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Superfluid density in the underdoped YBa2Cu3O7-x: evidence for d-density-wave order of the pseudogap
The investigation of the penetration depth lambda(ab)(T,p) in YBa2Cu3O7-x crystals allowed one to observe the following features of the superfluid density n(s)(T,p) proportional, variant lambda(-2)(ab)(T,p) as a function of temperature T0) depends on p slightly in the optimally and moderately doped regions (0.10
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Márcio AF Belo-Filho Franklina MB Toledo Bernardo Almada-Lobo 《The Journal of the Operational Research Society》2014,65(11):1735-1747
Setup operations are significant in some production environments. It is mandatory that their production plans consider some features, as setup state conservation across periods through setup carryover and crossover. The modelling of setup crossover allows more flexible decisions and is essential for problems with long setup times. This paper proposes two models for the capacitated lot-sizing problem with backlogging and setup carryover and crossover. The first is in line with other models from the literature, whereas the second considers a disaggregated setup variable, which tracks the starting and completion times of the setup operation. This innovative approach permits a more compact formulation. Computational results show that the proposed models have outperformed other state-of-the-art formulation. 相似文献
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Stability and convergence of the spectral Lagrange-Galerkin method for mixed periodic/non-periodic convection-dominated diffusion problems 总被引:1,自引:0,他引:1
We present a convergence analysis of the spectral Lagrange-Galerkinmethod for mixed periodic/non-periodic convection-diffusionproblems. The scheme is unconditionally stable, independentof the diffusion coefficient, even in the case when numericalquadrature is used. The theoretical predictions are illustratedby a series of numerical experiments. For the periodic case,our results present a significant improvement on those givenby Süli & Ware (1991) SIAM J. Numer.Anal.28, 423-445). 相似文献
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L. A. Klinkova V. I. Nikolaichik N. V. Barkovskii V. K. Fedotov A. F. Shevchun 《Russian Journal of Inorganic Chemistry》2014,59(3):224-231
Mass transfer during the electrolysis of melts of Y0.02Ba0.30Cu0.70O y and Y0.02Ba0.25Cu0.75O y samples was studied at 950°C (for 0.5 h) and currents of 5–1050 mA. YBa2Cu3O6 + δ (123) tetragonal oxide crystal boules were grown, and their cationic composition and structure were studied by X-ray powder diffraction and by electron diffraction and elemental analysis in a transmission electron microscope (ED/TEM and EA/TEM). The 123 oxide was found to have cationic off-stoichiometry and to have a domain structure with domain sizes of 20–50 Å. Magnetic susceptibility versus temperature curves measured in the crystals after oxygen annealing (450°C, 1 h) feature four kinks, which indicate the occurrence of four superconducting phases with T c = 45, 52, 75, and 86 K. Electrolysis byproducts are platinum-containing oxides Ba9Pt4Cu3O y and Ba50Pt15Y16Al13Cu7O y unknown hitherto; we report structure data for them. 相似文献
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A. A. Golubov O. V. Dolgov A. V. Boris A. Charnukha D. L. Sun C. T. Lin A. F. Shevchun A. V. Korobenko M. R. Trunin V. N. Zverev 《JETP Letters》2011,94(4):333-337
The normal state resistivity in multiband superconductors has been analyzed in the framework of Eliashberg theory. The results
are compared with measurements of the temperature dependence of normal state resistivity of high-purity Ba0.68K0.32Fe2As2 single crystals with the highest reported transition temperature T
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= 38.5 K. The experimental data demonstrate strong deviations from the Bloch-Grüneisen behavior, namely the tendency to saturation
of the resistivity at high temperatures. The observed behavior of the resistivity is explained within the two band scenario
when the first band is strongly coupled and relatively clean, while the second band is weakly coupled and is characterized
by much stronger impurity scattering. 相似文献
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