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  • Reverse phase chromatography  (1)
  • nonlinear oscillations  (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
    Separation of T-MAZ ethoxylated sorbitan fatty acid esters by reverse phase chromatography (1994)
    Springer
    Chromatographia 38 (1994), S. 337-341 
    Details
    ISSN: 1612-1112
    Keywords: Reverse phase chromatography ; Sorbitan fatty acid esters ; Polyethylene glycol ; T-MAZ oligomers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The method for determination of T-MAZ ethoxylated sorbitan fatty acid esters is described. This work demonstrates that with a less retentive C8 alkyl bonded phase packing, reverse phase chromatography can be used to analyze nonionic polymer mixtures with a molecular weight range of 900 to 1500. Using a gradient elution, a complete separation of T-MAZ oligomers was achieved, comparable to that obtained by Supercritical Fluid Chromatography (SFC). Isocratic elution is used to quantify T-MAZ and the detection limit is 321 ppm, which is acceptable for polymers with high molecular weights and no UV-absorbing chromophores. This work also shows the comparison of the separations of T-MAZ using gel permeation chromatography and reverse phase chromatography.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02269777
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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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