检索结果-南通市图书馆

High Voltage 2024年第1期9卷 56-65页

作者： Hao Hu Zhidong Jia xilin wang Ruiyang Guan Weinan Fan Simin Luo Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhenChina Guangzhou Power Supply China Southern Power Grid Company Ltd.GuangzhouChina

Silicone rubber(SR)is widely used for cable insulation and operates in multi-stress coupling *** dielectric properties and ageing performance are the essential factors affecting cable *** this study,the frequency domain spectroscopy of unaged SR and SR aged under various conditions is *** dielectric responses before and after ageing are analysed in depth by the conjoint analysis via multiple complex planes(permittivity,conductivity,and modulus).Typical conductivity and interfacial polarisation properties,as well as property changes resulting from thermal and tensile ageing,are *** results show that tensile ageing promotes conductance and interfacial polarisation,while thermal ageing shows the opposite *** on the multi-core model and charge carrier hopping transport model,thermal and tensile ageing mechanisms on the conductance and interfacial polarisation behaviours of SR are *** behaviours exhibit positively correlated changing characteristics,suggesting that the two behaviours may originate from a common *** carrier transport process,promoted by the tensile effect and slightly suppressed by the thermal effect,is the primary factor and considered an important indicator to evaluate the dielectric properties of SR insulation.

关键词： interfacial rubber insulation

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

基于激光诱导击穿光谱的硅橡胶胶含量检测

高电压技术 2024年第4期50卷 1684-1693页

作者：何永琪邓禹田亮王希林贾志东清华大学深圳国际研究生院深圳复杂滨海环境电力装备可靠性工程实验室深圳518055 中国电力科学研究院有限公司北京100192 西藏羊八井高海拔电气安全与电磁环境国家野外科学观测研究站西藏851517

硅橡胶胶含量不仅能够反映复合绝缘子的老化状态,而且可以反映其产品质量。测定胶含量对于复合绝缘子运维以及入网前的质量监测具有重要意义,但目前缺乏一种高效、准确的硅橡胶复合绝缘子胶含量现场原位检测手段。为此基于激光诱导击穿... 详细信息

硅橡胶胶含量不仅能够反映复合绝缘子的老化状态,而且可以反映其产品质量。测定胶含量对于复合绝缘子运维以及入网前的质量监测具有重要意义,但目前缺乏一种高效、准确的硅橡胶复合绝缘子胶含量现场原位检测手段。为此基于激光诱导击穿光谱技术,探究了硅橡胶胶含量的光谱表征手段。以11种不同配方的高温硫化硅橡胶样品为研究对象,分别建立了Al、Si原子谱线强度,等离子体温度以及Si离子原子谱线强度比与硅橡胶胶含量之间的线性定标模型,其中等离子体温度的拟合优度最高为0.9114,SiⅠ390.55 nm谱线强度的拟合优度最低为0.4857。最终,选取了AlⅠ394.40 nm、AlⅠ396.15 nm、SiⅠ390.55 nm谱线强度作为自变量,建立了胶含量的多元线性定标模型,预测结果拟合优度可达0.9884。

关键词：硅橡胶胶含量激光诱导击穿光谱多元线性回归定量分析

维普期刊数据库博看期刊

在线全文

学校读者我要写书评

暂无评论

光量子态的空域调控(特邀)

光学学报 2024年第10期44卷 151-170页

作者：刘志峰黄双印陈超任志成汪喜林王慧田南京大学固体微结构物理国家重点实验室南京大学物理学院江苏南京210093 人工微结构科学与技术协同创新中心江苏南京210093

从单光子的线性空域调控出发,依次阐述单光子空域编码与转换、双光子纠缠态的制备与测量、多光子的高维空域纠缠态的制备及其在量子信息中的应用。主要围绕多自由度操控和高维量子信息转换,从制备、编码、测量和应用等方面概述空域光量... 详细信息

从单光子的线性空域调控出发,依次阐述单光子空域编码与转换、双光子纠缠态的制备与测量、多光子的高维空域纠缠态的制备及其在量子信息中的应用。主要围绕多自由度操控和高维量子信息转换,从制备、编码、测量和应用等方面概述空域光量子态的研究进展。同时探讨了一些关键问题的可能解决方案。

关键词：量子光学量子信息量子纠缠高维量子纠缠多自由度纠缠

双相情感障碍患者攻击行为的列线图预测模型构建

在线全文

学校读者我要写书评

暂无评论

实用医学杂志 2024年第5期40卷 677-681页

作者：王西林杨婵娟程道猛广州医科大学附属脑科医院广州510370

目的探讨双相情感障碍患者攻击行为的影响因素,构建列线图预测模型。方法选择2021年3月至2023年4月本院收治的80例双相情感障碍患者作为研究对象,分为未攻击组和攻击组,对两组患者的资料进行单因素分析,并将有统计学意义的因素进行log... 详细信息

目的探讨双相情感障碍患者攻击行为的影响因素,构建列线图预测模型。方法选择2021年3月至2023年4月本院收治的80例双相情感障碍患者作为研究对象,分为未攻击组和攻击组,对两组患者的资料进行单因素分析,并将有统计学意义的因素进行logistic回归分析,绘制列线图,确定双相情感障碍患者攻击行为的影响因素。结果共纳入80例患者,其中28例患者为攻击组(35.0%),52例患者为未攻击组(65.0%)。攻击组患者长期独居的占比、总住院时间、既往有自杀倾向的占比均高于未攻击组,且ITAQ、SSRS的评分均低于未攻击组(P <0.05)。多因素logistic回归分析显示长期独居、既往有自杀倾向为双相情感障碍患者攻击行为的危险因素,ITAQ与SSRS的高评分为双相情感障碍患者攻击行为的保护因素(P <0.05),并构建列线图,有良好预测价值。结论患者的长期独居、既往有自杀倾向可能会增加双相情感障碍患者出现攻击行为的风险。

关键词：双相情感障碍攻击行为危险因素列线图

少年精神障碍住院患者心理剧治疗效果的定性研究

在线全文

学校读者我要写书评

暂无评论

中国心理卫生杂志 2024年第3期38卷 213-217页

作者：刘彦茹王希林刘华清张晓鸣王志仁北京回龙观医院北京100096 北京大学第六医院北京大学精神卫生研究所国家卫生健康委员会精神卫生学重点实验室(北京大学)国家精神心理疾病临床医学研究中心(北京大学第六医院)北京100083

目的:探讨心理剧治疗对少年精神障碍住院患者的效果。方法:在某医院住院儿童病房招募精神障碍患者22例(年龄12~18岁),根据访谈提纲对连续参加4次心理剧治疗的患者(均按常规服用精神科药物)进行半结构式访谈,采用扎根理论的方法对访谈资... 详细信息

目的:探讨心理剧治疗对少年精神障碍住院患者的效果。方法:在某医院住院儿童病房招募精神障碍患者22例(年龄12~18岁),根据访谈提纲对连续参加4次心理剧治疗的患者(均按常规服用精神科药物)进行半结构式访谈,采用扎根理论的方法对访谈资料进行深度分析,采用自编心理剧治疗参与感受及评价调查表调查患者参加心理剧治疗后的感受、收获或变化。结果:访谈分析发现,心理剧治疗的效果包括减轻症状、提高自尊程度、促进功能康复和提高社会适应能力4个方面。自编心理剧治疗参与感受及评价调查表结果显示,排名前4位的是促进人际关系、有趣、愿意继续参加和提高自信。结论:心理剧治疗对少年精神障碍住院患者具有辅助治疗作用,可促进自尊水平和社交能力的提升。

关键词：扎根理论心理剧治疗精神障碍少年

先进绝缘材料电场辅助性能调控及制备研究进展

在线全文

学校读者我要写书评

暂无评论

中国电机工程学报 2024年第2期44卷 790-804,I0030页

作者：申子魁周濛贾志东郝艳捧李越纪王希林黄逸蒙华南理工大学电力学院广东省广州市510641 清华大学深圳国际研究生院广东省深圳市518055

电工材料作为电工装备的基础,其特性直接决定极限运行参数,开发具有新功能、高性能的先进电工材料有助于电工装备挑战更高参数极限。受学科发展战略引导、重大科学问题启发,该文从电场辅助制备的物理机制、几类典型绝缘材料性能调控及... 详细信息

电工材料作为电工装备的基础,其特性直接决定极限运行参数,开发具有新功能、高性能的先进电工材料有助于电工装备挑战更高参数极限。受学科发展战略引导、重大科学问题启发,该文从电场辅助制备的物理机制、几类典型绝缘材料性能调控及制备机理等方面综述了电场辅助先进绝缘材料性能调控及制备的研究进展。首先,总结电场辅助制备电工材料的物理理论,详细阐述电泳、介电泳、自组装等机械效应和焦耳热、弛豫损耗等能量效应的机理。其次,以机械效应为主探讨电场辅助在以智能绝缘材料、导热绝缘材料、高密度储能材料、纤维增强材料和介电功能梯度材料为代表的先进绝缘材料性能调控领域的应用现状;以能量效应为主探讨电场辅助在热塑(固)性聚合物熔融(固化)、功能陶瓷快速烧结领域的研究进展。最后,对先进绝缘材料电场辅助性能调控及制备研究趋势进行展望,可为革新电工材料制造工艺、开拓传统高电压学科研究新方向提供一定理论参考。

关键词：电场辅助先进绝缘材料复合材料陶瓷材料机械效应能量效应

Large eddy simulation of a 3-D spatially developing turbulent round jet

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

Science China(Technological Sciences) 2011年第11期54卷 2916-2923页

作者： ZHANG HuiQiang RONG Yi wang Bing wang xilin School of Aerospace Tsinghua University Beijing 100084 China

A three-dimensional large eddy simulation （LES） of a spatially developing round jet is carried out in cylindrical coordinates using a dynamic subgrid model with strong inflow instability. Evolutions of large-scale vortex structures represented by tangential vortices are obtained and compared with flow visualization. Also presented are three-dimensional spatial evolutions of coherent structure, which are of quasi two-dimensional Kelvin-Helmholtz instability and vortex rings as well as breaking up of the vortex rings with fully three-dimensional characteristics. Predicted results of mean velocity and turbulent intensity agree well with experiments. They are also compared with the results predicted by LES using standard Smagorinsky model and show good self-similarity. Turbulence spectrum of the predicted velocity shows the -5/3 decay for higher wave number, as expected for turbulent round jet flows. In addition, fl-test and y-test are carded out for the instantaneous velocity, showing that the present LES method can successfully predict the hierarchical structure of round jet.

关键词： large eddy simulation round jet spatially developing flow large-scale structure hierarchical structure

Large Eddy Simulation of a dilute particleladen turbulent flow over a backwardfacing step

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2008年第11期51卷 1957-1970页

作者： ZHANG HuiQiang wang Bing CHAN CheongKi wang xilin Department of Engineering Mechanics Tsinghua UniversityBeijing 100084China Department of Applied Mathematics Hong Kong Polytechnic UniversityHong KongChina

Dilute gas-particle turbulent flows over a backward-facing step are numerically simulated by Large Eddy Simulation (LES) for the continuous phase and Lagran- gian particle trajectory method for the particle phase. Predicted results of mean velocities and fluctuating velocities of both phases agree well with the experimental data, and demonstrate that the main characteristics of the flow are accurately captured by the simulations. Characteristics of separation and reattachments as well as essential features of the coherent structure are obtained, in which the processes of vortex roll up, growth, pairing and breaking up are shown in details. Particle dispersions are then investigated through particles’ instantaneous distri- butions in coherent structure as well as the mean and fluctuating properties of particle number density (PND). The predicted mean PND agree well with experiment results. For small particles, the instantaneous distributions show much preferential concentration, while their mean PND shows more uniform distribution in down- stream region. On the contrary, for large particles, their instantaneous distributions are much uniform (without clear preferential concentration) due to less effect of large eddy coherent, while their mean PND across the section is not uniform for more particles are distributed in the main flow region. The preferential concentra- tion of particles by the large-scale eddies can lead to a high fluctuating PND.

关键词： two-phase flow particle dispersion Large Eddy Simulation backward-facing step flow spatially developing flow particle number density

Transports of air particulate matters in the atmospheric boundary layer-numerical studies using Eulerian and Lagrangian methods

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2013年第3期56卷 645-650页

作者： LU Hao wang Bing ZHANG HuiQiang wang xilin School of Aerospace Tsinghua University The State of Key Laboratory of Nonlinear Mechanics

Transports of air particulate matters(PM) from face sources in the atmospheric boundary layer(ABL) are investigated by the Eulerian single fluid model and the Lagrangian trajectory method,*** eddy simulation is used to simulate the fluid phase for high accuracy in both two *** mean and fluctuating PM concentrations,as well as instantaneous PM distributions at different downstream and height positions,are *** mean and fluctuating particle concentrations are predicted by the Eulerian approach than the Lagrangian *** the Lagrangian method,PM distributions cluster near the ground-wall because of the preferential dispersion of inertial particles by turbulence structures in the ABL,while it cannot be obtained by the Eulerian single fluid method,because the two-phase velocity differences are neglected in the Eulerian method.

关键词： air pollution atmosphere boundary layer large eddy simulation Eulerian method Lagrangian method

Dense gas-particle flow in vertical channel by multi-lattice trajectory model

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2012年第2期55卷 542-554页

作者： ZHANG HuiQiang LIU Min wang Bing wang xilin School of Aerospace Tsinghua UniversityBeijing 100084China

A multi-lattice deterministic trajectory(MLDT) model is developed to simulate dense gas-particle flow in a vertical *** actual inter-particle collision and particle motion are treated by a Lagrangian model with three sets of lattices to reduce computational *** formation and motion near the wall are successfully predicted with mean particle volume fraction and velocity,showing quantitatively agreement with experimental *** mechanism of particles concentrated near the wall is investigated by considering effects of gravity,particle-wall collisions,inter-particle collisions and velocity profiles of the gas *** is shown that the inter-particle collision and gas-phase velocity distribution are the essential factors for cluster formation near the wall,while gravity and particle-wall collision only have minor effects on particle concentration near the *** are unable to remain in the high velocity region due to the strong inter-particle collisions,while they tend to stay in the low velocity region for weak inter-particle *** addition,the effects of channel width and particle sizes on cluster formation are also investigated and it is found that particle concentration near the wall reduces with the decrease of channel width and increase of particle size.

关键词： multi-lattice deterministic trajectory (MLDT) model dense gas-particle channel flow core-annular regime clusterformation