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Manipulating Zr/Ti ratio based on phase diagram for large electrocaloric effects with multiple target operation temperatures in PLZT ceramics

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Journal of Advanced Ceramics 2024年第9期13卷 1422-1431页

作者： Junjie Li Ruowei Yin Zhe Xiong Yizheng Bao Xing Zhang Wenjuan Wu Lezhong Li Yang Bai Sichuan Province Key Laboratory of Information Materials and Devices Application College of Optoelectronic Engineeringand Chengdu IC Valley Industrial CollegeChengdu University of Information TechnologyChengdu 610225China Beijing Advanced Innovation Center for Materials Genome Engineering and Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Chengdu Hongming Electronics Co. Ltd.Chengdu 610199China Key Laboratory of Inorganic Functional Materials and Devices Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201800China Sichuan Meteorological Optoelectronic Sensor Technology and Application Engineering Research Center Chengdu University of Information TechnologyChengdu 610225China

Ferroelectric phase transition has been identified as a promising avenue for designing high-performanceelectrocaloric materials for zero-emission and solid-state refrigeration. However, extensive research has been limited todeveloping ferroelectric materials with large electrocaloric effects near room temperature, preventing them from meetingdiverse refrigeration requirements. In this study, by leveraging the room-temperature phase diagram of the (PbLa)(ZrTi)O_(3)solution, we prepared a series of Pb_(0.775)La_(0.15)Zr_(x)Ti_(1−x)O_(3) bulk ceramics spanning the ferroelectric and relaxor ferroelectricphase regions. This enabled the attainment of various phase transition features and temperatures. Finally, largeelectrocaloric effects, coupled with adjustable operation temperatures ranging from 150 to −45℃, are successfullyachieved through manipulation of the Zr/Ti ratio. This comprehensive range of operation temperatures effectively addressesdiverse refrigeration application requirements, ranging from industrial equipment to freezer cabinets. This work not onlyunderscores the expansion of the electrocaloric refrigeration application domain but also proposes a material designstrategy tailored to meet these evolving demands.

关键词： electrocaloric effect phase transition phase diagram ferroelectric ceramics

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Adaptive Tracking Algorithm for Hypersonic Maneuvering Target Based on Bi-satellite Positioning

Adaptive Tracking Algorithm for Hypersonic Maneuvering Targe...

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2024 China Automation Congress, CAC 2024

作者： Fu, Zhumu Wan, Dongfeng Wang, Zhikai Tao, Fazhan School Information Engineering Henan University of Science and Technology National Key Laboratory of Air-based Information Perception and Fusion Luoyang China

ISBN: (纸本)9798350368604

Due to the hypersonic maneuvering target’s fast flight speed and wide trajectory range, it is impractical to track its entire path using ground-based radar. Based on the Bi-satellite positioning measurement model with line of sight intersection, this paper integrate the Strong Tracking Filter (STF) with the Unscented Kalman Filter (UKF) algorithm, incorporating two adaptive coefficients to adjust the filter gain and noise covariance matrix dynamically. This approach aims to track and estimate the trajectory of a hypersonic glide vehicles (HGVs) based on observations from two LEO early warning satellites within the space-based infrared system. Through simulation, this paper presents the results of tracking target trajectories using an adaptive strong tracking Unscented Kalman Filter (ASTUKF) algorithm based on Bi-satellite positioning. The simulation and experimental results demonstrate that the proposed algorithm achieves a 28.95% and 50.36% lower total speed RMSE compared to the other two algorithms, respectively. Similarly, the total position RMSE is reduced by 30.46% and 51.99%, respectively, when compared with the same algorithms. © 2024 IEEE.

关键词： Kalman filters

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A healable, mechanically robust and ultrastretchable ionic conductive elastomer for durably wearable sensor

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Nano Research 2024年第4期17卷 3369-3378页

作者： Guoxian Zhang Chunmei Li JiaoJun Tan Mingqi Wang Yafeng Ren Feijie Ge Qiuyu Zhang Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi'an 710072China College of Bioresources Chemical and Materials Engineering National Demonstration Center for Experimental Light Chemistry Engineering EducationShaanxi University of Science&TechnologyXi’an 710021China

The ionic conductive elastomers show great promise in multifunctional wearable electronics,but they currently suffer from liquid leakage/evaporation or mechanical *** ionic conductive elastomers integrating non-volatility,mechanical robustness,superior ionic conductivity,and ultra-stretchability remains urgent and ***,we developed a healable,robust,and conductive elastomer via impregnating free ionic liquids(ILs)into the ILs-multigrafted poly(urethane-urea)(PUU)elastomer networks.A crucial strategy in the molecular design is that imidazolium cations are largely introduced by double-modification of PUU and centipede-like structures are obtained,which can lock the impregnated ILs through strong ionic *** this system,the PUU matrix contributes outstanding mechanical properties,while the hydrogen bonds and ionic interactions endow the elastomer with self-healing ability,conductivity,as well as non-volatility and *** fabricated ionic conductive elastomers show good conductivity(3.8×10^(-6) S·cm^(-1)),high mechanical properties,including tensile stress(4.64 MPa),elongation(1470%),and excellent healing ability(repairing efficiency of 90%after healing at room temperature for 12 h).Significantly,the conductive elastomers have excellent antifatigue properties,and demonstrate a highly reproducible response after 1000 uninterrupted extension-release *** work provides a promising strategy to prepare ionic conductive elastomers with excellent mechanical properties and stable sensing capacity,and further promote the development of mechanically adaptable intelligent sensors.

关键词： ionic conductive elastomers poly(urethane-urea)(PUU) ionic interactions centipede-like self-healing

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Attacker-Defender Game for Infrastructure Networks Based on Intuitionistic Fuzzy Sets

Attacker-Defender Game for Infrastructure Networks Based on ...

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2023 IEEE International Conference on Unmanned systems, ICUS 2023

作者： Li, Zhe Liu, Jin Dong, Yibo Ren, Jiaqi Li, Weili National University of Defense Technology Science and Technology on Information Systems Engineering Laboratory Changsha China

ISBN: (纸本)9798350316308

In order to solve the problem that it is difficult to effectively express and quantify various uncertain factors in infrastructure network attacker-defender game modelling, an infrastructure network attacker-defender game model based on intuitionistic fuzzy sets is established by combining game theory with intuitionistic fuzzy sets. After converting the exact payoff matrix into an intuitionistic fuzzy matrix according to certain rules, the nonlinear programming solver is used to solve the model to obtain the equilibrium strategy of both sides. Finally, the experimental results are analysed to show the effectiveness and feasibility of the model. © 2023 IEEE.

关键词： Nonlinear programming

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One-DOF Rigid and Flat-Foldable Origami Polyhedrons with Slits

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Acta Mechanica Solida Sinica 2023年第4期36卷 479-490页

作者： Yuehao Zhang Yuanqing Gu Yan Chen Ming Li Xiao Zhang School of Mechanical Engineering Tianjin UniversityTianjin 300350China Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education Tianjin UniversityTianjin 300350China Space Structure and Mechanism Technology Laboratory of China Aerospace Science and Technology Group Co.Ltd Aerospace System Engineering ShanghaiShanghai 201109China

Rigid origami has great potential in aerospace applications,especially deployable polyhedrons with one degree of freedom(DOF)and flat-foldability,whose types are few to *** this paper,we create a novel foldable cube and a rhombic dodecahedron by introducing slits and diagonal creases to the surfaces,whose one-DOF rigid and flat-foldable properties are verified by kinematic ***,based on the isohedral quadrilateral transform,we project the creases and slits of the rhombic dodecahedron onto a tetrahedron to obtain a novel foldable tetrahedron that has two flat-foldable motion paths due to the existence of collinear *** the second path,unnecessary creases are removed,and an origami tetrahedron with simplified creases is *** origami tetrahedrons possess a small folded *** analysis reveals that these newly discovered origami polyhedrons are flat-foldable with one DOF,demonstrating favorable application prospects for space architectures and extraterrestrial habitats.

关键词： Rigid origami Flat-foldability Cube Rhombic dodecahedron Tetrahedron

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Regulating Effect of Substrate Temperature on Sputteringgrown Ge/Si QDs under Low Ge Deposition

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Journal of Wuhan University of technology(Materials science) 2024年第4期39卷 888-894页

作者：舒启江 YANG Linjing LIU Hongxing 黄鹏儒 Institute of Information Yunnan University of Chinese MedicineKunming 650500China Guangxi Key Laboratory of Information Materials and Guangxi Collaborative Innovation Center of Structure and Property for New Energy and Materials School of Material Science&EngineeringGuilin University of Electronic TechnologyGuilin 541004China

The effect of deposition temperature on the morphology and optoelectronic performance of Ge/Si QDs grown by magnetron sputtering under low Ge deposition(~4 nm)was investigated by atomic force microscopy,Raman spectroscopy,and photoluminescence(PL)*** experimental results indicate that temperatures higher than 750℃effectively increase the crystallization rate and surface smoothness of the Si buffer layer,and temperatures higher than 600℃significantly enhance the migration ability of Ge atoms,thus increasing the probability of Ge atoms meeting and nucleating to form QDs on Si buffer layer,but an excessively high temperature will cause the QDs to undergo an Ostwald ripening process and thus develop into super large *** addition,some PL peaks were observed in samples containing small-sized,high-density Ge QDs,the photoelectric properties reflected by these peaks were in good agreement with the corresponding structural characteristics of the grown *** results demonstrate the viability of preparing high-quality QDs by magnetron sputtering at high deposition rate,and the temperature effect is expected to work in conjunction with other controllable factors to further regulate QD growth,which paves an effective way for the industrial production of QDs that can be used in future devices.

关键词： Ge/Si QDs deposition temperatures evolution law photoelectric performance

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An Explainable Recommendation Method based on Diffusion Model 9

An Explainable Recommendation Method based on Diffusion Mode...

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9th International Conference on Big Data and information Analytics, BigDIA 2023

作者： Guo, Yupu Cai, Fei Chen, Honghui Chen, Chonghao Zhang, Xin Zhang, Menxi National University of Defense Technology Science and Technology on Information Systems Engineering Laboratory Changsha China

ISBN: (纸本)9798350330076

To meet the requirements of precise recommendation in the era of information warfare, there has been a growing interest in explainable recommendations in the field of command and control in recent years. While Variational Autoencoders (VAE) have been effective in generating explanations, diffusion models have shown superior performance in fields like image processing and natural language processing. This paper proposes a Diffusion-based explainable recommendation model (DIEXRS) to enhance the effectiveness of explanations further. The DIEXRS model consists of two processes: diffusion (training) and reverse (inference). User and item embeddings are generated based on their IDs, along with comment embeddings from user comments. These embeddings are incorporated into the diffusion process, where the Transformer model is trained to fit the noise and improve the decoder's decoding capabilities. In the reverse process, a random Gaussian sample and the user's ID are used to obtain the item's ID and corresponding interpretation embedding, providing the recommended interpretation through the decoder. Experimental results on two public datasets demonstrate that the DIEXRS model achieves state-of-the-art performance in interpretable recommendations compared to other baselines. This highlights the potential of diffusion models in enhancing the explainability and effectiveness of recommendation systems © 2023 IEEE.

关键词： Embeddings

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Research on active defense decision-making method for cloud boundary networks based on reinforcement learning of intelligent agent

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High-Confidence Computing 2024年第2期4卷 50-61页

作者： Huan Wang Yunlong Tang Yan Wang Ning Wei Junyi Deng Zhiyan Bin Weilong Li School of Computer Science and Technology Guangxi University of Science and TechnologyLiuzhou 545000China Liuzhou Key Laboratory of Big Data Intelligent Processing and Security Liuzhou 545000China Guangxi Education System Network Security Monitoring Center Liuzhou 545000China Center of Graphics and Information Guangxi ECO-Engineering Vocational&Technical CollegeLiuzhou 545004China

The cloud boundary network environment is characterized by a passive defense strategy,discrete defense actions,and delayed defense feedback in the face of network attacks,ignoring the influence of the external environment on defense decisions,thus resulting in poor defense ***,this paper proposes a cloud boundary network active defense model and decision method based on the reinforcement learning of intelligent agent,designs the network structure of the intelligent agent attack and defense game,and depicts the attack and defense game process of cloud boundary network;constructs the observation space and action space of reinforcement learning of intelligent agent in the non-complete information environment,and portrays the interaction process between intelligent agent and environment;establishes the reward mechanism based on the attack and defense gain,and encourage intelligent agents to learn more effective defense *** designed active defense decision intelligent agent based on deep reinforcement learning can solve the problems of border dynamics,interaction lag,and control dispersion in the defense decision process of cloud boundary networks,and improve the autonomy and continuity of defense decisions.

关键词： Active defense decision-making Cloud boundary network security Intelligent agent reinforcement learning Offensive and defensive game

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Developing modified k–εturbulence models for neutral atmospheric boundary layer flow simulation using OpenFOAM

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Building Simulation 2024年第12期17卷 2281-2295页

作者： Yuanbo Wang Jiqin Li Wei Liu Jiankai Dong Jing Liu School of Architecture Harbin Institute of TechnologyKey Laboratory of Cold Region Urban and Rural Human Settlement Environment Science and TechnologyMinistry of Industry and Information TechnologyHarbin 150090China Tianjin Key Laboratory of Indoor Air Environmental Quality Control School of Environmental Science and EngineeringTianjin University92 Weijin RoadTianjin 300072China Division of Sustainable Buildings Department of Civil and Architectural EngineeringKTH Royal Institute of TechnologyBrinellvägen 2310044 StockholmSweden

Accurate turbulence modeling is essential for simulation studies of urban *** this study,the comprehensive atmospheric boundary layer(ABL)model involving a variable model coefficient and an additional turbulent dissipation source term was implemented using the open-source software *** with consistent inlet wind profiles and rough wall functions of different turbulence variables based on the aerodynamic roughness,the model maintained the horizontal homogeneity ***,a hybrid approach was introduced to consider buildings immersed in ABL flows,enabling automatic transformation of the turbulence model between the region around the buildings and the free flow region away from any ***,the effects of applying different model forms to the airflow field around buildings were evaluated in detail through three-dimensional building cases representing six urban prototypes based on three wind tunnel *** findings indicated that all modified k–εmodels perform well in reproducing the flow data of the CEDVAL and Architectural Institute of Japan(AIJ)experiments consisting of a single building,an array of buildings,and an isolated high-rise ***,the modified k–εmodel with an additional correction term performed poorly in the database of Niigata Institute of technology and the case of complex terrain and urban building configurations,because the correction term inhibited the generation of turbulent kinetic *** addition,from the comparison between the experimental data of all cases,the model with the original formulation of the coefficient performed the best in terms of prediction *** root mean square errors of the normalized velocity were 0.1250,0.0879,0.1145,0.1350,and 0.1492 in different cases,which proved the reliability of this turbulence model.

关键词： urban airflow computational fluid dynamics(CFD) atmospheric boundary layer OpenFOAM turbulence model

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A Survey on Security of UAV Authentication Based on Blockchain under New C2 paradigm 9

A Survey on Security of UAV Authentication Based on Blockcha...

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9th International Conference on Big Data and information Analytics, BigDIA 2023

作者： Zheng, Yaling Liu, Yi Cheng, Ziwen Pan, Yongqi Zhu, Cheng National University of Defense Technology Science and Technology on Information Systems Engineering Laboratory Changsha China

ISBN: (纸本)9798350330076

Advancements in information technology and artificial intelligence have given rise to a new military command and control (C2) paradigm where unmanned aerial vehicles (UAVs) play a critical role. However, due to open wireless communication channels and evolving security challenges for UAVs in this paradigm, traditional centralized authentication methods are no longer sufficient. In this context, this paper conducts a systematic literature review (SLR) approach to explore the application of blockchain technology in UAV authentication. It categorizes and reviews relevant solutions published in recent years, and analyzes the advantages of blockchain in addressing centralized dependencies, cross-domain heterogeneity and other issues. The review finds dynamic management and efficiency improvement are key points needing attention. This paper provides valuable references on integrating UAV identity authentication with blockchain technology under new C2 paradigms. © 2023 IEEE.

关键词： Authentication

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