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High energy storage performance for dielectric film capacitors by designing 1D SrTiO_(3)@SiO_(2) nanofillers

Journal of Advanced Dielectrics 2018年第6期8卷 70-79页

作者： Bing Xie Ling Zhang Mohsin Ali Marwat Yiwei Zhu Weigang Ma pengyuan fan Haibo Zhang School of Materials Science and Engineering State Key Laboratory of Material Processing and Die&Mould Technolog Huazhong University of Science and Technology Wuhan 430074 P.R.China School of Mechanical and Electrical Engineering Shihezi University Shihezi 832003P.R.China

The development of advanced dielectric film materials with high energy storage performance is of critical significance for pulsed power capacitor ***,the low discharged energy density(Ue)of current dielectric film material restricts their further *** this work,core-shell structured SrTiO_(3)@SiO_(2) nanowires(ST@SiO_(2) NWs)fillers are fabricated based on interface engineering for high *** optimized SiO2 insulating layer could effectively confine the mobility of space charge carriers in the interfacial zone between ST NWs and thick SiO2 insulating layer,thus reducing the interfacial polarization between the interface of nanofillers/polymer,which could be used to optimize the electric field strength and electric displacement of the corresponding *** a result,this nanocomposite film simultaneously exhibits enhanced maximum applied electric field(Emax)and(Dmax-Pr)values,thus releasing an ultrahigh discharged energy density of 14.7 J/cm^(3) at 390 MV/m,which is 99%higher than that of the conventional ST/P(VDF-CTFE)(without SiO2 coating)nanocomposite,and it is almost 2.5 times that of pure P(VDF-CTFE).This work demonstrates the superiority of the core-shell structured paraelectric nanowire in enhancing the energy storage performance of dielectric film capacitors,which is expected to guide the design of advanced energy-storage nanocomposites.

关键词： Nanocomposite core-shell structure SrTiO_(3)nanowire interfacial polarization discharged energy density

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Low-temperature sintered(Na_(1/2)Bi_(1/2))TiO_(3)-based incipient piezoceramics for co-fired multilayer actuator application

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Journal of Materiomics 2019年第3期5卷 480-488页

作者： pengyuan fan Yangyang Zhang Shan-Tao Zhang Bing Xie Yiwei Zhu Mohsin Ali Marwat Weigang Ma Kai Liu Liang Shu Haibo Zhang School of Materials Science andEngineering State Key Laboratory of Material ProcessingDie&Mould TechnologyHuazhong University of Science and TechnologyWuhan430074China Information Engineering Institute Huanghe Science and Technology CollegeZhengzhou450000China National Laboratory of Solid State Microstructures Department of Materials Science and EngineeringCollege of Engineering and Applied ScienceCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing210093China Research Centre for Functional Ceramics Ministry of EducationHuazhong University of Science and TechnologyWuhan430074China

Low-temperature sintered(Na_(1/2)Bi_(1/2))_(0.935)Ba_(0.065)Ti_(0.975)(Fe_(1/2)Nb_(1/2))_(0.025)O_(3)(NBT-BT-0.025FN)lead-free incipient piezoceramics were investigated using high-purity Li_(2)CO_(3) as sintering *** the ≤0.5 wt%Li_(2)CO_(3) addition,the introduced Li^(+) cations precede to enter the A-sites of the perovskite lattice to compensate for the A-site *** the addition exceeds 0.5 wt%,the excess Lit cations will occupy B-sites and give rise to the generation of oxygen vacancies,which accelerate the mass transport and thus lower the sintering temperature effectively from 1100℃ down to 925℃.It was also found that a small amount of Lit addition has little effect on the phase structure and electromechanical properties of the system,but overweight seriously disturbs these characteristics because of the large lattice *** sintered NBT-BT-0.025FN incipient piezoceramics with 1.25 wt%Li_(2)CO_(3) addition at 925℃ provides a large strain of 0.33% and a corresponding large signal piezoelectric coefficient d_(33)^(*) of 550 pm/V at 60 kV/cm,indicating this system is a very promising candidate for lead-free co-fired multilayer actuator application.

关键词： Lead-free piezoceramics (Na_(1/2)Bi_(1/2))TiO_(3) Low-temperature sintering Electric-field-induced strain

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Progress and perspective of high strain NBT-based lead-free piezoceramics and multilayer actuators

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Journal of Materiomics 2021年第3期7卷 508-544页

作者： pengyuan fan Kai Liu Weigang Ma Hua Tan Qi Zhang Ling Zhang Changrong Zhou David Salamon Shan-Tao Zhang Yangjun Zhang Bo Nan Haibo Zhang School of Materials Science and Engineering State Key Laboratory of Material Processing and Die&Mould TechnologyHuazhong University of Science and TechnologyWuhan430074PR China School of Materials Science and Engineering University of New South WalesSydney2052Australia School of Mechanical and Electrical Engineering Shihezi UniversityShiheziChina College of Materials Science and Engineering Guilin University of Electronic TechnologyGuilin541004PR China Central European Institute of Technology(CEITEC)Brno University of Technology Czech Republic National Laboratory of Solid State Microstructures Department of Materials Science and EngineeringCollege of Engineering and Applied ScienceCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing210093China State Key Laboratory of Automotive Safety and Energy School of Vehicle and MobilityTsinghua UniversityBeijing100084PR China Guangdong HUST Industrial Technology Research Institute Dongguan523808PR China

In this review,the evolution of high strain Na_(0.5)Bi_(0.5)TiO_(3)-based lead-free piezoceramics and their multilayer actuators has been ***,in terms of Na_(0.5)Bi_(0.5)TiO_(3)-based ceramic materials,the origin of high strain,the typical chemical modification methods of obtaining large strain and extrinsic factors affecting the large strain are *** it briefly summarizes the problems existing in Na_(0.5)Bi_(0.5)TiO_(3)-based ceramics for multilayer actuator *** to optimize strain performance by means of microstructure control and phase structure design are also ***,in terms of multilayer actuator,we describe its characteristics,applications and preparation process systematically,as well as the recent development of Na_(0.5)Bi_(0.5)TiO_(3)-based multilayer *** last,perspectives on directions of following work and promising fields for the applications of the materials and their devices are presented.

关键词： Lead-free piezoceramics Bismuth sodium titanate Electric-field-induced strain Multilayer actuators

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Numerical Simulation On Hydraulic Charcteristics Of High Permeability River Closure MaTerials

Numerical Simulation On Hydraulic Charcteristics Of High Per...

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中国水利学会2016学术年会

作者： Li Dengsong Yang Qing Dai Guangqing Du Zhenyu fan pengyuan State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan University College of Water Resource & Hydropower Sichuan University Powerchina Chengdu Engineering Corporation Limited

The large quality of natural stone is more difficult to obtain in river closure project,and is replaced by concrete tetrahedrons and other artificial prefabricated *** method was proposed that permeability of artificial prefabricated materials was suitably reinforced to allow some seepage from closure dike,and then reduced the difficulty of river *** on this principle,a new permeable river closure material form is opening in the tetrahedral *** flow characteristic was studied by numerical simulation,and the results showed that size of opening would have a great impact on drag coefficient of permeable structure in *** reducing influence and intensity of vortex appeared in the tail *** the stability of permeable and non-permeable structure in water is consistent,flow characteristics is better than non-permeable tetrahedron.

关键词： High permeability River closure materials Tetrahedral structure Hydraulic characteristic Numerical simulation

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5S管理在植物油罐区输油管理中的应用

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粮食科技与经济 2018年第11期43卷 69-71页

作者：樊鹏远中储粮油脂(新郑)有限公司河南新郑451150

本文基于5S管理理念,结合物流储运输油的特点,从5S内容和目标出发,细化实施要点并持续改善,保证了输油管理水平的持续提升。通过5S管理的实施,有效地解决了存在的一些问题,提高了工作效率,达到预防为主、加强作业安全的目的。

关键词： 5S管理植物油输油管理

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流体横掠圆柱体传热特性数值模拟的流态模型选择

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上海电力学院学报 2018年第2期34卷 111-114页

作者：樊鹏远李永光上海电力学院能源与机械工程学院上海200090

采用层流模型、标准k-ε紊流模型、RNG k-ε紊流模型,对亚临界雷诺数条件下(Re=300~300 000)的二维圆柱扰流进行了数值模拟与仿真,得到了圆柱壁面平均努塞尔数随雷诺数变化的规律。并得出结论:当Re≤3 900时,采用层流模型较合适;当3 900... 详细信息

采用层流模型、标准k-ε紊流模型、RNG k-ε紊流模型,对亚临界雷诺数条件下(Re=300~300 000)的二维圆柱扰流进行了数值模拟与仿真,得到了圆柱壁面平均努塞尔数随雷诺数变化的规律。并得出结论:当Re≤3 900时,采用层流模型较合适;当3 900≤Re≤22 000范围内时,采用标准k-ε紊流模型较合适;当22 000≤Re≤300 000时,采用RNG k-ε紊流模型较合适。

关键词：流体亚临界雷诺数圆柱扰流流态模型

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ePUF: A Lightweight Double Identity Verification in IoT

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Tsinghua Science and Technology 2020年第5期25卷 625-635页

作者： Bo Zhao pengyuan Zhao Peiru fan the School of Cyber Science and Engineering Wuhan UniversityWuhan 430072China the School of Cyber Security and Computer Hebei UniversityBaoding 071002China

Remote authentication is a safe and verifiable *** the Internet of Things (loT),remote hosts need to verify the legitimacy of identity of terminal ***,embedded devices can hardly afford sufficient resources for the necessary trusted hardware *** authentication with no hardware guarantee is generally vulnerable to various network *** this paper,we propose a lightweight remote verification *** protocol utilizes the unique response returned by Physical Unclonable Function (PUF) as legitimate identity basis of the terminal devices and uses quadratic residues to encrypt the PUF authentication process to perform a double identity verification *** scheme is secure against middleman attacks on the attestation response by preventing conspiracy attacks from forgery authentication.

关键词： Internet of Things(IoT) Identity-Based Encryption(IBE) Physically Unclonable Functions(PUFs)

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开缝宽度对H型椭圆翅片管束换热及流动的影响

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上海电力学院学报 2018年第2期34卷 106-110页

作者：凌冬冬李永光马昕霞樊鹏远上海电力学院能源与机械工程学院上海200090

以不同开缝宽度的H型翅片椭圆管束为研究对象,利用FLUENT软件对顺排H型翅片椭圆管束的传热特性和阻力特性进行了数值研究。研究表明,在速度小于8 m/s时,不开缝的翅片换热效果最好,但在速度较大时换热最差;开缝宽度为5 mm的翅片管束因为... 详细信息

以不同开缝宽度的H型翅片椭圆管束为研究对象,利用FLUENT软件对顺排H型翅片椭圆管束的传热特性和阻力特性进行了数值研究。研究表明,在速度小于8 m/s时,不开缝的翅片换热效果最好,但在速度较大时换热最差;开缝宽度为5 mm的翅片管束因为"气塞",换热较差,动量损失率较大,实际生产应用中应尽量避免;开缝宽度为15 mm的翅片管束换热较好,动量损失率也较低。

关键词：强化传热来流速度开缝宽度

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SIV:A Structural Integrity Verification Approach of Cloud Components with Enhanced Privacy

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Tsinghua Science and Technology 2019年第5期24卷 557-574页

作者： Bo Zhao Peiru fan pengyuan Zhao Mingtao Ni Jinhui Liu School of Cyber Scienee and Engineering. Wuhan University Wuhan 430072 China. School of Computer Science Shaanxi Normal University Xi'an 710062 China

Private data leakage is a threat to current integrity verification schemes of cloud components. To address this issue, this work proposes a privacy-enhancing Structural Integrity Verification (SIV) approach. It is made up of three processes: proof organization, proof transformation, and integrity judgement. By introducing a Merkle tree technique, the integrity of a constituent part of a cloud component on a node is represented by a root value. The value is then masked to cipher texts in proof transformation. With the masked proofs, a structural feature is extracted and validated in an integrity judgement by a third-party verification provider. The integrity of the cloud component is visually displayed in the output result matrix. If there are abnormities, the corrupted constituent parts can be located. Integrity is verified through the encrypted masked proofs. All raw proofs containing sensitive information stay on their original nodes, thus minimizing the attack surface of the proof data, and eliminating the risk of leaking private data at the source. Although some computations are added, the experimental results show that the time overhead is within acceptable bounds.

关键词： integrity verification cloud components structural feature privacy

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A Survey: Typical Security Issues of Software-Defined Networking

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China Communications 2019年第7期16卷 13-31页

作者： Yifan Liu Bo Zhao pengyuan Zhao Peiru fan Hui Liu Key Laboratory of Aerospace Information Security and Trusted Computing Ministry of Education School of Cyber Science and Engineering Wuhan University Wuhan 430072 China School of Cyber Security and Computer Hebei University Baoding 071002 China

Software-Defined Networking (SDN) has been a hot topic for future network development, which implements the different layers of control plane and data plane respectively. Despite providing high openness and programmability, the “three-layer two-interface” architecture of SDN changes the traditional network and increases the network attack nodes, which results in new security issues. In this paper, we firstly introduced the background, architecture and working process of SDN. Secondly, we summarized and analyzed the typical security issues from north to south: application layer, northbound interface, control layer, southbound interface and data layer. Another contribution is to review and analyze the existing solutions and latest research progress of each layer, mainly including: authorized authentication module, application isolation, DoS/DDoS defense, multi-controller deployment and flow rule consistency detection. Finally, a conclusion about the future works of SDN security and an idealized global security architecture is proposed.

关键词： software-defined networking network security global security security threat

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