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  • 1
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    A discontinuous melt sheet in the Manson impact structure (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Petrologic studies of the core recovered from holes drilled in the Manson, Iowa, buried impact structure may unravel the thermal history of the crater-fill debris. We made a cursory examination of about 200 m of core recovered from the M-1 bore hole. The M-1 bore hole was the first of 12 holes drilled as part of a cooperative drilling program between the U.S. Geological Survey and the Iowa Geological Survey Bureau. The M-1 core hole is about 6 km northeast of the center of the impact structure, apparently on the flank of its central peak. We developed a working hypothesis that a 30-m-thick breccia unit within a 53-m-thick unit previously termed the 'crystalline clast breccia with glassy matrix' is part of a discontinuous melt sheet in the crater-fill impact debris. The 30-m-thick breccia unit reached temperatures sufficient to partially melt some small breccia clasts and convert the fine-grained breccia matrix into a silicate melt that cooled to a greenish-black, flinty, microcrystalline rock. The results of the investigation of this unit are presented.
    Keywords: GEOPHYSICS
    Type: Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 2: G-M; p 705-706
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    FAME, a microprocessor based front-end analysis and modeling environment (1980)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Higher order software (HOS) is a methodology for the specification and verification of large scale, complex, real time systems. The HOS methodology was implemented as FAME (front end analysis and modeling environment), a microprocessor based system for interactively developing, analyzing, and displaying system models in a low cost user-friendly environment. The nature of the model is such that when completed it can be the basis for projection to a variety of forms such as structured design diagrams, Petri-nets, data flow diagrams, and PSL/PSA source code. The user's interface with the analyzer is easily recognized by any current user of a structured modeling approach; therefore extensive training is unnecessary. Furthermore, when all the system capabilities are used one can check on proper usage of data types, functions, and control structures thereby adding a new dimension to the design process that will lead to better and more easily verified software designs.
    Keywords: COMPUTER OPERATIONS AND HARDWARE
    Type: Aerospace Appl. of Microprocessors; p 161-166
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    NASA TECHNICAL REPORTS
  • 3
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    Conservation properties of numerical integration methods for systems of ordinary differential equations (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: If a system of ordinary differential equations represents a property conserving system that can be expressed linearly (e.g., conservation of mass), it is then desirable that the numerical integration method used conserve the same quantity. It is shown that both linear multistep methods and Runge-Kutta methods are 'conservative' and that Newton-type methods used to solve the implicit equations preserve the inherent conservation of the numerical method. It is further shown that a method used by several authors is not conservative.
    Keywords: NUMERICAL ANALYSIS
    Type: Journal of Computational Physics; 20; Mar. 197
    Format: text
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  • 4
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    Numerical solution of stiff systems of ordinary differential equations with applications to electronic circuits (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Systems of ordinary differential equations in which the magnitudes of the eigenvalues (or time constants) vary greatly are commonly called stiff. Such systems of equations arise in nuclear reactor kinetics, the flow of chemically reacting gas, dynamics, control theory, circuit analysis and other fields. The research reported develops an A-stable numerical integration technique for solving stiff systems of ordinary differential equations. The method, which is called the generalized trapezoidal rule, is a modification of the trapezoidal rule. However, the method is computationally more efficient than the trapezoidal rule when the solution of the almost-discontinuous segments is being calculated.
    Keywords: ELECTRONICS
    Type: NASA-CR-134571 , TR-140
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  • 5
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    Subcellular components of the amphibian egg - Insights provided by gravitational studies (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The variability in the response of Xenopus laevis eggs to a given force environment is studied. The roles of cytoplasmic organelle, the yolk platelets, and cytoskeletal components in varying in cytoplasmic mobility are examined. The data reveal that the packing of yolk platelets is not a major factor in causing cytoplasmic mobility differences and microtubules may affect cytoplasmic mobility.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: - Gravitational Biology, Espoo, Finland, July 18-29, 1988) Advances in Space Research (ISSN 0273-1177); 177-186
    Format: text
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