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Recent progress in scanning tunneling microscopy/spectroscopy characterization for magic-angle twisted multilayer graphene 认领 引用
1
作者 Ling-Hui Tong Cheng-Cheng Xu Long-Jing Yin 《Frontiers of physics》 SCIE CSCD 2026年第6期1-30,共30页
In recent years,magic-angle twisted bilayer graphene has emerged as a focal point in condensed matter physics due to its novel quantum properties arising from ultra-flat electronic bands.Subsequent research has also r... In recent years,magic-angle twisted bilayer graphene has emerged as a focal point in condensed matter physics due to its novel quantum properties arising from ultra-flat electronic bands.Subsequent research has also revealed analogous flat-band physics in other twisted multilayer graphene systems,such as twisted monolayer-bilayer graphene,twisted trilayer graphene,and twisted double-bilayer graphene.These graphene-based twisted systems host a rich variety of strongly correlated and topological quantum states—including ferromagnetism,superconductivity,Chern insulators,and the quantum anomalous Hall effect—significantly advancing the investigation of strongly correlated and topological physics in real materials.Here,we conduct a systematic review of the recent advances in the exploration of flat-band and strong correlation physics using scanning tunneling microscopy/spectroscopy in magic-angle twisted multilayer graphene.First,we briefly introduce the theoretical background of the flat-band physics in magic-angle twisted multilayer graphene.Subsequently,we present in detail the strongly correlated electronic states and exotic quantum phenomena observed by scanning tunneling microscopy/spectroscopy in various twisted graphene platforms,including twisted bilayer graphene,twisted monolayer−bilayer graphene,twisted trilayer graphene,and twisted double-bilayer graphene.Lastly,we provide a summary and an outlook for future research in this field. 展开更多
关键词 magic-angle twisted multilayer graphene flat bands strongly correlated effect scanning tunneling microscopy scanning tunneling spectroscopy
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Real-time safety control of shield attitude considering tunneling efficiency 认领 引用
2
作者 Tugen FENG Jinjian HU +3 位作者 Jian ZHANG Guoping REN Yongbo LI Xiaopeng ZHAO 《ENGINEERING Structure and Civil Engineering》 SCIE EI CAS CSCD 2026年第1期80-95,共16页
Shield attitude control is a critical aspect that must be continuously monitored during shield tunneling.To achieve scientifically rational settings for shield tunneling parameters,this study constructed multiple mach... Shield attitude control is a critical aspect that must be continuously monitored during shield tunneling.To achieve scientifically rational settings for shield tunneling parameters,this study constructed multiple machine learning prediction models,including shield attitude deviations and tunneling speed,and optimized the hyperparameters of these models using Bayesian algorithms.Subsequently,a constrained grey wolf optimization(GWO)algorithm was employed to establish a real-time safety control method for attitude that considers tunneling efficiency,by dynamically updating the upper and lower bounds for adjustable parameters.The results indicate that the k-nearest neighbors(KNN)model achieved the highest prediction accuracy;however,due to its specific algorithmic principles,KNN is unsuitable for optimization tasks.Embedding the extreme gradient boosting model into the GWO algorithm yielded the best attitude control performance:the absolute attitude deviations were reduced by an average of 45.1%compared to actual values,while the rate of change for adjustable parameters did not exceed 30%.This approach ensures safety and tunneling efficiency during attitude correction and exhibits universal applicability.Compared with other optimization algorithms,GWO demonstrated significant advantages in both optimization effectiveness and computational time. 展开更多
关键词 shield attitude tunneling speed K-nearest neighbors support vector regression extreme gradient boosting grey wolf optimization
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Role of tunneling nanotubes in neuroglia 认领 引用
3
作者 Weichen Xu Xingyu Yang +2 位作者 Hongmei Zheng Changzheng Chen Jiajia Yuan 《Neural Regeneration Research》 SCIE CAS CSCD 2026年第3期1023-1036,共14页
Tunneling nanotubes are crucial structures for cellular communication and are observed in a variety of cell types.Glial cells,the most abundant cells in the nervous system,play a vital role in intercellular signaling ... Tunneling nanotubes are crucial structures for cellular communication and are observed in a variety of cell types.Glial cells,the most abundant cells in the nervous system,play a vital role in intercellular signaling and can show abnormal activation under pathological conditions.Our bibliometric analysis indicated a substantial increase in research on tunneling nanotubes over the past two decades,highlighting their important role in cellular communication.This review focuses on the formation of tunneling nanotubes in various types of glial cells,including astrocytes,microglia,glioma cells,and Schwann cells,as well as their roles in cellular communication and cargo transport.We found that glial cells influence the stability of the neural system and play a role in nerve regeneration through tunneling nanotubes.Tunneling nanotubes facilitate the transmission and progression of diseases by transporting pathogens and harmful substances.However,they are also involved in alleviating cellular stress by removing toxins and delivering essential nutrients.Understanding the interactions between glial cells through tunneling nanotubes could provide valuable insights into the complex neural networks that govern brain function and responses to injury. 展开更多
关键词 astrocyte cell communication glioma intercellular junctions microglia mitochondria neurodegenerative diseases neuroglia signal transduction tunneling nanotubes
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Mechanical Response of Unsaturated Clay Strata and Adjacent Pipeline under Shield Tunneling Considering Long-Term Pipeline Leakage 认领 引用
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作者 Xin Shi Peng-jun Zou +5 位作者 Xue-jun Sun Hua Cheng Shou-zhong Feng Bin Xu Hai-bing Cai Gang-jian An 《Applied Geophysics》 SCIE CSCD 2026年第2期554-570,866,867,共17页
Long-term,concealed leakage from aging urban pipelines degrades the mechanical properties of unsaturated soils,increasing the likelihood of engineering failures when disturbed by shield tunneling.This study systematic... Long-term,concealed leakage from aging urban pipelines degrades the mechanical properties of unsaturated soils,increasing the likelihood of engineering failures when disturbed by shield tunneling.This study systematically investigates the coupled eff ects of long-term pipeline leakage and shield tunneling in unsaturated clay strata.Test materials were collected through fi eld sampling,and the fi lter paper and temperature–humidity methods were used to measure the suction of unsaturated clay,revealing quantitative relationships between water content and matric suction,total suction,and osmotic suction.Incorporating direct shear tests,the infl uence of suction on soil shear strength was analyzed,and a correlation model relating water content,saturation,suction,and shear strength was developed.The results show that matric and total suction decrease markedly as water content increases,whereas osmotic suction initially increases and then stabilizes with further increases in water content.Both cohesion and internal friction angle decrease with increasing water content,and matric suction dominates the contribution to cohesion under low water content conditions.Based on the saturation–shear strength correlation model,the strength characteristics of the formation aff ected by pipeline leakage were reconstructed,and a three-dimensional numerical model was developed to simulate the coupled effects of pipeline leakage and shield tunneling.The evolution of vertical stratum stress,plastic zone development,and pipeline stress induced by single-line and double-line tunneling was analyzed under various conditions,including small,medium,and large leakage scopes,and leakage lengths of 9 m,27 m,and 45 m.The results indicate that pronounced stress concentration zones develop in the stratum under largescale leakage,and the extent of the plastic zone increases markedly as the leakage scope expands.When the tunnel face approaches the pipeline invert,large-scale plastic deformation inclined toward the excavation face develops in the stratum,and the disturbance is substantially greater than that observed under small-scale leakage or single-line excavation.The fi ndings clarify the mechanical responses of strata and structures under coupled pipeline leakage and tunneling eff ects,providing a theoretical basis and technical support for risk assessment in similar engineering projects. 展开更多
关键词 Shield tunneling Pipeline leakage Unsaturated clay Mechanical response Plastic zone
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Experimental–numerical insights into large-diameter shield tunneling through sand–clay and sand–pebble composite strata 认领 引用
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作者 Zixin ZHANG Ziteng ZHAO +1 位作者 Zhitao ZHAO Tong YIN 《ENGINEERING Structure and Civil Engineering》 SCIE EI CAS CSCD 2026年第1期178-201,共24页
Large-diameter shield tunneling in composite strata presents significant challenges due to the heterogeneous mechanical properties,posing substantial risks to excavation safety.Existing research,however,provides limit... Large-diameter shield tunneling in composite strata presents significant challenges due to the heterogeneous mechanical properties,posing substantial risks to excavation safety.Existing research,however,provides limited insights into how specific layer configurations influence soil strength,failure mechanisms,and the soil arching effect.This study aims to bridge these knowledge gaps by systematically investigating the mechanical behaviors of sand–clay and sand–pebble composites,as well as their excavation-induced responses.Methodologically,we integrate laboratory triaxial tests on reconstituted composite specimens with 3-dimensional(3D)finite element simulations of the tunneling process.Key contributions of this work include:1)the identification of a critical clay layer thickness(20–40 mm)that governs the transition from interfacial slippage to bulging failure in sand–clay composites;2)the quantification of a progressive strength reduction(up to 14.52%)in sand–pebble composites as the sand layer shifts downward;and 3)a novel comparative analysis using a soil stress coefficient method,which reveals a more extensive destruction zone and a more fragile soil arching effect in sand–pebble strata,thereby indicating an elevated risk of collapse.These findings provide crucial insights into the performance of large-diameter shield tunnels in complex geological conditions and offer guidance for safer design and operational control. 展开更多
关键词 large-diameter shield tunneling composite strata laboratory triaxial test numerical simulation mechanical property excavation response
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Intelligent segment typesetting in shield tunneling based on artificial neural networks and transfer learning 认领 引用
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作者 Rui LIU Quanyong ZENG +1 位作者 Haibo XIE Guoli ZHU 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS CSCD 2026年第3期200-214,共15页
Shield tunneling is the method most commonly used for underground projects.Segment typesetting,which involves determining the optimal assembly point for each segment ring and sequentially assembling them into a comple... Shield tunneling is the method most commonly used for underground projects.Segment typesetting,which involves determining the optimal assembly point for each segment ring and sequentially assembling them into a complete tunnel,is a critical step in shield tunneling.Currently,this typesetting process relies heavily on the operator’s experience at construction sites,which does not guarantee quality.Furthermore,research focuses mainly on the commonly used 16-point segment typesetting,largely ignoring other segment types.In addition,the reliability of these studies in site applications remains unsatisfactory.To address these issues,we propose an intelligent method for segment typesetting using an artificial neural network(ANN)and transfer learning.Due to insufficient historical data for ANN training,a dataset creation method was devised based on the Monte Carlo method and manual annotation.An ANN model was then developed to typeset 16-point segments,with its hyperparameters optimized through Bayesian optimization.Subsequently,the trained model was adapted to other segment types via transfer learning,using 10-point segments as a case study.Based on the test set established in this study,our proposed method showed superior performance compared with several commonly used machine learning methods and a representative and well-validated segment typesetting method.It was also validated using real data collected from construction sites,achieving an accuracy of 93.75%for 16-point segments and 91.43%for 10-point segments,both of which significantly surpass the results from manual typesetting on-site.The proposed method achieves accurate,rapid,and intelligent segment typesetting,which is adaptable to various segment types. 展开更多
关键词 Shield tunneling Segment typesetting Assembly points Artificial neural network(ANN) Bayesian optimization Transfer learning
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A Rectifier Bridge Circuit Based on Metal-semiconductor-metal Fin Tunneling Diode for High-frequency Application 认领 引用 被引量：1
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作者 DENG Hengyang QIN Cuijie +5 位作者 HAO Shenglan FENG Guangdi ZHU Qiuxiang TIAN Bobo CHU Junhao DUAN Chungang 《无机材料学报》 SCIE EI CAS CSCD 北大核心 2026年第2期253-261,共9页
Tunneling diodes hold significant promise for future rectification in the terahertz(THz)and visible light spectra,thanks to their femtosecond-scale transit-time tunneling capabilities.In this work,TiN/ZnO/Pt fin tunne... Tunneling diodes hold significant promise for future rectification in the terahertz(THz)and visible light spectra,thanks to their femtosecond-scale transit-time tunneling capabilities.In this work,TiN/ZnO/Pt fin tunneling diodes(FTDs)with tunneling distances of 10 and 5 nm are fabricated,which demonstrate remarkable characteristics,including ultrahigh asymmetry(1.6×104for 10 nm device and 1.6×103 for 5 nm device),high responsivity(25.3 V-1 for 10 nm device and 28.3 V-1 for 5 nm device)at zero bias,surpassing the thermal voltage limit of conventional Schottky diodes,and low turn-on voltage(Von)of approximately 100 mV for both devices,making them ideal for power conversion applications.Using technology computer-aided design(TCAD)simulations,the observed asymmetry in electronic transport is attributed to the transition between Fowler-Nordheim tunneling(FNT)and trap-assisted tunneling(TAT)under different biasing conditions,as illustrated by the corresponding energy band profiles.Furthermore,by integrating the FTDs,a rectifier bridge circuit is designed and exhibits full-wave rectification behavior,validated through SPICE simulations for THz-band operations.This advancement offers a highly efficient solution for THz-band energy conversion and effective detection applications. 展开更多
关键词 fin tunneling diode TCAD simulation rectifier bridge SPICE simulation
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Experimental and theoretical investigation of face failure and ground collapse during slurry pressure-balanced shield tunneling in saturated sand 认领 引用
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作者 Mengzhe Huo Weizhong Chen +3 位作者 Jingqiang Yuan Yunfa Li Yubiao Liu Qun Sui 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第2期1320-1336,共17页
Shield tunneling in saturated ground poses challenges due to the potential risk of ground collapse resulting from seepage force and inadequate support pressure.This study employed a laboratory model test and a theoret... Shield tunneling in saturated ground poses challenges due to the potential risk of ground collapse resulting from seepage force and inadequate support pressure.This study employed a laboratory model test and a theoretical validation to elucidate the mechanisms of face failure and subsequent ground collapse in saturated ground during slurry pressure-balanced shield(SPBS)tunneling operations.A slurry circulation system was developed to ensure steady shield tunneling and to replicate the phenomena of ground collapse.Investigations into shield tunneling parameters and ground responses,including soil pressure,pore water pressure,and surface subsidence,were conducted to understand the mechanisms of face failure and subsequent ground collapse.The theoretical solution for the critical collapse pressure of the tunnel face,based on the rotational failure mechanism,was validated through the comparison with the experimentally determined critical collapse pressure.The results indicate that:(1)appropriate adjustments of tunneling parameters are crucial for promoting filtercake formation,maintaining chamber pressure,and minimizing ground subsidence;(2)chamber pressure,soil pressure,pore water pressure,and ground subsidence are closely correlated with shield tunneling parameters and the formation of filter cake;(3)ground collapse follows a continuous failure mode due to the destruction of filtercake and the decrease in chamber pressure;(4)the soil pressure at the cutterhead is more sensitive to disturbances from shield tunneling than chamber pressure;and(5)experimentally determined critical collapse pressures is consistent with the theoretical solution of limit analysis. 展开更多
关键词 Slurry shield model test Saturated sand Ground collapse Tunnel face stability Rotational failure mechanism
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TBM big data preprocessing method in machine learning and its application to tunneling 认领 引用 被引量：1
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作者 Xinyue Zhang Xiaoping Zhang +3 位作者 Quansheng Liu Weiqiang Xie Shaohui Tang Zengmao Wang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第8期4762-4783,共22页
The big data generated by tunnel boring machines(TBMs)are widely used to reveal complex rock-machine interactions by machine learning(ML)algorithms.Data preprocessing plays a crucial role in improving ML accuracy.For ... The big data generated by tunnel boring machines(TBMs)are widely used to reveal complex rock-machine interactions by machine learning(ML)algorithms.Data preprocessing plays a crucial role in improving ML accuracy.For this,a TBM big data preprocessing method in ML was proposed in the present study.It emphasized the accurate division of TBM tunneling cycle and the optimization method of feature extraction.Based on the data collected from a TBM water conveyance tunnel in China,its effectiveness was demonstrated by application in predicting TBM performance.Firstly,the Score-Kneedle(S-K)method was proposed to divide a TBM tunneling cycle into five phases.Conducted on 500 TBM tunneling cycles,the S-K method accurately divided all five phases in 458 cycles(accuracy of 91.6%),which is superior to the conventional duration division method(accuracy of 74.2%).Additionally,the S-K method accurately divided the stable phase in 493 cycles(accuracy of 98.6%),which is superior to two state-of-the-art division methods,namely the histogram discriminant method(accuracy of 94.6%)and the cumulative sum change point detection method(accuracy of 92.8%).Secondly,features were extracted from the divided phases.Specifically,TBM tunneling resistances were extracted from the free rotating phase and free advancing phase.The resistances were subtracted from the total forces to represent the true rock-fragmentation forces.The secant slope and the mean value were extracted as features of the increasing phase and stable phase,respectively.Finally,an ML model integrating a deep neural network and genetic algorithm(GA-DNN)was established to learn the preprocessed data.The GA-DNN used 6 secant slope features extracted from the increasing phase to predict the mean field penetration index(FPI)and torque penetration index(TPI)in the stable phase,guiding TBM drivers to make better decisions in advance.The results indicate that the proposed TBM big data preprocessing method can improve prediction accuracy significantly(improving R2s of TPI and FPI on the test dataset from 0.7716 to 0.9178 and from 0.7479 to 0.8842,respectively). 展开更多
关键词 Tunnel boring machine Big data preprocessing Division of tunneling cycle Tunneling resistance Machine learning
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Formulation,Properties and Mechanism of a New Expanding Agent-activated Backfill Grouting Material for Shield Tunneling 认领 引用
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作者 ZHANG Chiyu ZHANG Jianfeng +4 位作者 LI De MIN Fanlu SHEN Chen ZHANG Yazhou YAO Zhanhu 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2026年第3期805-819,共15页
In the process of backfill grouting for shield tunneling,the hardening and shrinkage of the slurry can easily lead to ground settlement,whereas the secondary grouting prolongs the construction period and increases the... In the process of backfill grouting for shield tunneling,the hardening and shrinkage of the slurry can easily lead to ground settlement,whereas the secondary grouting prolongs the construction period and increases the engineering cost generally.In this study,a new but low-cost strategy to resist the shrinkage of backfill grouting using calcium a sulphoaluminate micro-expansion agent(CAS-H)is innovatively proposed.With the addition of CAS-H at 8%and 20%,the lateral expansion rate of the backfill grouting increased to 1%and 3%at 28 d,respectively.On the contrary,that of the backfill grouting without CAS-H was only about-4%.Simultaneously,CAS-H also increased the density and the impermeability of the hardened slurry significantly.Other essential properties such as the bleeding rate,setting time,fluidity,consistency,strength after hardening and other indicators of the backfill grouting still satisfied the related engineering standards.From the perspective of microstructure,the appearance of C-S-H gel,C4AH13,Aft,Afm and Ca(OH)2 was accelerated by CASH,filling the pores and making the microstructure denser.The hydration heat curve and thermodynamic simulation(GEMS)further validated the other essential beneficial effects of CAS-H,and the cumulative hydration heat of 72 h was calculated to be increased by 29.6%.The hydration degree of cement clinker(C3S,C2S,C3A,C4AF,etc)also increased,which was believed the key reason for inhibiting the shrinkage of the background grouting using the expansion agent-activated strategy. 展开更多
关键词 expanding agent backfill grouting shield tunnelling impermeability microstructure.
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Simultaneous treatment of concomitant achalasia coexisting with epiphrenic diverticulum:The practice of submucosal tunneling technique 认领 引用
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作者 Xin-Wei Hao Ya-Wei Bi +6 位作者 Zi-Meng Wang Xiao-Tong Niu Jing-Yuan Xiang Song Su Long-Song Li En-Qiang Linghu Ning-Li Chai 《World Journal of Gastroenterology》 SCIE CAS 2026年第9期51-61,共11页
BACKGROUND Esophageal epiphrenic diverticulum(ED)often occurs in patients with esophageal motility disorders,and its incidence rate is approximately 3%-7%in achalasia(AC).A distinct septum has been observed in some pa... BACKGROUND Esophageal epiphrenic diverticulum(ED)often occurs in patients with esophageal motility disorders,and its incidence rate is approximately 3%-7%in achalasia(AC).A distinct septum has been observed in some patients with AC coexisting with ED during gastroscopy.Digestive endoscopic tunnel technique has emerged as a promising therapeutic approach for these patients.AIM To evaluate the therapeutic effectiveness of specific treatment methods for ED with septum(ED+S)or ED without septum(ED-S)in AC patients.METHODS This retrospective cohort study included 31 patients with AC and esophageal diverticula(21 patients with septum and 10 patients without septum)between January 2016 and January 2025.In ED+S group,submucosal tunneling myotomy combined with diverticular septotomy was performed,while patients in the ED-S group underwent submucosal myotomy alone.The Eckardt scores before and after surgery were compared to evaluate symptom relief and clinical success.The Gastroesophageal Reflux Disease Questionnaire(GERD-Q)score and gastroscopy findings were used to evaluate postoperative gastroesophageal reflux.RESULTS The corresponding operation steps were completed in both groups,with a technical success rate of 100%.We successfully followed up with 18 and 10 patients in the ED+S and ED-S group,with a median follow-up period of 2.5 years and 3.0 years,respectively.The postoperative Eckardt scores[median(interquartile range)]were significantly lower in both groups compared with preoperative scores[ED+S group:6.0(4.0-8.0)vs 0(0-2.0),P<0.05;ED-S group:6.0(3.75-8.25)vs 1.0(0-3.0),P<0.05].The clinical success rates(Eckardt score≤3)were 88.9%and 90.0%,respectively.The GERD-Q score was used to evaluate postoperative gastroesophageal reflux,and 3 patients(3/18,16.7%)in ED+S group and 2 patients(2/10,20%)in ED-S group experienced symptomatic reflux(GERD-Q score≥8).CONCLUSION In AC patients with ED+S,submucosal tunneling myotomy with diverticular septotomy can achieve good therapeutic effects.When there is no obvious septum,submucosal tunneling myotomy is an effective method. 展开更多
关键词 Achalasia Esophageal diverticulum Per-oral endoscopic myotomy Blown-out myotomy Digestive endoscopic tunnel technique
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Tunneling Magnetoresistance Effect in Altermagnetic Tunnel Junctions with g-Wave Splitting 认领 引用
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作者 Xinlu Li Meng Zhu +3 位作者 Jianting Dong Kun Wu Fanxing Zheng Jia Zhang 《Chinese Physics Letters》 SCIE EI CAS CSCD 2025年第10期144-165,共22页
Altermagnets,a class of unconventional antiferromagnets with non-relativistic spin-splitting,offer promising potential for antiferromagnetic spintronic devices.While many altermagnets are limited by either low magneti... Altermagnets,a class of unconventional antiferromagnets with non-relativistic spin-splitting,offer promising potential for antiferromagnetic spintronic devices.While many altermagnets are limited by either low magnetic transition temperatures or weak spin splitting,the recently discovered metal CrSb,with high N′eel temperature(TN=710 K)and significant spin-splitting due to its unique spin space group,provides a robust platform for remarkable tunneling magnetoresistance(TMR)in collinear all-antiferromagnetic tunnel junctions(AATJs).This study systematically investigates the spin-polarized Fermi surface of CrSb and spin-dependent electron transport in CrSb-based AATJs.The CrSb/β-InSe/CrSb junction with a three-monolayer InSe barrier exhibits a TMR ratio of approximately 290%,with energy-dependent analysis revealing TMR ratios that may exceed 850%when considering the shift of the Fermi energy.We also demonstrate the angle-dependent TMR of CrSb-based AATJs by adjusting N′eel vector orientations.Our findings might provide strong theoretical support for CrSb as a versatile building block for all-antiferromagnetic memory devices. 展开更多
关键词 G wave splitting antiferromagnetic spintronic deviceswhile tunneling magnetoresistance tmr Alt magnets low magnetic transition temperatures spin splittingthe tunneling magnetoresistance Crsb
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Deformation analysis of ground and existing tunnel induced by overlapped curved shield tunneling 认领 引用 被引量：3
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作者 Yingnan Liu Huayang Lei +2 位作者 Liang Shi Gang Zheng Mengting Wang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第2期795-809,共15页
The deformation caused by tunnel excavation is quite important for safety,especially when it is adjacent to the existing tunnel.Nevertheless,the investigation of deformation characteristics in overlapped curved shield... The deformation caused by tunnel excavation is quite important for safety,especially when it is adjacent to the existing tunnel.Nevertheless,the investigation of deformation characteristics in overlapped curved shield tunneling remains inadequate.The analytical solution for calculating the deformation of the ground and existing tunnel induced by overlapped curved shield tunneling is derived by the Mirror theory,Mindlin solution and Euler-Bernoulli-Pasternak model,subsequently validated through both finite element simulation and field monitoring.It is determined that the overcutting plays a crucial role in the ground settlement resulting from curved shield tunneling compared to straight shield tunneling.The longitudinal settlement distribution can be categorized into five areas,with the area near the tunnel surface experiencing the most dramatic settlement changes.The deformation of the existing tunnel varies most significantly with turning radius compared to tunnel clearance and grouting pressure,especially when the turning radius is less than 30 times the tunnel diameter.The tunnel crown exhibits larger displacement than the tunnel bottom,resulting in a distinctive‘vertical egg'shape.Furthermore,an optimized overcutting mode is proposed,involving precise control of the extension speed and angular velocity of the overcutting cutter,which effectively mitigates ground deformation,ensuring the protection of the existing tunnel during the construction. 展开更多
关键词 Overlapped curved shield tunneling Analytical solution Ground deformation Existing tunnel Overcutting mode
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Resonant tunneling diode cellular neural network with memristor coupling and its application in police forensic digital image protection 认领 引用 被引量：2
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作者 Fei Yu Dan Su +3 位作者 Shaoqi He Yiya Wu Shankou Zhang Huige Yin 《Chinese Physics B》 SCIE EI CAS CSCD 2025年第5期289-301,共13页
Due to their biological interpretability,memristors are widely used to simulate synapses between artificial neural networks.As a type of neural network whose dynamic behavior can be explained,the coupling of resonant ... Due to their biological interpretability,memristors are widely used to simulate synapses between artificial neural networks.As a type of neural network whose dynamic behavior can be explained,the coupling of resonant tunneling diode-based cellular neural networks(RTD-CNNs)with memristors has rarely been reported in the literature.Therefore,this paper designs a coupled RTD-CNN model with memristors(RTD-MCNN),investigating and analyzing the dynamic behavior of the RTD-MCNN.Based on this model,a simple encryption scheme for the protection of digital images in police forensic applications is proposed.The results show that the RTD-MCNN can have two positive Lyapunov exponents,and its output is influenced by the initial values,exhibiting multistability.Furthermore,a set of amplitudes in its output sequence is affected by the internal parameters of the memristor,leading to nonlinear variations.Undoubtedly,the rich dynamic behaviors described above make the RTD-MCNN highly suitable for the design of chaos-based encryption schemes in the field of privacy protection.Encryption tests and security analyses validate the effectiveness of this scheme. 展开更多
关键词 memristor hyperchaos resonant tunneling diode-based cellular neural network(RTD-CNN) dynamic analysis image encryption
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Modification of Maxwell model for conductivity prediction of carbon nanotubes-filled polymer composites with tunneling effect 认领 引用 被引量：1
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作者 Jue ZHU Longyuan LI Ningtao ZHU 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2025年第1期25-36,共12页
Carbon nanotubes(CNTs)have garnered great attention in recent years due to their outstanding electrical,thermal,and mechanical properties.The incorporation of small amounts of CNTs in polymers can substantially improv... Carbon nanotubes(CNTs)have garnered great attention in recent years due to their outstanding electrical,thermal,and mechanical properties.The incorporation of small amounts of CNTs in polymers can substantially improve the sensitivity of the polymer's electrical conductivity.This paper presents a modified Maxwell model to evaluate the electrical conductivity of CNTs-filled polymer composites by introducing a transition zone to account for the tunneling effect.In this modified Maxwell model,the CNTs-filled polymer composite is modeled as a three-phase composite,consisting of a matrix(polymer),inclusions(CNTs),and a transition zone(tunneling zone).The effective electrical conductivity(EEC)of the composite is calculated based on the volume fractions and electrical conductivities of the matrix,inclusions,and transition zone.The model's validity is confirmed through the use of available test data,which demonstrates its capability to accurately capture the nonlinear conductivity behavior observed in CNTs-polymer composites.This study offers valuable insights into the design of high-performance conductive polymer nanocomposites,and enhances the understanding of electrical conduction mechanisms in CNT-dispersed polymer composites. 展开更多
关键词 carbon nanotube(CNT) polymer composite electrical conductivity tunneling Maxwell model
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A new minimally invasive glaucoma surgery namely trabeculotome tunneling trabeculoplasty for steroidinduced glaucoma:a case report 认领 引用
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作者 Qin Qiu Chang-Zhu He +3 位作者 Su-Zhen Wang Su-Ju Liu Zheng-Fang Wu Liu-Zhi Zeng 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2025年第12期2394-2396,共3页
Dear Editor,We present the reported case of steroid-induced glaucoma(SIG)treated by trabeculectome tunneling trabeculoplasty(3T).The 3T procedure is a new minimally invasive glaucoma surgery designed to protect and en... Dear Editor,We present the reported case of steroid-induced glaucoma(SIG)treated by trabeculectome tunneling trabeculoplasty(3T).The 3T procedure is a new minimally invasive glaucoma surgery designed to protect and enhance the function of the trabecular meshwork(TM)while reducing resistance to outflow of atrial fluid[1].A 20-year-old male patient experienced an elevation in intraocular pressure(IOP)and subsequently progressed to SIG after continuously using tobramycin-dexamethasone eyedrops for one year.Trabeculotomy of the right eye was performed. 展开更多
关键词 steroid induced glaucoma protect enhance function tunneling trabeculoplasty minimally invasive glaucoma surgery trabeculectome tunneling trabeculoplasty t trabeculotome elevation intraocular trabecular meshwork tm
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Molecular conformational effects on co-assembly systems of low-symmetric carboxylic acids investigated by scanning tunneling microscopy 认领 引用
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作者 Yutong Xiong Ting Meng +3 位作者 Wendi Luo Bin Tu Shuai Wang Qingdao Zeng 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2025年第2期57-61,共5页
The assembly behaviors of two low-symmetric carboxylic acid molecules(50-(6-carboxynaphthalen-2-yl)-[1,10:30,100-triphenyl]-3,400,5-tricarboxylic acid(CTTA)and 30,50-bis(6-carboxynaphthalen-2-yl)-[1,10-biphenyl]-3,5-d... The assembly behaviors of two low-symmetric carboxylic acid molecules(50-(6-carboxynaphthalen-2-yl)-[1,10:30,100-triphenyl]-3,400,5-tricarboxylic acid(CTTA)and 30,50-bis(6-carboxynaphthalen-2-yl)-[1,10-biphenyl]-3,5-dicarboxylic acid(BCBDA))containing naphthalene rings on graphite surfaces have been investigated using scanning tunneling microscopy(STM).The transformation of nanostructures induced by the second components(EDA and PEBP-C4)have been also examined.Both CTTA and BCBDA molecules self-assemble at the 1-heptanoic acid(HA)/HOPG interface,forming porous network structures.The dimer represents the most elementary building unit due to the formation of double hydrogen bonds.Moreover,the flipping of naphthalene ring results in the isomerization of BCBDA molecule.The introduction of carboxylic acid derivative EDA disrupts the dimer,which subsequently undergoes a structural conformation to form a novel porous structure.Furthermore,upon the addition of pyridine derivative PEBP-C4,N–H⋯O hydrogen bonds are the dominant forces driving the three coassembled structures.We have also conducted density functional theory(DFT)calculations to determine the molecular conformation and analyze the mechanisms underlying the formation of nanostructures. 展开更多
关键词 Co-assembly Conformation Hydrogen bonds Scanning tunneling microscopy DFT calculations
Spatial electron tunneling leads to space-charge-limited current in organic hole transport materials 认领 引用
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作者 Shaofeng Chen Yanfei Lu +1 位作者 Dongcheng Chen Shi-Jian Su 《Chinese Physics B》 SCIE EI CAS CSCD 2025年第7期587-594,共8页
The injection of electrical charge from an electrode into organic semiconductors directly influences the performance of organic optoelectronic devices.However,our understanding of the mechanisms behind charge injectio... The injection of electrical charge from an electrode into organic semiconductors directly influences the performance of organic optoelectronic devices.However,our understanding of the mechanisms behind charge injection remains incomplete.In this study,we explored the hole injection from an indium tin oxide(ITO)electrode into a hole transport layer(HTL)by employing various organic interlayers(ILs)with different ionization potentials(IPs).It was demonstrated that using O2plasma treatment onto an ITO surface and incorporating an interlayer(IL)with a higher IP between the ITO electrode and the HTL can substantially increase the hole current density.This improvement leads to the achievement of barrier-free injection and the establishment of space-charge-limited current.We propose two synergistic mechanisms of spatial electron tunneling that govern the injection characteristics:electron tunneling from the HTL across the IL to the electrode that establishes an electrostatic equilibrium with a zero-injection barrier and an electric-field-induced spatial tunneling effect that occurs during device operation with applying bias.This research offers a strategy to achieve spacecharge-limited hole current and provides an explanatory framework for understanding the underlying physics of charge injection. 展开更多
关键词 organic semiconductor spatial electron tunneling hole injection indium tin oxide work function
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Four-Phonon Scattering and Wave-Like Phonon Tunneling Drive Glassy Ultralow Lattice Thermal Conductivity in Cs2AgInCl6 认领 引用
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作者 Rongrong Ma Xiaoxiao Zhang +3 位作者 Shiqi Guo Mei Ge Junfeng Zhang Jiangjiang Ma 《Chinese Physics Letters》 SCIE EI CAS CSCD 2025年第9期214-223,共10页
Lead-free halide double perovskites(HDPs)provide a promising platform for high-performance thermoelectric due to their intrinsically ultralow lattice thermal conductivity kl.In this study,we comprehensively investi... Lead-free halide double perovskites(HDPs)provide a promising platform for high-performance thermoelectric due to their intrinsically ultralow lattice thermal conductivity kl.In this study,we comprehensively investigate the lattice dynamics of Cs2AgInCl6using first-principles calculations.By explicitly incorporating four-phonon scattering and wave-like phonon tunneling,we predict a klof 0.52 W·m-1·K-1with a remarkably weak temperature dependence(kl∝T-0.31),confirming the intrinsically glass-like ultralow klin Cs2AgInCl6.Further analyses reveal that hierarchical chemical bonds,loosely bonded rattling atoms and a mixed crystalline-liquid state collectively induce strong anharmonicity manifested in flat phonon modes.These factors dominate the glass-like thermal transport component of kl.This work uncovers the underlying mechanisms governing the unusual thermal transport properties in lead-free HDPs and offers guiding principles for designing novel energy conversion technologies. 展开更多
关键词 lead free halide double perovskites four phonon scattering Cs AgInCl double perovskites hdps provide lattice dynamics wave phonon tunneling glassy ultralow lattice thermal conductivity ultralow lattice thermal conductivity
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Impact of disc-cutter partial wear on tunneling parameters and a high-accuracy method for discrimination of partial wear 认领 引用 被引量：1
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作者 Xinghai ZHOU Yakun ZHANG +1 位作者 Guofang GONG Huayong YANG 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS CSCD 2025年第4期359-375,共17页
In tunnel construction with tunnel boring machines(TBMs),accurate knowledge of disc-cutter failure states is crucial to ensure efficient operation and prevent delays and cost overruns.This study investigates the influ... In tunnel construction with tunnel boring machines(TBMs),accurate knowledge of disc-cutter failure states is crucial to ensure efficient operation and prevent delays and cost overruns.This study investigates the influence of disc-cutter partial wear on tunneling parameters and proposes a novel method for discriminating partial-wear ratio based on a stacking ensemble model.The time-domain features of torque and thrust,including the average value and standard deviation,are analyzed through a series of scaled-down experimental tests on partial wear.Torque and thrust values will increase when a disc cutter is trapped and partially worn.The impact of partial-wear ratio on tunneling parameters appears to be more significant than partial-wear depth.A total of 40 features are selected from the time domain,frequency domain,and time-frequency domain to describe the torque and thrust.The relationships between these features and the partial-wear ratio are analyzed using the Pearson coefficient and Copula entropy.The results reveal that,except for the form factor in the time-domain features,the remaining features exhibit certain linear or non-linear correlations with the partial-wear ratio.Lastly,the proposed model successfully achieves the discrimination of the partial-wear ratio and outperforms other commonly used models in terms of overall classification accuracy and differentiation capability in different categories.This research provides effective support for monitoring and health management of disc-cutter failure states. 展开更多
关键词 Tunnel boring machine(TBM) Disc cutter Partial wear Tunneling parameters Multi-domain features Ensemble learning
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