检索结果-南通市图书馆

High Voltage 2024年第2期9卷 391-402页

作者： Junwen He Bangfa Peng Guanglin Yu Ronggang Wang Nan Jiang Jie Li Yan Wu School of Electrical Engineering Dalian University of TechnologyDalianChina Canmax technologies Co. Ltd.SuzhouChina

A dual-frequency(DF)dielectric barrier discharge,excited by the superposition of a 50 Hz low frequency(LF)and a 5000 Hz intermediate frequency(IF),is proposed to enhance *** effect of the LF voltage component on the breakdown behaviour of the DF discharge during different periods has been studied both experimentally and *** number of high-current pulses rises as the LF voltage *** statistical analysis shows that the number of the current pulse amplitude above 80 mA in the DF discharge reaches nearly 6 times that in the IF ***,the total discharge energy in the DF discharge is significantly higher than that in the IF *** simulation re-produces the temporal variation of the breakdown behaviours in the DF *** simulated results reveal that the maximal electric field strength of the breakdown process is greater in the DF discharge compared to the IF discharge during a half-period of ***,the comparison between the IF and DF discharges exhibits that the LF voltage regulates the accumulation of residual charged species on the dielectric surface after the breakdown by modulating the residual voltage between the air gap.

关键词： dielectric excitation excited

Scenarios analysis and performance assessment of blockchain integrated in 6G scenarios

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2024年第7期67卷 5-26页

作者： Bo LI Guanjie CHENG Honghao GAO Xueqiang YAN Shuiguang DENG College of Computer Science and Technology Zhejiang University College of Computer Science and Technology Shanghai University 2012 Lab Huawei Technologies Co. Ltd.

Emerging applications such as smart city infrastructures and virtual reality landscapes are setting rigorous benchmarks for 6G mobile networks, requiring elevated levels of confidentiality, integrity, nonrepudiation, authentication, and stringent access controls. Blockchain technology is heralded as a transformative enabler for meeting 6G standards, owing to its intrinsic attributes. However, a gap exists in the holistic investigation of blockchain's applicability in 6G realms, particularly addressing the “whether”, “when”, and“how” of its deployment. Present research trails in developing robust methodologies to gauge blockchain's efficacy within 6G use cases. Addressing this, our study introduces a novel confluence of blockchain with 6G networks, where data resides in distributed Hash tables(DHTs) while their hashes are secured in distributed ledger technology(DLT), harnessing blockchain's core strengths-immutability, traceability, and fortified security. We delineate seven specific 6G use cases poised for enhancement through blockchain integration,and scrutinize the rationale, nature, and timing of this convergence. Furthermore, we devise a comprehensive methodology for assessing blockchain's performance metrics and scalability in 6G environments. Our extensive experimental analyses evaluate the synergistic performance of this integration, revealing that the Quorum blockchain satisfactorily supports 80% of 6G scenarios. The findings suggest that, with appropriate configurations, consortium blockchains are well-equipped to fulfill the demanding performance and scalability requisites of 6G networks.

关键词： blockchain distributed ledger technology (DLT) 6G performance assessment 6G scenarios analysis transaction arrival rate

On the electric behaviour of conductive grease inside the contact zone

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Friction 2024年第4期12卷 683-697页

作者： Yuxin ZHOU Jinjie LIU Xinming LI He CHONG Bo HAN Qinghua BAI SKF(Shanghai)Automotive technologies Co. Ltd.Shanghai 201814China School of Mechanical and Automotive Engineering Qingdao University of TechnologyQingdao 266250China

Conductive grease has been considered as a potential solution in addressing electric erosion issue inside motor *** the conductive grease performance,especially the electric and tribological behaviour is crucial for its *** paper combines bulk grease characterization and contact film study considering both electrical and tribological loading *** results show that the electric performance for the selected conductive grease sample is electric field dependent,including both frequency and voltage *** film impedance inside the contact area is closely related to the external electric field,running condition,and lubrication *** following film impedance calculation tells that not only bulk grease electric parameters,but the contact parameter,lubricant film contour and lubrication condition should be considered when performing the overall bearing electrical modelling.

关键词： Electric erosion lubricant conductivity grease film impedance

Removal of kathon by UV-C activated hydrogen peroxide:Kinetics,mechanisms,and enhanced biodegradability assessment

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2024年第1期65卷 178-187页

作者： Jinzhi Cui Guiqiao Wang Xing Rong Wensu Gao Yaxin Lu Yawen Luo Lichao Zhang Zhongfa Cheng Canzhu Gao School of Environmental Science and Engineering Shandong UniversityQingdao 266237China Shandong Taihe technologies Co. Ltd.Zaozhuang 250031China

Kathon(CMI-MI),a mixture of 5-chloro-2-methyl-4-isothiazolin-3-one(CMI)and 2-methyl-4-isothiazolin-3-one(MI),was extensively used in industry as a nonoxidizing biocide or ***,it would show adverse effects on aquatic life when it is discharged into surface *** this study,the removal performance,parameter influence,degradation products and enhancement of subsequent biodegradation of CMI-MI in UV/H_(2)O_(2)system were systematically *** degradation rate of CMI-MI could reach 90%under UV irradiation for 20 min when the dosage of H_(2)O_(2)was 0.3 mmol·L^(–1).The DOC(dissolved organic carbon)mineralization rate of CMI-MI could reach 35%under certain conditions([H_(2)O_(2)]=0.3 mmol·L^(–1),UV irradiation for 40 min).kobs was inversely proportional to the concentration of CMI-MI and proportional to the concentration of H_(2)O_(2).The degradation rate of CMIMI was almost unchanged in the pH range from 4 to *** the presence of CO_(3)^(2-)inhibited the removal rate of CMI-MI,SO_(4)^(2-),Cl^(-),NO_(3)^(-),and NH_(4)^(+) did not interfere with the degradation of CMI-MI in the *** was found that UV/H_(2)O_(2)system had lower energy consumption and more economic advantage compared with UV/PS system by comparing the EEO(electric energy per order)values under the same *** main organic products were identified,namely HCOOH and CH_(3)NH_(2).There’s also the formation of Cl^(-)and SO_(4)^(2-).After UV and UV/H_(2)O_(2)photolysis,the biochemical properties of CMI-MI solution were obviously improved,especially the UV/H_(2)O_(2)treatment effect was better,indicating that UV/H_(2)O_(2)technology is expected to combine with biotechnology to remove CMI-MI effectively and environmentally friendly from wastewater.

关键词： Kathon UV/H_(2)O_(2) Biological degradation Circulating cooling water

维普期刊数据库

A novel dual-core fiber-optic gyroscope with independent rotation rate measurements in different cores of a dual-core optical fiber

在线全文

学校读者我要写书评

暂无评论

Optoelectronics Letters 2024年第11期20卷 671-675页

作者： Emil A.Milikov Viacheslav V.Zemlyakov Pavel S.Anisimov GAO Jiexing 2012 Labs Central Research Institute Huawei Technologies Co. Ltd.

We introduce an all-fiber stationary phase shifter for a fiber-optic gyroscope(FOG) which simultaneously provides phase shifts of opposite signs in different cores of the dual-core optical fiber. We propose a new dual-core fiber-optic gyroscope(DCFOG) in which different cores of the dual-core optical fiber provide independent rotation rate measurements.

关键词： A

A cognitive spectrum allocation scheme for data transmission in smart distribution grids

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

High-Confidence Computing 2024年第3期4卷 32-40页

作者： Zhongguo Zhou You Li Ziming Zhu Qinghe Gao Sisi Xiao Tao Yan Yan Huo AoStar Information technologies CO. LTD.Chengdu 610094China School of Electronics and Information EngineeringBeijing Jiaotong UniversityBeijing 100044China

As the communication needs in the smart distribution grid continue to rise,using existing resources to meet this growing demand poses a significant *** paper researches on spectrum allocation strategies utilizing cognitive radio(CR)*** consider a model containing strong time-sensitive and regular communication service requirements such as distribution terminal communication services,which can be seen as a user with primary data(PD)and weak time-sensitive services such as power quality monitoring,which can be seen as a user with secondary data(SD).To fit the diversity of services in smart distribution grids(SDGs),we formulate an optimization problem with two indicators,including the sum of SD transmission rates and the maximum latency of ***,we analyze the two convex sub-problems and utilize convex optimization methods to obtain the optimal power and frequency bandwidth allocation for the users with *** simulation results indicate that,when the available transmission power of SD is low,Maximization of Transmission Sum Rate(MTSR)achieves lower maximum transmit ***,when the available transmission power is high,the performance of Minimization of the Maximum Latency(MML)is better,compared with MTSR.

关键词： Cognitive radio technologies Smart distribution grids Spectrum allocation Convex optimization

Robust polarimetric dehazing algorithm based on low-rank approximation and multiple virtual-exposure fusion

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonics Research 2024年第8期12卷 1640-1653页

作者： YIFU ZHOU HANYUE WEI JIAN LIANG FEIYA MA RUI YANG LIYONG REN XUELONG LI School of Physics and Information Technology Shaanxi Normal UniversityXi’an 710119China Xi’an Key Laboratory of Optical Information Manipulation and Augmentation(OMA) Xi’an 710119China Robust(Xixian New Area)Opto-Electro technologies Co. Ltd.Xi’an 712000China Institute of Artificial Intelligence(TeleAI) China Telecom Corp Ltd.Beijing 100033China

Polarimetric dehazing is an effective way to enhance the quality of images captured in foggy ***,images of essential polarization parameters are vulnerable to noise,and the brightness of dehazed images is usually unstable due to different environmental *** two weaknesses reveal that current polarimetric dehazing algorithms are not robust enough to deal with different *** paper proposes a novel,to our knowledge,and robust polarimetric dehazing algorithm to enhance the quality of hazy images,where a low-rank approximation method is used to obtain low-noise polarization parameter ***,in order to improve the brightness stability of the dehazed image and thus keep the image have more details within the standard dynamic range,this study proposes a multiple virtual-exposure fusion(MVEF)scheme to process the dehazed image(usually having a high dynamic range)obtained through polarimetric *** experiments show that the proposed dehazing algorithm is robust and effective,which can significantly improve overall quality of hazy images captured under different environments.

关键词： algorithm approximation image

维普期刊数据库

Improving strength-ductility synchronously of Electron beam welded Ti600/Ti2AlNb joint through isothermal forging

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2024年第3期34卷 532-539页

作者： Yongqiang Zhang Xiangyi Xue Guoming Zheng Jingli Zhang Huiming Li Shewei Xin State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an Qin Ti Intelligent Manufacturing technologies Co.ltd. Northwest Institute for Nonferrous Metal Research Xi'an University of Science and Technology Avic Xi'an Aircraft Industry Group Company ltd.

Different alloys can be flexibly combined to meet the performance needs of different parts of the compressor disc by welding process. However, achieving a good combination of dissimilar alloys with different mechanical properties has always been a research difficulty. In this work, a Ti600/Ti2AlNb joint was fabricated through electron beam welding and an isothermal forging was used to optimized its microstructure and mechanical performance. The isothermal forging process increases the ultimate tensile strength（UST） and yield strength（YS）of the Ti600/Ti2AlNb joint by ～18 %, while ～2.5 times the ductility. It is indicated that before forging, the Ti600/Ti2AlNb joint exhibits a much lower strength than that of Ti600 matrix, whereas the opposite is true after isothermal forging. The isothermal forging broken the coarse columnar grains of Ti600/Ti2AlNb joint and render to an equiaxed B2 structure in which the acicular α2and O phase are precipitated, resulting a synchronous enhancement of strength and ductility. This work may pave an effective routine for improving the comprehensive mechanical properties of dissimilar metal welding joint.

关键词： Electron beam welding Isothermal forging Mechanical performance Ti600/Ti2AlNb joint

Effect of titanium on the sticking of pellets based on hydrogen metallurgy shaft furnace:Behavior analysis and mechanism evolution

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2024年第2期31卷 282-291页

作者： Jinge Feng Jue Tang Zichuan Zhao Mansheng Chu Aijun Zheng Xiaobing Li Xiao’ai Wang School of Metallurgy Northeastern UniversityShenyang 110819China Institute for Frontier technologies of Low-carbon Steelmaking Northeastern UniversityShenyang 110819China Liaoning Low-carbon Steelmaking Technology Engineering Research Center Northeastern UniversityShenyang 110819China Engineering Research Center of Frontier technologies for Low-carbon Steelmaking(Ministry of Education Shenyang 110819China Zhang Xuan Technology of HBIS Group Co. Ltd.Shijiazhuang 050000China Xuanhua Iron and Steel Group Co. Ltd.Shijiazhuang 050000China Iron and Steel Research Institute of HBIS Group Co. Ltd.Shijiazhuang 050000China

Direct reduction based on hydrogen metallurgical gas-based shaft furnace is a promising technology for the efficient and low-carbon smelting of vanadium-titanium ***,in this process,the sticking of pellets occurs due to the aggregation of metal-lic iron between the contact surfaces of adjacent pellets and has a serious negative effect on the continuous *** paper presents a detailed experimental study of the effect of TiO2 on the sticking behavior of pellets during direct reduction under different *** showed that the sticking index(SI)decreased linearly with the increasing TiO2 *** phenomenon can be attributed to the increase in unreduced FeTiO3 during reduction,leading to a decrease in the number and strength of metallic iron interconnections at the sticking *** the TiO2 addition amount was raised from 0 to 15wt%at 1100°C,the SI also increased from 0.71%to 59.91%.The connection of the slag phase could be attributed to the sticking at a low reduction temperature,corresponding to the low sticking ***,the interconnection of metallic iron became the dominant factor,and the SI increased sharply with the increase in re-duction ***2 had a greater effect on SI at a high reduction temperature than at a low reduction temperature.

关键词： titanium sticking index hydrogen metallurgy direct reduction pellets

维普期刊数据库

Opportunities and challenges of high-entropy materials in lithium-ion batteries

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第10期43卷 4884-4902页

作者： Tong-Yue Xu Huai-Wei Feng Wei Liu Yan Wang Hong-He Zheng College of Energy&Jiangsu Key Laboratory of Advanced Negative Carbon technologies& Collaborative Innovation Center of Suzhou Nano Science and TechnologySoochow University NARI Technology Co. Ltd.

Lithium-ion batteries(LIBs) currently occupy an important position in the energy storage market, and the development of advanced LIBs with higher energy density and power density, better cycle life and safety is a hot topic for both academia and industry. In recent years, high-entropy materials(HEMs) with complex stoichiometric ratios have attracted great attention in the field of LIBs due to their various promising functional properties. The adjustability and synergistic effects of multiple elements in HEMs make them possible to break through the bottleneck of traditional electrode materials and electrolytes, providing new opportunities for the development of high-performance LIBs. This article provides an overview of the opportunities and challenges of HEMs in LIBs, including cathodes, anodes and electrolytes. The progress of HEMs in LIBs is first summarized and analyzed, then the potential advantages and limitations of HEMs used in LIBs are concluded, finally some envisioned solutions are proposed to develop more advanced LIBs through HEMs.

关键词： Lithium-ion batteries