Study of double perovskite La2B(II)MnO6 (B: Ni,Co, Cu) as electrode materials for energy storage

Journal of Solid State Electrochemistry - In this paper, the study of the potential capacity of energy storage in supercapacitors containing oxide La2B(II)MnO6 (with B = Cu, Co, Ni) as...     

Phase transition in multicomponent systems

Phase transition in a system of several components is studied including chemical reactions by means of an approach based on non-equilibrium thermodynamics. A non-linear constitutive relation with discontinuities across the interphase is considered. Existence of at least one weak solution is proved, using an a priori estimate based on the second principle of thermodynamics. The above formulation is compared with Fourier's and Fick's equations and transformation formulas are given.     

General free boundary evolution problems in several space dimensions

Existence results are given for the weak formulation of two-phase free boundary evolution problems, with free boundary jump conditions generalizing that of Stefan and with possibly vanishing coefficient of time derivative.     

Models of hysteresis

The concept ofhysteresis operator is introduced. Existence of a solution is proven for a parabolic differential equation containing a hysteresis operator. A collection of references of mathematical papers on hysteresis is also provided.     

Effect of co-precipitation and solid-state reaction synthesis methods on lithium-rich cathodes Li1.2Ni0.2Mn0.6O2

Journal of Solid State Electrochemistry - Lithium-rich oxides (Li1.2Ni0.2Mn0.6O2) were obtained by two synthesis routes: co-precipitation method and solid-state reaction. Both materials showed a...     

Scale-Transformations in the Homogenization of Nonlinear Magnetic Processes

A class of nonlinear first-order processes is formulated as a minimization principle. In the presence of oscillating data, a two-scale model is then derived, via Nguetseng’s notion of two-scale convergence. The dependence on the fine-scale variable is eliminated by averaging with respect to the fine-scale (scale-integration or upscaling); conversely, any two-scale solution is retrieved from a coarse-scale one (scale-disintegration or downscaling). These results are first developed in a general functional framework, and are then applied to the homogenization of a relaxation dynamics in magnetic composites: $ \mathcal{A}(x/\varepsilon) {\partial B_\varepsilon\over \partial t} + \alpha(B_\varepsilon, x/\varepsilon) \ni H_\varepsilon $ $ \nabla \cdot B_\varepsilon=0, \quad \nabla \times H_\varepsilon =J(x) \quad \forall\;\varepsilon > 0. $ Here J is a prescribed current density. ${\mathcal{A}(y)}A class of nonlinear first-order processes is formulated as a minimization principle. In the presence of oscillating data, a two-scale model is then derived, via Nguetseng’s notion of two-scale convergence. The dependence on the fine-scale variable is eliminated by averaging with respect to the fine-scale (scale-integration or upscaling); conversely, any two-scale solution is retrieved from a coarse-scale one (scale-disintegration or downscaling). These results are first developed in a general functional framework, and are then applied to the homogenization of a relaxation dynamics in magnetic composites:

A(x/e) [(?Be)/(?t)] + a(Be, x/e) ' He \mathcal{A}(x/\varepsilon) {\partial B_\varepsilon\over \partial t} + \alpha(B_\varepsilon, x/\varepsilon) \ni H_\varepsilon      48. Ten Issues About Hysteresis      Augusto Visintin 《Acta Appl Math》2014,132(1):635-647 In this note some basic models of hysteresis are reviewed: the linear and generalized plays, the relay and the Preisach model. Some related questions are also illustrated.      49. On the effect of the carbonaceous substrate in the nucleation of Sn nanoparticles for Li-ion anodes: experiments and first principles calculations      Sacha Smrekar  Martin E. Zoloff Michoff  Jorge E. Thomas  Cecilia A. Calderón  Lucas M. Farigliano  Arnaldo Visintin  Ezequiel P. M. Leiva  Daniel E. Barraco 《Journal of Solid State Electrochemistry》2018,22(6):1721-1733 The nucleation of Sn nanoparticles by chemical reduction was studied using three different carbonaceous substrates, to obtain Sn/C composites. When used as active materials in anodes for lithium-ion batteries, these composites displayed higher capacities than commercially used graphite, and showed a good cyclability. The differences in morphology, capacity, cyclability, and diffusion between the resulting materials are highlighted. The resulting materials were characterized by charge-discharge cycling, voltammetry, EIS, SEM, and TEM microscopy. It was found that the substrate has a determinant effect on the deposition of Sn. This effect is interpreted in terms of the relative adsorption energies of a single Sn atom obtained from DFT calculations. Open image in new window Graphical abstract ?       50. Homogenization of nonlinear visco-elastic composites      Augusto Visintin 《Journal de Mathématiques Pures et Appliquées》2008,89(5):477-504       [首页] « 上一页 [1] [2] [3] [4] 5 [6] 下一页 » 末  页»

Ten Issues About Hysteresis

In this note some basic models of hysteresis are reviewed: the linear and generalized plays, the relay and the Preisach model. Some related questions are also illustrated.     

On the effect of the carbonaceous substrate in the nucleation of Sn nanoparticles for Li-ion anodes: experiments and first principles calculations

The nucleation of Sn nanoparticles by chemical reduction was studied using three different carbonaceous substrates, to obtain Sn/C composites. When used as active materials in anodes for lithium-ion batteries, these composites displayed higher capacities than commercially used graphite, and showed a good cyclability. The differences in morphology, capacity, cyclability, and diffusion between the resulting materials are highlighted. The resulting materials were characterized by charge-discharge cycling, voltammetry, EIS, SEM, and TEM microscopy. It was found that the substrate has a determinant effect on the deposition of Sn. This effect is interpreted in terms of the relative adsorption energies of a single Sn atom obtained from DFT calculations.

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Graphical abstract ?