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SEDIMENTATION AND CONSOLIDATION OF A HIGH WATER CONTENT SOIL

International Journal of Sediment Research 2000年第3期15卷 269-276页

作者： ALEXIS Alain, LE BRAS Gilbert Researcher, Laboratoire de Genie Civil de Names saint-nazaire, iut de saint-nazaire, saint nazaire,France PHD Student, Laboratoire de Genie Civil de Names saint-nazaire, iut de saint-nazaire, saint nazaire,France Tel. 00 33 Lab. de Genie Civ. de nantes IUT de Saint-Nazaire Saint Nazaire France

The permanent siltation of harbours and estuaries has led their administrative companies to undertake dredging operations in order to guarantee a minimal water depth required for free access to port infrastructures. This long and expensive work interferes with the port trade. Dredged material is injected into the sea with the creation of a maritime dump or stocked on earth in basins. In each case, there will be a formation of a high water content soil. This paper deals with the geotechnical formation of high water content soils by means of an experimental laboratory sedimentation/consolidation bench. We have devised and realized a controlled bench which allows us to analyze the natural soil formation under self weight. The tested soil settles in sedimentation/consolidation columns (1.5 m. in height, 100 mm in diameter). Pressure and density measurements in the tested soil are possible on the whole height of the vertical column. Values of density are obtained by gamma-densimetry. The precision of the measurements is +/-0.5% for the density and +/-3 Pa for the pressures. Each test is performed over 32 days with 17 intermediate times. An originality of this bench lies in the fact that it allows measurements with a good precision in density and pressure at a very early state of soil formation (first values at 1 .33 min. from the beginning of the test). The test we are presenting concerned the natural mud found in the Loire estuary (France) prepared to an initial concentration of 200 g/ 1 (density 1. 135). These measurements are studied in terms of evolution of total stress, excess pore pressure, void ratio and effective stress as related to time. For this test, we present the density and pressure measured profiles as well as the deduced effective stress curves, paths of particles and rates of consolidation. On a void ratio versus effective stress diagram, we clearly show the evolution of soil consolidating under self weight during the intermediate phase of its formation

关键词： High water content soils Sedimentation/consolidation Density Pore pressure Effective stress Particle trajectory.

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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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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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High-order sliding mode control of a doubly salient permanent magnet machine driving marine current turbine

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Journal of Ocean Engineering and Science 2021年第1期6卷 12-20页

作者： Hao Chen Shifeng Tang Jingang Han Tianhao Tang Nadia Aït-Ahmed Zhibin Zhou Mohamed Benbouzid The Institute of Power Drive and Control Shanghai Maritime University201306ShanghaiChina Institut de Recherche en Energie Electrique de nantes Atlantique University of Nantes44602Saint-NazaireFrance ISEN Yncréa Ouest University of BrestFRE CNRS 3744 IRDL29200BrestFrance university of Brest UMR CNRS 6027 IRDL29238BrestFrance

Due to the harsh and changeable marine environment,one low speed stator-permanent magnet machine named doubly salient permanent magnet machine with toothed pole is applied for marine current energy conversion ***,this machine has simple structure,intriguing fault tolerance,and higher power density,which could adequately satisfy the different complicated operation ***,its permanent magnet flux-linkage has the same variation period as the inductance which leads to a strong nonlinear coupling ***,the torque ripple caused by this special characteristics,uncertainty of system parameters and disturbance of load greatly increases the difficulty of control in this strongly coupling ***,the classical linear PI controller is difficult to meet the system *** this paper,the high-order sliding mode control strategy based on the super-twisting algorithm for this system is creatively utilized for the first *** stability of the system within a limited time is also proved with a quadratic Lyapunov *** relative simulation results demonstrate convincingly that,the high-order sliding mode control has little chattering,high control accuracy and strong robustness.

关键词： Doubly salient permanent magnet machine Torque ripple Chattering High-order sliding mode control Super-twisting algorithm

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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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Two-level uncapacitated lot-sizing problem considering the financing cost of working capital requirement

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Frontiers of Engineering Management 2020年第2期7卷 248-258页

作者： Yuan BIAN David LEMOINE Thomas G.YEUNG Nathalie BOSTEL School of Economics and Management University of Chinese Academy of SciencesBeijing 100049China LS2N UMR CNRS 6004 IMT AtlantiqueNantes 44300France LS2N UMR CNRS 6004 University of NantesSaint-Nazaire 44606France

During financial crisis,companies constantly need free cash flows to efficiently react to any uncertainty,thus ensuring *** capital requirement(WCR)has been recognized as a key factor for releasing tied up cash in ***,in literatures related to lot-sizing problem,WCR has only been studied in the single-level supply chain *** this paper,we initially adopt WCR model for a multi-level case.A two-level(supplier–customer)model is established on the basis of the classic multi-level lot-sizing model integrated with WCR financing *** tackle this problem,we propose sequential and centralized approaches to solve the two-level case with a serial chain *** ZIO(Zero Inventory Ordering)property is further confirmed valid in both *** property allows us to establish a dynamic programming-based algorithm,which solves the problem in O(T).Finally,numerical tests show differences in optimal plans obtained by both approaches and the influence of varying delays in payment on the WCR of both actors.

关键词： two-level ULS problem lot-sizing working capital requirement ZIO property infinite production capacity

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亚心型四爿藻在CCCP作用下的光生物产氢的代谢途径

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微生物学通报 2011年第11期38卷 1666-1672页

作者：纪超凡虞星炬薛松陈兆安张卫中国科学院大连化学物理研究所辽宁大连116023 中国科学院研究生院北京100039 Universite de nantes Saint Nazaire 44600France Flinders university Adelaide 5001South Australia

以添加CCCP(羰基氰化物间氯苯腙,Carbonyl cyanide m-chlorophenylhydrazone)的海洋绿藻亚心型四爿藻光生物制氢为研究体系,使用作用于光合系统不同位点的抑制剂研究该藻产氢过程不同时段的代谢途径。结果表明:四爿藻光生物产氢前期电... 详细信息

以添加CCCP(羰基氰化物间氯苯腙,Carbonyl cyanide m-chlorophenylhydrazone)的海洋绿藻亚心型四爿藻光生物制氢为研究体系,使用作用于光合系统不同位点的抑制剂研究该藻产氢过程不同时段的代谢途径。结果表明:四爿藻光生物产氢前期电子主要来自PS Ⅱ光解水以及胞内分解代谢,电子经由光合电子传递链传递至氢酶产生氢气;而后期释放的氢气则是通过不依赖光合电子传递链的发酵途径产生。产氢过程厌氧发酵代谢途径主要产物是乙酸、乙醇,其中乙醇代谢途径和氢酶竞争NAD(P)H,不利于氢气的积累。

关键词：亚心型四爿藻产氢代谢厌氧发酵 CCCP

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