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Science China(Technological Sciences) 2022年第2期65卷 261-271页

作者： li shuchen NIU Shengli HAN KuiHua li YingJie WANG YongZheng LU ChunMei Shandong Engineering Laboratory for High-efficiency Energy Conservation and Energy Storage Technology&Equipment School of Energy and PoweringShandong UniversityJinan 250061China

The co-combustion characteristics of oily sludge and ginkgo leaves(GL) in an oxy-fuel atmosphere are investigated via thermogravimetric analysis coupled with an artificial neural network. The combustion characteristics of blends improve as the GL mass ratio increases. The interaction indices used to evaluate the interaction between the two solid combustibles present a complex nonlinear relationship in different stages. The Flynn-Wall-Ozawa and Kissinger-Akahira-Sunose methods are used to calculate the activation energy of the blends, which increases with an increase in the oxygen concentration, in different atmospheres. Compared with the radial basis function, the backpropagation neural network performs better in predicting the combustion curve of the blends.

关键词： oily sludge co-combustion oxy-fuel atmosphere thermogravimetric analysis artificial neural network

Nonlinear Flow Properties of Newtonian Fluids through Rough Crossed Fractures

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Computer Modeling in Engineering & Sciences 2023年第8期136卷 1427-1440页

作者： Zhenguo liu shuchen li Richeng liu Changzhou Zheng Geotechnical and Structural Engineering Research Center Shandong UniversityJinan250061China Sinohydro Foundation Engineering Co. Ltd.Tianjin301700China State Key Laboratory for Geomechanics andDeepUnderground Engineering China University of Mining and TechnologyXuzhou221116China

The nonlinear flow properties of Newtonian fluids through crossed fractures are estimated by considering the influences of length,aperture,and surface roughness of fractures.A total of 252 computational runs are performed by creating 36 computational domains,in which the Navier-Stokes equations are *** results show that the nonlinear relationship between flow rate and hydraulic gradient follows Forchheimer’s law–based *** the hydraulic gradient is small(i.e.,10^(−6)),the streamlines are parallel to the fracture walls,indicating a linear streamline *** the hydraulic gradient is large(i.e.,10^(0)),the streamlines are disturbed by a certain number of eddies,indicating a nonlinear streamline *** patterns of eddy distributions depend on the length,aperture,and surface roughness of *** the increment of hydraulic gradient from 10^(−6) to 10^(0),the ratio of flow rate to hydraulic gradient holds constants and then decreases slightly and finally decreases *** fluid flow experiences a linear flow regime,a weakly nonlinear regime,and a strongly nonlinear regime,*** critical hydraulic gradient ranges from 3.27×10^(−5) to 5.82×10^(−2) when fracture length=20–100mmandmechanical aperture=1–*** joint roughness coefficient plays a negligible role in the variations in critical hydraulic gradient compared with fracture length and/or mechanical *** critical hydraulic gradient decreases with increasing mechanical aperture,following power-law *** parameters in the functions are associated with fracture length.

关键词： Crossed fractures surface roughness aperture nonlinear flow critical hydraulic gradient

Estimates of strength and cracking behaviors of pre-flawed granite specimens treated by chemical corrosion under triaxial compression tests

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Frontiers of Earth Science 2022年第2期16卷 411-434页

作者： Zhicong li Richeng liU shuchen li Hongwen JING Xiaozhao li liyuan YU State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China

Four types of granite specimens were prepared and treated by chemical corrosion for 5 and 30 days,which were then used to carry out triaxial compression tests under different confining pressuresσ_(3).Type A is the intact sample with no preexisting *** B and C are the samples containing two relatively low-dip flaws and two relatively high-dip flaws,*** D is the sample including both relatively low-dip and relatively high-dip *** influences of pH value of chemical solutions,flaw distribution,corrosion time andσ_(3) on triaxial stress-strain curves and ultimate failure modes are analyzed and *** results show that the pH value of the chemical solution,corrosion time and the arrangement of preexisting flaws play crucial roles in the cracking behaviors of granite *** A specimens have the largest peak axial deviatoric stress,followed by Type C,Type D,and Type B specimens,*** is because the decrease in the inclination of preexisting flaws induces the weakening effect due to the decrease in the shadow area along the compaction *** aσ_(3) of 5 MPa,the peak axial deviatoric stress drops by approximately 40.89%,29.08%,4.08%,and 23.53%for pH=2,4,7,and 12,*** intact granite(Type A)specimens,the ultimate failure mode displays a typical shear *** connection of two secondary cracks initiated at the tips of preexisting cracks is always the ultimate failure and crack coalescence mode for Type B *** ultimate failure and crack coalescence mode of Types C and D specimens are significantly affected by pH value of the chemical solution,corrosion time andσ_(3),which is different from those of Types A and B specimens due to the differences in flow distributions.

关键词： granites preexisting flaws chemical corrosion triaxial compression strength cracking behavior

Comparative analysis of thermodynamic and mechanical responses between underground hydrogen storage and compressed air energy storage in lined rock caverns

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International Journal of Mining Science and Technology 2024年第4期34卷 531-543页

作者： Bowen Hu liyuan Yu Xianzhen Mi Fei Xu shuchen li Wei li Chao Wei Tao Zhang State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China Key Laboratory of Large Structure Health Monitoring and Control Shijiazhuang Tiedao UniversityShijiazhuang 050043China School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhou 221116China

Underground hydrogen storage(UHS)and compressed air energy storage(CAES)are two viable largescale energy storage technologies for mitigating the intermittency of wind and solar ***,it is meaningful to compare the properties of hydrogen and air with typical thermodynamic storage *** study employs a multi-physical coupling model to compare the operations of CAES and UHS,integrating gas thermodynamics within caverns,thermal conduction,and mechanical deformation around rock *** thermodynamic responses are validated using additional simulations and the field test *** and pressure variations of air and hydrogen within rock caverns exhibit similarities under both adiabatic and diabatic simulation *** reaches higher temperature and pressure following gas charging stage compared to air,and the ideal gas assumption may lead to overestimation of gas temperature and *** steel lining of CAES,the sealing layer(fibre-reinforced plastic FRP)in UHS is prone to deformation but can effectively mitigates stress in the sealing *** CAES,the first principal stress on the surface of the sealing layer and concrete lining is tensile stress,whereas UHS exhibits compressive stress in the same *** present research can provide references for the selection of energy storage methods.

关键词： Underground hydrogen storage Compressed air energy storage Mechanical response Thermodynamic response lined rock caverns

Empirical prediction of hydraulic aperture of 2D rough fractures:a systematic numerical study

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Frontiers of Earth Science 2024年第3期18卷 579-597页

作者： Xiaolin WANG shuchen li Richeng liU Xinjie ZHU Minghui HU State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China

This study aims to propose an empirical prediction model of hydraulic aperture of 2D rough fractures through numerical simulations by considering the influences of fracture length,average mechanical aperture,minimum mechanical aperture,joint roughness coefficient(JRC)and hydraulic *** generate 600 numerical models using successive random additions(SRA)algorithm and for each model,seven hydraulic gradients spanning from 2.5×10^(-7)to 1 are considered to fully cover both linear and nonlinear flow *** a result,a total of 4200 fluid flow cases are simulated,which can provide sufficient data for the prediction of hydraulic *** results show that as the ratio of average mechanical aperture to fracture length increases from 0.01 to 0.2,the hydraulic aperture increases following logarithm *** the hydraulic gradient increases from 2.5×10^(-7)to 1,the hydraulic aperture decreases following logarithm *** a relatively low hydraulic gradient(i.e.,5×10^(-7))is applied between the inlet and the outlet boundaries,the streamlines are of parallel distribution within the ***,when a relatively large hydraulic gradient(i.e.,0.5)is applied between the inlet and the outlet boundaries,the streamlines are disturbed and a number of eddies are *** hydraulic aperture predicted using the proposed empirical functions agree well with the calculated results and is more reliable than those available in the preceding *** practice,the hydraulic aperture can be calculated as a first-order estimation using the proposed prediction model when the associated parameters are given.

关键词： fluid flow rough fracture surface mechanical aperture hydraulic aperture predictive model

A first-principles study of helium diffusion in quartz and coesite under high pressure up to 12GPa

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Geoscience Frontiers 2021年第2期12卷 1001-1009页

作者： Hong liu lingling Wang shuchen li Yaochun Yang Hua Tian Fengxia Sun Chaowen Xu Lei liu Yi li Yueju Cui Ying li Jijun Zhao United Laboratory of High-Pressure Physics and Earthquake Science Key Laboratory of Earthquake PredictionInstitute of Earthquake ForecastingCEABeijing 100036China Key Laboratory of Materials Modification by Laser Ion and Electron Beams(Dalian University of Technology)Ministry of EducationDalian 116024China College of Information Engineering and Computer Science(Tai Yuan University of Technology) Taiyuan 030024China

Helium diffusion in mantle minerals is crucial for understanding mantle structure and the dynamic processes of Earth's *** this paper,we report helium incorporation and the mechanism of its diffusion in perfect crystals of quartz and *** diffusion pathways,activation energies(Ea),and frequency factors of helium under ambient and high pressure conditions were calculated using Density Functional Theory(DFT)and the climbing image nudged elastic band(CI-NEB)*** calculated diffusive coefficients of He in the quartz in different orientations are:D[100]=1.24×10^(−6)exp.(−26.83 kJ/mol/RT)m^(2)/s D[010]=1.11×10^(−6)exp.(−31.60 kJ/mol/RT)m^(2)/*** in the coesite:D[100]=3.00×10^(−7)exp.(−33.79 kJ/mol/RT)m^(2)/s D[001]=2.21×10^(−6)exp.(−18.33 kJ/mol/RT)m^(2)/*** calculated results indicate that diffusivity of helium is anisotropic in both quartz and coesite and that the degree of anisotropy is much more pronounced in *** diffusion behavior in coesite under high pressures was *** activation energies increased with pressure:Ea[100]increased from 33.79 kJ/mol to 58.36 kJ/mol,and Ea[001]increased from 18.33 kJ/mol to 48.87 kJ/mol as pressure increased from0 GPa to 12 *** calculations showed that helium is not be quantitatively retained in silica at typical surface temperatures on Earth,which is consistent with the findings from previous *** results have implications for discussion of the Earth's mantle evolution and for recognition thermal histories of ultra-high pressure(UHP)metamorphic terranes.

关键词： Helium Diffusion Quartz Coesite High pressure

Icaritin inhibits the progression of urothelial cancer by suppressing PADI2-mediated neutrophil infiltration and neutrophil extracellular trap formation

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Acta Pharmaceutica Sinica B 2024年第9期14卷 3916-3930页

作者： Zezhong Mou Yiling Chen Jinzhong Hu Yun Hu Lujia Zou Xinan Chen Shenghua liu Qiuping Yin Jian Gong shuchen li Shanhua Mao Chenyang Xu Haowen Jiang Department of Urology Huashan HospitalFudan UniversityShanghai 200040China Fudan Institute of Urology Fudan UniversityShanghai 200040China National Clinical Research Center for Aging and Medicine Fudan UniversityShanghai 200040China

Tumor relapse and metastasis are the major causes of mortality associated with urothelial *** the tumor microenvironment,negative regulatory molecules and various immune cell subtypes suppress antitumor *** inflammatory microenvironment,associated with neutrophils and neutrophil extracellular traps(NETs),promotes tumor ***,no drugs are currently available to specifically inhibit neutrophils and *** this study,we first demonstrated that icaritin(ICT),a Chinese herbal remedy that is a first-line treatment for advanced and incurable hepatocellular carcinoma,reduces NETs caused by suicidal NETosis and prevents neutrophil infiltration in the tumor ***,ICT binds to and inhibits the expression of PADI2 in neutrophils,thereby suppressing PADI2-mediated histone ***,ICT inhibits ROS generation,suppresses the MAPK signaling pathway,and inhibits NET-induced tumor ***,ICT inhibits tumoral PADI2-mediated histone citrullination,which consequently suppresses the transcription of neutrophil-recruiting genes such as GM-CSF and *** downregulation of IL-6 expression,in turn,forms a regulatory feedback loop through the JAK2/STAT3/IL-6 *** a retrospective study of clinical samples,we found a correlation between neutrophils,NETs,UCa prognosis,and immune *** ICT with immune checkpoint inhibitors may have synergistic *** summary,our study demonstrated that ICT could be a novel inhibitor of NETs and a novel UCa treatment.

关键词： Icaritin Neutrophil Neutrophil extracellular trap PADI2 Urothelial cancer

STATISTICAL EVALUATION OF CRITICAL INCLUSION FACTOR FOR SECONDARY RECRYSTALliZATON IN 3%Si STEEL Lecturer,Department of Materials Engineering,Southwestern Jiaotong University,Chengdu 610031,China

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Acta Metallurgica Sinica(English Letters) 1990年第5期3卷 327-331页

作者： li shuchen Southwestern Jiaotong University,Chengdu,ChinaCHEN Mengzhe KE Jun University of Science and Technology Beijing,Beijing,China

On the basis of statistical data of MnS in the conventional 3% Si steel sheeets after various annealing processes,the critical inclusion factor has been evaluated to be 20 mm^(-1).The inhi- bition of MnS to grain grow... 详细信息

关键词： 3%Si steel secondary recrystallization inclusion factor

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深部岩体工程围岩分区破裂化现象研究综述

岩石力学与工程学报 2008年第6期27卷 1278-1284页

作者：钱七虎李树忱解放军理工大学工程兵工程学院江苏南京210007

随着经济建设与国防建设的不断发展,深部岩体工程越来越多,如逾千米乃至数千米的矿山(如金川镍矿和南非金矿等)、锦屏二级引水隧洞及辅助洞、核废料的深层地下存储、深部地下防护工程等。深部岩体工程在开挖洞室或巷道时,围岩变形和破... 详细信息

随着经济建设与国防建设的不断发展,深部岩体工程越来越多,如逾千米乃至数千米的矿山(如金川镍矿和南非金矿等)、锦屏二级引水隧洞及辅助洞、核废料的深层地下存储、深部地下防护工程等。深部岩体工程在开挖洞室或巷道时,围岩变形和破坏等出现了一系列新的科学现象。除了岩爆和围岩挤压大变形以外,围岩的分区破裂化现象也吸引了很多岩石力学工作者的关注。基于国外对分区破裂化现象的实验和理论研究,归纳出分区破裂化现象的主要特征参数及其变化规律,揭示分区破裂化现象产生的条件;提出这一领域的研究方向;同时介绍国内在该领域实验和理论方面的研究进展。

关键词：岩石力学深部岩体分区破裂化非线性岩石力学动力问题岩爆

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试论经济犯罪之心理结构特征

理论前沿 2006年第12期 20-21页

作者：李殊辰北京市海淀区人民政府

从认识、需要、意志、语言四个方面对经济犯罪的心理结构特征进行分析、探讨,对于揭示经济犯罪心理发展的规律和特点,有效预防犯罪、揭露犯罪具有重要意义。

关键词：经济犯罪心理结构特征