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  • 1
    Electronic Resource
    Electronic Resource
    Competition between ferromagnetic metallic and paramagnetic insulating phases in manganites (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 92 (2002), S. 1406-1410 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: La0.67Ca0.33Mn1−xCuxO3 (x=0 and 0.15) epitaxial thin films were grown on the (100) LaAlO3 substrates, and the temperature dependence of their resistivity was measured in magnetic fields up to 12 T by a four-probe technique. We found that the competition between the ferromagnetic metallic (FM) and paramagnetic insulating (PI) phases plays an important role in the observed colossal magnetoresistance (CMR) effect. Based on a scenario that the doped manganites approximately consist of phase-separated FM and PI regions, a simple phenomenological model was proposed to describe the CMR effect. Using this model, we calculated the resistivity as functions of temperature and magnetic field. The model not only qualitatively accounts for some main features related to the CMR effect, but also quantitatively agrees with the experimental observations. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1490153
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  • 2
    Electronic Resource
    Electronic Resource
    Pr-doping effect on the depinning of vortices in Bi2Sr2Ca1−xPrxCu2Oy single crystals (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5567-5569 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The irreversibility lines of Pr-doped Br2Sr2Ca1−xPrxCu2Oy single crystals have been studied systematically. It was found that for the Pr-doped samples as compared with the undoped Bi2Sr2CaCu2Oy the effective superconducting area shrinks, the irreversibility line Birr decreases, and the anisotropic parameter γ increases strongly due to Pr doping. It is evident that the substitution of Pr for Ca in the system effectively reduces the hole concentration on CuO2 layers to the underdoped state and destroys the Josephson coupling of the two superconducting regions of adjacent CuO2 layers. The vortex depinning is responsible for the irreversibility and the displacement value for vortex depinning is similar to that for vortex lattice melting, but with different physical meaning. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373406
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  • 3
    Electronic Resource
    Electronic Resource
    Doping dependence of the Josephson coupling in Bi2Sr2Ca1−xGdxCu2O8+δ single crystals (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 3088-3090 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Gd and oxygen doping effects on the Josephson coupling in Bi2Sr2Ca1−xGdxCu2O8+δ single crystals have been studied systematically. It was found that a pseudo-transition at temperature TcJ, attributed to the Josephson coupling between CuO2 layers, shifts dramatically to lower temperature with increasing magnetic field, and the temperature dependence of the pseudo-upper-critical-field HcJ associated with the coupling shows a clear upward curvature. For the Gd-doped as compared with the oxygen-doped crystal, the value of TcJ is smaller at the same carrier density, which implies that the substitution of Gd for Ca reduces the Josephson coupling more severely. The characteristics of the pseudo-transition associated with the Josephson coupling between CuO2 layers are different from those of the superconducting transition occurring in the CuO2 layers. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.126532
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  • 4
    Electronic Resource
    Electronic Resource
    Hematoporphyrin derivative photosensitization and cellular fluorescent photoproduct formation
    Amsterdam : Elsevier
    Journal of Photochemistry and Photobiology B: Biology 2 (1988), S. 503-513 
    Details
    ISSN: 1011-1344
    Keywords: Hematoporphyrin derivative ; hyperthermia. ; photoproduct ; photosensitization
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/1011-1344(88)85079-6
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  • 5
    Electronic Resource
    Electronic Resource
    Diethoxybis(4,4,4-trifluoro-1-phenyl-1,3-butanedionato)titanium(IV) (1990)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 46 (1990), S. 1633-1635 
    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/S0108270189013909
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  • 6
    Electronic Resource
    Electronic Resource
    Representation of plasticity at an interface crack by inclined strip yield superdislocation model (1994)
    Springer
    Acta mechanica solida Sinica 7 (1994), S. 265-273 
    Details
    ISSN: 0894-9166
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The basic equations of the representation of plasticity at an interface crack by an inclined strip yield superdislocation model are derived. With a special combination of the material properties and small-scale yielding case, the problem is reduced to an algebraic equation in an unknown, the ratio of the plastic zone size. Some discussions on the limitations of this model are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02208371
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  • 7
    Electronic Resource
    Electronic Resource
    Structure and electrical characteristics of ICBD C60 films (1996)
    Springer
    Applied physics 63 (1996), S. 353-357 
    Details
    ISSN: 1432-0630
    Keywords: 61.46.+W ; 68.55.Jk ; 73.40.Lq
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Polycrystalline C60 films are deposited onto a variety of substrates by ionized cluster beam deposition (ICBD) technique. The structure of the ICBD C60 films are studied by transmission electron microscopy (TEM). The electrical characteristics of the ICBD C60 films on silicon substrates are investigated by current-voltage (I–V) measurements. TheICBD C60/p-Si and C60/n-Si heterostructures show strong current rectification, which is analyzed using band theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01567326
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  • 8
    Electronic Resource
    Electronic Resource
    Structure and electrical characteristics of ICBD C60 films (1996)
    Springer
    Applied physics 63 (1996), S. 353-357 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 61.46.+W ; 68.55.Jk ; 73.40.Lq
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  Polycrystalline C60 films are deposited onto a variety of substrates by ionized cluster beam deposition (ICBD) technique. The structure of the ICBD C60 films are studied by transmission electron microscopy (TEM). The electrical characteristics of the ICBD C60 films on silicon substrates are investigated by current–voltage (I–V) measurements. The ICBD C60/p-Si and C60/n-Si heterostructures show strong current rectification, which is analyzed using band theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050398
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  • 9
    Electronic Resource
    Electronic Resource
    Lubrication approximation in completed double layer boundary element method (2000)
    Springer
    Computational mechanics 26 (2000), S. 388-397 
    Details
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper reports on the results of the numerical simulation of the motion of solid spherical particles in shear Stokes flows. Using the completed double layer boundary element method (CDLBEM) via distributed computing under Parallel Virtual Machine (PVM), the effective viscosity of suspension has been calculated for a finite number of spheres in a cubic array, or in a random configuration. In the simulation presented here, the short range interactions via lubrication forces are also taken into account, via the range completer in the formulation, whenever the gap between two neighbouring particles is closer than a critical gap. The results for particles in a simple cubic array agree with the results of Nunan and Keller (1984) and Stoksian Dynamics of Brady et al. (1988). To evaluate the lubrication forces between particles in a random configuration, a critical gap of 0.2 of particle's radius is suggested and the results are tested against the experimental data of Thomas (1965) and empirical equation of Krieger-Dougherty (Krieger, 1972). Finally, the quasi-steady trajectories are obtained for time-varying configuration of 125 particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004660000188
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  • 10
    Electronic Resource
    Electronic Resource
    Traction-based Completed Adjoint Double Layer Boundary Element Method in elasticity (1995)
    Springer
    Computational mechanics 16 (1995), S. 360-367 
    Details
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper is concerned with a traction-based Completed Adjoint Double Layer Boundary Element Method to solve for the surface traction of a system of rigid particles embedded in an elastic matrix. The main feature of the method is a single layer representation of the displacement field, which leads to a system of second-kind integral equations for the traction field, the extreme eigenvalue of which could be deflated, allowing iterative solution strategies to be effectively applied. The method is therefore most suitable for large-scale simulations of particulate solids. The method is benchmarked against some known analytic solutions, including the difficult stress singularity problems at sharp edges. The effectiveness of the method in dealing with a large number of inclusions is also demonstrated with an elongational deformation problem involving up to 25 inclusions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00350724
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