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  • Articles: DFG German National Licenses  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Synthesis of polymer electrolytes with high ion conductivity using experimental design of multicomponent polymer systems (1993)
    s.l. : American Chemical Society
    Industrial & engineering chemistry research 32 (1993), S. 3128-3134 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie00024a024
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    New ill-posed problems in rheology (1996)
    Springer
    Rheologica acta 35 (1996), S. 186-193 
    Details
    ISSN: 1435-1528
    Keywords: Ill-posed problem ; nonlinear regularization ; viscoelasticity ; polymer blend
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Many methods of material characterization by rheological methods lead to ill-posed problems. The nature of ill-posedness is discussed. In this light, some such new problems appearing in molecular weight characterization of homopolymers as well as in the characterization of size distribution of dispersed phases in polymer blends by rheological techniques are analyzed. The working capability of a nonlinear regularization method is demonstrated with examples of blend rheology. The role of Professor Meissner in motivating the research in the field of ill-posed problems as well as his important contribution to rheology of polymer blends is outlined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396045
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of the relaxation time spectrum from dynamic moduli using an edge preserving regularization method (2000)
    Springer
    Rheologica acta 39 (2000), S. 163-173 
    Details
    ISSN: 1435-1528
    Keywords: Key words Viscoelasticity ; Relaxation time spectrum ; BSW spectrum ; Regularization ; Edge preserving regularization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract For the numerical determination of a continuous relaxation time spectrum from rheological data so-called regularization methods are necessary. The regularization method based on Tikhonov regularization and commonly used in rheology assumes the relaxation time spectrum to be smooth. Accordingly, this method is not able to properly resolve spectra containing edges or at least large curvatures as proposed in the literature. In order to reconstruct such spectra a novel edge preserving regularization (EPR) method was developed which extends the properties of the commonly used method. In order to demonstrate the efficiency of EPR it is compared with the commonly used regularization method by means of simulated and experimental data. This reveals that EPR is able to prove whether or not the theoretically predicted edge containing spectra for high-molecular-weight, monodisperse polymers are compatible with experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003970050016
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A master equation investigation of coagulation reactions: Sol-gel transition (1994)
    Weinheim : Wiley-Blackwell
    Macromolecular Theory and Simulations 3 (1994), S. 585-599 
    Details
    ISSN: 1022-1344
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The kinetics of irreversible coagulation phenomena in spatially homogeneous systems is formulated in terms of a multivariate stochastic process. The latter is governed by a master equation for the joint probability distribution of the numbers of reacting species. An efficient numerical algorithm is used to simulate the complete time evolution of the stochastic process. The method is illustrated by simulating the coagulation reaction with configuration-dependent reaction kernels, Kij = (ij)ω, for clusters of mass i and j with 1/2 〈 ω ≤ 1, which are designed to model gelation phenomena. It is demonstrated that the stochastic simulation allows the determination of critical exponents and the gel point directly from the master equation. The results are compared to predictions of the rate equation approach to the sol-gel transition.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mats.1994.040030306
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    Paper (German National Licenses)
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