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  • 1
    Electronic Resource
    Electronic Resource
    Structure of 4,4,5,5-tetramethoxy-2,7-dimethylcyclohepta-2,6-dien-1-one (1990)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 46 (1990), S. 2229-2231 
    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/S0108270190002906
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  • 2
    Electronic Resource
    Electronic Resource
    Azeotropic-like (congruent melting) phenomena of lamellar liquid crystals (1993)
    Springer
    Colloid & polymer science 271 (1993), S. 952-959 
    Details
    ISSN: 1435-1536
    Keywords: Lamellar liquid crystal ; azeotropic point ; congruent melting point
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The binary system of water and didecyldimethylammonium bromide (DDeAB), having a double hydrocarbon chain, was found to exhibit exhibit an azeotropic-like phase transition from lamellar liquid crystal to micellar solution. That is, the maximum limiting value of temperatures where the present system is allowed to exist in a lamellar liquid crystal corresponds to the socalled azeotropic point (AZP) or congruent melting point. At this temperature, the compositions of the liquid crystal and micellar solution phases become identical. Upon addition of a small amount of NaBr, the AZP shifts to a high temperature, but the point disappears above 0.375 wt% NaBr in water. The AZP is also increased by adding cholesterol. On the other hand, the transition enthalpies at AZPs are extremely small and almost constant, even if NaBr and cholesterol are added. The sharp DSC peak is observed in the presence of salt, whereas it is broad in the presence of cholesterol. It is considered that salt induces a closely packed state of the liquid crystal phase. Although cholesterol also has an ordering effect on the surfactant aggregates its hydrophobic property increases the phase transition temperature. The phase transition occurs due to a packing change of the hydrocarbon chains of DDeAB molecule from the lamellar to micellar states. The correlation between the movement of AZP and the phase behavior in the presence of salt is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654855
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  • 3
    Electronic Resource
    Electronic Resource
    Ultrasonic velocity in sodium borate glasses (1991)
    Springer
    Journal of materials science 26 (1991), S. 4048-4053 
    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 Ultrasonic velocities in sodium borate glasses are measured as a function of composition at a frequency of 10 MHz and at a temperature of 298 K by making use of the ultrasonic pulse echo overlap method. Elastic properties of these glasses are analysed in terms of the elastic internal energy due to deformation; elastic resistances of the network-former, B2O3, and the modifier, Na2O, are obtained as a function of composition from the plot ofMV 2 againstx 2, whereM is the molar mass of sodium borate glasses,V the velocity of sound andx 2 the mole fraction of Na2O. The elastic resistances of B2O3 and Na2O are as follows: (i) forx 2〈0.33, the elastic resistance of B2O3 is smaller than that of Na2O; (ii) atx 2=0.33, the elastic resistances of B2O3 and Na2O are equal; (iii) forx 2〉0.33, the elastic resistance of B2O3 is greater than that of Na2O; (iv) atx 2≈0.15, the elastic resistances of B2O3 and Na2O become respectively maximal and minimal; (v) atx 2≈0.23, the elastic resistances of B2O3 and Na2O become respectively minimal and maximal; (vi) abovex 2=0.36, the elastic resistance of Na2O becomes negative.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02402945
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  • 4
    Electronic Resource
    Electronic Resource
    Ultrasonic velocity in sodium borate glasses (1991)
    Springer
    Journal of materials science 26 (1991), S. 4048-4053 
    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 Ultrasonic velocities in sodium borate glasses are measured as a function of composition at a frequency of 10 MHz and at a temperature of 298 K by making use of the ultrasonic pulse echo overlap method. Elastic properties of these glasses are analysed in terms of the elastic internal energy due to deformation; elastic resistances of the network-former, B2O3, and the modifier, Na2O, are obtained as a function of composition from the plot ofMV 2 againstx 2, whereM is the molar mass of sodium borate glasses,V the velocity of sound andx 2 the mole fraction of Na2O. The elastic resistances of B2O3 and Na2O are as follows: (i) forx 2〈0.33, the elastic resistance of B2O3 is smaller than that of Na2O; (ii) atx 2=0.33, the elastic resistances of B2O3 and Na2O are equal; (iii) forx 2〉0.33, the elastic resistance of B2O3 is greater than that of Na2O; (iv) atx 2≈0.15, the elastic resistances of B2O3 and Na2O become respectively maximal and minimal; (v) atx 2≈0.23, the elastic resistances of B2O3 and Na2O become respectively minimal and maximal; (vi) abovex 2=0.36, the elastic resistance of Na2O becomes negative.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553487
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  • 5
    Electronic Resource
    Electronic Resource
    Carbonization and graphitization of meso-carbon microbeads prepared by the emulsion method (1992)
    Springer
    Journal of materials science 27 (1992), S. 6079-6085 
    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 Meso-carbon microbeads (MCB) prepared from coal-tar and fluid catalytic cracking (FCC)-decant oil pitches by an emulsion method were carbonized and graphitized. When using the thermosetting process as a pretreatment, the weight gain of MCB by oxidation was approximately 5 wt%, and Fourier transform-infrared measurement showed that the oxidation occurred mainly at aliphatic components in MCB. In the course of carbonization, a heat treatment at 700°C eliminated the C-H groups and the oxygen-containing functional groups, which had remained partly at 500°C. MCB were fairly graphitizable, considering the high values of $$L_{c^{(o o 2)} } $$ obtained from X-ray diffraction measurement. The surface of MCB, which had been originally smooth, became slightly irregular during carbonization, and deformation in the shape of MCB was observed after the graphitization process. These are due to the anisotropic growth and shrinkage of the mesophase structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01133753
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  • 6
    Electronic Resource
    Electronic Resource
    Ultrasonic velocity in caesium borate glasses (1992)
    Springer
    Journal of materials science 11 (1992), S. 1406-1407 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00729642
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  • 7
    Electronic Resource
    Electronic Resource
    Influence of fibril length upon ePTFE graft healing and host modification of the implant (1992)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 26 (1992), S. 1433-1447 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Influence of fibril length (porosity) upon synthetic vascular graft healing has not been investigated in detail. The purpose of this study was to determine the dependence of neoendothelial healing, cellular response, and biocompatibility on the fibril length of expanded polytetrafluoroethylene (ePTFE) grafts with an internal diameter of 1.5 mm. ePTFE grafts of different fibril length, 20, 40, 60, and 90 μm, were implanted into the abdominal aorta of rats (n = 5 for each group). After 5 weeks, the implants were harvested and examined for neointimal and pseudointimal coverage by light microscopy and SEM. The hydroxyproline content of the implants was measured, and the distribution of collagen types was examined. The neointimal and pseudointimal coverage was related to the fibril length, and the neoendothelial healing was better on 60-μm and 90-μm grafts than on 20-μm and 40-μm grafts, The amount of hydroxyproline was also related to the fibril length, however, no significant difference could be observed between 60-μm and 90-μm grafts. Collagen types I and III were almost identically located in the middle portion of the implants. Our results demonstrate that the fibril length of ePTFE grafts affected neoendothelial healing and its affinity to collagen. © 1992 John Wiley & Sons, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820261104
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  • 8
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    Structural and transport properties of detwinned crystals of La2−xSrxCuO4 (1994)
    Elsevier
    Details
    Publication Date: 1994-12-01
    Print ISSN: 0921-4534
    Electronic ISSN: 1873-2143
    Topics: Physics
    Published by Elsevier
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  • 9
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    Effects of neutron irradiation on corrosion and segregation behavior in austenitic stainless steels (1991)
    Elsevier
    Details
    Publication Date: 1991-03-01
    Print ISSN: 0022-3115
    Electronic ISSN: 1873-4820
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Published by Elsevier
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  • 10
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    Effects of hydrogen on mechanical properties in irradiated austenitic stainless steels (1994)
    Elsevier
    Details
    Publication Date: 1994-09-01
    Print ISSN: 0022-3115
    Electronic ISSN: 1873-4820
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Published by Elsevier
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