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  • INSTRUMENTATION AND PHOTOGRAPHY  (4)
  • Engineering General  (1)
  • 1980-1984  (2)
  • 1975-1979  (1)
  • 1970-1974  (2)
  • 1
    Electronic Resource
    Electronic Resource
    A higher-order triangular finite element for the solution of field problems in orthotropic media (1973)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 7 (1973), S. 287-295 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: This paper presents a triangular finite element for the solution of two-dimensional field problems in orthotropic media. The element has nine degrees of freedom, these being the potential and its two derivatives at each node.The ‘stiffness’ matrix is derived analytically so that no further integration is required when computations are performed using the element.The results obtained using the element are compared with the exact mathematical solution of both a temperature distribution and a torsion problem.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620070306
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    Paper (German National Licenses)
    Fulltext
  • 2
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    A diode-quad bridge circuit for use with capacitance transducers (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Review of Scientific Instruments; 44; Oct. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The development of a power spectral density processor for C and L band airborne radar scatterometer sensor systems (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A real-time signal processor was developed for the NASA/JSC L-and C-band airborne radar scatterometer sensor systems. The purpose of the effort was to reduce ground data processing costs. Conversion of two quadrature channels of data (like and cross polarized) was made to obtain Power Spectral Density (PSD) values. A chirp-z transform (CZT) approach was used to filter the Doppler return signal and improved high frequency and angular resolution was realized. The processors have been tested with record signals and excellent results were obtained. CZT filtering can be readily applied to scatterometers operating at other wavelengths by altering the sample frequency. The design of the hardware and software and the results of the performance tests are described in detail.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-171668 , NAS 1.26:171668 , LEMSCO-19158
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Soft X-ray and XUV imaging with a charge-coupled device /CCD/-based detector (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: A soft X-ray/XUV imaging camera which uses a thinned, back-illuminated, all-buried channel RCA CCD for radiation sensing has been built and tested. The camera is a slow-scan device which makes possible frame integration if necessary. The detection characteristics of the device have been tested over the 15-1500 eV range. The response was linear with exposure up to 0.2-0.4 erg/sq cm; saturation occurred at greater exposures. Attention is given to attempts to resolve single photons with energies of 1.5 keV.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Solid state imagers for astronomy; June 10, 11, 1981; Cambridge, MA
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Application of laser velocimetry to an unsteady transonic flow (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Measurements of mean velocity, turbulent kinetic energy, and turbulent shear stress have been obtained in an unsteady but periodic flow. Polystyrene spheres, 0.35-0.55 microns in diameter, were injected into the tunnel settling chamber to seed the flow for a laser velocimeter. Synchronized counters together with an encoding interface and digital-to-analog converters were used to record the data on an analog tape recorder. Profiles of velocity and turbulence quantities are presented for several times during the periodic flow.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ICIASF ''79; International Congress on Instrumentation in Aerospace Simulation Facilities; Sep 24, 1979 - Sep 26, 1979; Monterey, CA
    Format: text
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    NASA TECHNICAL REPORTS
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