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  • 1
    Electronic Resource
    Electronic Resource
    The use of MULTAN to locate the positions of anomalous scatterers (1989)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 45 (1989), S. 715-718 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Observed anomalous scattering differences have been used with the direct-methods program MULTAN87 to determine the positions of anomalous scatterers in a variety of metalloproteins and a small molecule. The lack of anomalous differences in the centric data did not prevent the determination of the atom positions and the anomalous scatterers were found in all cases. These results show that the method may be useful to determine the positions of anomalous scatterers in the case of multi-site genetically engineered proteins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767389006239
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  • 2
    Electronic Resource
    Electronic Resource
    Two new ruthenium(II) complexes involving two different chelation modes of partially chlorinated 2-(benzylthio)azobenzene (1986)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 42 (1986), S. 793-796 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270186094519
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  • 3
    Electronic Resource
    Electronic Resource
    Microstructural aspects of superplasticity (1985)
    Springer
    Journal of materials science 20 (1985), S. 2661-2686 
    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 microstructural aspects of the superplastic phenomenon are reviewed. The experimental results of a very large number of investigations are critically analysed in the context of: grain shape and size; grain growth; grain boundary sliding and migration, grain rotation and rearrangement; diffusion and dislocation activity. It is shown, that in spite of often conflicting evidence in the literature, a common pattern of microstructural behaviour emerges for all the materials and conditions investigated to date.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553028
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  • 4
    Electronic Resource
    Electronic Resource
    Particle characterization and cavity nucleation during superplastic deformation in Al-Li-based alloys (1988)
    Springer
    Journal of materials science 23 (1988), S. 3509-3514 
    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 role of intermetallic particles on the cavity formation during superplastic deformation has been studied in two aluminium-lithium-based alloys of identical chemical composition. They were, however, manufactured by two different routes — one by ingot metallurgy (IM) and the other by rapid solidification powder metallurgy (PM). A large number of particles of different shapes and sizes were found in both the alloys. In the IM alloy, particles were aligned in stringers in the direction of rolling. Iron and silicon, which were present as impurity elements, formed intermetallic phases in the IM alloy whereas only silicon-rich particles were found in the PM alloy. The particles of the PM alloy were of smaller size and were rather uniformly distributed in comparison to the IM alloy. During superplastic deformation, cavities first nucleated at the interface of large particles. The cavities of the IM alloy formed around the aligned stringers of large particles, whereas in the PM alloy they were uniformly distributed. It is shown that because both alloys contained particles of varying sizes, cavity nucleation occurred continuously during superplastic deformation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00540488
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of triaxial stress-state on creep fracture in Inconel alloy X-750 (1985)
    Springer
    Journal of materials science 20 (1985), S. 1201-1206 
    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 Smooth specimens and circumferentially notched bars with a “Bridgman” notch geometry were tested uniaxially at 700° C in air in the stress range of 340 to 700 MPa. The results indicated that the material was notch strengthened on the basis of net section stress,σ a. However, when the fracture lifetimes were plotted as a function of the Bridgman effective stress,σ e, all the data points fell approximately on one line. Cavity nucleation sites changed systematically from notch throat at the highest stress to notch root at the low stress. The notch rupture ductility in the notched specimens were found to have a lower value than in the smooth ones at all stresses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01026314
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  • 6
    Electronic Resource
    Electronic Resource
    On the evaluation of parameters of the constitutive equation for 7475 Al alloy (1987)
    Springer
    Journal of materials science 22 (1987), S. 459-465 
    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 From the mechanical data on 7475 Al alloy, it is evident that flow stress is significantly dependent on the strain during superplastic flow. This is due to its ability to strain-harden during superplasticity. The rate of increase in the flow stress is much higher at 457° C than at 517° C. This gives rise to non-unique values for the parameters of the constitutive equation. At 457° C, whereas the stress exponent (n) and activation energy for superplastic flow at 1 × 10−4 sec−1 increase only slightly with strain, the grain size sensitivity parameter (p) and structure parameter (A) decrease significantly with strain. These changes in the constitutive parameters are associated with dislocation activity occurring within the grain interior, leading to grain elongation without significant changes in the grain size, through the parameter, (b/d) p , of the constitutive equation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160753
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  • 7
    Electronic Resource
    Electronic Resource
    Radiation-induced graft copolymerization of methacrylic acid onto polypropylene fibers. II. Effect of solvents (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 30 (1985), S. 2655-2661 
    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: Graft copolymerization of methacrylic acid onto polypropylene fibers by simultaneous-gamma ray irradiation technique was carried out. The effect of various solvents on grafting was studied. The results have been presented in terms of swelling behavior of polypropylene fiber and the extent of homopolymerization. An accelerative effect upon the rate of grafting was observed when benzene was partly replaced by methanol. At the dose rate of 24 rad/s and monomer concentration of 3 mol/L, a maximum in the rate of grafting was observed with 40% methanol fraction in the benzene-methanol mixture. However, a further increase in the methanol fraction in the solvent mixture resulted in a sharp decrease in the rate of grafting. No grafting was observed in pure methanol. This behavior has been explained in terms of the inhibitory action of methanol for polymerization of methacrylic acid and the extent of swelling of polypropylene fiber in various compositions of benzene-methanol mixture.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1985.070300628
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  • 8
    Electronic Resource
    Electronic Resource
    Radiation-Induced graft copolymerization of methacrylic acid onto polypropylene fibers. V. Mechanical properties (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 30 (1985), S. 3365-3368 
    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: Mechanical properties of polypropylene-g-poly(methacrylic acid) fibers, prepared by graft copolymerization of methacrylic acid onto polypropylene fiber using simultaneous gamma ray irradiation technique, were evaluated. In general, an improvement in the mechanical behavior of the polypropylene fiber by grafting was observed. Denier and initial modulus of the fiber showed a linear increase with the percent graft, and elongation showed an opposite trend. The results have been explained in terms of reinforcing effect of poly(methacrylic acid) grafts and reduction in the segmental mobility of the polymeric chains. Tenacity also increases up to certain graft level, beyond which a sharp decrease occurs, probably due to the influence on the compactness of the macromolecular chains with the further grafting.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1985.070300818
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  • 9
    Electronic Resource
    Electronic Resource
    Radiation-induced graft copolymerization of methacrylic acid onto polypropylene fibers. I. Effect of synthesis conditions (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 30 (1985), S. 2643-2653 
    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 gamma radiation-induced graft copolymerization of methacrylic acid onto polypropylene fibers was investigated by simultaneous - irradiation technique. The effect of various synthesis conditions on the graft content was studied. At a constant dose, the percent grafting was found to be higher at low dose rate. For all the dose rates, a linear increase in the grafting was observed up to 0.25 Mrad, beyond which the grafting levelled off. Percent grafting also increased continuously with increasing monomer concentration up to 4.0 mol/L, but a linear increase in grafting was observed only up to 2.0 mol/L. The initial rate of grafting increased with the increase in dose rate and monomer concentration. The dependence of rate of grafting on dose rate and monomer concentration was found to be 0.70 and 1.71, respectively. The effect of liquor ratio upon grafting was also studied.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1985.070300627
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  • 10
    Electronic Resource
    Electronic Resource
    Radiation-induced graft copolymerization of methacrylic acid onto polypropylene fibers VI. Dyeing behavior (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 30 (1985), S. 4455-4466 
    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 dyeing behavior of polypropylene-g-polymethacrylic acid fibers prepared by graft copolymerization of methacrylic acid onto polypropylene fibers by gamma-ray irradiation was evaluated for their dyeability characteristics using two basic dyes, rhodamine B and methylene blue. An increase in the dye uptake and moisture regain with the increase in graft content was observed. Such behavior has been attributed to the hydrophilicity imparted to polypropylene fiber by the presence of polar carboxyl groups in polymethacrylic acid grafts. The dependence of rate of dyeing on the percentage graft was evaluated. The diffusion coefficient of the fiber showed an increase with the increase in graft content and has been related to the structural changes occurring during grafting.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1985.070301119
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