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  • 1980-1984  (8)
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Material
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Year
  • 1
    facet.materialart.
    Unknown
    The Changing Household Size in India (1984)
    Leiden : Periodicals Archive Online (PAO)
    Journal of Asian and African Studies. 19:1/2 (1984:Jan./Apr.) 86 
    Details
    ISSN: 0021-9096
    Topics: Ethnic Sciences , History , Political Science , Sociology , Economics
    Notes: Research Communications
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:n207-1984-019-01-000008
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  • 2
    Electronic Resource
    Electronic Resource
    Growth factors adherent to cell substrate are mitogenically active in situ (1982)
    [s.l.] : Nature Publishing Group
    Nature 296 (1982), S. 154-156 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] PDGF was purified to homogeneity and radioiodinated as described in Table 1 legend. Binding studies with 125I-PDGF (see Table 1 legend) showed that the radiolabelled material binds to specific receptors on the surface of confluent BALB/c-3T3 cell monolayers. We and others7 have found that most of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/296154a0
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  • 3
    Electronic Resource
    Electronic Resource
    Observations on the nature of micro-cracking in brittle composites (1981)
    Springer
    Journal of materials science 16 (1981), S. 141-150 
    Details
    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 degree of micro-cracking in BeO-SiC composites due to internal stresses which arise from the mismatch in the coefficients of thermal expansion was monitored by measurements of the thermal diffusivity by the laser-flash technique. The experimental results indicated that micro-cracking was most extensive at approximately 30 and 80 wt% SiC and a minimum at nearly 50 wt% SiC. A theoretical analysis indicated that the magnitude of internal stress increases linearly with SiC content, so that the above observations cannot be attributed to a low internal stress state at ~ 50 wt% SiC. Instead, this effect can be attributed to changes in the statistical variables affecting the brittle fracture as well as the degree of internal stress relaxation. Both these factors are thought to be controlled by the nature of multiaxial stress distribution. At ~ 50 wt% SiC-content, due to anticipated non-hydrostatic triaxial stress distribution, residual stress relaxation is possible in both the components of the composite. However, at low and high fractions of SiC content, such stress relaxation is less likely to occur due to the expected hydrostatic stress distribution in one of the components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00552068
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of bath and specimen temperature on the thermal stress resistance of brittle ceramics subjected to thermal quenching (1981)
    Springer
    Journal of materials science 16 (1981), S. 2109-2118 
    Details
    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 effect of specimen and bath temperature on the failure of brittle ceramics in a thermal quench experiment was studied by quenching glass and alumina rods in water and silicon oil baths at different temperatures. The results were discussed in terms of the variation of heat transfer coefficient of the quenching media and the change in material properties as a function of temperature. It was found that the usual assumption of constant heat transfer coefficient and material properties may lead to considerable errors in the quantitative interpretation of the results of thermal quench experiments. Effective values for the film coefficient of heat transfer for water and oil baths were estimated as a function of film temperature from thermal quench data. Recommendations were made for the selection of quenching media and for the procedure to be followed in reporting the results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00542371
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  • 5
    Electronic Resource
    Electronic Resource
    LRS Bianchi type-V universes filled with matter and radiation (1983)
    Springer
    Astrophysics and space science 96 (1983), S. 303-312 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper we have investigated some LRS Bianchi type-V cosmologicla models representing a viscous fluid distribution with a null electromagnetic field and streaming neutrinos. Various physical and kinematical features of these models have also been explored.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00651674
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  • 6
    Electronic Resource
    Electronic Resource
    Analysis of thermal fatigue behaviour of brittle structural materials (1981)
    Springer
    Journal of materials science 16 (1981), S. 2789-2797 
    Details
    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 effect of the level of maximum temperature (T max), the temperature range (ΔT) and the mode of convective heat transfer on the thermal fatigue resistance of brittle structural materials is analysed. Expressions are derived for the number of thermal cycles to failure in terms of the appropriate mechanical and thermal properties, crack growth parameter, ΔT andT max. For simultaneous changes inT max and ΔT commonly used in practice, the change in thermal fatigue life is governed by both the thermal stress intensity exponent (n) and the activation energy (Q) for subcritical crack growth, in contrast to the results of other studies. For constantT max but variable ΔT, thermal fatigue life is affected byn only, whereas, for constant ΔT but variableT max, the value ofQ alone governs changes in fatigue-life. Heat transfer by natural or forced convection will result in differences in thermal fatigue resistance. Recommendations are made for the design and analysis of thermal fatigue experiments. Figures-of-merit for the selection of materials with high thermal fatigue resistance are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00552963
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  • 7
    Electronic Resource
    Electronic Resource
    Analysis of thermal fatigue behaviour of brittle structural materials (1981)
    Springer
    Journal of materials science 16 (1981), S. 2789-2797 
    Details
    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 effect of the level of maximum temperature (T max), the temperature range (ΔT) and the mode of convective heat transfer on the thermal fatigue resistance of brittle structural materials is analysed. Expressions are derived for the number of thermal cycles to failure in terms of the appropriate mechanical and thermal properties, crack growth parameter, ΔT andT max. For simultaneous changes inT max and ΔT commonly used in practice, the change in thermal fatigue life is governed by both the thermal stress intensity exponent (n) and the activation energy (Q) for subcritical crack growth, in contrast to the results of other studies. For constantT max but variable ΔT, thermal fatigue life is affected byn only, whereas, for constant ΔT but variableT max, the value ofQ alone governs changes in fatigue-life. Heat transfer by natural or forced convection will result in differences in thermal fatigue resistance. Recommendations are made for the design and analysis of thermal fatigue experiments. Figures-of-merit for the selection of materials with high thermal fatigue resistance are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02402843
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  • 8
    Electronic Resource
    Electronic Resource
    Observations on the characteristics of a fluidized bed for the thermal shock testing of brittle ceramics (1982)
    Springer
    Journal of materials science 17 (1982), S. 2553-2559 
    Details
    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 heat transfer characteristics of a fluidized bed used as a quenching medium for the thermal stress testing of brittle ceramics, were determined by measurements of the thermal shock behaviour of rods of a soda-lime—silica glass. The heat transfer coefficient was found to be strongly dependent on the mean particle size of the powder and air flow rate, and was relatively independent of the position within the bed. The results indicate that the heat transfer coefficient during thermal shock fracture may have a value lower than that obtained under heat transfer conditions which more closely resemble steady state. The heat transfer data inferred from the quenching experiments with the glass gave excellent agreement between calculated and measured values for the thermal shock behaviour for rods of a polycrystalline aluminium oxide. It is concluded that fluidized beds are excellent inert quenching media with variable heat transfer coefficient controlled by particle size and flow rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00543887
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