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Experimental study of dynamic mechanical properties of reactive powder concrete under high-strain-rate impacts

science China(Technological sciences) 2010年第9期53卷 2435-2449页

作者： JU Yang1,2,LIU HongBin1,SHENG GuoHua1,3 & WANG HuiJie1 1 State Key Laboratory of Coal Resources and Safe Mining,Beijing Key Laboratory of Fracture and Damage Mechanics of Rocks and Concrete,China university of Mining and Technology,Beijing 100083,China 2 Department of Mechanical and Manufacturing engineering,university of Calgary,2500 university Drive,AB T2N 1N4,Canada 3 school of Resources and Civil engineering,northeastern university,shenyang 110004,China State Key Laboratory of Coal Resources and Safe Mining Beijing Key Laboratory of Fracture and Damage Mechanics of Rocks and Concrete China University of Mining and Technology Beijing China Department of Mechanical and Manufacturing engineering University of Calgary Calgary Canada school of Resources and Civil engineering Northeastern University Shenyang China

The dynamic mechanical properties of reactive powder concrete subjected to compressive impacts with high strain rates ranging from 10 to 1.1×102 s-1 were investigated by means of SHPB (split-Hopkinson-pressure-bar) tests of the cylindrical specimens with five different steel fiber volumetric *** properties of wave stress transmission,failure,strength,and energy consumption of RPC with varied fiber volumes and impact strain rates were *** influences of impact strain rates and fiber volumes on those properties were characterized as *** general forms of the dynamic stress-strain relationships of RPC were modeled based on the experimental *** investigations indicate that for the plain RPC the stress response is greater than the strain response,showing strong brittle *** RPC with a certain volume of fibers sustains higher strain rate impact and exhibits better deformability as compared with the plain *** a constant fiber fraction,the peak compressive strength,corresponding peak strain and the residual strain of the fiber-reinforced RPC rise by varying amounts when the impact strain rate increases,with the residual strain demonstrating the greatest *** the fiber content makes trivial contribution to improving the residual deformability of RPC when the impact strain rate is *** tests also show that the fiber content affects the peak compressive strength and the peak deformability of RPC in a different *** a constant impact strain rate and the fiber fraction less than 1.75%,the peak compressive strength rises with an increasing fiber *** peak compressive strength tends to decrease as the fiber volume exceeds 1.75%.The corresponding peak strain,however,incessantly rises with the increasing fiber *** total energy Edisp that RPC consumed during the period from the beginning of impacts to the time of residual strains elevates with the fiber volume increment as long as the fiber fraction

关键词： impact reactive powder concrete (RPC) high strain rate dynamic strength energy consumption dynamic stress-strain response

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Structure and Magnetic Properties of Fe_(76.5)Si_(13.5)B_9Cu_1 Alloy with Nanoscale Grain Size

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Journal of Materials science & Technology 1994年第6期10卷 430-434页

作者： Fei ZHOU Kaiyuan HE Lizhi CHENG and Zuhan LAI(Dept. of Materials science and engineering, northeastern university, shenyang, 110006, China)( Dept. of Phys., northeastern university) northeastern Univ Shenyang China

The structure and magnetic properties of Fe76.5Si13.5B9Cu1 alloys with a nanocrystalline (NC) bcc Fe(Si) phase trom about 23 to 46 nm in diameter, which were first formed into amorphous ribbons and then annealed at various temperatures between 703 and 773 K, have been investigated. At annealing temperatures from 703 to 748 K, the single NC bcc(Si) phase is obtained in the crystallized alloys. The grain size and the Si-content in the NC bcc Fe(Si) phase for the alloys annealed at different temperatures are presented. The soft magnetic properties and the saturation magnetostriction for the alloys with the NC bcc Fe(Si) phase are also measured. The results show that, the saturation magnetizotion and the permeability are improved for the alloys with only the NC bcc Fe(Si) phase and become better with decreasing of the NC bcc phase size, and the saturation magnetostriction declines for the alloys with increasing Si-content in the NC bcc Fe(Si) phase.

关键词： Si Structure and Magnetic Properties of Fe B9Cu1 Alloy with Nanoscale Grain Size Cu

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In situ experiments on width and evolution characteristics of excavation damaged zone in deeply buried tunnels

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science China(Technological sciences) 2011年第S1期54卷 167-174页

作者： LI ShaoJun 1,FENG XiaTing 1,LI ZhanHai 3,CHEN BingRui 1,JIANG Quan 1,WU ShiYong 2,HU Bin 2 &XU JinSong 2 1 State Key Laboratory of Geomechanics and Geotechinical engineering,Institute of Rock and Soil Mechanics,Chinese Academy of sciences,Wuhan 430071,China 2 Ertan Hydropower Development Company,Ltd.,Chengdu 610051,China 3 school of Resources and Civil engineering,northeastern university,shenyang 110004,China State Key Laboratory of Geomechanics and Geotechinical engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan China school of Resources and Civil engineering Northeastern University Shenyang China Ertan Hydropower Development Company Ltd. Chengdu China

The seven long tunnels of Jinping II hydropower station are deeply *** width and evolution characteristics of excavation damaged zone(EDZ) are the key problem to the design of tunnels excavation and *** order to study this problem,several specific experimental tunnels with different overburden and geometric sizes were excavated at this *** borehole camera,sliding micrometer,cross-hole acoustic wave equipment and acoustic emission apparatus were *** paper introduced the comprehensive in situ experimental methods through pre-installed facilities and pre-drilled *** properties of the surrounding rock mass,including cracks,deformation,elastic wave and micro fractures,were measured during the whole process of the tunnel *** width and characteristics of formation and evolution of tunnels EDZ were analyzed under different construction methods involving of TBM and drilling and blasting,the test tunnels were excavated by full-face or two *** relationships between EDZ and tunnel geometry sizes,overburden and excavation method were described as *** results will not only contribute a great deal to the analysis of rock mass behavior in deeply buried rock mass,but also provide direct data for support design and rockburst prediction.

关键词： deeply buried tunnel excavation damaged zone evolution characteristics in situ experiments

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Mechanical Alloying of Fe_(100-x)B_x

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Journal of Materials science & Technology 1997年第3期13卷 230-232页

作者： Lizhi CHENG Wei FENG Xinquan DONG Kuichang BAI and Kaiyuan HE (Dept. of Materials science and engineering, northeastern university shenyang 110006, China) Dept. of Materials science and engineering Northeastern University Shenyang 110006 China

The formation of nonequilibrium phase by mechanical alloying (MA) of Fe and B powders in a high energy vibration ball mill has been made for Fe100-xBx system with x=15. 30, 35, 45,55 and 70. By using the X-ray diffraction, magnetic measurement and M6ssbauer spectrummethods, it was revealed that the structure of the MA product varies with milling time and B contents.

关键词： Mechanical Alloying of Fe x)B_x

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Effect of Interfacial Bonding on the Toughening of Al_2O_3/Ni Ceramic Matrix Composites

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Journal of Materials science & Technology 1996年第1期12卷 29-34页

作者： Xudong SUN(Dept. of Materials science and engineering, northeastern university, shenyang 110006, China)J.A. Yeomans(Dept. of Materials science and engineering, university of Surrey, Guildford, Surrey GU2 5XH, UK) Dept. of Materials science and engineering Northeastern University Shenyang 110006 China Dept. of Materials science and engineering University of Surrey Guildford Surrey GU2 5XH United Kingdom

The main Iimitation to the toughening of the α-Al2O3/Ni composite is the poor bonding atthe interface. which causes the nickel particles to be pulled-out during crack propagation with-out obvious plastic deformation. A proper control of oxygen content at the Al2O3-Ni interfacecan promote wetting at the intedece, and produce a mechanically interlocked and chemically strengthened intedece, causing most of the nickel particles to be stretched to failure and to expe-rience severe plastic deformation during crack propagation in the composite. Fracture toughnesstesting using a modified double cantilever beam method with in situ observation of crack prop-agation in a scanning electron microscope shows that the composite with the strengthenedinterface has a more desirable R-curve behaviour and a higher fracture toughness value than thenormal composite.

关键词： Al Effect of Interfacial Bonding on the Toughening of Al2O3/Ni Ceramic Matrix Composites Ni

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Selective Ensemble Extreme Learning Machine Modeling of Effluent Quality in Wastewater Treatment Plants

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International Journal of Automation and computing 2012年第6期9卷 627-633页

作者： Li-Jie Zhao 1,2 Tian-You Chai 2 De-Cheng Yuan 1 1 College of information engineering,shenyang university of Chemical Technology,shenyang 110042,China 2 State Key Laboratory of Synthetical Automation for Process Industries,northeastern university,shenyang 110189,China College of information engineering Shenyang University of Chemical Technology Shenyang China State Key Laboratory of Synthetical Automation for Process Industries Northeastern University Shenyang China

Real-time and reliable measurements of the effluent quality are essential to improve operating efficiency and reduce energy consumption for the wastewater treatment *** to the low accuracy and unstable performance of the traditional effluent quality measurements,we propose a selective ensemble extreme learning machine modeling method to enhance the effluent quality *** learning machine algorithm is inserted into a selective ensemble frame as the component model since it runs much faster and provides better generalization performance than other popular learning *** extreme learning machine models overcome variations in different trials of simulations for single *** ensemble based on genetic algorithm is used to further exclude some bad components from all the available ensembles in order to reduce the computation complexity and improve the generalization *** proposed method is verified with the data from an industrial wastewater treatment plant,located in shenyang,*** results show that the proposed method has relatively stronger generalization and higher accuracy than partial least square,neural network partial least square,single extreme learning machine and ensemble extreme learning machine model.

关键词： Wastewater treatment process effluent quality prediction extreme learning machine selective ensemble model genetic algorithm.

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Terrain classification based on adaptive weights with airborne LiDAR data for mining area

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中国有色金属学会会刊：英文版 2011年第S3期21卷 648-653页

作者： LI Hui-ying1, WANG Zhi2, SUN Ya-feng1, LI Wen-hui1 1. College of Computer science and Technology, Jilin university, Changchun 130012, China 2. College of Resources and Civil engineering, northeastern university, shenyang 110004, China College of Computer science and Technology Jilin University Changchun 130012 China College of Resources and Civil engineering Northeastern University Shenyang 110004 China

The fast high-efficiency inspection for mining subsidence of mine area is a reliable way for forecasting accident and evaluating losing expense. In order to monitor mining subsidence of exploitation mine efficiently, LiDAR data were used and a novel strip division method was brought forward based on separating-treatment theory, which divided the mass of discrete three-dimensional point cloud data into a series of parallel strips and reduced the dimension in each strip. Polynomial fitting algorithm based on the adaptive weights, which located in the range of the strip, was used for classification complex terrain data of mine-area. The results show that LiDAR datamation can be greatly reduced. In the mean time, the time spending for calculation is shortened, and computational complexity is simplified. Therefore, high-efficiency terrain classification of LiDAR point cloud method can be great beneficial to monitoring environment of mine area.

关键词： mining subsidence airborne LiDAR strip division adaptive weights

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Poincaré and Poincaré-Cartan integral invariants of a generalized Hamiltonian system

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Communications in Nonlinear science and Numerical Simulation 2001年第1期6卷 45-49页

作者： Yongxin GUO, Liyan JIANG and Ying YU (Department of Physics, Liaoning university, shenyang 110026, China Department of Electronics and information engineering, Dandong Advanced Academy, Dandong 118000, China school of science, shenyang university of Te Department of Physics Liaoning University Shenyang 110036 China Dept. of Electronics and Info. Eng. Dandong Advanced Academy Dandong 118000 China school of science Shenyang University of Technology Shenyang 110023 China

Without Darboux’s transformation, the traditional Hamiltonian formulation of dynamical systems is only suitable to conservative systems or self-adjoint systems. Based on an extension of dynamic space of Birkhoffian systems to a generalized phase space by intro- ducing dummy variables, a generalized Hamiltonian canonical formulation of general systems is constructed, which admits symplectic structure. There exist integral invariants of Poincare and Poincare-Cartan’s type for such systems.

关键词： Birkhoffian systems symplectic structure integral invariants

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PRIMARY　RECRYSTALLIZATION　TEXTURES　OF　70-30　BRASS　ROLLED　BY　CROSS　SHEAR　ROLLING　IN　SINGLE　DIRECTION

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中国有色金属学会会刊：英文版 1994年第4期4卷 105-108页

作者： Zhao Xiang Liu Yansheng Xu Jiazhen Liang Zhide(Department of Materials science and engineering,northeastern university, shenyang 110006)

ＰＲＩＭＡＲＹＲＥＣＲＹＳＴＡＬＬＩＺＡＴＩＯＮＴＥＸＴＵＲＥＳＯＦ７０－３０ＢＲＡＳＳＲＯＬＬＥＤＢＹＣＲＯＳＳＳＨＥＡＲＲＯＬＬＩＮＧＩＮＳＩＮＧＬＥＤＩＲＥＣＴＩＯＮ￥ＺｈａｏＸｉａｎｇ；ＬｉｕＹａｎｓｈｅｎｇ... 详细信息

ＰＲＩＭＡＲＹＲＥＣＲＹＳＴＡＬＬＩＺＡＴＩＯＮＴＥＸＴＵＲＥＳＯＦ７０－３０ＢＲＡＳＳＲＯＬＬＥＤＢＹＣＲＯＳＳＳＨＥＡＲＲＯＬＬＩＮＧＩＮＳＩＮＧＬＥＤＩＲＥＣＴＩＯＮ￥ＺｈａｏＸｉａｎｇ；ＬｉｕＹａｎｓｈｅｎｇ；ＸｕＪｉａｚｈｅｎ；ＬｉａｎｇＺ...

关键词： cross shear rolling recrystallization texture macroscopic statistical unsymmetry three dimensional orientation distribution function

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Key technology of mine underground mobile positioning based on LiDAR and coded sequence pattern

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中国有色金属学会会刊：英文版 2011年第S3期21卷 570-576页

作者： WANG Zhi1, 2, WU Li-xin1, 2, LI Hui-ying3 1. College of Resources and Civil engineering, northeastern university, shenyang 110004, China 2. Academy of Disaster Reduction and Emergency Management, Ministry of Civil Affairs and Ministry of Education, Beijing Normal university, Beijing 100875, China 3. College of Computer science and Technology, Jilin university, Changchun 130012, China College of Resources and Civil engineering Northeastern University Shenyang 110004 China Academy of Disaster Reduction and Emergency Management Ministry of Civil Affairs and Ministry of Education Beijing Normal University Beijing 100875 China College of Computer science and Technology Jilin University Changchun 130012 China

Technologies of underground mobile positioning were proposed based on LiDAR data and coded sequence pattern landmarks for mine shafts and tunnels environment to meet the needs of fast and accurate positioning and navigation of equipments in the mine underground without satellite navigation signals. A coded sequence pattern was employed for automatic matching of 3D scans. The methods of SIFT feature, Otsu segmentation and fast hough transformation were described for the identification, positioning and interpretation of the coded sequence patterns, respectively. The POSIT model was presented for speeding up computation of the translation and rotation parameters of LiDAR point data, so as to achieve automatic 3D mapping of mine shafts and tunnels. The moving positioning experiment was applied to evaluating the accuracy of proposed pose estimation method from LiDAR scans and coded sequence pattern landmarks acquired in an indoor environment. The performance was evaluated using ground truth data of the indoor setting so as to measure derivations with six degrees of freedom.

关键词： LiDAR coded sequence pattern mobile positioning SLAM algorithm POSIT algorithm

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