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  • Impedance  (1)
  • Ray tracing  (1)
  • 2010-2014
  • 1990-1994  (2)
  • 1935-1939
  • 1
    Electronic Resource
    Electronic Resource
    Heuristics for ray tracing using space subdivision (1990)
    Springer
    The visual computer 6 (1990), S. 153-166 
    Details
    ISSN: 1432-2315
    Keywords: Octree ; Ray tracing ; Space subdivision ; Splitting plane ; Surface area
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract Ray tracing requires testing of many rays to determine intersections with objects. A way of reducing the computation is to organize objects into hierarchical data structures. We examine two heuristics for space subdivisions using bintrees, one based on the intuition that surface area is a good estimate of intersection probability, one based on the fact that the optimal splitting plane lies between the spatial median and the object median planes of a volume. Traversal algorithms using cross links between nodes are presented as generalizations of ropes in octrees. Simulations of the surface area heuristic and the cross link scheme are presented. These results generalize to other hierarchical data structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01911006
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  • 2
    Electronic Resource
    Electronic Resource
    Impedance spectroscopy (1992)
    Springer
    Annals of biomedical engineering 20 (1992), S. 289-305 
    Details
    ISSN: 1573-9686
    Keywords: Impedance ; Immittance ; Complex dielectric constant ; Complex modulus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract Impedance spectroscopy (IS) is a general term that subsumes the small-signal measurement of the linear electrical response of a material of interest (including electrode effects) and the subsequent analysis of the response to yield useful information about the physicochemical properties of the system. Analysis is generally carried out in the frequency domain, although measurements are sometimes made in the time domain and then Fourier transformed to the frequency domain. IS is by no means limited to the measurement and analysis of data at the impedance level (e.g., impedance vs. frequency) but may involve any of the four basic immittance levels: thus, most generally, IS stands for immittance spectroscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02368532
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