REPORTS
  • 5
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    Computing Radiation From Multiple-Circular-Aperture Antennas (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Mutual Coupling Program for Circular Waveguide-fed Aperture Array (CWG) computer program developed to calculate electromagnetic interactions among elements of antenna arrays with circular apertures with specified distributions of electromagnetic fields in apertures. Distributions assumed superpositions of electromagnetic modes existing in circular waveguide. Various external media included to provide flexibility of use; for example, flexibility to determine effects of dielectric covers upon impedances of aperture-type antennas. Written in VAX FORTRAN for DEC VAX-series computers running VMS (LAR-15236) and IBM PC-series and compatible computers running MS-DOS (LAR-15226).
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: LAR-15226 , LAR-15236 , NASA Tech Briefs (ISSN 0145-319X); 19; 4; P. 62
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    NASA TECHNICAL REPORTS
  • 6
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    V-Grooved GaAs Solar Cell (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: V-grooved GaAs solar photovoltaic cells increase optical coupling and greater conversion of light into electricity. Increases both trapping of incident light and lengths of optical paths in cell material. Net effect increases in total absorptivity, tolerance to damage by energetic particles, and short-circuit current. These improvements expected to follow from similar improvements obtained in silicon solar cells.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: LEW-14954 , NASA Tech Briefs (ISSN 0145-319X); 15; 2; P. 16
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    NASA TECHNICAL REPORTS
  • 7
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    Resistively Loaded Microstrip-Patch Antenna (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Strips of thin resistive material added near two edges of conventional micro-strip-patch antenna. Bandwidth doubled by simple modification. Optimum bandwidth performance obtained by adjustment of shapes, resistances, and locations of resistive strips.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: LAR-13973 , NASA Tech Briefs (ISSN 0145-319X); 17; 8; P. 34
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  • 8
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    More About V-Grooved GaAs Solar Cells (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: NASA technical memorandum presents additional information about experimental devices described in "V-Grooved GaAs Solar Cell" (LEW-14954). Experimental V-groove cells exhibited improved optical coupling and greater short-circuit current.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: LEW-15007 , NASA Tech Briefs (ISSN 0145-319X); 17; 3; P. 40
    Format: text
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    NASA TECHNICAL REPORTS
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