检索结果-南通市图书馆

面向冗余机械臂逆运动学问题的人工蜂群算法改进

在线全文

学校读者我要写书评

暂无评论

机械工程学报 2024年第15期60卷 60-70页

作者：石建平徐永驰古训陈冬云贵阳学院电子与通信工程学院贵阳550005

逆运动学问题是机器人学中最重要和最复杂的问题之一,以末端执行器的位姿误差最小化为优化目标,该问题可以转换成一个等效的最小优化问题,并利用智能优化算法进行优化求解。为有效解决冗余机械臂的逆运动学问题,提出一种改进的人工蜂群... 详细信息

逆运动学问题是机器人学中最重要和最复杂的问题之一,以末端执行器的位姿误差最小化为优化目标,该问题可以转换成一个等效的最小优化问题,并利用智能优化算法进行优化求解。为有效解决冗余机械臂的逆运动学问题,提出一种改进的人工蜂群算法。改进算法在引领蜂阶段、跟随蜂阶段和侦察蜂阶段分别提出不同的蜜源搜索方程,从而在进化过程中形成多策略混合协同进化效应,较好平衡了算法的全局探索与局部开发,同时有效克服了基本人工蜂群算法在引领蜂和跟随蜂阶段采用相同的单维搜索方程所带来的后期收敛速度慢、计算精度不高等缺点。以7自由度冗余机械臂的逆运动学求解为例进行对比实验,结果表明:与对比算法比较,该算法具有更高的收敛精度、更快的收敛速度以及更强的寻优稳定性,可用于有效解决冗余机械臂的逆运动学问题。

关键词：冗余机械臂逆运动学人工蜂群算法多策略协同进化

Selective separation of oil-in-water emulsion with high efficiency by bio-inspired Janus membrane

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2021年第10期64卷 2211-2219页

作者： CAI YaHui chen dongyun LI NaJun XU QingFeng LI Hua HE JingHui LU JianMei College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China

The efficient and rapid separation of oil from stabilized oil-in-water emulsions with micro/nanometer size is a global *** to the low oil content in oil-in-water emulsions,separating the oil by simply controlling the surface wettability is *** the pore size of the membrane surface to achieve separation will lead to a sharp decrease in ***,inspired by cell membrane transportation,a hydrophilic/hydrophobic bifunctional Janus membrane for stable oil-in-water separation was prepared by simple surface polymerization and vapor *** prepared Janus membrane contained a hydrophobic side and hydrophilic polyamine *** used for oil-in-water emulsion separation,the polyamine layer accumulated micro/nanometer oil droplets,forming an oil layer on the hydrophobic *** was retained by the 1H,1H,2H,2H-perfluorooctyl trichlorosilane layer,allowing oil droplets to selectively permeate through the membrane,achieving the separation *** the pore size of the modified fabric was basically unchanged,the permeation flux was fast(1.53×10^(3) Lm^(−2) h^(−1)).Furthermore,the poly(N,N-dimethylaminoethyl methacrylate)layer destroyed the emulsion stability,making the emulsion droplets aggregate without affecting the separation efficiency with fast permeation ***,the prepared bifunctional Janus membrane shows great potential for actual wastewater treatment.

关键词： bifunctional Janus membrane demulsification function oil-in-water emulsion separation superhydrophobicity/superoleophilicity surface chemistry

Negative effect on molecular planarity to achieve organic ternary memory: triphenylamine as the spacer

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2016年第6期59卷 692-698页

作者： Shugang Xia Jinghui He Hua Li Qingfeng Xu Najun Li dongyun chen Jianmei Lu College of Chemistry Chemical Engineering and Materials ScienceCollaborative Innovation Center of Suzhou Nano Science and TechnologySoochow University

Adjusting the spacers between the electron-acceptor and the elector-donor is important to design organic ternary memory material but rarely reported. In this paper, two small molecules, ZIPGA and ZIPCAD with benzene ring or triphenylamine as the spacers, were designed and synthesized to fabricate memory devices. The A1/ZIPGA/indium-tin oxide （ITO） device showed ternary characteristics, whereas A1/ZIPCAD/ITO had no obvious memory characteristics. Density functional theory calculation, X-ray diffraction （XRD） and atomic force microscopy （AFM） were employed to interpret the different memory properties. ZIPGA thin film has the closer intermolecular packing and flatter surface morphology than ZIPCAD film, which was favorable to the electron migration. This work demonstrates the importance of spacers and reveals that triphenylamine may be not a good spacer in design of new memory material.

关键词： small molecules different spacers ternary memory device molecular stacking

PVDF/PLA electrospun fiber membrane impregnated with metal nanoparticles for emulsion separation,surface antimicrobial,and antifouling activities

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2023年第5期66卷 1461-1470页

作者： XIANG Xin chen dongyun LI NaJun XU QingFeng LI Hua HE JingHui LU JianMei College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou215123China

Although many superwetting materials have been designed for the treatment of oil-containing wastewater,separation strategies for oil-in-water systems containing bacteria have rarely been ***,poly(vinylidene difluoride)-and poly(lactic acid)-blended fibrous membranes loaded with silver and copper oxide nanoparticles were successfully prepared by a two-step method of electrostatic spinning and liquid-phase *** product membrane showed excellent super-oleophilic properties in air and hydrophobicity under *** could separate water-in-oil emulsion systems containing surfactants with an efficiency above90%.More importantly,the nanoparticle-loaded fibers were characterized by material degradability and slowly released *** fibers exhibited excellent antibacterial activities against both gram-positive and-negative *** work provides a feasible strategy for water-in-oil emulsion separation and bacterial treatment of wastewater.

关键词： emulsion separation antibacterial activity electrostatic spinning Ag nanoparticles

Pt–Pd bimetallic nanoparticles anchored on uniform mesoporous MnO_(2) sphere as an advanced nanocatalyst for highly efficient toluene oxidation

在线全文

学校读者我要写书评

暂无评论

Green Energy & Environment 2022年第6期7卷 1349-1360页

作者： Jiaqin He dongyun chen Najun Li Qingfeng Xu Hua Li Jinghui He Jianmei Lu College of Chemistry Chemical Engineering and Materials ScienceCollaborative Innovation Center of Suzhou Nano Science and TechnologySoochow UniversitySuzhouJiangsu215123China

Improving catalytic performance is a yet still challenge in thermal catalytic ***,uniform mesoporous MnO_(2) nanospheresupported bimetallic Pt–Pd nanoparticles were successfully fabricated via a SiO_(2) template strategy for the total catalytic degradation of volatile organic compounds at low *** introduction of mesopores into the MnO_(2) support induces a large specific surface area and pore size,thus providing numerous accessible active sites and enhanced diffusion ***,the addition of a secondary noble metal can adjust the O_(ads)/O_(latt) molar ratios,resulting in high catalytic *** them,the catalyst having a Pt/Pd molar ratio of 7:3 exhibits optimized catalytic activity at a weight hourly space velocity of 36,000 mL g^(-1) h^(-1),reaching 100%toluene oxidation at 175℃ with a lower activation energy(57.0 kJ mol^(-1))than the corresponding monometallic Pt or non-Pt-based catalysts(93.8 kJ mol^(-1) and 214.2 kJ mol^(-1)).Our findings demonstrate that the uniform mesoporous MnO_(2) nanosphere-supported bimetallic Pt–Pd nanoparticles catalyst is an effective candidate for application in elimination of toluene.

关键词： MnO_(2)nanospheres Mesoporous structure Pt-Pd bimetal VOCs oxidation

A mini-review on ZnIn_(2)S_(4)-Based photocatalysts for energy and environmental application

在线全文

学校读者我要写书评

暂无评论

Green Energy & Environment 2022年第2期7卷 176-204页

作者： Guping Zhang Hao Wu dongyun chen Najun Li Qingfeng Xu Hua Li Jinghui He Jianmei Lu College of Chemistry Chemical Engineering and Materials ScienceCollaborative Innovation Center of Suzhou Nano Science and TechnologySoochow UniversitySuzhouJiangsu215123China

As one of the most attractive and eco-friendly technologies,semiconductor photocatalysis is demonstrated as a potential strategy to solve global energy shortage environmental pollution *** semiconductor-based photocatalysts,Zinc indium sulfide(ZnIn_(2)S_(4)) with various morphological structures has become research hotspots owing to its superior visible light absorption,high chemical durability and low ***,the photocatalytic activity of pristine ZnIn_(2)S_(4) is unsatisfactory due to limited range of visible light absorption and fast recombination rate of light-induced electrons and *** modification strategies,such as metal deposition,element doping,vacancy engineering and semiconductor combination,have been systematically developed for enhancing the photocatalytic performance of ZnIn_(2)S_(4) *** order to promote further developments of ZnIn_(2)S_(4) in photocatalytic applications,this mini-review summarizes the progress of recent research works for the construction of highly activity ZnIn_(2)S_(4)-based photocatalysts for the first *** addition,the typical applications of ZnIn_(2)S_(4)-based photocatalytic materials have been critically reviewed and described such as in hydrogen evolution from photocatalytic water splitting,carbon dioxide photoreduction,and treatment of water *** current challenges and further prospects for the development of ZnIn_(2)S_(4) semiconductor photocatalysts are finally pointed out.

关键词： energy visible durability

A highly dispersed Pt/copper modified-MnO_(2)catalyst for the complete oxidation of volatile organic compounds:The effect of oxygen species on the catalytic mechanism

在线全文

学校读者我要写书评

暂无评论

Green Energy & Environment 2023年第2期8卷 538-547页

作者： Xunxun Li Yaru Wang dongyun chen Najun Li Qingfeng Xu Hua Li Jinghui He Jianmei Lu College of Chemistry Chemical Engineering and Materials ScienceCollaborative Innovation Center of Suzhou Nano Science and TechnologySoochow UniversitySuzhouJiangsu215123China

Manganese oxide(MnO_(2))exhibits excellent activity for volatile organic compound ***,it is currently unknown whether lattice oxygen or adsorbed oxygen is more conducive to the progress of the catalytic *** this study,novel hollow highly dispersed Pt/Copper modified-MnO_(2)catalysts were ***^(2+)was stabilized into theδ-MnO_(2)cladding substituting original K+,which produced lattice defects and enhance the content of adsorbed *** 2.03 wt%Pt Cu_(0.050)-MnO_(2)catalyst exhibited the highest catalytic activity and excellent stability for toluene and benzene oxidation,with T_(100)=160℃under high space velocity(36,000 mL g^(-1)h^(-1)).The excellent performance of catalytic oxidation of VOCs is attributed to the abundant adsorbed oxygen content,excellent low-temperature reducibility and the synergistic catalytic effect between the Pt nanoparticles and Cu_(0.050)-MnO_(2).This study provides a comprehensive understanding of the Langmuir-Hinshelwood(L-H)mechanism occurring on the catalysts.

关键词： Oxygen species Toluene Benzene d-MnO_(2) Hollow

2D/2D hierarchical Co_(3)O_(4)/ZnIn_(2)S_(4)heterojunction with robust builtin electric field for efficient photocatalytic hydrogen evolution

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第5期16卷 6134-6141页

作者： Guping Zhang Xunxun Li Mengmeng Wang Xueqing Li Yaru Wang Shuting Huang dongyun chen Najun Li Qingfeng Xu Hua Li Jianmei Lu College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China

Because of its importance in enhancing charge separation and transfer,built-in electric field engineering has been acknowledged as an effective technique for improving photocatalytic ***,a stable p–n heterojunction of 2D/2D(2D:twodimensional)Co_(3)O_(4)/ZnIn_(2)S_(4)with a strong built-in electric field is precisely *** Co_(3)O_(4)/ZnIn_(2)S_(4)heterojunction exhibits a higher visible-light photocatalytic hydrogen(H2)evolution rate than the individual components,which is primarily attributed to the synergy effect of improved light absorption,abundant active sites,short charge transport distance,high separation efficiency of photogenerated ***,the photoelectrochemical studies and density functional theory(DFT)calculation results demonstrate that the enhanced interfacial charge separation and migration induced by the generated built-in electric field are the critical reasons for the boosted photocatalytic *** research might pave the way for the rational design and manufacturing of 2D/2D heterojunction photocatalysts with extremely efficient photocatalytic performance for solar energy conversion.

关键词： 2D/2D heterojunction photocatalysis built-in electric field interfacial charge transfer H_(2)evolution

＂Leading Female Dirctors＂at China Cultural Centers——Moving the Spring Festival Temple Fair to Cairo

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

China & The World Cultural Exchange 2016年第3期82卷 15-16页

作者： chen dongyun

It is now time to celebrate the Lunar New Year. China Cultural Center in Cairo has begun intense preparation for the ＂Happy Spring Festival Temple Fair＂, which is a priority for the center each year.When I first came to China Cultural Center in Cairo for work in 2010, it was the first time that the overseas cel- ebration activity of the Lunar New Year was named as ＂Happy Chinese New Year＂. My colleagues and I had success- fully held the first ＂Happy Chinese New Year＂ temple fair in the satellite town of Cairo,

关键词：文化中心开罗春节中国庙会移动导演筹备工作