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  • 1995-1999  (3)
  • 1965-1969
  • 1999  (3)
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  • 1995-1999  (3)
  • 1965-1969
Year
  • 1
    Electronic Resource
    Electronic Resource
    Young's fringes from vertically integrated slab waveguides: Applications to humidity sensing (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 6483-6488 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using a multiple layer optical waveguide system consisting of two vertically slab waveguides, classical Young's fringes may be obtained in the far-field diffraction plane. In agreement with the simple theory of diffraction interference the spacing of the far-field fringes is easily observed on mm to cm dimensions without further transformation of the output light. The simple methods of fabrication and means of optical coupling should provide a readily adaptable method for examining the principles of interferometry in an integrated optical format. The structure acts to transform polarized incident plane wave input light into separate slab modes of the device which emerge as two closely spaced and coherent sources at the output. The elements required for a classical Young's fringe demonstration are therefore all embodied in this approach. The basic concept can be applied to an optical method for sensing. In one example of this we demonstrate measurement of the phase difference induced between the upper and lower propagating modes in structures due to water vapor diffusion into the layers which are formed from hydrophilic polymers. The Young's fringe patterns exhibit a spatial intensity distribution which is sensitive to water vapor introduced over the surface of the structure. Differences in the effective index between the modes of the two waveguides during the diffusion of the vapor causes phase shifts which result in redistribution in the fringe pattern. The anticipated limit of detection of these devices is lower than 1 ppm for water vapor. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371712
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Dermatofibrosarcoma protuberans: An early non-protuberant phase of the tumour (1999)
    Melbourne, Australia : Blackwell Science Pty
    Australasian journal of dermatology 40 (1999), S. 0 
    Details
    ISSN: 1440-0960
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A 40-year-old female patient presented with a flat scar-like plaque on the upper chest. The patient’s perception of subtle change in the lesion was of paramount importance in the decision to biopsy this lesion of innocuous clinical appearance. Histopathological findings were those of dermatofibrosarcoma protuberans. This case illustrates the early clinical features of the tumour and a recommendation for taking a biopsy of any scar-like plaque where there is no clear history of preceding trauma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1440-0960.1999.00313.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Reply Shikimate pathway in apicomplexan parasites (1999)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 397 (1999), S. 220-220 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Robertset al. reply Although our study was stimulated by the discovery of the apicomplexan plastid, we did not claim to have provided proof that the shikimate pathway occurred in the plastid in apicomplexans. We believe that the site of this pathway remains an ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/16621
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    Paper (German National Licenses)
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