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Slip rate and interseismic coupling along the Moxi-Shimian segment of the Xianshuihe fault, Eastern Qinghai-Xizang Plateau

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Geodesy and Geodynamics 2024年第4期15卷 338-351页

作者： Xinyu Zhao Gang Liu Zhaosheng Nie Wei Xiong Wei Chen Mu Lin Dijin wang Qi Li Jiansheng Yu dongzhen wang Pengfei Yu Institute of Seismology China Earthquake AdministrationWuhan 430071China Key Laboratory of Earthquake Geodesy.China Earthquake Administration Wuhan 430071China State Key Laboratory of Geodesy and Earth's Dynamics Innovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan 430077China

On September 5,2022,the Luding M6.8 earthquake occurred in the Moxi-Shimian segment of the Xianshuihe fault,coinciding with the historical ruptured zone of the 1786 Moxi *** seis-mogenic environment provides a foundation for comprehending the mechanism of the earthquake and its future *** the Moxi-Shimian segment,we establish a series of near-field Global Navigation Satellite Systems(GNsS)stations to enhance the spatial resolution of observational data for the inversion of the interseismic kinematic *** this study,with an elastic screw dislocation model con-strained by GNsS observations,the slip rate of the Moxi-Shimian segment is estimated to be 10.9±1.0 mm/yr,while the locking depth is 15.7±6.2 ***,we utilize a block-dislocation model to invert the interseismic fault coupling along the Kangding-Moxi-Shimian *** result indicates a gradual deepening of the locking depth along the section from Kangding to *** coseismic rupture of the 2022 event occurred within the high coupling regions in the Kangding-Moxi-Shimian segment,which indicates that the rupture kinematics in this event might be controlled by the interseismic *** seismic moment accumulated within the ruptured zone of the Luding earthquake since 1786 ranges in[1.42-3.40]×10^(19) N-m,which is significantly greater than the seismic moment released during the 2022 *** a result,we infer that the Luding earthquake released only a portion of the accumulated energy within the original rupture zone since 1786,indicating that the 2022 event has not caused a complete rupture in the Moxi-Shimian ***,there remains a substantial seismic hazard in this area.

关键词： Moxi-Shimian segment of Xianshuihe fault Luding earthquake Global positioning system Interseismic kinematic parameters

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基于RRT-Dubins的无人机航迹优化方法

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兵工学报 2024年第8期45卷 2761-2773页

作者：王东振张岳赵宇黄大庆扬州大学信息工程学院江苏扬州225000 南京航空航天大学无人机研究院江苏南京210016

针对多障碍物环境下考虑无人机(Unmanned Aerial Vehicle,UAV)始末位姿、转弯半径和航迹长度的1阶光滑约束的UAV航迹规划问题,提出一种基于快速搜索随机树(Rapidly-exploring Random Trees,RRT)算法和Dubins曲线以局部最优逼近全局最优... 详细信息

针对多障碍物环境下考虑无人机(Unmanned Aerial Vehicle,UAV)始末位姿、转弯半径和航迹长度的1阶光滑约束的UAV航迹规划问题,提出一种基于快速搜索随机树(Rapidly-exploring Random Trees,RRT)算法和Dubins曲线以局部最优逼近全局最优的UAV航迹优化方法。利用RRT算法和基于贪心算法的剪枝优化方法,在二维任务空间中规划出满足避障要求的可行离散航路点。采用多条Dubins曲线平滑连接航路点,根据UAV始末位姿确定首尾曲线端点,基于UAV性能、障碍物和飞行参数的约束关系,建立多约束的航迹优化数学模型。通过粒子群优化算法确定曲线类型,同时优化曲线连接处位姿和曲线半径,获得最短航迹。仿真结果表明:所提方法得到的航迹与其他方法相比,在不同障碍物数量和始末位姿的多种场景中,平均长度缩短了11.48%,在避开障碍物的同时,满足UAV动力学约束。

关键词：无人机航迹规划快速搜索随机树算法 Dubins曲线粒子群优化算法航迹优化

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Vibration and acoustic radiation of bogie area under random excitation in high-speed trains

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Journal of Modern Transportation 2019年第2期27卷 120-128页

作者： dongzhen wang Jianmin Ge School of Physical Sciences and Engineering Tongji University Shanghai 200092 China CRRC Qingdao Sifang Co. Ltd Qingdao 266111 China

Based on the experiments on a platform with real vehicle structure and finite element simulation, the vibration and interior acoustic radiation under random excitations of high-speed trains’ bogie area were studied. Firstly, combined with line tests, a vehicle body with a length of 7 m was used as the research object. By comparing the results of experiment and simulation, the accuracy of the finite element model was verified. Secondly, the power spectral density curves at typical measuring points in bogie area were obtained by processing and calculating the line test data, which was measured when the vehicle ran at high speeds, and the standard vibration spectrum of the bogie area was obtained by the extreme envelope method. Furthermore, the random vibration test and simulation prediction analysis of the real vehicle structure were carried out to further verify the accuracy of the noise and vibration prediction model. Finally, according to the vibration and acoustic radiation theory, the indirect boundary element method was adopted to predict the acoustic response of the real vehicle. The analysis shows that the simulated power spectral density curves of acceleration and sound pressure level are highly consistent with the experimental ones, and the error between the simulated prediction and the experimental result is within the allowable range of 3 dB.

关键词： High-speed trains Standard vibration spectrum Indirect boundary element method Random excitation Acoustic radiation

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超导磁悬浮列车磁液复合减振装置承载特性研究

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低温工程 2024年第1期 58-64页

作者：伊建辉周诗林齐浩然李新康王东镇中车工业研究院(青岛)有限公司青岛266109

为提升超导磁悬浮列车的运行品质,提出了一种超导磁液复合减振装置,研究了超导磁液复合减振装置的结构和工作原理,给出了性能计算方法及流程,分析了不同场作用时的承载特性。研究得出随超导体数量的增加承载力变大,且存在一个最优的超... 详细信息

为提升超导磁悬浮列车的运行品质,提出了一种超导磁液复合减振装置,研究了超导磁液复合减振装置的结构和工作原理,给出了性能计算方法及流程,分析了不同场作用时的承载特性。研究得出随超导体数量的增加承载力变大,且存在一个最优的超导体数量值,为了获得高承载力应该保证永磁盘宽度与超导体直径基本相等,永磁盘厚度增加到一定值后承载力增加幅值变小;液氮润滑膜压力在超导体中心处有最大值,随着转速的增加液氮润滑膜厚度增加、温升提高;磁场和流场共同作用后可以降低液氮润滑膜的压力及温度,随着转速的升高可以大幅提升超导磁液复合减振装置的承载力。

关键词：磁悬浮列车磁液复合减振装置承载特性

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Geodetic monitoring of the Changbaishan volcano activity and its relationship with earthquakes,1999-2017

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Geodesy and Geodynamics 2021年第4期12卷 239-248页

作者： dongzhen wang Bin Zhao Dongyang Liu Jiansheng Yu Feng Guo Institute of Seismology CEAWuhan430071China Key Laboratory of Earthquake Geodesy CEAWuhan 430071China Hubei Earthquake Administration Wuhan430071China China University of Geosciences Beijing 100083China Jilin Earthquake Administration Changchun 130117China

The major earthquakes often trigger unrest of surrounding volcanic magma *** recent years,three major earthquakes occurred around the Changbaishan volcano,but it was unclear whether these earthquakes triggered the unrest of the magma *** on geodetic data,we analyzed the volcanic activity according to the Global Position System(GPS)and leveling sites time-series and reestimated the location and volume change of magma chamber from 2002 to ***,we calculated the dilatational strain variations of the deep magma chamber resulting from coseismic deformations caused by the 1999 Mw7.0 and 2002 Mw7.3 wangqing deep earthquakes and the 2011 Mw9.0 Tohoku-oki *** results show:(1)Changbaishan has experienced four stages of unrest since 1999,and the biggest unrest of the shallow magma chamber occurred from 2002 to 2005;(2)the parameters of the shallow magma chamber simulated by the Mogi and Point Compound Dislocation Model(p DCM)show that the magma chamber is located in the northern part of the crater,with a depth of approximately 7 *** volume of the magma chamber increased by 25-28×10^(6) m from 2002 to2005;(3)the strain variation beneath the Changbaishan volcano corresponding to the 1999 wangqing earthquake was *** 2002 wangqing earthquake produced an expansion strain of about 4.4 nanostrain on the magma chamber at a depth of 550 km,and probably promoted the unrest of the Changbaishan *** 2011 Tohoku earthquake induced the expansion of the shallow magma chamber and compression of the deep magma *** this event promoted shallow magma unrest,it inhibited deep magma *** may explain why the Changbaishan did not show obvious unrest after the 2011 Tohoku ***,more attention should be paid to earthquakes that can promote deep magma unrest in the Changbaishan volcano.

关键词： Changbaishan volcano Magma chamber parameters Earthquake Dilatational strain

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Active tectonic deformation around the Tarim Basin inferred from dense GPS measurements

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Geodesy and Geodynamics 2020年第6期11卷 418-425页

作者： dongzhen wang Bin Zhao Jiansheng Yu Kai Tan Key Laboratory of Earthquake Geodesy Institute of SeismologyChina Earthquake AdministrationWuhan430071China

The surrounding area of the Tarim Basin is featured by active tectonic deformation and intense seismic *** study of the crustal deformation characteristics of this area will help revealing the role of the Tarim Basin in the crustal *** order to accurately obtain the deformation characteristics of this area,we firstly obtained the highly detailed and accurate three-dimensional(3D)crustal deformation velocities of the Tarim Basin and its surrounding areas through high-precision processing of existing Global Positioning System(GPS)***,the slip rate and strain rate fields of the main faults in the region were calculated based on the updated velocity *** strain rate of the Altyn Tagh fault is dominated by shear strain and the strike slip rate is 8-10 mm/*** strain rate between the Tien Shan and Tarim Basin is dominated by extrusion strain,and the extrusion rate is 4-6 mm/*** addition to the large shear strain,there is also a certain tensile strain in the Tibetan *** results show that the main driving force for the deformation of the Tien Shan is the northward thrust of the Tarim *** relative movement mode between the Tarim Basin and Tibetan Plateau mainly comprises the strike slip movement along the strike direction of the Altyn Tagh fault,with a small extrusion ***,the Tarim Basin has little influence on the northesouth shortening deformation of the Tibetan Plateau.

关键词： Tarim Basin Velocity field Strain rate Slip rate Crustal deformation

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Odorant-binding protein 19 in Monochamus alternatus involved in the recognition of a volatile strongly emitted from ovipositing host pines

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Insect Science 2024年第1期31卷 134-146页

作者： Ruinan Yang dongzhen Li Shancheng Yi Yi Wei Manqun wang Hubei Insect Resources Utilization and Sustainable Pest Management Key Laboratory College of Plant Science and TechnologyHuazhong Agricultural UniversityWuhanChina Key Laboratory of Forest Protection of National Forestry and Grassland Administration Ecology and Nature Conservation InstituteChinese Academy of ForestryBeijingChina

Monochamus alternatus is the primary carrier of pine wood nematodes,which pose a serious threat to Pinus *** many *** emerging *** adults feed on heathy host pines,while matured adults transfer to stressed host pines for mating and *** odorant-binding proteins(OBPs)of *** have been proved to aid in the complex process of host *** clarify the corresponding relations between OBPs and pine volatiles,more OBPs need to be *** this research,MaltOBP19 showed a specific expression in the antennae and mouthparts of ***,and it was marked in 4 types of antenna sensilla by *** binding assays demonstrated the high binding affinity of MaltOBP19 with camphene and myrcene in *** Y-tube olfactory experiments,*** adults were attracted by camphene and RNAi of OBP19 via microinjection significantly decreased their attraction *** induced phobotaxis,but RNAi had no significant effect on this ***,we found that ingesting dsOBP19 produced by a bacteria-expressed system with a newly constructed vector could lead to the knockdown of *** results suggest that MaltOBP19 may play a role in the process of host conversion via the recognition of camphene,which has been identified to be strongly released in stressed host *** addition,it is proved that knockdown of OBP can be achieved by oral administration of bacteria-expressed double-stranded RNA in *** adults,providing a new perspective in the control of ***.

关键词： bacteria-expressed dsRNA camphene Japanese pine sawyer beetle MaltOBP19 RNAi stressed host pines

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毫米波频段下纳米MOSFET的导纳参数建模及应用

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工程科学与技术 2018年第4期50卷 186-192页

作者：王军王东振西南科技大学信息工程学院四川绵阳621010

为了统一表征毫米波频段下纳米MOSFET从强反型区到弱反型区的偏置依赖性,对高频MOSFET等效电路建模及其参数提取技术进行了研究,给出了一种简单、精确的小信号模型参数获取方法。基于45 nm MOSFET的器件物理结构,通过综合考虑该器件的... 详细信息

为了统一表征毫米波频段下纳米MOSFET从强反型区到弱反型区的偏置依赖性,对高频MOSFET等效电路建模及其参数提取技术进行了研究,给出了一种简单、精确的小信号模型参数获取方法。基于45 nm MOSFET的器件物理结构,通过综合考虑该器件的本征物理特性、管脚电磁特性以及测试焊盘与测试互连线的寄生特性,描述了一种适用于参数提取的MOSFET毫米波等效电路模型。通过对所给出的45 nm MOSFET毫米波小信号等效电路进行双端口网络参数分析,推导了其准静态近似的毫米波等效电路的导纳()参数的一阶简化数学模型。所建参数模型被应用于等效电路的元件值提取,以保证不同偏置条件下参数提取结果的连续性和平滑度。利用栅指数=10、栅宽=2μm、栅长=45 nm的射频多指NMOSFET,实验验证了1~50 GHz频段内所建参数模型在不同偏置点下的模拟精度,并表征了45 nm器件的偏置依赖性。使用ADS2013仿真设计工具的模拟结果与测量数据进行一致性对比,验证了本文所建模型的实用性以及由其派生的参数提取算法的准确性。因此,所建参数模型易于高精度移植到自动化仿真设计工具中。等效电路本征元件参数单调特性的不同表征,对于指导毫米波集成电路从强反型区到弱反型区的优化设计具有重要的意义。

关键词：纳米MOSFET 导纳参数小信号等效电路毫米波

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高速列车不同转向架区噪声特性及主要噪声源分离

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同济大学学报（自然科学版） 2020年第6期48卷 904-912页

作者：王东镇葛剑敏同济大学物理科学与工程学院上海200092 中车青岛四方机车车辆股份有限公司山东青岛266111

以某型高速列车为研究对象,基于线路运行类比测试,对车辆运行时主要噪声源之一的转向架区噪声开展研究。通过对不同转向架区噪声进行类比测试和对比分析,确定了350km·h^-1及以下速度等级中间车拖车转向架区的主要噪声源为轮轨噪声,头... 详细信息

以某型高速列车为研究对象,基于线路运行类比测试,对车辆运行时主要噪声源之一的转向架区噪声开展研究。通过对不同转向架区噪声进行类比测试和对比分析,确定了350km·h^-1及以下速度等级中间车拖车转向架区的主要噪声源为轮轨噪声,头、尾拖车转向架区主要噪声源为气动噪声,中间车动车转向架区主要噪声源为牵引系统噪声。基于以上的分析结论和一定的假设,对车头、车尾和中间动车转向架区主要噪声源进行了分离特性研究,获取了主要噪声源的频谱和贡献特性。研究结果可为高速列车减振降噪设计提供依据和指导。

关键词：高速列车转向架区轮轨噪声气动噪声牵引系统噪声分离特性

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Slip rate and interseismic coupling along the Moxi-Shimian segment of the Xianshuihe fault, Eastern Qinghai-Xizang Plateau

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Geodesy and Geodynamics 2024年第4期 28页

作者： Xinyu Zhao Gang Liu Zhaosheng Nie Wei Xiong Wei Chen Mu Lin Dijin wang Qi Li Jiansheng Yu dongzhen wang Pengfei Yu

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