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  • Polymer and Materials Science  (2)
  • Ageing  (1)
  • CFD (computational fluid dynamics)  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Flexibility of the shoulder joint measured as range of abduction in a large representative sample of men and women over 65 years of age (1989)
    Springer
    European journal of applied physiology 58 (1989), S. 353-360 
    Details
    ISSN: 1439-6327
    Schlagwort(e): Age ; Ageing ; Flexibility ; Health ; Customary activity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary In a representative survey of 1000 elderly men and women aged over 65 years living in their own homes, assessments have been made of flexibility measured as range of shoulder abduction in addition to health status, psychological well-being and reported customary activity. The results for shoulder abduction were approximately normally distributed and the mean values (±1 standard deviation) were as follows: — in men aged 65–74 years, 129 (±14)° and aged over 74 years, 121 (±19)°; in women aged 65–74 years, 124 (±19)° and aged over 74 years, 114 (±22)°. These mean values are about 30° less than those accepted for younger subjects. Nearly half the distribution falls below the accepted threshold level of 120° for adequate function. There were significant effects of sex and age (P〈0.001); women had poorer flexibility and the reduction with age amounted to 10° per decade. Multiple regression analysis showed that the effect of age was accounted for in part by health, strength and customary use. The effects of use were most marked in those with some disability. This suggests that maintained or increased use could offset some of the age-related loss of the range of shoulder movement.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00643509
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  • 2
    Digitale Medien
    Digitale Medien
    Polymer concentration effects on helix-coil transition widths (1974)
    New York : Wiley-Blackwell
    Biopolymers 13 (1974), S. 2103-2115 
    Details
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A theoretical study of effects of excluded volume intermolecular interactions on the sharpness of helix-coil transitions in solutions of polyamino acids or simple proteins indicates that the transition width may vary appreciably as a function of polymer concentration. The analysis is based on a second virial approximation for the excess free energy of mixing of a solution of polymers of varying degrees of helicity. The virial coefficients involved are roughly estimated on the basis of gross polymer geometry. For large N (degree of polymerization) the transition is found, typically to sharpen with increasing concentration, becoming second order and then first order at sufficiently high concentrations. The critical polymer concentration is found to be roughly of the order N-1.2 d0-1 for an “all or none” model and of order σ1/2 N-0.2 d0-1 for a model with continuously variable degree of helicity (d0 is the volume of a single helical molecule and σ1/2 the normalized statistical weight of a helix-coil interface). In the second case for N ∼ 103 and σ ∼ 10-2-10-4, the predicted critical concentration is in the range 10-1-10-3 g/cm.3 Comparison is made with experiments on solutions of poly(γ-benzyl-L glutamate).
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bip.1974.360131012
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  • 3
    Digitale Medien
    Digitale Medien
    The effects of overall composition and monomer sequence distribution on the infrared carbonyl stretching frequencies of ethylene-vinylacetate and styrene-vinylacetate copolymers (1979)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 17 (1979), S. 2783-2790 
    Details
    ISSN: 0360-6376
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The vinyl acetate centered triad fractions of some free radically prepared ethylene-vinyl acetate and styrene-vinyl acetate copolymers have been determined from the patterns of vinyl acetate methine carbon peaks in their 13C nuclear magnetic resonance (NMR) spectra. The positions and shapes of the carbonyl bands in the infrared (IR) absorption spectra of the copolymers recorded in chloroform are shown to depend on the compositions of the copolymers and on the proportions of the various vinyl acetate centered triads. Infrared absorption measurements may thus be used in part to characterize the monomer sequence distributions of these copolymers.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1979.170170915
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  • 4
    Digitale Medien
    Digitale Medien
    A general algorithm for compressible and incompressible flow - Part II. tests on the explicit form (1995)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 20 (1995), S. 887-913 
    Details
    ISSN: 0271-2091
    Schlagwort(e): compressible flow ; CFD (computational fluid dynamics) ; finite elements in fluids ; Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Notizen: The algorithm introduced in Part I of this paper is applied in its explicit form to a variety of problems in order to demonstrate its wide range of applicability and excellent performance. Examples range from nearly incompressible, viscous, flows through transonic applications to high speed flows with shocks. In most examples linear triangular elements are used in the finite element approximation, but some use of quadratic approximation, again in triangles, indicates satisfactory performance even in the case of severe shocks.
    Zusätzliches Material: 23 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/fld.1650200813
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