检索结果-南通市图书馆

Dividing and setting strategy of improving calculation efficiency for needle electrode corona discharge with a large-scale space

引用

High Voltage 2022年第3期7卷 429-438页

作者： dingchen li Chuan li Jiawei li Pengyu Wang Zhi liu Wendi Yang Ming Zhang Yong Yang Kexun Yu International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical Engineering and ElectronicsHuazhong University of Science and TechnologyWuhanChina Digital Grid Research Institute of China Southern Power Grid GuangzhouChina Zhuzhou CRRC Times Electric Co. Ltd.(TEC)ZhuzhouChina

Needle electrodes are widely used in the research of corona discharge.Aiming at the problem of needle electrode discharge in a large-scale space(tens or even hundreds of centimetres),a hybrid model was proposed in the previous work.However,its indis-pensable multiple iterations result in huge computation and further limit its wide appli-cations.Therefore,a strategy to improve the computing efficiency by setting initial values in different computational domains is put forward in this work.Three types of setting initial values(global constant,partition constant and partition exponent)are simulated and compared in detail.The calculation results show that the calculation efficiency can be increased by 1.4 times simply through setting initial values of charged particles as different constants for the divided subdomains,and further be improved by 4.3 times by setting those in the ionization region as an exponential distribution.The extension of the pro-posed strategy has also been discussed under various voltages,which shows that the results under other voltages can be quickly obtained based on the fitted coefficients under a specific voltage,and the improvement can reach up to 10 times.The accuracy of calculated results has been demonstrated by a needle-plate electrode device with a vertical distance of 25 cm.This research provides an effective strategy for improving the computing efficiency of corona discharge in a large-scale space,and implies the potential in optimizing the analyses of complex electrodes.

关键词： electrode calculation partition

来源：

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

基于神经网络和多目标优化算法的掺铋光纤放大器设计

引用

光学学报 2024年第2期44卷 112-119页

作者：侯文强裴丽王建帅郑晶晶徐文轩田梓辰王丁辰王丽红李晶宁提纲北京交通大学电子信息工程学院北京100044 北京交通大学光波技术研究所全光网络与现代通信网教育部重点实验室北京100044

掺铋光纤放大器有助于将光纤通信系统拓展至新的传输波段。然而,其增益和噪声性能存在相互制约的关系,提升增益往往会导致噪声性能的恶化,反之亦然。因此,提出一种结合反向传播神经网络(BPNN)和带精英保留策略的快速非支配排序遗传算法(... 详细信息

掺铋光纤放大器有助于将光纤通信系统拓展至新的传输波段。然而,其增益和噪声性能存在相互制约的关系,提升增益往往会导致噪声性能的恶化,反之亦然。因此,提出一种结合反向传播神经网络(BPNN)和带精英保留策略的快速非支配排序遗传算法(NSGA-Ⅱ)的多目标优化方法,通过对两级掺铋光纤放大器结构进行设计,实现了增益和噪声性能的同时优化。使用经过训练的BPNN对增益和噪声系数预测的均方根误差分别为0.191和0.084,具有较高预测精度。以高增益和低噪声系数为目标,使用NSGA-Ⅱ算法进行优化,得到包含500个解的Pareto最优解集。优化后,放大器所能实现的平均增益范围为15~37 d B,相应的平均噪声系数范围为4.95~5.31 d B。利用BPNN代替求解耦合微分方程来评价个体适应度,使得优化时间较传统方法由106s左右降低为80 s左右,大幅提升了优化效率。所提方法也为其他掺杂光纤放大器的高效率、多目标结构优化设计提供了一种新的思路。

关键词：光纤通信掺铋光纤放大器反向传播神经网络多目标优化带精英保留策略的快速非支配排序遗传算法

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

General trends of protein expression and localization reveal the rule of bio-complexity realization

General trends of protein expression and localization reveal...

引用

第五届全国生物信息学与系统生物学学术大会暨国际生物信息...

作者：杨冬 dingchen li Fan Zhong Dong li Ying Jiang Fuchu He State Key Laboratory of Proteomics Beijing Proteome Research CenterBeijing Institute of Radiation Medicine Institutes of Biomedical Sciences and Department of Chemistry Fudan University

Background:During evolution,proteins containing newly emerged domains and the increasing proportion of multi-domain proteins in the full Genome-Encoded Proteome(GEP) have substantially contributed to increasing biological complexity.However,it is not known how these two potential structural factors are preferentially utilized at given physiological states,until our most recent study found that multidomain proteins or only older domain- containing proteins are significantly overrepresented in certain-state proteomes(CSPs,i.e., all the proteins expressed at certain physiological states) compared with GEP,which indicates biological complexity under certain conditions is more significantly realized by diverse domain organization than by the emergence of new types of domain.To further explore the regular utilization pattern in the view of protein spatial distribution at levels ranging from organelles to organs,we investigated the relationships between protein domain characters and protein subcelluar localization width(SLW) or tissue specificity(TS). Methods:To calculate SLW,we collected high confident subcellular location information in Swiss-Prot,GOA,human protein atlas(HPA),MitoP2,Human liver Organelle Proteome(HLOP) and related references and references.Domain identification is based on RPS-BLAST against Pfam and SMART(Elization information with high confidence of more than 13000 human proteins,including the subcellular locations for different splice isoforms as complete as possible.Based on this atlas,we found that SLW positively correlates with DN value,while it negatively correlates with DA value,that is, multi-domain proteins or only older domain-containing proteins tend to be localized at more subcellular components.In addition,SLW negatively correlate with TS,i.***.proteins with more subcellular locations tend to be expressed widely across OTCs.The ab

关键词： Biological complexity protein domain proteome subcellular localization tissue specificity

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

A consensus linkage map of common carp (Cyprinus carpio L.) to compare the distribution and variation of QTLs associated with growth traits

引用

Science China(life Sciences) 2013年第4期56卷 351-359页

作者： ZHENG XianHu KUANG YouYi LV WeiHua CAO dingchen ZHANG XiaoFeng li Chao LU CuiYun SUN XiaoWen Heilongjiang River Fisheries Research Institute Chinese Academy of Fishery Sciences College of Fisheries and life Science Shanghai Ocean University

The ability to detect and identify quantitative trait loci (QTLs) in a single population is often limited. Analyzing multiple populations in QTL analysis improves the power of detecting QTLs and provides a better understanding of their functional allelic variation and distribution. In this study, a consensus map of the common carp was constructed, based on four populations, to compare the distribution and variation of QTLs. The consensus map spans 2371.6 cM across the 42 linkage groups and comprises 257 microsatellites and 421 SNPs, with a mean marker interval of 3.7 cM/marker. Sixty-seven QTLs affecting four growth traits from the four populations were mapped to the consensus map. Only one QTL was common to three populations, and nine QTLs were detected in two populations. However, no QTL was common to all four populations. The results of the QTL comparison suggest that the QTLs are responsible for the phenotypic variability observed for these traits in a broad array of common carp germplasms. The study also reveals the different genetic performances between major and minor genes in different populations.

关键词： QTLs 生长性状遗传连锁图谱鲤鱼等位基因变异 QTL检测协商数量性状座位

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

病原真菌基因组流行病学研究进展

引用

中华流行病学杂志 2022年第6期43卷 981-986页

作者：钟涵莹李定辰陈芳艳赵静雅许蕊韩黎中国人民解放军疾病预防控制中心北京100071 中国医科大学公共卫生学院沈阳110122

基因组流行病学研究为病原真菌的遗传进化、传播和表型研究提供了新的视角,其核心技术是全基因组测序技术和生物信息学分析,极大地弥补了传统分子分型技术的不足。通过将病原真菌的全部遗传信息和流行病学调查相结合,能够预测病原真菌... 详细信息

基因组流行病学研究为病原真菌的遗传进化、传播和表型研究提供了新的视角,其核心技术是全基因组测序技术和生物信息学分析,极大地弥补了传统分子分型技术的不足。通过将病原真菌的全部遗传信息和流行病学调查相结合,能够预测病原真菌的传播途径和传播风险,为制定真菌防控的公共卫生策略提供理论基础。本文将对分子流行病学、基因组流行病学的发展以及基因组流行病学在病原真菌的遗传关系、溯源及进化、耐药性以及毒力、全基因组关联分析等方面的应用进行综述,并对病原真菌基因组流行病学未来发展做出展望。

关键词：基因组流行病学病原真菌全基因组测序全基因组关联分析

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Study on the interaction mechanism of double-blade corona discharge with a large discharge gap

引用

Plasma Science and Technology 2023年第4期25卷 101-110页

作者：李丁晨李传李家玮杨文迪肖梦涵张明于克训 International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical Engineering and ElectronicsHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China

Multi-source corona discharge is a commonly used method to generate more charged particles,but the interaction mechanism between multiple discharge sources,which largely determines the overall discharge effect,has still not been studied much.In this work,a large-space hybrid model based on a hydrodynamic model and ion-transport model is adopted to study the interaction mechanism between discharge sources.Specifically,the effects of the number of electrodes,voltage level,and electrode spacing on the discharge characteristics are studied by taking a double-blade electrode as an example.The calculation results show that,when multiple discharge electrodes operate simultaneously,the superimposed electric field includes multiple components from the electrodes,making the ion distribution and current different from that under a single-blade electrode.The larger the distance between discharge electrodes,the weaker the interaction.When the electrode spacing d is larger than 4 cm,the interaction can be ignored.The results can guide the design of large discharge gap array electrodes to achieve efficient discharge.

关键词： non-equilibrium plasma corona discharge double-blade electrode interaction numerical simulation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Multi-point discharge model: study on corona discharge of double-ended needle in large space

引用

Plasma Science and Technology 2023年第3期25卷 62-69页

作者：李丁晨李家玮李传张明王鹏宇刘志杨勇于克训 International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical Engineering and ElectronicsHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical Engineering and ElectronicsHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China Digital Grid Research Institute China Southern Power GridGuangzhou 510670People’s Republic of China The Fifth Bureau of China State Construction Engineering Corporation Changsha 410000People’s Republic of China

Corona discharge, as a common means to obtain non-equilibrium plasma, can generally obtain high-concentration plasma by increasing discharge points to meet production needs. However,the existing numerical simulation models used to study multi-point corona discharge are all calculations of small-scale space models, which cannot obtain the distribution characteristics of plasma in large space. Based on our previous research, this paper proposes a hybrid model for studying the distribution of multi-point discharge plasma in large-scale spaces, which divides the computational domain and computes separately with the hydrodynamic model and the ion mobility model. The simulation results are verified by a needle–ball electrode device. Firstly, the electric field distribution and plasma distribution of the needle electrodes with single tip and double tips are compared and discussed. Secondly, the plasma distribution of the needle electrode with the double tip at different voltages is investigated. Both computational and experimental results indicate that the charged particle concentration and current of the needle electrode with double tips are both twice as high as those of the needle electrode with a single tip. This model can extend the computational area of the multi-point corona discharge finite element model to the sub-meter(25 cm) or meter level, which provides an effective means to study the plasma distribution generated by multiple discharge points in large-scale space.

关键词： corona discharge numerical simulation multi-point discharge large space double needle tip electrode

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Efficient direction-independent fog harvesting using a corona discharge device with a multi-electrode structure

引用

Plasma Science and Technology 2022年第9期24卷 98-107页

作者：李丁晨李传李家玮杨文迪肖梦涵张明杨勇于克训 International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical Engineering and ElectronicsHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical Engineering and ElectronicsHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China

Efflcient collection of water from fog can effectively alleviate the problem of water shortages in foggy but water-scarce areas,such as deserts,islands and so on.Unlike inefflcient fog meshes,corona discharge can charge water droplets and further enhance the water-collecting effect.This study proposes a novel multi-electrode collecting structure that can achieve efflcient and direction-independent water collection from fog.The multi-electrode structure consists of three parts:a charging electrode,an intercepting electrode and a ground electrode.Four types of watercollecting structures are compared experimentally,and the collection rates from a traditional fog mesh,a wire-mesh electrode with fog coming from a high-voltage electrode,a wire-mesh electrode with fog coming from a ground electrode and a multi-electrode structure are 2–3 g h^(-1),100–120 g h^(-1),60–80 g h^(-1)and 200–220 g h^(-1),respectively.The collection rate of the multielectrode structure is 100–150 times that of a traditional fog mesh and 2–4 times that of a wiremesh electrode.These results demonstrate the superiority of the multi-electrode structure in fog collection.In addition,the motion equation of charged droplets in an electric fleld is also derived,and the optimization strategy of electrode spacing is also discussed.This structure can be applied not only to fog collection,but also to air puriflcation,factory waste gas treatment and other flelds.

关键词： fog collection corona discharge wire-mesh electrode multi-electrode structure collection rate

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

贵州大厂茶珍稀濒危种质资源研究及保护进展

引用

科技导报 2023年第4期41卷 58-64页

作者：白鼎臣何立敏李彩云牛素贞贵州大学茶学院贵阳550025 贵州大学农业生物工程研究院贵阳550025

分析了濒危资源大厂茶研究及保护现状,结果显示,贵州大厂茶主要分布在12个县,形态特征与栽培种存在显著差异,可溶性果胶含量较高,儿茶素组分含量也与栽培种存在较大差异,说明大厂茶种质资源具有新型品种选育的潜力。大厂茶中含量较高的... 详细信息

分析了濒危资源大厂茶研究及保护现状,结果显示,贵州大厂茶主要分布在12个县,形态特征与栽培种存在显著差异,可溶性果胶含量较高,儿茶素组分含量也与栽培种存在较大差异,说明大厂茶种质资源具有新型品种选育的潜力。大厂茶中含量较高的儿茶素组分ECG(表儿茶素没食子酸酯)与DFR基因显著正相关,挖掘了5个DFR基因的转录因子。检测到8个大厂茶抗虫因子关联单核苷酸多态性(Single Nucleotide Polymorphisms,SNPs)和6个系统获得性抗性(SAR)负调节因子的AtMPK4基因。表明大厂茶作为一种特异的茶树种质资源具有巨大的保护价值和开发潜力。

关键词：贵州大厂茶珍稀濒危种质资源

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

焊接电压对绝缘铜线微电阻热压焊接头的影响

引用

焊接学报 2022年第3期43卷 44-49,62,I0005,I0006页

作者：李远波温嵩杰杜鼎臣崔志远彭梓林广东工业大学省部共建精密电子制造技术与装备国家重点实验室广州510006 广东工业大学广州市非传统制造技术及装备重点实验室广州510006

采用微电阻热压焊工艺来焊接耐高温微细绝缘铜线,研究了不同焊接电压下接头的外观形貌、截面微观组织、拉断力和形成过程.结果表明,当焊接时间为20 ms、电极压力为12 N、焊接电压大于2.05 V时,该工艺可在一个输出脉冲内完成绝缘铜线的... 详细信息

采用微电阻热压焊工艺来焊接耐高温微细绝缘铜线,研究了不同焊接电压下接头的外观形貌、截面微观组织、拉断力和形成过程.结果表明,当焊接时间为20 ms、电极压力为12 N、焊接电压大于2.05 V时,该工艺可在一个输出脉冲内完成绝缘铜线的除漆和焊接,无需预先除漆.随着焊接电压的增加,接头长度基本不发生变化,接头宽度和拉断力一直增大;接头失效形式依次表现为界面剥离、前端断裂和中部断裂.接头的演变过程包括预压塑性变形、接头弱连接、热辅助下的压陷、接头强连接和熔融金属挤出5个阶段.

关键词：微电阻热压焊耐高温微细绝缘铜线接头演变断裂模式

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：