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Rapid Susceptibility Mapping of Co-seismic Landslides Triggered by the 2013 Lushan Earthquake Using the Regression Model Developed for the 2008 Wenchuan Earthquake

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Journal of Mountain Science 2013年第5期10卷 699-715页

作者： li wei-le HUANG Run-qiu XU Qiang TANG Chuan State key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology

The primary objective of landslide susceptibility mapping is the prediction of potential landslides in landslide-prone areas. The predictive power of a landslide susceptibility mapping model could be tested in an adjacent area of similar geo- environmental conditions to find out the reliability. Both the 2oo8 Wenchuan Earthquake and the 2o13 Lushan Earthquake occurred in the Longmen Mountain seismic zone, with similar topographical and geological conditions. The two earthquakes are both featured by thrust fault and similar seismic mechanism This paper adopted the susceptibility mapping model of co-seismic landslides triggered by Wenchuan earthquake to predict the spatial distribution of landslides induced by Lushan earthquake. Six influencing parameters were taken into consideration： distance from the seismic fault, slope gradient, lithology, distance from drainage, elevation and Peak Ground Acceleration （PGA）. The preliminary results suggested that the zones with high susceptibility of co- seismic landslides were mainly distributed in the mountainous areas of Lushan, Baoxing and Tianquan counties. The co-seismic landslide susceptibility map was completed in two days after the quake and sent to the field investigators to provide guidance for rescue and relief work. The predictive power of the susceptibility map was validated by ROC curve analysis method using 2o37 co-seismic landslides in the epicenter area. The AUC value of o.71o indicated that the susceptibility model derived from Wenchuan Earthquake landslides showed good accuracy inpredicting the landslides triggered by Lushan earthquake.

关键词： Lushan earthquake Landslide Susceptibility mapping Logistical regression

Co-seismic Landslide Inventory and Susceptibility Mapping in the 2008 Wenchuan Earthquake Disaster Area,China

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Journal of Mountain Science 2013年第3期10卷 339-354页

作者： li wei-le HUANG Run-qiu TANG Chuan XU Qiang Cees van WESTEN State key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology Faculty of Geoinformation Science and Earth Observation (ITC) University of Twente

The Ms 8.0 May 12,2008 Wenchuan earthquake triggered tens of thousands of *** widespread landslides have caused serious casualties and property losses,and posed a great threat to post-earthquake reconstruction.A spatial database,inventoried 43,842 landslides with a total area of 632 km 2,was developed by interpretation of multi-resolution remote sensing *** landslides can be classified into three categories:swallow,disrupted slides and falls;deep-seated slides and falls,and rock *** correlation between landslides distribution and the influencing parameters including distance from co-seismic fault,lithology,slope gradient,elevation,peak ground acceleration(PGA) and distance from drainage were *** distance from co-seismic fault was the most significant parameter followed by slope gradient and PGA was the least significant one.A logistic regression model combined with bivariate statistical analysis(BSA) was adopted for landslide susceptibility *** study area was classified into five categories of landslide susceptibility:very low,low,medium,high and very high.92.0% of the study area belongs to low and very low categories with corresponding 9.0% of the total inventoried *** susceptible zones make up 4.2% of the area with 17.7% of the total *** rest of the area was classified into high and very high categories,which makes up 3.9% of the area with corresponding 73.3% of the total *** the susceptibility map can reveal the likelihood of future landslides and debris flows,and it is helpful for the rebuilding process and future zoning issues.

关键词： Wenchuan Earthquake Landslide Inventory Susceptibility mapping Logistic regression

Multitemporal UAV-based photogrammetry for landslide detection and monitoring in a large area:a case study in the Heifangtai terrace in the Loess Plateau of China

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Journal of Mountain Science 2020年第8期17卷 1826-1839页

作者： XU Qiang li wei-le JU Yuan-zhen DONG Xiu-jun PENG Da-lei State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China

With high spatial resolution,on-demand-flying ability,and the capacity for obtaining threedimensional measurements,unmanned aerial vehicle(UAV)photogrammetry is widely used for detailed investigations of single landslides,but its effectiveness for landslide detection and monitoring in a large area needs to be *** Heifangtai terrace in the Loess Plateau of China is a loess terrace that is extremely susceptible to irrigation-induced loess *** paper used UAV-based photogrammetry for a series of highresolution images spanning over 30 months for landslide detection and monitoring of the terrace with an area of 32 km^*** and evenly distributed ground control points were established and measured to ensure the high accuracy of the photogrammetry *** structure-from-motion(Sf M)technique was used to convert overlapping images into orthographic images,3D point clouds,digital surface models(DSMs)and mesh *** multitemporal differential mesh models,landslide vertical movements and potential landslides were detected and *** results indicate that a combination of UAV-based orthophotos and differential mesh models can be used for flexible and accurate detection and monitoring of potential loess landslides in a large area.

关键词： Unmanned Aerial Vehicle Loess Plateau Landslide detection Landslide monitoring Differential mesh model Vertical movement

Electromagnetic scattering of the carbon nanotubes excited by an electric line source

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Chinese Physics B 2012年第1期21卷 268-272页

作者： Wang Yue Wu Qun Wu Yu-Ming He Xun-Jun li le-wei Department of Electrical Science and Technology Harbin University of Science and TechnologyHarbin 150080China School of Electronics and Information Technology Harbin Institute of TechnologyHarbin 150001China State Key Laboratory of Millimeter Wave Southeast UniversityNanjing 210096China School of Electrical&Electronic Engineering Nanyang Technological University639798Singapore Department of Electrical and Computer Engineering National University of Singapore10 Kent Ridge Crescent 119260Singapore

An analytical solution is presented for the electromagnetic scattering from an infinite-length metallic carbon nanotube and a carbon nanotube bundle. The scattering field and scattering cross section are predicted using a modal technique based on a Bessel and Hankel function for the electric line source and a quantum conductance function for the carbon nanotube. For the particular case of an isolated armchair （10, 10） carbon nanotube, the scattered field predicted from this technique is in excellent agreement with the measured result. Furthermore, the analysis indicates that the scattering pattern of an isolated carbon nanotube differs from that of the carbon nanotube bundle of identical index （m, n） metallic carbon nanotubes.

关键词： scattering carbon nanotubes terahertz

A Q-band CMOS LNA exploiting transformer feedback and noise-cancelling

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Science China(Information Sciences) 2015年第4期58卷 148-157页

作者： WU Jing JIANG ZhengDong YI Kai KANG Kai YU YiMing CHEN JiXin ZHANG lei liU Jun li le-wei Joshua School of Economic Information Engineering Southwestern University of Finance and Economics School of Electronic Engineering University of Electronic Science and Technology of China State Key Laboratory of Millimeter Waves Southeast University Institute of Microelectronics Tsinghua University Key Laboratory of RF Circuits and Systems Hangzhou Dianzi University School of Engineering Monash University

In this paper, a Q-band CMOS low noise amplifier(LNA) exploiting transformer positive-negative feedback and noise cancelling is presented. The proposed low noise amplifier consists of a positive transformer feedback to achieve noise-reduction and a negative transformer feedback to obtain high reverse isolation and stability. The noise cancellation technique is applied in this LNA to achieve a low noise figure. This LNA has been fabricated by standard commercial 90 nm CMOS. According to measurements, this proposed LNA achieves a peak gain of 11.5 d B, a noise figure of 6.5 d B and an input P1 d B of-12 d Bm. It consumes 11.5 m A from a1.2 V supply occupying the area of 0.6×0.7 mm2.

关键词： CMOS low noise amplifier Q-band transformer feedback noise cancelling millimeter wave

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汶川地震诱发滑坡方向效应研究

四川大学学报（工程科学版） 2010年第S1期42卷 7-14页

作者：许强李为乐地质灾害防治与地质环境保护国家重点实验室成都理工大学四川成都610059

针对在野外调查过程中发现汶川地震灾区的一些特殊区域,滑坡的滑动方向呈现出一些与地震动力直接相关的异常现象,作者对典型研究区进行了详细的遥感解译,统计了不同坡向上滑坡灾害的发育密度和大型滑坡滑向与发震断层的关系,得出汶川地... 详细信息

针对在野外调查过程中发现汶川地震灾区的一些特殊区域,滑坡的滑动方向呈现出一些与地震动力直接相关的异常现象,作者对典型研究区进行了详细的遥感解译,统计了不同坡向上滑坡灾害的发育密度和大型滑坡滑向与发震断层的关系,得出汶川地震诱发滑坡具有"背坡面效应"和"断层错动方向效应"。"背坡面效应"是指在与发震断裂带近于垂直的沟谷斜坡中,在地震波传播的背坡面一侧的滑坡发育密度明显大于迎坡面一侧。"断层错动方向效应"是指滑坡的滑动方向与发震断裂的活动方式和错动方向密切相关。在分析强震诱发滑坡成因机理时,应加强对2种因素和效应的研究:1)地震时断裂的突然错动所产生的直接动力对斜坡失稳的初始驱动作用;2)地震过程中地震波在斜坡山体内传播的折射、反射以及由此引起的坡体内应力的变化。

关键词：汶川地震滑坡方向效应背坡面效应断层错动方向效应

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阻抗球涂覆均匀等离子体电磁散射的解析解

电波科学学报 2007年第6期22卷 913-917,936页

作者：耿友林吴健李乐伟杭州电子科技大学电磁环境和模化技术国防重点实验室北京102206 新加坡国立大学

均匀无源各向异性等离子体介质中的电磁场是第一、第二类各向异性等离子体球矢量波函数的线性叠加,在阻抗球表面满足阻抗边界条件、等离子体与自由空间表面满足电磁场切向连续的边界条件,可得出各向异性等离子体涂覆阻抗球在平面波入射... 详细信息

均匀无源各向异性等离子体介质中的电磁场是第一、第二类各向异性等离子体球矢量波函数的线性叠加,在阻抗球表面满足阻抗边界条件、等离子体与自由空间表面满足电磁场切向连续的边界条件,可得出各向异性等离子体涂覆阻抗球在平面波入射情况下,均匀等离子体介质中电磁场用各向异性等离子体球矢量波函数表示的系数满足的矩阵方程,进而得出散射场由球矢量波函数展开的展开系数和雷达散射截面。数值计算的结果表明:当阻抗球的半径趋于0时,其结果和均匀各向异性等离子体球对平面波的电磁散射结果相同。最后还给出了一些数值计算的结果。

关键词：球矢量波函数阻抗球解析解

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论少数民族政治发展的意义、难题及路径选择

湖南师范大学社会科学学报 2009年第3期38卷 53-56页

作者：李乐为吉首大学政治与公共管理学院湖南吉首416000 湖南师范大学公共管理学院湖南长沙410081

少数民族政治发展既是少数民族全面发展的重要内容,又是少数民族社会和谐、协调发展的必然要求,并为民族地区可持续发展奠定了坚实的政治基础。少数民族政治发展在展开的过程中,会遇到政治发展与少数民族政治体系中现有体制的摩擦和冲... 详细信息

少数民族政治发展既是少数民族全面发展的重要内容,又是少数民族社会和谐、协调发展的必然要求,并为民族地区可持续发展奠定了坚实的政治基础。少数民族政治发展在展开的过程中,会遇到政治发展与少数民族政治体系中现有体制的摩擦和冲突、既得利益者的抵制、农村基层政权削弱和权力腐败的消极影响、政治不稳定等方面的难题。当前,应该通过发展少数民族经济、建构新的政治机制和政治关系模式、提升少数民族地区政府的能力、完善民族区域自治制度,继续推进少数民族政治的发展。

关键词：少数民族政治发展障碍意义路径

论少数民族地区政治发展与稳定的基本指标体系构建

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湖南师范大学社会科学学报 2011年第4期40卷 65-69页

作者：李乐为吉首大学政治与公共管理学院湖南吉首416000

我国目前缺乏衡量少数民族地区政治发展与稳定的基本指标体系,构建这样的指标体系有助于全面把握和预测少数民族地区社会政治稳定发展过程,促进少数民族地区的政治建设和经济繁荣,完善民族区域自治制度;衡量少数民族地区社会政治发展与... 详细信息

我国目前缺乏衡量少数民族地区政治发展与稳定的基本指标体系,构建这样的指标体系有助于全面把握和预测少数民族地区社会政治稳定发展过程,促进少数民族地区的政治建设和经济繁荣,完善民族区域自治制度;衡量少数民族地区社会政治发展与稳定的指标体系包括政治秩序、政治制度、政治取向和政治参与四个基本指标,它们之间具有较强的相关性,能够综合测定少数民族地区政治发展与稳定的基本状况。

关键词：少数民族政治发展政治稳定指标体系

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