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Molecule‑Level Multiscale Design of Nonflammable Gel Polymer Electrolyte to Build Stable SEI/CEI for Lithium Metal Battery

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Nano-Micro Letters 2025年第1期17卷 404-423页

作者： Qiqi Sun Zelong Gong tao zhang Jiafeng Li Xianli Zhu Ruixiao Zhu Lingxu Wang Leyuan Ma Xuehui Li Miaofa Yuan Zhiwei zhang Luyuan zhang Zhao Qian Longwei Yin Rajeev Ahuja Chengxiang Wang Key Laboratory for Liquid‑Solid Structural Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061People’s Republic of China Condensed Matter Theory Department of Physics and AstronomyUppsala UniversityUppsala 75120Sweden

The risk of flammability is an unavoidable issue for gel polymer electrolytes(GPEs).Usually,flameretardant solvents are necessary to be used,but most of them would react with anode/cathode easily and cause serious interfacial instability,which is a big challenge for design and application of nonflammable ***,a nonflammable GPE(SGPE)is developed by in situ polymerizing trifluoroethyl methacrylate(TFMA)monomers with flame-retardant triethyl phosphate(TEP)solvents and LiTFSI–LiDFOB dual lithium *** is strongly anchored to PTFMA matrix via polarity interaction between-P=O and-CH_(2)CF_(3).It reduces free TEP molecules,which obviously mitigates interfacial reactions,and enhances flame-retardant performance of TEP *** TEP molecules are also inhibited in solvation of Li^(+),leading to anion-dominated solvation sheath,which creates inorganic-rich solid electrolyte interface/cathode electrolyte interface *** coordination structure changes Li^(+)transport from sluggish vehicular to fast structural transport,raising ionic conductivity to 1.03 mS cm^(-1) and transfer number to 0.41 at 30℃.The Li|SGPE|Li cell presents highly reversible Li stripping/plating performance for over 1000 h at 0.1 mA cm^(−2),and 4.2 V LiCoO_(2)|SGPE|Li battery delivers high average specific capacity>120 mAh g^(−1) over 200 *** study paves a new way to make nonflammable GPE that is compatible with Li metal anode.

关键词： Anchoring effect Nonflammable gel electrolyte In situ cross-linked Electrode-electrolyte interface Li metal battery

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Operation Risk Analysis of Electric Vehicle With Ultra-fast Charging Integrated to Distribution Network Considering the Bearing Capacity of Power System

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Dianwang Jishu/Power System Technology 2025年第1期49卷 187-197页

作者： Xu, Yanchun Li, Sijia zhang, tao Mi, Lu Hubei Provincial Key Laboratory for Operation and Control of Cascaded Hydropower Station China Three Gorges University Hubei Province Yichang 443002 China Department of Electrical and Computer Engineering Texas A & M University TX 77840 United States

At present, the access of distributed generation and electric vehicles with ultra-fast charging to the distribution network will increase the operational risk of the system. Aiming at the problem that the existing risk assessment indicators fail to consider the system capacity effectively, this paper proposed a comprehensive index of risk assessment of distribution networks considering the power system's capacity. The distributed generation output model and the electric vehicle load model with ultra-fast charging were first constructed. Then, the index based on the distribution entropy theory was used to measure the risk caused by the over-limit of state variables such as voltage and power and the uncertainty of their distribution. The index based on the Theil entropy theory was introduced to measure the risk caused by the equilibrium degree of the incremental distribution of state variables after the load impacted the system. The weight analysis method combining the order relationship method and the objective weighting method was used to evaluate the system risk comprehensively. Finally, the rationality of the comprehensive index was calculated and analyzed by testing the IEEE 33-node system. The results show that the comprehensive index proposed can effectively evaluate the potential risk when the system does not exceed the limit and consider that the ultra-fast charging of electric vehicles will change the time series distribution characteristics of comprehensive risk. The research in this paper can provide theoretical guidance for the safe operation of electric vehicles. with ultra-fast charging connected to the distribution network. © 2025 Power System Technology Press. All rights reserved.

关键词： Risk analysis

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Deep Reinforcement Learning Based Mobile Robot Navigation:A Review

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Tsinghua Science and Technology 2021年第5期26卷 674-691页

作者： Kai Zhu tao zhang the Department of Automation Tsinghua UniversityBeijing 100084China the Beijing National Research Center for Information Science and Technology Tsinghua UniversityBeijing 100084China

Navigation is a fundamental problem of mobile robots,for which Deep Reinforcement Learning(DRL)has received significant attention because of its strong representation and experience learning *** is a growing trend of applying DRL to mobile robot *** this paper,we review DRL methods and DRL-based navigation *** we systematically compare and analyze the relationship and differences between four typical application scenarios:local obstacle avoidance,indoor navigation,multi-robot navigation,and social ***,we describe the development of DRL-based ***,we discuss the challenges and some possible solutions regarding DRL-based navigation.

关键词： mobile robot navigation obstacle avoidance deep reinforcement learning

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DEM Analysis of Single-Particle Crushing Considering the Inhomogeneity of Material Properties

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Acta Mechanica Solida Sinica 2022年第1期35卷 26-39页

作者： tao zhang Wenxiong Huang College of Mechanics and Materials Hohai UniversityNanjing 211100China

Crushing characteristics of single particles are the basis of granular material simulation with discrete element method(DEM).To improve the universality and precision of crushable DEM model,inhomogeneous stiffness and strength properties are introduced into the bonded particle method,with which the Weibull distribution and size effect of particle strength can be reproduced without deleting elementary *** issues of particle strength and carrying capacity under complex contact conditions are investigated in this work by symmetric loading tests,asymmetric loading tests,and ball-ball loading *** of numerical experiments indicate that particle carrying capacity is significantly influenced by coordination numbers,the symmetry of contact points,as well as the relative size of its *** conditions also show impact on single-particle crushing categories and the origin position of inner particle *** existing stress indexes and assumptions of particle crushing criterion are proved to be inappropriate for general loading *** the inherent inhomogeneity and contact conditions of particles should be taken into consideration in the simulation of granular materials.

关键词： Bonded particle method Inhomogeneous properties Size effect Coordination number Symmetry Relative size

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面向海上风电直流汇聚的四象限DC/DC变换器反向运行策略

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供用电 2025年第1期42卷 52-63页

作者：张帅王辉李欢王成张涛李庆民山东大学电气工程学院山东济南250061 南方电网科学研究院有限责任公司广东广州510663 华北电力大学电气与电子工程学院北京102206 国网山东省电力公司德州供电公司山东德州253000

直流汇聚与远距离传输并网的海上风电全直流系统与交流系统相比具有诸多优点,但目前尚有系统拓扑、运维及可靠性等诸多问题未解决。直流汇聚系统现有方案故障恢复与黑启动需要的能量多依赖于独立的反向拓扑,增大了运行成本。利用提出的... 详细信息

直流汇聚与远距离传输并网的海上风电全直流系统与交流系统相比具有诸多优点,但目前尚有系统拓扑、运维及可靠性等诸多问题未解决。直流汇聚系统现有方案故障恢复与黑启动需要的能量多依赖于独立的反向拓扑,增大了运行成本。利用提出的新型四象限隔离型DC/DC变换器拓扑的自身特性,提出和设计实现了拓扑反向重构与能量传输,为风场故障恢复与黑启动提供了低成本辅助方案。该拓扑利用反并联晶闸管构成串联谐振DC/DC变换器二次侧电路,可实现DC/DC变换器的四象限运行。首先,重点分析了拓扑反向运行模式工作原理及参数关系,并设计了反向电压闭环控制策略。其次,利用分段状态空间方程得到变换器在电感电流连续模式(continuous current mode,CCM)以及2种电感电流断续模式(discontinuous current mode,DCM)下的谐振变量时域表达式,并利用其获得反向运行时的谐振电流应力。通过时域分析法和功率守恒推导了电压增益与品质因数、开关频率之间的数学关系,划分了反向运行时的5种工况,并设计了控制策略。最后,通过MATLAB/Simulink仿真以及样机实验验证了反向运行策略的有效性。

关键词： DC/DC变换器黑启动反并联晶闸管四象限运行时域分析法

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Frame Work of Data Envelopment Analysis—A Model to Evaluate the Environmental Efficiency of China'S Industrial Sectors

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Biomedical and Environmental Sciences 2009年第1期22卷 8-13页

作者： tao zhang Department of Economics National University of lreland Galway Ireland

Objective To evaluate the environmental and technical efficiencies of China＇s industrial sectors and provide appropriate advice for policy makers in the context of rapid economic growth and concurrent serious environmental damages caused by industrial pollutants. Methods A data of envelopment analysis （DEA） framework crediting both reduction of pollution outputs and expansion of good outputs was designed as a model to compute environmental efficiency of China＇s regional industrial systems. Results As shown by the geometric mean of environmental efficiency, if other inputs were made constant and good outputs were not to be improved, the air pollution outputs would have the potential to be decreased by about 60% in the whole China. Conclusion Both environmental and technical efficiencies have the potential to be greatly improved in China, which may provide some advice for policy-makers.

关键词： Technical efficiency Environmental efficiency Directional distance function Technical-environmentalefficiency Data of envelopment analysis China

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Adaptive Prescribed Performance Control for Flexible Spacecraft with Input Saturation and Actuator Misalignment

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Tsinghua Science and Technology 2019年第6期24卷 694-705页

作者： Jiawei tao tao zhang Yongfang Nie Department of Automation Tsinghua UniversityBeijing 100084China Department of Strategic Missile and Underwater Weapon Naval Submarine AcademyQingdao 266071China

In this paper, a flexible spacecraft attitude control scheme that guarantees vibration suppression and prescribed performance on transient-state behavior is proposed. Here, parametric uncertainty, external disturbance, unmeasured elastic vibration, actuator saturation, and even configuration misalignment are considered. To guarantee prescribed performance bounds on the transient-and steady-state control errors, a performance constrained control law is formulated with an error transformed function. An elastic modal observer is employed to estimate the unmeasured flexible modal variables, and a command filter is adopted to avoid the tedious analytical computations of time derivatives of virtual control inherent in the control design. Subsequently, a novel auxiliary system is developed to compensate the adverse effects of the actuator saturation constraints, and a compensation term is integrated into the control law to tackle the configuration misalignment. A comparative simulation study is carried out to illustrate the effectiveness and advantages of the proposed approach.

关键词： flexible spacecraft modal observer vibration suppression prescribed performance input saturation actuator misalignment

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Asymptotic Properties in Semiparametric Partially Linear Regression Models for Functional Data

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Acta Mathematicae Applicatae Sinica 2013年第3期29卷 631-644页

作者： tao zhang College of Science Guangxi University of Technology School of Mathematics and Statistics Yunnan University

We consider the semiparametric partially linear regression models with mean function XTβ ＋ g（z）, where X and z are functional data. The new estimators of β and g（z） are presented and some asymptotic results are given. The strong convergence rates of the proposed estimators are obtained. In our estimation, the observation number of each subject will be completely flexible. Some simulation study is conducted to investigate the finite sample performance of the proposed estimators.

关键词： longitudinal data functional data semiparametric partially linear regression models asymptotic properties

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Robust Adaptive Attitude Maneuvering and Vibration Reducing Control of Flexible Spacecraft Under Input Saturation

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Transactions of Nanjing University of Aeronautics and Astronautics 2019年第2期36卷 98-108页

作者： tao Jiawei zhang tao Department of Automation Tsinghua University

A robust adaptive control scheme is proposed for attitude maneuver and vibration suppression of flexible spacecraft in situations where parametric uncertainties,external disturbances,unmeasured elastic vibration and input saturation constraints exist. The controller does not need the knowledge of modal variables but the estimates of modal variables provided by appropriate dynamics of the controller. The requirements to know the system parameters and the bound of the external disturbance in advance are also eliminated by adaptive updating technique. Moreover,an auxiliary design system is constructed to analyze and compensate the effect of input saturation,and the state of the auxiliary design system is applied to the procedure of control design and stability analysis. Within the framework of the Lyapunov theory,stabilization and disturbance rejection of the overall system are ensured. Finally,simulations are conducted to study the effectiveness of the proposed control scheme,and simulation results demonstrate that the precise attitude control and vibration suppression are successfully achieved.

关键词： flexible spacecraft attitude maneuver modal observer vibration suppression input constraints

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Relative Position and Attitude Control for Drag-Free Satellite with Prescribed Performance and Actuator Saturation

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Transactions of Nanjing University of Aeronautics and Astronautics 2019年第4期36卷 617-627页

作者： tao Jiawei zhang tao Department of Automation Tsinghua UniversityBeijing 100084P.R.China

An adaptive prescribed performance control scheme is proposed for the drag free satellite in the presence of actuator saturation and external *** relative translation and rotation dynamics between the test mass and outer satellite are firstly *** guarantee prescribed performance bounds on the transient and steady control errors of relative states,a performance constrained control law is formulated with an error transformed *** addition,the requirements to know the system parameters and the upper bound of the external disturbance in advance have been eliminated by adaptive updating technique.A command filter is concurrently used to overcome the problem of explosion of complexity inherent in the backstepping control ***,a novel auxiliary system is constructed to compensate the adverse effects of the actuator saturation *** is proved that all signals in the closed?loop system are ultimately bounded and prescribed performance of relative position and attitude control errors are ***,numerical simulation results are given to demonstrate the effectiveness of the proposed approach.

关键词： relative position and attitude control drag‑free satellite command filter prescribed performance actuator saturation

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