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  • 41  (5)
  • Springer  (5)
  • Annual Reviews
  • 1980-1984
  • 1975-1979  (5)
  • 1979  (3)
  • 1977  (2)
Collection
Keywords
Publisher
  • Springer  (5)
  • Annual Reviews
Years
  • 1980-1984
  • 1975-1979  (5)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Crossed gratings: A theory and its applications (1979)
    Springer
    Applied physics 18 (1979), S. 39-52 
    Details
    ISSN: 1432-0630
    Keywords: 42.80 ; 78.20 ; 41
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We introduce a rigorous formulation for the problem of the diffraction by a finitely-conducting, bi-periodic surface. The formationon is based on a coordinate transformation which maps the grating surface onto a plane. The transformed Maxwell equations are resolved using an iterative technique. The numerical implementation is tested against a number of criteria, including a comparison with two recently developed formalisms. As well, it is shown to give results in agreement with the Reciprocity Theorem, which is derived for efficiencies of crossed gratings in unpolarized light. The method has been shown to work throughout the whole range of values of surface conductivity. We investigate the effect of a surface-corrugation on the solar absorptance of a metallic mirror. We discuss a useful equivalence property linking the behaviour of crossed gratings with that of classical gratings. We exhibit for the first time a grating in a highly-reflecting metal capable of totally absorbing unpolarized incident light.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00935902
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  • 2
    Electronic Resource
    Electronic Resource
    On the theory and solar application of inductive grids (1977)
    Springer
    Applied physics 14 (1977), S. 1-20 
    Details
    ISSN: 1432-0630
    Keywords: 42.80 ; 78.20 ; 41
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A brief description is given of the rigorous formulism of Chen, which describes the diffraction by perfectly-conducting inductive grids. The formulism is used to prove several general properties of grids, including the relevant form of the Reciprocity Theorem. The theory is used to investigate the equivalent circuit model proposed by other authors for thin grids, and also to derive a monomodal model of the type first proposed by Chen. The latter model is shown to be useful even in the region where more than one spectral order propagates. The accuracy of the formulism is established by the comparison of calculated results with a number of far-infrared measurements on grids. The use of grids as solar-selective elements is investigated. They are shown to be capable of providinga/e ratios of the order of 30–40, provided that they are always pointed towards the sun, and that the diffuse content of the illumination is low.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00882627
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  • 3
    Electronic Resource
    Electronic Resource
    An application of isoperimetric inequalities to the transmission of scalar waves through small apertures (1979)
    Springer
    Applied physics 18 (1979), S. 149-154 
    Details
    ISSN: 1432-0630
    Keywords: 02 ; 41
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Isoperimetric inequalities bound the exact solution of complicated boundaryvalue problems through the use of certain simple geometric quantities. As an example of this concept, we propose bounds on the scalar (acoustic) transmission coeficient which characterizes a small aperture of arbitrary shape. These bounds depend solely on the area and perimeter of the aperture. The plausibility of the bounds is demonstrated through the evaluation of several known solutions. Results are noted for apertures in both flexible and rigid screens and these results are compared and contrasted with those of the corresponding vector (electromagnetic) problem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00934409
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  • 4
    Electronic Resource
    Electronic Resource
    Some remarks on the classical electrodynamics of moving media (1977)
    Springer
    Applied physics 14 (1977), S. 327-335 
    Details
    ISSN: 1432-0630
    Keywords: 02 ; 41
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Extension of Maxwell's electrodynamics of media at rest to moving bodies is hampered by a basic difficulty: how to determine the excitation sources and the fields inside a body which is moving relative to the laboratory where the measurements are performed. In this paper various approaches are analyzed and interpreted from a point of view not previously emphasized, i.e., theoretical results are directly related to the Röntgen-Eichenwald experiments and to the phenomenon of unipolar induction. Practical difficulties associated with possible processes of measurement are pointed out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00883435
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  • 5
    Electronic Resource
    Electronic Resource
    The Reflection of electromagnetic waves from almost periodic structures (1979)
    Springer
    Applied physics 19 (1979), S. 405-412 
    Details
    ISSN: 1432-0630
    Keywords: 02 ; 41 ; 42.82
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We investigate the reflection of electromagnetic waves from structures charaterized by a spatially varying dielectric permittivity of an almost periodic nature. The reflection from almost periodic structures is compared and contrasted with the reflection from periodic structures. Paradoxically, it is found that almost periodic structures may prove superior to their periodic counterparts when these structures are used as filters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00930104
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