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Qualitative Analyses of Correlations between Strong Ground Motions of the Three Large Earthquakes and Landslide Distributions

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Journal of Earth Science 2023年第2期34卷 369-380页

作者： Yuzhu bai Chong Xu Institute of Geology China Earthquake AdministrationBeijing 100029China National Institute of Natural Hazards Ministry of Emergency Management of ChinaBeijing 100085China Key Laboratory of Compound and Chained Natural Hazards Dynamics Ministry of Emergency Management of ChinaBeijing 100085China

In this work,the correlations between spatial distributions of landslide point density(LPD)and strong ground motions of the three strong earthquakes are qualitatively investigated.Meanwhile the qualitative relationship between the distribution of LPD and the fault rupture process is also characterized.Three strong events are the Lushan,Wenchuan,and Jiuzhaigou earthquakes.In order to reconstruct the near filed strong ground motions and the fault processes of these earthquakes,the broadband ground simulation method of University of California Santa Barbara(UCSB)and the simplified crustal layer structures are applied.To show the rationality of the UCSB method,the fault slip distributions of the three earthquakes reconstructed by the kinematic rupture generator model in the UCSB method are compared with those by inversed.Furthermore,the validation of the UCSB method for the three earthquakes is also carried according to the validation exercise of the Southern California Earthquake Center(SCEC)Broadband Platform(BBP).Lastly,the fields of peak ground acceleration(PGA)and peak ground velocity(PGV)in three mutually perpendicular directions of the three earthquakes are achieved.Generally,the landslide distribution length of large LPD values along the fault strike is less than the fault strike length.Therefore,the slip modes of earthquake faults affect the distributions of landslides.For the strike slip earthquakes,the distributions of large LPD values relate well to PGA and PGV components of the parallel and normal to the fault strike.For the reverse slip earthquakes,distributions of LPD relate to ground motion components in all directions.Moreover,distributions of landslides in near fields of earthquakes are significantly affected by the focus parameters and fault scales.

关键词： Lushan earthquake Wenchuan earthquake Jiuzhaigou earthquake landslide ground motions engineering geology

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Gaussian mixture model based adaptive control for uncertain nonlinear systems with complex state constraints

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Chinese Journal of Aeronautics 2022年第5期35卷 361-373页

作者： Yuzhu bai Rong CHEN Yong ZHAO Yi WANG College of Aerospace and Engineering National University of Defense TechnologyChangsha 410073China Nanjing Research Institute of Electronics Technology Nanjing 210000China

This paper addresses an uncertain nonlinear control system problem with complex state constraints and mismatched uncertainties.A novel Gaussian Mixture Model(GMM)based adaptive PID-Nonsingular Terminal Sliding Mode Control(NTSMC)(GMM-adaptive-PID-NTSMC)method is proposed.It is achieved by combining a GMM based adaptive potential function with a novel switching surface of PID-NTSMC.Next,the stability of the closed-loop system is proved.The main contribution of this paper is that the GMM method is applied to obtain the analytic description of the complex bounded state constraints,ensuring that the states'constraints are not violated with GMM-based adaptive potential function.The developed potential function can consider the influence of uncertainties.More importantly,the GMM-adaptive-PID-NTSMC can be generalized to control a more representative class of uncertain nonlinear systems with constrained states and mismatched uncertainties.In addition,the proposed controller enhances the robustness,and requires less control cost and reduces the steady state error with respect to the Artificial Potential Function based Nonsingular Terminal Sliding Mode Control(APF-NTSMC),GMM-NTSMC and GMM-adaptive-NTSMC.At last,numerical simulation is performed to validate the superior performance of the proposed controller.

关键词： Gaussian mixture model Nonlinear systems State constrained Terminal sliding mode control Uncertain

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Extrusion deformation process of ground surface during the Lushan earthquake in China

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Geodesy and Geodynamics 2017年第2期8卷 84-89页

作者： Yuzhu bai Key Laboratory of Active Tectonics and Volcano Institute of GeologyChina Earthquake Administration

Based on finite element method, the extrusion deformation process of ground surface during the Lushan earthquake （April 20, 2013） is investigated in this work. In order to construct the finite element model of Lushan earthquake structure, the geophysical layer model of Lushan area, the frictional characteristic of slip-weaken along the fault surface, and the Coulomb failure criterion are considered. Through the computation and the comparison with achievement on the Lushan focal dynamics, our researches indicate that：（1） The most extrusion deformation of ground surface occurred in the initial phase of earthquake procession, i.e., between the fourth and sixth seconds after the earthquake occurred. （2） Between the first and sixth seconds after the earthquake, the extrusion deformation concentrates on the surface projection of earthquake fault. （3） Between the first and third seconds after the earthquake, the extrusion deformation of ground surface is very tiny. Meanwhile, the extrusion deformation reaches maximum at the sixth second after earthquake. （4） After 6 s of Lushan earthquake, the extrusion deformation spread out of earthquake structure projection. （5） During the earthquake, the maximum of extrusion deformation on ground surface is larger than the final deformation of the post-earthquake, in other words, the ground extrusion deformation will lastly reach a relatively small value after the Lushan earthquake occurred.

关键词： Lushan earthquake Extrusion deformation Finite element method

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The qualitative analyses of correlations between strong ground motions of the three large earthquakes and landslide distributions

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Journal of Earth Science 2021年

作者： Yuzhu bai Chong Xu Institute of Geology China Earthquake Administration

In this work， the correlations between spatial distributions of landslide point density (LPD) and strong ground motions of the three strong earthquakes are qualitatively investigated. Meanwhile the qualitative relationship between the distribution of LPD and the fault rupture process is also characterized. Three strong events are the Lushan， Wenchuan， and Jiuzhaigou earthquakes. In order to reconstruct the near filed strong ground motions and the fault processes of these earthquakes， the broadband ground simulation method of University of California Santa Barbara (UCSB) and the simplified crustal layer structures are applied. To show the rationality of the UCSB method， the fault slip distributions of the three earthquakes reconstructed by the kinematic rupture generator model in the UCSB method are compared with those by inversed. Furthermore， the validation of the UCSB method for the three earthquakes is also carried according to the validation exercise of the Southern California Earthquake Center (SCEC) Broadband Platform (BBP). Lastly， the fields of peak ground acceleration (PGA) and peak ground velocity (PGV) in three mutually perpendicular directions of the three earthquakes are achieved. Generally， the landslide distribution length of large LPD values along the fault strike is less than the fault strike length. Therefore， the slip modes of earthquake faults affect the distributions of landslides. For the strike slip earthquakes， the distributions of large LPD values relate well to PGA and PGV components of the parallel and normal to the fault strike. For the reverse slip earthquakes， distributions of LPD relate to ground motion components in all directions. Moreover， distributions of landslides in near fields of earthquakes are significantly affected by the focus parameters and fault scales.

关键词： Lushan earthquake Wenchuan earthquake Jiuzhaigou earthquake Landslide Ground motions

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Spacecraft formation reconfiguration with multi-obstacle avoidance under navigation and control uncertainties using adaptive artificial potential function method

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Astrodynamics 2020年第1期4卷 41-56页

作者： Yi Wang Xiaoqian Chen Dechao Ran Yong Zhao Yang Chen Yuzhu bai College of Aerospace Science and Engineering National University of Defense TechnologyChangsha410073China National Innovation Institute of Defense Technology Chinese Academy of Military SciencesBeijing10071China

In this paper,an adaptive artificial potential function(AAPF)method is developed for spacecraft formation reconfiguration with multi-obstacle avoidance under navigation and control uncertainties.Furthermore,an improved Linear Quadratic Regular(ILQR)is proposed to track the reference trajectory and a Lyapunov-based method is employed to demonstrate the stability of the overall closed-loop system.Compared with the traditional APF method and the equal-collision-probability surface(ECPS)method,the AAPF method not only retains the advantages of APF method and ECPS method,such as low computational complexity,simple analytical control law and easy analytical validation progress,but also proposes a new APF to solve multi-obstacle avoidance problem considering the influence of the uncertainties.Moreover,the ILQR controller obtains high control accuracy to enhance the safe performance of the spacecraft formation reconfiguration.Finally,the effectiveness of the proposed AAPF method and the ILQR controller are verified by numerical simulations.

关键词： spacecraft formation flying spacecraft formation reconfiguration collision avoidance artificial potential function uncertainties

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Ecological selection of bacterial taxa with larger genome sizes in response to polycyclic aromatic hydrocarbons stress

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Journal of Environmental Sciences 2022年第2期34卷 82-93页

作者： yuzhu Dong Shanghua Wu Haonan Fan Xianglong Li Yijing Li Shengjun Xu Zhihui bai Xuliang Zhuang Key Laboratory of Environmental Biotechnology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China College of Resources and Environment University of Chinese Academy of SciencesBeijing 200049China College of Sino-Danish Center University of Chinese Academy of SciencesBeijing 100049China

Polycyclic aromatic hydrocarbons(PAHs)are ubiquitous priority pollutants that cause great damage to the natural environment and health.Average genome size in a community is critical for shedding light on microbiome's functional response to pollution stress within an environment.Here,microcosms under different concentrations were performed to evaluate the selection of PAHs stress on the average genome size in a community.We found the distinct communities of significantly larger genome size with the increase of PAHs concentration gradients in soils,and consistent trends were discovered in soils at different latitudes.The abundance of Proteobacteria and Deinococcus-Thermus with relatively larger genomes increased along with PAHs stress and well adapted to polluted environments.In contrast,the abundance of Patescibacteria with a highly streamlined and smaller genome decreased,implying complex interactions between environmental selection and functional fitness resulted in bacteria with larger genomes becoming more abundant.Moreover,we confirmed the increased capacity for horizontal transfer of degrading genes between communities by showing an increased connection number per node positively related to the nid A gene along the concentration gradients in the co-occurrence network.Our findings suggest PAHs tend to select bacterial taxa with larger genome sizes,with significant consequences for community stability and potential biodegradation strategies.

关键词： Pollution stress Polycyclic aromatic hydrocarbons(PAHs) Genome size Horizontal gene transfer Soil microbial community

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Reduced-Order Fixed-Time Control for Under-actuated Spacecraft Hovering

Reduced-Order Fixed-Time Control for Under-actuated Spacecra...

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第40届中国控制会议

作者： Yi Cao Zhijun Chen Yuzhu bai Yong Zhao College of Aerospace Science and Engineering National University of Defense Technology

This paper proposes a Reduced-Order Fixed-Time Control（ROFTC） method for the hovering problem of the under-actuated spacecraft. Firstly, the dynamic equation of the under-actuated relative motion is established for the hovering mission of the under-actuated spacecraft, and the controllability of the system and the feasible set of hovering are analyzed. Then,under-actuated relative motion model is deduced by dimensionality reduction. Based on the reduced-order dynamics model, a fixed-time controller is proposed. The simulation results show that the under-actuated spacecraft can achieve hovering motion to the given position under the reduced-order fixed-time controller, and the system state can converge in a fixed time with high accuracy.

关键词： Under-actuated Spacecraft Hovering Fixed-Time Control Reduced-Order Control

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Deep learning-enabled virtual histological staining of biological samples

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Light(Science & Applications) 2023年第3期12卷 335-354页

作者： Bijie bai Xilin Yang yuzhu Li Yijie Zhang Nir Pillar Aydogan Ozcan Electrical and Computer Engineering Department University of CaliforniaLos AngelesCA 90095USA Bioengineering Department University of CaliforniaLos Angeles 90095USA California NanoSystems Institute(CNSi) University of CaliforniaLos AngelesCAUSA

Histological staining is the gold standard for tissue examination in clinical pathology and life-science research,which visualizes the tissue and cellular structures using chromatic dyes or fluorescence labels to aid the microscopic assessment of tissue.However,the current histological staining workflow requires tedious sample preparation steps,specialized laboratory infrastructure,and trained histotechnologists,making it expensive,time-consuming,and not accessible in resource-limited settings.Deep learning techniques created new opportunities to revolutionize staining methods by digitally generating histological stains using trained neural networks,providing rapid,cost-effective,and accurate alternatives to standard chemical staining methods.These techniques,broadly referred to as virtual staining,were extensively explored by multiple research groups and demonstrated to be successful in generating various types of histological stains from label-free microscopic images of unstained samples;similar approaches were also used for transforming images of an already stained tissue sample into another type of stain,performing virtual stain-to-stain transformations.In this Review,we provide a comprehensive overview of the recent research advances in deep learning-enabled virtual histological staining techniques.The basic concepts and the typical workflow of virtual staining are introduced,followed by a discussion of representative works and their technical innovations.We also share our perspectives on the future of this emerging field,aiming to inspire readers from diverse scientifc fields to further expand the scope of deep learning-enabled virtual histological staining techniques and their applications.

关键词： Deep generating consuming

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Apply of Explicit Finite Element in Seismic Ground Motion Computation

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Journal of Applied Mathematics and Physics 2013年第6期1卷 11-14页

作者： Yuzhu bai Xiwei Xu Active Tectonics and Volcano Lab Key Lab of China Earthquake Administration Beijing China

In this paper, we will use the explicit finite element to compute ground motion due to Tangshan earthquake. The explicit finite-element method uses one integration point and an hourglass control scheme. We implement the coarse-grain method in a structured finite-element mesh straightforwardly. At the same time, we also apply the coarse-grain method to a widely used, slightly unstructured finite-element mesh, where unstructured finite elements are only used in the vertical velocity transition zones. By the finite-element methods, we can compute the ground velocity with some distance to the seismogenic fault in Tangshan earthquake. Through the computation, we can find the main character of ground motion for the strike slip earthquake events and the high frequency vibration motion of ground motion.

关键词： Finite-Element Method Fault Ground Motion Tangshan Earthquake

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Adaptive Non-singular Terminal Fault-tolerant Control for Rigid Spacecraft Attitude Maneuver

Adaptive Non-singular Terminal Fault-tolerant Control for Ri...

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第36届中国控制会议

作者： Dechao Ran Tao Sheng Yi Wang Xiaoqian Chen Ziyan Pang Yuzhu bai College of Aerospace Science and Engineering National University of Defense Technology College of Basic Education for Commanding Officers National University of Defense Technology

ISBN: (纸本)9781538629185

In this paper,an adaptive non-singular terminal fault-tolerant controller has been designed for rigid spacecraft attitude maneuver.The proposed controller is based on the sliding mode scheme.An adaptive learning algorithm is applied for the estimation of the uncertainties.The non-singular terminal sliding surface is introduced to guarantee the system states converge to the desired states in finite time.Numerical simulation results state that the proposed fault tolerant controller is successful in achieving high control precision with finite time convergence.

关键词： attitude maneuver non-singular terminal sliding fault tolerant adaptive control actuator failure

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