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Review on helium behaviors in nanochannel tungsten film

Tungsten 2021年第4期3卷 369-381页

作者： Wen-Jing Qin Wei Guo Tao Cheng Jun Tang Chang-Zhong Jiang Feng Ren Key Laboratory for Matter Microstructure and Function of Hunan Province Synergetic Innovation Center for Quantum Effects and ApplicationSchool of Physics and ElectronicsHunan Normal UniversityChangsha 410081China Center for Ion Beam Application and Center for Electron Microscopy School of Physics and TechnologyWuhan UniversityWuhan 430072China

Tungsten(W)as plasma facing material(PFM)needs to face an unprecedented harsh environment in the fusion reactor,which puts forward high requirements for its radiation *** the many challenges,the rapid accumulation of helium(He)atoms to form numerous bubbles or even“fuzzy”nanostructure leads to swelling and embrittlement of W matrix and seriously shorten its service life,which is one of the most serious problems faced by PFM-W at *** this review,we summarize the recent works on the nanochannel W films with high surface-to-volume ratio deposited by magnetron sputter-ing,and the behaviors of He in the nanochannel W films at different fusion-related irradiation *** and simulation results showed that the nanochannel W films have better radiation tolerance performance in managing He behaviors than that of commercial bulk W.

关键词： Tungsten Nanochannel structure He behaviors Radiation tolerance Simulation

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High Rate and Long Lifespan Sodium‑Organic Batteries Using Pseudocapacitive Porphyrin Complexes‑Based Cathode

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Nano-Micro Letters 2021年第5期13卷 1-16页

作者： Xi Chen Xin Feng Bo Ren Liangzhu Jiang Hongbo Shu Xiukang Yang Zhi Chen Xiujuan Sun Enhui Liu Ping Gao Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education Key Laboratory for Green Organic Synthesis and Application of Hunan ProvinceCollege of ChemistryXiangtan UniversityXiangtan 411105People’s Republic of China International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale OptoelectronicsCollege of Chemistry and Enviromental EngineeringShenzhen UniversityShenzhen 518060People’s Republic of China

Sodium-organic batteries utilizing natural abundance of sodium element and renewable active materials gain great attentions for grid-scale ***,the development is still limited by lack of suitable organic cathode materials with high electronic conductivity that can be operated stably in liquid ***,we present 5,15-bis(ethynyl)-10,20-diphenylporphyrin(DEPP)and[5,15-bis(ethynyl)-10,20-diphenylporphinato]copper(II)(CuDEPP)as new cathodes for extremely stable sodium-organic *** copper(II)ion partially contributes the charge storage and significantly stabilizes the structure of porphyrin complex for electrochemical energy *** situ electrochemical stabilization of organic cathode with a lower charging current density was identified which enables both improved high energy density and power *** excellent longterm cycling stability up to 600 cycles and an extremely high power density of 28 kW kg−1 were achieved for porphyrin-based *** observation would open new pathway for developing highly stable sodium-organic cathode for electrochemical energy storage.

关键词： Organic cathode Sodium-organic batteries Porphyrin complex Rechargeable batteries Pseudocapacitive effect

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Boosting triplet self-trapped exciton emission in Te(IV)-doped Cs_(2)SnCl_(6) perovskite variants

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Nano Research 2021年第5期14卷 1551-1558页

作者： Ruosheng Zeng Kun Bai Qilin Wei Tong Chang Jun Yan Bao Ke Jialuo Huang Liushun Wang Weichang Zhou Sheng Cao Jialong Zhao Bingsuo Zou School of Physical Science and Technology MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and MaterialsGuangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsGuangxi UniversityNanning530004China School of Materials Science and Engineering Guilin University of Electronic TechnologyGuilin541004China School of Physics and Electronics Key Laboratory of Low-dimensional Quantum Structures and Quantum Control of Ministry of EducationKey Laboratory for Matter Microstructure and Function of Hunan ProvinceSynergetic Innovation Center for Quantum Effects and ApplicationHunan Normal UniversityChangsha410081China

Perovskite variants have attracted wide interest because of the lead-free nature and strong self-trapped exciton (STE) emission. Divalent Sn(II) in CsSnX3 perovskites is easily oxidized to tetravalent Sn(IV), and the resulted Cs2SnCl6 vacancy-ordered perovskite variant exhibits poor photoluminescence property although it has a direct band gap. Controllable doping is an effective strategy to regulate the optical properties of Cs2SnX6. Herein, combining the first principles calculation and spectral analysis, we attempted to understand the luminescence mechanism of Te4+-doped Cs2SnCl6 lead-free perovskite variants. The chemical potential and defect formation energy are calculated to confirm theoretically the feasible substitutability of tetravalent Te4+ ions in Cs2SnCl6 lattices for the Sn-site. Through analysis of the absorption, emission/excitation, and time-resolved photoluminescence (PL) spectroscopy, the intense green-yellow emission in Te4+:Cs2SnCl6 was considered to originate from the triplet Te(IV) ion 3P1→1S0 STE recombination. Temperature-dependent PL spectra demonstrated the strong electron-phonon coupling that inducing an evident lattice distortion to produce STEs. We further calculated the electronic band structure and molecular orbital levels to reveal the underlying photophysical process. These results will shed light on the doping modulated luminescence properties in stable lead-free Cs2MX6 vacancy-ordered perovskite variants and be helpful to understand the optical properties and physical processes of doped perovskite variants.

关键词： Cs_(2)SnCl_(6)perovskite variants equivalent ion doping self-trapped exciton(STE)emission electron-phonon coupling first principles calculation

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Three-Phase Unbalanced Treatment Scheme Based on High-Speed Power Line Carrier 2

Three-Phase Unbalanced Treatment Scheme Based on High-Speed ...

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2019 2nd International Symposium on Power Electronics and Control Engineering, ISPECE 2019

作者： Huang, Rui Guo, Guang Chen, Jianhua Liu, Mouhai Liu, Zhiguo Yu, Minqi State Grid Hunan Electric Power Company Changsha Hunan410000 China Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology Changsha Hunan410000 China

Most of the low-voltage distribution networks are three-phase four wire systems. Because of the quantity and dispersion of single-phase power users, the three-phase load unbalanced problem exists in a large number of low-voltage stations. With the continuous increase of power consumption level of the majority of power customers, the three-phase load unbalanced has become increasingly prominent in low-voltage station area. In this paper, the mechanism of three-phase unbalance generation and the defects of traditional treatment methods are introduced. On this basis, a three-phase unbalanced treatment scheme for low-pressure station area is proposed. The scheme can test out three-phase imbalance of low-voltage substation area quickly and accurately, and adjust the load phase sequence in real time without power failure through the intelligent commutation switch system, so that three-phase load in the station area lies a comparatively balanced condition. The scheme can cut down the loss of transformer and line caused through unbalanced three-phase load e in nicely. And it can restrain single-phase overcurrent, and solve the problem of terminal low voltage treatment. © Published under licence by IOP Publishing Ltd.

关键词： Voltage distribution measurement

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Effects of Mg content on pore structure and electrochemical corrosion behaviors of porous Al-Mg alloys

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Journal of Central South University 2016年第10期23卷 2483-2491页

作者： He, Wen-yuan Xiao, Yi-feng Wu, Liang Xu, Yan-fei Qian, Jin-wen He, Yue-hui Zheng, Xue-jun School of Mechanical Engineering Xiangtan University Xiangtan411105 China Key Laboratory of Welding Robot and Application Technology of Hunan Province Xiangtan University Xiangtan411105 China Engineering Research Center of Complex Trajectory Processing Technology and Equipment of Ministry of Education Xiangtan University Xiangtan411105 China State Key Laboratory of Powder Metallurgy Central South University Changsha410083 China

Porous Al-Mg alloys with different nominal compositions were successfully fabricated via elemental powder reactive synthesis, and the phase composition, pore structure, and corrosion resistance were characterized with X-ray diffractometer, scanning electron microscope and electrochemical analyzer. The volume expansion ratio, open porosity and corrosion resistance in 3.5% (mass fraction) NaCl aqueous solution of the alloys increase at first and then decrease with the increase of Mg content. The maxima of volume expansion ratio and open porosity are 18.3% and 28.1% for the porous Al-56%Mg (mass fraction) alloy, while there is the best corrosion resistance for the porous Al-37.5% Mg (mass fraction) alloy. The pore formation mechanism can be explained by Kirkendall effect, and the corrosion resistance can be mainly affected by the phase composition for the porous Al-Mg alloys. They would be of the potential application for filtration in the chloride environment. © 2016, Central South University Press and Springer-Verlag Berlin Heidelberg.

关键词： Aluminum alloys

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Reliability assessment on interfacial failure of thermal barrier coatings

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Acta Mechanica Sinica 2016年第5期32卷 915-924页

作者： Jin-Wei Guo Li Yang Yi-Chun Zhou Li-Min He Wang Zhu Can-Ying Cai Chun-Sheng Lu Key Laboratory of Key Film Materials & Application for Equipment (Hunan Province) School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105China Key Laboratory of Low Dimensional Materials & Application Technology (Ministry of Education) School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105China Beijing Institute of Aeronautical Materials Beijing 100095China Department of Mechanical Engineering Curtin UniversityPerthWestern Australia 6845Australia

Thermal barrier coatings（TBCs） usually exhibit an uncertain lifetime owing to their scattering mechanical properties and severe service conditions. To consider these uncertainties, a reliability assessment method is proposed based on failure probability analysis. First, a limit state equation is established to demarcate the boundary between failure and safe regions, and then the failure probability is calculated by the integration of a probability density function in the failure area according to the first- or second-order *** is shown that the parameters related to interfacial failure follow a Weibull distribution in two types of TBC. The interfacial failure of TBCs is significantly affected by the thermal mismatch of material properties and the temperature drop in service.

关键词： Reliability assessment Thermal barrier coatings Interfacial failure

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Constitutive Model and Plate Forging Ability of 5052 Aluminum Alloy Under Different Temperatures 13th

Constitutive Model and Plate Forging Ability of 5052 Aluminu...

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13th International Conference on the technology of Plasticity, ICTP 2021

作者： Li, Yantao Dong, Wenzheng Lin, Qiquan Wang, Zhigang Key Laboratory of Robot and Application Technology of Hunan Province Xiangtan University Xiangtan China State Key Laboratory of Materials Processing and Die and Mould Technology Huazhong University of Science and Technology Wuhan China Department of Mechanical and System Engineering Gifu University Gifu Japan

ISBN: (纸本)9783030753801

The hot tensile deformation behavior of 5052 aluminum alloy is investigated by uniaxial tensile tests with the temperature range of 523–723 K and strain rate range of 0.001–0.1 s−1. The constitutive equation is established based on the Arrhenius-type equation and Zener–Hollomon parameters, which are applied to numerical simulation for solid boss forming by plate forging process. As a result, the flow stresses obtained from the constitutive equation are consistent with the experiments, and the proposed constitutive equation is succeeded to predict the deformation behavior in the plate forging process. The best forming temperature for boss solid forming is 673 K based on the boss forming ability analysis. © 2021, The Minerals, Metals & Materials Society.

关键词： Constitutive equations

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Prediction of chilling damage risk in maize growth period based on probabilistic neural network approach

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International Journal of Agricultural and Biological Engineering 2021年第2期14卷 120-125页

作者： Chunqiao Mi Changhua Zhao Qingyou Deng Xiaowu Deng School of Computer Science and Engineering Huaihua UniversityHuaihua 418000HunanChina Key Laboratory of Intelligent Control Technology for Wuling-Mountain Ecological Agriculture Huaihua 418000HunanChina Key Laboratory of Wuling-Mountain Health Big Data Intelligent Processing and Application in Hunan Province Universities Huaihua 418000HunanChina Human Resource Department Huaihua UniversityHuaihua 418000HunanChina

Low temperature chilling damage is one of the most serious disasters in maize production,which is a typical non-linear complex issue with numerous influencing factors and strong *** to predict it is not only a hot theoretical research topic,but also an urgent practical problem to be ***,most of the current researches are focusing on post-disaster static descriptive assessment rather than pre-disaster dynamic predictive analysis,resulting in the problems such as no indicative result and low *** this study,the satisfaction rate of environmental accumulated temperature for maize production was used to measure the chilling damage risk,and a model for maize chilling damage risk prediction based on probabilistic neural network was *** model was composed of input layer,pattern layer,summation layer and output *** obtained results showed that the prediction accuracy for the most serious risk level was as high as 0.91,and the rates of the Type I Error and Type II Error made by the model were 0.1 and 0.09,*** indicated that the model employed was promising with good *** results of this research are of both theoretical significance for providing a new reference method of pre-disaster prediction to study maize chilling disaster risk and practical significance for reducing maize production risk and ensuring yield safety.

关键词： maize chilling damage risk prediction probabilistic neural network

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Online Monitoring Method for Metering Errors in Charging Facilities Based on Energy Conservation and Double Metering Comparison 6

Online Monitoring Method for Metering Errors in Charging Fac...

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6th International Conference on Information Technologies and Electrical Engineering, ICITEE 2023

作者： Yang, Jing Wu, Cong Wang, Zhi Liu, Chao Liu, Mouhai State Grid Hunan Electric Power Corporation Limited Changsha China Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology Changsha China

ISBN: (纸本)9798400708299

The electric energy metering device of charging facilities is easily affected by factors such as power quality, abnormal fluctuations in fixed loss in the station area, and distortion signals, and it is difficult to ensure the accuracy of electric energy measurement of charging facilities. In order to ensure the fairness, impartiality, scientific accuracy of measuring charging facilities, and enhance the accuracy of measurement, a hardware and software-based method combining energy conservation and comparison of primary and secondary metering modules is proposed for online monitoring of charging pile errors. Firstly, the measurement errors of each charging pile are calculated based on energy conservation. Secondly, for suspected charging piles with excessive errors, a secondary judgment is conducted using the primary and secondary metering module approach to enhance the robustness of online error monitoring. This method has the advantages of simple structure, low cost, high monitoring efficiency, and accuracy. © 2023 ACM.

关键词： Piles

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Experimental research on glubam-concrete composite beams for bridges 3rd

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3rd International Conference on Modern Bamboo Structures, ICBS 2018

作者： Li, T.Y. Shan, B. Guo, Y.R. College of Civil Engineering Hunan University Changsha China Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province Changsha China

ISBN: (纸本)9781138351851

This paper describes the outcomes of short-term tests on glubam-concrete composite (BCC) beams for bridge. Two types of connection have been tested: screw connector (SC) and notch connection (NC). Different variables include numbers and types of connection. Four-point bending tests to failure were performed on four full-scale BCC beams with 8.0 m long. All BCC beams with different connections exhibited satisfactory mechanical performance under short-term loading conditions in this investigation. © 2020 Taylor & Francis Group, London.

关键词： Bending tests

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