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  • Other Sources  (23)
  • 1995-1999  (23)
  • 1990-1994
  • 1960-1964
  • 1945-1949
  • 1995  (23)
  • 1
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    UV/VIS-absorption Spectra of HOBr and CH3OBr; Br(2P3/2) Atom Yields in the Photolysis of HOBr (1995)
    Bunsengesellschaft für Physikalische Chemie
    In:  Berichte der Bunsengesellschaft für Physikalische Chemie, 99 . pp. 1144-1147.
    Details
    Publication Date: 2020-06-16
    Type: Article , PeerReviewed
    Format: text
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    PAPER (OCEANREP)
  • 2
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    UV/VIS-absorption Spectra of HOBr and CH3OBr; Br(2P3/2) Atom Yields in the Photolysis of HOBr (1995)
    In:  [Poster] In: 5. Statusseminar des Ozonforschungsprogramms, 22.06.-23.06.1995, Bonn, Germany .
    Details
    Publication Date: 2019-02-05
    Description: Gas phase UV/VIS‐absorption spectra are reported for HOBr and CH3OBr in the wavelength range (230 〈 λ 〈 400)nm. The quantum yield for Br(2P3/2) atom generation was determined to be ≥0.95 in the laser photolysis of HOBr at λ = 363 nm.
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 3
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    Considerations for modeling thin cirrus effects via brightness temperature differences (1995)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Brightness temperature difference (BTD) values are calculated for selected Geostationary Operational Environmental Satellite (GOES-6) channels (3.9, 12.7 micrometer) and Advanced Very High Resolution Radiometer channels (3.7, 12.0 micrometer). Daytime and nighttime discrimination of particle size information is possible given the infrared cloud extinction optical depth and the BTD value. BTD values are presented and compared for cirrus clouds composed of equivalent ice spheres (volume, surface area) versus randomly oriented hexagonal ice crystals. The effect of the hexagonal ice crystals is to increase the magnitude of the BTD values calculated relative to equivalent ice sphere (volume, surface area) BTDs. Equivalent spheres (volume or surface area) do not do a very good job of modeling hexagonal ice crystal effects on BTDs; however, the use of composite spheres improves the simulation and offers interesting prospects. Careful consideration of the number of Legendre polynomial coefficients used to fit the scattering phase functions is crucial to realistic modeling of cirrus BTDs. Surface and view-angle effects are incorporated to provide more realistic simulation.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Journal of Applied Meteorology (ISSN 0894-8763); 34; 2; p. 447-459
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    NASA TECHNICAL REPORTS
  • 4
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    Network time synchronization servers at the US Naval Observatory (1995)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Responding to an increased demand for reliable, accurate time on the Internet and Milnet, the U.S. Naval Observatory Time Service has established the network time servers, tick.usno.navy.mil and tock.usno.navy.mil. The system clocks of these HP9000/747i industrial work stations are synchronized to within a few tens of microseconds of USNO Master Clock 2 using VMEbus IRIG-B interfaces. Redundant time code is available from a VMEbus GPS receiver. UTC(USNO) is provided over the network via a number of protocols, including the Network Time Protocol (NTP) (DARPA Network Working Group Report RFC-1305), the Daytime Protocol (RFC-867), and the Time protocol (RFC-868). Access to USNO network time services is presently open and unrestricted. An overview of USNO time services and results of LAN and WAN time synchronization tests will be presented.
    Keywords: PHYSICS (GENERAL)
    Type: NASA. Goddard Space Flight Center, The 26th Annual Precise Time and Time Interval (PTTI) Applications and Planning Meeting; p 175-183
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    NASA TECHNICAL REPORTS
  • 5
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    The Strategic Technologies for Automation and Robotics (STEAR) program: Protection of materials in the space environment subprogram (1995)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Three projects are currently underway for the development of new coatings for the protection of materials in the space environment. These coatings are based on vacuum deposition technologies. The projects will go as far as the proof-of-concept stage when the commercial potential for the technology will be demonstrated on pilot-scale fabrication facilities in 1996. These projects are part of a subprogram to develop supporting technologies for automation and robotics technologies being developed under the Canadian Space Agency's STEAR Program, part of the Canadian Space Station Program.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA. Langley Research Center, LDEF: 69 Months in Space. Third Post-Retrieval Symposium, Part 3; p 1341-1359
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  • 6
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    Chlorine Partitioning in the Arctic Vortex During Winter 1995 Derived From Submillimeterwave Remote Sensing and in Situ Constituent Measurements (1995)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: High altitude balloon flights of a combined payload of the Submillimeterwave Limb Sounder and the whole air sampler instruments were performed on 27 January 1995 and 08 March 1995. Both flights were launched from sweden as part of the Second European Stratospheric Arctic and Mid-latitude Experiment (SESAME). Results of the first flight suggest that most of the available chlorine had been converted to CLOx in the observed air parcel, while warmer air in the second flight had much more HCl than CLOx.
    Keywords: Earth Resources and Remote Sensing
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    NASA TECHNICAL REPORTS
  • 7
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    Asteroid entry in Venusian atmosphere: Pressure and density fields effect on crater formation (1995)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The objectives are to look at time scales of overpressure compared to cratering and to determine: what are the transient pressure and density due to atmospheric entry; do shock waves evacuate ambient gas; do transient atmospheric disturbances 'settle down' during cratering; can the pressure/density field be approximated as quasi-static; how does disturbance scale with impactor size; and what is the role of atmospheric thickness. The general approach is to perform inexpensive exploratory calculations, perform experiments to validate code and observe crater growth, and to follow up with more realistic coupling calculations. This viewgraph presentation presents progress made with the objective to obtain useful scaling relationships for crater formation when atmospheric effects are important.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CR-199155 , NAS 1.26:199155
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  • 8
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    Thermocapillary flow with evaporation and condensation at low gravity. Part 2: Deformable surface (1995)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The free surface behavior of a volatile wetting liquid at low gravity is studied using scaling and numerical techniques. An open cavity model, which was applied in part 1 to investigate fluid flow and heat transfer in non-deforming pores, is used to evaluate the influence of convection on surface morphology with length scales and subcooling/superheating limits of 1 less than or equal to D less than or equal to 10(exp 2) microns and approximately 1 K, respectively. Results show that the menisci shapes of highly wetting fluids are sensitive to thermocapillary flow and to a lesser extent the recoil force associated with evaporation and condensation. With subcooling, thermocapillarity produces a suction about the pore centerline that promotes loss of mechanical equilibrium, while condensation exerts an opposing force that under some conditions offsets this destabilizing influence. With superheating, thermocapillarity and evaporation act in the same direction and mutually foster surface stability. All of these trends are magnified by high capillary and Biot numbers, and the stronger circulation intensities associated with small contact angles. These phenomena strongly depend on the thermal and interfacial equilibrium between the liquid and vapor, and have important ramifications for systems designed to maintain a pressure differential across a porous surface.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-111221 , NAS 1.15:111221 , NIPS-96-07300
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    NASA TECHNICAL REPORTS
  • 9
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    Off-design computer code for calculating the aerodynamic performance of axial-flow fans and compressors (1995)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An off-design axial-flow compressor code is presented and is available from COSMIC for predicting the aerodynamic performance maps of fans and compressors. Steady axisymmetric flow is assumed and the aerodynamic solution reduces to solving the two-dimensional flow field in the meridional plane. A streamline curvature method is used for calculating this flow-field outside the blade rows. This code allows for bleed flows and the first five stators can be reset for each rotational speed, capabilities which are necessary for large multistage compressors. The accuracy of the off-design performance predictions depend upon the validity of the flow loss and deviation correlation models. These empirical correlations for the flow loss and deviation are used to model the real flow effects and the off-design code will compute through small reverse flow regions. The input to this off-design code is fully described and a user's example case for a two-stage fan is included with complete input and output data sets. Also, a comparison of the off-design code predictions with experimental data is included which generally shows good agreement.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA-CR-198362 , E-9764 , NAS 1.26:198362
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  • 10
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    Are Event Traces Really That Necessary? (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: Many performance monitoring tools are currently available to the super-computing community. The performance data gathered and analyzed by these tools fall under two categories: statistics and event traces. Statistical data is much more compact but lack the probative power event traces offer. Event traces, on the other hand, can easily fill up the entire file system during execution such that the instrumented execution have to be terminated. In this paper, we propose an innovative methodology for monitoring and trace representation that offers a middle ground. The user can trace-off trace data size vs. quality incrementally. Specifically, the user will be able to limit the amount of trace collected and, at the same time, carry out some of the analysis event traces offer for the entire execution. With the help of a few CFD examples, we illustrate the use of our technique in performance tuning. We also compare quantitatively, the quality of the traces we collected vs. event traces.
    Keywords: Computer Systems
    Type: 1st SIGMETRICS Symposium on Parallel and Distributed Tools; May 22, 1996 - May 23, 1996; Philadelphia, PA; United States
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