检索结果-南通市图书馆

Influence of Interpenetrating Polymer Networks (IPN) Microstructure on Underwater Acoustic Stealth Performance

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan university of {1.(Materials Science) 2010年第2期25卷 272-277页

作者：罗忠 college of Naval Architecture and {1. Naval University of Engineering

According to the configuration and absorption theory of polymer macromolecule materials, a kind of IPN with wider temperature range and higher damping property was designed and synthesized. By using the spectrum of dynamic mechanical thermal analysis （DMTA） and acoustic pulse tube device, the microstructure, phase separation degree, phase size and phase continuity of IPN with different components were analyzed. The experimental results show that the nano size grade of phase, the continuous and homogeneous IPN phase can provide higher absorption coefficient. The absorption coefficient of optimized sample I09 is 0.7 in 2 kHz, and the absorption peak is 0.9 in 4 kHz. Then the underwater acoustic properties of modified IPN filled with mica, micro-balloon and nano-SiO2 were discussed respectively to indicate that the inhomogeneous property of filler-modified IPN can improve the underwater acoustic stealth performance effectively, and the micro size grade of these filler-modified IPN can work well in low frequency acoustic stealth.

关键词： interpenetrating polymer networks (IPN) polyurethane damping absorption coefficient fillers

Effects of Annealing Temperature on the Electrical Conductivity and mechanical Property of Cu-Te Alloys

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan university of {1.(Materials Science) 2007年第1期22卷 88-90页

作者：朱达川 Metallic Material Department College of Material Science and Engineering Sichuan University

The effects of annealing temperatre on the electrical conducitivity and mechanical property of Cu-Te alloys were studied via an AG-1.TA electronic universal machine, an SB2230 digital electric bridge, SEM, EDS and XPS. The results show the electrical conductivity increases while the tensile strength fluctuates when the annealing temperature becomes higher because the recrystallization occurs during the annealing process, leading to the density of dislocation decreasing, grain size growing up, but the second phase precipitating sufficiently and simultaneously.

关键词： Cu-Te alloys annealing temperature recrystallization

Predicting the Risk of Arterial Stiffness in Coal Miners Based on Different Machine Learning Models

在线全文

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2024年第1期37卷 108-111页

作者： CHEN Qian Wei HUANG xue Zan DING Yu {1. Feng Ren WANG Jia ZOU Yuan Jie DU Yuan Zhen ZHANG Ya Jun HUI Zi Wen {1. Feng Lin MU Min The Project was supported by Open Research Grant of Joint National-Local engineering Research Centre for Safe and Precise Coal Mining Anhui University of Science and TechnologyHefei 232001AnhuiChina School of Public Health Anhui University of Science and TechnologyHefei 232001AnhuiChina Key Laboratory of Industrial Dust Prevention and Control Occupational Safety and HealthMinistry of EducationAnhui University of Science and TechnologyHefei 232001AnhuiChina Anhui Institute of Occupational Safety and Health Anhui University of Science and TechnologyHefei 232001AnhuiChina Joint Research Center of Occupational Medicine and Health Institute of Grand HealthHefei Comprehensive National Science CenterAnhui University of Science and TechnologyHefei 232001AnhuiChina Department of Occupational&Environmental Health School of Public HealthTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030HubeiChina Key Laboratory of Environment and Health Ministry of Education&Ministry of Environmental Protectionand State Key Laboratory of Environmental Health(Incubating)School of Public HealthTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030HubeiChina

Coal is one of the world’s main energy resources,accounting for approximately 68%of china’s current total {1. ***,several studies have demonstrated that dust,exhaust fumes,and other harmful factors in coal mines increase the risk of cardiovascular disease(CVD)among miners^([1.).Arterial stiffness(AS)is an independent risk factor of CVD,and epidemiological studies have shown that AS plays a vital role in assessing the risk of CVD^([2]).

关键词： Arterial cardiovascular assessing

A mixed-valence polyoxometalate-based 3D inorganic framework cathode material for high-efficiency rechargeable AZIBs

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第8期43卷 3677-3691页

作者： Qing Han Hao-Ran Xiao Tao Zhou Bing-Chuan Li Liu Yang Ling-Ling Xie xue-Jing Qiu Xian-Yong Wu Li-Min {1. Xiao-Yu Cao School of Chemistry and Chemical engineering Henan University of TechnologyZhengzhou 450001China Key Laboratory of High Specific Energy Materials for Electrochemical power Sources of Zhengzhou City Zhengzhou 450001China college of Materials {1. Henan University of EngineeringZhengzhou450007China School of Environmental engineering Henan University of TechnologyZhengzhou 450001China Department of Chemistry University of Puerto Rico-Rio Piedras CampusSan JuanPR 00925USA

The global trend towards new energy storage systems has stimulated the development of electrochemical energy storage *** these technologies,rechargeable aqueous zinc-ion batteries(AZIBs)have attracted considerable interest as a potential alternative to lithium-ion batteries(LIBs)due to their affordable cost,environmental compatibility and high safety *** this study,a high-quality electrode for AZIBs has been successfully developed using a dehydrated mixed-valence polyoxometalate-based three-dimensional(3D)inorganic framework material known as[H_6Mn_(3)V^Ⅳ_(1.)V-^Ⅴ_(4O)_(46)(H_2O)_(1.)](3D-MnVO).This innovative 3D-MnVO material is built from the alternate connections of{V_(1.)O_(46)}"sphere-shaped"clusters andμ_(2)-{Mn(H_(2)O)_(4)}bridges,where each{V_(1.)O_(46)}cluster is surrounded by three pairs of vertically distributed{Mn(H_(2)O)_(4)}units,thus resulting in the 3D interpenetrating grid-like network from the infinite[-{V_(1.)O_(46)}-μ_(2)-Mn(H_(2)O)_(4)-{V_(1.)O_(46)}]_∞chains in three mutually perpendicular *** 3D framework structure of 3D-MnVO possesses abundant oxygen vacancies,spacious and multi-level interconnected channels for ion transport,which facilitates the efficient intercalation/deintercalation of hydrated Zn^(2+)into the pores of the primary structure via the intercalation capacitance *** a result,the 3D-MnVO electrode exhibits excellent diffusion rates and minimal interfacial *** a current density of 0.1.A·g^(-1.,the 3D-MnVO cathode delivers a commendable discharge capacity of1.0.5 mAh·g^(-1.with 81.6%capacity retention after1.0 charge/discharge ***,even at a high current density of 1.0 A·g^(-1.,the 3D-MnVO electrode delivers a remarkable reversible capacity of1.8.9 mAh·g^(-1..Our research results provide valuable insights into the development of advanced polyoxometalate-based 3D inorganic framework electrode materials for high-performance rechargeable AZIBs.

关键词： Cathode Polyoxometalate 3D inorganic framework Zinc-ion batteries Energy storage mechanism

在线全文

学校读者我要写书评

暂无评论

双质量飞轮式扭振减振器扭振模型分析

武汉理工大学学报 2009年第8期31卷 133-136页

作者：丁原潘毓学长春理工大学机电工程学院长春130022 长春大学机械工程学院长春130022

以国产某中型柴油车为研究对象,介绍了双质量飞轮式扭振减振器的结构特点,建立了2个动力传动系统扭振分析模型,编制了广义Jacobi算法的计算机程序,对双质量飞轮式扭振减振器对汽车的振动控制影响进行了计算分析,并对动力传动系扭转受迫... 详细信息

以国产某中型柴油车为研究对象,介绍了双质量飞轮式扭振减振器的结构特点,建立了2个动力传动系统扭振分析模型,编制了广义Jacobi算法的计算机程序,对双质量飞轮式扭振减振器对汽车的振动控制影响进行了计算分析,并对动力传动系扭转受迫振动作了仿真分析,结果表明文中所述研究方法对于控制车辆的振动和噪音是有实用价值的。

关键词：双质量飞轮式扭振减振器扭振模型车辆仿真

Intelligent Co-ordinate Control for Mating Process of Underwater Vehicle Based on TFPN

在线全文

学校读者我要写书评

暂无评论

哈尔滨工程大学学报（英文版） 2002年第2期1卷 23-27页

作者： YAN Zhe-ping ,DAI xue-feng ,BIAN Xin-qian1. Department of {1. and Electrical engineering, Harbin Institute of technology, Harbin 1.0001. china 2. college of power and Nuclear engineering, Harbin engineering university, Harbin 1.0001. china Harbin Institute of technology Department of Mechanical and Electrical Engineering Harbin China (GRID:grid.19373.3f) (ISNI:***) Harbin engineering {1. College of Power and Nuclear Engineering Harbin China (GRID:grid.33764.35) (ISNI:***)

In order to reduce time and improve the probability of successful matting it is useful to co-ordinate between the movement control and mating process of the underwater vehicle. Because it is hard to control with the common method under the condition of mating process, the hierarchical intelligent control is introduced. Timed fuzzy Petri net (TFPN), which is the integration of PN and fuzzy reasoning, is used in the design of coordinate level of hierarchically intelligent control. It made the control process better in reflecting the characteristics of time-driven, event-driven, fuzzy information and so on. The test shows that TFPN could shorten the time of mating and enhance the efficiency.

关键词： underwater vehicle mating timed fuzzy Petri net

Research and Test on the Principle of Oil Temperature Rise of Pumps with Single and Double Valve Plate

在线全文

学校读者我要写书评

暂无评论

Research and Test on the Principle of Oil Temperature Rise o...

Semitransparent organic photovoltaics enabled by transparent p-type inorganic semiconductor and near-infrared acceptor

The Fifth International Conference on Fluid Mechanics

作者： D.S.Wen~1.J.Wen~2 X.J.zhu~1.1.Department of {1. engineeringYanshan university Qinhuangdao 066004 china 2 college of Information Science and engineering Yanshan university Qinhuangdao 066004 china

＜正＞Oil temperature rise and cooling of an axial piston pump are of significant factors which affect the service lifetime of the *** they are important aspects in the theoretic research of the fluid power *** temperature rise and cooling existing in the research and test of CY1.-1. pump and 25KZB pump are *** relevant expression and analysis are *** two types of pump are tested and the results show that the pump with double valve plate has self-cooling performance and the lubrication between rubbing parts is improved greatly.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第9期96卷 351-358页

作者： xue Yan Jiayu Wang Wei He Top Archie Dela Peña Can {1. Hailin Yu Yingyue Hu Cenqi Yan Shengqiang Ren Xingyu Chen Zhe Wang Jiaying Wu Mingjie Li Jianlong Xia Lei Meng Shirong Lu Dewei Zhao Mikhail Artemyev Yongfang Li Pei Cheng college of Polymer Science and {1. State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065SichuanChina Department of Applied Physics The Hong Kong Polytechnic UniversityKowloonHong Kong 999077China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China college of Materials Science and {1.&{1. Research Center of Alternative Energy Materials&Devices Ministry of EducationSichuan UniversityChengdu 610065SichuanChina Department of Material Science and technology Taizhou UniversityTaizhou 318000ZhejiangChina Advanced Materials Thrust Function HubThe Hong Kong University of Science and Technology(Guangzhou)Guangzhou 511400GuangdongChina State Key Laboratory of Advanced technology for Materials Science and Processing Center of Smart Materials and DevicesWuhan University of TechnologyWuhan 430070HubeiChina Department of Civil1.d Environmental engineering The Hong Kong University of Science and TechnologyHong Kong 999077China Research Institute for Physical Chemical Problems Belarusian State UniversityMinsk 220006Belarus

Semitransparent organic photovoltaics(STOPVs)have gained wide attention owing to their promising applications in building-integrated photovoltaics,agrivoltaics,and floating *** semiconductors with high charge carrier mobility usually have planar and conjugated structures,thereby showing strong absorption in visible *** this work,a new concept of incorporating transparent inorganic semiconductors is proposed for high-performance ***(I)thiocyanate(CuSCN)is a visible-transparent inorganic semiconductor with an ionization potential of 5.45 eV and high hole *** transparency of CuSCN benefits high average visible transmittance(AVT)of *** energy levels of CuSCN as donor match those of near-infrared small molecule acceptor BTP-eC9,and the formed heterojunction exhibits an ability of exciton *** mobility of CuSCN contributes to a more favorable charge transport channel and suppresses charge *** control STOPVs based on PM6/BTP-eC9 exhibit an AVT of 1..0%with a power conversion efficiency(PCE)of 1..7%.Partial replacement of PM6 with CuSCN leads to a 63%increase in transmittance,resulting in a higher AVT of 30.9%and a comparable PCE of 1..8%.

关键词： Copper(I)thiocyanate Inorganic semiconductor Semitransparent Organic photovoltaics Charge dissociation

Fe-N_(x) sites coupled with core-shell FeS@C nanoparticles to boost the oxygen catalysis for rechargeable Zn-air batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第3期90卷 565-577,I0013页

作者： Katam Srinivas zhuo Chen Anran Chen Fei Ma Ming-qiang zhu Yuanfu Chen School of Integrated Circuit Science and engineering and State Key Laboratory of Electronic Thin Films and Integrated DevicesUniversity of Electronic Science and Technology of ChinaChengdu 610054SichuanChina college of {1. and Electronic engineering Northwest A&F UniversityYangling 712100ShaanxiChina School of Materials and Energy Yunnan UniversityKunming 650091YunnanChina

The development of efficient single-atom catalysts(SACs) for the oxygen reduction reaction(ORR)remains a formidable challenge,primarily due to the symmetric charge distribution of metal singleatom sites(M-N_(4)).To address such issue,herein,Fe-N_(x) sites coupled synergistic catalysts fabrication strategy is presented to break the uniform electronic distribution,thus enhancing the intrinsic catalytic ***,atomically dispersed Fe-N_(x) sites supported on N/S-doped mesoporous carbon(NSC)coupled with FeS@C core-shell nanoparticles(FAS-NSC@950) is synthesized by a facile hydrothermal reaction and subsequent *** to the presence of an in situ-grown conductive graphitic layer(shell),the FeS nanoparticles(core) effectively adjust the electronic structure of single-atom Fe sites and facilitate the ORR kinetics via short/long-range coupling ***,FAS-NSC@950displays a more positive half-wave potential(E_(1.2)) of 0.871.V with a significantly boosted ORR kinetics(Tafel slope=52.2 mV dec^(-1.),outpacing the commercial Pt/C(E_(1.2)=0.84 V and Tafel slope=54.6 mV dec^(-1.).As a bifunctional electrocatalyst,it displays a smaller bifunctional activity parameter(ΔE) of 0.673 V,surpassing the Pt/C-RuO_(2) combination(ΔE=0.724 V).Besides,the FAS-NSC@950-based zincair battery(ZAB) displays superior power density,specific capacity,and long-term cycling performance to the Pt/C-Ir/C-based *** work significantly contributes to the field by offering a promising strategy to enhance the catalytic activity of SACs for ORR,with potential implications for energy conversion and storage technologies.

关键词： Fe-N_(x)sites Core-shell FeS@C Synergistic interactions Oxygen reduction reaction Zn-air battery