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RESEARCH ON MEASURING METHOD OF THE THERMALCONDUCTIVITY FOR HIGHLY POROUS MATERIALS

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Acta Metallurgica Sinica(English Letters) 1997年第3期10卷 213-218页

作者： J Y Wu Z.M. Tang W Shi andR.Z. Wang (institute of Refrigeration and Cryogenics engineering, Shanghai {2. tong university, Shanghai 2.0030,china) Shanghai jiaotong Univ Shanghai China

A transient method with rectangular pulse heating has been developed to measure the thermal conductivity of highly porous materials such as activated carbon, zeolite and silica gel. By this method the thermal conductivity can be measured quickly and accu-rately. In this paper, a set of automatically controlled testing equiptnent is *** measuring method is analysed. The thermal conductivities of some samples, such as activated carbon and zeolite, are measured by the equipment. A group of useful data has been obtained.

关键词： thermal conductivity porous material thermophysical property

INFLUENCES OF NATURE FRIENDLY RIVERTRAINING WORKS ON BED LOAD TRANSPORT

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International Journal of Sediment Research 1999年第2期14卷 59-64页

作者： Zhi-Gang SHEN (Department of engineering Mechanics, Shanghai jiao {2. university, 2.02.0 Shanghai, china)

Nature-friendly river training measures to restore streams to their natural appearance can significantly alter their hydraulic and bed load transport behavior. A systematic theory is however still lacking. By means of laboratory experiments the present paper discussed the initial motion of the bed sand as well as the bed load transport behavior of the rivers with nature-friendly bed works. An experimental formula, based on the dimensional analysis and the regression analysis of the flume data, was presented for the evaluation of bed load transport.

关键词： Nacre-friendly measures Flow resistance Competent velocity Bed load transport

Finite element simulation of stretch forging using a mesh condensation method

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Science china(Technological Sciences) 2010年第1期53卷 227-234页

作者： CHEN Wen & CUI ZhenShan National Die & Mold CAD engineering Research Center,Shanghai jiao {2. university,Shanghai 2.0030,china 1. National Die & Mold CAD engineering Research Center Shanghai Jiao Tong University Shanghai 200030 China

In order to reduce the computation time of finite element simulations of stretch forging process,a mesh condensation method is presented and applied to a three-dimensional rigid-viscoplastic finite element *** this method,a conventional mesh for the whole zone of a workpiece is condensed to a computational mesh for the active deformation *** vital problems are solved,which are automatic construction of the computational mesh and treatment of interfaces between the deformation zone and the rigid *** mesh condensation method is compared with conventional finite element method by simulations of a six-bite stretch forging *** simulation results including forging load,temperature distribution and effective strain distribution are *** efficiency and accuracy of this method are verified.

关键词： mesh condensation method finite element method stretch forging incremental forging

Modeling Study of the Particle Pinning Effect on the Grain Boundary Movement

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Journal of Iron and Steel Research International 2011年第S1期18卷 342-345页

作者： WANG Xue-lun 1,FU Li-ming 2.WANG Wei 3,JIA Zhi-xin 1 (1.Rizhaosteel Technology Center,Rizhao Iron and Steel Co Ltd.Rizhao 2.6806,china 2.School of Materials Science and engineering,Shanghai {2.tong university,Shanghai 2.02.0 china 3 Department of Structural Steels,Baosteel Research institute,Shanghai 2.1900,china) Rizhao Iron & Steel Co Ltd Rizhaosteel Technol Ctr Rizhao 276806 Peoples R China Shanghai jiao tong Univ Sch Mat Sci & Engn Shanghai 200240 Peoples R China Baosteel Res Inst Dept Struct Steels Shanghai 201900 Peoples R China

In this work,based on the classical grain boundary (GB) formula and the principle of work-energy conversion,a new physically-based model has been developed to predict the particle pinning force concerning the interaction between second phase particles (SPPs) and the moving *** effect of particles pinning on the GB movement is *** modeling results can be applied to quantitatively determine the critical numbers of SPPs required for complete pining the grain growth,such as the critical SPPs number of the unit GB area,the critical number for single grain stagnation,the critical volume fraction of particles at a given particle *** predictions are in good agreement with the experimental results by Gladman.

关键词： the second-phase particle pinning force physical-based model

Traveling－Wave　Electrooptical　Modulator　on　Polymeric　Film　with　Reversal　Poling　Structure

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Chinese Journal of Lasers 1994年第1期B3卷 57-61页

作者： ZHOU Yi CHEN Yixin(Department of Applied Physics, Shanghai jiao tong {2., Shanghai2.0030, china)SUN Shiping(Department of Electronical engineering ,Shanghai jiao tong {2. , Shanghai 2.0052. china) Shanghai jiaotong Univ Shanghai China

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关键词： reversal poling Electrooptical effect modulator

Phosphate removal and recovery through crystallization of hydroxyapatite using xonotlite as seed crystal

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Journal of Environmental Sciences 2009年第5期21卷 575-580页

作者： CHEN Xuechu, KONG Hainan, WU Deyi, WANG Xinze, LIN Yongyong School of Environmental Science and engineering, Shanghai jiao {2. university, Shanghai 2.02.0, china [a]School of Environmental Science and engineering Shanghai Jiao Tong University Shanghai 200240 China

Xonotlite was synthesized and tested for phosphate removal and recovery from synthetic solution in a batch mode. The effects of pH, initial calcium concentration, bicarbonate concentration on phosphate removal through crystallization were examined. The morphology and X-ray diffraction （XRD） pattern of xonotlite before and after crystallization confirmed the formation of crystalline hydroxyapatite. The results indicated that the crystallization product had a very high P content （〉 10%）, which is comparable to phosphate rock at the dosage of 50-2.0 mg xonotlite per liter, with a maximum P content of 16.7%. The kinetics of phosphate removal followed the second-order reaction equation. The phosphate removal ability increased with increasing pH. The precipitation of calcium phosphate took place when pH was higher than 7.2. whereas the crystallization occurred at pH 6.0. A high calcium concentration could promote the removal of phosphate via crystallization, while a high bicarbonate concentration also enhanced phosphate removal, through that the pH was increased and thus induced the precipitation process. When xonotlite was used to remove phosphate from wastewater, the removal efficiency could reach 91.3% after 2. h reaction, with removal capacity 137 mg/g. The results indicated that xonotlite might be used as an effective crystal seed for the removal and recovery of phosphate from aqueous solution.

关键词： phosphate recovery crystallization xonotlite

Effect of Solute Drag and Precipitate Pinning on Austenite Grain Growth in Ti-Nb Microalloyed Steels

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Journal of Iron and Steel Research International 2011年第S1期18卷 383-387页

作者： FU Li-ming 1,WANG Huan-rong 2.WANG Wei 2.SHAN Ai-dang 1 (1.School of Materials Science and engineering,Shanghai jiao{2. university,Shanghai 2.02.0,china 2.Department of Structural Steels,Baosteel Research institute,Shanghai 2.1900,china) Shanghai jiao tong Univ Sch Mat Sci & Engn Shanghai 200240 Peoples R China Baosteel Res Inst Dept Struct Steels Shanghai 201900 Peoples R China

A metallurgical model concerning the co-effect of the Nb solute drag and the complex carbonitride precipitates pinning is proposed to predict the recrystallization austenite grain growth of low carbon Nb-containing microalloyed *** analysis,both predicted and experimental,reveals the precipitate pinning plays a dominate role in suppressing the austenite grain growth with less Nb solute drag effect in high temperature region whereas the Nb solute drag predominates in relatively low temperature region.A factor p is suggested to assess the effectiveness of drag and *** pinning and the drag are more effective in restraining grain growth as p>0 and p<0,respectively.A low carbon Nb microalloyed steel and a kind of Ti-modified low carbon Nb steel by Ti substituting for part of Nb are employed to validate the modeling *** theoretical calculations show a good agreement with experimental results.

关键词： grain growth precipitates pinning solute drag Ti-Nb microalloyed steels

HYDRODYNAMIC SIMULATION TO MOLD FILLING UNDER COUNTER GRAVITY

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Acta Metallurgica Sinica(English Letters) 2000年第2期13卷 780-783页

作者： J.M. Zeng and Y.H. Zhou 1) institute of Materials Science, Guangxi university, Nanning 530004, {2. 2. Department of Materials Science and engineering, Shanghai jiao tong university, Shanghai 2.0030, {2.

In situ observations of the flow morphology during mold filling under counter gravity are conducted on a perspex water model by means of flow visualization, high speed photography and pattern processing. The experimental results indicate that influences of the dynamic factors on flow morphology can be expressed quantitatively with the parameterφ(k). The flow field takes on different morphology with change in values of φ(k). For thick and thin walled castings, the main dynamic factors influencing flow morphology are gravity and surface tension respectively. Under general circumstances, F_r and W_e should be equal in their values to guarantee the similarity between the prototype and the model in simulating mold filling under counter gravity by experiment.

关键词： casting mold filling hydrodynamics

Natural Mordenite Catalyst Used on the Ammoniation of Methanol

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Chinese Chemical Letters 2001年第6期12卷 527-528页

作者： Li Qiu MAO1, tong Lai ZHANG1, Chang Gen FENG1, Qing Ze jiao2. Da Zhen JIANG2.1Department of mechano-electronic {2., Beijing institute of Technology, Beijing 100081 2.epartment of Chemistry, Jilin university, Changchun 13002. Beijing Inst Technol Dept Mechanoelect Engn Beijing 100081 Peoples R China Jilin Univ Dept Chem Changchun 130023 Peoples R China

The catalytic properties of natural mordenite as acidic catalysts were investigated using the ammoniation of methanol.

关键词： ammoniation of methanol natural mordenite catalytic activity