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Porous media grain size distribution and hydrodynamic forces effects on transport and deposition of suspended particles

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Journal of Environmental Sciences 2017年第3期29卷 161-172页

作者： Nasre-Dine Ahfir Ahmed Hammadi Abdellah Alem HuaQing Wang Gilbert Le Bras Tariq Ouahbi Normandie University UNIHAVREUMR 6294 CNRSLOMC76600 Le HavreFrance GeM UMR 6183 CNRSUniuersite de NantesBP 42044606 Saint Nazaire CedexFrance

The effects of porous media grain size distribution on the transport and deposition of polydisperse suspended particles under different flow velocities were investigated. Selected Kaolinite particles （2-30 μm） and Fluorescein （dissolved tracer） were injected in the porous media by step input injection technique. Three sands filled columns were used： Fine sand, Coarse sand, and a third sand （Mixture） obtained by mixing the two last sands in equal weight proportion. The porous media performance on the particle removal was evaluated by analysing particles breakthrough curves, hydro-dispersive parameters determined using the analytical solution of convection-dispersion equation with a first order deposition kinetics, particles deposition profiles, and particle-size distribution of the recovered and the deposited particles. The deposition kinetics and the longitudinal hydrodynamic dispersion coefficients are controlled by the porous media grain size distribution. Mixture sand is more dispersive than Fine and Coarse sands. More the uniformity coefficient of the porous medium is large, higher is the filtration efficiency. At low velocities, porous media capture all sizes of suspended particles injected with larger ones mainly captured at the entrance. A high flow velocity carries the particles deeper into the porous media, producing more gradual changes in the deposition profile. The median diameter of the deposited particles at different depth increases with flow velocity. The large grain size distribution leads to build narrow pores enhancing the deposition of the particles by straining.

关键词： Suspended particlesPorous mediaGrain size distributionStructured heterogeneityStrainingParticle size distribution

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TOWARDS A BETTER FORECAST FOR RESERVOIR SLOPE SLIDING

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International Journal of Sediment Research 2003年第4期18卷 278-289页

作者： Didier MAROT,Alain ALEXIS,Pierre THOMAS Doctor IUT de saint nazaire Laboratolre Génie Civil Nantes-saint nazaire. BP 420 44606 saint nazaire cedex Doctor-Engineer IUT de saint nazaire Laboratoire Génie Civil Nantes-saint nazaire. BP 420 44606 saint nazaire cedex Professor IUT de saint nazaire Laboratoire Génie Civil Nantes-saint nazaire. BP 420 44606 saint nazaire cedex

The siltation of reservoir causes many problems of management and environmental disturbances that are important to minimize. Solving these problems requires in particular a good knowledge of mud bank instabilities. In partnership with the Laboratoire National d'Hydraulique (LNH), a subsidiary of Electricite de France (E.D.F.), authors realize a study of soft soils sliding entailed by reservoir emptying. Using a geotechnical flat sliding mechanism, the theoretical formulation of the safety factor can be established when the sediment mass is submerged and emergent. The measurement campaign carried out makes it possible to obtain bathymetric and topographic surveys and a geotechnical characterization of the soil for the whole reservoir of Grangent dam, located on the Loire (France). The proposed model appears to agree satisfactorily with the instability of the zones emerged because of the emptying and with the stability of the profile after emptying. The use of this model within the framework of forecasts

关键词： Soft soils Mud Bank Sliding Dam reservoir Emptying

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An integrated approach for modeling and solving the scheduling problem of container handling systems

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第2期7卷 234-239页

作者：陈璐奚立峰蔡建国 BOSTEL Nathalie DEJAX Pierre School of Mechanical Engineering Shanghai Jiao Tong University IRCCyN–Nantes Cybernetic and Communication Research Institute BP 92 101 44321 Nantes Cedex 03 France Department of Automatic Control and Industrial Engineering Ecole des Mines de Nantes The Chantrerie F-44070 Nantes Cedex 03 France IUT of saint nazaire of Nantes University GLT Department 58 Michel Ange 44606 Saint Nazaire Cedex France

An integrated model is presented to schedule the container handling system. The objective is to improve the coop- eration between different types of equipments, and to increase the productivity of the terminal. The problem is formulated as a Hybrid Flow Shop Scheduling problem with precedence constraint, setup times and blocking (HFSS-B). A tabu search algorithm is proposed to solve this problem. The quality and efficiency of the proposed algorithm is analyzed from the computational point of view.

关键词： Container terminal Scheduling Tabu search Hybrid flow shop Makespan

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一种求解带有阻塞限制的混合流水车间的禁忌搜索算法

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上海交通大学学报 2006年第5期40卷 856-859页

作者：陈璐奚立峰蔡建国 Nathalie Bostel Pierre Dejax 上海交通大学机械与动力工程学院 .Dept.of Automatic Control and Industrial Eng. IRCCyN-Institute de Recherche en Communication et Cybernétique de Nantes FranceI UT de Saint Nazaire de l'universitéde NantesDépartement GLT58 rue Michel Ange44606 Saint Nazaire CedexFrance Dept.of Automatic Control and Industrial Eng. Ecole des Mines de NantesLa ChantrerieF-44070 Nantes Cedex 03France I UT de saint nazaire de l’universitéde Nantes Département GLT58 rue Michel Ange44606 Saint Nazaire CedexFrance

针对带有阻塞限制的混合流水车间调度问题,提出一种禁忌搜索算法和优先级规则相结合的方法.开发了启发式调度算法求出问题初始解,应用禁忌搜索算法对工件在第一级的排序进行优化,采用优先级规则进行其他级工件的排序.实验结果表明,该方... 详细信息

针对带有阻塞限制的混合流水车间调度问题,提出一种禁忌搜索算法和优先级规则相结合的方法.开发了启发式调度算法求出问题初始解,应用禁忌搜索算法对工件在第一级的排序进行优化,采用优先级规则进行其他级工件的排序.实验结果表明,该方法大大缩减了搜索空间,能够较好地解决此类调度问题.

关键词：混合流水车间禁忌搜索启发式算法优先级规则

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PHBV Crystallization under Injection Molding Conditions:Influence of Packing Pressure and Mold Temperature

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Journal of Renewable Materials 2018年第3期6卷 270-276页

作者： G.El hajj Sleiman G.Colomines R.Deterre I.Petit E.Leroy S.Belhabib UBL IUT NantesCNRSGEPEAUMR 6144OPERP2 Avenue du professeur Jean ROUXELBP 53944475 CarquefouFrance UBL CNRSGEPEAUMR 6144CRTT37Boulevard de l’Université44606 St Nazaire CedexFrance

Poly(3-hydroxy butyrate)-co-(3-hydroxy valerate)(PHBV)is a biobased and biodegradable *** semicrystalline bioplastic could be a good candidate for the replacement of some commodity plastics derived from ***,the control of the conditions of its processing in order to obtain optimal properties of the finished products remains a current research *** objective of this work is to better understand the crystallization under injection molding conditions by inline measurements during the *** focused on the influence of two key processing parameters,namely,mold temperature and packing *** modeling of inline temperature measurements allowed an inverse estimation of the thermodynamic melting temperature of PHBV and of the heat of crystallization’s variations with processing parameters.

关键词： Crystallization PHBV injection molding inline measurement

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Natural Rubber-Based Ionogels

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Journal of Renewable Materials 2018年第3期6卷 251-258页

作者： TK.N.Tran A.Guyomard-Lack C.Cerclier B.Humbert G.Colomines J-F.Pilard R.Deterre J.Le Bideau E.Leroy UBL IUT of NantesCNRSGEPEAUMR 61442 Avenue du professeur Jean ROUXELBP 53944475 CarquefouFrance UBL University of MaineUMR CNRS 6283Institute of Molecules and Materials of Le MansAvenue Olivier Messiaen72085 Le Mans Cedex 9France Institut des Matériaux Jean Rouxel(IMN) Universitéde NantesCNRS2 rue de la HoussinièreBP 3222944322 Nantes cedex 3France UBL CNRSGEPEAUMR 6144CRTT37Boulevard de l’Université44606 St Nazaire CedexFrance

Natural rubber(NR),besides being an abundant renewable resource for the elastomer industry,can be a potential resource for the design of innovative biobased polymer *** present work is based on“telechelic”liquid natural rubber oligomers obtained by controlled chemical degradation of *** chain ends of such oligomers can then be functionalized(with acrylate functions in the present case)and reacted with multifunctional crosslinkers in order to form ***’s more,the initial solubility of such thermosetting system in an ionic liquid(IL)can be used for the formulation of *** solid networks typically containing 80%of IL were produced,resulting in high ionic conductivity *** oligomer chain length was shown to affect IL fragility due to confinement and specific interactions of ions with the host polymer network.

关键词： Natural rubber oligomers ionogels confinement ionic conductivity

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Modeling and optimization of induction cooking by the use of magneto-thermal finite element analysis and genetic algorithms

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Frontiers of Electrical and Electronic Engineering in China 2012年第3期7卷 312-317页

作者： Abdelkader KANSSAB Abdelhalim ZAOUI Mouloud FELIACHI Departement d'Electrotechnique University of Hassiba BenboualiChlef 02000 Algeria Military Polytechnic School BP17 B.E.Bahri Algiers Algeria PRES-L'UNAM IREENA Bd de l'Universit6 BP 406 44602 St-Nazaire cedex France

Induction cooking has several advantages compared to traditional heating system; however, to obtain best efficiency, it is essential to have an inductor giving homogeneous temperature on the pan bottom. For this aim, we propose a structure of inductor with four throats containing coils and optimize their distribution. In this paper, first we model magneto-thermal phenomenon of the system by a finite element method （FEM） for the mean to determine the distribution of temperature on the pan bottom by taking the nonlinearity of system. This study shows that a temperature distribution is not homogeneous. Second, with the aim to have homogeneous temperature distribution on the pan bottom, the optimal determination of throats distribution and their dimensions is obtained by genetic algorithms （GAs）. The optimized structure permits to satisfy our aim.

关键词： finite element method magneto-thermaldevices genetic algorithms

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Uncertainty Propagation of Structural Computation for Fatigue Assessment

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Journal of Marine Science and Application 2022年第4期21卷 55-66页

作者： Ludovic Mell Valentine Rey Franck Schoefs Benjamin Rocher Nantes Université École Centrale NantesCNRSGeMUMR 6183F-44000 NantesFrance Chantiers de l’Atlantique Avenue Bourdelle-CS90180St-Nazaire CEDEX 44613France

Offshore wind substations are subjected to uncertain loads from waves,wind and *** states are composed of irregular waves which statistics are usually *** loads may induce fatigue failure of some structural components of the *** combining fatigue damage computed through numerical simulations for each sea state endured by the structure,it is possible to assess fatigue failure of the structure over the whole deployment ***,the influence of the discretization error on the fatigue damage is rarely *** is possible to estimate the discretization error on the quantity of interest computed at the structural detail suspected to ***,the relation between this local quantity of interest and the fatigue damage is *** this paper,a method that allows propagating error bounds towards fatigue damage is *** increasing computational burden,computing discretization error bounds is a useful output of finite element *** can be utilized to either validate mesh choice or guide remeshing in case where potential error on the fatigue damage is too *** method is applied to an offshore wind substation developped by Chantiers de l’Atlantique using two discretization error estimators in a single sea state.

关键词： Offshore wind turbines Uncertainty propagation Fatigue damage Discretization error

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Magneto-Thermal Finite Element Analysis and Optimization by Neural Network of Induction Cooking

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材料科学与工程（中英文A版） 2013年第9期3卷 653-658页

作者： Allaoui Fethi Kansab Abdelkader Matallah Mohamed Zaoui Abdelhalim 3 and Feliachi Mouloud Faculty of Science and Technology Department of Technology University of Khemis Miliana 044000 Algeria Faculty of Technology Department of Electrical Engineering University of Hassiba Benbouali Chief02000 Algeria Ecole Militaire Polytechnique BP17 Bordj-El-Bahri Algiers 16111 Algeria IREENA-IUT CRTT University avenue BP 406 Saint-Nazaire Cedex 44602 France

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