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  • 1
    Digitale Medien
    Digitale Medien
    CYCLIC PLASTICITY IN TYPE 316L AUSTENITIC STAINLESS STEEL (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 17 (1994), S. 0 
    Details
    ISSN: 1460-2695
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau
    Notizen: Abstract— The cyclic stress-strain response of two heats of austenitic stainless steel 3 16L was experimentally studied under a wide range of cyclic plastic strain amplitudes. Three domains on the cyclic stress- strain curve were found. In the middle domain the plateau behaviour corresponds to fatigue softening. The domain at low plastic strain amplitudes is characterized by stabilized behaviour and the domain of the highest plastic strain amplitudes by continuous hardening. Individual domains were correlated with observed dislocation structures. The existence of the plateau can be related to the localization of the cyclic strain into persistent slip bands. A Manson-Coffin plot of the material over a wide cyclic amplitude range is curved and can be approximated by a double logarithmic dependence.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1460-2695.1994.tb00808.x
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  • 2
    Digitale Medien
    Digitale Medien
    Addition of tetrachloromethane to alkenes catalyzed by cobalt(II)-amine complex (1993)
    Springer
    Catalysis letters 18 (1993), S. 345-348 
    Details
    ISSN: 1572-879X
    Schlagwort(e): Addition reactions ; cobalt(II) catalyst ; free radicals
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The cobalt(II)-2-methylpropylamine complex is an efficient catalyst for addition of tetrachloromethane to alkenes under mild reaction conditions (80 °C) providing 1 ∶ 1 adducts up to 99.5% yield. Reactions with vinyl monomers provided low yield of 1 ∶ 1 addition products (5–48%) presumably due to radical chain processes favoring telomerization and polymerization.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00765280
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Comparison of the clinical state and its changes in patients with Duchenne and Becker muscular dystrophy with results of in vivo 31P magnetic resonance spectroscopy (1993)
    Springer
    European radiology 3 (1993), S. 499-506 
    Details
    ISSN: 1432-1084
    Schlagwort(e): Becker dystrophy ; Duchenne dystrophy ; High-energy phosphates ; 31P MR spectroscopy ; Principal component analysis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract A total of 14 boys with the Duchenne and Becker forms of muscular dystrophy (DMD, BMD) were examined using 31P magnetic resonance (MR) spectroscopy; 12 boys were examined repeatedly. The results were correlated with clinical findings (including those of genetic tests) and with data obtained from examinations of an age-matched control group. Evaluation of results using principal component analysis revealed maximum variability in the following ratios: phosphocreatine/inorganic phosphate (PCr/Pi), phosphocreatine/phosphodiesters (PCr/PDe) and phosphocreatine/phosphomonoesters (PCr/PMe). A decrease in PCr/Pi correlates with weakness of the hip girdle and of the lower part of the shoulder girdle in DMD/BMD patients. The values of all ratios in the group of patients with the DMD phenotype differ significantly from results obtained in the group with the BMD phenotype. Continoous follow-up of patients using 31P MR spectroscopy revealed a marked decrease in PCr/Pi in DMD/BMD patients at an age that could be expected in subjects with a typical clinical course of DMD/BMD. An attempt to manage a concomitant disease with prednisone and carnitene was followed by an increase in PCr/Pi in 3 cases. A rise in the PCr/Pi ratio signalled clinical improvement in the patients. A decrease in PCr/Pi was found after controlled physical training, a finding consistent with data obtained from clinical observations describing an adverse effect of physical stress on the dystrophic process.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00169597
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