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  • 1
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    Elemental composition before, during and after the January 6, 1997, CME event measured by CELIAS/SOHO (1997)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: Using solar wind particle data from the charge, element and isotope analysis system (CELIAS) experiment on the SOHO mission, densities of the elements O, Ne, Mg, Si, S, Ca, and Fe are derived, and their abundance is analyzed before, during and after the 6 Janaury 1997 coronal mass ejection event (CME). In the interstream and coronal hole regions before and after this event, typical solar wind abundances for the elements investigated were found. However, during the passage of the coronal mass ejection and during the passage of the erupted filament, the elemental composition differed markedly from typical solar wind. For the passage of the CME and for the passage of the erupted filament, a mass-dependent enhancement of the elements was found, with a monotonic increase towards heavier elements. Si/O and Fe/O ratios of the order of one during these time periods were observed.
    Keywords: Solar Physics
    Type: Proceedings of the 31st ESALB Symposium on Correlated Phenomena at the Sun, in the Heliosphere and in Geospace; 395-400; ESA-SP-415
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  • 2
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    Observations of breakup processes of liquid jets using real-time X-ray radiography (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: To unravel the liquid-jet breakup process in the nondilute region, a newly developed system of real-time X-ray radiography, an advanced digital image processor, and a high-speed video camera were used. Based upon recorded X-ray images, the inner structure of a liquid jet during breakup was observed. The jet divergence angle, jet breakup length, and fraction distributions along the axial and transverse directions of the liquid jets were determined in the near-injector region. Both wall- and free-jet tests were conducted to study the effect of wall friction on the jet breakup process.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA, Marshall Space Flight Center, Mixing and Demixing Processes in Multiphase Flows with Application to Propulsion Systems; p 125-133
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  • 3
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    Evaluation of aerothermal modeling computer programs (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Various computer programs based upon the SIMPLE or SIMPLER algorithm were studied and compared for numerical accuracy, efficiency, and grid dependency. Four two-dimensional and one three-dimensional code originally developed by a number of research groups were considered. In general, the accuracy and computational efficieny of these TEACH type programs were improved by modifying the differencing schemes and their solvers. A brief description of each program is given. Error reduction, spline flux and second upwind differencing programs are covered.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA, Lewis Research Center, Turbine Engine Hot Section Technology, 1987; p 129-130
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  • 4
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    Stability of Capillary Surfaces in Rectangular Containers: The Right Square Cylinder (1998)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The linearized governing equations for an ideal fluid are presented for numerical analysis for the stability of free capillary surfaces in rectangular containers against unfavorable disturbances (accelerations,i.e. Rayleigh-Taylor instability). The equations are solved for the case of the right square cylinder. The results are expressed graphically in term of a critical Bond number as a function of system contact angle. A critical wetting phenomena in the corners is shown to significantly alter the region of stability for such containers in contrast to simpler geometries such as the right circular cylinder or the infinite rectangular slot. Such computational results provide additional constraints for the design of fluids systems for space-based applications.
    Keywords: Numerical Analysis
    Type: NASA/TM-1998-206629 , NAS 1.15:206629 , E-11079
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  • 5
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    Isotopic abundances and energy spectra of He super 3 and He super 4 above 40 Mev per nucleon from the galaxy. (1966)
    In:  Other Sources
    Details
    Publication Date: 2019-05-30
    Description: Telescopic measurements of primary energy spectra and abundances of He 3 and He 4 in galactic cosmic radiation
    Keywords: SPACE RADIATION
    Type: PHYSICAL REVIEW LETTERS
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  • 6
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    Anisotropy of the neutral gas distribution of Comet Halley deduced from NGE/Vega 1 measurements (1986)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The neutral gas density profile of comet Halley measured by the Neutral Gas Experiment on Vega 1 showed an asymmetry between the inbound and the outbound legs during the fly-by on 6 March 1986. The implications of this asymmetry are discussed, and it is shown how the asymmetry detected by NGE on Vega 1 can be traced back to regions on or near the nucleus to obtain their relative gas production activities at specific times of emission.
    Keywords: ASTROPHYSICS
    Type: ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas; p 417-421
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  • 7
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    Comet Halley neutral gas density profile along the Vega 1 trajectory measured by NGE (1986)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Data from the Vega 1 permitted the determination of the total neutral gas density profile along the spacecraft trajectory. Discounting small fluctuations, the field ionization source instrument measured a density profile which varied approximately as the inverse radial distance squared. Data from the electron impact ionization instrument yielded a series of calibration points; e.g., the neutral density at 100,000 km is 10,000/cc. The combined data provide a calibrated total density profile, and imply a neutral production rate of 10 to the 30th power molecules/sec.
    Keywords: ASTROPHYSICS
    Type: ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas; p 391-395
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  • 8
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    Comparative study of computational efficiency of two LU schemes for non-equilibrium reacting flows (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The systems of equations governing chemically nonequilibrium flows are solved numerically by two lower-upper(LU) algorithms, namely, LU-SSOR (Yoon and Jameson, 1987) and LU-SW (Steger and Warming, 1981). The methods of flux-Jacobian splitting differentiate the two LU algorithms. The LU-SSOR gives a simpler implicit operator with less temporal damping, while the LU-SW converges faster but requires more computation for each iteration. Relative efficiencies and mutual merits of these two LU algorithms are compared. The results show that LU-SW with upwind-differenced right-hand-side gives the best convergence.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 90-0396
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  • 9
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    Runge-Kutta methods combined with compact difference schemes for the unsteady Euler equations (1992)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: An investigation of the Runge-Kutta time-stepping, combined with compact difference schemes to solve the unsteady Euler equations, is presented. Initially, a generalized form of a N-step Runge-Kutta technique is derived. By comparing this generalized form with its Taylor's series counterpart, the criteria for the three-step and four-step schemes to be of third- and fourth-order accurate are obtained.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 92-3210
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  • 10
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    Modeling of combustion processes of stick propellants via combined Eulerian-Lagrangian approach (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This research is motivated by the improved ballistic performance of large-caliber guns using stick propellant charges. A comprehensive theoretical model for predicting the flame spreading, combustion, and grain deformation phenomena of long, unslotted stick propellants is presented. The formulation is based upon a combined Eulerian-Lagrangian approach to simulate special characteristics of the two phase combustion process in a cartridge loaded with a bundle of sticks. The model considers five separate regions consisting of the internal perforation, the solid phase, the external interstitial gas phase, and two lumped parameter regions at either end of the stick bundle. For the external gas phase region, a set of transient one-dimensional fluid-dynamic equations using the Eulerian approach is obtained; governing equations for the stick propellants are formulated using the Lagrangian approach. The motion of a representative stick is derived by considering the forces acting on the entire propellant stick. The instantaneous temperature and stress fields in the stick propellant are modeled by considering the transient axisymmetric heat conduction equation and dynamic structural analysis.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA, Marshall Space Flight Center, Mixing and Demixing Processes in Multiphase Flows with Application to Propulsion Systems; p 181-193
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