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Modelling of sediment movement in the surf and swash zones

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Acta Oceanologica Sinica 2015年第2期34卷 137-142页

作者： TOKPOHOZIN N.B. KOUNOUHEWA B. AVOSSEVOU G.Y.H. HOUEKPOHEHAM A. AWANOU C.N. Institut de mathématiques et de Sciences Physiques (IMSP/UAC) Centre Béninois de la Recherche Scientifique et Technique (CBRST) laboratoire de Physique du Rayonnement (lPR/FAST-UAC)

Under the action of marine currents,non-cohesive sediments evolve by bed-load,by saltation or suspension depending on their *** authors have considered that the movement of sediment is bidimensional and modelized the effects of swell by a constant velocitynear the *** we have studied the velocity profile of fluctuating currents near the seabed and studied the movement of sediment in *** results show that in the areas of study（surf and swash）the movement of sediment occurs in a volume,and the evolution of sediment varies from an areato *** obtained theoretical profiles of the position and velocity vectors confirm the observations of several authors.

关键词： non-cohesive sediments sediment dynamics swell trajectory of sediment velocity drive

Periodic Solutions of Evolution Variational Inequalities—a Method of Guiding Functions

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Chinese Annals of mathematics,Series B 2009年第3期30卷 261-272页

作者： Samir ADlY Daniel GOElEVEN Michel THRA Département de math'ematiques et Informatique Laboratoire XLIM(Unité Mixte 6172 du CNRS)Université de Limoges123 Avenue A.Thomas87060 Limoges CedexFrance. laboratoire d' Informatique et de mathématiques Université de La Réunion97400 Saint-DenisFrance.

This paper focuses on a part of the presentation given by the third author at the Shanghai Forum on Industrial and Applied mathematics(Shanghai 2006).It is related to the existence of a periodic solution of evolution ... 详细信息

关键词： Variational inequality Differential inclusion Topological degree Guiding function Periodic solution

A survey of the Szeg? equation dedicated to Professor Jean-Yves Chemin on the Occasion of His 60th Birthday

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Science China mathematics 2019年第6期62卷 1087-1100页

作者： Patrick Gérard Sandrine Grellier laboratoire de mathématiques d'Orsay Université Paris-Sud CNRSUniversité Paris-Saclay Institut denis Poisson-Université d'Orléans/Université de Tours CNRS UMR

We survey the main properties of the cubic Szeg? equation from the Pde viewpoint, emphasising global existence of smooth solutions, analytic regularity, growth of high Sobolev norms and the effects of weak damping.

关键词： cubic Szego equation integrable system Hankel operator spectral analysis analytic regularity wave turbulence

ANAlYTICAl SMOOTHing EFFECT OF SOlUTION FOR THE BOUSSINESQ EQUATIONS

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Acta mathematica Scientia 2019年第1期39卷 165-179页

作者： Feng CHENG Chao jiang XU Hubei Key laboratory of Applied mathematics School of mathematics and Statistics Hubei University School of mathematics and Statistics Wuhan University Universite de Rouen CNRS UMR 6085 Laboratoire de Mathématiques

In this article, we study the analytical smoothing effect of Cauchy problem for the incompressible Boussinesq equations. Precisely, we use the Fourier method to prove that the Sobolev H^1 -solution to the incompressible Boussinesq equations in periodic domain is analytic for any positive time. So the incompressible Boussinesq equations admit exactly same smoothing effect properties of incompressible Navier-Stokes equations.

关键词： analyticity smoothing effect of solutions Boussinesq equation

ON SOlVABIlITY OF A BOUNDARY VAlUE PROBlEM FOR THE POISSON EQUATION WITH A NONlOCAl BOUNDARY OPERATOR

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Acta mathematica Scientia 2015年第5期35卷 970-980页

作者： B.J.KADIRKUlOV M.KIRANE Tashkent State Institute for Oriental Studies laboratoire de mathématiques Image et Applications Université de La Rochelle NAAM Research Group Department of Mathematics Faculty of ScienceKing Abdulaziz University

In this work, we investigate the solvability of the boundary value problem for the Poisson equation, involving a generalized Riemann-liouville and the Caputo derivative of fractional order in the class of smooth functions. The considered problems are generalization of the known Dirichlet and Neumann oroblems with operators of a fractional order.

关键词： operator of fractional integration and differentiation solvability boundary value problem Riemann-liouville operator Caputo fractional derivative Poisson equation Dirichlet and Neumann problems

Crystal Structure of BaxSr1-xTiO3Fine Powder

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Journal of Modern Physics 2015年第1期6卷 70-77页

作者： Natheer B. Mahmood Emad K. Al-Shakarchi Brahim Elouadi Xavier Feaugas Physics department College of Science Al-Nahrain University Baghdad Iraq laboratoire des Sciences de l’ingénieur pour l’Environnement Université de La Rochelle La Rochelle France

Various compositions of the system BaxSr1-xTiO3 (BST) have been elaborated both as fine powders and ceramic monoliths, using the co-precipitation route within a warmed supersaturated solution of oxalic acid. The appropriate stoichiometry was determined from the mixtures of precisely titrated aqueous solutions of cations chlorides (SrCl2, BaCl2, and TiCl4). The reason of this process was to apply low sintering temperature in production of BST samples with ultra-fine powders. These powders primarily calcined at (850°C) for (5 hr) were used to elaborate ceramics after pellets sintering at (1200°C) during (8 hrs). Indeed, XRD patterns were confirmed that the samples are a pure phase and a perovskite cubic structural type at (x = 0, 0.5, 0.6). Whereas, (x = 0.7, 0.8, 0.9, 1) showed a tetragonal phase. There is agreement between the FTIR and XRD analysis, by the relation of the wave vector (K) and lattice constant. It was deduced a stimulated relation between (x) and (K). The results of TEM, they were clear that the lowest particle sizes investigated of BST powders nearly (36 - 50 nm).

关键词： Barium Strontium Titanate Oxalate Co-Precipitation Method X-Ray Diffraction Transmission Electron Microscope Ultra-Fine Powder

Bayesian autoregressive adaptive refined descriptive sampling algorithm in the Monte Carlo

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Statistical Theory and Related Fields 2023年第3期7卷 177-187页

作者： Djoweyda Ghouil Megdouda Ourbih-Tari Département de mathématiques Facultédes Sciences ExactesUniversitéde Tizi OuzouTizi OuzouAlgeria laboratoire demathématiques appliquées Facultédes Sciences Exactes et InformatiqueUniversitéde JijelJijelAlgeria Institute of Science University Center of TipazaTipazaAlgeria laboratoire de mathématiques appliquées Facultédes Sciences ExactesUniversitéde BejaiaBejaiaAlgeria

This paper deals with the Monte Carlo Simulation in a Bayesian *** shows the impor-tance of the use of Monte Carlo experiments through refined descriptive sampling within the autoregressive model Xt=ρXt-1+Yt,where 0dependent ran-dom variables following an exponential distribution of parameterθ.To achieve this,a Bayesian Autoregressive Adaptive Refined descriptive Sampling(B2ARDS)algorithm is proposed to esti-mate the parametersρandθof such a model by a Bayesian *** have used the same prior as the one already used by some authors,and computed their properties when the Nor-mality error assumption is released to an exponential *** results show that B2ARDS algorithm provides accurate and efficient point estimates.

关键词： Monte Carlo simulation reﬁned descriptive sampling methods variance reduction autoregressive process Bayesian estimation

The linearized Calderón Problem on Complex Manifolds

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Acta mathematica Sinica,English Series 2019年第6期35卷 1043-1056页

作者： Colin GUIllARMOU Mikko SAlO leo TZOU laboratoire de mathématiques d'Orsay Université Paris-Sud CNRS Université Paris-Saclay department of mathematics and Statistics University of Jyv?skyl? School of mathematics and Statistics University of Sydney

In this note we show that on any compact subdomain of a K?hler manifold that admits sufficiently many global holomorphic functions, the products of harmonic functions form a complete set. This gives a positive answer to the linearized anisotropic Calderón problem on a class of complex manifolds that includes compact subdomains of Stein manifolds and sufficiently small subdomains of K?hler manifolds. Some of these manifolds do not admit limiting Carleman weights, and thus cannot be treated by standard methods for the Calderón problem in higher dimensions. The argument is based on constructing Morse holomorphic functions with approximately prescribed critical points. This extends earlier results from the case of Riemann surfaces to higher dimensional complex manifolds.

关键词： Inverse problem Calderón problem complex manifold

WEll-POSEDNESS OF A NONlINEAR MOdel OF PROlIFERATing CEll POPUlATIONS WITH INHERITED CYClE lENGTH

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Acta mathematica Scientia 2016年第5期36卷 1225-1244页

作者： Abdul-Majeed Al-IZERI Khalid lATRACH Université Blaise Pascal(Clermont Ⅱ)laboratoire de mathématiques CNRS UMR 6620 Campus des Cézcaux-B.P.80026 63171 Aubière Cedex France

This paper deals with a nonlinear initial boundary values problem derived from a modified version of the so called lebowitz and Rubinow’s model [16] discussed in [8, 9]modeling a proliferating age structured cell population with inherited properties. We give existence and uniqueness results on appropriate weighted l~p-spaces with 1 ≤ p lls mortality σ and the transition rate k are depending on the total density of population. General local and nonlocal reproduction rules are considered.

关键词： evolution equation local and nonlocal boundary conditions quasi-accretive operators mild solutions,strong solutions local and global solutions