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Correlation between multi-factor phase diagrams and complex electrocaloric behaviors in PNZST antiferroelectric ceramic system

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Journal of Advanced Ceramics 2023年第3期12卷 463-473页

作者： Junjie Li Ruowei Yin Jianting Li Xiaopo Su Yanjing Su Lijie Qiao Yang Baia Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Sichuan Province Key Laboratory of Information Materials and Devices Application College of Optoelectronic EngineeringChengdu University of Information TechnologyChengdu 610225China Faculty of Mechanical Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China

Ferroelectric(FE)phase transition with a large polarization change benefits to generate large electrocaloric(EC)effect for solid-sate and zero-carbon cooling ***,most EC studies only focus on the single-physical factor associated phase ***,we initiated a comprehensive discussion on phase transition in Pb_(0.99)Nb_(0.02)[(Zr_(0.6)Sn_(0.4))1−xTix]_(0.98)O_(3)(PNZST100x)antiferroelectric(AFE)ceramic system under the joint action of multi-physical factors,including composition,temperature,and electric *** to low energy barrier and enhanced zero-field entropy,the multi-phase coexistence point(x=0.12)in the composition–temperature phase diagram yields a large positive EC peak of maximum temperature change(ΔT_(max))=2.44 K(at 40 kV/cm).Moreover,the electric field–temperature phase diagrams for four representative ceramics provide a more explicit guidance for EC evolution *** the positive EC peaks near various phase transition temperatures,giant positive EC effects are also brought out by the electric field-induced phase transition from tetragonal AFE(AFET)to low-temperature rhombohedral FE(FER),which is reflected by a positive-slope boundary in the electric field–temperature phase diagram,while significant negative EC responses are generated by the phase transition from AFET to high-temperature multi-cell cubic paraelectric(PEMCC)with a negative-slope phase *** work emphasizes the importance of phase diagram covering multi-physical factors for high-performance EC material design.

关键词： antiferroelectric(AFE) electrocaloric(EC)effect phase diagram phase transition

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Red/NIR emission carbonized polymer dots based on citric acid-benzoylurea and their application in lymph nodes imaging

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Chinese Chemical Letters 2023年第11期34卷 225-230页

作者： Feishi Shan Tingrui Zhang Chengshuang Liao Xue Yue Jing Zhang Li Yan Yanman Liu Zhixing Cao Min Wang Yahui Zhang Leyong Wang Zhouyu Wang Xiaoqi Yu Sichuan Engineering Research Center for Molecular Targeted Diagnostic&Therapeutic Drugs Asymmetric Synthesis and Chiral Technology Key Laboratory of Sichuan ProvinceResearch and Application of Small Organic Chiral Molecules Key Laboratory of Yibin CityDepartment of ChemistryXihua UniversityChengdu 610039China State Key Laboratory of Southwestern Chinese Medicine Resources Pharmacy SchoolChengdu University of Traditional Chinese MedicineChengdu 611137China State Key Laboratory of Analytical Chemistry for Life Science Key Laboratory of Mesoscopic Chemistry of MOEJiangsu Key Laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China

Identification of lymph nodes(LNs)is critical for studies of the structure,the role in disease development,and the efficacy of disease *** polymer dots(CPDs)are expected to be potential LNs-targeted imaging agents due to their excellent properties with special structure,better photoluminescence(PL)and great ***,a red/near infrared(NIR)emission CPDs(RCPDs)with one and two-photon bioimaging based on citric acid(CA)and benzoylurea(BU)are ***,the RCPDs are capable of targeting LNs for *** homing has been demonstrated to be the cellular mechanism of RCPDs target LNs *** work has developed a new nanomaterial for targeted imaging of LNs,while the biological applications of CPDs have been expanded and deepened.

关键词： Carbonized polymer dots Red/NIR emission LNs-targeting Lymphocyte homing

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用于钎焊C/C复合材料的稀土改性还原氧化石墨烯增强AgCuTi复合钎料

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Journal of Central South University 2024年第5期31卷 1398-1411页

作者：吴靓李月陈锦微张汭张乾坤肖逸锋 School of Mechanical Engineering and Mechanics Xiangtan UniversityXiangtan 411105China Key Laboratory of Welding Robot and Application Technology of Hunan Province Xiangtan 411105China Welding Automation Equipment Engineering Research Center of Hunan Province Xiangtan 411105China

为了解决钎焊接头中脆性化合物的形成问题,我们设计了一种创新性的稀土改性还原氧化石墨烯增强AgCuTi复合钎料,进而获得了以Ag-Cu共晶为主要组织且脆性化合物生成量合适的钎焊接头。对比分析了有无稀土Ce改性的复合钎料的成分和显微组织... 详细信息

为了解决钎焊接头中脆性化合物的形成问题,我们设计了一种创新性的稀土改性还原氧化石墨烯增强AgCuTi复合钎料,进而获得了以Ag-Cu共晶为主要组织且脆性化合物生成量合适的钎焊接头。对比分析了有无稀土Ce改性的复合钎料的成分和显微组织,结果表明,经Ce改性后的还原氧化石墨烯在钎料中更加均匀分散。比较了分别采用有无Ce改性的钎料钎焊C/C复合材料-C/C复合材料接头的界面微观结构,并研究了石墨烯含量对接头组织和性能的影响。结果表明,由于经Ce改性的钎料中的还原氧化石墨烯分散性更好,从而细化了焊缝组织,且物相分布更均匀,使得接头的剪切强度明显提高。当石墨烯含量为0.5 wt.%时,使用Ce改性的钎料所得钎焊接头的平均剪切强度最高,为31.82 MPa,提高了50%。

关键词：稀土改性还原氧化石墨烯复合钎料 C/C复合材料钎焊

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Decorrelation Proportionate Normalized Least Mean M-estimate Algorithm with Variable Step-Size 22

Decorrelation Proportionate Normalized Least Mean M-estimate...

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5th International Conference on Signal Processing and Machine Learning, SPML 2022

作者： Huang, Zongxin Yu, Yi Fan, Yongcun Li, Ke School of Information Engineering Robot Technology Used for Special Environment Key Laboratory of Sichuan Province Southwest University of Science and Technology Sichuan Mianyang China

ISBN: (纸本)9781450396912

To improve the performance of the proportionate normalized least mean M-estimate (PNLMM) algorithm, this paper proposes a variable step-size adaptive decorrelation PNLMM (VSS-AD-PNLMM) algorithm. First, an adaptive decorrelation scheme is designed to speed up the algorithm convergence when aiming at highly correlated input signals. Second, by minimizing the a posterior error, we derived a variable step-size mechanism to solve the trade-off between fast convergence rate and low steady-state misadjustment. Computer simulations in impulsive noises are conducted to demonstrate the effectiveness of the proposed algorithm. © 2022 Association for Computing Machinery.

关键词： Impulse noise

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Structure Design and Kinematics Analysis and Experiment of Rope-driven Continuum robot

Structure Design and Kinematics Analysis and Experiment of R...

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Chinese Control and Decision Conference, CCDC

作者： Junlei Wang Hongwei Liu Qianyi Meng Robot Technology Used for Special Environment Key Laboratory of Sichuan Province Mianyang China

ISBN: (数字)9798350387780

ISBN: (纸本)9798350387797

In this paper, aiming at the charging scenario of new energy vehicles, a rope-driven continuous robot structure is designed. Combining the modeling methods of flexible robot and winding rigid robot, a kinematic model of rod-driven continuum robot is established, and a method to solve its inverse kinematics is designed according to the pose of the target point given by the continuum robot in the actual scene. A numerical analysis method based on Newton-Raphson method is designed to solve the complex inverse kinematics evaluation problem. The calculated Angle is substituted into the forward kinematics of the continuum robot and the transformation relationship between the driving rope length, and the change of the driving rope length is obtained, so as to achieve the target pose of the robot driven by the driving rope. Through experiments and modeling, the actual results of experimental calculation on a rope-driven continuum robot with a total length of 990mm were compared with the results of kinematics modeling to prove the feasibility of the method. The driving rope can control the continuum robot to achieve the target pose.

关键词： robot kinematics Windings Kinematics Bending Motors Numerical models Continuum robots

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Off-policy correction algorithm for double Q network based on deep reinforcement learning

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IET Cyber-Systems and robotics 2023年第4期5卷 16-26页

作者： Qingbo Zhang Manlu Liu Heng Wang Weimin Qian Xinglang Zhang School of Information Engineering Southwest University of Science and TechnologyMianyangChina Robot Technology Used for Special Environment Key Laboratory of Sichuan Province MianyangChina Tianfu Institute of Research and Innovation Southwest University of Science and TechnologyChengduChina

A deep reinforcement learning(DRL)method based on the deep deterministic policy gradient(DDPG)algorithm is proposed to address the problems of a mismatch between the needed training samples and the actual training samples during the training of in-telligence,the overestimation and underestimation of the existence of Q-values,and the insufficient dynamism of the intelligence policy *** method introduces the Actor-Critic Off-Policy Correction(AC-Off-POC)reinforcement learning framework and an improved double Q-value learning method,which enables the value function network in the target task to provide a more accurate evaluation of the policy network and converge to the optimal policy more quickly and stably to obtain higher value *** method is applied to multiple MuJoCo tasks on the Open AI Gym simulation *** experimental results show that it is better than the DDPG algorithm based solely on the different policy correction framework(AC-Off-POC)and the conventional DRL *** value of returns and stability of the double-Q-network off-policy correction algorithm for the deep deterministic policy gradient(DCAOP-DDPG)pro-posed by the authors are significantly higher than those of other DRL algorithms.

关键词： neural network Q-learning reinforcement learning

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A Super Pixel Segmentation Algorithm for SAR Images Based on APKSLIC 2

A Super Pixel Segmentation Algorithm for SAR Images Based on...

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2nd International Conference on Artificial Intelligence and Intelligent Information Processing, AIIIP 2023

作者： Gong, Li Zhou, Jinzhi Zhang, Wengrong Liu, Kaijing Hu, Zhen College of Information Engineering Southwest University of Science and Technology Mianyang621010 China Southwest University of Science and Technology Robot Technology Used for Special Environment Key Laboratory of Sichuan Province Mianyang621010 China

ISBN: (纸本)9798350371451

To improve the accuracy of Simple Linear Iterative Clustering (SLIC) algorithm in image segmentation, a superpixel segmentation algorithm based on adaptive parameters and Kuan filter mean estimation is proposed. This algorithm adaptively generates feature equalization parameter g based on the specific situation of the image, and then combines it with the average grayscale difference and spatial fluctuation difference constructed by Kuan filter estimation to improve the superpixel segmentation effect of SAR images. The experimental results show that compared with the other three superpixel segmentation algorithms, the proposed algorithm has a recall improvement of at least 0.7%, an undersegmentation error rate reduction of at least 5%, and an average running time reduction of at least 15%. © 2023 IEEE.

关键词： Synthetic aperture radar

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Three-dimensional macroscopic absorbents: From synergistic effects to advanced multifunctionalities

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Nano Research 2024年第3期17卷 1952-1983页

作者： Shijie Zhang Di Lan Xingliang Chen Yueyuan Gu Junwen Ren Suxuan Du Shichang Cai Xiaomiao Zhao Zhiwei Zhao Guanglei Wu School of Material Science and Engineering Henan University of TechnologyZhengzhou 450001China School of Materials Science and Engineering Hubei University of Automotive TechnologyShiyan 442002China Key Laboratory of Clean Dyeing and Finishing Technology of Zhejiang Province Shaoxing UniversityShaoxing 312000China School of Resources Environment and Safety Engineering University of South ChinaHengyang 421001China College of Electrical Engineering Sichuan UniversityChengdu 610065China Institute of Materials for Energy and Environment State Key Laboratory of Bio-fibers and Eco-textilesCollege of Materials Science and EngineeringQingdao UniversityQingdao 266071China Key Laboratory of Engineering Dielectrics and Its Application Ministry of EducationSchool of Electrical&Electronic EngineeringHarbin University of Science and TechnologyHarbin 150080China

The accelerated arriving of 5G era has brought a new round of intelligent transformation which will completely emancipate smart terminal *** the subsequent deleterious effect of electromagnetic wave on electronic devices is increasingly serious,driving the growth of next-generation electromagnetic wave *** a tactful combination of components and structures,three-dimensional(3D)macroscopic absorbents with fascinating synergy afford exceptional electromagnetic wave absorption,and tremendous efforts have been devoted to this ***,in terms of macroscopic absorbents and their synergistic effect,few reviews are proposed to comb the latest achievements and detailed *** review article focuses on the synergistic effect of macro-architectured absorbents mainly including structure-induced synergy,structure-components synergy,and multiple-components induced *** then the potential construction principles and strategies of macroscopic absorbents are ***,the key information for structures and components manipulation including nano-micro design and components regulation is further dissected by critically selected cutting-edge 3D macroscopic ***,a brief summary of multifunctional electromagnetic wave absorbents(EWAs)-based macroscopic structures is ***,the development prospects and challenges of these materials are discussed.

关键词： three-dimensional(3D)structures synergistic effect electromagnetic wave absorption absorption mechanism multifunction

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REVERBERATION ROBUST TIME DELAY ESTIMATION BASED ON MULTICHANNEL MARGINAL MUTUAL INFORMATION 28

REVERBERATION ROBUST TIME DELAY ESTIMATION BASED ON MULTICHA...

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28th International Congress on Sound and Vibration, ICSV 2022

作者： Wang, Miaomiao He, Hongsen Yu, Yi School of Information Engineering Robot Technology Used for Special Environment Key Laboratory of Sichuan Province Southwest University of Science and Technology Mianyang China

ISBN: (纸本)9789811850707

Time delay estimation (TDE) is an important part of speaker localization in hands-free communication systems. To improve the TDE performance in room acoustic environments, this work proposes a robust TDE approach from an information theory perspective. A parameterized multichannel marginal mutual information matrix is first defined, based on which a parameterized multichannel marginal mutual information coefficient is then formulated to establish the time delay estimator. Simulation results demonstrate that the proposed time delay estimation method can effectively exploit the redundancy among multiple microphones to suppress the adverse effect of room reverberation, especially under heavily reverberant conditions. © International Institute of Acoustics and Vibration (IIAV), 2022.

关键词： Reverberation

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Explore the collision safety of tram and passenger vehicle under disparate right of way 6

Explore the collision safety of tram and passenger vehicle u...

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6th International Conference on Traffic Engineering and Transportation System, ICTETS 2022

作者： Guo, Yueling Liu, Yugang Xiao, Hanlin Ye, Jinsong School of Transportation and Logistics Southwest Jiaotong University Sichuan Province Chengdu610031 China National Engineering Laboratory of Integrated Transportation Big Data Application Technology Southwest Jiaotong University Sichuan Province Chengdu610031 China National United Engineering Laboratory of Integrated and Intelligent Transportation Southwest Jiaotong University Sichuan Province Chengdu610031 China Key Laboratory of Transport Industry of Big Data Application Technologies for Comprehensive Transport China Academy of Transportation Sciences Beijing100029 China

ISBN: (纸本)9781510663053

Unlike traditional railway vehicles, the particularity of tram right of way determines the multiple and diversity of its accident forms. Based on the analysis of accident data at home and abroad, this paper determines the three road right management modes with the highest accident rate. On this basis, three collision scenarios are designed between a three-module 100% low-floor tram and various types of passenger vehicles. In this paper, we innovatively use PC-Crash crash simulation combined with SPSS quantitative analysis to study the accident characteristics of tram and passenger vehicle collisions under disparate right of way. The results show that the occupant's living space is smaller in 45° side impact under the semi-independent right of way. Under the mixed right of way, when the tram is used as a rear-end vehicle, the collision interface force is more intense. At the same collision speed, the displacement of the vehicle body and the invasion of the living space will be larger under the mixed right of way. Finally, based on the simulation results and causal analysis method, an accurate and highly flexible accident cause analysis framework is formed. From the aspects of single influence and comprehensive influence, the factors affecting the safety of tram operation under diverse road right management modes are analyzed, and tailored suggestions are given to improve the safety of the track system. © 2023 SPIE.

关键词： Highway planning

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