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  • Non-suppressed conductivity detection  (1)
  • parametric and forcing excitation  (1)
  • Springer  (2)
  • American Association for the Advancement of Science
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  • Springer  (2)
  • American Association for the Advancement of Science
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  • 1
    Electronic Resource
    Electronic Resource
    Determination of carboxylic acids by ion-exclusion chromatography with non-suppressed conductivity and optical detectors (1993)
    Springer
    Chromatographia 35 (1993), S. 139-141 
    Details
    ISSN: 1612-1112
    Keywords: Ion exclusion chromatography ; Carboxylic acids ; Non-suppressed conductivity detection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Determination of carboxylic acids using non-suppressed conductivity and UV detections is described. The background conductance of 1-octanesulfonic acid, hexane sulfonic acid and sulfuric acid at varying concentrations was determined. Using 0.2 mM 1-octanesulfonic acid as a mobile phase and an injection volume of 300 μl, the detection limits range from 1 μM for formic acid to 10 μM for butyric acid. The conductivity detector was connected in tandem with a Waters 484 optical detector at 210 nm, which allowed the analysis of carboxylic acids from 0.01 mM to 10 mM. The dependence of the retention of carboxylic acids on the eluent pH is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02269692
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  • 2
    Electronic Resource
    Electronic Resource
    Local and global bifurcations of valve mechanism (1994)
    Springer
    Nonlinear dynamics 6 (1994), S. 301-316 
    Details
    ISSN: 1573-269X
    Keywords: Valve mechanism of internal combustion engine ; parametric and forcing excitation ; nonlinear oscillations ; local and global bifurcations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In this paper we study in detail problems of nonlinear oscillations of valve mechanism at internal combustion engine. The practical measurement indicates that stiffness of valve mechanism is not constant but is a function of the rotational angle of the cam. For simplicity of analysis we replace valve mechanism of internal combustion engine with a nonlinear oscillator of single degree of freedom under combined parametric and forcing excitation. We use the method of multiple scales and normal form theory to study local and global bifurcations of valve mechanism at internal combustion engine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00053388
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    Paper (German National Licenses)
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