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Surface temperature field survey for laser heating of steels

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Chinese Journal of Lasers 1994年第4期B3卷 363-368页

作者： ZHU Zuchang LI Xiuqian YU Shaoluo(shanghai University of engineering Science,shanghai 200335, china) shanghai univ of engineering Science Shanghai China

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关键词： laser processing infrared irradiation temperature measurement heat Treatment

MOLECULAR DYNAMICS SIMULATION OF INTERFACIAL DEFECTS WITH MODIFIED POTENTIAL BASED ON THE FIRST-PRINCIPLE

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Acta Mechanica Solida Sinica 2010年第5期23卷 400-406页

作者： Dongwei Ren Jinquan Xu 1(School of Naval Architecture and Civil engineering,shanghai Jiaotong University,shanghai 200240,china) School of Naval Architecture and Civil engineering Shanghai Jiaotong University Shanghai China

The interfacial molecular structure of materials with different lattice constants is simulated by using the method of molecular dynamics （MD）. Potential of modified analytical embedded atom method （MAEAM） is used for nominterfacial atoms. To simulate the state of interracial atoms, further modifications are applied to the MAEAM potential based on the first- principle simulation results. It is concluded that a small change of potential may greatly influence the interfacial molecular structure. Void and diffusions can be observed in the simulation results. It is also found that the pre-existed dot defects before bonding can decrease the number of interfacial defects greatly, thereby, can increase the strength of the interface.

关键词： molecular dynamics interface defect potential first-principle

An Asymptotic Solvable Multiple “Look-Ahead” Model with Multi-weight

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Communications in Theoretical Physics 2007年第12期48卷 1088-1092页

作者： SHI Wei~1 CHEN Ning-Guo~1 and XUE Yu~(1,2)~1 Institute of Physical Science and engineering,Guangxi University,Nanning 530004,china~2 shanghai Institute of Applied Mathematics and Mechanics,shanghai University,shanghai 200072,china Institute of Physical Science and engineering Guangxi University Nanning 530004 China shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 China

A type of multiple "look-ahead" car-following models is studied by nonlinear *** mKdV equationto describe density wave of traffic jamming is *** result indicates that the behavior of multiple "look-ahead"is in favor of stability enhancement of traffic ***,the traffic flow can reach the most stable case viaadjustment of the parameter of weight functions m=3.

关键词： traffic flow car-following model nonlinear analysis mKdV equation

EXPERIMENTAL INVESTIGATION ON THE DRAG REDUCTION CHARACTERISTICS OF TRAVELING WAVY WALL AT HIGH REYNOLDS NUMBER IN WIND TUNNEL

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Journal of Hydrodynamics 2010年第5期22卷 719-724页

作者： YAO Yan LU Chuan-jing SI Ting ZHU Kun Department of engineering Mechanics Shanghai Jiao Tong University Shanghai 200240 China Beijing Electromechanic engineering Institute Beijing 100074 China State Key Laboratory of Ocean engineering Shanghai Jiao Tong University Shanghai 200030 China Department of Modern Mechanics University of Science and Technology of China Hefei 230027 China

Drag reduction experiments of the traveling wavy wall at high Reynolds number, ranging from 1.46×106 to 5.83×106 based on the free-stream velocity and the model length, were conducted. A suit of traveling wavy wall device was developed and its characteristics of drag reduction at high Reynolds number were investigated. The drag forces of the traveling wavy wall with various wave speeds （ c ） were measured at different wind speeds （U ） in the FL-8 low-speed wind tunnel and compared with the drag force of the flat plate. The results show that the mean drag force of the traveling wavy wall decreases as the value of c /U increases, at different wind velocities, the values of c /U corresponding to minimal drag force of the traveling wavy wall are different, when the values of c /U are larger than 0.6, the mean drag forces of the traveling wavy wall are smaller than those of the flat plate, and the drag reduction can be up to 60%. The drag reduction effectiveness of traveling wavy wall is thus achieved. Furthermore, as the value of c /U increases, the traveling wavy wall can restrain the separation and improve the quality of flow field.

关键词： flow control drag reduction traveling wavy wall wind tunnel test

Friction compensation design based on state observer and adaptive law for high-accuracy positioning system

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Progress in Natural Science:Materials International 2006年第2期16卷 147-152页

作者： WANG Ying, XIONG Zhenhua and DING Han (School of Mechanical engineering, shanghai Jiao Tong University, shanghai 200030, china) School of Mechanical engineering Shanghai Jiao Tong University Shanghai 200030 China

Friction is one of the main factors that affect the positioning accuracy of motion system. Friction compensation based on friction model is usually adopted to eliminate the nonlinear effect of friction. This paper presents a proportional-plus-derivative (PD) feedback controller with a friction compensator based on LuGre friction model. We also design a state observer to observe the unknown state of LuGre friction model, and adopt a parameter adaptive law and off-line approximation to estimate the parameters of LuGre friction model. Comparative experiments are carried out among our proposed controller, PD controller with friction compensation based on classical friction model, and PD controller without friction compensation. Experimental results demonstrate that our proposed controller can achieve better performance, especially higher positioning accuracy.

关键词： friction compensation state observer adaptive law linear motor motion control.

Metal chlorides loaded on activated carbon to capture elemental mercury

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Journal of Environmental Sciences 2010年第11期22卷 1814-1819页

作者： Zhemin Shen,Jing Ma,Zhijian Mei,Jianda Zhang School of Environmental Science and engineering,shanghai Jiao Tong University,shanghai 200240,china School of Environmental Science and engineering Shanghai Jiao Tong University Shanghai 200240 China

Activated carbon （AC） was considered to be an effective sorbent to control mercury in combustion systems. However, its capture capacity was low and it required a high carbon-to-mercury mass ratio. AC loaded with catalyst showed a high elemental mercury （Hg 0 ） capture capacity due to large surface area of AC and high oxidization ability of catalyst. In this study, several metal chlorides and metal oxides were used to promote the sorption capacity of AC. As a result, metal chlorides were better than metal oxides loaded on AC to remove gaseous mercury. X-ray diffractometer （XRD）, thermogravimetric analyzer （TGA） and specific surface area by Brunauer- Emmett-Teller method （BET） analysis showed the main mechanisms： first, AC had an enormous surface area for loading enough MClx; second, Cl and MxOy were generated during pyrogenation of MClx; finally, there were lots of active elements such as Cl and MxOy which could react with elemental mercury and convert it to mercury oxide and mercury chloride. The HgO and HgCl 2 might be released from AC’s porous structure by thermo regeneration. A catalytic chemisorption mechanism predominates the sorption process of elemental mercury. As Co and Mn were valence variable metal elements, their catalytic effect on Hg 0 oxidization may accelerate both oxidation and halogenation of Hg 0 . The sorbents loaded with metal chlorides possessed a synergistic function of catalytic effect of valence variable metal and chlorine oxidation.

关键词： mercury activated carbon flue gas metal chloride metal oxide

NUMERICAL SIMULATION OF TWO-DIMENSIONAL OVERTOPPING AGAINST SEAWALLS ARMORED WITH ARTIFICIAL UNITS IN REGULAR WAVES

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Journal of Hydrodynamics 2007年第3期19卷 322-329页

作者： LU Yong-jin LIU Hua WU Wei ZHANG Jiu-shan School of Naval Architecture Ocean and Civil Engineering Shanghai Jiaotong University Shanghai 200030 China shanghai Hydraulic engineering Design and Research Institute Shanghai 200063 China School of Naval Architecture Ocean and Civil Engineering Shanghai Jiaotong University Shanghai 200030China

A new mathematical model for the overtopping against seawalls armored with artificial units in regular waves was established. The 2-D numerical wave flume, based on the Reynolds Averaged Navier-Stokes （RANS） equations and the standard κ-ε turbulence model, was developed to simulate the turbulent flows with the free surface, in which the Volume Of Fluid （VOF） method was used to handle the large deformation of the free surface and the relaxation approach of combined wave generation and absorbing was implemented. In order to consider the effects of energy dissipation due to the armors on a slope seawall, a porous media model was proposed and implemented in the numerical wave flume. A series of physical model experiments were carried out in the same condition of the numerical simulation to determine the drag coefficient in the porous media model in terms of the overtopping discharge. Compared the computational value of overtopping over the seawall with the experimental data, the values of the effective drag coefficient was calibrated for the layers of blocks at different locations along the seawalls.

关键词： porous media overtopping seawall armored units 2-D numerical wave flume regular waves

Research on Hierarchical Supervision system and Emergency engineering for Pudong Industrial Zone in shanghai

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Research on Hierarchical Supervision System and Emergency En...

Design and Preparation of Bone Tissue engineering Scaffolds with Porous Controllable Structure

首届风险分析与危机反应国际学术研讨会

作者： WANG Xiao-qun ZHANG Xing-rong (shanghai Institute of Technology shanghai 200235 P. R. china)

＜正＞In order to strengthen the macroscopic supervision of dangerous sources in enterprises,hierarchical supervision systems must be built up in modern industrial *** article describes the present condition of production safety management in Pudong Industrial Zone,,and investigates a hierarchical monitoring system that is suitable for all enterprises in the industrial *** a hierarchical supervision system is explored by taking into account situations wherever production safety should be *** establishment of this system is based on the evaluation and calculation with the scientific safety evaluation method （hierarchy gray assessment method）.The purpose of hierarchical supervision is not only to prevent serious accidents but to minimize harm when an accident ***,the emergency engineering is also studied as an auxiliary measure.

关键词： Industrial Zone Hierarchical Supervision Evaluation system Hierarchy Gray Assessment Method Emergency

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Journal of Wuhan University of Technology(Materials Science) 2009年第2期24卷 174-180页

作者：林柳兰 College of Mechatronics engineering and Automation Shanghai University

A novel method of designing and preparing bone tissue engineering scaffolds with controllable porous structure of both macro channels and micro pores was proposed. The CAD software UG NX3.0 was used to design the macro channels＇ shape, size and distribution. By integrating rapid prototyping and traditional porogen technique, the macro channels and micro pores were formed respectively. The size, shape and quantity of micro pores were controlled by porogen particulates. The sintered β-TCP porous scaffolds possessed connective macro channels of approximately 500 μm and micro pores of 200-400 μm. The porosity and connectivity of micro pores became higher with the increase of porogen ratio, while the mechanical properties weakened. The average porosity and compressive strength offl-TCP scaffolds prepared with porogen ratio of 60wt% were 78.12% and 0.2983 MPa, respectively. The cells＇ adhesion ratio of scaffolds was 67.43%. The ALP activity, OCN content and cells micro morphology indicated that cells grew and proliferated well on the scaffolds.

关键词： bone tissue engineering scaffolds rapid prototyping porous structure