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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Mechanisms of Ageing and Development 27 (1984), S. 83-86 
    ISSN: 0047-6374
    Keywords: Age ; Lymphocytes ; Somatic mutation
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Scandinavian journal of immunology 19 (1984), S. 0 
    ISSN: 1365-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Limiting-dilution cloning of human lymphocytes was used to study cloning and proliferation of lymphocytes in 10 young and 10 elderly individuals. The cloning efficiency for elderly individuals, 3.5%, was significantly lower than that for young individuals, 19.8%. Mixing experiments showed that this decrease was due to both a decrease in the frequency of the clone-forming cells and a decrease in the interacting ability of the lymphocytes. Lymphocytes from elderly individuals which did form clones, however, proliferated at the same rate as did those from young individuals.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Experimental astronomy 3 (1994), S. 127-129 
    ISSN: 1572-9508
    Keywords: Infrared ; Polarimetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new infrared imaging polarimeter operating in dual-beam mode is described, together with some of the early results.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 31 (1996), S. 1183-1197 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The influence of reprocessing by injection moulding on properties of polycarbonate has been studied. It was found that reprocessing reduces the mean fibre length and increases the melt flow index. There was no variation in tensile or flexural properties with the number of reprocessing cycles. Fracture toughness, K c, measured via notched tensile and flexural bars indicated that the material toughness is affected by the number of reprocessing cycles. The effect was more pronounced in bending than in tension. Strain energy release rate, G c, was found not to be affected significantly by the number of reprocessing cycles. Although, as the material was reprocessed, fracture parameters were always lower than that of the virgin unprocessed material. The influence of reprocessing on weld-line properties was also investigated using notched tensile specimens. It was found that whereas tensile strength is not affected by the presence of the weld-line, fracture toughness deteriorated significantly, giving a weld-line integrity factor, F, of 0.75. The value of F was not affected significantly by the number of reprocessing cycles.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 33 (1998), S. 4491-4501 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The dependence of the various mechanical and fracture properties on the volume fraction ofshort glass fibres in the styrene maleic anhydride (SMA) polymer was investigated. Special attention has been given to describing the dependence of various mechanical properties on the volume fraction of the glass fibres, ϕf by way of the rule of mixtures. It was found that, strength, elastic modulus and fracture toughness, all follow a simple rule-of-mixtures of the form Qc=λQfϕf+Qm(1−ϕf), where Qc is the measured quantity for the composite, Qm and Qf are the corresponding values for the matrix and the fibre, respectively, and λ is the overall efficiency of the fibres, taking into account the orientation and the length of the fibres in the composite. It was also found that, while the presence of the weldline had no significant effect upon elastic modulus, its presence significantly reduced tensile strength and the fracture toughness of SMA and its composites. © 1998 Kluwer Academic Publishers
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 31 (1996), S. 5573-5582 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The influence of reprocessing by injection moulding on properties of polycarbonate has been studied. It was found that reprocessing does not affect the tensile strength, flexural strength and flexural modulus of the polycarbonate material. Fracture parameters such as fracture toughness and the material resistance to crack propagation, also showed no variation with the number of reprocessing cycles, although both were strongly dependent on sample width. Dynamic mechanical analysis (DMA) also indicated that reprocessing has no significant effect upon dynamic mechanical properties of polycarbonate. Results further indicated that the glass transition temperature of polycarbonate is not affected by reprocessing, only the range over which it occurs seems to be broadened by reprocessing due to increase in molecular weight with number of reprocessing cycles.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 33 (1998), S. 1165-1175 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper presents the results from the first part of a study on the influence of reprocessing and weldlines on the properties of styrene maleic anhydride (SMA) polymer. Specimens for this study were injection moulded and reprocessed up to five times. It was found that while mechanical properties such as strength and modulus in both tension and flexure tests were virtually independent of the number of reprocessing cycles, the energy to fracture decreased as a result of reprocessing. Fracture parameters such as fracture toughness and strain energy release rate also showed little variation with reprocessing; although at times a reduction in these parameters was obtained for the fifth cycle. We found that tensile strength, fracture energy and fracture toughness were all reduced substantially in the presence of the weldline. However, none of these properties showed any significant variation with the number of reprocessing cycles. © 1998 Chapman & Hall
    Type of Medium: Electronic Resource
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