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  • 2000-2004
  • 1985-1989  (3)
  • expansivities  (2)
  • thermal expansion  (2)
  • Platelets  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Increased platelet thromboxane receptor sensitivity in diabetic patients with proliferative retinopathy (1986)
    Springer
    Diabetologia 29 (1986), S. 471-474 
    Details
    ISSN: 1432-0428
    Keywords: Platelets ; thromboxane sensitivity ; cAMP ; proliferative retinopathy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Platelet aggregation to collagen in 12 Type 1 (insulin-dependent) diabetic patients with background retinopathy and 12 Type 1 diabetic patients with proliferative retinopathy was compared with an age- and sex-matched control group. An analogue of prostaglandin H2, 11,9 epoxymethano-prostaglandin H2, which directly stimulates thromboxane receptors, and EP 092, which is a competitive thromboxane A2 receptor antagonist, were used to investigate changes at platelet thromboxane receptor level in these groups. The concentration of collagen (EC50) required to give 50% of maximum aggregation did not differ between the two diabetic groups and the control group. However, platelets from the proliferative retinopathy group were significantly more sensitive to the thromboxane mimetic (11,9 epoxymethano-prostaglandin H2) (p 〈 0.005) than the background retinopathy and control groups. This change may be a factor in the development of proliferative retinopathy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00453495
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal expansion properties of 6061 Al alloy reinforced with SiC particles or short fibers (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 861-871 
    Details
    ISSN: 1572-9567
    Keywords: 6061 Al-SiC composites ; coaxial cylinder model ; elastic-plastic concentric-spheres model ; expansivities ; thermal cycling ; thermal expansion ; thermal stresses ; thermally induced plasticity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Thermal expansion measurements are reported for 6061 Al alloy and drawn composite materials reinforced with SiC particles or aligned short fibers. Samples with volume fractions of 5 and 20% SiC were measured in the drawing direction. The measurements were obtained from repeated heating and cooling cycles between room temperature and 500°C. Cumulative plastic strains were measured for the repeated thermal cycles, in association with the observation that lower expansivities generally occurred on cooling as compared with heating. Model calculations for particulate and an aligned fiber are presented for the combined elastic-plastic deformation properties of the Al/SiC composite systems. Lower expansivities and greater plastic strains are accounted for in the fiber-reinforced material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503251
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Internal stress and solid solubility effects on the thermal expansivity of Al-Si eutectic alloys (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 179-193 
    Details
    ISSN: 1572-9567
    Keywords: Al-Si eutectic alloys ; concentric-spheres model ; expansivities ; solid solubility ; thermal cycling ; thermal expansion ; thermal stresses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Thermal expansion measurements are reported for a number of as-cast Al-Si eutectic alloys including a Sr-modified alloy which gives nearly spherical Si particles. The measurements were obtained by heating and cooling over repeated temperature cycles between room temperature and 500°C. In general, lower expansivity values were measured on the cooling cycle as compared with the heating cycle, resulting in a net positive permanent deformation at room temperature. Analytical solutions are described for the thermal expansivity of a concentric-spheres model for a Si particle contained within an Al matrix. The effect of plastic flow in the Al is included. Overall, the predictions show reasonable agreement with the measured expansivities. The observed differences between heating and cooling are of the same order as that which is predicted. At high temperatures, the measured increase in expansivities is smaller than calculated. The latter effect is explained by the decrease in expansivity which results from an increasing solid solubility of silicon in aluminum with increasing temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00504238
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    Paper (German National Licenses)
    Fulltext
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