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  • 1
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    The Heat Capacity of Cu(NO3)2·2.5H2O at Low Temperatures (1968)
    American Institute of Physics
    Details
    Publication Date: 1968-02-01
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 2
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    Heat Capacity of FeCl2·4H2O between 0.4 and 5.3 K (1972)
    American Physical Society
    Details
    Publication Date: 1972-12-01
    Print ISSN: 0556-2805
    Topics: Physics
    Published by American Physical Society
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    PAPER CURRENT
  • 3
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    Heat Capacity of Mn(CH3COO)2·4H2O between 0.4 and 20°K (1968)
    American Physical Society
    Details
    Publication Date: 1968-12-10
    Print ISSN: 0031-899X
    Electronic ISSN: 1536-6065
    Topics: Physics
    Published by American Physical Society
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    PAPER CURRENT
  • 4
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    Ka-band MMIC microstrip array for high rate communications (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: In a recent technology assessment of alternative communication systems for the space exploration initiative (SEI), Ka-band (18 to 40 GHz) communication technology was identified to meet the mission requirements of telecommunication, navigation, and information management. Compared to the lower frequency bands, Ka-band antennas offer higher gain and broader bandwidths; thus, they are more suitable for high data rate communications. Over the years, NASA has played an important role in monolithic microwave integrated circuit (MMIC) phased array technology development, and currently, has an ongoing contract with Texas Instrument (TI) to develop a modular Ka-band MMIC microstrip subarray (NAS3-25718). The TI contract emphasizes MMIC integration technology development and stipulates using existing MMIC devices to minimize the array development cost. The objective of this paper is to present array component technologies and integration techniques used to construct the subarray modules.
    Keywords: COMMUNICATIONS AND RADAR
    Type: AIAA PAPER 91-3421
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Coordinated aircraft and ship surveys for determining impact of river inputs on great lakes waters. Remote sensing results (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The remote sensing results of aircraft and ship surveys for determining the impact of river effluents on Great Lakes waters are presented. Aircraft multi-spectral scanner data were acquired throughout the spring and early summer of 1976 at five locations: the West Basin of Lake Erie, Genesee River - Lake Ontario, Menomonee River - Lake Michigan, Grand River - Lake Michigan, and Nemadji River - Lake Superior. Multispectral scanner data and ship surface sample data are correlated resulting in 40 contour plots showing large-scale distributions of parameters such as total suspended solids, turbidity, Secchi depth, nutrients, salts, and dissolved oxygen. The imagery and data analysis are used to determine the transport and dispersion of materials from the river discharges, especially during spring runoff events, and to evaluate the relative effects of river input, resuspension, and shore erosion. Twenty-five LANDSAT satellite images of the study sites are also included in the analysis. Examples of the use of remote sensing data in quantitatively estimating total particulate loading in determining water types, in assessing transport across international boundaries, and in supporting numerical current modeling are included. The importance of coordination of aircraft and ship lake surveys is discussed, including the use of telefacsimile for the transmission of imagery.
    Keywords: ENVIRONMENT POLLUTION
    Type: NASA-TP-1694 , E-172
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Monte Carlo analysis of lobular gas-surface scattering in tubes applied to thermal transpiration (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A model of rarefied gas flow in tubes was developed which combines a lobular distribution with diffuse reflection at the wall. The model with Monte Carlo techniques was used to explain previously observed deviations in the free molecular thermal transpiration ratio which suggest molecules can have a greater tube transmission probability in a hot-to-cold direction than in a cold-to-hot direction. The model yields correct magnitudes of transmission probability ratios for helium in Pyrex tubing (1.09 to 1.14), and some effects of wall-temperature distribution, tube surface roughness, tube dimensions, gas temperature, and gas molecular mass.
    Keywords: CHEMISTRY
    Type: NASA-TN-D-6700 , E-6591
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Application of thermal imagery to the development of a Great Lakes ice information system (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Recent measurements and analysis have shown that thermal infrared imagery (wavelength, 8-14 microns) can be employed to delineate the relative thicknesses of various regions of freshwater ice, as well as, differentiate new ice from both open water areas and thicker (young)ice. Thermal imagery was observed to be generally superior to visual (0.4 - 0.7 microns) and our SLAR (3.3 cm) imagery for estimating relative ice thicknesses and delineating open water from new ice growth. In a real-time Great Lakes Ice Information System, thermal imagery can not only provide supplementary imagery but also aid in developing interpretative methods for all-weather SLAR imagery, as well as, establishing the areal extent of spot thickness measurements.
    Keywords: GEOPHYSICS
    Type: NASA-TM-X-71478 , Interdisciplinary Symp. on Advanced Concepts and Tech. in the Study of Snow and Ice Resources; Dec 02, 1973 - Dec 06, 1973; Monterey, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Effect of thruster pulse length on thruster-exhaust damage of S13G white thermal control coatings (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Rocket exhaust products which strike thermal control surfaces cause changes in solar absorptance (Alpha Sub s) and thermal emittance (Epsilon) of these surfaces. A study was made of the effect of rocket pulse duration on exhaust damage to S13G white coatings. Two pulse lengths were used - 14 msec and 50 msec. An MMH/N204 bipropellant 5-lb thrust rocket was fired into a simulated space environment with a vacuum of 0.00001 torr, a liquid helium temperature enclosure, and solar radiation. The changes in solar absorptance and thermal emittance of S13G white coatings due to rocket exhaust were made in-situ for total firing times of 58 seconds with 14 msec pulses and 223.7 sec with 50 msec pulses. The solar absorptance of S13G increased 25 percent due to 223.7 sec of exposure to 50 msec pulses and the thermal emittance was unaffected. The ratio of Alpha Sub s/Epsilon therefore increased by 25 percent. The short 14 msec pulse exhaust exposure caused between 40 and 70 percent increase in solar absorptance and a decrease of between 13 and 18 percent in thermal emittance. The corresponding increase in Alpha Sub s/Epsilon ratio was between 80 and 100 percent. Ultraviolet radiation was present in the short pulse test and may have contributed to the large damage of that test.
    Keywords: THERMODYNAMICS AND COMBUSTION
    Type: NASA-TM-X-68213 , E-7361 , JANNAF Plume Technol. Conf.; Apr 03, 1973 - Apr 05, 1973; Redstone Arsenal, AL; United States
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    NASA TECHNICAL REPORTS
  • 9
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    Optical properties of thermal control coatings contaminated by MMH/N2O4 5-pound thruster in a vacuum environment with solar simulation. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Cat-a-lac Black and S13G thermal control coatings were exposed to the exhaust of a thrustor in a simulated space environment. Vacuum was maintained at less than 10 microtorr during thrustor firing in the liquid helium cooled facility. The thrustor was fired in a 50-millisecond pulse mode, and the accumulated firing time was 224 seconds. Solar absorptance and thermal emittance of the coatings were measured in-situ at intervals of 300 pulses, using a calorimetric technique. The Cat-a-lac Black coatings showed no change in solar absorptance or thermal emittance. The S13G showed up to 25% increase in solar absorptance but no change in thermal emittance.
    Keywords: PHYSICS, GENERAL
    Type: AIAA PAPER 72-263 , American Institute of Aeronautics and Astronautics, Thermophysics Conference; Apr 10, 1972 - Apr 12, 1972; San Antonio, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    System-level integrated circuit (SLIC) development for phased array antenna applications (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: A microwave/millimeter wave system-level integrated circuit (SLIC) being developed for use in phased array antenna applications is described. The program goal is to design, fabricate, test, and deliver an advanced integrated circuit that merges radio frequency (RF) monolithic microwave integrated circuit (MMIC) technologies with digital, photonic, and analog circuitry that provide control, support, and interface functions. As a whole, the SLIC will offer improvements in RF device performance, uniformity, and stability while enabling accurate, rapid, repeatable control of the RF signal. Furthermore, the SLIC program addresses issues relating to insertion of solid state devices into antenna systems, such as the reduction in number of bias, control, and signal lines. Program goals, approach, and status are discussed.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: In: Monolithic microwave integrated circuits for sensors, radar, and communications systems; Proceedings of the Meeting, Orlando, FL, Apr. 2-4, 1991 (A93-25776 09-33); p. 204-209.
    Format: text
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