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Multi-objective optimization design of wheat centralized seed feeding device based on particle swarm optimization (PSO) algorithm

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International Journal of Agricultural and Biological Engineering 2020年第6期13卷 76-84页

作者： Qingqing Wang zhaodong li Weiwei Wang Chunling Zhang liqing Chen ling Wan College of Engineering Anhui Agricultural UniversityHefei 230036China Anhui Province Engineering Laboratory of Intelligent Agricultural Machinery and Equipment Hefei 230036China

In order to solve the problem of interaction between multiple evaluation indexes of seed metering performance under multiple factors of centralized seed feeding device,a multi-objective optimization of structure based on particle swarm optimization(PSO)algorithm was proposed in this *** wheat centralized seed feeding device was taken as the research object,and the experimental factors were cone angle of type hole,working speed and seed filling *** working process of wheat centralized seed feeding device was simulated by discrete element method(DEM).The average seed number of type hole,the variation coefficient of the average seed number of type hole,and the maximum tangential force between seed and seed feeding mechanism were selected as the evaluation *** the variance analysis of the evaluation indexes by the experimental factors,the optimization objective function was *** PSO algorithm,the multi-objective optimization was carried out for the wheat centralized seed feeding *** optimization results show that the best structural combination parameters of the wheat centralized seed feeding device are the hole cone angle of 31.6°and the seed filling gap of 4.6 *** validity of the method was verified by simulation and field *** results show that the PSO algorithm multi-objective optimization method proposed in this paper can provide a reference for the structural improvement and optimal design of the centralized seed feeding device.

关键词： centralized seed feeding device multi-objective optimization PSO algorithm

Single-layer graphene as a highly selective barrier for vanadium crossover with high proton selectivity

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Journal of Energy Chemistry 2021年第8期30卷 419-430,I0009页

作者： Saheed Bukola zhaodong li Jason Zack Christopher Antunes Carol Korzeniewski Glenn Teeter Jeffrey Blackburn Bryan Pivovar National Renewable Energy Laboratory(NREL) 80401 GoldenUnited States Department of Chemistry Texas Tech University79409 LubbockUnited States*Corresponding author(email:Saheed.Bukola@nrel.gov

We report near-zero crossover for vanadium cross-permeation through single-layer graphene immobilized at the interface of two Nafion?polymer electrolyte *** ion diffusion and migration,including proton mobility through membrane composites,were studied with and without graphene under diffusion and migration ***-layer graphene was found to effectively inhibit vanadium ion diffusion and migration under specific *** single-layer graphene composites also enabled remarkable ion transmission selectivity improvements over pure Nafion membranes,with proton transport being four orders of magnitude faster than vanadium ion *** values of 0.02±0.005Ωcm^(2) for proton and 223±4Ωcm^(2) for vanadium ion through single atomic layer graphene are *** high selectivity may have significant impact on flow battery applications or for other electrochemical devices where proton conductivity is required,and transport of other species is *** results emphasize that crossover may be essentially completely eliminated in some cases,enabling for greatly improved operational viability.

关键词： Ion selectivity Polymer electrolyte membrane Redox flow battery Single-layer graphene Vanadium crossover 2D nanomaterial

Ausforming effects on anisotropy of mechanical properties in HSLA martensitic steel

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Science China(Technological Sciences) 2012年第7期55卷 1806-1813页

作者： li zhaodong SUN XinJun CAO WenQuan YONG QiLong YANG ZhiGang DONG Han WENG YuQing Institute for Structural Materials Central Iron and Steel Research InstituteBeijing 100081China Department of Materials Science and Engineering Tsinghua UniversityBeijing 100084China The Chinese Society-for Metals Beijing 100711China

In order to clarify effects of prior pancaked austenitic structure on microstructure and mechanical properties of transformed martensite in ausformed steel,a super-thin pancaked austenite was processed by multi-pass rolling in a 0.03-2.6Mn0.06Nb-0.01Ti(wt%) low alloy *** evolution of prior pancaked austenite grain during multi-pass rolling was studied using Ni-30Fe model *** with the structure and texture in the prior super-thin pancaked austenite in Ni-30Fe alloy,the texture and anisotropy of mechanical properties of transformed martensite in the studied ausformed steel were focused *** were mainly three kinds of rolling texture components in the super-thin pancaked austenite:Goss {110} 001,copper {112} 111 and brass {110} *** were further transformed into the weak {001} 110 and strong {112} 110,{111} 112 texture components in the martensitic *** orientation relationship(OR) of lath martensite transformation from pancaked austenite in the ausformed steel deviated larger from the exact Kurdjumov-Sachs(K-S) OR than in the case of equiaxed austenite without *** tensile and yield strengths of the ausformed martensitic steel first decreased and then increased as the angle between tension direction and rolling direction *** main reason for the anisotropy of strength was considered as the texture component {112} 110 in ***,the anisotropy of impact toughness was more complex and the main reasons for it are unknown.

关键词： pancaked austenite lath martensite texture strength and toughness HSLA steel

Design method and experiment of machinery for combined application of seed,fertilizer and herbicide

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International Journal of Agricultural and Biological Engineering 2019年第4期12卷 63-71页

作者： Xin Huang Weiwei Wang zhaodong li Qingqing Wang Cunxi Zhu liqing Chen Key Laboratory of Plant Protection Engineering Ministry of Agriculture and Rural AffairsJiangsu UniversityZhenjiang 212013China Key Laboratory of Modern Agricultural Equipment and Technology Ministry of EducationJiangsu UniversityZhenjiang 212013China College of Engineering Anhui Agricultural UniversityHefei 230036China Anhui Province Engineering Laboratory of Intelligent Agricultural Machinery and Equipment Hefei 230036China

This study aimed to resolve the problems of full wheat straw returning to the field,which might readily cause stalk obstruction,poor sowing quality,and serious weeds at the seedling stage,affecting the growth of *** on the idea of“simultaneous seeding and spraying,closed weeding”,this paper presented a design method for designing a corn seed-fertilizer-herbicide simultaneous operation machine,which focuses on the design of vertical active straw-removing anti-blocking device mechanism,design of nozzle key parameters,nozzle selection,seeding monomer analysis and spatial layout design of seed-fertilizer-herbicide *** addition,the interrelated formulas were deduced and machine design and field experiment were *** experiment results showed that the average variation coefficient of spray uniformity of machines was 17.70%.The post-experiment weed amount was 8.9%,which was lower than that before sowing,8.5%lower than that before artificially closed weeding,and 14.3%lower than that in unenclosed weeding ***,the weeds were less in the working area of the machine,and the growth of corn was *** with manual closed weeding,the average plant height uniformity and average stem diameter uniformity increased by 4.4%and 5.1%,*** with unclosed weeding,the average plant height uniformity and average stem diameter uniformity increased by 18.3%and 10.8%,***,the rationality of the design method proposed in this paper was validated,and these can lay a foundation for the research and development of the same type of machine.

关键词： seed-fertilizer-herbicide combined application precision seeding machine spray device closed weeding

Echinacea purpurea-derived homogeneous polysaccharide exerts anti-tumor efficacy via facilitating M1 macrophage polarization

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The Innovation 2023年第2期4卷 68-76,67页

作者： Wenkai Ren Junfeng Ban Yaoyao Xia Fang Zhou Caihong Yuan Huanhuan Jia Hailan Huang Mingmin Jiang Minjian liang zhaodong li Youyong Yuan Yulong Yin Hong Wu State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources Laboratory for Lingnan Modern AgricultureSouth China Agricultural UniversityGuangzhou 510642China Guangdong Technology Research Center for Traditional Chinese Veterinary Medicine and Natural Medicine South China Agricultural UniversityGuangzhou 510642China Guangdong Provincial Key Laboratory of Advanced Drug Delivery Systems Guangdong Pharmaceutical UniversityGuangzhou 510006China Sericulture&Agri-Food Research Institute Guangdong Academy of Agricultural Sciences Key Laboratory of Functional FoodsMinistry of Agriculture and Rural AffairsGuangdong Key Laboratory of Agricultural Products ProcessingGuangzhou 510640China Key Laboratory of Guangdong Laboratory Animals Guangdong Laboratory Animals Monitoring InstituteGuangzhou 510663China School of Biomedical Sciences and Engineering South China University of TechnologyGuangzhou International CampusGuangzhou 511442China Institute of Subtropical Agriculture Chinese Academy of SciencesChangsha 511442China

Echinacea purpurea modulates tumor progression,but the underlying mechanism is poorly *** isolated and purified a novel homogeneous polysaccharide from ***(EPPA),which was shown to be an arabinogalactan with a mean molecular mass(Mr)of 3.8×10^(4)Da and withα-(1→5)-L-Arabinan as the backbone and a-L-Araf-(1→,→6)-b-D-Galp-(1→,and →4)-α-D-GalpA-(1/as the side ***,oral administration of EPPA suppresses tumor progression in vivo and shapes the immune cell profile(e.g.,facilitating M1 macrophages)in tumor micro-environment by single-cell RNA sequencing(scRNA-seq)analysis.

关键词： purpurea macrophage analysis.

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数字经济、全球价值链嵌入与城市创新韧性

统计与决策 2024年第19期40卷 84-89页

作者：李照东西北政法大学国际法学院西安710122

增强城市创新韧性是维持经济平稳运行的重要策略,亦是推动社会治理模式创新的关键手段。文章基于2012—2021年中国30个省份的面板数据,就数字经济对城市创新韧性的影响及渠道机制展开实证分析。结果显示:数字经济能够显著增强城市创新韧... 详细信息

增强城市创新韧性是维持经济平稳运行的重要策略,亦是推动社会治理模式创新的关键手段。文章基于2012—2021年中国30个省份的面板数据,就数字经济对城市创新韧性的影响及渠道机制展开实证分析。结果显示:数字经济能够显著增强城市创新韧性;中介效应检验结果表明,数字经济可通过提升全球价值链嵌入度,进一步增强城市创新韧性;分样本检验发现,数字经济对城市创新韧性的驱动作用在东部地区较强,在中西部地区不显著。因此,应超前部署数字基础设施建设,畅通全球价值链嵌入路径,实施差异化发展策略。

关键词：数字经济全球价值链嵌入城市创新韧性中介效应

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环境机会主义、问责需求和环境审计

审计与经济研究 2015年第2期30卷 33-42页

作者：李兆东南京审计学院审计与会计学院江苏南京211815 南京航空航天大学经济与管理学院江苏南京211106

通过分析环境机会主义行为的产生和控制,认为环境机会主义行为的存在和污染容忍度的下降产生了环境问责需要,问责需求产生环境审计。收集环境投资、水环境治理和能源消耗数据,分析其与相关环境审计结果公告之间的关系,发现环境保护的投... 详细信息

通过分析环境机会主义行为的产生和控制,认为环境机会主义行为的存在和污染容忍度的下降产生了环境问责需要,问责需求产生环境审计。收集环境投资、水环境治理和能源消耗数据,分析其与相关环境审计结果公告之间的关系,发现环境保护的投资问责驱动环境部门的预算执行审计,水环境污染及治理问责驱动水环境审计,节能减排的问责需求驱动节能减排审计,验证了环境审计由环境问责需求产生和变迁的理论构想。

关键词：环境机会主义环境审计预算执行审计绩效审计政府审计国家审计环境问责环境会计环境投资环境责任

光电耦合技术处理3,4-二甲基苯胺废水的协同效应

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环境工程学报 2019年第8期13卷 1875-1883页

作者：李肇东李孟唐建伟武汉理工大学市政工程系武汉430070 中国人民解放军95338部队广州510405

高级催化氧化法的复合水处理工艺经常出现协同效应,但对于协同效应的产生机理仍不清楚。因此,针对光电耦合催化氧化体系,采用协同度为量化指标,研究了不同光照、电流密度、曝气强度、初始pH等条件对光电耦合催化体系降解3, 4-二甲基苯胺... 详细信息

高级催化氧化法的复合水处理工艺经常出现协同效应,但对于协同效应的产生机理仍不清楚。因此,针对光电耦合催化氧化体系,采用协同度为量化指标,研究了不同光照、电流密度、曝气强度、初始pH等条件对光电耦合催化体系降解3, 4-二甲基苯胺(3,4-DMA)的协同效应的影响;并通过光助电催化实验、电助光催化实验和羟基自由基检测实验,探讨了协同效应存在的原因。结果表明,光电耦合催化氧化系统存在协同效应,且协同度受外部条件的影响。协同效应产生的原因主要包括:外加电场促进体系产生了更多的羟基自由基;紫外光照使得3,4-DMA及其降解中间产物受到激发而提高了对羟基自由基等活性氧物种的利用率;电催化过程中的析氧副反应为光催化提供了电子受体,从而提高了系统的总体降解效率。这为深入研究和人为调控协同效应提供了新的方法。

关键词：光电耦合催化氧化协同效应析氧副反应羟基自由基光量子激发

自然资源资产离任审计能提升环境治理效率吗?

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审计与经济研究 2023年第5期38卷 1-10页

作者：李兆东李振覃南京审计大学政府审计学院江苏南京211815

基于2010—2017年中国280个地级市的面板数据,以领导干部自然资源资产离任审计试点为准自然实验,利用多期双重差分模型,检验了领导干部自然资源资产离任审计对环境治理效率的作用,结果表明自然资源资产离任审计能够通过推动环境制度建... 详细信息

基于2010—2017年中国280个地级市的面板数据,以领导干部自然资源资产离任审计试点为准自然实验,利用多期双重差分模型,检验了领导干部自然资源资产离任审计对环境治理效率的作用,结果表明自然资源资产离任审计能够通过推动环境制度建设、强化环境监管能力和增加环境治理投入等路径,显著提升环境治理效率。进一步分析发现,自然资源资产离任审计在财政状况较好、资源承载力较弱以及未实施中央环保督察的地区对环境治理效率的提升作用更强。

关键词：自然资源资产离任审计环境治理效率环境制度环境监管环保督察