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Centrifuge modeling of unreinforced and multi-row stabilizing piles reinforced landslides subjected to reservoir water level fluctuation

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第5期16卷 1600-1614页

作者： chenyang zhang Yueping Yin Hui Yan Sainan Zhu Ming zhang Luqi Wang Department of Civil Engineering The University of Hong KongHong KongChina China Institute of Geo-environment Monitoring BeijingChina Chongqing 107 Municipal Construction Engineering Co. Ltd.ChongqingChina Faculty of Engineering China University of GeosciencesWuhanChina School of Civil Engineering Chongqing UniversityChongqingChina

With the construction of the Three Gorges Reservoir dam,frequent reservoir landslide events have been *** recent years,multi-row stabilizing piles(MRSPs)have been used to stabilize massive reservoir landslides in *** this study,two centrifuge model tests were carried out to study the unreinforced and MRSP-reinforced slopes subjected to reservoir water level(RWL)operation,using the Taping landslide as a *** results indicate that the RWL rising can provide lateral support within the submerged zone and then produce the inward seepage force,eventually strengthening the slope ***,a rapid RWL drawdown may induce outward seepage forces and a sudden debuttressing effect,consequently reducing the effective soil normal stress and triggering partial pre-failure within the RWL fluctuation ***,partial deformation and subsequent soil structure damage generate excess pore water pressures,ultimately leading to the overall failure of the reservoir *** study also reveals that a rapid increase in the downslope driving force due to RWL drawdown significantly intensifies the lateral earth pressures exerted on the ***,the MRSPs possess a considerable reinforcement effect on the reservoir landslide,transforming the overall failure into a partial deformation and failure situated above and in front of the *** mechanical transfer behavior observed in the MRSPs demonstrates a progressive alteration in relation to RWL *** the RWL rises,the mechanical states among MRSPs exhibit a growing *** shear force transfer factor(*** ratio of shear forces on pile of the n th row to that of the first row)increases significantly with the RWL *** indicates that the mechanical states among MRSPs tend toward an enhanced *** insights gained from this study contribute to a more comprehensive understanding of the failure mechanisms of reservoir landslides and the mechanical behavior of M

关键词： Reservoir landslide Failure mechanism Multi-row stabilizing piles Mechanical behavior

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Turbo-shaft engine adaptive neural network control based on nonlinear state space equation

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Chinese Journal of Aeronautics 2024年第4期37卷 493-507页

作者： Ziyu GU Qiuhong LI Shuwei PANG Wenxiang ZHOU Jichang WU chenyang zhang Jiangsu Province Key Laboratory of Aerospace Power System Nanjing University of Aeronautics and AstronauticsNanjing 210016China AECC Hunan Aviation Powerplant Research Institute Zhuzhou 412002China

Intelligent Adaptive Control(AC) has remarkable advantages in the control system design of aero-engine which has strong nonlinearity and uncertainty. Inspired by the Nonlinear Autoregressive Moving Average(NARMA)-L2 adaptive control, a novel Nonlinear State Space Equation(NSSE) based Adaptive neural network Control(NSSE-AC) method is proposed for the turbo-shaft engine control system design. The proposed NSSE model is derived from a special neural network with an extra layer, and the rotor speed of the gas turbine is taken as the main state variable which makes the NSSE model be able to capture the system dynamic better than the NARMA-L2 model. A hybrid Recursive Least-Square and Levenberg-Marquardt(RLS-LM) algorithm is advanced to perform the online learning of the neural network, which further enhances both the accuracy of the NSSE model and the performance of the adaptive controller. The feedback correction is also utilized in the NSSE-AC system to eliminate the steady-state tracking error. Simulation results show that, compared with the NARMA-L2 model, the NSSE model of the turboshaft engine is more accurate. The maximum modeling error is decreased from 5.92% to 0.97%when the LM algorithm is introduced to optimize the neural network parameters. The NSSE-AC method can not only achieve a better main control loop performance than the traditional controller but also limit all the constraint parameters efficiently with quick and accurate switching responses even if component degradation exists. Thus, the effectiveness of the NSSE-AC method is validated.

关键词： Adaptive control systems Turbo-shaft engine Neural network Nonlinear state space equation NARMA-L2

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Engineering single-atom Mn on nitrogen-doped carbon to regulate lithium-peroxide reaction kinetics for rechargeable lithium-oxygen batteries

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Journal of Energy Chemistry 2024年第7期94卷 199-207页

作者： Yaling Huang Yong Liu Yang Liu chenyang zhang Wenzhang Li Jie Li School of Chemistry and Chemical Engineering Central South UniversityChangsha 410083HunanChina School of Minerals Processing and Bioengineering Central South UniversityChangsha 4003HunanChina

Precision engineering of catalytic sites to guide more favorable pathways for Li_(2)O_(2) nucleation and decom-position represents an enticing kinetic strategy for mitigating overpotential,enhancing discharge capac-ity,and improving recycling stability of Li-O_(2) *** this work,we employ metal-organic frameworks(MOFs)derivation and ion substitution strategies to construct atomically dispersed Mn-N_(4) moieties on hierarchical porous nitrogen-doped carbon(Mn SAs-NC)with the aim of reducing the over-potential and improving the cycling stability of Li-O_(2) *** porous structure provides more chan-nels for mass transfer and exposes more highly active sites for electrocatalytic reactions,thus promoting the formation and decomposition of Li_(2)O_(2).The Li-O_(2) batteries with Mn SAs-NC cathode achieve lower overpotential,higher specific capacity(14290 mA h g^(-1) at 100 mAg^(-1)),and superior cycle stability(>100 cycles at 200 mA g^(-1))compared with the Mn NPs-NC and *** functional theory(DFT)cal-culations reveal that the construction of Mn-N_(4) moiety tunes the charge distribution of the pyridinic N-rich vacancy and balances the affinity of the intermediates(LiO_(2) and Li_(2)O_(2)).The initial nucleation of Li_(2)O_(2) on Mn SAs-NC favors the O_(2)-→LiO_(2)→Li_(2)O_(2) surface-adsorption pathway,which mitigates the overpoten-tials of the oxygen reduction(ORR)and oxygen evolution reaction(OER).As a result,Mn SAs-NC with Mn-N_(4) moiety effectively facilitates the Li_(2)O_(2) nucleation and enables its reversible *** work establishes a methodology for constructing carbon-based electrocatalysts with high activity and selectivity for Li-O_(2)batteries.

关键词： Single-atom Mn MOFs-oriented architecture Rechargeable Li-O_(2)battery N-doped carbon Density functional theory calculation

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Simulation of fire emergency evacuation in a large-passenger-flow subway station based on the on-site measured data of Shenzhen Metro

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Transportation Safety and Environment 2024年第1期6卷 47-55页

作者： Hua Chen chenyang zhang Jieyu zhang Ya Shu Xinjian Qi Chaozhe Jiang Sichuan FAST Fire Safety Assessment Co. LTD.Chengdu 610036SichuanChina School of Transportation and Logistics Southwest Jiaotong UniversityChengdu 611756SichuanChina Sichuan Fire Research Institute of MEM Chengdu 610036SichuanChina Shenzhen Metro Group Co. LTD.Shenzhen 518026GuangdongChina

Because of its large capacity,high efficiency and energy savings,the subway has gradually become the primary mode of transportation for citizens.A high density of passengers exists within a large-passenger-flow subway station,and the number of casualties and injuries during a fire emergency is *** this paper,Pathfinder software and on-site measured data of Pingzhou station in Shenzhen(China)were utilized to simulate a fire emergency evacuation in a large-passenger-flow subway *** Required Safe Egress Time(RSET),number of passengers and flow rates of stairs and escalators were analysed for three fire evacuation scenarios:train fire,platform fire and hall *** evacuation time of the train fire,which was 1173 s,was the longest,and 3621 occupants needed to evacuate when the train was fully *** could not complete the evacuation within 6 mins in all three fire evacuation scenarios,which does not meet the current standard requirements and *** changing the number of passengers and the number of stairs for evacuation,the flow rate capacity and evacuation time were explored,which have reference values for safety management and emergency evacuation plan optimization during peak hours of subway operation.

关键词： fire emergency evacuation large-passenger-flow subway station on-site measured data Pathfinder

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Defined organic-octamolybdate crystalline superstructures derived Mo_(2)C@C as efficient hydrogen evolution electrocatalysts

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Chinese Chemical Letters 2024年第6期35卷 201-205页

作者： Jiao Li chenyang zhang Chuhan Wu Yan Liu Xuejian zhang Xiao Li Yongtao Li Jing Sun Zhongmin Su School of Materials Science and Engineering Jilin Jianzhu UniversityChangchun 130018China School of Chemical and Environmental Engineering Changchun University of Science and TechnologyChangchun 130022China

Hydrogen evolution electrocatalysts derived from metal-organic crystalline frameworks can inherit the merits of ordered and adjustable structures with high surface *** this paper,organic-octamolybdate crystalline superstructures(OOCS)with a fixed stoichiometric ratio of Mo_(8)(L)_(2) and high Mo content(>40 wt%)were synthesized using flexible ligands with controllable lengths(named as OOCS-1-3).Then,molybdenum carbides coated with carbon layers as electrocatalysts(Mo_(2)C@C-1-3)can be obtained directly from a one-step high-temperature carbonization process using OOCS-1-3 as *** a typical example,Mo_(2)C@C-3 exhibits satisfactory hydrogen evolution activity with a low overpotential of 151 m V(1.0 mol/L KOH)at 10 m A/cm^(2) and stability for 24 *** electrocatalytic activity is mainly from the synergistic interactions between the carbon layers and molybdenum carbide ***,compared with the initial content of C,N,Mo in OOCS and Mo_(2)C@C,the catalytic activity increases with the N *** work makes organic-octamolybdate crystalline superstructures used as general precursors to product high Mo content electrocatalysts applied in energy storage and conversion fields.

关键词： Molybdenum carbides Electrocatalysts Organic-octamolybdate crystalline superstructures Synergistic interactions Hydrogen evolution reaction(HER)

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Differentiated self-assembly through orthogonal noncovalent interactions towards the synthesis of two-dimensional woven supramolecular polymers

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Chinese Chemical Letters 2024年第5期35卷 179-182页

作者： Zhenzhu Wang Chenglong Liu Yunpeng Ge Wencan Li chenyang zhang Bing Yang Shizhong Mao Zeyuan Dong State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012China Center for Supramolecular Chemical Biology Jilin UniversityChangchun 130012China

Molecular weaving is a powerful approach to make molecularly woven materials that have showed unprecedented characteristics and properties intrinsically distinct to those of non-woven *** here report a facile and efficient approach for the synthesis of 2D woven supramolecular polymers by differentiated self-assembly through orthogonal noncovalent ***,the difference in binding strength of two orthogonal noncovalent interactions can be used to control the process of molecular ***,single-layered 2D woven supramolecular polymers were synthesized and fully characterized by various *** study demonstrates a controllable method for molecular weaving,and will significantly hasten the development of molecularly woven materials.

关键词： Differentiated self-assembly Double-stranded helix Molecular weaving Supramolecular chemistry Two-dimensional polymer

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Machine learning noise exposure detection of rail transit drivers using heart rate variability

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Transportation Safety and Environment 2024年第2期6卷 122-132页

作者： Zhiqiang Sun Haiyue Liu Yubo Jiao chenyang zhang Fang Xu Chaozhe Jiang Xiaozhuo Yu Gang Wu School of Transportation and Logistics Southwest Jiaotong UniversityChengdu 611756China Lanzhou Rail Transit Co. Ltd.Lanzhou 730000China Sichuan Tourism University Chengdu 610100China PagerDuty Inc.905 King StWTorontoON M6K 3G9Canada

Previous studies have found that drivers’physiological conditions can deteriorate under noise conditions,which poses a potential hazard when *** a result,it is crucial to identify the status of drivers when exposed to different ***,such explo-rations are rarely discussed with short-term physiological indicators,especially for rail transit *** this study,an experiment involving 42 railway transit drivers was conducted with a driving simulator to assess the impact of noise on drivers’physiological *** the individuals’heterogeneity,this study introduced drivers’noise annoyance to measure their *** variances of drivers’heart rate variability(HRV)along with different noise adaptions are explored when exposed to different noise *** machine learning approaches(support vector machine,K-nearest neighbour and random forest)were then used to classify their physiological status under different noise conditions according to the HRV and drivers’self-noise *** indicate that the volume of traffic noise negatively affects drivers’performance in their *** with different noise adaptions but exposed to a fixed noise were found with discrepant HRV,demonstrating that noise adaption is highly associated with drivers’physiological status under *** is also found that noise adaption inclusion could raise the accuracy of ***,the random forests classifier performed the best in identifying the physiological status when exposed to noise conditions for drivers with different noise adaptions.

关键词： noise exposure detection noise adaption heart rate variability(HRV) machining learning simulator experiment

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碳氮复合镍催化剂催化的高选择性己二腈加氢制备环己亚胺

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高等学校化学学报 2024年第4期45卷 68-77页

作者：张晨阳贾晨旭黄军南京工业大学化工学院材料化学工程国家重点实验室南京210009

环己亚胺是一种重要的医药农药中间体,可用于合成青霉素、除草剂和杀菌剂等.本文应用溶剂辅助机械球磨和热解法制备了一系列的负载型Ni基催化剂Ni/IM-C(R),研究了该催化剂对于1,6-己二腈加氢制备环己亚胺的工艺.结果表明,由乙酸镍、 2-... 详细信息

环己亚胺是一种重要的医药农药中间体,可用于合成青霉素、除草剂和杀菌剂等.本文应用溶剂辅助机械球磨和热解法制备了一系列的负载型Ni基催化剂Ni/IM-C(R),研究了该催化剂对于1,6-己二腈加氢制备环己亚胺的工艺.结果表明,由乙酸镍、 2-甲基咪唑及活性炭共同球磨、煅烧还原所制备的Ni/IM-C(R)具有优良的1,6-己二腈加氢活性和98%以上的环己亚胺收率.通过X射线衍射(XRD)、 X射线光电子能谱(XPS)、扫描电子显微镜(SEM)、能量色散X射线(EDX)、透射电子显微镜(TEM)和N2吸附-脱附测试等表征手段研究了Ni/IM-C(R)催化剂的表面织构性质和化学性质.结果表明,氮掺杂碳材料改善了Ni/IM-C(R)催化剂活性金属Ni纳米颗粒的分散性.在Ni/IM-C(R)催化剂中,镍物种具有高活性,尺寸较小且表面Ni0含量高.在无添加剂存在下, Ni/IM-C(R)催化1,6-己二腈加氢环化制备环己亚胺时显示出良好的加氢活性和环己亚胺的高选择性.Ni/IM-C(R)催化剂制备方法简单、反应后易于分离、多次反应循环后仍具有稳定的催化性能,具有良好的工业应用前景.

关键词：环己亚胺己二腈镍催化剂选择催化加氢

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小檗碱及其体内代谢产物对高糖诱导大鼠H9c2心肌细胞损伤的保护作用

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药物评价研究 2024年第1期47卷 68-78页

作者：张晨阳张琳杨卫利首都医科大学附属北京同仁医院内分泌科北京100730 北京市糖尿病研究所北京100730

目的探究小檗碱及其体内代谢产物对高糖诱导大鼠H9c2心肌细胞损伤的保护作用。方法将H9c2心肌细胞分成对照组、模型组、正常给药组、模型给药组,对照组用无血清DMEM培养,正常给药组于无血清DMEM中加药,模型组用含50 mmol·L^(-1)葡萄... 详细信息

目的探究小檗碱及其体内代谢产物对高糖诱导大鼠H9c2心肌细胞损伤的保护作用。方法将H9c2心肌细胞分成对照组、模型组、正常给药组、模型给药组,对照组用无血清DMEM培养,正常给药组于无血清DMEM中加药,模型组用含50 mmol·L^(-1)葡萄糖的无血清DMEM培养(造模剂量筛选实验设置25、50、100、200 mmol·L^(-1)),模型给药组于高糖无血清DMEM中加药,加药浓度分别为小檗碱1.25、2.50、5.00、10.00μmol·L^(-1),二氢小檗碱(DHB) 0.5、1.0、2.0、4.0μmol·L^(-1),小檗红碱1.25、2.50、5.00、10.00μmol·L^(-1),非洲防己碱(COL)1.25、2.50、5.00、10.00μmol·L^(-1),巴马汀3.125、6.250、12.500、25.000μmol·L^(-1),药根碱6.25、12.50、25.00、50.00μmol·L^(-1),去亚甲基小檗碱(DEM)6.25、12.50、25.00、50.00μmol·L^(-1),处理48 h后,通过细胞增殖计数(CCK-8)法检测细胞存活率;通过实时荧光定量聚合酶链式反应(qRT-PCR)检测经典代谢调控通路沉默调节蛋白1(Sirt1)、过氧化物酶体增殖物激活受体-γ共激活因子1α(PGC1α)、过氧化物酶体增殖物激活受体α(PPARα)基因水平,葡萄糖代谢相关基因丙酮酸脱氢酶激酶4 (PDK4)、葡萄糖激酶(GCK)、己糖激酶(HK2)、葡萄糖转运蛋白4(Glut4)表达水平,线粒体动力学相关基因线粒体融合蛋白2 (Mfn2)、视神经萎缩蛋白1 (OPA1)、动力学相关蛋白1(Drp1)水平及细胞凋亡相关基因天冬氨酸特异性半胱氨酸蛋白酶3(Caspase-3)、Caspase-9、Bcl-2相关X蛋白(Bax)、 B淋巴细胞瘤-2 (Bcl-2)水平;通过Westernblotting实验检测PGC1α、 Glut4、线粒体氧化磷酸化系统(OXPHOS)蛋白表达。结果与高糖模型组相比,小檗碱2.5、5.0、10.0μmol·L^(-1),DHB 1、2μmol·L^(-1),COL 5、10μmol·L^(-1),巴马汀12.5μmol·L^(-1),药根碱25、50μmol·L^(-1),DEM 12.5、25.0μmol·L^(-1)处理48 h的细胞存活率均显著上升(P<0.05、0.01、0.001);小檗碱、DHB、药根碱、DEM处理的心肌细胞中PDK4水平显著增加(P<0.05、0.001),小檗碱、DHB、DEM处理的心肌细胞中GCK水平显著增加(P<0.01、0.001),小檗碱、DHB、COL、巴马汀、DEM处理的心肌细胞中HK2水平显著增加(P<0.05、0.01),DEM处理的心肌细胞中Glut4水平显著增加(P <0.001);药根碱、DEM处理的心肌细胞中OPA1水平显著增加(P<0.05、0.001),小檗碱、DHB、COL、巴马汀、药根碱、DEM处理的心肌细胞中Drp1水平显著降低(P<0.01、0.001),小檗碱、DHB、药根碱、DEM处理的心肌细胞中Mfn2水平显著增加(P<0.05、0.001);小檗碱、DHB、COL处理的心肌细胞中Caspase-3水平显著降低(P<0.01、0.001),小檗碱、小檗红碱、COL、巴马汀处理的心肌细胞中Caspase-9水平显著降低(P<0.01、0.001),小檗碱、DHB、小檗红碱、COL、巴马汀、药根碱、DEM处理的心肌细胞中Bax水平显著降低(P<0.05、0.001),小檗碱、DHB、巴马汀处理的心肌细胞中Bcl-2水平显著增加(P<0.01、0.001);小檗碱及其代谢产物处理的心肌细胞中PGC1α、Glut4、OXPHOS表达均明显增加。结论小檗碱体内代谢产物可以缓解高糖造成的H9c2心肌细胞损伤,其作用机制与调控Sirt1/PGC1α/PPARα信号通路,促进H9c2心肌细胞葡萄糖代谢、改善线粒体功能、抑制细胞凋亡有关。

关键词：小檗碱体内代谢产物高糖 H9c2细胞心肌细胞损伤糖代谢线粒体凋亡二氢小檗碱小檗红碱非洲防己碱巴马汀药根碱去亚甲基小檗碱

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历史、现实与未来:中国式现代化道路的内在逻辑探究

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荆楚学刊 2024年第5期25卷 82-87页

作者：张晨旸太原科技大学马克思主义学院山西太原030000

中国式现代化道路是中国共产党立足于中国具体国情以及深刻把握现代化发展规律的基础上形成的成果。从历史维度看,近代中国的救亡图存为中国式现代化奠定了历史基础;从现实维度来看,发展是解决中国一切问题的基础和关键;从未来维度看,... 详细信息

中国式现代化道路是中国共产党立足于中国具体国情以及深刻把握现代化发展规律的基础上形成的成果。从历史维度看,近代中国的救亡图存为中国式现代化奠定了历史基础;从现实维度来看,发展是解决中国一切问题的基础和关键;从未来维度看,第二个百年奋斗目标从整体上谋划出中国式现代化的发展蓝图。因此,对应上述三个维度,中国式现代化道路行稳致远的内在逻辑就是立足于我国国情、追求高质量发展以及走“并联式”发展的现代化道路。

关键词：中国式现代化中华民族伟大复兴中国国情高质量发展 “并联式”发展

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