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Preparation, characterization, viscosity and thermal conductivity of CaCO_3 aqueous nanofluids

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science china(Technological sciences) 2010年第2期53卷 360-368页

作者： ZHU HaiTao1, LI ChangJiang2. WU DaXiong1, ZHANG CanYing1 & YIN YanSheng2.1 College of materials science and Engineering,{2., qingdao 2.6042. china 2.Department of materials, Ocean university of china, qingdao 2.6003, china 1. College of materials science and Engineering Qingdao University of Science and Technology Qingdao 266042 China2. Department of Materials Ocean University of China Qingdao 266003 China

CaCO3 aqueous nanofluids were prepared by dispensing aqueous CaCO3 paste into distilled water under ultrasonic vibration. The actual microstructures of the CaCO3 nanofluids with different particle volume fractions were characterized by freeze etching replication transmission electron microscopy (FERTEM). Thermal conductivity and rheological behavior of the nanofluids were measured by standard analyzers. The results show that CaCO3 paste as raw material for nanofluids is advantageous to reducing aggregation of primary nanoparticles. The effective viscosities and effective thermal conductivities of the CaCO3 nanofluids are related to the aggregates of nanoparticles and can be well predicted by the modified Krieger & Dougherty formula and the modified Hamilton & Crosser model, respectively.

关键词： CaCO3 nanofluid thermal conductivity viscosity microstructure

Effect of the silicon powder content on the properties of Al_2._3-SiC-Me composites

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science china(Technological sciences) 2009年第1期52卷 193-197页

作者： ZHANG ZhiHui1, RUAN GuoZhi1 & CHEN YunBo1,2.1 School of material science and Engineering, Shandong {2. of science and technology, qingdao 2.6510, china 2.Institute of material Engineering, china Academy of Machinery science and technology, Beijing 100083, china School of material science and Engineering Shandong University of Science and Technology Qingdao 266510 China Institute of material Engineering China Academy of Machinery Science and Technology Beijing 100083 China

By means of transient plastic phase process, the Al2.3-SiC-Me composites were produced throungh adding metal aluminium and silicon-powder to Al2.3-SiC materials. Under the condition of the same content of silicon and aluminium mixed-powder, the effect of silicon powder addition on properties of Al2.3-SiC-Me composites was studied by means of XRD and EPMA analyses in the temperature range of 300℃―1600℃. The results indicated that the content of metal phase in the sample at 1600℃ increases with increasing silicon powder content. At the same time, when the temperature is lower than 1100℃, the strength of samples gradually increases with increasing temperature. However when the temperature is higher than 1100℃, the strength of samples gradually decreases with increasing temperature, and this change is very small. The results also indicated that at the same sintering temperature, the sample with 6% silicon powder has the maximum strength.

关键词： composites strength ceramic

Annealing effect on InP vertical porous arrays

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science china(Technological sciences) 2010年第6期53卷 1562-1566页

作者： SU Ge1,LIU TianZhong2.LIU Wei1 & CAO LiXin1 1 Institute of material science and Engineering,Ocean {2. of china,qingdao 2.6100,china 2.qingdao Institute of BioEnergy and Bioprocess technology,Chinese Academy of sciences,qingdao 2.6101,china 1. Institute of material science and Engineering Ocean University of China Qingdao 266100 China2. Qingdao Institute of BioEnergy and Bioprocess Technology Chinese Academy of Sciences Qingdao 266101 China

InP vertical porous arrays were produced using electrochemical etching at room *** as-etched InP samples were annealed in an ultra high vacuum ***-sectional analysis of the porous layer was conducted using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX).Annealing in vacuum was found to meliorate the structural quality of the porous *** results showed the composition change of the porous *** controlling the annealing process parameters,the content ratio of phosphorus (P) to indium (In) is *** property of the samples was also investigated at room *** with the sample without annealing treatment,Raman spectrum from the annealed sample showed red-shifted LO and TO peaks together with sharpened LO peak and shortened TO peak.

关键词： InP vertical porous arrays annealing effect Raman property electrochemical etching

Enrichment mechanisms of rare earth elements in marine hydrogenic ferromanganese crusts

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science china Earth sciences 2011年第2期54卷 197-203页

作者： JIANG XueJun1,2.LIN XueHui1,2.YAO De3,4 & GUO WeiDong5 1 Key Laboratory of Marine Oil and Gas Resources and Marine environment,Ministry of Land and Resources,qingdao 2.6071,{2. 2.qingdao Institute of Marine Geology,{2. Geological Survey,qingdao 2.6071,{2. 3 Institute of Resources and environment,Shandong university of technology,Zibo 2.5049,{2. 4 Institute of Oceanology,Chinese Academy of sciences,qingdao 2.6071,{2. 5 Department of Oceanography,Xiamen university,Xiamen 361005,{2. 1. Key Laboratory of Marine Oil and Gas Resources and Marine environment Ministry of Land and Resources Qingdao 266071 China2. Qingdao Institute of Marine Geology China Geological Survey Qingdao 266071 China3. Institute of Resources and Environment Shandong University of Technology Zibo 255049 China4. Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China5. Department of Oceanography Xiamen University Xiamen 361005 China

A series of selective extraction experiments were conducted on marine hydrogenic ferromanganese crusts from the seamount near the Line Island to investigate the distribution of rare earth elements （REEs） and the mechanisms of combination between REEs and the hydrogenic ferromanganese crusts. The enrichment of REEs in hydrogenic ferromanganese crusts is attributed mainly to the mineral or oxide/hydroxide of the crust rather than the growth environment. The REEs are present mainly in amorphous ferric oxide/hydroxide rather than in 6-MnO2. Amorphous ferric oxide/hydroxide preferentially combines free REE3＋, while 6-MnO2.combines the REE-carbonate complexes in modern seawater. The REEs in seawater are combined more strongly with amorphous ferric oxide/hydroxides than with 6-MnO2. The positive Ce anomaly in hydrogenic ferromanganese crusts results from the oxidation of soluble Ce3＋ to insoluble Ce4＋ by the actively soluble oxygen of the bottom current rather than by the oxidation of δ-MnO2.

关键词： rare earth elements hydrogenic ferromanganese crust selective extraction experiment geochemistry combinationmechanism

Analysis on Influence Factors of Real-time Identification of Neural Network in Sheet Intelligent Bending

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稀有金属材料与工程 2011年第S3期40卷 14-18页

作者： Su Chunjian, Zhang Guangheng, Guo Sumin Shandong university of science and {2., qingdao 2.6510, china Shandong Univ Sci & Technol Coll Mech & Elect Engn Qingdao 266510 Peoples R China

The scheme of intelligent control system of cap-bending has been advanced in this paper using the neural network technology, based on the prominent problem that bending springback difficult to control accurately during the forming process of cap-bending. The key technology of real-time identification for {2. performance parameter and friction coefficient was researched, and the back-propagation neural network of real-time identification for {2. performance parameters and friction coefficient was established, which can real-time identify the needed {2. performance parameters through the real-time monitoring variable. Factors that affecting recognition results of neural network model were analyzed, such as influences of the selection of the sample date and the algorithm for identification result. Factors affecting neural network generalization ability were discussed, such as influences of the selection of the sample date and the node number of the hidden layer for generalization ability. The results provide a guarantee for improving the convergence accuracy and the generalization ability of network, and provide a basis for the building of intelligent bending control of network model.

关键词： sheet bending intelligent control real-time identification influence factor

Early Hydration of Composite Cement with Thermal Activated Coal Gangue

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Journal of Wuhan university of technology({2.s science) 2010年第1期25卷 162-166页

作者：郭伟 Department of material Engineering Yancheng Institute of Technology Institute of material science and Engineering Nanjing University of Technology

Composite cement samples were prepared by mixing clinker, gypsum with burnt coal gangues which was calcined at various temperatures. The mechanical strength and Ca（OH）2.content in the cement paste were tested, and the paste composition and microstructure were analyzed by thermogravimetry-differential thermal analysis （TG-DSC）, X-ray diffraction（XRD）, scanning electronic microscopy （SEM） and pore structure analysis. Results demonstrate that the thermal activated coal gangue could accelerate the early hydration of cement clinker obviously, which promotes the gangue hydration itself. The early hydrated products of the cement are C-S-H gel, Ca（OH）2.and AFt. The cement with 30% （in mass） the gangue exhibits higher mechanical strength, and among all the cement samples the one with the gangue burnt at 700 ℃ displays the highest hydration rate, mechanical strength, the most gel pores and the lowest total porosity.

关键词： blended cement hydration microstructure hydration product

Structure and Pozzolanic Activity of Calcined Coal Gangue during the Process of Mechanical Activation

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Journal of Wuhan university of technology({2.s science) 2009年第2期24卷 326-329页

作者：郭伟 Department of material Engineering Yancheng Institute of Technology Institute of material science and Engineering Nanjing University of Technology

On the basis of analyzing coal gangue＇s chemical and mineral compositions, the structure change of coal gangue during the mechanical activation was investigated by XRD, FTIR, NMR, and the mechanical strength of the cement doped coal gangue with various specific surface area was tested. The experimental results indicate that, the lattice structure of metakaolin in coal gangue samples calcined at 700 ℃ disorganizes gradually and becomes disordered, and the lattice structure of α-quartz is distorted slightly. The pozzolanic activity of the coal gangue increases obviously with its structural disorganization.

关键词： coal gangue mechanical activation structure NMR tetrahedron

Israeli Water Achievements Today and Enlightenment to china

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Chinese Journal of Population,Resources and environment 2008年第4期6卷 72-77页

作者： Sun Lei1,2. Xu Lanqing3 1. Institute of environmental science and Engineering, Ocean {2. of china, qingdao Shandong 2.6100, china 2. Department of Soil and Water sciences, Faculty of Agricultural, Food and environmental Quality sciences, the Hebrew {2. of Jerusalem, 76100, Israel 3. Logistics Group of Ocean {2. of china, qingdao Shandong 2.6100, china Institute of environmental science and Engineering Ocean University of China Qingdao Shandong 266100 China Department of Soil and Water sciences Faculty of Agricultural Food and Environmental Quality Sciences the Hebrew University of Jerusalem 76100 Israel Logistics Group of Ocean university of china Qingdao Shandong 266100 China

Despite the endemic drought, arid climate and associated limited freshwater resources, as well as difficult geopolitical realities, Israel can provide a reliable supply of high quality water to a rapidly growing population. The achievements of water supply in Israel can be summarized as water technologies (like water transportation and purification, desalination, wastewater treatment, effluent reuse, storm water catchment, control systems, rain enhancement and drip irrigation, etc.), water management and legislation as well as water industry. In view of the national concern regarding the quality and quantity of the water, the skills, technologies and know-how that Israel has accumulated in water supply and irrigation can give us enlightenment that is also presented in this paper.

关键词： Israel china water technology water management water industry

HCWCI/Carbon Steel Bimetal Liner by Liquid-Liquid Compound Lost Foam Casting

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Journal of Iron and Steel Research International 2012年第10期19卷 13-19页

作者： XIAO Xiao-feng1,2. YE Sheng-ping2. YIN Wei-xin3, XUE Qiong4 (1. School of Mechanical Engineering and Automation, Wuhan Textile university, Wuhan 430073, Hubei, china 2. State Key Laboratory of {2. Processing and Die and Mould technology, Huazhong university of science and technology, Wuhan 430074, Hubei, china 3. Wuhan Zhike Abrasive-Resistant {2. science and technology Development Co Ltd, Wuhan 430073, Hubei, china 4. College of science, Wuhan university of technology, Wuhan 430079, Hubei, china) [a] School of Mechanical Engineering and Automation Wuhan Textile University Wuhan 430073 Hubei China [b] State Key Laboratory of material Processing and Die and Mould technology Huazhong University of Science and Technology Wuhan 430074 Hubei China [c] Wuhan Zhike Abrasive-Resistant material science and {2. Development Co Ltd Wuhan 430073 Hubei China [d] College of science Wuhan University of Technology Wuhan 430079 Hubei China

Impact, friction and corrosion from the grinding balls and the grinding medium during the mineral processing result in liner breakage. Liner, made from Hadfield steel or alloyed steel, could not have served in wet grinding environment for more than ten months. Composite liner, made from HCWCI (high Cr white cast iron) and carbon steel, has been developed successfully with liquid-liquid composing process based on LFC (lost foam casting). The microstructure of composite was analyzed with optical microscope, SEM (scanning electron microscope)/EDX energy-dispersive X-ray and XRD (X-ray diffraction). According to micrograph, the combination region of two metals was staggered like dogtooth, no mixtures occurred between two liquid metals, and its interface presented excellent metallurgical bonding state. The results of mechanical property test show that, the hardness of HRC, the fracture toughness, and the bending strength are more than 61, 16.5 J/cm2.and 1 600 MPa, respectively. Comparison between liners made from bimetal composite and alloyed steel has also been investigated in industrial hematite ball mill. The results of eight months test in wet grinding environment prove that the service life of bimetal composite liner is three times as long as that of one made from alloyed steel.

关键词： composite liner bimetal liquid-liquid compound composite interface lost foam casting high Cr white cast iron