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  • 1
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    Alterations in transthoracic electrical impedance with acute intravascular overload (1969)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Alterations in transthoracic electrical impedance with acute intravascular overload and pulmonary edema
    Keywords: BIOSCIENCES
    Type: MINN. UNIV. DEVELOP. AND EVALUATION OF AN IMPEDANCE CARDIOGRAPHIC SYSTEM TO MEAS. CARDIAC OUTPUT AND OTHER CARDIAC PARAMETERS 30 JUN. 1969; P 78-96
    Format: text
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  • 2
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    Photon-counting image sensors for the ultraviolet (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An investigation on specific performance details of photon counting, ultraviolet image sensors having 2-dimensional formats is reviewed. In one study, controlled experiments were performed which compare the quantum efficiencies, in pulse counting mode, of CsI photocathodes deposited on: (1) the front surface of a microchannel plate (MCP), (2) a solid surface in front of an MCP, and (3) an intensified CCD image sensor (ICCD) where a CCD is directly bombarded by accelerated photoelectrons. Tests indicated that the detection efficiency of the CsI-coated MCP at 1026 A is lower by a factor of 2.5 than that of the MCP with a separate, opaque CsI photocathode, and the detection efficiency ratio increases substantially at longer wavelengths (ratio is 5 at 1216 A and 20 at 1608 A).
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-176062 , NAS 1.26:176062
    Format: application/pdf
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  • 3
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    Spectrophotometric results from the Copernicus satellite. I - Instrumentation and performance. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The Princeton telescope-spectrometer on the OAO spacecraft Copernicus scans stellar spectra with a resolution of about 0.05 A between 950 and 1450 A, and twice this in first order between 1650 and 3000 A. The pointing during several minutes is steady within .02 sec, and the measured photometric precision in the shorter wavelength range is limited only by the statistics of photon counts, with 14-sec counts of about 1000 on an unreddened B1 star, m(v) = 5.0, at 1100 A. In the 1650-3000 A wavelength range, phototube noise resulting from cosmic rays makes observations difficult on stars fainter than m(v) = 3.0.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Astrophysical Journal; 181; May 1
    Format: text
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  • 4
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    Echelle spectroscopy with a charge-coupled device /CCD/ (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The recent availability of large format CCD's with high quantum efficiency makes it possible to achieve significant advances in high dispersion astronomical spectroscopy. An echelle CCD combination excels or equals other techniques presently available, and offers the advantage of complete spectral coverage of several thousand Angstroms in a single exposure. Attention is given to experiments which were conducted with a CCD camera head and an echelle spectrograph on a 4-meter telescope. It was found possible to achieve a signal-to-noise ratio of 150/1 on a 13th magnitude star at 6000 A in a two-hour exposure at 0.16 A/pixel, limited primarily by photon statistics. For fainter objects, readout noise is the limiting factor in precision. For 20 electron rms readout noise, an S/N = 15/1 at 18th magnitude is expected, all other things being equal.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Solid state imagers for astronomy; June 10, 11, 1981; Cambridge, MA
    Format: text
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  • 5
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    Performance of and planned improvements to a mountain altitude cosmic ray mass spectrometer (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A cosmic ray mass spectrometer with superconducting magnet, wire spark chambers, and time-of-flight scintillation counters has been operated at an altitude of 2750 meters. Various specifications of the spectrometer are presented and the method of event analysis described. Corrections to the data, resolutions and efficiencies of the spark chambers, and momentum resolution are discussed. Recent and planned improvements of the apparatus are indicated.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: International Cosmic Ray Conference; Aug 15, 1975 - Aug 29, 1975; Munich
    Format: text
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