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  • 1
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    Hypermatrix scheme for finite element systems on CDC STAR-100 computer (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A study is made of the adaptation of the hypermatrix (block matrix) scheme for solving large systems of finite element equations to the CDC STAR-100 computer. Discussion is focused on the organization of the hypermatrix computation using Cholesky decomposition and the mode of storage of the different submatrices to take advantage of the STAR pipeline (streaming) capability. Consideration is also given to the associated data handling problems and the means of balancing the I/Q and cpu times in the solution process. Numerical examples are presented showing anticipated gain in cpu speed over the CDC 6600 to be obtained by using the proposed algorithms on the STAR computer.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: Computers and Structures; 5; Dec. 197
    Format: text
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  • 2
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    Program design by a multidisciplinary team (1975)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The use of software engineering aids in the design of a structural finite-element analysis computer program for the STAR-100 computer is described. Nested functional diagrams to aid in communication among design team members were used, and a standardized specification format to describe modules designed by various members was adopted. This is a report of current work in which use of the functional diagrams provided continuity and helped resolve some of the problems arising in this long-running part-time project.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: IEEE Transactions on Software Engineering; SE-1; Dec. 197
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  • 3
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    Enabling technology for NASA's Europa Orbiter mission (2001)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Description: The authors will describe the drivers for the subsystem requirements in the Europa Orbiter mission, in particular the mission criticality of the IMU and the predicted natural space radiation environments that require enabling technologies to be identified. Descriptions of the Europa IMU and the HRG technology are given with emphasis on the inherent radiation hardness in the HRG principle of operation and sensor construction, as well as the steps taken to further harden the sensor electronics.
    Keywords: Lunar and Planetary Science and Exploration
    Type: 24th Annual AAS Guidance and Control Conference; Breckenridge, CO; United States
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  • 4
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    Analysis of dissection algorithms for vector computers (1978)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Recently two dissection algorithms (one-way and incomplete nested dissection) have been developed for solving the sparse positive definite linear systems arising from n by n grid problems. Concurrently, vector computers (such as the CDC STAR-100 and TI ASC) have been developed for large scientific applications. An analysis of the use of dissection algorithms on vector computers dictates that vectors of maximum length be utilized thereby implying little or no dissection; on the other hand, minimizing operation counts suggest that considerable dissection be performed. In this paper we discuss the resolution of this conflict by minimizing the total time required by vectorized versions of the two algorithms.
    Keywords: COMPUTER OPERATIONS AND HARDWARE
    Type: Computers and Mathematics with Applications; 4; 4, 19; 1978
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  • 5
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    The current status of microcomputer arrays (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Some research projects on microcomputer arrays are at the stage of constructing hardware, while others are at the design and planning stages. A general overview of the topic is followed by a more detailed discussion of three projects whose purposes are specifically scientific computation.
    Keywords: STRUCTURAL MECHANICS
    Type: Res. in Computerized Structural Analysis and Syn.,; p 31-42
    Format: application/pdf
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  • 6
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    A variant of nested dissection for solving n by n grid problems (1976)
    In:  CASI
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    Publication Date: 2019-06-27
    Description: Nested dissection orderings are known to be very effective for solving the sparse positive definite linear systems which arise from n by n grid problems. In this paper nested dissection is shown to be the final step of incomplete nested dissection, an ordering which corresponds to the premature termination of dissection. Analyses of the arithmetic and storage requirements for incomplete nested dissection are given, and the ordering is shown to be competitive with nested dissection under certain conditions.
    Keywords: NUMERICAL ANALYSIS
    Type: NASA-CR-149415 , AD-A028709 , TR-12
    Format: application/pdf
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  • 7
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    Incomplete nested dissection for solving n by n grid problems (1978)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Nested dissection orderings are known to be very effective for solving sparse positive definite linear systems which arise from n by n grid problems. In this paper we consider incomplete nested dissection, an ordering which corresponds to the premature termination of nested dissection. Analyses of the arithmetic and storage requirements for incomplete nested dissection are given and the ordering is shown to be competitive with nested dissection with regard to arithmetic operations and superior to that ordering in storage requirements.
    Keywords: NUMERICAL ANALYSIS
    Type: SIAM Journal on Numerical Analysis; 15; Aug. 197
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  • 8
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    A magnetospheric magnetic field model with flexible current systems driven by independent physical parameters (1995)
    In:  Other Sources
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    Publication Date: 2019-08-27
    Description: A tilt-dependent magnetic field model of the Earth's magnetosphere with variable magnetopause standoff distance is presented. Flexible analytic representations for the ring and cross-tail currents, each composed of the elements derived from the Tsyganenko and Usmanov (1982) model, are combined with the fully shielded vacuum dipole configurations of Voigt (1981). Although the current sheet does not warp in the y-z plane, changes in the shape and position of the neutral sheet with dipole tilt are consistent with both MHD equilibrium theory and observations. In addition, there is good agreement with observed Delta B profiles and the average equatorial contours of magnetic field magnitude. While the dipole field is rigorously shielded within the defined magnetopause, the ring and cross-tails currents are not similarly confined, consequently, the model's region of validity is limited to the inner magnetosphere. The model depends on four independent external parameters. We present a simple but limited method of simulating several substorm related magnetic field changes associated with the disrupion of the near-Earth cross-tail current sheet and collapse of the midnight magnetotail field region. This feature further facilitates the generation of magnetic field configuration time sequences useful in plasma convection simulations of real magnetospheric events.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 100; A4; p. 5613-5626
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  • 9
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    A study of weak anisotropy in electron pressure in the tail current sheet (1995)
    In:  Other Sources
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    Publication Date: 2019-08-27
    Description: We adopt a magnetotail model with stretched field lines where ion motions are generally nonadiabatic and where it is assumed that the pressure anisotropy resides only in the electron pressure tensor. We show that the magnetic field lines with p(perpendicular) greater than p(parallel) are less stretched than the corresponding field lines in the isotropic model. For p(parallel) greater than p(perpendicular), the magnetic field lines become more and more stretched as the anisotropy approaches the marginal firehose limit, p(parallel) = p(perpendicular) + B(exp 2)/mu(sub 0). We also show that the tail current density is highly enhanced at the firehose limit, a situation that might be subject to a microscopic instability. However, we emphasize that the enhancement in the current density is notable only near the center of the tail current sheet (z = 0). Thus it remains unclear whether any microscopic instability can significantly alter the global magnetic field configuration of the tail. By comparing the radius of the field-line curvature at z = 0 with the particle's gyroradius, we suspect that even the conventional adiabatic description of electrons may become questionable very close to the marginal firehose limit.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 100; A3; p. 3573-3584
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  • 10
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    Computer-aided design and computer science technology (1976)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: A description is presented of computer-aided design requirements and the resulting computer science advances needed to support aerospace design. The aerospace design environment is examined, taking into account problems of data handling and aspects of computer hardware and software. The interactive terminal is normally the primary interface between the computer system and the engineering designer. Attention is given to user aids, interactive design, interactive computations, the characteristics of design information, data management requirements, hardware advancements, and computer science developments.
    Keywords: MATHEMATICAL AND COMPUTER SCIENCES (GENERAL)
    Type: Conference on Computer science and scientific computing; Apr 01, 1976 - Apr 02, 1976; Williamsburg, VA
    Format: text
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