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  • 1
    Electronic Resource
    Electronic Resource
    Schematic frictional model for interacting vortices in an isotropic superconducting plate (abstract) : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6965-6965 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In the simple model proposed, repulsive intervortex forces are balanced by containing forces produced by the external field (H) and by frictional forces representing the effects of pinning on displaced vortices. For the field-cooled (FC) state, whose vortex density is presumably uniform, the empirical fact that the average flux density (B¯) in nearly equal to H yields an operational inverse-square dependence of the intervortex force on the intervortex spacing. For both the FC and zero-field-cooled (ZFC) states, expressions are derived for B¯ vs H (including the remanences at H=0) and for the profiles of B across the sample thickness. Calculations of these properties are compared with experiment and with the macroscopically related critical-state model, revealing again that the pinning forces are strongly dependent on H. The frictional interacting-vortex model is also used in deriving the critical current as a transport property of the FC and ZFC states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358058
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  • 2
    Electronic Resource
    Electronic Resource
    Vortex flux creep and magnetic hysteresis in a type-II superconductor (abstract) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6343-6343 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Upon reversal of the external magnetic field H during any hysteretic cycling of a type-II superconductor in its vortex state, the rate at which the magnetic flux density B varies with H is typically seen to start from zero and then change gradually. Measurements have now been made of the time dependence of B (the vortex flux creep) at many fixed-H points on several hysteresis loops of a grain-oriented YBa2Cu3O7 sample at 4.2 K (with H and B along the c axis), and it is observed that the size of the logarithmic dB/dt drops abruptly to zero, before proceeding to change in sign, whenever H is reversed. This curious similarity between the hysteretic behavior of dB/dt at fixed H and that of the nearly instantaneously measured dB/dH can be understood qualitatively in terms of the vortex pinning. As rotational magnetization measurements have recently shown,1 the unpinning and repinning of moving vortices is manifested macroscopically as a frictional process. Thus, the reversal of vortex motion involves the reversal of frictional forces, during which the vortex population in the superconducting sample (which is proportional to B) does not change with time or field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355394
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  • 3
    Electronic Resource
    Electronic Resource
    Further studies on Pseudomonas aeruginosa LasA: analysis of specificity (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 6 (1992), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Full elastolytic activity in Pseudomonas aeruginosa is a result of the combined activities of elastase, alkaline proteinase, and the lasA gene product, LasA. The results of this study demonstrate that an active fragment of the LasA protein which is isolated from the culture supernatant fraction is capable of degrading elastin in the absence of elastase, thus showing that LasA is a second elastase produced by this organism. In addition, it is shown that LasA-mediated enhancement of elastotysis results from the separate activities of LasA and elastase upon elastin. The LasA protein does not affect the secretion or activation of a proelastase as previously proposed in other studies. Furthermore, LasA has specific proteolytic capability, as demonstrated by its ability to cleave β-casein. Preliminary analysis of β-casein cleavage in the presence of various protease inhibitors suggests that LasA may be classified as a modified serine protease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2958.1992.tb01554.x
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  • 4
    Electronic Resource
    Electronic Resource
    Preparation of ferroelectric BaTiO3 thin films by metal organic chemical vapour deposition (1990)
    Springer
    Journal of materials science 1 (1990), S. 219-224 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Polycrystalline BaTiO3 thin films have been successfully prepared on (100) silicon substrates at temperatures under 600° C by metal organic chemical vapour deposition using barium acetylacetonate and diisopropoxy-titanium-bis-(acetylacetonate). To vaporize the barium acetylacetonate, which is nonvolatile under 300° C and thermally unstable, an ultrasonic spraying technique was used. The substrate temperature had a great influence on the structure and composition of films and the single-phase BaTiO3 films could be prepared at 500° C. At temperatures above 550° C the reaction between the film and the silicon substrate occurred to a large extent. The polarization-electric field (P-E) hysteresis loops and counter-clockwise direction of hysteresis in the high-frequency (1 MHz)C-V characteristics indicate that the BaTiO3 films deposited on silicon using the present method are ferroelectric.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00696081
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of V2O5 on the electrical properties of TiO2-V2O5 humidity sensors (1994)
    Springer
    Journal of materials science 5 (1994), S. 300-304 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract TiO2-V2O5 ceramic humidity sensors were prepared and measured to obtain the relationships between the added amount of V2O5 and the properties of the sensor elements, such as total pore volume, bulk impedance and the humidity-sensitive property in the low relative humidity region. It was observed that both the microstructure and the bulk impedance of the sensor element were strongly dependent on the added amount of V2O5. The equivalent circuit of the specimen was postulated for analysis and the sensor characteristics in low and high humidity regions are discussed. The samples which contained higher amounts of V2O5 seemed to be more strongly hygroscopic in low humidities, whereas the samples that had higher pore volumes contained water much more at high humidities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00921256
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  • 6
    Electronic Resource
    Electronic Resource
    Scanning tunnelling microscopy study of activated carbon fibres (1993)
    Springer
    Journal of materials science 28 (1993), S. 2950-2954 
    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 Scanning tunnelling microscopy (STM) has been used to study isotropic pitch-based carbon fibres before and after steam activation. The results show that the present carbon fibre precursor exhibits a particulate surface which is very favourable for the formation of activated carbon fibre. After activation, the carbon fibre surface becomes much more porous and rougher, and the mesopores are evidently present on the surface. Because the scale is down to atomic resolution, the STM observations offer direct evidence for the existence of micropores on the surface of the activated carbon fibres. In addition, the surface textures of both fibres are presented and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00354698
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  • 7
    Electronic Resource
    Electronic Resource
    Reduced water degradation of YBaCuO by Si3N4 protective coating (1990)
    Springer
    Journal of materials science 9 (1990), S. 967-969 
    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/BF00722190
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  • 8
    Electronic Resource
    Electronic Resource
    Effects of cation distribution on magnetic properties in cobalt ferrite (1993)
    Springer
    Journal of materials science 12 (1993), S. 961-962 
    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/BF00455632
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  • 9
    Electronic Resource
    Electronic Resource
    Mössbauer study on the distribution change and charge conversion of cations in CoFe2O4 (1993)
    Springer
    Journal of materials science 12 (1993), S. 361-362 
    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/BF00609154
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  • 10
    Electronic Resource
    Electronic Resource
    Ethyl-methane sulphonate (EMS) induced nodulation mutants of common bean (Phaseolus vulgaris L.) lacking effective nodules (1992)
    Springer
    Plant and soil 139 (1992), S. 295-298 
    Details
    ISSN: 1573-5036
    Keywords: dry bean ; N2 fixation ; nodulation mutants ; Rhizobium leguminosarum bv. phaseoli
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Seed of white bean (Phaseolus vulgaris L. cv. OAC Rico) was treated with 0.04 M ethyl-methane sulphonate. Screening of the M2 progeny from 175 M1 lines in the presence of 1 mM nitrate revealed two nodulation mutants. One line was essentially non-nodulating in several tests, but small white nodules were observed occasionally in other tests with 16 separate Rhizobium strains. The other line formed tiny, creamy white, non-functional (ineffective) and tumor-like pseudo-nodules. The M3 and M4 progenies were fertile and bred true.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00009321
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