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Method for determining the position of landslide slip-surface with a typical inclinometric curves

Journal of Mountain Science 2024年第2期21卷 413-432页

作者： chen Hao WU Hong-gang Ocean College Zhejiang UniversityZhoushan 316000China China Northwest Research Institute Co.Ltd.of CREC Lanzhou 730070China

In the actual monitoring of deep hole displacement,the identification of slip surfaces is primarily based on abrupt changes observed in the inclinometric *** conventional identification methods,inclinometric curves exhibiting indications of sliding can be categorized into three types:b-type,D-type,and *** position of the slip surface is typically determined by identifying the depth corresponding to the point of maximum displacement ***,this method is sensitive to the interval of measurement points and the observation scale of the coordinate axes and suffers from unclear sliding surfaces and uncertain *** on the variation characteristics of these diagonal curves,we classified the landslide into three components:the sliding body,the sliding interval,and the immobile ***,three different generalization models were established to analyze the relationships between the curve form and the slip surface location based on different physical indicators such as displacement rate,relative displacement,and *** results show that the displacement rate curves of an r-type slope exhibit a clustering feature in the sliding interval,and by solving for the depth of discrete points within the step phase,it is possible to determine the location of the slip *** the other hand,D-type slopes have inflection points in the relative displacement curve located at the slip *** acceleration curves of b-type slopes exhibit clustering characteristics during the sliding interval,while the scattered acceleration data demonstrate wandering ***,the slip surface location can be revealed by solving the depth corresponding to the maximum acceleration with cubic spline *** approach proposed in this paper was applied to the monitoring data of a landslide in yunnan Province,*** results indicate that our approach can accurately identify the slip surface location and enable computability of its po

关键词： Inclinometric curve Slip-surface position Displacement rate Relative displacement Acceleration

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Ir single atoms on NiFeZn-LDH matrix for exceptional oxygen evolution reaction

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Nano Research 2024年第8期17卷 7039-7044页

作者： Muhammad Israr Muhammad Humayun Jiaqi Zhang Khadim Shah Xin Tan chen chen yadong Li Department of Chemistry Tsinghua UniversityBeijing 100084China Energy Water and Environment LabCollege of Humanities and SciencePrince Sultan UniversityRiyadh11586Saudi Arabia

To address the sluggish kinetics of the oxygen evolution reaction(OER),a potential approach is to rationally design and fabricate extremely effective single atom catalysts(SACs).Using an appropriate matrix to stabilize single-atom active centers with optimal geometric and electronic structures is crucial for enhancing catalytic ***,we report the design and fabrication of Ir single atoms on NiFeZn layered double hydroxide(Ir-SAC/NiFeZn-LDH)electrocatalyst for highly efficient and stable *** is investigated that the NiFeZn support exhibits abundant defect sites and unsaturated coordination *** sites function to anchor and stabilize single Ir single atoms on the *** strong synergetic electronic interaction between the Ir single atoms and the NiFeZn matrix resulted in remarkable OER performance of the as-fabricated Ir-SAC/NiFeZn *** a loading Ir content of 1.09 wt.%,this catalyst demonstrates a highly stable OER activity,with an overpotential of 196 mV at 10 mA·cm^(−2) and a small Tafel slope of 35 mV·dec^(−1) for the OER in a 1 M KOH *** results significantly surpass the performance of the commercially available IrO_(2) catalyst.

关键词： Ir single atoms layered double hydroxides rational design geometric optimization oxygen evolution reaction

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Strengthening mechanism of different morphologies of nanosized MSH on tribological performance of phosphate/MoS2 bonded solid lubricating coatings

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Friction 2024年第11期12卷 2563-2575页

作者： Zhengchao XI Jianbo SUN Lei chen Haixia CUI yanjun MA Huidi ZHOU Jianmin chen State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Aerospace Research Institute of Materials&Processing Technology Beijing 100076China

Magnesium silicate hydroxides(MSHs)with granular,schistose,and tubular morphologies were separately incorporated to enhance the tribological properties of phosphate/MoS2 composite *** nano-schistose MSH demonstrated superior tribological performance due to its effective interactions with the worn surface and frictional synergies with solid *** of nano-schistose MSH decreased the friction coefficient of composite coatings by about 34.7%and increased the anti-wear performance of composite coatings by about thirteen ***-schistose MSH facilitated the formation of a friction-induced multi-layer heterogenous slipping structure with layered solid lubricants at the friction ***,tribo-chemical reactions between nano-schistose MSH and worn surface promoted the in-situ formation of a cermet supporting film,and this also induced the gradual in-situ formation of a lubrication film on the top of worn ***,the contact state between tribo-pairs was timely regulated and the invalidation of the nanocomposite slipping structure was effectively restrained during the friction *** a result,the service life of the phosphate composite coatings was significantly extended and further abrasion on the worn surface was notably reduced.

关键词： nano-sized magnesium silicate hydroxide(MSH) morphology regulation nanocomposite slipping structure tribo-film

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Data-driven real-time prediction for attitude and position of super-large diameter shield using a hybrid deep learning approach

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Underground Space 2024年第2期15卷 275-297页

作者： yanbin Fu Lei chen Hao Xiong Xiangsheng chen Andian Lu yi Zeng beiling Wang Key Laboratory of Coastal Urban Resilient Infrastructures(MOE) Shenzhen UniversityShenzhen 518060GuangdongChina College of Civil and Transportation Engineering Shenzhen UniversityShenzhen 518060GuangdongChina Shenzhen Key Laboratory of Green Efficient and Intelligent Construction of Underground Metro StationShenzhen UniversityShenzhen 518060GuangdongChina Guangdong yuehai Pearl River Delta Water Supply Limited Company Guangzhou 511458China Shanghai Tunnel Engineering and Rail Transit Design and Research Institute Shanghai 200235China

The presented research introduces a novel hybrid deep learning approach for the dynamic prediction of the attitude and position of super-large diameter shields-a critical consideration for construction safety and tunnel lining *** study proposes a hybrid deep learning approach for predicting dynamic attitude and position prediction of super-large diameter *** approach consists of principal component analysis(PCA)and temporal convolutional network(TCN).The former is used for employing feature level fusion based on features of the shield data to reduce uncertainty,improve accuracy and the data effect,and 9 sets of required principal component characteristic data are *** latter is adopted to process sequence data in predicting the dynamic attitude and position for the advantages and potential of convolution *** approach’s effectiveness is exemplified using data from a tunnel construction project in *** obtained results show remarkable accuracy in predicting the global attitude and position,with an average error ratio of less than 2 mm on four shield outputs in 97.30%of ***,the approach displays strong performance in accurately predicting sudden fluctuations in shield attitude and position,with an average prediction accuracy of 89.68%.The proposed hybrid model demonstrates superiority over TCN,long short-term memory(LSTM),and recurrent neural network(RNN)in multiple *** additive exPlanations(SHAP)analysis is also performed to investigate the significance of different data features in the prediction *** study provides a real-time warning for the shield driver to adjust the attitude and position of super-large diameter shields.

关键词： Shield attitude and position Super-large diameter shield PCA-TCN Deep learning Real-time warning

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Number of J/ψ events at bESIII

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Chinese Physics C 2022年第7期46卷 74-84页

作者： M.Ablikim M.N.Achasov P.Adlarson S.Ahmed M.Albrecht R.Aliberti A.Amoroso M.R.An Q.An X.H.bai y.bai O.bakina R.baldini Ferroli I.balossino y.ban K.begzsuren N.berger M.bertani D.bettoni F.bianchi J.bloms A.bortone I.boyko R.A.briere H.Cai X.Cai A.Calcaterra G.F.Cao N.Cao S.A.Cetin J.F.Chang W.L.Chang G.Chelkov G.chen H.S.chen M.L.chen S.J.chen X.R.chen y.b.chen Z.J.chen W.S.cheng G.Cibinetto F.Cossio J.J.Cui X.F.Cu H.L.Dai J.P.Dai X.C.Dai A.Dbeyssi R.E.de boer D.Dedovich Z.y.Deng A.Denig I.Denysenko M.Destefanis F.De Mori y.Ding C.Dong J.Dong L.y.Dong M.y.Dong X.Dong S.X.Du P.Egorov y.L.Fan J.Fang S.S.Fang y.Fang R.Farinelli L.Fava F.Feldbauer G.Felici C.Q.Feng J.H.Feng M.Fritsch C.D.Fu y.Gao y.Gao I.Garzia P.T.Ge C.Geng E.M.Gersabeck A Gilman K.Goetzen L.Gong W.X.Gong W.Gradl M.Greco L.M.Gu M.H.Gu C..y.Guan A.Q.Guo A.Q.Guo L.b.Guo R.P.Guo y.P.Guo A.Guskov T.T.Han W.y.Han X.Q.Hao F.A.Harris K.K.He K.L.He F.H.Heinsius C.H.Heinz y.K.Heng C.Herold M.Himmelreich T.Holtmann G.y.Hou y.R.Hou Z.L.Hou H.M.Hu J.F.Hu T.Hu y.Hu G.S.Huang L.Q.Huang X.T.Huang y.P.Huang Z.Huang T.Hussain N Husken W.Ikegami Andersson W.Imoehl M.Irshad S.Jaeger S.Janchiv Q.Ji Q.P.Ji X.b.Ji X.L.Ji y.y.Ji H.b.Jiang X.S.Jiang J.b.Jiao Z.Jiao S.Jin y.Jin M.Q.Jing T.Johansson N.Kalantar-Nayestanaki X.S.Kang R.Kappert M.Kavatsyuk b.C.Ke I.K.Keshk A.Khoukaz P.Kiese R.Kiuchi R.Kliemt L.Koch O.b.Kolcu b.Kopf M.Kuemmel M.Kuessner A.Kupsc M.G.Kurth W.Kuhn J.J.Lane J.S.Lange P.Larin A.Lavania L.Lavezzi Z.H.Lei H.Leithoff M.Lellmann T.Lenz C.Li C.H.Li cheng Li D.M.Li F.Li G.Li H.Li H.Li H.b.Li H.J.Li H.N.Li J.L.Li J.Q.Li J.S.Li Ke Li L.K.Li Lei Li P.R.Li S.y.Li W.D.Li W.G.Li X.H.Li X.L.Li Xiaoyu Li Z.y.Li H.Liang H.Liang H.Liang y.F.Liang y.T.Liang G.R.Liao L.Z.Liao J.Libby A.Limphirat C.X.Lin D.X.Lin T.Lin b.J.Liu C.X.Liu D.Liu F.H.Liu Fang Liu Feng Liu G.M.Liu H.M.Liu Huanhuan Liu Huihui Liu J.b.Liu J.L.Liu J.y.Liu K.Liu K.y.Liu Ke Liu L.Liu M.H.Liu P.L.Liu Q.Liu Q.Liu S.b.Liu T.Liu T.Liu W.M.Liu X.Liu y.Liu y.b.Liu Z.A.Liu Z.Q.Liu X.C.Lou F.X.Lu H.J.Lu J.D. Institute of High Energy Physics Beijing 100049China beihang University Beijing 100191China beijing Institute of Petrochemical Technology Beijing 102617China bochum Ruhr-University D-44780 BochumGermany Camnegie Mellon University PittsburghPennsylvania 15213USA Central China Normal University Wuhan 430079China China Center of Advanced Science and Technology Beijing 100190China COMSATS University Islamabad Lahore CampusDefence RoadOff Raiwind Road54000 LahorePakistan Fudan University Shanghai 200443China G.I.budker Institute of Nuclear Physies SbRAS(bINP) Novosibirsk 630090Russia GSI Helmholtzcentre for Heavy Ion Research GmbH D-64291 DarmstadtGermany Guangxi Normal University Guilin 541004China Hangzhou Normal University Hangzhou 310036China Helmholtz Institute Mainz Staudinger Weg 18D-55099 MainzGermany Henan Normal University Xinxiang 453007China Henan University of Science and Technology Luoyang 471003China Henan University of Technology Zhengzhou 450001China Huangshan College Huangshan 245000China Hunan Normal University Changsha 410081China Hunan University Changsha 410082China Indian Institute of Technology Madras Chennai 600036India Indiana University BloomingtonIndiana 47405USA INFN Laboratori Nazionali di Frascati I-00044FrascatiItaly INFN Sezione di Perugia I-06100PerugiaItaly University of Perugia I-06100PerugiaItaly University of Ferrara I-44122FerraraItaly Institute of Modern Physics Lanzhou 730000China Institute of Physies and Technology Peace Ave 54BUlaanbaatar 13330Mongolia Jilin University Changchun 130012China Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45D-55099 MainzGermany Joint Institute for Nuclear Research 141980 DubnaMoscow regionRussia Justus-Liebig-Universitaet Giessen Ⅱ.Physikaliches InstitutHeinricH-Buff-Ring 16D-35392 GiessenGermany Lanzhou University Lnzhou 730000China Liaoning Normal University Dalian 116029China Liaoning University Shenyang 110036China Nanjing Normal University Nanjing 210023China Nanjing Univ

Using inclusive decays of J/ψ aprecise determination of the number of J/ψ events collected with the bESIII detector was *** the two data sets taken in 2009 and 2012,the numbers of J/ψ events were recalculated to be(224.0±1.3)×10^(6) and(1088.5±4.4)×10^(6),respectively;these numbers are in good agreement with the previous measurements. For the J/ψ sample taken in 2017-2019,the number of events was determined to be(8774.0±39.4)×10^(6).The total number of J/ψ events collected with the bESIII detector was determined to be(10087±44)×10^(6),where the uncertainty is dominated by systematic effects,and the statistical uncertainty is negligible.

关键词： number of J/ψevents bESIII detector inclusive J/ψdecays

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The ERF transcription factor LTF1 activates DIR1 to control stereoselective synthesis of antiviral lignans and stress defense in Isatis indigotica roots

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Acta Pharmaceutica Sinica b 2024年第1期14卷 405-420页

作者： Ruibing chen Jian yu Luyao yu Liang Xiao ying Xiao Junfeng chen Shouhong Gao Xianghui chen Qing Li Henan Zhang Wansheng chen Lei Zhang Department of Pharmaceutical botany School of PharmacyNaval Medical UniversityShanghai 200433China Research and Development Center of Chinese Medicine Resources and biotechnology Shanghai University of Traditional Chinese MedicineShanghai 201203China Department of Pharmacy Shanghai Changzheng HospitalNaval Medical UniversityShanghai 200003China School of Medicine Shanghai UniversityShanghai 200433China Institute of Edible Fungi Shanghai Academy of Agricultural SciencesNational Engineering Research Center of Edible FungiKey Laboratory of Edible Fungi Resources and Utilization(South)Ministry of AgricultureShanghai 201403China College of Life Sciences and Medicine Key Laboratory of Plant Secondary Metabolism and Regulation of Zhejiang ProvinceZhejiang Sci-Tech UniversityHangzhou 310018China State Key Laboratory of Dao-di Herbs Beijing 100700China

Lignans are a powerful weapon for plants to resist stresses and have diverse bioactive functions to protect human *** the mechanisms of stereoselective biosynthesis and response to stresses of lignans is important for the guidance of plant ***,we identified the complete pathway to stereoselectively synthesize antiviral(-)-lariciresinol glucosides in Isatis indigotica roots,which consists of three-step sequential stereoselective enzymes DIR1/2,PLR,and ***1 was further identified as the key gene in respoJanuary 2024nse to stresses and was able to trigger stress defenses by mediating the elevation in lignan ***,the phytohormone-responsive ERF transcription factor LTF1 colocalized with DIR1 in the cell periphery of the vascular regions in mature roots and helped resist biotic and abiotic stresses by directly regulating the expression of *** systematic results suggest that DIR1 as the first common step of the lignan pathway cooperates with PLR and UGT71b2 to stereoselectively synthesize(-)-lariciresinol derived antiviral lignans in *** roots and is also a part of the LTF1-mediated regulatory network to resist *** conclusion,the LTF1-DIR1 module is an ideal engineering target to improve plant Defenses while increasing the content of valuable lignans in plants.

关键词： Lignans Stereoselective synthesis Stress resistance Dirigent protein ERF

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Ablative behavior and mechanism of SiC_(f) /SibCZr composites prepared by PIP process

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Journal of Advanced Ceramics 2024年第1期13卷 124-134页

作者： Mingwei chen yuliang Zhao Haipeng Qiu Shijian Liu Weijie Xie yi chen Qiyue Zhang AVIC Manufacturing Technology Institute Beijing 100130China

SiC_(f)/SibCZr composites were prepared by polymer precursor impregnation and pyrolysis process with near stoichiometric ratio SiC fiber preform as reinforcement phase and SibCZr multiphase ceramic precursor as impregnating *** results highlighted that the SiC_(f)/SibCZr composites exhibited excellent ablative properties after ablative tests at 1200℃/3600 s and 1400℃/3600 s,and the strength retention rates of the composites reached 90%and 85%,*** was mainly due to the liquid sealing effect of the ablative products represented by b2O_(3) and SiO_(2)∙b_(2)O_(3),which inhibited the ablative reaction by reducing the diffusion rate of the oxidation medium,and the solid pinning effect of the substances represented by SiO_(2),ZrO_(2),and ZrSiO_(4),which could play high viscosity and high strength characteristics to improve anti-erosion *** above-mentioned SiC_(f)/SibCZr composites with corrosion resistance,oxidation resistance,and ablative resistance provided a solid material foundation and technical support for the development of reusable spacecraft hot-end components.

关键词： near stoichiometric ratio SiC fiber SiC_(f)/SibCZr composite liquid sealing effect solid pinning effect

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The future of artificial hibernation medicine:protection of nerves and organs after spinal cord injury

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Neural Regeneration Research 2024年第1期19卷 22-28页

作者： Caiyun Liu Haixin yu Zhengchao Li Shulian chen Xiaoyin Li Xuyi chen bo chen School of Acupuncture&Moxibustion and Tuina Tianjin University of Traditional Chinese MedicineTianjinChina Research Center of Experimental Acupucture Science Tianjin University of Traditional Chinese MedicineTianjinChina Characteristic Medical Center of Chinese People’s Armed Police Force TianjinChina binhai New Area Hospital of TCM TianjinChina Fourth Teaching Hospital of Tianjin University of TCM TianjinChina

Spinal cord injury is a serious disease of the central nervous system involving irreversible nerve injury and various organ system *** present,no effective clinical treatment *** one of the artificial hibernation techniques,mild hypothermia has preliminarily confirmed its clinical effect on spinal cord ***,its technical defects and barriers,along with serious clinical side effects,restrict its clinical application for spinal cord *** hibernation is a futureoriented disruptive technology for human life *** involves endogenous hibernation inducers and hibernation-related central neuromodulation that activate particular neurons,reduce the central constant temperature setting point,disrupt the normal constant body temperature,make the body adapt"to the external cold environment,and reduce the physiological resistance to cold ***,studying the artificial hibernation mechanism may help develop new treatment strategies more suitable for clinical use than the cooling method of mild hypothermia *** review introduces artificial hibernation technologies,including mild hypothermia technology,hibernation inducers,and hibernation-related central neuromodulation *** summarizes the relevant research on hypothermia and hibernation for organ and nerve *** studies show that artificial hibernation technologies have therapeutic significance on nerve injury after spinal co rd injury through inflammatory inhibition,immunosuppression,oxidative defense,and possible central *** also promotes the repair and protection of res pirato ry and digestive,cardiovascular,locomoto r,urinary,and endocrine *** review provides new insights for the clinical treatment of nerve and multiple organ protection after spinal cord injury thanks to artificial *** present,artificial hibernation technology is not mature,and research fa ces various *** rtheless,the effort is wo rthwhi

关键词： artificial hibernation central thermostatic-resista nt regulation hypothermia multi-system protection neuroprotection organ protection spinal cord injury synthetic torpor

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Particle distributions in Lamb wave based acoustofluidics

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Nanotechnology and Precision Engineering 2024年第2期7卷 60-68页

作者： Chuanchao Zhang Xian chen Wei Wei Xuejiao chen Quanning Li Xuexin Duan Key Laboratory of Precision Measuring Technology and Instruments College of Precision Instrument and Optoelectronics EngineeringTianjin UniversityTianjin300072China

Acoustic streaming enabled by a Lamb wave resonator(LWR)is efficient for particle trapping and enrichment in microfluidic ***,because Lamb waves combine the features of bulk acoustic waves and surface acoustic waves,the resulting acoustic streaming in the LWR occurs in multiple planes,and the particle flow behavior in this acoustofluidic system is largely *** here are numerical simulations and laboratory experiments conducted to investigate the boundary conditions for particle motion inside a microvortex induced by an *** dynamic capture,the particles’trajectories become orbital paths within an acoustic *** suspended particles encounter two distinct acoustic phenomena,i.e.,the drag force resulting from acoustic streaming and the acoustic radiation force,which exert forces in various directions on the *** the acoustic radiation force and the fluid drag force are dominant for large and small particles in a mixed solution,respectively,the large particles reside within the vortex while the small particles remain at its ***,when the acoustic radiation force is dominant for both types of particles,the distribution pattern is reversed.

关键词： Acoustofluidics Lamb wave resonator Particle manipulation Microvortex

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Isotope constraints on seasonal dynamics of nitrogen in Zhanjiang bay, a typical mariculture bay in South China

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Acta Oceanologica Sinica 2024年第6期43卷 60-70页

作者： Chunqing chen Qibin Lao Fajin chen Guangzhe Jin Jiacheng Li Qingmei Zhu College of Ocean and Meteorology Guangdong Ocean UniversityZhanjiang 524088China School of Chemistry and Environment Guangdong Ocean UniversityZhanjiang 524088China Key Laboratory for Coastal Ocean Variation and Disaster Prediction Guangdong Ocean UniversityZhanjiang 524088China Key Laboratory of Climate Resources and Environment in Continental Shelf Sea and Deep Sea of Department of Education of Guangdong ProvinceGuangdong Ocean UniversityZhanjiang 524088China

Eutrophication in coastal waters has been increasing remarkably,severely impacting the water quality in mariculture *** this study,we conducted multiple isotopic measurements on suspended particulate nitrogen(δ^(15)N-PN) and dissolved nitrate(δ^(15)N-NO_(3)^(-)and δ^(18)O-NO_(3)^(-)) in Zhanjiang bay,a typical mariculture bay with a high level of eutrophication in South China,to investigate the changes in nitrogen sources and their cycling between the rainy and dry *** the rainy season,the study found no significant relation between δ^(15)NPN and δ^(15)N-NO_(3)^(-)due to the impact of heavy rainfall and terrestrial *** the upper bay,a slight nitrate loss and slightly higher δ_(15)N-NO_(3)^(-)and δ^(18)O-NO_(3)^(-)values were observed,attributed to intense physical sedimentwater *** some fluctuations,nitrate concentrations in the lower bay mainly aligned with the theoretical mixing line during the rainy season,suggesting that nitrate was primarily influenced by terrestrial erosion and that nitrate isotopes resembled the ***,the isotopic values of nitrate can be used for source apportionment in the rainy *** results indicated that soil nitrogen(36%) and manure and sewage(33%) were the predominant nitrogen sources contributing to nitrogen loads during this *** contrast,the dry season saw a deficient ammonium concentration(bay,due to nearly complete consumption by phytoplankton during the red tide ***,the significant loss of nitrate and simultaneous increase in the stable isotopes of dissolved and particulate nitrogen suggest a strong coupling of assimilation and mineralization during the dry *** active biogeochemical processes during the dry season may be related to decreased runoff and increased water retention ***,our study illustrated the major seasonal nitrogen sources and their dynamics in Zhanjiang b ay,providing valuable insights for formulati

关键词： nitrogen stable nitrogen isotopes biogeochemical processes eutrophication Zhanjiang bay

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