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B. Elidrissi M. Addou M. Regragui A. Mzerd A. Bougrine A. Kachouane 《Solid State Ionics》2001,140(3-4):369-374
It was demonstrated that spray pyrolysis can be used to prepare Ce1−xZrxO2 thin films with x between 0 and 1. The composition of these films was determined by electron probe microanalysis (EPMA), and the crystalline structure by X-ray diffraction (XRD) and Raman spectroscopy (RS). Cyclic voltammetry (CV) was performed in an electrolyte of propylene carbonate with 1 M LiClO4. Films with high Zr content were incapable of charge exchange of Li+ ions. In the contrast, films with high Ce content were found to be able to insert/extract large charge densities of Li+ ions. They also remained transparent during Li+ intercalation. 相似文献
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Mohamed El Fatini Aziz Laaribi Roger Pettersson Regragui Taki 《Stochastics An International Journal of Probability and Stochastic Processes》2019,91(7):998-1019
ABSTRACTThis work is devoted to study the existence and uniqueness of global positive solution for a stochastic epidemic model with media coverage driven by Lévy noise. We also investigate the dynamic properties of the solution around both disease-free and endemic equilibria points of the deterministic model. Numerical simulations are presented to confirm the theoretical results. 相似文献
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Urban transportation with multiple roundabouts is facing significant challenges such as traffic congestion, gridlock and traffic accidents. In order to understand these behaviors, we propose a two-dimensional cellular automata (CA) model, where all streets are two-way, with one lane in each direction. To allow the turning movement, a roundabout is designed for each intersection where four roads meet. The distance between each pair of roundabouts is configured with the parameter K while the turning behavior of drivers is modeled by a parameter γ. To study the impact of these different parameters on the urban traffic, several traffic metrics are considered such as traffic flow, average velocity, accident probability and waiting time at the entrance of roundabout. Our simulation results show that the urban traffic is in free flow state when the vehicle’s density is low enough. However, when the density exceeds a critical density ρc, the urban traffic will be in gridlock state whenever γ is nonzero. In the case where the urban traffic presents a phase transition between free flow and congested state. Furthermore, detailed analysis of the traffic metrics shows that the model parameters (γ, K) have a significant effects on urban traffic dynamics. 相似文献
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A new technique called indexed composite filters (ICFs) for multiple object pattern recognition is proposed. Contrary to the
usual so-called composite filters, the proposed ICF offers the possibility to identify which object of the learning class
is detected at the output. The major advantage of ICF is that the output gives for every object detected two correlation peaks
encoding the position and identity of the detected object. Computer simulation results are given using alphabetic input scenes
that illustrates the efficiency of the proposed method. 相似文献
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F. Sbai R. Regragui E. Essassi A. Kenz M. Pierrot 《Acta Crystallographica. Section C, Structural Chemistry》2003,59(8):m334-m336
The structures of dichloro{2‐[(5‐methyl‐1H‐pyrazol‐3‐yl‐κN2)methyl]‐1H‐1,3‐benzimidazole‐κN3}copper(II), [CuCl2(C12H12N4)], and di‐μ‐chloro‐bis(chloro{2‐[(5‐methyl‐1H‐pyrazol‐3‐yl‐κN2)methyl]‐1H‐1,3‐benzimidazole‐κN3}cadmium(II)), [Cd2Cl4(C12H12N4)2], show that these compounds have the structural formula [ML(Cl)2]n, where L is 2‐[(5‐methylpyrazolyl)methyl]benzimidazole. When M is copper, the complex is a monomer (n = 1), with a tetrahedral coordination for the Cu atom. When M is cadmium (n = 2), the complex lies about an inversion centre giving rise to a centrosymmetric dimer in which the Cd atoms are bridged by two chloride ions and are pentacoordinated. 相似文献
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