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  • Other Sources  (7)
  • FABRICATION TECHNOLOGY  (5)
  • Astronomy  (2)
  • 1
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    Solder Bonding for Power Transistors (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Indium solder boosts power rating and facilitates circuit changes. Efficient heat conduction from power transistor to heat sink provided by layer of indium solder. Low melting point of indium solder (141 degrees C) allows power transistor to be removed, if circuit must be reworked, without disturbing other components mounted with ordinary solder that melts at 181 degrees C. Solder allows devices operated at higher power levels than does conventional attachment by screws.
    Keywords: FABRICATION TECHNOLOGY
    Type: MSC-20570 , NASA Tech Briefs (ISSN 0145-319X); 8; 4; P. 559
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Vibration-resistant PC board feedthrough (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: New fabrication method uses annealed-nickel ribbon loop to interface coaxial input (or output) connector to printed-wiring board. Inexpensive ribbon interface cuts vibration-induced failure between coaxial cable and printed-wiring board.
    Keywords: FABRICATION TECHNOLOGY
    Type: MSC-16371 , NASA Tech Briefs (ISSN 0145-319X); 2; 2; P. 3
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Shaping Transistor Leads for Better Solder Joints (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Special lead-forming tool puts step in leads of microwave power transistors without damaging braze joints that fasten leads to package. Stepped leads are soldered to circuit boards more reliably than straight leads, and stress on brazes is relieved. Lead-forming hand-tool has two parts: a forming die and an actuator. Spring-loaded saddle is adjusted so that when transistor package is placed on it, leads rest on forming rails.
    Keywords: FABRICATION TECHNOLOGY
    Type: MSC-18837 , NASA Tech Briefs (ISSN 0145-319X); 6; 1; P. 99
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Future Directions for Astronomical Image Display (2000)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: In the "Future Directions for Astronomical Image Displav" project, the Smithsonian Astrophysical Observatory (SAO) and the National Optical Astronomy Observatories (NOAO) evolved our existing image display program into fully extensible. cross-platform image display software. We also devised messaging software to support integration of image display into astronomical analysis systems. Finally, we migrated our software from reliance on Unix and the X Window System to a platform-independent architecture that utilizes the cross-platform Tcl/Tk technology.
    Keywords: Astronomy
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Future Directions for Astronomical Image Display (1997)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: In our "Future Directions for Astronomical Image Display" project, the Smithsonian Astrophysical Observatory (SAO) and the National Optical Astronomy Observatories (NOAO) will evolve our existing image display software into a fully extensible, cross-platform image display server that can run stand-alone or be integrated seamlessly into astronomical analysis systems. We will build a Plug-in Image Extension (PIE) server for astronomy, consisting of a modular image display engine that can be customized using "plug-in" technology. We will create plug-ins that reproduce all the current functionality of SAOtng. We also will devise a messaging system and a set of distributed, shared data objects to support integrating the PIE server into astronomical analysis systems. Finally, we will migrate our PIE server, plug-ins, and messaging software from Unix and the X Window System to a platform-independent architecture that utilizes cross-platform technology such as Tcl/Tk or Java.
    Keywords: Astronomy
    Type: NASA/CR-97-112969 , NAS 1.26:112969
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Centrifugal Barrel Finishing Of Turbine-Blade "Fir Trees" (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Modified centrifugal barrel-finishing machine imparts desired residual compressive stresses to "fir trees" of turbine blades. Centrifugal forces generate compressive stresses, which are transmitted to turbine blades through abrasive slurries in which suspended. Eliminates need for shot peening, rounding of edges and burrs caused by shot peening and, consequently, need for mass finishing operations to remove burrs. Improves surface finish of "fir trees".
    Keywords: FABRICATION TECHNOLOGY
    Type: MFS-29553 , NASA Tech Briefs (ISSN 0145-319X); 14; 6; P. 84
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    NASA TECHNICAL REPORTS
  • 7
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    Ultrasonic Abrasive Removal Of EDM Recast (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Ultrasonic abrasive process removes layer of recast material generated during electrical-discharge machining (EDM) of damper pocket on turbine blade. Form-fitted tool vibrated ultrasonically in damper pocket from which material removed. Vibrations activate abrasive in pocket. Amount of material removed controlled precisely.
    Keywords: FABRICATION TECHNOLOGY
    Type: MFS-29545 , NASA Tech Briefs (ISSN 0145-319X); 14; 10; P. 97
    Format: text
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    NASA TECHNICAL REPORTS
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