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  • 1
    Electronic Resource
    Electronic Resource
    Simulating the motion of the leech: A biomechanical application of DAEs (1998)
    Springer
    Numerical algorithms 19 (1998), S. 1-12 
    Details
    ISSN: 1572-9265
    Keywords: Lagrange's equations of motion ; viscoelasticity ; semi-explicit methods ; 92C10
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract In this paper a mathematical model is developed for the dynamical behaviour of a hydrostatic skeleton. The basic configuration is taken from the worm-like shape of the medicinal leech. It consists of a sequence of hexahedra with damped elastic springs as edges to model the various parts of the musculature. The system is stabilized by the constraint of constant volume either in the whole body or in prescribed compartments. We set up Lagrange's equations of motion with the Lagrange multipliers being the pressure values in the compartments. The equations of motion lead to a large differential-algebraic system which is solved by an application of semi-explicit numerical methods. Though the model has not yet been adapted to experimental data, first simulations with a simplified set of parameters show that it is capable of generating basic movements of the leech such as crawling and swimming.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019146221279
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  • 2
    Electronic Resource
    Electronic Resource
    Experimentelle Prüfung von Näherungsansätzen für Chiralitätsfunktionen am Beispiel der optischen Aktivität von Methan-Derivaten im Transparenzgebiet (1973)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 85 (1973), S. 21-27 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die optisch Aktivität eignet sich für detaillierte Aussagen über Konfiguration und Konformation bei Methan-Derivaten,wenn man die Chiralitätsfunktion nach der Theorie der Chiralitätsfunktionen und quantenmechanischen Theorie der optischen Aktivität der Methan-Derivate in ihre Komponenten zerlegt und diese mit dem experimentellen Ergebnis vergleicht. Im vorliegenden Beitrag wird ein erster Schritt in diese Richtung unternommen und gezeigt, daß das zweite Näherungsverfahren für die Bestimmung des konformationsunabhängigen Beitrage zur optischen Aktivität quantitativ gute Resultate liefert. Die Beschreibung des gesamten optischen Drehwinkels durch diese Komponente wird erwartungsgemäß für solche Derivate schlecht, wo spezifische Konformationen durch Wechselwirkung zwischen den Liganden, wie z. B. Wasserstoffbrückenbindungen. bevorzugt auftreten. Ein quantitatives Verständnis für solche Zusatzeffekte erscheint unter Verwendung von Analysen der hier beschriebenen Art aussichtsreich.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19730850105
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  • 3
    Electronic Resource
    Electronic Resource
    Synthese von α-Vinyl-P,P′-ethylenbis(diorganophosphanen) (1982)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 94 (1982), S. 932-933 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19820941224
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  • 4
    Electronic Resource
    Electronic Resource
    Herstellung von 2-Vinylphosphiranen (1982)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 94 (1982), S. 298-298 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: No Abstract.Das vollständige Manuskript dieser Zuschrift erscheint in: Angew. Chem. Suppl. 1982, 739-743
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19820940416
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  • 5
    Electronic Resource
    Electronic Resource
    Semiempirical Use of Chirality FunctionsE. Ruch and A. Schönhofer, Theor. Chim. Acta 10, 91(1968).E. Ruch and A. Schönhofer, Theor. Chim. Acta 19, 225 (1970). for the Description of the Optical Activity of Methane Derivatives in the Transparent Region (1973)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 12 (1973), S. 30-36 
    Details
    ISSN: 0570-0833
    Keywords: Chirality functions ; Optical activity ; Methane derivatives ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The optical activity can provide detailed information about the configuration and conformation of methane derivatives if the chirality function is resolved, according to the theory of chirality functions[3] and the quantum mechanical theory of the optical activity of methane derivatives[4], into its components which are compared with experimental data. A first step in this direction is undertaken in the present article and it will be shown that the second approximation method for determining the conformationally independent contribution to the optical activity yields quantitatively good results. Description of the overall optical rotation by this component is expectedly poor where interactions between ligands, e. g. hydrogen bonding, tend to favor specific conformations. A quantitative understanding of such additional effects appears promising in conjunction with analyses of the kind described.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.197300301
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  • 6
    Electronic Resource
    Electronic Resource
    Herstellung von 2-Vinylphosphiranen (1982)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 21 (1982), S. 739-743 
    Details
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.198207390
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  • 7
    Electronic Resource
    Electronic Resource
    Synthesis of 2-Vinylphosphiranes (1982)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 21 (1982), S. 292-293 
    Details
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: No Abstract.The complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982, 739. DOI:10.1002/anie.198207390
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.198202922
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesis of α-Vinyl-P,P′-ethylenebis(diorganophosphanes) (1982)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 21 (1982), S. 919-920 
    Details
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.198209192
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