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  • Electronic Resource  (2)
  • 1990-1994  (2)
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  • Electronic Resource  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Numerical calculations of modes of optical waveguides with two-dimensional refractive index profiles by a field correction method (1994)
    Springer
    Optical and quantum electronics 26 (1994), S. S135 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstact We describe a numerical method devised to calculate the lower-order modes of optical waveguides with two-dimensional transverse index profiles. This method is based on finite-difference approximation of the scalar wave equation and the minimization of the error in the field shape of a mode. The field correction method can be applied to waveguides with large index steps and generates the mode's scalar propagation constant and its field. To test the field correction method, it is applied to a three-layer optical fibre and the results are compared with exact solutions. The error in the calculations of the modal effective indices is found to be of the order of 10-6. Example mode calculations are given for fused couplers and rib waveguides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00384668
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Extent of the tetrodotoxin induced blockade examined by pupillary paralysis elicited by intracerebral injection of the drug (1991)
    Springer
    Experimental brain research 83 (1991), S. 687-690 
    Details
    ISSN: 1432-1106
    Keywords: Tetrodotoxin ; Intracerebral injection of drugs ; Edinger ; Westphal nucleus ; Functional ablation ; Pupil ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Spatial extent and duration of the functional blockade elicited by intracerebral injection of tetrodotoxin (TTX) was examined in rats anesthetized with pentobarbital. Pupillary diameter was measured under dissecting microscope before and up to 24 h after injection of TTX (10 ng/l μl saline) into or 1.0, 1.5 and 2.0 mm lateral from the Edinger-Westphal nucleus. TTX administration elicited mydriasis the latency of which was directly and amplitude indirectly proportional to the target-injection distance. The maximum mydriasis attained 3.4 mm, lasted 2 h and slowly decayed over subsequent 20 h. Impulse transmission and conduction was blocked in a spherical volume of tissue about 3 mm in diameter the development of which could be approximated by diffusion from an instantaneous point source. Completeness and full reversibility make the TTX block a convenient research tool.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00229849
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    Paper (German National Licenses)
    Fulltext
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