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  • Electronic Resource  (2)
  • 1990-1994  (2)
  • 1900-1904
  • Ionic currents  (1)
  • Kirchhoff theory  (1)
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  • Electronic Resource  (2)
Years
  • 1990-1994  (2)
  • 1900-1904
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    A system model for the ultrasonic inspection of smooth planar cracks (1990)
    Springer
    Journal of nondestructive evaluation 9 (1990), S. 197-210 
    Details
    ISSN: 1573-4862
    Keywords: Ultrasonic inspections ; theoretical modeling ; elastodynamic ; geometrical theory of diffraction ; Kirchhoff theory ; probe ; computer codes ; experimental validation ; defect detection ; power station plant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract This paper describes a system model for the ultrasonic inspection of smooth planar cracks in ferritic steel, using pulse-echo probes. The model predicts the echo amplitudes and ranges as functions of the probe position. It is applied to problems of procedure design, assessment, and technical justification on power station plant. The model is implemented as a suite of versatile and user-friendly computer codes, suitable for use by practical NDT engineers, and is supported by a comprehensive user manual. The paper describes the principles of the model and gives examples of its application to power plant problems. Illustrations are also given of the extensive validation which the model has undergone through comparison with experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566394
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    The effect of oximes on the dihydropyridine-sensitive Ca current of isolated guinea-pig ventricular myocytes (1993)
    Springer
    Pflügers Archiv 422 (1993), S. 325-331 
    Details
    ISSN: 1432-2013
    Keywords: Myocyte ; Voltage clamp ; Ionic currents ; Oximes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Exposure of isolated guinea-pig ventricular myocytes to the uncharged oximes 2,3 butanedionemonoxine (BDM) and norPAM (but not by the charged PAM) results in a dose-dependent reduction of the duration of the action potential. The nifedipine-sensitive Ca current is fully inhibited by BDM (IC505.8±0.4 mM) and nor PAM but is little affected by PAM. This inhibition is unaltered by the presence of BAY K 8644 but is antagonized by isoprenaline. The effect of isoprenaline is more pronounced when the solution in the patch pipette contains the non-hydrolysable analogue of adenosine 5′-triphosphate, ATPγS (the IC50 is increased to 44.0±5.2 mM). A hastening of the inactivation of the L-type Ca current persists when either 10 mM 1,2-bis(2-aminophenoxy)-ethane-N, N, N′, N-tetraacetic acid (BAPTA) or 3 mM ATPγS is present in the pipette solution or when BAY K 8644 or isoprenaline are present in the bathing fluid. These results suggest that the inhibition of the Ca current is due to the phosphatase-like activity of the oximes but differs in some respects from previous work where a reduced level of phosphorylation is achieved by the introduction of protein kinase inhibitors or protein phosphatases into the sarcoplasm in guinea-pig myocytes. These differences could be explained if Ca channel availability is regulated by at least two sites of cAMP-dependent phosphorylation with oximes able to rapidly dephosphorylate both sites, while one of these sites is not readily dephosphorylated by the endogenous phosphatases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00374287
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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