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Numerical analysis of loess and weak intercalated layer failure behavior under direct shearing and cyclic loading

Journal of Mountain Science 2020年第11期17卷 2796-2815页

作者： ZHANG ze-lin WANG Tao College of Water Resources and Civil Engineering China Agricultural UniversityBeijing 100083China Institute of Geomechanics Chinese Academy of Geological SciencesBeijing 100081China

The mechanical behavior of the joints inside a loess layer is greatly important in weak intercalation studies owing to its involvement in a wide range of landslides in the loess region in *** shear behavior of the joints in the loess stratum during direct shear and cyclic loadings was investigated using the PFC2D discrete element *** mudstone and mudstone with weak intercalated layer materials were subjected to direct testing,and cyclic shear tests were conducted with consideration to the influence of normal stress and shear *** macroscopic properties and damage patterns were obtained for six numerical configurations;namely,loess-weathered mudstone with 0°,10°,and-10°joints and weathered mudstone with 0°,10°,and-10°weak intercalated *** numerical test results revealed that,in the direct shear tests,the shear stress and shear displacement of the samples increased with the normal *** the cyclic shear tests with a total cycle number N=20,the shear stress-shear strain curve of the six different configurations exhibited a hysteresis *** numerical tests also revealed that,under cyclic shear,the normal stress and shear velocity affected the shear *** degree of damage increased as the shear velocity decreased from 0.1 mm/s to 0.005 mm/s for all six numerical *** with the damage pattern of the direct shear tests,the damage of the cyclic shear tests mainly comprised shear cracks and fractures,some shaking consolidation settlement and fewer shear strain occurred around the *** the direct shear tests,more compression cracks and fractures occurred in the *** damage mainly developed along the joints,and shearing-off damage *** results obtained by this study further elucidate the failure mechanism and microscopic damage response of the joints in the loess stratum in Northwest China.

关键词： Loess Mudstone Weak intercalated layer Direct shear test Cyclic shear test PFC2D

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Stability and deformation of Xiaozhuang landslide: A large-scale creeping landslide in Gansu, China

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Journal of Mountain Science 2022年第3期19卷 756-770页

作者： ZHANG ze-lin WANG Tao China Agricultural University Beijing 100083China Institute of Geomechanics Chinese Academy of Geological SciencesBeijing 100081China

Information about the long-term spatiotemporal evolution of landslides can improve our understanding of the landslide development process and can help prevent landslide *** paper describes the Xiaozhuang landslide triggered by a historical earthquake and rainfall in Tianshui,Northwest *** landslide is dominated by rotational-sliding *** new failures and many fissures formed in the landslide area as a result of the 2013 Ms 6.6 Minxian earthquake and ***,field investigations,borehole drilling,geotechnical laboratory tests,and numerical calculations were conducted to study the mechanism of the landslide and to forecast its stability.A triaxial creep test of the slip soil indicates that the axial deformation of the mudstone increases with increasing water *** simulations suggest that failure is prone to occur within the deep part of the landslide under earthquake *** the input seismic acceleration exceeds 0.2 g,the landslide will become ***,the horizontal peak ground acceleration near the surface of the landslide is greater than that at *** a strong earthquake,the unstable regions are primarily located in the middle of the landslide and at its *** the rainfall intensity rate is 200 mm/d,the factor of safety is 1.319 and a dangerous zone appears in the lower and middle parts of the landslide.

关键词： Landslide Stability Rainfall and earthquake Numerical simulation Acceleration Displacement

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Strong coupling between height of gaps and thickness of thermal boundary layer in partitioned convection system

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Chinese Physics B 2019年第9期28卷 270-275页

作者： ze-Peng lin Yun Bao Department of Mechanics Sun Yat-Sen University

A direct numerical simulation(DNS) method is used to calculate the partitioned convection system with Ra number ranging from 10^7 to 2×10^*** the boundary layer thickness to normalize the height of gaps d, we find a strong consistency between the variation of the TD number(the average value of the temperature in each heat transfer channel is averaged after taking the absolute values) with the change of the height of gaps and the variation of the TD number with the change of Ra number in partitioned *** a given thickness of partition, heights of gaps are approximately equal to 0.5 or 1 time of the thermal boundary layer thickness λθ at different Ra *** number representing temperature characteristics is almost the constant value, which means that TD number is a function of d/λθ *** of local temperature field of area in gaps shows that the temperature distribution in the gaps are basically the same when d/λθ is *** heat transfer Nu number of the system at d/λθ≈ 0.5 is larger than that of d/λθ≈ 1, both of them have the same scaling law with Ra number and Nu^Ra^0.25.

关键词： partitioned convection system height of gaps thermal boundary layer TD number

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Distribution and features of landslides in the Tianshui Basin, Northwest China

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Journal of Mountain Science 2020年第3期17卷 686-708页

作者： ZHANG ze-lin WANG Tao WU Shu-ren China Agricultural University Beijing 100083China Chinese Academy of Geological Sciences Institute of Geomechanics Beijing 100081China

Landslides in Tianshui Basin, Gansu Province, Northwest China, severely affect the local population and the economy;therefore,understanding their evolution and kinematics is of great interest for landslide risk assessment and prevention. However, there is no unified classification standard for the types of loess landslides in *** this study, we explored the landslide distribution and failure characteristics by means of field investigation,remotesensinginterpretation,geological mapping, drilling exploration and shearwave velocity tests, and established a database of Tianshui landslides. Our analysis shows that shear zones in mudstone usually develop in weak intercalated layers. Landslides occur mainly along the West Qinling faults on slopes with gradients of 10° to 25° and on southeast-and southwest-facing *** landslides were classified into five types: loess landslides, loess–mudstone interface landslides, loess flow-slides, loess–mudstone plane landslides and loess–mudstone cutting landslides. We discussed the evolution and failure process of each landslide type and analyzed the formation mechanism and motion characteristics of large-scale landslides. The analysis results show that the landslides in the study area are characterized by a gentle slope, long runout and high risk. The relationship between the runout L and the vertical drop H of the large-scale landslides in the study area is L > 4 H. There are good correlations between the equivalent friction coefficient of largescale landslides and their maximum height, runout,area and volume. The sliding zone of large-scale landslides often develops in the bedrock contact zone or in a weak interlayer within mudstone. From microstructure analysis, undisturbed mudstone consists mainly of small aggregates with dispersed inter-aggregate pores, whereas sheared clay has a more homogeneous structure. linear striations are well developed on shear surfaces, and the clay pores in those surfaces have a more uni

关键词： Loess Plateau Landslide distribution large-scale landslide landslide types slide distance Qinling fault

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Topological Wannier Cycles for the Bulk and Edges

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Chinese Physics Letters 2022年第8期39卷 39-46页

作者： ze-lin Kong Zhi-Kang lin Jian-Hua Jiang School of Physical Science and Technology and Collaborative Innovation Center of Suzhou Nano Science and TechnologySoochow UniversitySuzhou 215006China Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province and Key Lab of Modern Optical Technologies of Ministry of EducationSoochow UniversitySuzhou 215006China

Topological materials are often characterized by unique edge states which are in turn used to detect different topological phases in ***,with the discovery of various higher-order topological insulators,such spectral topological characteristics are extended from edge states to corner ***,the chiral symmetry protecting the corner states is often broken in genuine materials,leading to vulnerable corner states even when the higher-order topological numbers remain quantized and ***,we show that a local artificial gauge flux can serve as a robust probe of the Wannier type higher-order topological insulators,which is effective even when the chiral symmetry is *** resultant observable signature is the emergence of the cyclic spectral flows traversing one or multiple band *** spectral flows are associated with the local modes bound to the artificial gauge *** phenomenon is essentially due to the cyclic transformation of the Wannier orbitals when the local gauge flux acts on *** extend topological Wannier cycles to systems with C_(2)and C_(3)symmetries and show that they can probe both the bulk and the edge Wannier centers,yielding rich topological phenomena.

关键词： topological gauge Wannier

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Multi-View Dynamic Kernelized Evidential Clustering

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IEEE/CAA Journal of Automatica Sinica 2024年第12期11卷 2435-2450页

作者： Jinyi Xu Zuowei Zhang ze lin Yixiang Chen Weiping Ding the Software Engineering Institute East China Normal University Shanghai Key Laboratory of Trustworthy Computing East China Normal University IEEE the School of Automation Northwestern Polytechnical University the School of Artificial Intelligence and Computer Science Nantong University the Faculty of Data Science City University of Macau

It is challenging to cluster multi-view data in which the clusters have overlapping areas. Existing multi-view clustering methods often misclassify the indistinguishable objects in overlapping areas by forcing them into single clusters, increasing clustering errors. Our solution, the multi-view dynamic kernelized evidential clustering method(MvDKE), addresses this by assigning these objects to meta-clusters, a union of several related singleton clusters, effectively capturing the local imprecision in overlapping areas. MvDKE offers two main advantages: firstly, it significantly reduces computational complexity through a dynamic framework for evidential clustering, and secondly, it adeptly handles non-spherical data using kernel techniques within its objective function. Experiments on various datasets confirm MvDKE's superior ability to accurately characterize the local imprecision in multi-view non-spherical data, achieving better efficiency and outperforming existing methods in overall performance.

关键词： Evidential clustering imprecision characterizing kernel technique multi-view clustering

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Template-free synthesis of hollow carbon-based nanostructures from MOFs for rechargeable battery applications

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Science China Chemistry 2023年第1期66卷 65-77页

作者： De-Shan Bin ze-lin Zheng An-Min Cao Li-Jun Wan College of Chemistry and Materials Science Guangdong Provincial Key Laboratory of Functional Supramolecular CoordinationMaterials and ApplicationsJinan UniversityGuangzhou 510632China CAS Key Laboratory of Molecular Nanostructure and Nanotechnology Beijing National Laboratory for Molecular SciencesInstitute of ChemistryChinese Academy of Sciences(CAS)Beijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Hollow carbon-based nanostructures(HCNs)have found broad applications in various fields,particularly rechargeable ***,the syntheses of HCNs usually rely on template methods,which are time-consuming,low-yield,and environmentally ***-organic frameworks(MOFs),constructed by organic ligands and inorganic metal nodes,have been identified as effective platforms for preparing HCNs without adding extra *** review summarized the recent progress in template-free synthesis of HCNs enabled by MOFs and their applications in rechargeable *** template-free strategies were introduced first with mechanistic insights into the hollowing *** the electrochemical performances of the HCNs were discussed with highlight on the structure-function *** is found that the built-in cavities and nonporous for HCNs is of critical importance to increase the storage sites for high capacity,to enhance charge and mass transport kinetics for high-rate capability,and to ensure the resilient electrode structure for stable ***,the challenges and opportunities regarding MOFs-derived HCNs and their applications in rechargeable batteries were discussed.

关键词： hollow carbon-based nanostructures template-free synthesis metal-organic frameworks rechargeable battery electrode material

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Graph Embedding Based API Graph Search and Recommendation

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Journal of Computer Science & Technology 2019年第5期34卷 993-1006页

作者： Chun-Yang ling Yan-Zhen Zou ze-Qi lin Bing Xie Key Laboratory of High Confidence Software Technologies Ministry of EducationBeijing 100871China School of Electronics Engineering and Computer Science Peking UniversityBeijing 100871China

Searching application programming interfaces (APIs) is very important for developers to reuse software projects. Existing natural language based API search mainly faces the following challenges. 1) More accurate results are required as software projects evolve to be more heterogeneous and complex. 2) The semantic relationships between APIs (e.g., inheritances between classes, and invocations between methods) need to be illustrated so that developers can better understand their usage scenarios. To deal with these issues, we propose GeAPI, a novel graph embedding based approach for API graph search and recommendation in this paper. First, we build a software project’s API graph automatically from its source code and represent each API using graph embedding methods. Second, we search the API graph with a question in natural language, and return the corresponding subgraph that is composed of relevant code elements and their associated relationships, as the best answer of the question. In experiments, we select three well-known open source projects, JodaTime, Apache Lucene and POI, as examples to perform API search tasks. The experimental results show that our approach GeAPI improves F1-score by 10% compared with the existing shortest path based API search approach, while reduces the average response time about 60 times.

关键词： application programming interface (API) recommendation API graph graph embedding software reuse

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Recent advances towards catalytic asymmetric Conia-ene-type reactions

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Chinese Chemical Letters 2021年第3期32卷 954-962页

作者： En-ze lin Yin Xu Kegong Ji Long-Wu Ye College of Chemistry and Pharmacy Northwest A&F UniversityShaanxi Key Laboratory of Natural Products&Chemical BiologyYangling 712100China The Key Laboratory for Chemical Biology of Fujian Province and State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China State Key Laboratory of Organometallic Chemistry Chinese Academy of SciencesShanghai 200032China

Conia-ene reactions,as a type of ene reactions,have not become a remarkable focus until the beginning of21st century,when Lewis acids served as powerful catalysts and found an increasingly broad utilization in this ***,the catalytic Conia-ene reactions have gained great significance in synthetic chemistry due to their high efficiency and atom economy on the construction of valuable cyclic *** the past two decades,the rapid development of transition-metal catalysis and organocatalysis has imposed a profound impact on the exploration of asymmetric Conia-ene *** a result,several strategies have been developed and applied *** on the basis of the catalytic system,this review comprehensively presents a summary of recent progress achieved in this emerging domain,aimed at highlighting the reactions’features,practicalities,and the mechanistic rationale is presented where possible.

关键词： Conia-ene reaction Asymmetric catalysis Transition metals Organocatalysts

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TOAST: Automated Testing of Object Transformers in Dynamic Software Updates

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Journal of Computer Science & Technology 2022年第1期37卷 50-66页

作者： ze-lin Zhao Di Huang Xiao-Xing Ma State Key Laboratory for Novel Software Technology Nanjing UniversityNanjing 210023China

Dynamic software update(DSU)patches programs on the *** often involves the critical task of object transformation that converts live objects of the old-version program to their semantically consistent counterparts under the new-version *** task is accomplished by invoking an object transformer on each stale ***,a defective transformer failing to maintain consistency would cause errors or even crash the *** propose TOAST(Test Object trAnSformaTion),an automated approach to detecting potential inconsistency caused by object *** first analyzes an update to identify multiple target methods and then adopts a fuzzer with specially designed inconsistency guidance to randomly generate object states to drive two versions of a target *** creates two corresponding execution traces and a pair of old and new *** finally performs object transformation to create a transformed object and detects inconsistency between it and the corresponding new object produced from scratch by the new ***,TOAST checks behavior inconsistency by comparing the return variables and exceptions of the two *** evaluation on 130 updates with default transformers shows that TOAST is promising:it got 96.0%precision and 85.7%recall in state inconsistency detection,and 81.4%precision and 94.6%recall in behavior inconsistency *** inconsistency guidance improved the fuzzing efficiency by 14.1%for state inconsistency detection and 40.5%for behavior inconsistency detection.

关键词： object state transformer inconsistency detection dynamic software update(DSU) fuzzing testing

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