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  • Weitere Quellen  (807)
  • FLUID MECHANICS AND HEAT TRANSFER  (358)
  • STRUCTURAL MECHANICS  (240)
  • COMMUNICATIONS AND RADAR  (209)
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  • 1990-1994  (807)
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  • 1
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    A multidimensional flux function with applications to the Euler and Navier-Stokes equations (1993)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-24
    Beschreibung: In the present grid-independent approximate Riemann solver for 2D and 3D flows that are governed by the Euler or Navier-Stokes equations, fluxes on grid faces are obtained by wave decomposition; the assumption of information-propagation in the velocity-difference directions leads to a more accurate resolution of shear and shock waves, when these are are oblique to the grid. The model, which yields significantly greater accuracy in both supersonic and subsonic first-order spatially accurate computations, describes the difference in states at each grid interface by the action of five waves.
    Schlagwort(e): FLUID MECHANICS AND HEAT TRANSFER
    Materialart: Journal of Computational Physics (ISSN 0021-9991); 105; 2; p. 306-323.
    Format: text
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  • 2
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    Modeling of resistive sheets in finite element solutions (1992)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-24
    Beschreibung: A formulation is presented for modeling a resistive card in the context of the finite element method. The appropriate variational function is derived and for variational purposes results are presented for the scattering by metal-backed cavity loaded with a resistive card.
    Schlagwort(e): COMMUNICATIONS AND RADAR
    Materialart: IEEE Transactions on Antennas and Propagation (ISSN 0018-926X); 40; 6, Ju; 727-731
    Format: text
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  • 3
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    Modeling of supersonic combustor flows using parallel computing (1992)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-24
    Beschreibung: While current 3D CFD codes and modeling techniques have been shown capable of furnishing engineering data for complex scramjet flowfields, the usefulness of such efforts is primarily limited by solutions' CPU time requirements, and secondarily by memory requirements. Attention is presently given to the use of parallel computing capabilities for engineering CFD tools for the analysis of supersonic reacting flows, and to an illustrative incompressible CFD problem using up to 16 iPSC/2 processors with single-domain decomposition.
    Schlagwort(e): FLUID MECHANICS AND HEAT TRANSFER
    Materialart: Computing Systems in Engineering (ISSN 0956-0521); 3; 1-4; p. 217-229.
    Format: text
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  • 4
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    The effects of crushing surface roughness on the crushing characteristics of composite tubes (1992)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-24
    Beschreibung: The effects of crushing-surface roughness on the energy-absorption capability of graphite and glass-epoxy composite tubes were investigated. Fifty different combinations of fiber, matrix, and specimen ply orientation were evaluated. Two different crushing surface roughnesses were used in this investigation. Crushing surface significantly influences the energy-absorption capability only of tubes that crush in the lamina bending crushing mode; tubes that crush in other modes are not influenced because their lamina bundles do not slide against the crushing surface. Those tubes that crush in the lamina bending mode can achieve higher, lower, or no change in energy-absorption capability as crushing surface roughness increases. If the fiber failure strain of tubes that crush in the lamina bending crushing mode exceeds the matrix failure strain then the energy-absorption capability increases as crushing surface roughness increases. However, if the matrix failure strain exceeds the fiber failure strain then the energy-absorption capability increases as crushing surface roughness decreases. Energy-absorption capability is uninfluenced by crushing surface roughness for tubes that have equal fiber and matrix failure strains.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: American Helicopter Society, Journal (ISSN 0002-8711); 37; 3; p. 53-60.
    Format: text
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  • 5
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    Electromagnetic scattering from arbitrary shaped conducting bodies coated with lossy materials of arbitrary thickness (1991)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-19
    Beschreibung: A simple and efficient numerical technique is presented to solve the electromagnetic scattering problem of coated conducting bodies of arbitrary shape. The surface equivalence principle is used to formulate the problem in terms of a set of coupled integral equations involving equivalent electric and magnetic surface currents which represent boundary fields. The conducting structures and the dielectric materials are modeled by planar triangular patches, and the method of moments is used to solve the integral equations. Numerical results for scattering cross sections are given for various structures and compared with other available data. These results are proved accurate by a number of representative examples.
    Schlagwort(e): COMMUNICATIONS AND RADAR
    Materialart: IEEE Transactions on Antennas and Propagation (ISSN 0018-926X); 39; 627-631
    Format: text
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  • 6
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    On estimating the phase of a periodic waveform in additive Gaussian noise, part 3 (1991)
    In:  CASI
    Details
    Publikationsdatum: 2013-08-31
    Beschreibung: Motivated by advances in signal processing technology that support more complex algorithms, researchers have taken a new look at the problem of estimating the phase and other parameters of a nearly periodic waveform in additive Gaussian noise, based on observation during a given time interval. Parts 1 and 2 are very briefly reviewed. In part 3, the actual performances of some of the highly nonlinear estimation algorithms of parts 1 and 2 are evaluated by numerical simulation using Monte Carlo techniques.
    Schlagwort(e): COMMUNICATIONS AND RADAR
    Materialart: The Telecommunications and Data Acquisition Report; p 157-160
    Format: application/pdf
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  • 7
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    Criteria for ultrastable operation of the trapped ion frequency standard (1992)
    In:  CASI
    Details
    Publikationsdatum: 2013-08-31
    Beschreibung: The leading systematic perturbations to the Jet Propulsion Laboratory's (JPL's) mercury trapped ion frequency standard are characterized under present operating conditions. Sensitivity of the standard to environmental variations is measured, and the required regulation of key components to obtain a stability of 10(exp -16) is identified.
    Schlagwort(e): COMMUNICATIONS AND RADAR
    Materialart: The Telecommunications and Data Acquisition Report; p 19-30
    Format: application/pdf
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  • 8
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    Recent advances in coding theory for near error-free communications (1991)
    In:  CASI
    Details
    Publikationsdatum: 2013-08-31
    Beschreibung: Channel and source coding theories are discussed. The following subject areas are covered: large constraint length convolutional codes (the Galileo code); decoder design (the big Viterbi decoder); Voyager's and Galileo's data compression scheme; current research in data compression for images; neural networks for soft decoding; neural networks for source decoding; finite-state codes; and fractals for data compression.
    Schlagwort(e): COMMUNICATIONS AND RADAR
    Materialart: NASA, Washington, Technology 2000, Volume 2; p 229-241
    Format: application/pdf
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  • 9
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    Modeling of resistive sheets in finite element solutions (1992)
    In:  CASI
    Details
    Publikationsdatum: 2013-08-31
    Beschreibung: A formulation is presented for modeling a resistive card in the context of the finite element method. The appropriate variational function is derived and for variational purposes results are presented for the scattering by a metal-backed cavity loaded with a resistive card.
    Schlagwort(e): COMMUNICATIONS AND RADAR
    Materialart: Michigan Univ., Electromagnetic Characterization of Conformal Antennas; 11 p
    Format: application/pdf
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  • 10
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    Experiences in porting NASTRAN (R) to non-traditional platforms (1991)
    In:  CASI
    Details
    Publikationsdatum: 2013-08-31
    Beschreibung: The 1990 UNIX version of NASTRAN was ported to two new platforms that are not supported by COSMIC: the Sun SPARC workstation and the Apple Macintosh using the A/UX version of UNIX. The experiences of the authers in porting NASTRAN is summarized here. Suggestions for users who might attempt similar ports are given.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: Computer Software Management and Information Center, Nineteenth NASTRAN (R) Users' Colloquium; p 14-21
    Format: application/pdf
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