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  • PLASMA PHYSICS  (21)
  • ENERGY PRODUCTION AND CONVERSION  (10)
  • Alpha and Beta cells  (1)
  • Bone marrow  (1)
Collection
Keywords
Publisher
Years
  • 1
    Electronic Resource
    Electronic Resource
    Variations in mineral apposition rate of trabecular bone within the beagle skeleton (1981)
    Springer
    Calcified tissue international 33 (1981), S. 583-586 
    Details
    ISSN: 1432-0827
    Keywords: Tetracycline ; Trabecular bone ; Mineral apposition rate ; Bone marrow ; Vascularity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary The mineral apposition rate of trabecular bone was determined in several skeletal sites of young adult beagles. Tetracycline derivatives were administered intravenously or orally on 2 separate occasions preceding the day of sacrifice in order to label actively mineralizing bone surfaces. The rate of mineral apposition was calculated by dividing the distance between the 2 tetracycline markers by the time interval between their administration. The lumbar vertebra, proximal humerus, and pelvis, each of which contains red marrow, were found to have a significantly higher (P〈0.001) rate of mineral apposition in trabecular bone than the skeletal sites containing yellow marrow—the proximal ulna and distal humerus. The mean apposition rate in the former 3 sites was 1.3±0.3µm/day, while that in the latter 2 was 0.9±0.2µm/day (uncorrected for plane of sectioning). It is tempting to speculate that this finding may be a consequence of differences in vascularity between red and yellow marrow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02409495
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Light and electron microscopy of the hepatopancreas of the isopod Acellus intermedius (1975)
    Springer
    Cell & tissue research 163 (1975), S. 403-410 
    Details
    ISSN: 1432-0878
    Keywords: Hepatopancreas ; Isopod ; Alpha and Beta cells ; Light and electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Hepatopancreas from Acellus intermedius, a small freshwater isopod, was examined by light and electron microscopy. Of particular interest are the two cell types present in the hepatopancreas. Their ultrastructural features indicate that the major role of the large alpha cells is to absorb material from the lumen as well as secrete materials into the lumen while the major role of the small beta cells is to store the absorbed materials as well as break down stored materials before transport.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00219474
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    Paper (German National Licenses)
    Fulltext
  • 3
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    End region effects upon the performance of a magnetohydrodynamic channel (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: (Previously cited in issue 06, p. 945, Accession no. A82-17889)
    Keywords: PLASMA PHYSICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    NASA Lewis Research Center combustion MHD experiment (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: The MHD power generation experiments were conducted in a high field strength cryomagnet which was adapted from an existing facility. In its original construction, it consisted of 12 high purity aluminum coils pool cooled in a bath of liquid neon. In this configuration, a peak field of 15 tesla was produced. For the present experiments, the center four coils were removed and a 23 cm diameter transverse warm bore tube was inserted to allow the placement of the MHD experiment between the remaining eight coils. In this configuration, a peak field of 6 tesla should be obtainable. The time duration of the experiment is limited by the neon supply which allows on the order of 1 minute of total operating time followed by an 18-hour reliquefaction period. As a result, the experiments are run in a pulsed mode. The run duration for the data presented here was 5 sec. The magnetic field profile along the MHD duct is shown. Since the working fluid is in essence superheated steam, it is easily water quenched at the exit of the diffuser and the components are designed vacuum tight so that the exhaust pipe and demister an be pumped down to simulate the vacuum of outer space.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: R and D Associates Proc. of the AFOSR Spec. Conf. on Prime-Power for High Energy Space Systems, Vol. 1; 10 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Quantitative analysis of defects in silicon. Silicon sheet growth development for the large are silicon sheet task of the low-cost solar array project (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: One hundred and seventy four silicon sheet samples were analyzed for twin boundary density, dislocation pit density, and grain boundary length. Procedures were developed for the quantitative analysis of the twin boundary and dislocation pit densities using a QTM-720 Quantitative Image Analyzing system. The QTM-720 system was upgraded with the addition of a PDP 11/03 mini-computer with dual floppy disc drive, a digital equipment writer high speed printer, and a field-image feature interface module. Three versions of a computer program that controls the data acquisition and analysis on the QTM-720 were written. Procedures for the chemical polishing and etching were also developed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-163140 , MRI-276 , DOE/JPL-954977-79/9
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Analysis of defect structure in silicon. Silicon sheet growth development for the large area silicon sheet task of the Low-Cost Solar array Project (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: One hundred ninety-three silicon sheet samples, approximately 880 square centimeters, were analyzed for twin boundary density, dislocation pit density, and grain boundary length. One hundred fifteen of these samples were manufactured by a heat exchanger method, thirty-eight by edge defined film fed growth, twenty-three by the silicon on ceramics process, and ten by the dendritic web process. Seven solar cells were also step-etched to determine the internal defect distribution on these samples. Procedures were developed or the quantitative characterization of structural defects such as dislocation pits, precipitates, twin & grain boundaries using a QTM 720 quantitative image analyzing system interfaced with a PDP 11/03 mini computer. Characterization of the grain boundary length per unit area for polycrystalline samples was done by using the intercept method on an Olympus HBM Microscope.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-169058 , DOE/JPL-955676-1 , JPL-9950-677 , NAS 1.26:169058 , MRI-289
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Results and comparison of Hall and DW duct experiments (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Experimental data from recent tests of a 45 deg diagonal wall duct are presented and compared with the results of a similar Hall duct. It is shown that while the peak power density of the two devices is approximately equal that the diagonal wall duct produces greater total power output due to its ability to better utilize the available magnetic field.
    Keywords: PLASMA PHYSICS
    Type: NASA-TM-82864 , DOE/NASA/10769-25 , E-1233 , NAS 1.15:82864
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Temperature distributions of a cesium-seeded hydrogen-oxygen supersonic free jet (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The hydrogen-oxygen plasma was generated at combustion chamber pressures ranging from 0.5 to 2.0 megapascals and for various seed ratios (1 to 10 percent). The plasma was observed as the atmospheric exhaust from a Mach 2 rocket test facility. Transverse profiles of the absolute integrated intensity were measured with the optically thin CsI lines (0.5664 and 0.5636 microns) at a range of axial positions downstream of the 5-cm-diameter combustor nozzle exit. Radial profiles of the emission coefficient were obtained from the measured transverse profiles of intensity by Abel inversion. Temperatures were then determined from the emission coefficients for conditions of local thermodynamic equilibrium using particle densities generated by a two-dimensional free jet computer program. Temperature results show the inherent effects of compression and expansion pressure waves characteristic of a free jet exiting from a supersonic nozzle.
    Keywords: PLASMA PHYSICS
    Type: NASA-TP-1162 , E-9267
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Velocity and temperature distributions of coal-slag layers on magnetohydrodynamic generators walls (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Approximate analytical expressions are derived for the velocity and temperature distributions in steady state coal slag deposits flowing over MHD generator walls. Effects of slag condensation and Joule heating are included in the analysis. The transport conditions and the slag temperature at the slag-gas interface are taken to be known parameters in the formulation. They are assumed to have been predetermined either experimentally or from the slag properties and the gas dynamic calculations of the free stream flow. The analysis assumes a power law velocity profile for the slag and accounts for the coupling between the energy and momentum conservation equations. Comparisons are made with the more exact numerical solutions to verify the accuracy of the results.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TN-D-8396 , E-8929
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    End region and current consolidation effects upon the performance of an MHD channel for the ETF conceptual design (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The effects of MHD channel end regions on the overall power generation were considered. The peak plant thermodynamic efficiency was found to be slightly lower than for the active region (41%). The channel operating point for the peak efficiency was shifted to the supersonic mode (Mach No., M sub c approx. 1.1) rather than the previous subsonic operation (M sub c approx. 0.9). The sensitivity of the channel performance to the B-field, diffuser recovery coefficient, channel load parameter, Mach number, and combustor pressure is also discussed. In addition, methods for operating the channel in a constant-current mode are investigated. This mode is highly desirable from the standpoint of simplifying the current and voltage consolidation for the inverter system. This simplification could result in significant savings in the cost of the equipment. The initial results indicate that this simplification is possible, even under a strict Hall field constraint, with resonable plant thermodynamic efficiency (40.5%).
    Keywords: PLASMA PHYSICS
    Type: NASA-TM-82744 , DOE/NASA/10769-22 , E-1057 , Aerospace Sci. Conf.; Jan 11, 1982 - Jan 14, 1982; Orlando, FL; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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