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Qi J.,Chongqing University | Li C.,Chongqing University | Huang T.,Texas A & iversity at Qatar | Zhang W.,Chongqing University
Neural Processing Letters | Year: 2015

This paper aims to design an appropriate switching law to stabilize the switched neural networks with time-varying delays when all subsystems are unstable. By using the discretized Lyapunov function approach and the extended comparison principle for impulsive systems, the stability of switched delayed neural networks composed full of unstable subsystems is analyzed and a computable sufficient condition is derived in the framework of dwell time. The effectiveness of the proposed results is illustrated by a numerical example. © 2015 Springer Science+Business Media New York Source

Wen S.,Huazhong University of Science and Technology | Wen S.,Key Laboratory of Image Processing and Intelligent Control of Education Ministry of China | Zeng Z.,Huazhong University of Science and Technology | Zeng Z.,Key Laboratory of Image Processing and Intelligent Control of Education Ministry of China | Huang T.,Texas A & iversity at Qatar
Nonlinear Dynamics | Year: 2014

This paper investigates the synchronization problem of memristive systems with multiple networked input and output delays via observer-based control. A memristive system is set up, and the fuzzy method has been employed to linearize the dynamical system of the memristive system; the networked input and output delays are considered in the synchronization problem of this system. A truncated predictor feedback approach is employed to design the observers. Under certain restrictions, a class of finite-dimensional observer-based output feedback controllers is designed. A numerical example is carried out to demonstrate the effectiveness of the proposed methods. © 2014, Springer Science+Business Media Dordrecht. Source

Andric J.M.,Studentski trg | Misini-Ignjatovic M.Z.,University of Belgrade | Murray J.S.,University of New Orleans | Politzer P.,University of New Orleans | And 2 more authors.
ChemPhysChem | Year: 2016

The hydrogen bonding of noncoordinated water molecules to each other and to water molecules that are coordinated to metal-ion complexes has been investigated by means of a search of the Cambridge Structural Database (CSD) and through quantum chemical calculations. Tetrahedral and octahedral complexes that were both charged and neutral were studied. A general conclusion is that hydrogen bonds between noncoordinated water and coordinated water are much stronger than those between noncoordinated waters, whereas hydrogen bonds of water molecule in tetrahedral complexes are stronger than in octahedral complexes. We examined the possibility of correlating the computed interaction energies with the most positive electrostatic potentials on the interacting hydrogen atoms prior to interaction and obtained very good correlation. This study illustrates the fact that electrostatic potentials computed for ground-state molecules, prior to interaction, can provide considerable insight into the interactions. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Source

Koizumi H.,University of Tsukuba | Okazaki A.,University of Tsukuba | Ghantous M.A.,Texas A & iversity at Qatar | Tachiki M.,Tohoku University
Journal of Superconductivity and Novel Magnetism | Year: 2014

We propose a novel supercurrent generation mechanism in the cuprate. The supercurrent is generated as a collection of the spin-vortex-induced loop currents created with the doped holes at their centers. A quartet of the spin-vortices with width 4a (a is the lattice constant of the CuO2 plane) is the stable unit of the spin-vortices, and an assembly of them creates a network channel for the supercurrent flow. A macroscopic supercurrent flows when they cover the whole CuO2 plane. The Ginzburg-Landau macroscopic wave function formalism is also derived from the present supercurrent generation mechanism. © 2014, Springer Science+Business Media New York. Source

Wang X.,Southwest University | Wang H.,Chongqing Normal University | Li C.,Southwest University | Huang T.,Texas A & iversity at Qatar
Nonlinear Dynamics | Year: 2016

Synchronization of coupled delayed switched neural networks (DSNNs) with impulsive time window is one of the most challenging problems in the field of complex networks. In this paper, some sufficient conditions ensuring the synchronization of coupled DSNNs with all subsystems self-synchronizing are presented. Then this results are extended to the following two cases: all subsystems are desynchronizing and some of subsystems are self-synchronizing. By applying switching Lyapunov function method, some general criteria which characterize the impulse and switching effects in aggregated form are given. Moreover, from our results, one can easily observes that the impulsive time window control strategy is more general and more applicable than the fixed impulses controllers. Finally, numerical simulations are presented to further demonstrate the effectiveness of the proposed results. © 2016 Springer Science+Business Media Dordrecht Source

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