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  • Articles  (4)
  • SEM  (2)
  • Ultrasonics  (2)
  • Springer  (4)
  • American Association for the Advancement of Science (AAAS)
  • 2005-2009
  • 1985-1989  (4)
  • Electrical Engineering, Measurement and Control Technology  (4)
Collection
  • Articles  (4)
Source
Keywords
Publisher
  • Springer  (4)
  • American Association for the Advancement of Science (AAAS)
Years
  • 2005-2009
  • 1985-1989  (4)
Year
Topic
  • 1
    Electronic Resource
    Electronic Resource
    Diffraction of elastic waves by defects in plates: Calculated arrival strengths for point force and thermoelastic sources of ultrasound (1986)
    Springer
    Journal of nondestructive evaluation 5 (1986), S. 145-156 
    Details
    ISSN: 1573-4862
    Keywords: Ultrasonics ; elastic waves ; diffraction ; defects ; time-of-flight technique ; thermoelastic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract This paper applies geometrical ray theory to the calculation of the surface displacements generated by point force and thermoelastic sources of ultrasound in plates containing planar defects. The calculation includes direct wave arrivals, waves undergoing back-wall reflection with or without mode conversion, and waves diffracted by the crack-tip. Ultrasonic B-scan data are also simulated so that comparison can be made with experimental data. It is shown that the thermoelastic source, which can be generated by a pulsed laser, is particularly well suited to defect detection by the ultrasonic time-of-flight technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00570623
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A numerical integration Green's function model for ultrasonic field profiles in mildly anisotropic media (1989)
    Springer
    Journal of nondestructive evaluation 8 (1989), S. 165-179 
    Details
    ISSN: 1573-4862
    Keywords: Ultrasonics ; Green's function ; anisotropic media ; field profiles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract A numerical integration technique utilizing a point source Green's function is introduced to analyze the wave behavior in transversely isotropic-type anisotropic media allowing us to make fast and accurate computations of the acoustic field. The centrifugally cast stainless steel (CCSS) used in nuclear power plants is chosen as a sample medium because of its columnar grain character leading to material anisotropy. A representative number of field profiles are computed and plotted to illustrate the quasi-longitudinal, quasi-transverse, and horizontally-polarized shear wave propagation in a transversely-isotropic medium. Phenomena such as beam skewing, beam splitting, beam focusing, unsymmetrical beams, and other anisotropic effects, some of which are already known from earlier experimental observations, emerge as a computational result of the introduced technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00570885
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Interfacial phenomena and microstructural connectivity in explosively fabricated Y-Ba-Cu-O superconductors (1988)
    Springer
    Journal of superconductivity 1 (1988), S. 3-19 
    Details
    ISSN: 1572-9605
    Keywords: YBa2Cu3O7 ; explosive consolidation ; SEM ; TEM
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Measurements of supercurrent transport and current density in explosively fabricated superconducting prototypes have been erratic, with current densities measured to be in excess of 103 A/cm2. This erratic behavior appears to be related to the degree of consolidation achieved for Y-Ba-Cu-O powders and, more specifically, to the connectivity or interfacial structure at individual, contacting, superconducting particles. We have used SEM and TEM to characterize and illustrate some of these features in preliminary superconducting prototypes composed of Y-Ba-Cu-O powder channels consolidated and encapsulated in copper and aluminum matrices by explosively generated shock waves. Observations of grain boundaries and interface phase regions cast some light on the prospects for producing good connectivity through optimizing the consolidation process and process parameters as well as the elimination of surface reactions on particles prior to consolidation, or thermal effects during consolidation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617947
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  • 4
    Electronic Resource
    Electronic Resource
    Structure and superconductivity of Bi-(Pb)-Ca-Sr-Cu-O ceramics processed by arc melting (1989)
    Springer
    Journal of superconductivity 2 (1989), S. 501-511 
    Details
    ISSN: 1572-9605
    Keywords: superconductors ; Bi-(Pb)-Ca-Sr-Cu-O ; X-ray diffraction ; electrical resistivity ; critical current density ; SEM ; a.c. susceptibility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The Bi-(Pb)-Ca-Sr-Cu-O ceramics of typical cation composition 2 (0.4) 223, presintered at 800°C, are formed by arc melting and rapidly cooling the 2021 superconducting phase, CaO, and Cu2O. The arc-melted samples sintered in air at 840°C exhibit a solid-state structural transformation of the components and a mixture of 2122 and 2223 superconducting phases, and small amounts of Ca2CuO3, Ca2PbO4, and CuO appear. When the arc melting is used as an intermediate stage in the preparation of the high-T c superconductors in this system, a significant increase in density (from 3.7 to 5.7 g/cm3) and in critical current density (from 28 to 60 A/cm2 in zero field and at liquid-nitrogen temperature) is observed, while the critical temperature remains practically unchanged (−104 K).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00627563
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    Paper (German National Licenses)
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