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  • 1
    Electronic Resource
    Electronic Resource
    Experimental evidence for a low-lying torsional mode in polymers (1973)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 11 (1973), S. 1435-1440 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Longitudinal and transverse sound velocities have been measured in several samples of polystyrene crosslinked with various weight percentages of divinylbenzene. Specific heats of these same samples have been measured previously. These data obtained calorimetrically, together with similar data obtained by others for some other polymers, can be accounted for by postulating the existence of a fourth mode of vibration with a velocity close to that measured for the two transverse modes. It is suggested that this fourth mode is one arising from the torsional coupling of the side groups along the backbone chain of the polymer molecule.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1973.180110716
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Types of thermal plumes in coastal waters☆ (1977)
    Elsevier
    Details
    Publication Date: 1977-01-01
    Print ISSN: 0043-1354
    Electronic ISSN: 1879-2448
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Elsevier
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    PAPER CURRENT
  • 3
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    Molding Epibond 100‐A for Use in Constructing Cryogenic Apparatus (1968)
    American Institute of Physics
    Details
    Publication Date: 1968-08-01
    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
  • 4
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    Scanning thermal plumes (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Over a three-year period 800 thermal line scans of power plant plumes were made by an airborne scanner, with ground truth measured concurrently at the plants. Computations using centered finite differences in the thermal scanning imagery show a lower bound in the horizontal temperature gradient in excess of 1.6 C/m. Gradients persist to 3 m below the surface. Vector plots of the velocity of thermal fronts are constructed by tracing the front motion in successive thermal images. A procedure is outlined for the two-point ground calibration of a thermal scanner from an equation describing the scanner signal and the voltage for two known temperatures. The modulation transfer function is then calculated by input of a thermal step function and application of digital time analysis techniques using Fast Fourier Transforms to the voltage output. Field calibration tests are discussed. Data accuracy is limited by the level of ground truth effort chosen.
    Keywords: ENVIRONMENT POLLUTION
    Type: Photogrammetric Engineering and Remote Sensing; 41; Oct. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Infrared radiometric technique in temperature measurement (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: One class of commercially available imaging infrared radiometers using cooled detectors is sensitive to radiation over the 3 to 12 micron wavelength band. Spectral filters can tailor instrument sensitivity to specific regions where the target exhibits optimum radiance. The broadband spectral response coupled with real time two-dimensional imaging and emittance/background temperature corrections make the instruments useful for remote measurement of surface temperatures from -20 C to +1500 C. Commonly used radiometric techniques and assumptions are discussed, and performance specifications for a typical modern commercial instrument are presented. The potential usefulness of an imaging infrared radiometer in space laboratories is highlighted through examples of research, nondestructive evaluation, safety, and routine maintenance applications. Future improvements in instrument design and application of the radiometric technique are discussed.
    Keywords: MATERIALS PROCESSING
    Type: NASA, Washington, D.C. Noncontact Temperature Measurement; p 367-383
    Format: application/pdf
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  • 6
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    Types of thermal plumes in coastal waters (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A large number of thermal images of the surface temperatures of the thermal plumes associated with the once-through cooling of electric power plants show that four kinds of plume occur sufficiently often to be classified as distinct plume types. Each type has implications for both numerical models and measurement strategies.
    Keywords: ENVIRONMENT POLLUTION
    Type: Water Research; 11; 1, 19; 1977
    Format: text
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  • 7
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    Scanning thermal plumes (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: In order to study the behavior and effects of thermal plumes associated with the condenser cooling of power plants, thermal line scans are periodically made from aircraft over all power plants along the Wisconsin shore of Lake Michigan. Simultaneous ground truth is also gathered with a radiometer. Some sequential imagery has been obtained for periods up to two hours to study short term variations in the surface temperature of the plume. The article concentrates on the techniques used to analyze thermal scanner data for a single power plant which was studied intensively. The calibration methods, temperature dependence of the thermal scanner, and calculation of the modulation transfer function for the scanner are treated. It is concluded that obtaining quantitative surface-temperature data from thermal scanning is a nontrivial task. Accuracies up to plus or minus 0.1 C are attainable.
    Keywords: ENVIRONMENT POLLUTION
    Type: International Symposium on Remote Sensing of Environment; Apr 15, 1974 - Apr 19, 1974; Ann Arbor, MI
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    A thermal scanning study of coastal upwelling in Lake Superior (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The use of a thermal scanner to monitor the time evolution of the thermal structure of the coastal waters in Lake Superior during an upwelling event is described. Mosaics of thermal imagery from ten different times are described. Qualitative descriptions of the imagery give insight into the upwelling event. Recommendations for future use of a thermal scanner to monitor an upwelling event are discussed.
    Keywords: OCEANOGRAPHY
    Type: ASP 79-147 , American Society of Photogrammetry, Annual Meeting; Mar 18, 1979 - Mar 24, 1979; Washington, DC
    Format: text
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  • 9
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    Interactive analysis of thermal imagery (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Necessary knowledge is presented on data acquisition and preparation for analysis of thermal imagery of power plant heated discharges remotely sensed from an aircraft, with special emphasis on analog to digital conversion of analog tapes acquired during scanning and to geometrical scaling. The central element in the interactive analysis of thermal imagery is an interactive graphics computer terminal which allows an interpreter to effectively interact with a large-scale computer, providing decisions or data as computations are carried out. A temperature calibration is performed, which the interpreter may test anywhere on the image. When satisfied that calibration is correct, the portion of the image to be analyzed is outlined. Printed and microfiche analyses of the plume are produced. The flow chart of programs for analysis of thermal imagery is presented and discussed in some detail.
    Keywords: COMPUTER OPERATIONS AND HARDWARE
    Type: Annual Meeting of American Society of Photogrammetry; Feb 22, 1976 - Feb 28, 1976; Washington, DC
    Format: text
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    NASA TECHNICAL REPORTS
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