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  • 11
    Electronic Resource
    Electronic Resource
    Microstructural aspects of non-homogeneity of grain-boundary sliding (1993)
    Springer
    Journal of materials science 28 (1993), S. 6767-6773 
    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 Direct observation in the scanning electron microscope of grain-boundary sliding (GBS) in Pb-62%Sn eutectic alloy, superplastically deformed in shear, showed non-uniformity of GBS. Such non-homogeneity of GBS reveals itself as sliding of large grain blocks with dimensions of tens of grain size and sliding of grain groups with dimensions of a few (four to eight) grain size. Sliding of large blocks of grains is a result of the sliding of grains as an entity along grain boundaries of former dendritic boundaries. The sliding of grain groups is due to the cooperative manner of GBS. Experimentally observed size of the grain groups can be explained from the view point of cooperative GBS, caused by glide of cellular dislocations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00356429
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  • 12
    Electronic Resource
    Electronic Resource
    Modelling in magnesium alloy with superplastic layer: implications for shear in fault zones induced in olivine by phase transformation (1994)
    Springer
    Journal of materials science 29 (1994), S. 5177-5182 
    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 Analysis of a recently discovered high-pressure phase-transformation-induced mechanism of shear failure in Mg2Ge04 olivine has produced evidence that sliding in the resulting fault zone is accomplished by superplastic flow of the extremely fine-grained high-density phase produced during the transformation. This failure mechanism is of interest because it may be the mechanism by which deep earthquakes are generated in the earth's mantle. To gain insight into this process, we have conducted model tensile experiments on coarse-grained, non-superplastic, specimens of Mg-15%Mn-0.3%Ce alloy, within which a fine-grained, superplastic, planar zone was fabricated at an orientation of 45 ° to the stress axis. Flow was largely restricted to shear offset within the superplastic zone. The experiments were interrupted periodically and microstructural observations were made. Repeated detailed observation of several regions at different strain levels showed that the main mechanism of shear operative in the superplastic region was grain-boundary sliding occurring in a layer-by-layer manner. The common features of microstructural change observed in the magnesium alloy and in the Mg2Ge04 olivine fault zones suggests that such cooperative grain-boundary sliding could be the mechanism of fault propagation in the deep earth and therefore important for understanding deep-focus earthquakes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01151113
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  • 13
    Electronic Resource
    Electronic Resource
    Measurements of spacing of sliding grain boundaries (1994)
    Springer
    Journal of materials science 29 (1994), S. 3607-3611 
    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 spacing of grain boundaries at which grain boundary sliding (GBS) had occurred during superplastic (SP) deformation was determined by measuring the length of segments of marker lines inscribed on the pre-polished surface in Pb-62%Sn after superplastic deformation in shear. Statistical distribution of this segment length (L) was bimodal at low strain levels, but became unimodal at high strain levels. The concept of cooperative GBS, i.e. sliding of groups of grains as an entity, has been invoked to explain the evaluation of the L-distribution with strain. This investigation suggests that the real spacing of sliding grain boundaries should be taken into account for modelling of SP flow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00357325
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  • 14
    Electronic Resource
    Electronic Resource
    Mathematical simulation of bioseparation in an affinity packed column (1994)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 17 (1994), S. 422-429 
    Details
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Affinity chromatography (biospecific adsorption) relies on specific interactions of biological molecules such as enzymes, antigens, antibodies, and proteins. The process consists of three steps: adsorption, washing, and elution. A mathematical model including convection, diffusion, and reversible reaction is formulated to analyse the breakthrough behaviour of the solute. A moving finite element orthogonal collocation method is applied with respect to the space variables of the governing partial differential equations of the model to evaluate the breakthrough of the solute. Danckwerts' boundary conditions are considered for the column. The validity of the numerical scheme is checked by comparison with an analytical solution for a simplified model. The results obtained from model simulation show that the breakthrough time of the solute is significantly influenced by the axial dispersion coefficient, solute concentration, ligand content, reaction kinetics, particle porosity, particle size, and flow rate. Solute recovery and bed utilisation efficiencies are evaluated for different values of the above parameters.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ceat.270170610
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  • 15
    Electronic Resource
    Electronic Resource
    Thermal studies on brominated atactic polypropylene (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 44 (1992), S. 773-779 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Thermal behavior of brominated atactic polypropylene (BAPP), obtained by thermal bromination of atactic polypropylene (APP), was evaluated by thermogravimetric analysis (TGA) and differential thermal analysis (DTA). It was found that the initial decomposition temperature (IDT) and char yield increase with the increase in bromine content while integral procedural decomposition temperature (IPDT) showed a decreasing trend. A comparative study of these value in inert and oxidative atmospheres has been made. DTA study shows that onset decomposition temperature (ODT) and glass transition temperature (Tg) increase with the increase in degree of bromination. The possible reasons for the occurring phenomena have been discussed.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1992.070440504
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  • 16
    Electronic Resource
    Electronic Resource
    Adhesion studies of tyre cords with rubber. I. Synthesis and characterization of natural rubber graft copolymers (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 44 (1992), S. 233-238 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Glycidyl methacrylate and N-vinyl pyrrolidone have been grafted onto natural rubber at 32°C using the simultaneous cobalt-60 irradiation technique. The natural rubber samples were swollen in the monomers for 24 h and thereafter subjected to gamma irradiation. The homopolymers formed in the graft copolymerization reactions and unreacted monomer were removed by solvent extraction using acetone and methanol for glycidyl methacrylate and N-vinyl pyrrolidone monomer, respectively. The influence of total dose and monomer concentration on the graft parameters was investigated. The dependence of the rate of grafting on the monomer concentration was found to be 0.93 and 0.80 for glycidyl methacrylate and N-vinyl pyrrolidone, respectively. DSC and TGA studies of the polymers were undertaken. Grafted copolymers based on glycidyl methacrylate were relatively less thermally stable compared with ungrafted natural rubber.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1992.070440206
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  • 17
    Electronic Resource
    Electronic Resource
    Electrical properties of chlorinated atactic polypropylene (CAPP) and PVC-DOP-CAPP system (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 39 (1990), S. 1485-1493 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The electrical properties, such as dielectric properties and volume resistivity, of chlorinated atactic polypropylene(CAPP), obtained by thermal chlorination of APP, have been studied. The results show that dielectric constant, loss tangent, and volume resistivity of the chlorinated samples increase with the increase in degree of chlorination. The effect of CAPP as secondary plasticizer in the PVC-DOP system has also been studied. Dielectric study of PVC compounds shows a single relaxation peak, indicating no phase separation. In the case of PVC compounds, it has been observed that with the increase in CAPP content in PVC compounds dielectric constant and loss tangent decrease whereas volume resistivity increases. The increase in volume resistivity was further supported by the increase in activation energy value, obtained from volume resistivity vs. 1/T plot.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1990.070390707
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