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  • PHYSICS, SOLID-STATE  (3)
  • Brezzi-Babuška condition  (1)
  • Dispersion  (1)
  • 1
    Electronic Resource
    Electronic Resource
    A study of two-dimensional dispersion in unconsolidated porous media (1990)
    Springer
    Transport in porous media 5 (1990), S. 269-286 
    Details
    ISSN: 1573-1634
    Keywords: Dispersion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract An experimental and numerical investigation into the magnitude of longitudinal and transverse dispersion in a two-dimensional flow field over a particle Peclet number range of 50–8500 is reported. Numerical modelling using a Galerkin finite element method is used to test various models, notably those of Fried and combarnous and Koch and Brady. Dispersion at low Peclet numbers (〈 200) is found to be described adequately by either model, which at large Peclet, the degree of dispersion is significantly underestimated. An improved dispersion model for Peclet numbers greater than 200 is proposed. The transverse dispersion term and the choice of inlet boundary condition are found to have a negligible effect on the shape of the breakthrough curve.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00140016
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    A decomposed Crouzeix-Raviart element for the finite element solution of the Navier-Stokes equation (1991)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 13 (1991), S. 1073-1083 
    Details
    ISSN: 0271-2091
    Keywords: Crouzeix-Raviart ; Analytical integration ; Brezzi-Babuška condition ; Navier-Stokes ; Finite element method ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A methodology for the decomposition of the Crouzeix-Raviart finite element into six linear subelements is described. The resulting element is shown to satisfy the Brezzi-Babuška compatibility condition. The error bounds are also established. A comparison in accuracy between this and the standard Crouzeix-Raviart element is presented for driven cavity flows. Other results include the execution time for the DCR element and the Crouzeix-Raviart element along with both analytical and numerical integration. It is shown that the decomposed element results in shorter execution times with only marginal changes in accuracy.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650130902
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    Paper (German National Licenses)
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  • 3
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    The use of semiconductors in nonreciprocal devices for submillimeter wavelengths. (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: This paper reviews the use of anisotropic effects in a passive semiconductor magnetoplasma for the development of submillimeter isolators and circulators. The emphasis is on two schemes that are applicable over the far infrared portion of the spectrum. The theory of transmission devices depending on Faraday rotation is described, and experiments are discussed. At far infrared wavelengths it is not necessary to cool the semiconductor in order to achieve low forward loss. Some experimental results are available in this frequency range, and a theoretical evaluation of device performance is given. Reflection devices in which the desired signal does not propagate through the semiconductor, but is reflected off of its surface, are also discussed. Experimental results show that these devices can have a low forward loss; a variety of novel geometrical arrangements are able to improve isolator performance. Theoretical results indicating satisfactory performance for a far infrared isolator using InSb at room temperature are presented.
    Keywords: PHYSICS, SOLID-STATE
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The application of semiconductors to quasi- optical isolators for use at submillimeter wavelengths (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Semiconductor application to quasi-optical isolators - nonreciprocal reflection beam isolator and far infrared isolators using Faraday rotation
    Keywords: PHYSICS, SOLID-STATE
    Type: NASA-CR-86379
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    The application of semiconductors to quasi- optical and waveguide isolators for use at millimeter wavelengths (1969)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Utilization of anisotropic effects in semiconductor plasmas for development of millimeter wavelength isolators
    Keywords: PHYSICS, SOLID-STATE
    Type: NASA-CR-105980
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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