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2013 International Conference on Applied Mechanics,Materials,and Manufacturing(AMMM 2013)

作者： Xuexi Chen Zhongqian Chang Qi Li Key Laboratory of Coal Mine Disaster Prevention and Control North China Institute of Science and Technology Faculty of Resources and Safety Engineering China Universitry of Mining and Technology

To develop a kind of ideal sealing material,uniform experiments were conducted in a simulation test device after the determination of material composition and approximate ratio range. The experimental data was fitted by stepwise regression analysis and optimal mixture ratio was obtained. The reliability is perfect when the ratio of foaming agent FP,foam stabilizer WP,solid filler RX and solid filler GX is 1.5:2:3:3. Field application tests show that sealing material in the above ratio has advantages of less time waste,higher reliability and better adaptability. It has a wide application prospect for fractured borehole sealing.

关键词： Three-phase foam Fractured borehole Sealing performance Material mixture ratio

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Kinetics analysis of the enzymatic hydrolysis of cellulose from straw stalk

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Acta Geochimica 2013年第1期32卷 41-46页

作者： CHEN Kun XU Longjun BI Zhiming FU Zhilei 1. State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Chongqing 400030 China 2. College of Safety Engineering Chongqing University of Science and Technology Chongqing 401331 China

The effects of several parameters on the simultaneous saccharification and fermentation of straw stalk for ethanol fuel production were investigated on the basis of orthogonal experiments. The parameters include temperature and time of fermentation, quantity and proportion of yeast inoculation, as well as cellulase dosage. An ethanol yield of 0.183 g/g was obtained from the straw stalk pretreated with diluted acid under determined optimum conditions. These conditions were: fermentation temperature: 38°C; fermentation time: 72 h; yeast inoculation quantity: 15%; yeast inoculation proportion: 2:1; and cellulose enzyme dosage: 20 U/g. The relationship between ethanol concentration c and fermentation time t is presented as follows, c=abt/(1+bt). The rate constant k of straw stalk hydrolysis by the cellulose enzyme depends on hydrolysis time, as described by k=k 1 t ?h . Therefore, straw stalk hydrolysis reaction by the cellulose enzyme is fractal-like.

关键词： fractal-like cellulase ethanol straw stalk kinetics

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Test and study of flaking mechanism of iron sulfide concretions in coal seam

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Rock Characterisation,Modelling and engineering Design Methods——The 3rd ISRM SINOROCK Symposium

作者： T.B.Zhao C.Z.Shi Y.Xu Y.C.Yin Y.L.Tan Faculty of Resources and Safety Engineering China University of Mining and Technology State Key Laboratory of Mine Disaster Prevention and Control Shandong University of Science and Technology Yanzhou Coal Mining Company Limited

ISBN: (纸本)9781138000575

Downhole testings and numerical simulations on flaking of iron sulfide concretions in different coal wall depths with different drum pick points were carried out in the study,and the flaking mechanism was *** research showed that through failure damage area with intensive cracks in the coal around the concretion was shaped under the loading of *** were four flaking types:translational flaking,rotating flaking,indentation flaking and truncation *** flaking force of concretions in different coal wall depths with different drum pick points were *** flaking force decreased with the deepening of the concretion's *** flaking force was smaller with pick point near the end than in the center of concretion.

关键词： Test and study of flaking mechanism of iron sulfide concretions in coal seam

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Analysis of main shock of thrust fault earthquake by catastrophe theory

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Applied Mathematics and Mechanics(English Edition) 2012年第7期33卷 845-864页

作者：潘岳赵志刚 College of Civil Engineering Qingdao Technological University Key Laboratory of Mine Disaster Prevention and Control Shandong University of Science and Technology

The relationship between work and energy increment of a thrust fault system with quasi-static deformation can be decomposed into two parts： volume strain energy and deviation stress energy. The relationship between work and energy increment of the deviation stress of a simplified thrust fault system is analyzed based on the catastrophe theory. The research indicates that the characteristics displayed by the fold catastrophe model can appropriately describe the condition of earthquake generation, the evolvement process of main shock of thrust fault earthquake, and some important aftershock proper- ties. The bigger the surrounding press of surrounding rock is, the bigger the maximum principal stress is, the smaller the incidences of the potential thrust fault surface are, and the smaller the ratio between the tangential stiffness of surrounding rock and the slope is, which is at the inflexion point on the softened zone of the fault shearing strength curve. Thus, when earthquake occurrs, the larger the elastic energy releasing amount of sur- rounding rock is, the bigger the earthquake magnitude is, the larger the half distance of fault dislocation is, and the larger the displacement amplitude of end face of surrounding rock is. Fracturing and expanding the fault rock body and releasing the volume strain energy of surrounding rock during the earthquake can enhance the foregoing effects to- gether.

关键词： thrust fault earthquake fold catastrophe model elastic energy releasingamount distance of fault dislocation

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Experimental apparatus study on residual strength test of fine-grained soil containing coarse

Experimental apparatus study on residual strength test of fi...

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2012 International Conference on Civil engineering and Urban Planning, CEUP

作者： Liu, Dong Chen, Xiao-Ping Yin, Sai-Hua College of Science and Engineering Jinan University Guangzhou 510632 China Key Laboratory of Disaster Forecast and Control in Engineering Jinan University Guangzhou 510632 China

ISBN: (纸本)9780784412435

Fine-grained soil containing coarse is widely distributed in the sliding zone of slop, its strength softening characteristics at large strains is different from normal clay. Special attentions are paid to residual strength of the soils for stability analysis of slop, and the most widely used shear strength test in engineering is by means of the direct shear test. However, if the soils contain a relatively high proportion of coarse particles, over 30%, it is difficult to reach a residual value by the conventional apparatus, because of the decrease in shear strength with increasing strain would at a relatively large shear displacement. The test suffers from grains overflow through the small clearance between shear-boxes and the shear plane does not remain the same. With consideration of the above disadvantages, a new type of apparatus had been developed in this paper. By controlling the tilt of the upper shear-box caused by the relative displacement of boxes under vertical force, the apparatus can meet the repeated direct shear condition at large strains. The shear apparatus has several advantages that vertical pressure applied to the specimen can be maintained, and the relatively friction between the boxes is unaltered, if required, the shear dilatation effect of specimen is freely. The experiment results demonstrated that the apparatus is applicable to the residual strength test of the fine-grained soil containing coarse. It is easy to hold the grains and maintain the only shear planes, and the shear stress-shear displacement curves obtained from the improved apparatus can reflect the strain softening characteristics well. The new apparatus have advantages of clear principle and simple structure. By simple disassembled, it can recover to the conventional direct shear apparatus. © 2012 ASCE.

关键词： Shear stress

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Multi-relaxation-time lattice Boltzmann front tracking method for two-phase flow with surface tension

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Chinese Physics B 2012年第12期21卷 310-316页

作者：谢海琼曾忠张良奇梁功有 Hiroshi Mizuseki Yoshiyuki Kawazoe Department of Engineering Mechanics Chongqing University State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Institute for Materials Research Tohoku University

In this paper, an improved incompressible multi-relaxation-time lattice Boltzmann-front tracking approach is proposed to simulate two-phase flow with a sharp interface, where the surface tension is implemented. The lattice Boltzmann method is used to simulate the incompressible flow with a stationary Eulerian grid, an additional moving Lagrangian grid is adopted to track explicitly the motion of the interface, and an indicator function is introduced to update the fluid properties accurately. The interface is represented by using a four-order Lagrange polynomial through fitting a set of discrete marker points, and then the surface tension is directly computed by using the normal vector and curvature of the interface. Two benchmark problems, including Laplace＇s law for a stationary bubble and the dispersion relation of the capillary wave between two fluids are conducted for validation. Excellent agreement is obtained between the numerical simulations and the theoretical results in the two cases.

关键词： lattice Boltzmann method multi-relaxation-time front tracking method surface ten- sion two-phase flow

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Erratum to: Precise orbit determination and accuracy analysis of HY-2A satellite using DORIS Doppler data

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Acta Geodaetica et Geophysica 2014年第4期49卷 471-471页

作者： Kong, Qiaoli Guo, Jinyun Hwang, Cheinway Gao, Fan Lin, Shinfa Zhao, Chunmei State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Qingdao China Key Laboratory of Surveying and Mapping Technology on Island and Reef State Bureau of Surveying and Mapping Qingdao China Department of Civil Engineering National Chiao Tung University Hsinchu Taiwan Institute of Geodesy and Geophysics Chinese Academy of Sciences Wuhan China Chinese Academy of Surveying and Mapping Beijing China

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Estimation of dynamic behaviors of bedrock foundation subjected to seismic loads based on FEM and DEM simulations

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KSCE Journal of Civil engineering 2013年第2期17卷 342-350页

作者： Lei Yang Yujing Jiang Bo Li Shucai Li Gang Wang Graduate School of Science and Technology Nagasaki University 852-8521 Nagasaki Japan Research Center of Geotechnical and Structural Engineering Shandong University 250061 Jinan China Faculty of Engineering Nagasaki University 852-8521 Nagasaki Japan Key Laboratory of Mine Disaster Prevention and Control Shandong University of Science and Technology 266510 Qingdao China

Seismic behavior of bedrock foundation remains as one of the most fundamental and important problems concerning the stability and safety of nuclear power plants. The dynamic FEM (Finite Element Method) is commonly utilized in analyzing the seismic responses of bedrock; while in recent decades, the DEM (Distinct Element Method) has attracted more and more attentions, which has a better capability of simulating the sliding and separation of discontinuities in dynamic simulations. In this study, the FEM and DEM were adopted to investigate the seismic behavior of the bedrock of a nuclear power plant located in Japan, and the differences between the two methods in dynamic simulations were illuminated. Simulation results using FEM and DEM models without discontinuities agree well with each other, exhibiting an amplification effect of intact bedrock on the seismic wave propagation. Numerical simulation results obtained from the models containing faults give similar responses of bedrock to the input seismic waves; however, the FEM model underestimates the weakening effect of discontinuities on the propagation of seismic waves due to that it cannot represent well the large deformational behavior of discontinuities. When large deformation happens due to large seismic loads, the DEM can be regarded as a better method in seismic response evaluations of bedrock with discontinuities.

关键词： seismic behavior earthquake bedrock foundation numerical simulation Finite Element Method (FEM) Distinct Element Method (DEM)

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Development Model of Circular Eco-Industrial Park for Comprehensive Utilization of Coal Gangue in Coal Enterprise

Development Model of Circular Eco-Industrial Park for Compre...

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国际材联2013国际先进材料大会

作者： Xiaoyuan Zhan Fang Wang Zhenqi Song Lianjun Chen Zengdi Cui College of Materials Science and Engineering Shandong University of Science and Technology State Key Laboratory Breeding Base for Mining Disaster Prevention and Control Shandong University of Science and Technology School of Resource and Earth Science China University of Mining and Technology

Development of circular economy is a certain choice for economic sustainable development, to establish a circular eco-industrial park for comprehensive utilization of coal gangue in coal enterprise is a new exploration for circular economy. In order to make vast and efficient use of existing and newly increased coal gangue to resolve the serious environmental and ecological problems, the preparation of coal gangue glued stone was investigated. The glued stone products could be used for backfill material;In order to produce the coal gangue glued stone, we heated the coal gangue in the rotary kiln, and the flue gas waste heat could be recovered and used for thermal power generation, and the power is back to the circular eco-industrial park. The mining wastewater could be used for power generation, domestic water and production water after compound purification treatment. Associated effects and synergistic effects of the different industries that integrated and connected with each other could get the double wins between the economic development and the environmental protection.

关键词： Coal enterprise,Circular economy,Eco-industrial park,Development model.

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Comparison of the hyperbolic perturbation method and the hyperbolic lindstedt-poincaré method for homoclinic solutions of self-excited systems

Comparison of the hyperbolic perturbation method and the hyp...

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2012 International Conference on Mechatronic Systems and Automation Systems, MSAS 2012

作者： Chen, Yangyang Yan, Lewei Zhao, Wei State Key Laboratory Cultivation Base of Vibration Control and Structural Safety Guangzhou University Guangzhou 510405 China Department of Engineering Mechanics Guangzhou University Guangzhou 510405 China Key Laboratory of Disaster Forecast and Control in Engineering Jinan University Guangzhou 510632 China

ISBN: (纸本)9783037854921

The comparison of the hyperbolic perturbation method and the hyperbolic Lindstedt-Poincaré method for homoclinic solutions of self-excited systems is studied in this paper. The homoclinic solution of a generalized Van del Pol system with strongly quadratic nonlinearity is analytically derived by both of the methods. The critical value of the bifurcation parameter under which homoclinic trajectory forms can be determined by the both of the perturbation procedures. Typical numerical examples are studied in detail and compared to illustrate the accuracy and the efficiency. © (2012) Trans Tech Publications, Switzerland.

关键词： Perturbation techniques

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