نتایج جستجو برای: type ii superconductor
تعداد نتایج: 1804817 فیلتر نتایج به سال:
abstract background and objective: osteoporosis is one of the complications of diabetes. the aim of this study was to determine the impact of resistance training along with portulaca oleracea supplementation on opg and nfκb levels (bone markers) in women with type ii diabetes. methods: overall, 28 women with type ii diabetes (44 to 60 years old) were randomly and equally assigned ...
background: type ii diabetes is known as one of the most important, prevalent, and expensive diseases of mankind. late diagnosis and subsequent delayed initiation of treatment or surveillance of patients create a variety of problems for affected individuals. this has raised increasing concerns for public health authorities throughout the world. in the current study, we aimed to find a new appro...
The temperature dependence of ac susceptibility of (Bi-Pb)2223 polycrystalline samples was measured as a function of frequency and ac field amplitude. Analysis of the temperature dependence of the AC susceptibility near the transition temperature (Tc) has been done employing Bean’s critical state model. The observed variation of intergranular critical current densities (Jc) with temperature i...
A team of researchers with members from several countries in Europe has used a type of X-ray diffraction to reveal defects in the way a superconductor develops. In their paper published in the journal Nature, the team describes the technique they used to study one type of superconductor and what they saw. Erica Carlson with Perdue University offers a News & Views piece on the work done by the t...
We study properties of Abrikosov-Nielsen-Olesen (ANO) strings with the Coleman-Weinberg (CW) potential, which we call CW-ANO strings. While scale-invariant scalar potential has a topologically trivial vacuum admitting no at classical level, quantum correction allows nontrivial vacua and stable string solutions. find that system CW exhibits significant difference from conventional Abelian-Higgs ...
We use Josephson plasma resonance (JPR) and DC torque magnetization measurements to investigate the vortex structure and dynamics in the layered organic superconductor -(ET) Cu(NCS) . JPR studies probe the AC response of this extreme type-II superconductor for currents driven along the low conductivity axis. An observed crossover in the magnetic "eld and temperature dependence of the JPR freque...
The superheating magnetic field of a type II superconductor is examined, using the time-dependent Ginzburg-Landau equations and the methods of formal asymptotics. The supercon-ducting solution in a halfspace is found to exist only for magnetic fields lower than some critical value where there is a folding over of the solution branch. A linear stability analysis is performed both in one and two ...
We investigate flux front penetration in a disordered type-II superconductor by molecular dynamics simulations of interacting vortices and find scaling laws for the front position and the density profile. The scaling can be understood by performing a coarse graining of the system and writing a disordered nonlinear diffusion equation. Integrating numerically the equation, we observe a crossover ...
This paper is concerned with a model describing the distribution of vortices in a Type-II superconductor. These vortices are distributed continuously and occupy an unknown region D with ∂ D representing the free boundary. The problem is set as follows: two constants H0 > H1 > 0 are given, to find an open subset D of the smooth bounded open set Ω ⊂ R2 and a function H defined on Ω\D such that: ...
The recent discovery that some of the coefficients of the viscosity tensor are negative is shown to invalidate the hydrodynamic approach to the vortex liquid phase of a type-II superconductor. A satisfactory theory requires retention of all the spatial gradients of the velocities or electric fields and not just the first derivatives, as assumed in a hydrodynamic theory. We illustrate such a pro...
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