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  • Chemistry  (9,555)
  • General Chemistry  (1,242)
  • Cell & Developmental Biology  (1,180)
  • GEOPHYSICS  (755)
  • AERODYNAMICS  (671)
  • 1985-1989  (12,161)
  • 1989  (12,161)
Collection
Keywords
Publisher
Years
  • 1985-1989  (12,161)
Year
  • 1
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    Global Climate Study (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The Global Surface Radiation Budget Experiment, which determines if current climate models are accurate, is explained.
    Keywords: GEOPHYSICS
    Type: ASR-250 , NASA-TM-109612 , NONP-NASA-VT-93-190410
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Iridium in the Vredefort Bronzite Granophyre - Impact melting and limits on a possible extraterrestrial component (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The Bronzite Granophyre was analyzed for Ir and other elements to examine whether its origin was due to impact melting or conventional igneous assimilation and to search for a possible extraterrestrial component in the melt. No such component is identified. Ir values range from 50-130 pg/g, equivalent to less than 0.05 percent C1 material. Further evidence against an extraterrestrial source of siderophiles are the low Ir/Au ratios and the absence of systematic correlations between Ir and other elements. However, the Granophyre is significantly enriched in Ir over other Vredefort granitic rocks, implying a fundamental difference between them. Geochemical mixing models indicate that the Ir observed in the Granophyre can be supplied from high-Ir local shales and quartzites during an impact melting event. The results are consistent with the view that the Granophyre is an impact melt and that Vredefort is an impact structure.
    Keywords: GEOPHYSICS
    Type: Lunar and Planetary Science Conference; Mar 14, 1988 - Mar 18, 1988; Houston, TX; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The planning and execution of ER-2 and DC-8 aircraft flights over Antarctica, August and September 1987 (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The significant ozone loss in the lower stratosphere over Antarctica during recent austral springs was studied by instrumented ER-2 and DC-8 aircraft. Data on the homogeneous gas composition, polar stratospheric clouds, and on tracers for dynamic motion are provided. The mission design is described, the aircraft and their payloads are documented, and the flight tracks are specified.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 94; 11181-11
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The role of NASA in geodynamics research - Past and future (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: NASA participation in geophysics and geodynamics studies is addressed. Recent NASA activities in these areas are reviewed and plans and suggestions for the future are outlined. International cooperative activities in geophysics and geodynamics are briefly examined. New technologies that will be applied are considered.
    Keywords: GEOPHYSICS
    Type: EOS (ISSN 0096-3941); 70; 713
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    NASA TECHNICAL REPORTS
  • 5
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    High-alpha aerodynamic characteristics of crescent and elliptic wings (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: Static longitudinal and lateral-directional forces and moments were measured for elliptic- and crescent-wing models at high angles of attack in the NASA Langley 14-by-22-ft Subsonic Tunnel. The forces and moments were obtained for an angle-of-attack range including stall and post-stall conditions at a Reynolds number based on the average wing chord of about 1.8 million. Flow-visualization photographs using a mixture of oil and titanium-dioxide were also taken for several incidence angles. The force and moment data and the flow-visualization results indicated that the crescent wing model with its highly swept tips produced much better high-angle-of-attack aerodynamic characteristics than the elliptic model. Leading-edge separation-induced vortex flow over the highly swept tips of the crescent wing is thought to produce this improved behavior at high angles of attack. The unique planform design could result in safer and more efficient low-speed airplanes.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 89-2240 , AIAA Applied Aerodynamics Conference; Jul 31, 1989 - Aug 02, 1989; Seattle, WA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    NASA's CFD Validation Program (1989)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: With computational fluid dynamics (CFD) becoming a productive research and design tool, the requirement to validate CFD codes has grown significantly. NASA had emphasized CFD validation activities since 1986 when a separate work element was formed to fund experimental activities related to validation. NASA's CFD and CFD validation programs are closely coordinated to ensure that experimental data bases are available as soon as possible for validating codes. In response to industry and academic requirements, four levels of experimental research have been defined as part of CFD validation with NASA's Aeronautics Advisory Committee (AAC) support although only the fourth level actually has the detailed information necessary for validating codes. Critical flow physics especially turbulence modeling are key to improved CFD codes. NASA has focused additional resources on transition and turbulence physics to meet these requirements. With improved turbulence models, CFD codes will be more accurate, robust, and efficient. However, with the level of detailed information available from CFD codes, highly accurate and detailed experiments are required to capture the critical information for validating codes. Advanced instrumentation especially non-intrusive instrumentation is required to acquire this information in validation experiments. The CFD validation program is being coordinated and managed to address these critical activities. A list of experiments which are currently being supported at least partially are included.
    Keywords: AERODYNAMICS
    Type: NASA, Ames Research Center, NASA Computational Fluid Dynamics Conference. Volume 1: Sessions 1-6; p 123-134
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    A study of the effect of synoptic scale processes in GCM modelling (1989)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: Research was conducted to help modeling groups at NASA to develop better weather forecasting and general circulation models (GCM) for activities relating to the meteorological uses of satellite data. The focus was on the physical processes that were being simulated by models: radiative effects and latent heat release associated with clouds; orographic influences; and heat transfer at the ocean and ice surfaces. An attempt was made to deduce the role of diabatic heating in North Atlantic cyclogenesis and in the global heat budget. Inferences were made in four studies: heat budget statistics from GCM assimilations; dynamics of north Atlantic cyclones; Cage-type energy budget calculations; and grid scale cloud formation. Mechanisms that were responsible for the variability and structure of the atmospheric on a hemispheric scale were studied by a hybrid of statistical analysis and theoretical modeling. Variability and structure are both related to synoptic scale processes through baroclinic and barotropic energy transformations.
    Keywords: GEOPHYSICS
    Type: NASA-CR-184804 , NAS 1.26:184804
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Comparison of satellite-derived dynamical quantities for the stratosphere of the Southern Hemisphere (1989)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: As part of the international Middle Atmosphere Program (MAP), a project was instituted to study the dynamics of the Middle Atmosphere in the Southern Hemisphere (MASH). A pre-MASH workshop was held with two aims: comparison of Southern Hemisphere dynamical quantities derived from various archives of satellite data; and assessing the impact of different base-level height information on such derived quantities. The dynamical quantities examined included geopotential height, zonal wind, potential vorticity, eddy heat and momentum fluxes, and Eliassen-Palm fluxes. It was found that while there was usually qualitative agreement between the different sets of fields, substantial quantitative differences were evident, particularly in high latitudes. The fidelity of the base-level analysis was found to be of prime importance in calculating derived quantities - especially the Eliassen-Palm flux divergence and potential vorticity. Improvements in base-level analyses are recommended. In particular, quality controls should be introduced to remove spurious localized features from analyses, and information from all Antarctic radiosondes should be utilized where possible. Caution in drawing quantitative inferences from satellite data for the middle atmosphere of the Southern Hemisphere is advised.
    Keywords: GEOPHYSICS
    Type: NASA-CP-3044 , L-16593 , NAS 1.55:3044 , Workshop on the Middle Atmosphere in the Southern Hemisphere; Apr 14, 1986 - Apr 17, 1986; Williamsburg, VA; United States
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    NASA TECHNICAL REPORTS
  • 9
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    Two-Dimensional Intercomparison of Stratospheric Models (1989)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: A detailed record is provided for the examination of fundamental differences in photochemistry and transport among atmospheric models. The results of 16 different modeling groups are presented for several model experiments.
    Keywords: GEOPHYSICS
    Type: NASA-CP-3042 , REPT-89B00192 , NAS 1.55:3042 , Sep 11, 1988 - Sep 16, 1988; Virginia Beach, VA; United States
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    NASA TECHNICAL REPORTS
  • 10
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    Transonic Symposium: Theory, Application, and Experiment, volume 1, part 2 (1989)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: In order to assess the state of the art in transonic flow disciplines and to glimpse at future directions, NASA-Langley held a Transonic Symposium. Emphasis was placed on steady, three dimensional external, transonic flow and its simulation, both numerically and experimentally. The symposium included technical sessions on wind tunnel and flight experiments; computational fluid dynamic applications; inviscid methods and grid generation; viscous methods and boundary layer stability; and wind tunnel techniques and wall interference. This, being volume 1, is unclassified.
    Keywords: AERODYNAMICS
    Type: NASA-CP-3020-VOL-1-PT-2 , L-16501-VOL-1-PT-2 , NAS 1.55:3020-VOL-1-PT-2 , Apr 19, 1988 - Apr 21, 1988; Hampton, VA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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