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Pseudo-dynamic viscoelastic stability analysis of anti-dip bedding rock slopes

Journal of Rock Mechanics and Geotechnical engineering 2025年第3期17卷 1631-1645页

作者： Shixin Zhang Yufeng Wei Yanling Liu Chunyu Chen Hao Yang Xin Zhang Peng Liang State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu610059China College of Environment and Civil Engineering Chengdu University of TechnologyChengdu610059China PowerChina Northwest Engineering Corporation Limited Xi'an710000China

Earthquakes contribute to the failure of anti-dip bedding rock slopes(ABRSs)in seismically active *** pseudo-static method is commonly employed to assess the ABRSs ***,simplifying seismic effects as static loads often underestimates rock slope *** development of a practical stability analysis approach for ABRSs,particularly in slope engineering design,is *** study proposes a stability evaluation model for ABRSs,incorporating the viscoelastic properties of rock,to quantitatively assess the safety factor and failure surface under seismic *** mathematical description of the pseudo-dynamic method,derived in this study,accounts for the viscoelastic properties of ABRSs and integrates the HoekeBrown failure criterion with the Kelvin-Voigt stress-strain relationship of ***,to address concurrent translation-rotation failure in ABRSs,upper bound limit analysis is utilized to quantify the safety *** a comparison with existing literature,the proposed method considers the effect of harmonic vibration on the stability of *** obtained safety factor is lower than that of the quasi-static method,with the resulting percentage change exceeding 5%.The critical failure surface demonstrates superior positional accuracy compared to the Aydan and Adhikary basal planes,with minimal error observed between the physical model test and the numerical simulation *** parameter sensitivity analysis reveals that the inclination of ABRSs exhibits the highest sensitivity(Sk)value across the three levels of horizontal seismic coefficient(kh).The study aims to devise an expeditious calculation approach for assessing the stability of ABRSs during seismic events,intending to offer theoretical guidance for their stability analysis.

关键词： Anti-dip bedding rock slope Viscoelastic properties Pseudo-dynamic method Upper bound limit analysis Kelvin-voigt model

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Use of forestry waste as an alternative raw material for generating metallurgical coke

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Journal of Iron and Steel Research International 2025年第1期32卷 25-39页

作者： Lin-bo Qin Wei Qin An-yi Wang Ling Shi Jun Han College of Resources and Environment Engineering Wuhan University of Science and TechnologyWuhan430081HubeiChina Hubei Key Laboratory of Industrial Fume and Dust Pollution Control Jianghan UniversityWuhan430056HubeiChina Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources Wuhan University of Science and TechnologyWuhan430081HubeiChina

Forestry waste(FW)is a significant renewable energy source in *** substitution of coal blends(BC)with forestry waste to produce metallurgical coke was investigated aiming at expanding alternative resources and reducing CO_(2)emissions in ironmaking *** BC with different ratios of FW were carbonized in a fixed bed reactor,and the physicochemical structure of the coke derived from FW/BC co-carbonization was characterized by Fourier transform infrared spectroscopy,X-ray photoelectron spectroscopy,solid-state^(13)C nuclear magnetic resonance,optical microscopy,and scanning electron *** results reveal that the suitable incorporation of FW in BC is 10 wt.%,and the index of coke quality exhibits a good correlation with the optical anisotropy index and the aromaticity of the as-obtained *** partial substitution of BC with FW exhibits potential benefits for colloid formation,owing to the higher hydrogen in ***,as the substitution ratio of BC with FW increases,it inhibits coke agglomeration due to more tortuous stacked structures formation during volatile releasing ***,it was identified that the substitution of higher BC ratios with FW results in the partial replacement of aromatic carbons by oxygenlinked carbons and aliphatic *** substitution leads to a reduction in the aromaticity of the as-obtained coke.

关键词： Metallurgical coke Forestry waste Coal blend Co-carbonization Chemical structure

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Stereoselective effects and its potential mechanism of ofloxacin on the growth and development of Rana nigromaculata:mainly liver lipid metabolism

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Frontiers of environmental Science & engineering 2025年第4期19卷 125-138页

作者： Wenjun Zhang Miaomiao Teng Jin Yan Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes of Ministry of Education College of EnvironmentHohai UniversityNanjing 210098China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology School of Environmental Science and EngineeringSuzhou University of Science and TechnologySuzhou 215009China

Most research on antibiotics in the environment disregards chiral antibiotics,such as ofloxacin(OF).In this study,tadpoles of Rana nigromaculata were exposed to 1μg/L OF and levofloxacin(LVFX,an enantiomer of OF)for 75 *** with dextrofloxacin,LVFX treatment had a greater effect on the inhibition of bodyweight,body length,development stage,and pathological liver ***,OF exerts a stereoselective inhibitory effect on both growth and development,which is consistent with the results at the systemic metabolism *** analysis revealed that the differentially expressed genes between OF and LVFX were mainly immune *** metabolomics showed that the stereoselective biological effect of OF on *** was caused by differences in contents of PE-O 16:0-22:4,PE 16:0-14:0,TAG 45:0-FA16:0,PE-P 18:0-16:0,PE 16:0-16:0,PC 16:0-22:4+AcO,PE 18:1-18:3,PC 16:1-18:1+AcO,and PC 18:1-18:3+***,two enantiomers of OF were selectively bound to enzymes related to lipid *** study provides both theoretical and practical references for the accurate evaluation and scientific control of the ecological risk of chiral antibiotics.

关键词： Chiral antibiotics Amphibians Targeted metabolomics Molecular docking Obesity

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Comparative Study of Proton and Heavy Ion-induced Damages for GaN-based HEMTs 24

Comparative Study of Proton and Heavy Ion-induced Damages fo...

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8th International Conference on Electronic Information technology and Computer engineering, EITCE 2024

作者： Wu, Zhipeng Huang, Huixiang Yang, Jianqun Lei, Zhifeng Cui, Xiuhai Ma, Teng Peng, Chao School of Opto-electronic and Communication Engineering Xiamen University of Technology Fujian Xiamen China National Key Laboratory of Material Behavior and Evaluation Technology in Space Environment Harbin Institute of Technology Heilongjiang Harbin China Science and Technology on Reliability Physics and Application of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangdong Guangzhou China

ISBN: (纸本)9798400710094

The variations of the radiation damage induced by radiation from protons and heavy ions on Cascode GaN HEMTs are comparatively studied. 300 MeV proton and 500 MeV heavy ion irradiation are carried out for AlGaN/GaN HEMTs. Findings from the study indicate that exposure to a proton flux of 300 MeV, reaching a cumulative level of 1×1011 cm-2, leads to a reduction in the output current. Concurrently, there is a downward adjustment of 0.27 volts in the turn-on voltage, along with a 5.59% decline in the peak transconductance. Following irradiation, the creation of traps within the device’s channel layer results in a decline in its electrical efficiency. Under 500 MeV heavy ion irradiation with a total fluence of 3.167×105cm-2, a significant leakage current increase is observed when a drain bias of 100 volts is applied. An enhancement in the output current is observed, accompanied by a 0.11V downward adjustment in the voltage at which the channel forms and a significant 70.17% diminution in peak transconductance. Additionally, instances of single event burnout (SEB) are detectable when the drain bias exceeds 150 V. © 2024 Copyright held by the owner/author(s).

关键词： Gallium nitride

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Prediction of time-energy-location of microseismic events induced by deep coal-energy mining:Deep learning approach

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Journal of Rock Mechanics and Geotechnical engineering 2025年第1期17卷 233-244页

作者： Yue Song Enyuan Wang Hengze Yang Dong Chen Baolin Li Yangyang Di School of Safety Engineering China University of Mining and TechnologyXuzhou221116China State Key Laboratory of Coal Mine Disaster Prevention and Control China University of Mining and TechnologyXuzhou221116China State Key Laboratory for Geomechanics&Deep Underground Engineering China University of Mining TechnologyXuzhou221116China School of Environment and Safety Engineering North University of ChinaTaiyuan030051China School of Materials Engineering Changshu Institute of TechnologySuzhou215506China

Deep coal-energy mining frequently results in microseismic(MS)events,which may be a precursor to the risk of rockbursts and pose risks to human safety and ***,quantitatively predicting the time,energy,and location(TEL)of future MS events is crucial for understanding and preventing potential catastrophic *** this study,we introduced the application of spatiotemporal graph convolutional networks(STGCN)to predict the TEL of MS events induced by deep coal-energy ***,this was the first application of graph convolution networks(GCNs)in the spatiotemporal prediction of MS *** adjacency matrices of the sensor networks were determined based on the distance between MS sensors,the sensor network graphs we constructed,and GCN was employed to extract the spatiotemporal details of the *** model is simple and *** testing the model with on-site MS monitoring data,our results demonstrated promising efficacy in predicting the TEL of MS events,with the cosine similarity(C)above 0.90 and the mean relative error(MRE)below *** is critical to improving the safety and operational efficiency of deep coal-energy mining.

关键词： Rockburst Microseismic system Monitoring and early warning Artificial intelligence

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The iron-based biochar activating chlorite(ClO_(2)^(−))driven by mechanochemical ultrasonic:piecewise kinetics,biomimetic catalytic-mechanism,and novel advanced redox process

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Frontiers of environmental Science & engineering 2025年第2期19卷 151-168页

作者： Qihui Xu Qianhui Yang Yuming Xie Lin Hu Zhenghao Fei Hong You School of Chemical and Environmental Engineering Yancheng Teachers UniversityYancheng 224007China State Key Laboratory of Urban Water Resources and Environment Harbin Institute of TechnologyHarbin 150090China School of Marine Science and Technology Harbin Institute of Technology at WeihaiWeihai 264209China

Chlorite(ClO_(2)^(−)or COI)is used to establish the advanced reduction and oxidation process(AROP).The iron/biochar-based particles(iron-based hydrothermal carbon with hinge-like structure,FebHCs,20 mg/L)can be utilized to activate COI(2 mmol/L)to present selective oxidation in removing triphenylmethane derivatives(15 min,90%).The protonation(H+at~102μmol/L level)played a huge role(k-2nd=0.136c-H+−0.014(R^(2)-adj=0.986),and rapp=−0.0876/c-H++1.017(R^(2)-adj=0.996))to boost the generation of the active species(e.g.,high-valent iron oxidizing species(HVI=O)and chlorine dioxide(ClO_(2))).The protonation-coupled electron transfer promoted Fe-substances in Feb/HCs activating COI(the calculated kobs ranging from 0.066−0.285 min^(−1)).The form of ClO_(2) mainly attributed to proton-coupled electron transfer(1e/1H+).The HVI=O was generated from the electron transfer within the coordination ***,carbon particles in FebHCs serve as the bridge for electron *** above roles contribute to the fracture and formation of coordination-induced bonds between Lx-FeII/III and ClO_(2)^(−)at phase interface to form *** ultrasonic(US)cavitation enhanced the mass transfer of active species in bulk solution,and the HVI=O and ClO_(2) attack unsaturated central carbon atoms of triphenylmethane derivatives to initiate selective ***,the scale-up experiment with continuous flow(k values of approximately 0.2 min^(−1),COD removal efficiency of approximately 80%)and the reactor with COMSOL simulation have also proved the applicability of the *** study offers a novel AROP and new insights into correspondingly heterogeneous interface activation mechanisms.

关键词： Chlorite Iron-based biochar Ultrasonic Chlorine dioxide High-valent iron oxidizing species

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Effects of high temperature and thermal cycles on fracture surface's roughness of granite:An insight on 3D morphology

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Journal of Rock Mechanics and Geotechnical engineering 2025年第2期17卷 810-826页

作者： Qixiong Gu Zhen Huang Kui Zhao Wen Zhong Li Liu Xiaozhao Li Yun Wu Ma Dan Key Laboratory of Mining Engineering of Jiangxi Province Jiangxi University of Science and TechnologyGanzhou341000China School of Resources and Environment Engineering Jiangxi University of Science and TechnologyGanzhou341000China State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhou221116China School of Resources and Earth Science China University of Mining and TechnologyXuzhou221116China School of Mines China University of Mining and TechnologyXuzhou221116China

The roughness of the fracture surface directly affects the strength,deformation,and permeability of the surrounding rock in deep underground *** the effect of high temperature and thermal cycle on the fracture surface roughness plays an important role in estimating the damage degree and stability of deep rock *** this paper,the variations of fracture surface roughness of granite after different heating and thermal cycles were investigated using the joint roughness coefficient method(JRC),three-dimensional(3D)roughness parameters,and fractal dimension(D),and the mechanism of damage and deterioration of granite were *** experimental results show an increase in the roughness of the granite fracture surface as temperature and cycle number were *** variations of JRC,height parameter,inclination parameter and area parameter with the temperature conformed to the Boltzmann's functional distribution,while the D decreased linearly as the temperature ***,the anisotropy index(Ip)of the granite fracture surface increased as the temperature increased,and the larger parameter values of roughness characterization at different temperatures were attained mainly in directions of 20°–40°,60°–100°and 140°–160°.The fracture aperture of granite after fracture followed the Gauss distribution and the average aperture increased with increasing temperature,which increased from 0.665 mm at 25℃to 1.058 mm at 800℃.High temperature caused an uneven thermal expansion,water evaporation,and oxidation of minerals within the granite,which promoted the growth and expansion of microfractures,and reduced interparticle bonding *** particular,the damage was exacerbated by the expansion and cracking of the quartz phase transition after T>500℃.Thermal cycles contributed to the accumulation of this damage and further weakened the interparticle bonding forces,resulting in a significant increase in the roughness,anisotropy,and aperture of the

关键词： Granite Thermal cycles High temperature Fracture surface roughness Anisotropic Thermal damage

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Propagation criterion of hydraulic fracture in rock based on the rock micro-cracking mechanism

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International Journal of Mining Science and technology 2025年第3期35卷 433-449页

作者： Qingwang Cai Bingxiang Huang Xinglong Zhao Yuekun Xing School of Resources Environment and Safety Engineering University of South ChinaHengyang 421001 China State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources China University of Mining and TechnologyXuzhou 221116 China

Hydraulic fracture(HF)formed in rock significantly helps with the development of geo-energy and *** HF formation condition was challenging to understand,with obscure rock micro-cracking mechanisms being a key *** rock micro-cracking mechanism under gradient pore water pressure was analyzed on the scale of mineral particles and it was combined with macroscopic boundary conditions of rock hydraulic fracturing,obtaining the propagation criterion of HF in rock based on the rock micro-cracking mechanism which was verified by *** results show that the disturbed skeleton stress induced by the disturbance of gradient pore water pressure in rock equals the pore water pressure *** overall range of the defined mechanical shape factor a/b is around 1,but greater *** the combined influence of pore water pressure differences and macroscopic boundary stresses on the rock micro-cracking,micro-cracks form among rock mineral particles,micro-cracks connect to form micro-hydraulic fracture surfaces,and micro-hydraulic fracture surfaces open to form macrohydraulic *** begins to form at the micro-cracking initiation pressure(MCIP),which was tested by keeping the HF tip near the initiation *** theoretical value of MCIP calculated by the proposed propagation criterion is close to MCIP tested.

关键词： Hydraulic fracture Propagation criterion Micro-cracking mechanism Pore pressure Stress singularity

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Three Coordination Compounds Based on the Rigid N-Donor Ligand: Syntheses, Crystal Structures, Hirshfeld Surface Analyses and Luminescent Properties

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Russian Journal of Coordination Chemistry/Koordinatsionnaya Khimiya 2025年第1期51卷 68-77页

作者： Song, J. Wu, M. Zhou, Y.L. Duan, B.F. Zhang, L. Lu, J.F. Shaanxi Key Laboratory of Catalysis College of Chemical and Environment Science Shaanxi University of Technology Han Zhong723001 China Trine Engineering Institute Shaanxi University of Technology Han Zhong723001 China

Abstract: Three new coordination compounds, [Zn2(Dpb)(2-Btc)(OH)]n·0.5nH2O (Ι), [Cd2(Dpb)2(m-Bdc)2]n (II), [Cd(Dpb)(HBtc)(H2O)2]·H2O (III) (Dpb = 2,6-di(pyrazin-2-yl)-4,4'-bipyridine, H3(2-Btc) = benzene-1,2,4-tricarboxylic acid, m-H2Bdc = 1,3-benzenedicarboxylic acid, H3Btc = benzene-1,3,5-tricarboxylic acid), were designed and synthesized. Their structures have been characterized by elemental analyses, infrared spectra and X-ray single-crystal diffraction analyses (CCDC nos. 2373881 (Ι), 2080659(II) and 2373880 (III)). Compound Ι and II exhibit 2D structure, and compound III shows a mononuclear structure. The differences in the structures of Ι–III reveal that the auxiliary ligand exerts an important effect on the ultimate structures. Moreover, Hirshfeld Surface analysis of coordination compounds Ι–III were performed by Crystal Explorer 21 program. Furthermore, the solid-state luminescence emissions, the fluorescence decays and the CIE chromaticity coordinates of Ι–III were also investigated. © Pleiades Publishing, Ltd. 2025.

关键词： Benzene

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Boosting electrochemical reduction of CO_(2)to CO using molecule-regulated Ag nanoparticle in ionic liquids

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Green Energy & environment 2025年第4期10卷 813-820页

作者： Fangfang Li Kuilin Peng Chongyang Jiang Shaojuan Zeng Xiangping Zhang Xiaoyan Ji Energy Engineering Division of Energy ScienceLuleåUniversity of TechnologyLuleå97187Sweden Beijing Key Laboratory of Ionic Liquids Clean Process State Key Laboratory of Multiphase Complex SystemsInstitute of Process EngineeringChinese Academy of SciencesBeijing100190China College of Chemical Engineering and Environment China University of PetroleumBeijing102249China

Electrochemical reduction of CO_(2)is a promising approach to convert CO_(2)to high-valued chemicals and ***,developing efficient electrocatalysts featuring desirable activity and selectivity is still a big *** this work,a strategy of introducing functionalized molecules with desirable CO_(2)affinity to regulate Ag catalyst for promoting electrochemical reduction of CO_(2)was ***,3-mercapto-1,2,4-triazole was introduced onto the Ag nanoparticle(Ag-m-Triz)for the first time to achieve selectively converting CO_(2)to carbon monoxide(CO).This Ag-m-Triz exhibits excellent performance for CO_(2)reduction with a high CO Faradaic efficiency(FECO)of 99.2%and CO partial current density of 85.0 mA cm^(-2)at-2.3 V ***/Agt in H-cell when combined with the ionic liquid-based electrolyte,30 wt%1-butyl-3-methylimidazolium hexafluorophosphate([Bmim][PF6])-65 wt%acetonitrile(AcN)-5 wt%H2O,which is 2.5-fold higher than the current density in Ag-powder under the same *** studies confirm that the significantly improved performance of Ag-m-Triz originates from(i)the stronger adsorption ability of CO_(2)molecule and(ii)the weaker binding energy to form the COOH*intermediate on the surface of Ag-m-Triz compared with the Ag-powder catalyst,which boosts the conversion of CO_(2)to *** research provides a facile way to regulate electrocatalysts for efficient CO_(2)reduction by introducing functionalized molecules.

关键词： CO_(2)reduction CO Electrochemical Molecule-regulated Silver Ionic liquid

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