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  • FABRICATION TECHNOLOGY  (2)
  • Analytical Chemistry and Spectroscopy  (1)
  • Acoustics
  • 1990-1994  (3)
  • 1
    Electronic Resource
    Electronic Resource
    ‘Through-space’ hydrogen-fluorine, carbon-fluorine and fluorine-fluorine spin-spin coupling in 2-phenyl-3-alkyl-4,5,6,7-tetrahydroindazoles (1993)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 31 (1993), S. 323-328 
    Details
    ISSN: 0749-1581
    Keywords: Through-space coupling ; Tetrahydroindazoles ; Protoporphyrinogen oxidase ; Molecular mechanics ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1H, 13C and 19F NMR experiments for a series of 3-alkyl-2-phenyl-4,5,6,7-tetrahydroindazoles revealed a six-bond through-space coupling between the ortho-fluorine and the hydrogen or fluorine atom of the position 3-alkyl group. This was further supported by NOE experiments. Molecular mechanics calculations on a representative structure indicated that several low energy conformers met the fluorine-carbon distance constraint suggested by the NMR data, and dynamic annealing experiments produced a conformer which was in complete agreement with the NMR data. This through-space interaction is speculated to be a result of repulsion between N-1 of the tetrahydroindazole and the ortho-fluorine lone pair electrons.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260310402
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Unknown
    Zoom Vision System For Robotic Welding (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Rugged zoom lens subsystem proposed for use in along-the-torch vision system of robotic welder. Enables system to adapt, via simple mechanical adjustments, to gas cups of different lengths, electrodes of different protrusions, and/or different distances between end of electrode and workpiece. Unnecessary to change optical components to accommodate changes in geometry. Easy to calibrate with respect to object in view. Provides variable focus and variable magnification.
    Keywords: FABRICATION TECHNOLOGY
    Type: MFS-29712 , NASA Tech Briefs (ISSN 0145-319X); 14; 11; P. 82
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Infrared Thermography For Welding (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Infrared imaging and image-data-processing system shows temperatures of joint during welding and provides data from which rates of heating and cooling determined. Information used to control welding parameters to ensure reliable joints, in materials which microstructures and associated metallurgical and mechanical properties depend strongly on rates of heating and cooling. Applicable to variety of processes, including tungsten/inert-gas welding; plasma, laser, and resistance welding; cutting; and brazing.
    Keywords: FABRICATION TECHNOLOGY
    Type: MFS-29746 , NASA Tech Briefs (ISSN 0145-319X); 16; 2; P. 100
    Format: text
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    NASA TECHNICAL REPORTS
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