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| 1 | Gas diffusion in a cylindrical coal sample – A general solution,approximation and error analyses显示文摘The analytical mathematical solutions of gas concentration and fractional gas loss for the diffusion of gas in a cylindrical coal sample were given with detailed mathematical derivations by assuming that the diffusion of gas through the coal matrix is concentration gradient-driven and obeys the Fick’s Second Law of Diffusion.The analytical solutions were approximated in case of small values of time and the error analyses associated with the approximation were also undertaken.The results indicate that the square root relationship of gas release in the early stage of desorption,which is widely used to provide a simple and fast estimation of the lost gas,is the first term of the approximation,and care must be taken in using the square root relationship as a significant error might be introduced with increase in the lost time and decrease in effective diameter of a cylindrical coal sample. | Li Yaobin Xue Sheng Wang Junfeng Wang Yucang Xie Jun | 2014 | International Journal of Mining Science and Technology2014，24，1： | 12 |
| 2 | Advances in gas content based on outburst control technology in Huainan, China显示文摘The sudden and violent nature of coal and gas outbursts continues to pose a serious threat to coal mine safety in China. One of the key issues is to predict the occurrence of outbursts. Current methods that are used for predicting the outbursts in China are considered to be inadequate, inappropriate or impractical in some seam conditions. In recent years, Huainan Mining Industry Group(Huainan) in China and the Commonwealth Scientific and Industrial Research Organisation(CSIRO) in Australia have been jointly developing technology based on gas content in coal seams to predict the occurrence of outbursts in Huainan. Significant progresses in the technology development have been made, including the development of a more rapid and accurate system in determining gas content in coal seams, the invention of a sampling-while-drilling unit for fast and pointed coal sampling, and the coupling of DEM and LBM codes for advanced numerical simulation of outburst initiation and propagation. These advances are described in this paper. | Xue Sheng Yuan Liang Xie Juna Wang Yucang | 2014 | International Journal of Mining Science and Technology2014，24，3： | 10 |
| 3 | A coupled DEM and LBM model for simulation of outbursts of coal and gas显示文摘 | Sheng Xue Liang Yuan Junfeng Wang Yucang Wang Jun Xie | 2015 | International Journal of Coal Science & Technology2015，2，1： | 9 |
| 4 | Lattice Solid/Boltzmann Microscopic Model to Simulate Solid/Fluid Systems——A Tool to Study Creation of Fluid Flow Networks for Viable Deep Geothermal Energy显示文摘Realizing the potential of geothermal energy as a cheap,green,sustainable resource to provide for the planet's future energy demands that a key geophysical problem be solved first: how to develop and maintain a network of multiple fluid flow pathways for the time required to deplete the heat within a given region. We present the key components for micro-scale particle-based numerical modeling of hydraulic fracture,and fluid and heat flow in geothermal reservoirs. They are based on the latest developments of ESy S-Particle—the coupling of the lattice solid model(LSM) to simulate the nonlinear dynamics of complex solids with the lattice Boltzmann method(LBM) applied to the nonlinear dynamics of coupled fluid and heat flow in the complex solid-fluid system. The coupled LSM/LBM can be used to simulate development of fracture systems in discontinuous media,elastic stress release,fluid injection and the consequent slip at joint surfaces,and hydraulic fracturing; heat exchange between hot rocks and water within flow pathways created through hydraulic fracturing; and fluid flow through complex,narrow,compact and gouge- or powder-filled fracture and joint systems. We demonstrate the coupled LSM/LBM to simulate the fundamental processes listed above,which are all components for the generation and sustainability of the hot-fractured rock geothermal energy fracture systems required to exploit this new green-energy resource. | Peter Mora Yucang Wang Fernando Alonso-Marroquin | 2015 | Journal of Earth Science2015，26，1： | 5 |
| 5 | A general solution and approximation for the diffusion of gas in a spherical coal sample显示文摘The square root relationship of gas release in the early stage of desorption is widely used to provide a simple and fast estimation of the lost gas in coal mines. However, questions arise as to how the relationship was theoretically derived, what are the assumptions and applicable conditions and how large the error will be. In this paper, the analytical solutions of gas concentration and fractional gas loss for the diffusion of gas in a spherical coal sample were given with detailed mathematical derivations based on the diffusion equation. The analytical solutions were approximated in case of small values of time and the error analyses associated with the approximation were also undertaken. The results indicate that the square root relationship of gas release is the first term of the approximation, and care must be taken in using the square root relationship as a significant error might be introduced with increase in the lost time and decrease in effective diameter of a spherical coal sample. | Wang Yucang Xue Sheng Xie Jun | 2014 | International Journal of Mining Science and Technology2014，24，3： | 4 |
| 6 | The Experimental Simulation of Rocks on Load/Unload Response Ratio for Earthquake Prediction显示文摘The load/unload experiments on rock failure under pressure have been carried out in Material Test System (MTS) in the Laboratory for Non-linear Mechanics of Continuous Media (LNM), Institute of Mechanics, Chinese Academy of Sciences, and load/unload response ratio (LURR) values with strain as response (i.e. inverse elastic constant as response rate) have been obtained. The experimental results are in accordance with theoretical results and those in real earthquakes: LURR rises just before rock failure. So LURR can be used as the precursor of rock failure and earthquake prediction. | Wang Yucang, Yin Xiangchu, and Wang HaitaoLaboratory for Non-linear Mechanics of Continuous Media (LNM), Institute of Mechanics,Chinese Academy of Sciences, Beijing 100080, ChinaLaboratory for Non-linear Mechanics of Continuous Media (LNM), Institute of Mechanics,Chinese Academy of Sciences, Beijing 100080, ChinaCenter for Analysis and Prediction , CSB, Beijing 100036, China | 1998 | Earthquake Research in China1998，12，4： | 3 |
| 7 | TiO2-incorporated polyelectrolyte composite membrane with transformable hydrophilicity/hydrophobicity for nanofiltration separation显示文摘The wettability of the membrane surface has shown obvious influent on the separation performance of the membrane.In this work,a hydrophilic PDA-[PDDA/TiO2]+Cl-membrane was prepared by a one-step codeposition of poly(diallyldimethylammonium chloride)(PDDA)polyelectrolyte solution containing positively charged TiO2@PDDA nanoparticles with the assistance of dopamine(DA).Such positively charged membrane can be transformed into a hydrophobic membrane PDA-[PDDA/TiO2]+PFO-via the counterion exchange between Cl-and PFO-(perfluorooctanoate).The transformation between hydrophilicity and hydrophobicity is reversible.For both hydrophilic and hydrophobic membranes,the nanofiltration performances were respectively investigated by the aqueous solution and ethanol solution of dyes including methyl blue(MB),Congo red(CR)and Evans blue(EB),and as well metal salt aqueous solution.The consecutive running stability and anti-fouling performance of both hydrophilic and hydrophobic membranes were explored.The results revealed that both membranes showed high nanofiltration performances for retention of dyes in(non)aqueous solution.For the hydrophilic membrane,the rejection of salts in a sequence is MgSO4>Na2SO4>MgCl2>NaCl.Moreover,both of the hydrophilic and hydrophobic membranes showed high stability and antifouling property. | Yahua Lu Zhenping Qin Naixin Wang Hongxia Guo Quanfu An Yucang Liang | 2020 | Chinese Journal of Chemical Engineering2020，28，10： | 2 |
| 8 | Development of a New Approach to Earthquake Prediction-Load/unload Response Ratio(LURR) Theory显示文摘 | Xiang-chu YIN Yucang WANG Keyin PANG | 2000 | Pure Appl Geophys2000，157，： | 1 |
| 9 | Development of a new approach to earthquake prediction Load/Unload Response Ratio (LURR) theory 显示文摘 | Yin Xiangchu Chen Xuezhong Wang Yucang | 2000 | Pure and Applied Geophysics2000，157，1112： | 1 |
| 10 | LURR’s Twenty Years and its Perspective显示文摘 | Xiang-Chu Yin Lang-Ping Zhang Hui-Hui Zhang Can Yin Yucang Wang Yongxian Zhang Keyin Peng Haitao Wang Zhiping Song Huaizhong Yu Jiancang Zhuang | 2006 | Pure and Applied Geophysics (-)2006，，11： | 1 |
| 11 | Revisiting rolling and sliding in two-dimensional discrete element models显示文摘It has long been recognized that the rotation of single particles plays a very important role in simulations of granular flow using the discrete element method(DEM).Many researchers have also pointed out that the effect of rolling resistance at the contact points should be taken into account in DEM simulations.However,even for the simplest case involving two-dimensional circular particles,there is no agreement on the best way to define rolling and sliding,and different definitions and calculations of rolling and sliding have been proposed.It has even been suggested that a unique rolling and sliding definition is not possible.In this paper we assess results from previous studies on rolling and sliding in discrete element models and find that some researchers have overlooked the effect of particles of different sizes.After considering the particle radius in the derivation of rolling velocity,all results reach the same outcome:a unique solution.We also present a clear and simple derivation and validate our result using cases of rolling.Such a decomposition of relative motion is objective,or independent of the reference frame in which the relative motion is measured. | Yucang Wang Fernando Alonso-Marroquin Sheng Xue Jun Xie | 2015 | Particuology2015，13，1： | 1 |
| 12 | Calibration of discrete element modeling: Scaling laws and dimensionless analysis显示文摘In this paper,dynamic similarity conditions are derived for discrete element simulations by non-dimensionalising the governing equations.These conditions must be satisfied so that the numerical model is a good representation of the physical phenomenon.For a pure mechanical system,if three independent ratios of the corresponding quantities between the two models are set,then the ratios of other quantities must be chosen according to the similarity principles.The scalability of linear and non-linear contact laws is also investigated.Numerical tests of 3D uni-axial compression are carried out to verify the theoretical results.Another example is presented to show how to calibrate the model according to laboratory data and similarity conditions.However,it is impossible to reduce computer time by scaling up or down certain parameters and continue to uphold the similarity conditions.The results in this paper provide guidelines to assist discrete element modelers in setting up the model parameters in a physically meaningful way. | Yucang Wang Peter Mora Yunpei Liang | 2022 | Particuology2022，20，3： | 1 |
| 13 | Characters of variation of LURR during the earthquake sequence of Xinjiang显示文摘The theory of the loading/unloading response ratio (LURR) was applied to the Jiashi earthquake sequence which occurred at the beginning of 1997 in Xinjiang, and found that, before the earthquakes with relatively high magnitudes in the sequence, the ratio showed anomalies of high values. That is to say, the LURR theory can be applied to the short_term earthquake prediction in some cases, especially in the early period after a strong earthquake, such as the forecasts for some strong earthquakes in the Jiashi sequence. | Haitao Wang Keyin Peng Yongxian Zhang Yucang Wang Xiangchu Yin | 1998 | Chinese Science Bulletin1998，43，20： | 1 |
| 14 | Rolling and sliding in 3-D discrete element models显示文摘 | Yucang Wang Fernando Alonso-Marroquin William W. Guo | 2015 | Particuology2015，13，6： | 1 |
| 15 | Gas diffusion in a cylindrical coal sample – A general solution, approximation and error analyses显示文摘 | Yaobin Li Sheng Xue Junfeng Wang Yucang Wang Jun Xie | 2013 | International Journal of Mining Science and Technology2013，，： | 1 |
| 16 | Numerical Modeling of Porous Flow in Fractured Rock and Its Applications in Geothermal Energy Extraction显示文摘Understanding the characteristics of hydraulic fracture,porous flow and heat transfer in fractured rock is critical for geothermal power generation applications,and numerical simulation can provide a powerful approach for systematically and thoroughly investigating these problems. In this paper,we present a fully coupled solid-fluid code using discrete element method(DEM) and lattice Boltzmann method(LBM). The DEM with bonded particles is used to model the deformation and fracture in solid,while the LBM is used to model the fluid flow. The two methods are two-way coupled,i.e.,the solid part provides a moving boundary condition and transfers momentum to fluid,while the fluid exerts a dragging force to the solid. Two widely used open source codes,the ESy S_Particle and the OpenL B,are integrated into one code and paralleled with Message Passing Interface(MPI) library. Some preliminary 2D simulations,including particles moving in a fluid and hydraulic fracturing induced by injection of fluid into a borehole,are carried out to validate the integrated code. The preliminary results indicate that the new code is capable of reproducing the basic features of hydraulic fracture and thus offers a promising tool for multiscale simulation of porous flow and heat transfer in fractured rock. | Yucang Wang Shimin Wang Sheng Xue Deepak Adhikary | 2015 | Journal of Earth Science2015，26，1： | 0 |
| 17 | Acetyl-L-carnitine protects adipose-derived stem cells exposed to H2O2 through regulating AMBRA1-related autophagy显示文摘The cell activity of adipose-derived stem cells(ADSCs)is affected by the intracellular reactive oxygen species(ROS)and the level of autophagy.Previous studies reveal that acetyl-L-carnitine(ALC)possesses capacities of resisting oxidative stress and regulating autophagy.Activating molecule in Beclin1-regulated autophagy protein 1(AMBRA1)plays a key role in initiating Beclin1-regulated autophagy.In the present study,we discovered ALC pretreatment(1 mM,24 h)significantly increased the activity of ADSCs exposed to H_(2)O_(2)(100μM,2 h)in vitro with improved stemness,and reduced the production of intracellular ROS.In addition,we found for the first time that ALC treatment up-regulated autophagy of ADSCs through strengthening the expressions of Beclin1 and AMBRA1 synchronously,which might be involved in the protective effect of ALC. | YAO QIAN JINGPING WANG ZIWAN JI HAO CHEN YUCANG HE XULING LV ZIKAI ZHANG TIAN LI TIANYUN PAN LIQUN LI MING LIN | 2021 | BIOCELL2021，45，1： | 0 |
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