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  • 1
    Electronic Resource
    Electronic Resource
    On the interpretation of data from Converging Flow Rheometers (1989)
    Springer
    Rheologica acta 28 (1989), S. 215-222 
    Details
    ISSN: 1435-1528
    Keywords: Converging flow rheometer ; planar extensional viscosity ; polymer solutions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract A reappraisal of data obtained from a Converging Flow Rheometer (CFR) is presented, together with new results for a specific polymer solution. Particular emphasis is placed on the interpretation of the experimental pressure data in terms of a planar extensional viscosity. It is suggested that previous interpretations, while yielding viscosity levels that appear reasonable, nevertheless fail to give the qualitative behaviour that might be expected on the basis of predictions from well accepted constitutive models. This, in the authors' opinions, arises because certain fluids, i.e. those that are highly tension-thickening, cease to flow in accordance with the assumed kinematics at high flow rates. By adapting a recently proposed approximate analysis for flow through a contraction it is shown that better qualitative behaviour, for the planar extensional viscosity, can be obtained from the Converging Flow Rheometer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01332853
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Anxiolytic effects of acebutolol and atenolol in healthy volunteers with induced anxiety (1988)
    Springer
    Psychopharmacology 95 (1988), S. 245-249 
    Details
    ISSN: 1432-2072
    Keywords: State anxiety ; Anxiety induction ; Acebutolol ; Atenolol ; Stroop ; Syntactic reasoning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Acebutolol (400 mg once daily), atenolol (100 mg once daily) and placebo were self administered to 12 healthy male volunteers in a double-blind crossover study. Each drug treatment was administered for 4 days so that subjects' plasma levels of the drug were at steady state. Subjects were tested on the 4th day. On each of the 3 test days subjects underwent an anxiety induction procedure involving both easy and difficult versions of the Stroop test and syntactic reasoning. Measures of state anxiety were taken during the difficult task, an easy version of the task and after a period of quiet relaxation. High, medium and low levels of anxiety corresponded to the three levels of task difficulty. Highly significant differences were exhibited in state anxiety between high, medium and low anxiety induction procedures with both Stroop test and syntactic reasoning. This was shown by highly significant main effects for task difficulty with both tasks. There was no significant anxiolytic action of either acebutolol or atenolol when compared to placebo (there were no drug effects or any interaction of drugs with task difficulty). There were no significant drug effects upon any of the cognitive test measures. Overall, there was no evidence of either anxiolysis or sedation with either of these two relatively hydrophilic drugs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00174517
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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