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Acta Geologica Sinica(English Edition) 2015年第6期89卷 1835-1846页

作者： yang wentao WANG Min QI Yong'an Institute of Resources and Environment Henan Polytechnic University

Soft-sediment deformation structures are abundant in the Cambrian Zhushadong and Mantou formations of the Dengfeng area, Henan Province, China. Soft-sediment deformation structures of the Zhushadong Formation consist of fluidized deformation, synsedimentary faults, seismo-folds and plastic deformation; the Mantou Formation is dominated by small-scale horst faults, intruded dikes, fluidized veins, and seismo-cracks. These structures are demonstrated to be earthquake-related by analysis of trigger mechanisms, and may indicate the activity of the Qinling tectonic belt during the early Cambrian. Furthermore, the assemblages of soft-sediment deformation structures altered with time： large-scale, intense deformation in the Zhushadong Formation alters to small-scale, weak deformation in the Mantou Formation. This striking feature may have been caused by changes in hypocentral depth from deep-focus to shallow-focus earthquakes, indicating that the Qinling tectonic belt developed from the subduction of the Shangdan Ocean to the extension of the Erlangping back-arc basin. This study suggests that soft-sediment deformation structures can be used to reveal the activity of a tectonic belt, and, more importantly, changes in deformation assemblages can track the evolution of a tectonic belt.

关键词： soft-sediment deformation structures seismites Qinling tectonic belt Cambrian,Southern North China Block

A Heterogeneous Sampling Strategy to Model Earthquake‑Triggered Landslides

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International Journal of Disaster Risk Science 2023年第4期14卷 636-648页

作者： Hui yang Peijun Shi Duncan Quincey Wenwen Qi wentao yang School of Soil and Water Conservation Beijing Forestry UniversityBeijing 100083China State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijing 100875China Academy of Disaster Reduction and Emergency Management Ministry of Emergency Management and Ministry of EducationBeijing Normal UniversityBeijing 100875China Faculty of Geographical Science Beijing Normal UniversityBeijing 100875China School of Geography University of LeedsLeeds LS29JTUK National Institute of Natural Hazards Beijing 100085China Academy of Plateau Science and Sustainability People’s Government of Qinghai Province and Beijing Normal UniversityXining 810016China

Regional modeling of landslide hazards is an essential tool for the assessment and management of risk in mountain *** studies that have focused on modeling earthquake-triggered landslides report high prediction ***,it is common to use a validation strategy with an equal number of landslide and non-landslide samples,scattered homogeneously across the study ***,there are overestimations in the epicenter area,and the spatial pattern of modeled locations does not agree well with real *** order to improve landslide hazard mapping,we proposed a spatially heterogeneous non-landslide sampling strategy by considering local ratios of landslide to non-landslide *** landslides triggered by the 2008 Wenchuan Earthquake on the eastern Tibetan Plateau were used as an *** assess the performance of the new strategy,we trained two random forest models that shared the same *** frst was trained using samples from the new heterogeneous strategy,and the second used the traditional *** each case the spatial match between modeled and measured(interpreted)landslides was examined by scatterplot,with a 2 km-by-2 km *** the traditional approach achieved higher AUC_(ROC)(0.95)accuracy than the proposed one(0.85),the coefcient of determination(R^(2))for the new strategy(0.88)was much higher than for the traditional strategy(0.55).Our results indicate that the proposed strategy outperforms the traditional one when comparing against landslide inventory *** work demonstrates that higher prediction accuracies in landslide hazard modeling may be deceptive,and validation of the modeled spatial pattern should be *** proposed method may also be used to improve the mapping of precipitation-induced *** of the proposed strategy could beneft precise assessment of landslide risks in mountain environments.

关键词： Earthquake-triggered landslides Landslide hazard modeling Machine learning Model validation Sampling strategy Tibetan Plateau

Identify Landslide Precursors from Time Series InSAR Results

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International Journal of Disaster Risk Science 2023年第6期14卷 963-978页

作者： Meng Liu wentao yang Yuting yang Lanlan Guo Peijun Shi School of Soil and Water Conservation Beijing Forestry UniversityBeijing 100083China State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijing 100875China Academy of Disaster Reduction and Emergency Management Ministry of Emergency Management and Ministry of EducationBeijing Normal UniversityBeijing 100875China Faculty of Geographical Science Beijing Normal UniversityBeijing 100875China Academy of Plateau Science and Sustainability People’s Government of Qinghai Province and Beijing Normal UniversityXining 810016China

Landslides cause huge human and economic losses *** landslide precursors is crucial for disaster *** small baseline subset interferometric synthetic-aperture radar(SBAS-InSAR)has been a popular method for detecting landslide ***,non-monotonic displacements in SBAS-InSAR results are pervasive,making it challenging to single out true landslide *** exploiting time series displacements derived by SBAS-InSAR,we proposed a method to identify moving *** method calculates two indices(global/local change index)to rank monotonicity of the time series from the derived *** two thresholds of the proposed indices,more than 96%of background noises in displacement results can be *** also found that landslides on the east and west slopes are easier to detect than other slope aspects for the Sentinel-1 *** repressing background noises,this method can serve as a convenient tool to detect landslide precursors in mountainous areas.

关键词： Monotonously changing displacements Moving landslides SBAS-InSAR Time series of deformation

Improvement of machining accuracy in EDCM by enhanced electrochemical reaming based on a non-metallic backing layer

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Chinese Journal of Aeronautics 2021年第12期34卷 251-264页

作者： Chen WANG Yan ZHANG Lei JI wentao yang Jingjing WANG School of Mechanical and Power Engineering Nanjing Tech UniversityNanjing 211800China

Electrochemical Discharge Machining(ECDM)is potentially applicable for the fabrication of film-cooling ***,It is extremely difficult for the holes to achieve higher precision and machining quality owing to the working liquid diminish in the lateral machining *** this study,a non-metallic backing layer was proposed to overcome the diminish of working liquid,and the electrochemical reaming,as a post-processing method for ECDM,was used to further improve the machining accuracy and quality of the ***,the three-dimensional morphology of the melted pit of a paraffin backing layer was scanned to obtain the geometric ***,simulation analysis and experimental verification of auxiliary flushing by using the non-metallic backing layer were *** machining performance of the holes machined with electrochemical reaming based on non-metallic backing layer was confirmed by the observations of the surface topography of the hole wall and orifice,measurement of the orifice precision,and analysis of the element composition on the surface of the orifice ***,an optimum combination of machining parameters for electrochemical reaming is obtained through a process parameter optimization experiment.

关键词： Backing layer ECDM Electrochemical reaming Non-metallic

A novel method for discovering spatio-temporal clusters of different sizes, shapes, and densities in the presence of noise

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International Journal of Digital Earth 2014年第2期7卷 138-157页

作者： Qiliang Liu Min Deng Jiantao Bi wentao yang Department of Surveying and Geo-informatics Central South UniversityChangshaChina Department of Land Surveying and Geo-Informatics Hong Kong Polytechnic UniversityHong Kong Center for Earth Observation and Digital Earth Chinese Academy of SciencesBeijingChina

The discovery of spatio-temporal clusters in complex spatio-temporal data-sets has been a challenging issue in the domain of spatio-temporal data mining and knowledge *** this paper,a novel spatio-temporal clustering method based on spatio-temporal shared nearest neighbors(STSNN)is proposed to detect spatio-temporal clusters of different sizes,shapes,and densities in spatiotemporal databases with a large amount of *** concepts of windowed distance and shared nearest neighbor are utilized to define a novel spatiotemporal density for a spatio-temporal entity with definite mathematical ***,the density-based clustering strategy is employed to uncover spatio-temporal *** spatio-temporal clustering algorithm developed in this paper is easily implemented and less sensitive to density variation among spatio-temporal *** are undertaken on several simulated datasets to demonstrate the effectiveness and advantage of the STSNN ***,the real-world applications on two seismic databases show that the STSNN algorithm has the ability to uncover foreshocks and aftershocks effectively.

关键词： spatio-temporal clustering shared nearest neighbor windowed distance spatio-temporal density foreshocks and aftershocks data mining Digital Earth geo-spatial science geospatial data integration

Buckling of a ferromagnetic thin plate in a transverse static magnetic field

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Chinese Science Bulletin 1998年第19期43卷 1666-1670页

作者： wentao yang Hao Pan Dali Zheng Qigong Cai Cent Iron & Steel Res Inst Beijing 100081 Peoples R China

An energy theory is proposed on the buckling of a ferromagnetic thin plate in a transverse static magnetic field. The analytic solution of critical field for plates is obtained by using variational method. It is shown that the critical magnetic field is not only influenced by the ratio of the thickness to the length, but also by the width, total length and the magnetic susceptibility of the specimen. Theoretical calculations agree with experiments reasonably.

关键词： static magnetic field ferromagnetic thin plate buckling energy theory.

Fabrication of Fe nanocomplex pillared few-layered Ti_(3)C_(2)T_(x)MXene with enhanced rate performance for lithium-ion batteries

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Nano Research 2021年第4期14卷 1218-1227页

作者： Pengfei Huang Shunlong Zhang Hangjun Ying wentao yang Jianli Wang Rongnan Guo Weiqiang Han School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China

Pillaring technologies have been considered as an effective way to improve lithium storage performance of Ti_(3)C_(2)T_(x)***,the pillared hybrids suffer from sluggish Li^(+)diffusion kinetics and electronic transportation due to the compact multi-layered MXene structure,thus exhibiting inferior rate ***,the few-layered Ti_(3)O_(2)MXene(f-Ti_(3)C_(2)MXene)which is free from restacking can be prepared quickly based on the NH4^(+)ions ***,Fe nanocomplex pillared few-layered Ti_(3)C_(2)T_(x)(FPTC)heterostructures are fabricated via the intercalation of Fe ions into the interlayer of f-Ti_(3)C_(2)*** f-Ti_(3)C_(2)MXene which is immune to restacking can provide a highly conductive substrate for the rapid transport of Li+ions and electrons and possess adequate electrolyte accessible ***,f-Ti_(3)C_(2)MXene can efficiently relieve the aggregation,prevent the pulverization and buffer the large volume change of Fe nanocomplex during lithiation/delithiation process,leading to enhanced charge transfer kinetics and excellent structural stability of FPTC ***,the FPTC hybrids exhibit a high capacity of 535 mAh·g^(-1)after 150 cycles at 0.5 A·g^(-1)and an enhanced rate performance with 310 mAh·g^(-1)after 850 cycles at 5 A·g^(-1).This strategy is facile,universal and can be extended tofabricate various few-layered MXene-derived hybrids with superior rate capability.

关键词： Feions intercalation few-layered MXene pillared MXene lithium-ion batteries

A robust and efficient algorithm for Chinese historical document analysis and recognition

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National Science Review 2023年第6期10卷 9-12页

作者： Chongyu Liu Cheng Jian Jiarong Huang wentao yang Yongxin Shi Qing Jiang Lianwen Jin School of Electronic and Information Engineering South China University of Technology SCUT-Zhuhai Institute of Modern Industrial Innovation

PROBLEM Historical documents,which contain valuable information on historical knowledge and literary arts,are important mediums for the inheritance of human ***,the preservation of historical documents is considered to be an urgent research *** efficient way is to develop a document digitization system,which requires accurate historical document recognition and *** the rapid development of optical character recognition techniques,historical document understanding has made great progress [1,2] and several benchmarkshave been established [3-5].

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High-temperature dielectric and microwave absorption performances of TiB2/Al2O3 ceramics prepared by spark plasma sintering

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Science China(Technological Sciences) 2021年第6期64卷 1264-1275页

作者： LIU XiongZhang LUO Hui LI YinRui CHEN Fu LIU JieLing yang wentao WANG Xian GONG RongZhou School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China School of Information Science and Engineering Wuhan University of Science and TechnologyWuhan 430081China

TiB_(2)/Al2O3 ceramics reinforced with Mg O are prepared by spark plasma sintering(SPS).The dielectric and microwave(MW)absorption properties are *** results indicate that both the commercial TiB_(2)(C-TiB_(2))content and preparing temperature play important roles in the dielectric ***,TiB_(2)/Al2O3 composite shows the best MW absorption property when the C-TiB_(2)content and preparing temperature are 9 wt%and 1400°*** further improve the MW absorption properties,the composite containing 9 wt%synthesized TiB_(2)(S-TiB_(2))has been sintered at 1400°*** high-temperature complex permittivity is greater than that of TiB_(2)/Al2O3 composite with 9 wt%C-TiB_(2)sintered at 1400°C and is directly proportional to the ***,TiB_(2)/Al2O3 composite with 9 wt%S-TiB_(2)possesses a better MW absorption at 25–500°C,its effective absorption bandwidth(RL<-5 dB)can reach 4.2 GHz at 25–500°*** the minimum reflection loss(RLmin)value reaches-43.41 dB at the temperature of 800°C with a thickness of 1.45 mm for TiB_(2)/Al2O3 composite with 9 wt%C-TiB_(2).Consequently,the satisfying absorbing layer(d<1.75 mm),flexural strength,heat stability and considerable high-temperature MW absorption ability grant TiB_(2)/Al2O3 ceramics practical applications as high-temperature microwave absorption materials(MAMs).

关键词： titanium boride aluminium oxide heat stability electric conductivity high-temperature microwave absorption properties

Landslide Research from the Perspectives of Qinling Mountains in China:A Critical Review

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Journal of Earth Science 2024年第5期35卷 1546-1567页

作者： Liye Feng Wenwen Qi Chong Xu wentao yang Zhiqiang yang Zikang Xiao Zhaoning Chen Tao Li Xiaoyi Shao Huiran Gao Zhiwen Xue National Institute of Natural Hazards Ministry of Emergency Management of ChinaBeijing 100085China School of Soil and Water Conservation Beijing Forestry UniversityBeijing 100083China Key Laboratory of Compound and Chained Natural Hazards Dynamics Ministry of Emergency Management of ChinaBeijing100085China School of Emergency Management Science and Engineering University of Chinese Academy of SciencesBeijing 100049China

Landslides pose a frequent geological threat,endangering both productivity and the wellbeing of human life and *** recent years,landslides have received widespread attention in various *** article presents a comprehensive review of landslide research in the Qinling Mountains,*** first part introduces landslide investigation and inventory,which include manual visual interpretation and automatic landslide *** second part discusses the types,characteristics,and temporal-spatial distribution of landslides in the Qinling *** the third part,the mechanisms and stability analysis of landslides are explored,along with a discussion of the applicability of various simulation *** fourth part focuses on significant studies related to landslide evaluation,including susceptibility,hazard,and risk *** fifth part addresses landslide monitoring and early warning ***,an assessment is made of the current issues and research status concerning landslide studies in the Qinling Mountains,followed by a discussion on future research directions.

关键词： Qinling Mountains landslide review engineering geology