检索结果-南通市图书馆

Study on friction performance of graph.ne-based semi-solid grease

在线全文

学校读者我要写书评

暂无评论

Ch.nese Ch.mical Letters 2014年第9期25卷 1305-1307页

作者： Zh.-Lin Ch.ng xi-xi qin College of Ch.mistry and Ch.mical Engineering Yangzhou University

Th. graph.ne-based semi-solid grease with.low friction coefficient was prepared by h.gh.y dispersed mixing meth.d. Th. friction testing result sh.wed th.t th. friction coefficient of th. graph.ne oxidebased semi-solid grease reduced from ca. 0.105 of graph.te-based one to ca. 0.075, approximately 30% decreasing. Furth.r, th. graph.ne-based semi-solid grease sh.ws th. more outstandingly lubricating property, and th. friction coefficient approximately drops to th. range of between 0.04 and 0.06. By comparing with.th. graph.te-based grease, th. friction coefficient decreases about 40%-60% and th. wear reduced over 50%.

关键词： Graph.ne Friction Wear Grease

An Improved h.∞ Filter Design for Nonlinear Systems Described by T-S Fuzzy Models with.Time-varying Delay

在线全文

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2015年第6期12卷 671-678页

作者： Tuo Zh.u xi-qin h. Sch.ol of Science Liaoning University of Science and Technology

Th.s paper addresses a robust h.filter design problem for nonlinear systems with.time-varying delay th.ough.TakagiSugeno(T-S) fuzzy model approach. Firstly, by introducing free-weigh.ing matrix meth.d combined with.a matrix decoupling approach.and adopting an improved integral inequality meth.d with.ut ignoring any integral term, less conservative results are ach.eved. Next,based on th. model, new delay-dependent sufficient conditions are derived, wh.ch.are less conservative th.n th. existing ones via solving th. linear matrix inequalities(LMIs). Lastly, simulations sh.w a significant improvement over th. previous results.

关键词： Takagi-Sugeno(T-S) fuzzy model h.filter nonlinear

Gear Pitting Measurement by Multi-Scale Splicing Attention U-Net

在线全文

学校读者我要写书评

暂无评论

Ch.nese Journal of Mech.nical Engineering 2023年第2期36卷 140-154页

作者： Yi qin Dejun xi Weiwei Ch.n Yi Wang State Key Laboratory of Mech.nical Transmission Chongqing UniversityChongqing 400044China College of Mech.nical Engineering Chongqing UniversityChongqing 400044China

Th. judgment of gear failure is based on th. pitting area ratio of *** gear pitting calculation meth.d mainly rely on manual visual *** meth.d is greatly affected by h.man factors,and is greatly affected by th. working experience,training degree and fatigue degree of th. detection personnel,so th. detection results may be *** non-contact computer vision measurement can carry out non-destructive testing and monitoring under th. working condition of th. mach.ne,and h.s h.gh.detection *** improve th. measurement accuracy of gear pitting,a novel multi-scale splicing attention U-Net(MSSA U-Net)is explored in th.s *** image splicing module is first proposed for concatenating th. output feature maps of multiple convolutional layers into a splicing feature map with.more semantic ***,an attention module is applied to select th. key features of th. splicing feature *** th.t MSSA U-Net adequately uses multi-scale semantic features,it h.s better segmentation performance on irregular small objects th.n U-Net and attention *** th. basis of th. designed visual detection platform and MSSA U-Net,a meth.dology for measuring th. area ratio of gear pitting is *** th.ee datasets,experimental results sh.w th.t MSSA U-Net is superior to existing typical image segmentation meth.ds and can accurately segment different levels of pitting due to its strong segmentation ***,th. proposed meth.dology can be effectively applied in measuring th. pitting area ratio and determining th. level of gear pitting.

关键词： Gear pitting Image segmentation Attention module Computer vision Quantitative detection

Quasi-Lipsch.tz equivalence of quasi Ah.fors-David regular sets

在线全文

学校读者我要写书评

暂无评论

Science Ch.na Math.matics 2011年第12期54卷 2573-2582页

作者： WANG qin xi LiFeng Sch.ol of Computer Science and Information Tech.ology Zhejiang Wanli University Ningbo 315100 China Institute of Math.matics Zhejiang Wanli University Ningbo 315100 China

Suppose compact sets E and F are quasi uniformly disconnected and quasi Ah.fors-David *** paper proves th.t E and F are quasi-Lipsch.tz equivalent if and only if th.y h.ve th. same h.usdorff dimension.

关键词： fractal quasi-Lipsch.tz equivalence Ah.fors-David regularity

Minimum-energy leader-following formation of distributed multiagent systems with.communication constraints

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2023年第6期34卷 1419-1431页

作者： qin Dongh.o WANG Le GAO Jiuan xi Jianxiang Rocket Force University of Engineering Xi’an 710025China

Th.s paper concerns minimum-energy leader-following formation design and analysis problems of distributed multiagent systems(DMASs)subjected to randomly switch.ng topologies and aperiodic communication *** critical feature of th.s paper is th.t th. energy consumption during th. formation control process is restricted by th. minimum-energy constraint in th. sense of th. linear matrix ***,th. leader-following formation control protocol is proposed based on th. relative state information of neigh.oring agents,wh.re th. total energy consumption is ***,minimum-energy leader-following formation design and analysis criteria are presented in th. form of th. linear matrix inequality,wh.ch.can be ch.cked by th. generalized eigenvalue ***,th. value of th. minimum-energy constraint is *** illustrative simulation is provided to sh.w th. effectiveness of th. main results.

关键词： multi-agent system leader-following formation communication pause minimum energy.

Monte Carlo simulation of sequential structure control of AN-MA-IA aqueous copolymerization by different operation modes

在线全文

学校读者我要写书评

暂无评论

Ch.nese Journal of Ch.mical Engineering 2022年第6期35卷 231-242页

作者： Tong qin Zh.nh.o xi Ling Zh.o Weikang Yuan State Key Laboratory of Ch.mical Engineering East China University of Science and TechnologyShanghai 200237China College of Ch.mistry and Ch.mical Engineering Xinjiang UniversityUrumqi 830046China

Th. regulation of polyacrylonitrile(PAN)copolymer composition and sequence structure is th. precondition for producing h.gh.quality carbon fiber h.gh.*** th.s work,th. sequential structure control of acrylonitrile(AN),meth.l acrylate(MA)and itaconic acid(IA)aqueous copolymerization was investigated by Monte Carlo(MC)*** parameters used in Monte Carlo were optimized via mach.ne learning(ML)and genetic algorith.s(GA)using th. experimental data from batch.*** results reveal th.t it is difficult to control th. aqueous copolymerization to obtain PAN copolymer with.uniform sequence structure by batch.polymerization with.one-time *** contrary,it is found th.t th. PAN copolymer with.uniform composition and sequence structure can be obtained by adjusting IA feeding quantity in each.reactor of a train of five ***,th. results obtained in th.s work can provide valuable information for th. understanding and optimization of AN copolymerization process to obtain h.gh.quality PAN copolymer precursor.

关键词： Polyacrylonitrile Monte Carlo simulation Mach.ne learning Genetic algorith.s Sequence structure Operation meth.d

To increase more th.n 10% in efficiency of perovskite solar cells by using nanoh.les SnO_(2)

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2021年第10期40卷 2778-2784页

作者： Sh.-Ren Sun xi-xi xie Guo-Gang qin Li-xin xiao State Key Laboratory for Mesoscopic Ph.sics and Department of Ph.sics Peking UniversityBeijing 100871China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Th. perovskite solar cells h.ve been intensively investigated th.se years due to th.ir premium electrical and optical properties as well as h.ge potential for *** order to furth.r increase th. power conversion efficiency(PCE) of th. th.n film perovskite solar cells, ligh. management sh.uld be taken into consideration. h.rein, we apply a lith.graph. meth.d to transfer randomly distributed polystyrene(PS) nanosph.res into th. electron transporting SnO_(2) layer, by means of wh.ch. a nanoh.les structure is formed. Finally, we get a nanostructured perovskite layer under low temperature(less th.n 150 ℃).Th. depth.of SnO_(2) nanoh.les is around 60 nm wh.n th. device is fabricated with.300-nm PS, and 150 nm in depth.wh.n 500-nm PS is used. Th. device gains PCE of 17.97%,wh.ch.is 12.3% h.gh.r th.n th.t with.planar electrontransporting SnO_(2) layer and 300-nm Ch.(3)Nh.(3)PbI_(3) *** findings provide an applicable meth.d to improve th. ligh. absorption, wh.ch.can not only make th. absorbing layer of lead-based perovskite solar cells th.nner to h.lp decrease th. content of lead, but also increase th. PCE of non-lead perovskite devices.

关键词： Ligh. trap Perovskite Solar cell Nanoh.le Nanosph.re lith.graph.

An USB-based time measurement system

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Tech.iques 2010年第6期21卷 366-369页

作者： qin xi Liu Sh.bin An Qi Ch.nese Acad Sci Key Lab Technol Particle Detect & Elect Hefei 230026 Peoples R China Univ Sci & Tech.ol Ch.na Dept Modern Phys Anhui Key Lab Phys Elect Hefei 230026 Peoples R China

In th.s paper,we report th. electronics of a timing measurement system of PTB(portable TDC board), wh.ch.is a h.ndy tool based on USB interface,customized for h.gh.precision time measurements with.ut any crates. Th. time digitization is based on th. h.gh.Performance TDC Ch.p(h.TDC).Th. real-time compensation for h.TDC outputs and th. USB master logic are implemented in an ALTERA's Cyclone *** arch.tecture design and logic design are described in *** of th. system sh.wed a time resolution of 13.3 ps.

关键词： USB接口时间测量测量系统 ALTERA公司 Cyclone h.TDC 体系结构设计逻辑设计

Spatial Polarization of Villages in Tourist Destinations: A Case Study from Yesanpo, Ch.na

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2015年第4期12卷 1038-1050页

作者： xi Jian-ch.o KONG qin-qin WANG xin-ge Institute of Geograph.cal Sciences and Natural Resources Research Chinese Academy of Sciences Key Laboratory of Land Surface Pattern and Simulation Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences University of Ch.nese Academy of Sciences

Spatial perspectives were applied to examine th. processes of growth.and development in rural settlements affected by *** on field surveys and GIS spatial analysis meth.ds, we studied th. spatial evolution of two villages(Jiaojiekou and Gougezh.ang) in th. Yesanpo tourist area over th. last 25 *** results revealed a polarization trend,with.Jiaojiekou becoming a ‘h.llowed' village and Gougezh.ang developing into a ‘new-type' tourist *** polarization indicates th. unsustainability of rural development in tourist destinations, wh.ch.is manifested by th. following features: only some villages benefit from th. development of tourism;th.re is simultaneously a sh.rtage of land in tourist villages and a wastage of land in traditional villages;and th. function of th. villages is ***, th. spillover of th. effects of tourism may provide an opportunity for th. development of traditional *** better utilize th.s opportunity,we propose th.t:(1) integrated rural tourism management sh.uld be developed to explore effective meth.ds of promoting tourism as part of a rural development strategy;(2) different land use policies are required for different villages; and(3) th. balance between government regulation and community participation sh.uld be emph.sized.

关键词： Spatial polarization Land use ch.nge Rural tourism Traditional villages Sustainable development