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  • 1
    Electronic Resource
    Electronic Resource
    Parallel implementation of finite-element/newton method for solution of steady-state and transient nonlinear partial differential equations (1995)
    Springer
    Journal of scientific computing 10 (1995), S. 93-137 
    Details
    ISSN: 1573-7691
    Keywords: Domain decomposition ; nested dissection ; LU-factorization ; time integration ; Newton's method ; spectral elements ; finite elements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract Domain decomposition by nested dissection for concurrent factorization and storage (CFS) of asymmetric matrices is coupled with finite element and spectral element discretizations and with Newton's method to yield an algorithm for parallel solution of nonlinear initial-and boundary-value problem. The efficiency of the CFS algorithm implemented on a MIMD computer is demonstrated by analysis of the solution of the two-dimensional, Poisson equation discretized using both finite and spectral elements. Computation rates and speedups for the LU-decomposition algorithm, which is the most time consuming portion of the solution algorithm, scale with the number of processors. The spectral element discretization with high-order interpolating polynomials yields especially high speedups because the ratio of communication to computation is lower than for low-order finite element discretizations. The robustness of the parallel implementation of the finite-element/Newton algorithm is demonstrated by solution of steady and transient natural convection in a two-dimensional cavity, a standard test problem for low Prandtl number convection. Time integration is performed using a fully implicit algorithm with a modified Newton's method for solution of nonlinear equations at each time step. The efficiency of the CFS version of the finite-element/Newton algorithm compares well with a spectral element algorithm implemented on a MIMD computer using iterative matrix methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02087962
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    An incomplete nested dissection algorithm for parallel direct solution of finite element discretizations of partial differential equations (1993)
    Springer
    Journal of scientific computing 8 (1993), S. 373-387 
    Details
    ISSN: 1573-7691
    Keywords: Domain decomposition ; nested dissection ; LU-factorization ; parallel computers ; MIMD
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract A multilevel algorithm is presented for direct, parallel factorization of the large sparse matrices that arise from finite element and spectral element discretization of elliptic partial differential equations. Incomplete nested dissection and domain decomposition are used to distribute the domain among the processors and to organize the matrix into sections in which pivoting is applied to stabilize the factorization of indefinite equation sets. The algorithm is highly parallel and memory efficient; the efficient use of sparsity in the matrix allows the solution of larger problems as the number of processors is increased, and minimizes computations as well as the number and volume of communications among the processors. The number of messages and the total volume of messages passed during factorization, which are used as measures of algorithm efficiency, are reduced significantly compared to other algorithms. Factorization times are low and speedups high for implementation on an Intel iPSC/860 hypercube computer. Furthermore, the timings for forward and back substitutions are more than an order-of-magnitude smaller than the matrix decomposition times.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01061145
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    Paper (German National Licenses)
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  • 3
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    Space Station Freedom - A resource for aerospace education (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The role of the International Space Station in future U.S. aerospace education efforts is discussed from a NASA perspective. The overall design concept and scientific and technological goals of the Space Station are reviewed, and particular attention is given to education projects such as the Davis Planetarium Student Space Station, the Starship McCullough, the Space Habitat, the working Space Station model in Austin, TX, the Challenger Center for Space Life Education, Space M+A+X, and the Space Science Student Involvement Program. Also examined are learning-theory aspects of aerospace education: child vs adult learners, educational objectives, teaching methods, and instructional materials.
    Keywords: SOCIAL SCIENCES (GENERAL)
    Type: IAF PAPER 88-467
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Space education in the context of U.S. Government multiagency efforts in science and mathematics education (1991)
    In:  Other Sources
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    Publication Date: 2019-08-27
    Description: The status of a multiagency endeavor to involve U.S. Federal agencies in the attainment of National Education Goals for the 1990's is presented. Emphasis is placed on the educational activities of NASA, which is one of 16 Federal agencies on the Federal Coordinating Council for Science, Engineering and Technology. NASA's is a prototype education program for achieving excellence in mathematics and science in the coming generations of Americans.
    Keywords: SOCIAL SCIENCES (GENERAL)
    Type: IAF PAPER 91-524
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Space education in the context of U.S. government multiagency efforts in science and mathematics education (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The educational activities of NASA which is one of 16 agencies on the Federal Coordinating Council for Science, Engineering and Technology is discussed. NASA's education mission is to utilize its unique facilities and its specialized workforce to conduct and to leverage externally conducted science, mathematics, and technology education programs and activities. These efforts aimed at meeting the national education goals should help to preserve U.S. leadership in aeronautics, space science, and technology.
    Keywords: SOCIAL SCIENCES (GENERAL)
    Type: AIAA PAPER 92-1687
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    NASA's educational programs (1990)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: The educational programs of NASA's Educational Affairs Division are examined. The problem of declining numbers of science and engineering students is reviewed. The various NASA educational programs are described, including programs at the elementary and secondary school levels, teacher education programs, and undergraduate, graduate, and university faculty programs. The coordination of aerospace education activities and future plans for increasing NASA educational programs are considered.
    Keywords: SOCIAL SCIENCES (GENERAL)
    Type: Government Information Quarterly (ISSN 0740-624X); 7; 2, 19
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Scientific Literacy for the 21st Century (SL-21) (1989)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: A proposal called, 'Scientific Literacy for the 21st Century (SL-21)', has been introduced, suggesting ways in which NASA may work to increase scientific literacy in the U.S. The future need for an adequate supply of scientists and engineers for the space program is discussed. The principles of the SL-21 proposal are outlined. The program would emphasize education in the fields of space technologies and earth and planetary sciences. The educational elements of the proposal for teachers, students, universities, and the general adult population are described.
    Keywords: SOCIAL SCIENCES (GENERAL)
    Type: IAF PAPER 89-557
    Format: text
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    NASA TECHNICAL REPORTS
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