检索结果-南通市图书馆

基于EMTR模拟退火优化算法的配电网故障测距

在线全文

学校读者我要写书评

暂无评论

电气自动化 2024年第4期46卷 76-79,83页

作者：梅益鹏丁华建杨欢红钟伟牟学军赵恒亮柴磊国网浙江省电力有限公司义乌市供电公司浙江义乌322000 上海电力大学电气工程学院上海200090 国网浙江省电力有限公司金华供电公司浙江金华321000

针对配电网线路故障测距快速性和准确性不足的问题,提出一种基于电磁时间反转(electromagnetic time reversal,EMTR)模拟退火优化算法的配电网故障测距。根据配电网线路参数建立镜像线路网络,以测量点处时间反转后的电流建立电流源,并... 详细信息

针对配电网线路故障测距快速性和准确性不足的问题,提出一种基于电磁时间反转(electromagnetic time reversal,EMTR)模拟退火优化算法的配电网故障测距。根据配电网线路参数建立镜像线路网络,以测量点处时间反转后的电流建立电流源,并注入回镜像网络,以模拟退火算法加速假设故障位置的计算。建立配电网模型并设置多种情况进行数值试验。试验结果验证了方法的有效性。

关键词：电磁时间反转模拟退火算法配电网故障测距

在线全文

学校读者我要写书评

暂无评论

10kV架空线路防雷方案对比分析

电力与能源 2022年第6期43卷 501-506页

作者：赵恒亮陈星宇梅益鹏国网浙江义乌市供电有限公司浙江义乌322000

10kV架空线路的防雷工作一直是配电网安全运行的重中之重,防雷保护设计的优劣直接关系到大量用户的供电可靠性。对现有防雷绝缘子的配置方式与雷击跳闸率进行分析,针对架设避雷线防雷、使用复合绝缘横担防雷、过电压保护器防雷、过电压... 详细信息

10kV架空线路的防雷工作一直是配电网安全运行的重中之重,防雷保护设计的优劣直接关系到大量用户的供电可靠性。对现有防雷绝缘子的配置方式与雷击跳闸率进行分析,针对架设避雷线防雷、使用复合绝缘横担防雷、过电压保护器防雷、过电压保护器与防雷绝缘子配合防雷4种方案进行对比,发现现有技术的一些防雷保护措施各有优缺点,其中过电压保护器与防雷绝缘子配合防雷方案为最佳方案。

关键词：配电网架空线路过电压防雷

在线全文

学校读者我要写书评

暂无评论

南京市林区森林消防装备配备与使用情况研究

江苏科技信息 2016年第8期33卷 62-63页

作者：高一铭梅一鹏张迅南京森林警察学院江苏南京210023

森林消防装备是森林消防工作的基础,是森林防火灭火能力的体现。文章立足于南京市林区森林消防装备的配备与使用情况的实际,以南京市中山陵风景区为例,分析了林区的概况和防火现状,以及林区的消防装备的配备情况和使用过程中出现的问题... 详细信息

森林消防装备是森林消防工作的基础,是森林防火灭火能力的体现。文章立足于南京市林区森林消防装备的配备与使用情况的实际,以南京市中山陵风景区为例,分析了林区的概况和防火现状,以及林区的消防装备的配备情况和使用过程中出现的问题,并提出了一定的可行性建议,希望为南京市林区建设提供对策。

关键词：森林防火消防装备中山陵

A corrosion-resistant and age-hardenable Mg-Al-Mn-Ca-Ce dilute alloy with fine-grained structure processed by controlled rolling

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第32期163卷 223-236页

作者： Jia-Sheng Li mei-Xuan Li Zhen-Ming Hua Yuan-Ting Mo Kai Guan Min Zha yipeng Gao Hui-Yuan Wang Key Laboratory of Automobile Materials of Ministry of Education&School of Materials Science and Engineering Nanling CampusJilin UniversityChangchun 130025China State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130012China International Center of Future Science Jilin UniversityChangchun 130012China

Low strength and poor corrosion resistance are two long-standing bottlenecks with dilute Mg ***,we report that the corrosion resistance of Mg-0.6Al-0.5Mn-0.2Ca(wt.%)alloy sheet can be significantly improved by micro-alloying with 0.3 wt.%Ce,and the strength can be considerably augmented after aging *** optimization of strength,ductility,and corrosion resistance is difficult due to the inherent trade-off in Mg ***,our aged Mg-0.6Al-0.5Mn-0.2Ca-0.3Ce alloy features with yield strength(YS)of∼194 MPa,ultimate tensile strength(UTS)of∼265 MPa,elongation to failure(EF)of∼17.2%,and corrosion rate(CR)of 2.2 mm y^(−1),the combination of which exhibits competitive advantage over other comparative dilute Mg *** is found that Ce addition decreases the activity of cathodic phases,inhibits detrimental effects of Fe impurities,and forms a protective Ce-containing surface *** high strength stems from the precipitation of ordered Guinier-Preston(G.P.)zones dispersed in uniform fine grains with an average grain size of∼8.2μ*** atomic-scale *** result in a noticeable age hardening response but do not act as crack initiation and propagation site,so our alloy also performs satisfactory *** work sheds light on the design and fabrication of strong,ductile,and corrosion-resistant dilute magnesium alloys to be used in electronic products and automotive bodies.

关键词： Magnesium alloy Micro-alloying Aging G.P.zones Mechanical property Corrosion

聚吡咯修饰的羧甲基纤维素/磺化共轭微孔聚合物复合气凝胶光热转换净水性能研究

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

功能材料 2024年第5期55卷 5028-5037页

作者：宋玲彦马丽娜郭玉萍郭玉燕于家乐杨艺鹏杨一鸣陈丽华哈斯其美格西北民族大学化工学院兰州730030

淡水资源作为生命赖以生存的物质基础面临严重挑战,利用高效的太阳能驱动界面蒸发(SSG)是解决目前水资源短缺的重要手段,一种新型的多孔材料共轭微孔聚合物(CMPs)在水处理技术中具有重要作用。以CMC/SCMP为前躯体在其表面喷涂聚吡咯制... 详细信息

淡水资源作为生命赖以生存的物质基础面临严重挑战,利用高效的太阳能驱动界面蒸发(SSG)是解决目前水资源短缺的重要手段,一种新型的多孔材料共轭微孔聚合物(CMPs)在水处理技术中具有重要作用。以CMC/SCMP为前躯体在其表面喷涂聚吡咯制备了一种新型太阳能蒸发器(CMC/SCMP-PPy),喷涂聚吡咯增强了光吸收性能,光吸收率可达91%,实现了光热转化能力。该气凝胶在1 kW/m^(2)太阳条件下表现出良好的光热转换性能,蒸发效率可达85.57%。多孔结构和亲水特性使其具有优异的水传输能力,稳定的化结构使其具有优异的耐盐性以防止盐晶体沉积堵塞材料孔道,使其实现了光热转化能力。这项研究进一步优化了CMPs在废水的净化,实现了清洁能源的利用,为开发新型光热材料提供了新的思路。

关键词：共轭微孔聚合物太阳能驱动界面蒸发耐盐

A telomere-to-telomere reference genome provides genetic insight into the pentacyclic triterpenoid biosynthesis in Chaenomeles speciosa

在线全文

学校读者我要写书评

暂无评论

Horticulture Research 2023年第10期10卷 250-261页

作者： Shaofang He Duanyang Weng yipeng Zhang Qiusheng Kong Keyue Wang Naliang Jing Fengfeng Li Yuebin Ge Hui Xiong Lei Wu De-Yu Xie Shengqiu Feng Xiaqing Yu Xuekui Wang Shaohua Shu Zhinan mei College of Plant Science&Technology Huazhong Agricultural UniversityWuhan 430070China Wuhan Carboncode Biotechnologies Co. Ltd.Wuhan 430070China Sinopharm Zhonglian Pharmaceutical Co. Ltd.Wuhan 430070China College of Horticulture&Forestry Huazhong Agricultural UniversityWuhan 430070China School of Pharmaceutical Science South-Central Minzu UniversityWuhan 430074China Department of Plant and Microbial Biology North Carolina State UniversityRaleighNC 27695USA College of Horticulture Nanjing Agricultural UniversityNanjing 210095China

Chaenomeles speciosa(2n=34),a medicinal and edible plant in the Rosaceae,is commonly used in traditional Chinese *** date,the lack of genomic sequence and genetic studies has impeded efforts to improve its medicinal ***,we report the use of an integrative approach involving PacBio HiFi(third-generation)sequencing and Hi-C scaffolding to assemble a high-quality telomere-to-telomere genome of *** genome comprised 650.4 Mb with a contig N50 of 35.5 *** these,632.3 Mb were anchored to 17 pseudo-chromosomes,in which 12,4,and 1 pseudo-chromosomes were represented by a single contig,two contigs,and four contigs,*** pseudo-chromosomes had telomere repeats at both ends,and four had telomere repeats at a single *** sequences accounted for 49.5%of the genome,while a total of 45515 protein-coding genes have been *** genome size of *** was relatively similar to that of Malus *** or contracted gene families were identified and investigated for their association with different plant metabolisms or biological *** particular,functional annotation characterized gene families that were associated with the biosynthetic pathway of oleanolic and ursolic acids,two abundant pentacyclic triterpenoids in the fruits of *** together,this telomere-to-telomere and chromosome-level genome of *** not only provides a valuable resource to enhance understanding of the biosynthesis of medicinal compounds in tissues,but also promotes understanding of the evolution of the Rosaceae.

关键词： value. insight metabolism

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

农用柴油机在肉牛养殖中的应用

农业工程 2024年第4期14卷 5-8页

作者：杨昌敏赵帮泰郭曦程方平王义鹏张巍梅林森陈苗苗四川省农业机械科学研究院四川成都610066

柴油机是我国农业生产中不可或缺的动力源,农用柴油机种类繁多、经济性好、适应性强。近年来,伴随我国饮食结构调整,国家实施粮改饲、粮改畜,以肉牛养殖等为主的畜牧养殖业得到大力发展,机械化养殖作为现代化肉牛养殖的重要支撑,养殖各... 详细信息

柴油机是我国农业生产中不可或缺的动力源,农用柴油机种类繁多、经济性好、适应性强。近年来,伴随我国饮食结构调整,国家实施粮改饲、粮改畜,以肉牛养殖等为主的畜牧养殖业得到大力发展,机械化养殖作为现代化肉牛养殖的重要支撑,养殖各环节以柴油机为动力的农业机械得到了大量应用。以肉牛养殖为例,阐述了农用柴油机在牧草生产、收获、加工,以及肉牛饲喂和废弃物处理环节的配套应用,分析农用柴油机发展中存在的工作稳定性较差、噪声和排放较大问题,提出应用电控高压喷射等先进技术提升农用柴油机性能、做好农用柴油机与专业农机具的配套适应性,以及加强农用柴油机制造工艺和强化生产过程管理的发展策略。

关键词：农用柴油机单缸多缸肉牛养殖畜牧机械化

RNAi screening identifies that sPRDM16 is an important molecule for prostate cancer cell apoptosis

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

RNAi screening identifies that sPRDM16 is an important molec...

Risk factors and molecular epidemiology of canine rabies in Beijing

2015年浙江省泌尿外科学男科学学术年会

作者： yipeng Xu Shaoxing Zhu mei Song Zongping Wang Fangyin Li Department of Urology Zhejiang Cancer Hospital Department of Ultrasound Zhejiang Cancer Hospital

Introduction and Objective:Histone methylate,regulated by histone methyltransferases(HMTs)and histone demethylases(HDMs),was proved to be involved in many human diseases,especially *** evidences indicates that it plays an important role in the formation of hormone-refractory prostate ***,the function of HMTs and HDTs in prostate cancer remains mostly *** study was carried out to systematically elucidate the function of HMTs and HDTs in prostatic ***:RNAi screening was performed to systematically screen human HMTs and *** cell viability was evaluated after 24 hours infection by ***-PCR and Western blot were performed to evaluate the positive genes expression in prostate epithelial cell line,benign prostate hyperplasia cell line and 4 prostate cancer cell *** expression of Bcl-2,Bak and caspase-3 was evaluated by Western blot after PRDM16 ***:9 positive genes(FBXO11,PRDM10,MLL,SETD4,PRMT2,MEN1,PRDM16,JMJD8,JMJD7)were obtained in RNAi screening,in which sPRDM16(an alternatively spliced form of PRDM16 lacking the PR domain)expression was abnormally up-regulated in PCa cell ***145 apoptosis could be up-regulate after PRDM16inhibition,which is related to the down-regulation of Bcl-2 expression,up-regulation of Bak and ***:The results demonstrate an important role of sPRDM16 in prostate cancer and suggest that sPRDM16 could be a novel cancer therapeutic target.

关键词： HMTs HDMs RNAi screening PRDM16/MEL1 sPRDM16/MEL1S

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

One Health Advances 2023年第1期1卷 175-183页

作者： Zhen Wang Qingzhi Liu Li mei Junlin Guo Xiaolong Gao Bi Zhang Chang Cai yipeng Sun Xiaoyu Feng Yongqiang Wang National Key Laboratory of Veterinary Public Health Security Key Laboratory for Prevention and Control of Avian Influenza and Other Major Poultry Diseases and Key Laboratory of Animal Epidemiology of Ministry of Agriculture and Rural AffairsCollege of Veterinary MedicineChina Agricultural UniversityBeijing 100193China State Key Laboratories of Agrobiotechnology Department of Microbiology and ImmunologyCollege of Biological ScienceChina Agricultural UniversityBeijing 100193China Department of Biostatistics University of Michigan-Ann ArborAnn ArborMI 48109USA Beijing Animal Disease Prevention and Control Center Beijing 100260China New Ruipeng Pet Group Inc Beijing 100000China College of Science HealthEngineering&EducationMurdoch UniversityPerthWA 6149Australia National Key Laboratory of Veterinary Public Health Security Microbiology and Immunology Department of Preventive Veterinary MedicineCollege of Veterinary MedicineChina Agricultural UniversityBeijing 100193China

Rabies is a serious public health problem in Asia and *** 99%of cases result from a bite by an infected *** high rabies risk countries are generally characterized by rapid urbanization;however,the prevalence and risk factors for rabies in urban dogs in developing countries remain ***,the capital of China,has been undergoing rapid urbanization,and implemented compulsory rabies immunization for dogs on October 1,*** evaluated the effects of this immunization policy and investigated the dynamics and determinants of the spread of dog rabies virus(RABV)in *** 2013 and 2018,the positive rate of rabies in biting dogs declined significantly;79.6%of these were stray *** spatiotemporal diffusion for RABV presents a more central distribution within Beijing and a surrounding dissemination of virus lineage toward suburban areas,indicating that rabies is self-sustaining in *** RABV phylogeographic reconstructions and logistic regression analysis of rabies cases revealed that rabies tended to remain in commercial areas,high-rise residences,demolition areas,and high-GDP,high-population and high-accessibility *** areas,where many residents have abandoned their pets,are recognized as high-risk areas for *** findings reveal that the implementation of the immunization policy in Beijing has been effective in prevention and control of canine rabies,and because the prevalence of canine rabies results from multiple factors,emphasize the important role of multi-sectoral cooperation in rabies prevention and control.

关键词： Rabies Urban areas Prevalence Risk factors