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  • Polymer and Materials Science  (2)
  • method-of-moments  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Lithographic Dipole Antenna Properties at 10 μm Wavelength: Comparison of Method-of-Moments Predictions with Experiment (1998)
    Springer
    International journal of infrared and millimeter waves 19 (1998), S. 817-825 
    Details
    ISSN: 1572-9559
    Keywords: dipole ; method-of-moments ; lithographic antenna
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Dipole antennas designed for operation at 10 μm wavelength have been fabricated by optical lithography and their properties measured by detection of CO2 laser radiation in integrated thin-film bolometers. We find a remarkably strong increase in cross-polarized signal as the antenna linewidth is increased. The measured beam pattern is a saddle point at broadside (local minimum in the H-plane, local maximum in the E-plane) as predicted by standard method-of-moments theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022620322622
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The use of extraction replicas in scanning electron microscopy for the elemental analysis of marginal seals (1987)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 21 (1987), S. 955-964 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Elemental analysis of marginal seal material on 20 bulk samples of occlusally restored teeth have shown that, generally, more elements were detected in the seal material analyzed on the bulk restoration or fractured tooth surfaces than when such material was extracted using a nitrocellulose replica prior to analysis. No mercury was detected in any of the extracted seal material and only three of the replica specimens contained silver. This implies that the technique of using extraction replicas to remove material from the amalgam-tooth interface for subsequent x-ray microanalysis can provide an accurate elemental composition. The details of fabrication and the advantages of using high resolution nitrocellulose replicas for extracting marginal seal material from teeth for subsequent x-ray microanalysis are described.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820210802
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Degradation of polymers by hyperthermal atomic oxygen (1994)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 22 (1994), S. 532-537 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Degradation of polymers by hyperthermal species (e.g. atomic oxygen (ATOX)) occurs in a variety of practical systems including external surfaces of spacecraft in low earth orbits (LEO), for which the impact with the residual atomic oxygen (impact energy 3-7 eV) results in significant erosion. In the present work the effects of hyperthermal species on two polymers commonly used for space applications (Kapton H and Teflon FEP) were investigated. The polymers were exposed to 30 eV O+ and Ne+ fluences of 1015-1019 ions cm-2. The phenomena investigated included total mass loss and changes of surface morphology (SEM and AFM) and surface chemical composition (XPS). The relative significance of the collisional and chemical degradation processes was evaluated by comparing the effects of O+ and Ne+ bombardment. AFM analysis was found very powerful in studying the damage from its initial atomic scale (roughness of ∼ 1 nm) to its final macroscopic scale (roughness 〉 1 μm).
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.7402201113
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    Paper (German National Licenses)
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