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Research on the Long Time Swelling Properties of Poly (vinyl alcohol)/Hydroxylapatite Composite Hydrogel

Journal of Bionic engineering 2009年第1期6卷 22-28页

作者： De-kun Zhang~(1,3), Da-gang Wang~2. Jun-jie Duan~(1,3), Shi-rong Ge~(2.3)1. school of Materials science and {2., china university of mining and technology, Xuzhou 2.1116, P. R. china2. school of Mechanical and Electrical {2., china university of mining and technology, Xuzhou 2.1116, P. R. china3. Biotribology Center, National Key Laboratory of Tribology, Tsinghua university, beijing 100083, P. R. china [a]school of Materials science and {2. China University of Mining and Technology Xuzhou 221116 P. R. China [b]School of Mechanical and Electrical Engineering China University of Mining and Technology Xuzhou 221116 P. R. China [c]Biotribology Center National Key Laboratory of Tribology Tsinghua University Beijing 100083 P. R. China

Poly(vinyl alcohol)/hydroxylapatite(PVA/HA)composite hydrogel was prepared by repeated freezing and *** water loss properties of the resultant hydrogel were investigated by using optical *** time immersion tests of PVA/HA composite hydrogel were carried out in the diluted calf serum solution to study the change laws of swelling properties with the freezing-thawing cycles and HA *** micro-morphologies of PVA/HA composite hydrogel after long time immersion were observed by means of the high-accuracy 3D *** results show that the swelling process of PVA/HA composite hydrogel is the converse process of its water *** time swelling ratio curves of PVA/HA composite hydrogel in the calf serum solution are manifested as four stages of quick increase,decrease,slow decrease and stable balance,and its equilibrium swelling ratio decreases with the increase of freezing-thawing cycles and HA *** is revealed that the network structure of the composite hydrogel immersed for a long period is significantly improved with the increase of HA content. Perfect network structures of PVA/HA composite hydrogel as well as full and equilibrium tissues after swelling equilibrium are obtained when the HA content is 3% and the number of freezing-thawing cycles is 7.

关键词： poly (vinyl alcohol) hydroxyapatite composite hydrogel swelling property morphology

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Field Investigation and FEM Analysis of Ground Subsidence in a Chinese Underground Gold Mine

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International Journal of Minerals,Metallurgy and Materials 2000年第1期14卷 1-4页

作者： Meifeng Cai Lan Qiao Bo Yu ChanghongLi Resources engineering school, {2. of science and technology beijing, beijing 100083 Resources engineering school University of Science and Technology Beijing Beijing 100083 China

Ground subsidence in a Chinese underground gold mine is remarkable. To find out reasons and regularities of the subsidence, following research work was carried out: (1) systemetical investigations of engineering geological conditions, including in situ stress sta- te, locstion and size of old river beds, ponds and unfilled mined-out areas, (2. in situ monitoring of strata movement by multi-point ex tensometers in 3 vertical boreholes; (3) FEM (Finite Element Method) analysis to study the relationship between the ground subsidence and {2. excavation, especially to inspect the influence of unfilled mined-out areas at shallow depth on the subsidence. Based on the research results, measures to control the ground subsidence and to prevent buildings from damage are provided.

关键词： ground subsidence mining excavation regularities influencing factors, control measures.

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Theory and techniques of data mining in CGF behavior modeling

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science china(Information sciences) 2011年第4期54卷 717-731页

作者： YIN YunFei 1,2.GONG GuangHong 2.& HAN Liang 2.1 College of Computer science,Chongqing university,Chongqing 400044,{2. 2.school of Automation science and Electrical engineering,beijing university of Aeronautics and Astronautics,beijing 100083,{2. 1. College of Computer science Chongqing University Chongqing 400044 China2. School of Automation Science and Electrical Engineering Beijing University of Aeronautics and Astronautics Beijing 100083 China

For the large quantity of data,rules and models generated in the course of computer generated forces (CGFs) behavior modeling,the common analytical methods are statistical methods based on the tactical rules,tactical doctrine and empirical ***,from the viewpoint of data mining,we can find many of these analytical methods are also each-and-every different data mining *** this paper,we survey the data mining theory and techniques that have appeared in the course of CGF behavior modeling from the viewpoint of data ***,we redefine and reclassify these theories and techniques according to the research requirements of data mining (the knowledge structure of data mining).We aim to help the CGF investigators to learn the key points and the research methods of the data intelligent processing in the CGF behavior modeling,and thus we can provide the references for the colleagues who are engaged in the research and practice of the CGF behavior modeling by this *** also introduce our ongoing work on the CGF behavior modeling based on data mining.

关键词： CGF CGF behavior modeling data mining theory and techniques

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Effect of fretting amplitudes on fretting wear behavior of steel wires in coal mines

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mining science and {2. 2010年第6期20卷 803-808页

作者： SHEN Yan, ZHANG Dekun, GE Shirong school of Materials science and {2., china university of mining & technology, Xuzhou 2.1116, china [a] school of Materials science engineering China University of Mining & Technology Xuzhou 221116 China

Given that fretting wear causes failure in steel wires, we carried out tangential fretting wear tests of steel wires on a self-made fretting wear test rig under contact loads of 9 and 2. N and fretting amplitudes ranging from 5 to 180 μm. We observed morphologies of fretted steel wire surfaces on an S-3000N scanning electron microscope in order to analyze fretting wear mecha-nisms. The results show that the fretting regime of steel wires transforms from partial slip regime into mixed fretting regime and gross slip regime with an increase in fretting amplitudes under a given contact load. In partial slip regime, the friction coefficient has a relatively low value. Four stages can be defined in mixed fretting and gross slip regimes. The fretting wear of steel wires in-creases obviously with increases in fretting amplitudes. Fretting scars present a typical morphology of annularity, showing slight damage in partial slip regime. However, wear clearly increases in mixed fretting regime where wear mechanism is a combination of plastic deformation, abrasive wear and oxidative wear. In gross slip regime, more severe degradation is present than in the other regimes. The main fretting wear mechanisms of steel wires are abrasive wear, surface fatigue and friction oxidation.

关键词： steel wires fretting wear fretting amplitude fretting regime wear mechanism

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Spatiotemporal model of open-pit based on 3-D deposit model

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中国有色金属学会会刊：英文版 2011年第S3期21卷 616-620页

作者： XIA Chun-lin1, ZHOU Hui1, LI Qing-yuan2. MA Zhen-li3 1. school of geomatics, Liaoning Technical {2., Fuxin 12.000, china 2. State Key Laboratory for GIS engineering, Chinese Academy of surveying and Mapping, beijing 100830, china 3. Yinchuan College, china university of mining and technology, Yinchuan 750011, china [a] school of geomatics Liaoning Technical University Fuxin 123000 China [b] State Key Laboratory for GIS engineering Chinese Academy of Surveying and Mapping Beijing 100830 China [c] Yinchuan College China University of Mining and Technology Yinchuan 750011 China

A new method was put forward to make up the three-dimensional deposit model, and the spatiotemporal models of open-pit with temporal dynamics were also studied combined with the corrected models of multilevel ground states so as to bring the three-dimensional open-pit model at different time and its model serial formed from the evolvement into the management of temporal dimension in order to realize the spatial three-dimension and temporal dynamic for the mining management in open-pits,which makes this model easy to query and analyze 3-D information, also help surface mining replaying and stope evolution forecasting. Finally, the time-spatial model was established to show the dynamic mining on some open-pit under the windows XP and VC++ environment.

关键词： 3D model of deposit three-dimensional model mixed model temporal model open-pit

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Numerical simulation of surface movement laws under different unconsolidated layers thickness

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中国有色金属学会会刊：英文版 2011年第S3期21卷 599-603页

作者： DAI Hua-yang1, LI Wen-chang2. LIU Yi-xin1,3, JIANG Yao-dong3 1. College of geosicence and surveying {2., china university of mining and technology, beijing 100083, china 2. College of Resources and Safety {2., china university of mining and technology, beijing 100083, china 3. College of Mechanics and Civil {2., china university of mining and technology, beijing 100083, china [a] College of geosicence and surveying {2. China University of Mining and Technology Beijing 100083 China [b] College of Resources and Safety engineering China University of Mining and Technology Beijing 100083 China [c] College of Mechanics and Civil engineering China University of Mining and Technology Beijing 100083 China

Based on specific geology and mining conditions of certain coal working face in{2., a series of numerical models under different unconsolidated layers thickness were respectively established by employing FLAC3D. The relationship between the unconsolidated layers thickness and surface movement laws was studied. Maximum surface subsidence, Maximum horizontal displacement and surface subsidence degree were obtained. Contours of surface subsidence/horizontal displacement and curves were drawn. Some laws of surface subsidence/horizontal displacement were analyzed. The role of the unconsolidated layers in surface subsidence was revealed. It is significant to predict surface subsidence of thick unconsolidated layers for coal mine and take effective measures to control surface subsidence.

关键词： unconsolidated layers surface movement numerical simulation deep mining FLAC3D

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Subsidence control and farmland conservation by solid backfilling mining technology

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中国有色金属学会会刊：英文版 2011年第S3期21卷 665-669页

作者： GUO Guang-li1, 2. FENG Wen-kai3, ZHA Jian-feng1, 2. 3, LIU Yuan-xu1, 2. WANG Qiang1, 2.1. Key Laboratory for Land Environment and Disaster Monitoring of the State Bureau of surveying and Mapping, china university of mining and technology, Xuzhou 2.1116,{2. 2. Jiangsu Key Laboratory of Resources and Environmental Information engineering, china university of mining and technology, Xuzhou 2.1116,{2. 3. State Key Laboratory of geohazard Prevention and geoenvironment Protection, Chengdu university of technology, Chengdu 610059,{2. [a] Key Laboratory for Land Environment and Disaster Monitoring of the State Bureau of surveying and Mapping China University of Mining and Technology Xuzhou 221116 China [b] Jiangsu Key Laboratory of Resources and Environmental Information engineering China University of Mining and Technology Xuzhou 221116 China [c] State Key Laboratory of geohazard Prevention and geoenvironment Protection Chengdu University of Technology Chengdu 610059 China

Solid backfilling mining technology, which decreases the height of fissure zone and caving zone, and alleviates the subsidence, is a new technology for farmland conservation. Based on the situation analysis of farmland destruction in mining area, three ways for farmland protection were proposed. In order to improve the feasibility of this technology, the limited filling materials should be used to increase resources recovery ratio, and then the surplus materials could be backfilled into goaf. An index, namely farmland conservation ability, was put forward to optimize the ways for farmland conservation. At last, the Wanbei coal mine was taken as a case for farmland conservation. It was shown that 32.0 t dull coal was substituted and 52.hm2.farmland was conserved by solid backfilling mining in this coal mine.

关键词： solid backfilling farmland conservation mining subsidence equivalent mining height

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Connectivity of the Mandelbrot set for the family of renormalization transformations

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science china Mathematics 2010年第3期53卷 849-862页

作者： WANG XiaoGuang 1,QIU WeiYuan 1 , YIN YongCheng 1 , QIAO JianYong 2.& GAO JunYang 2.1 school of Mathematical sciences, Fudan {2., Shanghai 2.0433, china 2.Center of Mathematics, china university of mining and technology, beijing 100083, china 1. school of Mathematical sciences Fudan University Shanghai 200433 China2. Center of Mathematics China University of Mining and Technology Beijing 100083 China

We show that the Mandelbrot set for the family of renormalization transformations of 2.dimensional diamond-like hierachical Potts models in statistical mechanics is connected. We also give an upper bound for the Hausd... 详细信息

关键词： connectivity Mandelbrot set renormalization transformations

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Friction-reducing and antiwear behavior of metal halide-stabilized linear phosphazene derivatives as lubricants for a steel-on-steel contact

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science china(Technological sciences) 2005年第3期48卷 282-291页

作者： ZHU Jiamei 1,2., LIU Weimin 2.& LIANG Yongmin 2.1. school of Chemical engineering and {2., china university of mining and technology, Xuzhou 2.1008, china 2. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of sciences, Lanzhou 730000, china 1. school of Chemical engineering and {2. China University of Mining and Technology 221008 Xuzhou China 2. State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences 730000 Lanzhou China

A series of novel metal halide-stabilized linear phosphazene derivatives were synthesized. The friction-reducing and antiwear abilities of the resulting products as the lubricants for a steel-on-steel contact were comparatively investigated on an Optimol SRV oscillating friction and wear tester. The morphology of the worn steel surface was observed on a scanning electron microscope, while the chemical states of some typical elements on the worn steel surface were examined by means of X-ray photoelectron spectroscopy. It was found that both the side branch structures and central metals influenced the friction-reducing and antiwear behaviors of the synthetic derivatives as the lubricants, which was related to the different adsorption activities of the organic compounds composed of different organic ingredients and metallic ions on a nascent metal surface. All the synthetic lubricants except for the iron (III) derivative showed increased antiwear abilities with increasing metallic ionic radius. A protective layer originated from the tribochemical reaction together with the adsorbed boundary lubricating layer containing organic fluorine compounds, nitrogen oxide, and Fe 3 (PO 4 ) 2.plays an important role in improving the friction and wear behavior of the steel-on-steel system.

关键词： metal halide-stabilized linear phosphazene derivatives,lubricant,steel,tribological properties.

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mining subsidence control by solid backfilling under buildings

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中国有色金属学会会刊：英文版 2011年第S3期21卷 670-674页

作者： ZHA Jian-feng1, 2. 3, GUO Guang-li1, 2. FENG Wen-kai3, WANG Qiang1, 2.1. Key Laboratory for Land Environment and Disaster Monitoring of the State Bureau of surveying and Mapping, china university of mining and technology, Xuzhou 2.1116,{2. 2. Jiangsu Key Laboratory of Resources and Environmental Information engineering, china university of mining and technology, Xuzhou 2.1116,{2. 3. State Key Laboratory of geohazard Prevention and geoenvironment Protection, Chengdu university of technology, Chengdu 610059,{2. [a] Key Laboratory for Land Environment and Disaster Monitoring of the State Bureau of surveying and Mapping China University of Mining and Technology Xuzhou 221116 China [b] Jiangsu Key Laboratory of Resources and Environmental Information engineering China University of Mining and Technology Xuzhou 221116 China [c] State Key Laboratory of geohazard Prevention and geoenvironment Protection Chengdu University of Technology Chengdu 610059 China

Solid backfilling mining can reduce the buildings' damage caused by mining greatly. The reduction of subsidence value, the slow advancing speed and the subsidence caused by backfilling body compaction are the main reasons that solid backfilling mining velocity decreases significantly. Based on the research of mechanism, some principles on subsidence control of solid backfilling mining under buildings were proposed. The equivalent mining height was designed according to the fortification criteria of buildings and their attachment structures, which enables the ground movement and deformation caused by mining to be less than the corresponding fortification criteria.

关键词： solid backfilling mining subsidence control mining under buildings

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