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  • 1
    Publication Date: 2011-08-16
    Description: Fast neutron spectrum produced by galactic cosmic ray protons in atmosphere, presenting Monte Carlo transport calculation results
    Keywords: SPACE RADIATION
    Type: ; ACE(
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  • 2
    Publication Date: 2018-12-01
    Description: Slope derivation from lunar orbiter photography using photometric model and computer program
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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  • 3
    Publication Date: 2016-06-07
    Description: This work has been directed toward the development of an efficient algorithm for performing this computation on the CYBER-203. The desire to provide software which gives the user the choice between the often conflicting goals of minimizing central processing (CPU) time or storage requirements has led to a diagonal-based algorithm in which one of three types of storage is selected for each diagonal. For each storage type, an initialization sub-routine estimates the CPU and storage requirements based upon results from previously performed numerical experimentation. These requirements are adjusted by weights provided by the user which reflect the relative importance the user places on the resources. The three storage types employed were chosen to be efficient on the CYBER-203 for diagonals which are sparse, moderately sparse, or dense; however, for many densities, no diagonal type is most efficient with respect to both resource requirements. The user-supplied weights dictate the choice.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA. Goddard Space Flight Center CYBER 200 Appl. Seminar; p 241-256
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  • 4
    Publication Date: 2019-06-27
    Description: Two algorithms are presented for performing a Fast Fourier Transform on a vector computer and are compared on the Control Data Corporation STAR-100. The relative merits of the two algorithms are shown to depend upon whether only a few or many independent transforms are desired. A theorem is proved which shows that a set of independent transforms can be computed by performing a partial transformation on a single vector. The results of this theorem also apply to nonvector machines and have reduced the average time per transform by a factor of two on the CDC 6600 computer.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: Mathematics of Computation; 33; July 197
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  • 5
    Publication Date: 2019-06-27
    Description: The computer program FLO-22 for analyzing inviscid transonic flow past 3-D swept-wing configurations was modified to use vector operations and run on the STAR-100 computer. The vectorized version described herein was called FLO-22-V1. Vector operations were incorporated into Successive Line Over-Relaxation in the transformed horizontal direction. Vector relational operations and control vectors were used to implement upwind differencing at supersonic points. A high speed of computation and extended grid domain were characteristics of FLO-22-V1. The new program was not the optimal vectorization of Successive Line Over-Relaxation applied to transonic flow; however, it proved that vector operations can readily be implemented to increase the computation rate of the algorithm.
    Keywords: AERODYNAMICS
    Type: NASA-TM-78665
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  • 6
    Publication Date: 2019-06-28
    Description: A three-level, time-split, mixed spectral/finite difference method for the numerical solution of the three-dimensional, compressible Navier-Stokes equations has been developed and implemented on the Control Data Corporation (CDC) CYBER-203. This method uses a spectral representation for the flow variables in the streamwise and spanwise coordinates, and central differences in the normal direction. The five dependent variables are interleaved one horizontal plane at a time and the array of their values at the grid points of each horizontal plane is a typical vector in the computation. The code is organized so as to require, per time step, a single forward-backward pass through the entire data base. The one-and two-dimensional Fast Fourier Transforms are performed using software especially developed for the CYBER-203.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
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  • 7
    Publication Date: 2019-06-27
    Description: Two representative algorithms used on a serial computer and presently executed on the Control Data Corporation 6000 computer were adapted to execute efficiently on the Control Data STAR-100 computer. Gaussian elimination for the solution of simultaneous linear equations and the Gauss-Legendre quadrature formula for the approximation of an integral are the two algorithms discussed. A description is given of how the programs were adapted for STAR and why these adaptations were necessary to obtain an efficient STAR program. Some points to consider when adapting an algorithm for STAR are discussed. Program listings of the 6000 version coded in 6000 FORTRAN, the adapted STAR version coded in 6000 FORTRAN, and the STAR version coded in STAR FORTRAN are presented in the appendices.
    Keywords: MATHEMATICS
    Type: NASA-TM-X-3003 , L-9380
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  • 8
    Publication Date: 2019-06-27
    Description: Horizon radiance profile analysis for determining atmospheric temperature
    Keywords: GEOPHYSICS
    Type: NASA-TN-D-5068
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  • 9
    Publication Date: 2019-06-27
    Description: Computer program used to infer atmospheric water-vapor mixing ratio from measured horizon radiance profiles
    Keywords: GEOPHYSICS
    Type: NASA-TN-D-5252
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  • 10
    Publication Date: 2019-06-27
    Description: Computer programs to calculate and analyze pion and nucleon interaction within prescribed medium referred to as PROPER 3C Transport Code
    Keywords: SPACE RADIATION
    Type: NASA-TM-X-2158 , L-7326
    Format: application/pdf
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