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Mechanical and microstructural response of densified silica glass under uniaxial compression: Atomistic simulations

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Chinese Physics B 2020年第10期29卷 507-514页

作者： Yi-Fan Xie Feng Feng Ying-Jun Li Zhi-Qiang Hu Jian-Li Shao Yong Mei School of science China University of Mining and TechnologyBeijing 100083China State Key Laboratory for Geomechanics and deep Underground Engineering China University of Mining and TechnologyBeijing 100083China State Key Laboratory of Explosion science and Technology Beijing Institute of TechnologyBeijing 100081China Institute of Defense Engineering AMSPLABeijing 100036China

We investigate the mechanical and microstructural changes of the densified silica glass under uniaxial loading-unloading via atomistic simulations with a modified BKS potential. The stress–strain relationship is found to include three respective stages: elastic, plastic and hardening regions. The bulk modulus increases with the initial densification and will undergo a rapid increase after complete densification. The yield pressure varies from 5 to 12 GPa for different densified samples. In addition, the Si–O–Si bond angle reduces during elastic deformation under compression, and 5-fold Si will increase linearly in the plastic deformation. In the hardening region, the peak splitting and the new peak are both found on the Si–Si and O–O pair radial distribution functions, where the 6-fold Si is increased. Instead, the lateral displacement of the atoms always varies linearly with strain, without evident periodic characteristic. As is expected, the samples are permanently densified after release from the plastic region, and the maximum density of recovered samples is about 2.64 g/cm^3, which contains 15 % 5-fold Si, and the Si–O–Si bond angle is less than the ordinary silica glass. All these findings are of great significance for understanding the deformation process of densified silica glass.

关键词： silica glass uniaxial compression densification atomistic simulation

Complex spherical-wave elastic inversion using amplitude and phase reflection information

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Petroleum science 2022年第3期19卷 1065-1084页

作者： Guang-Sen Cheng Xing-Yao Yin Zhao-Yun Zong Ya-Ming Yang School of Geosciences China University of Petroleum(East China)QingdaoShandong 266580China Pilot National Laboratory for Marine science and Technology(Qingdao) QingdaoShandong 266580China Shandong Provincial Key Laboratory of deep Oil and Gas QingdaoShandong 266580China

Unlike the real-valued plane wave reflection coefficient(PRC)at the pre-critical incident angles,the frequency-and depth-dependent spherical-wave reflection coefficient(SRC)is more accurate and always a complex value,which contains more reflection amplitude and phase *** near field,the imaginary part of complex SRC(phase)cannot be ignored,but it is rarely considered in seismic *** promote the practical application of spherical-wave seismic inversion,a novel spherical-wave inversion strategy is *** complex-valued spherical-wave synthetic seismograms can be obtained by using a simple harmonic superposition *** is assumed that geophone can only record the real part of complex-valued *** imaginary part can be further obtained by the Hilbert transform *** also propose the concept of complex spherical-wave elastic impedance(EI)and the complex spherical-wave EI ***,a novel complex spherical-wave EI inversion approach is proposed,which can fully use the reflection information of amplitude,phase,and *** the inverted complex spherical-wave EI,the velocities and density can be further *** data and field data examples show that the elastic parameters can be reasonably estimated,which illustrate the potential of our spherical-wave inversion approach in practical applications.

关键词： Complex seismic traces Spherical-wave theory Reflection amplitude and phase Elastic impedance Bayesian inversion

Innovative dual-mode device integrating capacitive desalination and solar vapor generation for high-efficiency seawater desalination

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Journal of Energy Chemistry 2025年第1期100卷 171-179页

作者： Jiacheng Wang Zhaoyu Chen Ruduan Yuan Jiaxin Luo Ben Zhang Keju Ji Meng Li Juanxiu Xiao Kuan Sun National Innovation Center for Industry-Education Integration of Energy Storage Technology MOE Key Laboratory of Low-grade Energy Utilization Technologies and SystemsCollege of Energy & Power Engineering Chongqing University Xuefeng Mountain Energy Equipment Safety National Observation and Research Station CQU-NUS Renewable Energy Materials & Devices Joint Laboratory Chongqing University Southwest Technology and Engineering Research Institute Jiangsu Provincial Key Laboratory of Bionic Functional Materials College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and Astronautics State Key Laboratory of Marine Resources Utilization in South China Sea Collaborative Innovation Center of Marine Science and Technology School of Marine Science and Engineering Hainan University

Solar-driven interface evaporation with high solar-to-steam conversion efficiency has shown great potential in seawater ***,due to the influence of latent heat and condensation efficiency,the water yield from solar-driven interface evaporation remains insufficient,posing a significant challenge that requires *** this work,we designed a dual-mode high-flux seawater desalination device that combines solar-driven interface evaporation and capacitive *** utilizing coupled desalination materials exhibiting both photothermal conversion and capacitance activity,the device demonstrated photothermal evaporation rates of 1.41 and 0.97 kg m-2h-1for condensate water yield under one-sun ***,the device exhibited a salt adsorption capacity of up to48 mg g-1and a salt adsorption rate of 2.1 mg *** addition,the salt adsorption capacity increased by approximately 32% under one-sun ***,photo-enhanced capacitive desalination performance was explored through numerical simulations and theoretical *** calculations and characterizations confirmed that the defect energy levels formed by the introduction of sulfur vacancies can effectively widen the light absorption range,improve photothermal conversion performance,and stimulate more photoelectrons to participate in capacitive ***,the electron distribution state of molybdenum disulfide with sulfur vacancies and surface defect sites contributes to ion/electron transport at the solid-liquid *** work provides a novel pathway for integrating solar vapor generation with other low-energy desalination technologies.

关键词： Desalination

Structure and electrochemical performance of delafossite AgFeO_(2)nanoparticles for supercapacitor electrodes

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 201-213页

作者： Choulong Veann Thongsuk Sichumsaeng Ornuma Kalawa Narong Chanlek Pinit Kidkhunthod Santi Maensiri School of Physics Institute of ScienceSuranaree University of TechnologyNakhon Ratchasima 30000Thailand SUT Center of Excellence on Advanced Functional Materials Suranaree University of TechnologyNakhon Ratchasima 30000Thailand Synchrotron Light Research Institute Nakhon Ratchasima 30000Thailand Department of Physics Universitas Negeri MalangMalang 65145Indonesia

Delafossite AgFeO_(2)nanoparticles with a mixture of 2H and 3R phases were successfully fabricated by using a simple co-precipitation *** resulting precursor was calcined at temperatures of 100,200,300,400,and 500℃to obtain the delafossite AgFe0_(2)*** morphology and microstructure of the prepared AgFeO_(2)samples were characterized by using field emission scanning electron microscopy(FESEM),transmission electron microscopy(TEM),N_(2) adsorption/desorption,X-ray absorption spectroscopy(XAS),and Xray photoelectron spectroscopy(XPS)techniques.A three-electrode system was employed to investigate the electrochemical properties of the delafossite AgFeO_(2)nanoparticles in a 3 M KOH *** delafossite AgFeO_(2)nanoparticles calcined at 100℃(AFO100)exhibited the highest surface area of 28.02 m^(2)·g^(-1)and outstanding electrochemical performance with specific capacitances of 229.71 F·g^(-1)at a current density of 1 A·g^(-1)and 358.32 F·g^(-1)at a scan rate of 2 mV·s^(-1).This sample also demonstrated the capacitance retention of 82.99% after 1000 charge/discharge cycles,along with superior specific power and specific energy values of 797.46 W·kg^(-1)and 72.74Wh·kg^(-1),*** findings indicate that delafossite AgFeO_(2)has great potential as an electrode material for supercapacitor applications.

关键词： nanoparticles delafossite electrochemical properties X-ray absorption spectroscopy co-precipitation supercapacitor

Concealed fault analysis based on the CT projection matrix

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International Journal of Mining science and Technology 2016年第2期26卷 361-367页

作者： Yang Zhen Yao Wenli Ma Liuzhu Wise Lucas School of Mines China University of Mining & Technology Key Laboratory of deep Coal Resource Mining Ministry of Education of China

This paper proposes the concept of projection curves based on the theory of CT image reconstruction to probe the internal structure of the working panel prior to formal mining of the working *** well as reducing costs,this method provides safe and efficient excavation of the working *** to the results of the numerical model and the actual working panel,the new method has been proven to be accurate in detecting the location of the fault that extends into the *** faults of the internal working panel,as well as the start and end points of the fault,can be detected by this *** practice has proven that the method is highly reliable,has a highly decisive impact on faults for coal mining,and can be used to guide the safe mining of the working panel.

关键词： Working panel Computed tomography Concealed fault Project curve

Optimal depth of in-situ pressure-preserved coring in coal seams considering roadway excavation and drilling disturbance

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Petroleum science 2024年第5期21卷 3517-3534页

作者： Peng-Fei Cui De-Lei Shang Peng Chu Ju Li Da-Li Sun Tian-Yu Wang Ming-Zhong Gao He-Ping Xie State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of deep Underground Engineering Institute of Deep Earth Sciences and Green EnergyShenzhen UniversityShenzhen518060GuangdongChina Guangdong Provincial Key Laboratory of deep Earth sciences and Geothermal Energy Exploitation and Utilization Shenzhen Key Laboratory of Deep Underground Engineering Sciences and Green EnergyCollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen518060GuangdongChina State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan UniversityChengdu610065SichuanChina School of Mechanical Engineering Sichuan UniversityChengdu610065SichuanChina Jinshi Drilltech Co. Ltd.Tangshan063004HebeiChina

Using pressure-preserved coring technique to determine in-situ gas content provides a more precise assessment of gas resource reserves and safeguard of mining safety in coal seams. How coring technique and depth affect the determination of gas content is unclear due to borehole zoning rupture caused by roadway excavation and drilling disturbance. To this end, a proposed coupling model of stress distribution and gas migration was simulated and validated by FLAC^(3D) and COMSOL Multiphysics considering superposition effects of roadway excavation and drilling disturbance. The findings indicate that the roadway surrounding rock displays distinct zoning features including stress relief zone, stress concentration zone that is composed of plastic zone, elastic zone, and original stress zone;and the broken situations depending on the borehole peeping are consistent with the corresponding simulation *** this basis, this study proposes a set of drilling coring depth calculation and prediction model for the gas desorption affected area under engineering disturbance. Optimal depth of coring drilling is not only approach to the in-situ coal bulk, but also can get the balance of the drilling workload and cost controlling. According to the typical mine site geological conditions and the numerical simulation results in this study, if the roadway excavation time is ~1 year, it is recommended that the pressure-preserved coring depth should be greater than 17 m.

关键词： In-situ fidelity coring In-situ pressure preserved coring Gas content Drilling disturbance Coring depth Excavation damage zone

Development of a pressure coring system for the investigation of deep underground exploration

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International Journal of Mining science and Technology 2023年第11期33卷 1351-1364页

作者： Da Guo Ling Chen Zhongya Zhou Dingming Wang Yiwei Zhang Xun Yang Xin Fang Xiaojun Wang Heping Lu Lin Dai Heping Xie State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of deep Underground Engineering Sichuan UniversityChengdu 610065China School of Mechanical Engineering Sichuan UniversityChengdu 610065China Guangdong Provincial Key Laboratory of deep Earth sciences and Geothermal Energy Exploitation and Utilization Institute of Deep Earth Sciences and Green EnergyCollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China Petroleum Engineering Technology Research Institute of Sinopec Jianghan Oilfield Company Wuhan 430035China

To provide a more accurate evaluation of the scale of deep underground resources,a new pressure coring system was carefully developed and its strength and safety of the engineering were verified by theoretical analyses and numerical *** designed pressure coring system can obtain cores with length of 3 m and diameter of 50 mm at 70 *** results of the ball-drop operation experiment demonstrate that differential motion assembly can effectively cut a safety pin by applying a tensile force of 4852 N,and it can lift the core tube through the center pole to complete a series of mechanical actions to seal the ***,by maintaining pressures at 70 MPa for 30 min,the pressure sealing capacity of the system was ***,a core sample with a diameter of 50 mm was obtained through a core drilling experiment and the coring performance of the pressure coring system was *** study can not only enrich the existing onshore coring technology but also provide a theoretical guide and design criteria for the development of similar pressure coring systems to meet the demand for deeper underground exploration.

关键词： Underground exploration In-situ coring Pressure coring Oil and gas production

Numerical simulation study of the failure evolution process and failure mode of surrounding rock in deep soft rock roadways

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International Journal of Mining science and Technology 2016年第2期26卷 209-221页

作者： Meng Qingbin Han Lijun Xiao Yu Li Hao Wen Shengyong Zhang Jian State Key Laboratory for Geomechanics and deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China Shandong Provincial Key Laboratory of Depositional Mineralization&Sedimentary Minerals Shangdong University of Science and TechnologyQingdao 266590China

Based on the safety coefficient method,which assigns rock failure criteria to calculate the rock mass unit,the safety coefficient contour of surrounding rock is plotted to judge the distribution form of the fractured zone in the *** will provide the basis numerical simulation to calculate the surrounding rock fractured zone in a *** the single factor and multi-factor orthogonal test method,the evolution law of roadway surrounding rock displacements,plastic zone and stress distribution under different conditions is *** reveals the roadway surrounding rock burst evolution process,and obtains five kinds of failure modes in deep soft rock *** the fuzzy mathematics clustering analysis method,the deep soft surrounding rock failure model in Zhujixi mine can be classified and patterns *** to the identification results and the results detected by geological radar of surrounding rock loose circle,the reliability of the results of the pattern recognition is verified and lays the foundations for the support design of deep soft rock roadways.

关键词： deep soft rock roadway Evolutionary process Failure model Numerical simulation Model recognition

Multi-scale variability of the tropical Indian Ocean circulation system revealed by recent observations

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science China Earth sciences 2018年第6期61卷 668-680页

作者： Ke HUANG Dongxiao WANG Weiqiang WANG Qiang XIE Ju CHEN Lingfang CHEN Gengxin CHEN State Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China Institute of deep Sea science and Engineering Chinese Academy of Sciences Sanya 572000 China Laboratory for Regional Oceanography and Numerical Modeling Qingdao National Laboratory for Marine Science and Technology Qingdao 266237 China State Key Laboratory of Marine Environmental science Xiamen University Xiamen 361005 China

The tropical Indian Ocean circulation system includes the equatorial and near-equatorial circulations, the marginal sea circulation, and eddies. The dynamic processes of these circulation systems show significant multi-scale variability associated with the Indian Monsoon and the Indian Ocean dipole. This paper summarizes the research progress over recent years on the tropical Indian Ocean circulation system based on the large-scale hydrological observations and numerical simulations by the South China Sea Institute of Oceanology(SCSIO), Chinese Academy of sciences. Results show that:(1) the wind-driven Kelvin and Rossby waves and eastern boundary-reflected Rossby waves regulate the formation and evolution of the Equatorial Undercurrent and the Equatorial Intermediate Current;(2) the equatorial wind-driven dynamics are the main factor controlling the inter-annual variability of the thermocline in the eastern Indian Ocean upwelling;(3) the equatorial waves transport large amounts of energy into the Bay of Bengal in forms of coastal Kelvin and reflected free Rossby waves. Several unresolved issues within the tropical Indian Ocean are discussed:(i) the potential effects of the momentum balance and the basin resonance on the variability of the equatorial circulation system, and(ii) the potential contribution of wind-driven dynamics to the life cycle of the eastern Indian Ocean upwelling. This paper also briefly introduces the international Indian Ocean investigation project of the SCSIO, which will advance the study of the multi-scale variability of the tropical Indian Ocean circulation system, and provide a theoretical and data basis to support marine environmental security for the countries around the Maritime Silk Road.

关键词： Equatorial undercurrent Equatorial intermediate current Eastern Indian Ocean upwelling Bay of Bengal circu lation Multi-scale variability Equatorial wave dynamics Observation and simulation