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  • Journals
  • Other Sources  (28,920)
  • FLUID MECHANICS AND HEAT TRANSFER  (8,825)
  • SPACE RADIATION  (7,513)
  • Meteorology and Climatology  (6,758)
  • SPACECRAFT DESIGN, TESTING AND PERFORMANCE  (5,824)
Collection
  • Journals
  • Other Sources  (28,920)
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Keywords
Years
  • 1
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    SOLID PROPELLANT BOOSTERS FOR MANNED SPACE FLIGHT (1962)
    In:  CASI
    Details
    Publication Date: 2009-12-22
    Description: Solid propellant boosters for manned space flight
    Keywords: SPACE RADIATION
    Type: Proceedings of the National Meeting on Manned Space Flight: Unclassified Portion
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  • 2
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    Aspects of unstructured grids and finite-volume solvers for the Euler and Navier-Stokes equations (1994)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: Basic algorithms for unstructured mesh generation and fluid flow calculation are discussed. In particular the following are addressed: preliminaries of graphs and meshes; duality and data structures; basic graph operations important in CFD (Computational Fluid Dynamics); triangulation methods, including Varonoi diagrams and Delaunay triangulation; maximum principle analysis; finite volume schemes for scalar conservation law equations; finite volume schemes for the Euler and Navier-Stokes equations; and convergence acceleration for steady state calculations.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: VKI, Computational Fluid Dynamics, Volume 1; 141 p
    Format: text
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  • 3
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    Turbulence Detection and Mitigation Element (2003)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: This paper presents viewgraphs on turbulence detection and mitigation technologies in weather accident prevention. The topics include: 1) Organization; 2) Scope of Turbulence Effort; 3) Background; 4) Turbulence Detection and Mitigation Program Metrics; 5) Approach; 6) Turbulence Team Relationships; 7) WBS Structure; 8) Deliverables; 9) TDAM Changes; 10) FY-01 Results/Accomplishments; 11) Out-year Plans; and 12) Element Status.
    Keywords: Meteorology and Climatology
    Type: Proceedings of the Second NASA Aviation Safety Program Weather Accident Prevention Review; 73-90; NASA/CP-2003-210964
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  • 4
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    Aviation Weather Information Overview and Status (2003)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: This paper presents the weather accident prevention project review during the period of June 5, through June 7, 2001. The topics include: 1) Background; 2) Guidance; 3) Plan; 4) System Elements; 5) AWIN System; 6) Market Segments; 7) Technology Development Level; 8) Aviation Safety Program Organization; 9) Partnerships; 10) NASA Facilities; 11) Timeline; 12) AWIN Research Areas; and 13) Cooperative Research with FAA. This paper is in viewgraph form.
    Keywords: Meteorology and Climatology
    Type: Proceedings of the Second NASA Aviation Safety Program Weather Accident Prevention Review; 33-50; NASA/CP-2003-210964
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  • 5
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    Carbon dioxide warming of the early Earth (1997)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Svante Arrhenius' research in atmospheric physics extended beyond the recent past and the near future states of the Earth, which today are at the center of sociopolitical attention. His plan encompassed all of the physical phenomena known at the time to relate to the formation and evolution of stars and planets. His two-volume textbook on cosmic physics is a comprehensive synopsis of the field. The inquiry into the possible cause of the ice ages and the theory of selective wavelength filter control led Arrhenius to consider the surface states of the other terrestrial planets, and of the ancient Earth before it had been modified by the emergence of life. The rapid escape of hydrogen and the equilibration with igneous rocks required that carbon in the early atmosphere prevailed mainly in oxidized form as carbon dioxide, together with other photoactive gases exerting a greenhouse effect orders of magnitude larger than in our present atmosphere. This effect, together with the ensuing chemical processes, would have set the conditions for life to evolve on our planet, seeded from spores spreading through an infinite Universe, and propelled, as Arrhenius thought, by stellar radiation pressure.
    Keywords: Meteorology and Climatology
    Type: Ambio (ISSN 0044-7447); Volume 26; 1; 12-6
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  • 6
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    Finite difference solution for transient radiative cooling of a conducting semitransparent square region (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-12-09
    Description: Transient solutions were obtained for a square region of heat conducting semitransparent material cooling by thermal radiation. The region is in a vacuum environment, so energy is dissipated only by radiation from within the medium leaving through its boundaries. The effect of heat conduction during the transient is to partially equalize the internal temperature distribution. As the optical thickness of the region is increased, the temperature gradients increase near the boundaries and corners, unless heat conduction is large. The solution procedure must provide accurate temperature distributions in these regions to prevent error in the calculated radiation losses. Two-dimensional numerical Gaussian integration is used to obtain the local radiative source term. A finite difference procedure with variable space and time increments is used to solve the transient energy equation. Variable spacing was used to concentrate grid points in regions with large temperature gradients.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: International Journal of Heat and Mass Transfer (ISSN 0017-9310); 35; 10; p. 2579-2592.
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  • 7
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    Tropospheric sources of NOx: lightning and biology (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Laboratory experiments to quantify the global production of NOx (NO + NO2) in the troposphere due to atmospheric lightning and biogenic activity in soil are presented. These laboratory experiments, as well as other studies, suggest that the global production of NOx by lightning probably ranges between 2 and 20 MT(N)y-1 of NO and is strongly dependent on the total energy deposited by lightning, a quantity not well-known. In our laboratory experiments, nitrifying micro-organisms is soil were found to be a significant source of both NO and nitrous oxide (N2O). The measured production ratio of NO to N2O averaged 2-3 for oxygen partial pressures of 0.5-10%. Extrapolating these laboratory measurements to the global scale, which is somewhat risky, suggests that nitrifying micro-organisms in soil may account for as much as 10 MT(N) y-1 of NO. Additional experiments with denitrifying micro-organisms gave an NO to N2O production ratio ranging from 2 to 4 for an oxygen partial pressure of 0.5% and a ratio of less than unity for oxygen partial pressures ranging from 1 to 20%. The production of NO and N2O, normalized with respect to micro-organism number indicates that the production of both NO and N2O by denitrifying micro-organisms is at least an order of magnitude less than production by nitrifying micro-organisms for the micro-organisms studied.
    Keywords: Meteorology and Climatology
    Type: Atmospheric environment (ISSN 0004-6981); Volume 18; 9; 1797-804
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  • 8
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    Comments on the BLAG model: the carbonate-silicate geochemical cycle and its effect on atmospheric carbon dioxide over the past 100 million years (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A self-consistent method of determining initial conditions for the model presented by Berner, Lasaga, and Garrels (1983) (henceforth, the BLAG model) is derived, based on the assumption that the CO2 geochemical cycle was in steady state at t = -100 my (million years). This initialization procedure leads to a dissolved magnesium concentration higher than that calculated by Berner, Lasaga, and Garrels and to a low ratio of dissolved calcium to bicarbonate prior to 60 my ago. The latter prediction conflicts with the geologic record of evaporite deposits, which requires that this ratio remain greater than 0.5. The contradiction is probably caused by oversimplifications in the BLAG model, such as the neglect of the cycles of organic carbon and sulfur.
    Keywords: Meteorology and Climatology
    Type: American journal of science (ISSN 0002-9599); Volume 284; 1175-82
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  • 9
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    Selection of High Thrust Launch Vehicles (1962)
    In:  Other Sources
    Details
    Publication Date: 2011-08-26
    Description: Selection of high thrust launch vehicles
    Keywords: SPACE RADIATION
    Type: SAE PAPER-510A
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  • 10
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    Scanning Raman lidar measurements of atmospheric water vapor during a cold frontal passage (1995)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The NASA/Goddard Space Flight Center Scanning Raman Lidar (SRL) had a highly successful deployment at the Department of Energy Cloud and Radiation Testbed (CART) Site in Billings, OK during April, 1994 for the first Intensive Operation Period (IOP) hosted there. During the IOP, the SRL operated from just after sundown to just before sunrise for all declared evenings of operation. The lidar acquired more than 123 hours of data over 15 nights with less than 1 hour of data lost due to minor system malfunction. The SRL acquired data both on the vertical and in scanning mode toward an instrumented 60 m tower during various meteorological conditions such as an intense cold frontal passage on April 15 which is the focus of this presentation.
    Keywords: Meteorology and Climatology
    Type: Optical Remote Sensing of the Atmosphere, Volume 2; 209-211; LC-95-67220
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