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  • 2000-2004  (2)
  • 1990-1994  (2)
  • 2003  (2)
  • 1990  (2)
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  • 2000-2004  (2)
  • 1990-1994  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Electrodeposition of polypyrrole layers on aluminium from aqueous electrolytes (1990)
    Springer
    Journal of applied electrochemistry 20 (1990), S. 596-605 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract A screening of twenty aqueous electrolytes for a film-forming electropolymerization of pyrrole with Al was performed. Electrodeposition of well adhering homogeneous polypyrrole layers on aluminium is possible from aqueous electrolytes containing 0.1–0.8M oxalic acid. Pretreatment of the metal by polishing (PD) or by anodic (galvanostatic) activation (GA) is an essential step. In all cases, the Al2O3 surface layer with pores, usually filled with electrolyte, is transformed to a Al2O3 layer with polypyrrole filled pores. The PPy-layers on Al allow an easy cathodic coating with metals like copper. The hydrogenoxalate doped layers exhibit the ususal redox capacity,y=0.3. The sandwich structure Al/Al2O3/PPy represents a condenser with an unusual composite dielectric with the electronically conducting ‘plates’ Al and PPy. According to our impedance measurements, the PPyin the pores is a high resistivity material due to overoxidation in the course of electropolymerization at high local current densities. The composite, Al2O3/overoxidized PPy, exhibits an unusually high permittivity, in the order of 103.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01008869
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    An alternative gamma tracking method using the Compton scattering probability (2003)
    Springer
    The European physical journal 20 (2003), S. 203-204 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. A new gamma tracking method, called probabilistic method and based on the Compton scattering probability of photons in a highly segmented Ge spectrometer, has been evaluated with the GEANT simulation code. This method has been used to calculate the performances of a 4 $\pi$ array composed of planar detectors as their crystal shape allows to realize identical segments of quasi-cubic shape. The tracking algorithm selects the full-absorption events by taking into account only the centre of gravity of the segments hit and the partial energies released in each of them. The results obtained, in terms of photopeak detection efficiency and peak-to-total ratio, are comparable to the ones deduced from the usual tracking methods. The probabilistic algorithm seems also to apply efficiently for other types of detectors as simulation calculations performed on a single stack of planar detector and a single segmented CLOVER detector give nearly the same reconstruction efficiency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epja/i2002-10354-7
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Superdeformed nuclear matter in nuclei with $Z \ge 82$ : Magnetic properties and neutron shell gap (2003)
    Springer
    The European physical journal 20 (2003), S. 31-32 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We report the results of an experiment, realized with the EUROBALL IV spectrometer, in which superdeformed (SD) states have been populated in 197,198Pb nuclei. Crosstalk transitions between two signature partner SD bands in 197Pb have been observed with an established M1 character, giving access to the magnetic properties of the $\nu$ [752]5/2 intruder orbital. Six new SD bands have been identified in 197,198Pb. The results are interpreted in the framework of cranked Hartree-Fock calculations. A mixing between quasi-particle excitations and an octupole vibration is suggested in the two SD isotopes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epja/i2002-10314-3
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Regulation and localization of organic osmolytes in mammalian kidney (1990)
    Springer
    Journal of molecular medicine 68 (1990), S. 1091-1095 
    Details
    ISSN: 1432-1440
    Keywords: Organic osmolytes ; Rat kidney ; Diabetes insipidus ; Diabetes mellitus ; Hormone treatment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Four organic small molecules belonging to the chemical groups of trimethylamines (betaine and glycerophosphorylcholine) and polyols (sorbitol and inositol) have been shown to act as organic osmolytes in the kidney. When measured along the corticopapillary axis, each exhibits a specific distribution pattern, indicating a specific localization and function. Studying their behaviour under vasopressin treatment in diabetes insipidus rats and after insulin treatment in diabetes mellitus rats confirmed this conclusion: AVP led to a steady increase of sorbitol and glycerophosphorylcholine over 7 days with no effect on inositol levels. Insulin treatment of diabetic rats, on the other hand, decreased sorbitol with a concomitant increase in glycerophosphorylcholine, again without any effect on tubular inositol concentrations. From this and in vitro studies it can be concluded that both hormones act by indirect mechanisms which alter interstitial osmolality. This in turn leads to a change in tubular osmolyte synthesis, uptake and release rates. In addition, the concentrations of the respective precursors glucose and choline influence the formation rates of sorbitol and betaine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01798058
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    Paper (German National Licenses)
    Fulltext
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