检索结果-南通市图书馆

Evaluation of lightning-induced overvoltage on a 10 kV distribution line based on electromagnetic return-stroke model using finite-difference time-domain

引用

High Voltage 2024年第2期9卷 356-366页

作者： Pan Duan Lianfang Zhang xiaogang huang Jian Sun Yue Qi Qing Yang School of Automation Chongqing University of Posts and TelecommunicationsChongqingChina Chongqing Power Co Tongnan BurChongqingChina China Southern Power Grid Science Research Institute GuangzhouChina State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqingChina

Accurate simulation of lightning-induced overvoltage for overhead distribution lines is helpful to prevent lightning trip accidents.An electromagnetic return-stroke model was used to represent lightning and then a 3D finite-difference time-domain(FDTD)method was adopted to simulate the lightning-induced overvoltage on a distribution line without a field-line coupling model.How lightning-induced overvoltage behave for different ground conductivity and varying distance between the distribution line and the lightning channel was analysed.The results showed that the overvoltage waveforms at the centre point of the line corresponding to lightning strikes on the lossy ground and an ideal ground(σ=∞)were similar;however,the peak amplitudes of the waveform were affected by soil conductivity at a close distance.The relationship between magnitude of the overvoltage and distance can be described by a second-order exponential decay equation.Finally,the overvoltage calculated using the proposed model was compared with those obtained based on Agrawal's model and measurements made using the newly developed intelligent insulator on site.From these comparisons,it could be concluded that the FDTD method with the electromagnetic return-stroke model produces reasonably accurate results of the attenuated oscillation waveform,which can better reproduce the overvoltage on operational distribution lines.

关键词： lightning distribution return

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

Dual-filler reinforced PVDF-HFP based polymer electrolyte enabling high-safety design of lithium metal batteries

引用

Nano Research 2024年第6期17卷 5251-5260页

作者： Chang Fang Kangsheng huang Jing Zhao Shiqi Tian Hui Dou xiaogang Zhang Jiangsu Key Laboratory of Electrochemical Energy Storage Technologies College of Materials Science and TechnologyNanjing University of Aeronautics and AstronauticsNanjing 210016China

Despite the high energy density of lithium metal batteries(LMBs),their application in rechargeable batteries is still hampered due to insufficient safety.Here,we present a novel flame-retardant solid-state electrolyte based on polyvinylidene fluoride-hexafluoropropylene(PVDF-HFP)with nano SiO_(2)aerogel as an inert filler but Li_(6.4)La_(3)Zr_(1.4)Ta_(0.6)O_(12)(LLZTO)as an auxiliary component to enhance the ion conductivity.The introduction of SiO_(2)aerogels imparts the polymer electrolyte with exceptional thermal stability and flame retardancy.Simultaneously,the interaction between hydroxyl groups of SiO_(2)particles and PVDF-HFP creates a strong cross-linking structure,enhancing the mechanical strength and stability of the electrolyte.Furthermore,the presence of SiO_(2)aerogel and LLZTO facilitates the dissociation of lithium salts through Lewis acid-base interactions,resulting in a high ionic conductivity of 1.01×10^(−3)S·cm^(−1)and a wide electrochemical window of~5.0 V at room temperature for the prepared electrolytes.Remarkably,the assembled Li|Li cell demonstrates the excellent resistance to lithium dendrite and runs stablly for over 1500 h at a current density of 0.25 mA·cm^(−2).Thus,we prepare a pouch cell with high safety,which can work normally after short-circuiting under the external folding and cutting.

关键词： polymer electrolyte SiO_(2)/Li_(6.4)La_(3)Zr_(1.4)Ta_(0.6)O_(12)(LLZTO)dual-filler non-flammable long cycle life lithium metal battery

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

Enhancing multifunctional photocatalysis with acetate-assisted cesium doping and unlocking the potential of Z-scheme solar water splitting

引用

Carbon Energy 2024年第3期6卷 178-195页

作者： Mengmeng Ma Jingzhen Li xiaogang Zhu Kong Liu Kaige huang Guodong Yuan Shizhong Yue Zhijie Wang Shengchun Qu Key Laboratory of Semiconductor Materials Science Beijing Key Laboratory of Low Dimensional Semiconductor Materials and DevicesInstitute of SemiconductorsChinese Academy of SciencesBeijingChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina Department of Physics College of Physical Science and TechnologyXiamen UniversityXiamenChina State Key Laboratory for Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijingChina

Graphitic carbon nitride(g-C_(3)N_(4))has been extensively doped with alkali metals to enlarge photocatalytic output,in which cesium(Cs)doping is predicted to be the most efficient.Nevertheless,the sluggish diffusion and doping kinetics of precursors with high melting points,along with imprecise regulation,have raised the debate on whether Cs doping could make sense.For this matter,we attempt to confirm the positive effects of Cs doping on multifunctional photocatalysis by first using cesium acetate with the character of easy manipulation.The optimized Csdoped g-C_(3)N_(4)(CCN)shows a 41.6-fold increase in visible-light-driven hydrogen evolution reaction(HER)compared to pure g-C_(3)N_(4) and impressive degradation capability,especially with 77%refractory tetracycline and almost 100%rhodamine B degradedwithin an hour.The penetration ofCs+is demonstrated to be a mode of interlayer doping,and Cs–N bonds(especially with sp^(2) pyridine N in C═N–C),along with robust chemical interaction and electron exchange,are fabricated.This atomic configuration triggers the broadened spectral response,the improved charge migration,and the activated photocatalytic capacity.Furthermore,we evaluate the CCN/cadmium sulfide hybrid as a Z-scheme configuration,promoting the visible HER yield to 9.02 mmol g^(−1) h^(−1),which is the highest ever reported among all CCN systems.This work adds to the rapidly expanding field of manipulation strategies and supports further development of mediating served for photocatalysis.

关键词： acetate-assisted cesium doping multifunctional photocatalysis Z-scheme

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

Analysis of the Winter Cloud-to-Ground Lightning Activity and Its Synoptic Background in China during 2010-20

引用

Advances in Atmospheric Sciences 2022年第6期39卷 985-998页

作者： Manman MA xiaogang huang Jianfang FEI Chi ZHANG Chao LI Xiaoping CHENG College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China Unit 94116 of PLA Hetian 848000China Jiangsu Meteorological Observatory Nanjing 210008China

Cloud-to-ground(CG)lightning data and the ECMWF ERA-Interim reanalysis dataset are analyzed to gain insight into the spatiotemporal distribution and synoptic background of winter-season CG flashes between December 2010 and February 2020 in China.We identify three Winter Lightning Frequent Areas(WLAs):the southwest side of the Yunnan-Guizhou Plateau(WLA1),the east side of the Yunnan-Guizhou Plateau(WLA2),and the Poyang Lake Plain(WLA3).The CG lightning flashes most frequently occur at local midnight and have a monthly peak in February.The CG lightning in WLA1 is mostly generated in non-frontal weather;however,the lightning in WLA2 and WLA3 mostly occurs in frontal systems.The frontal circulation situation is divided into four typical types:transversal trough after high pressure,low vortex,confrontational convergence,and asymptotic convergence.In all typical weather patterns,the lightning occurs downstream of a 500 hPa trough and is accompanied by a southwesterly low-level jet.The convective parameters of winter thunderstorms differ greatly from those of summer thunderstorms.The maximum convective available potential energy(MCAPE)and K-index(KI)are more useful metrics than convective available potential energy(CAPE)and Showalter index(SI)during winter.This study further deepens the understanding of the distribution characteristics of winter CG lightning in China,which motivates further research to improve the ability of winter thunderstorm prediction.

关键词： winter thunderstorms CG lightning spatiotemporal characteristics ADTD

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

Numerical studies for plasmas of a linear plasma device HIT-PSI with geometry modified SOLPS-ITER

引用

Chinese Physics B 2024年第3期33卷 503-508页

作者：王敏聂秋月黄韬王晓钢张彦杰 School of Physics Harbin Institute of TechnologyHarbin 150001China School of Electrical Engineering and Automation Harbin Institute of TechnologyHarbin 150001China Laboratory for Space Environment and Physical Sciences Harbin Institute of TechnologyHarbin 150001China MOE (Ministry of Education) Key Laboratory of Materials Modification by Laser Ionand Electron BeamsSchool of PhysicsDalian Institute of TechnologyDalian 116024China

The HIT-PSI is a linear plasma device built for physically simulating the high heat flux environment of future reactor divertors to test/develop advanced target plate materials.In this study,the geometry-modified SOLPS-ITER program is employed to examine the effects of the magnetic field strength and neutral pressure in the device on the heat flux experienced by the target plate of the HIT-PSI device.The findings of the numerical simulation indicate a positive correlation between the magnetic field strength and the heat flux density.Conversely,there is a negative correlation observed between the heat flux density and the neutral pressure.When the magnetic field strength at the axis exceeds 1 tesla and the neutral pressure falls below 10 Pa,the HIT-PSI has the capability to attain a heat flux of 10 MW·m-2 at the target plate.The simulation results offer a valuable point of reference for subsequent experiments at HIT-PSI.

关键词： HIT-PSI heat flux linear plasma SOLPS-ITER device

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

Mature typhoon “cloud gyro” model and numerical simulation study

引用

Science China Earth Sciences 2020年第5期63卷 749-756页

作者： xiaogang huang Xiangcheng LI Xiaoping CHENG Chenxi ZHANG Juli DING College of Meteorology and Oceanography National University of Defense TechnologyNanjing 211101China PLA Troop 92664 Haiyang 265100China

Due to the coarse temporal resolution of the best track databases for typhoons,some small-scale characteristics of typhoon motion have been neglected.In order to reveal the fine features of typhoon motion,the dense cloud within the radius of maximum wind(RMW)of mature typhoons,defined as a“cloud gyro”that simultaneously spins around its own rotational axis and precesses around the vertical axis,is approximated to a rigid body.Based on the principles of gyrodynamics,the derived mathematical model of a typhoon track indicates that typhoon movement is composed of translational motion governed by the steering flow and superimposed precessional motion that manifests as the inherent characteristics of typhoon tracks,especially with the external torque.High temporal resolution numerical simulation of a real case verifies the conclusion of this study,which is that the smaller the RMW,the larger the tangential wind speed or the larger the external torque,and the more obviously precessional motion manifests.

关键词： Mature typhoon Cloud gyro Precession angular velocity

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

Direct/indirect effects of aerosols and their separate contributions to Typhoon Lupit(2009):Eyewall versus peripheral rainbands

引用

Science China Earth Sciences 2021年第12期64卷 2113-2128页

作者： Zhichao LIANG Juli DING Jianfang FEI Xiaoping CHENG xiaogang huang College of Meteorology and Oceanography National University of Defense TechnologyNanjing211101China PLA Troop 96746 Korla841000China

As a typhoon approaches the continent,the position where anthropogenic aerosols penetrate,the convection competition between the eyewall and peripheral rainbands,and the separate contributions of direct aerosol-radiation interactions(ARI)and indirect aerosol-cloud interactions(ACI),yield uncertainties in the convection intensification area and hence the typhoon intensity.Typhoon Lupit(2009)was simulated using the Weather Research and Forecasting Model with Chemistry(WRF-Chem)to investigate and isolate the direct and indirect effects of aerosols on the intensity,convection,and precipitation of the typhoon.Three simulations(CTL,CLEAN,and CTLARIOFF)were designed,representing a polluted case(CTL,considering the ingestion of anthropogenic aerosols with ARI and ACI),a clean maritime case(CLEAN,mainly with sea salt aerosols),and a polluted case without aerosol radiative forcing(CTLARIOFF,as per CTL but without ARI).The results showed that anthropogenic aerosols could penetrate into both the peripheral rainbands and the eyewall when the typhoon was approaching the Asian continent.Owing to the representation of the real aerosol scenario,the simulated typhoon intensity weakened and was closer to observed values in the CTL experiment.The ARI dominated over ACI with the opposite effects.Specifically,the ACI mainly enhanced the formation of ice-phase hydrometeors within the upper level of the eyewall with more freezing latent heat releases,leading to an invigoration of eyewall convection.These excess ice-phase particles melted after they descended into the warm layer below the 0°C level,which accelerated the accretion of cloud droplets by raindrops(Pcacr)and hence the mixed phase precipitation process in the eyewall.The dynamic feedback induced by the ACI enhanced the boundary layer inflow and the upper layer outflow,supporting the maintenance of strong eyewall convection and intensification of the typhoon.Inversely,the ARI heated the distant periphery low-level atmosphere at an altitude of 1-2 km by the absorbing polluted ae

关键词： Aerosol Tropical cyclone Eyewall Peripheral rainbands WRF-Chem

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

特色文化产业赋能中国式乡村现代化——基于鹤庆县的考察

引用

云南民族大学学报（哲学社会科学版） 2024年第3期41卷 70-77页

作者：范建华黄小刚华中师范大学国家文化产业研究中心湖北武汉430079 贵州民族大学乡村振兴研究中心贵州贵阳550025

中国式现代化是中国共产党领导的、有别于西方的社会主义现代化。特色文化产业是实现乡村全面振兴的有力支撑,是实现“第二个结合”的重要突破口,也是实现中华优秀传统文化“两创”的关键抓手,对建设中国式乡村现代化具有显著的赋能作... 详细信息

中国式现代化是中国共产党领导的、有别于西方的社会主义现代化。特色文化产业是实现乡村全面振兴的有力支撑,是实现“第二个结合”的重要突破口,也是实现中华优秀传统文化“两创”的关键抓手,对建设中国式乡村现代化具有显著的赋能作用。鹤庆县持续推进“一村一业”发展模式,形成了以新华村为引领,覆盖县域整体的特色文化产业发展格局。通过铸牢中华民族共同体意识凝聚中国式现代化建设强大合力、激发和坚持特色文化产业发展的村民主体性地位、以“一村一业”特色文化产业集群推进中华优秀传统文化“两创”等途径,探索出了一条以特色文化产业助力乡村全面振兴、实现中国式乡村现代化的可行之路。

关键词：特色文化产业中国式现代化乡村现代化乡村振兴鹤庆县

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

Future Changes in the Impact of North Pacific Midlatitude Oceanic Frontal Intensity on the Wintertime Storm Track in CMIP5 Models

引用

Journal of Meteorological Research 2020年第6期34卷 1199-1213页

作者： Yao YAO Zhong ZHONG Xiu-Qun YANG xiaogang huang College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073 Jiangsu Collaborative Innovation Center for Climate Change School of Atmospheric SciencesNanjing UniversityNanjing 210023 Army Academy of Artillery and Air Defense(Nanjing Campus) Nanjing 211132

The storm track and oceanic front play an important role in the midlatitude air–sea interaction.In this study,future changes in the impact of the North Pacific midlatitude oceanic frontal intensity on the wintertime storm track are projected based on climate model outputs from the Coupled Model Intercomparison Project Phase 5(CMIP5).The performance of 13 CMIP5 models is evaluated,and it is found that a majority of these models are capable of reproducing the northward intensification of the storm track in response to the strengthened oceanic front.The ensemble means of outputs from six best models under three Representative Concentration Pathway(RCP)scenarios(RCP2.6,RCP4.5,and RCP8.5)are compared with the results of the historical simulation,and future changes are projected.It is found that the impact of the oceanic frontal intensity on the storm track tends to get stronger and extends further westward in a warming climate,and the largest increase appears in the RCP8.5 run.Further analysis reveals that the stronger impact of the oceanic front on the storm track in the future may be partially attributed to the greater oceanic frontal impact on the near-surface baroclinicity,which is mainly related to the intensified oceanic frontal impact on the meridional potential temperature gradient under the climate change scenario.However,this process can hardly explain the increasing impact of the oceanic front on the upstream of the storm track.

关键词： storm track midlatitude oceanic front climate change Coupled Model Intercomparison Project Phase 5(CMIP5)

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

病原宏基因组二代测序在宫颈相关疾病研究中的应用价值探索

引用

中华微生物学和免疫学杂志 2024年第4期44卷 336-345页

作者：黄佳玲殷怡华徐晓刚复旦大学附属华山医院抗生素研究所上海200040 同济大学附属第一妇婴保健院妇科上海201204

目的探索病原宏基因组二代测序(metagenomic next-generation sequencing,mNGS)在HPV感染、宫颈癌等宫颈相关疾病研究中的潜在价值。方法从6例宫颈癌或癌前病变患者中采集宫颈拭子标本;提取DNA后,分别进行病原mNGS和ⅡB型限制性内切酶相... 详细信息

目的探索病原宏基因组二代测序(metagenomic next-generation sequencing,mNGS)在HPV感染、宫颈癌等宫颈相关疾病研究中的潜在价值。方法从6例宫颈癌或癌前病变患者中采集宫颈拭子标本;提取DNA后,分别进行病原mNGS和ⅡB型限制性内切酶相关DNA位点(2bRAD)测序,比较2种方法的微生物物种定量注释结果、高丰度物种检测能力及14种高危型HPV的检测能力,从而评估病原mNGS的宫颈微生态评价能力。对病原mNGS的宿主基因组数据进行染色体拷贝数变异(copy number variation,CNV)分析,比较临床病理结果与mNGS-CNV结果的一致性。为进一步探究病原mNGS的检测能力,在23例无宫颈疾病和存在不同等级宫颈病变的患者样本中进行初步验证。结果微生物定量注释结果显示,mNGS和2bRAD对于高丰度细菌物种的检出基本一致。对与宫颈癌高度相关的14种高危型HPV的分析结果显示,mNGS获得了与临床微生物实验室常规检测完全一致的结果。对mNGS的人源核酸数据进行CNV分析显示,3例宫颈癌中有1例存在CNV异常。此外,利用病原mNGS对存在宫颈病变和无宫颈病变患者的宫颈拭子进行分析显示,卷曲乳杆菌丰度、CNV阳性率和高危型HPV阳性率在两组患者之间存在差异,普雷沃菌属的某些物种可能与发生高级别病变和宫颈癌的高风险相关。结论病原mNGS作为一种无创且高效的病原微生物检测技术,能通过一次检查同时得到菌群微生态、HPV感染状态及宿主染色体稳定性3方面的信息,从而对健康和宫颈疾病患者进行鉴别,因此有望为HPV感染和宫颈癌筛查和诊断开辟新途径。

关键词：宏基因组二代测序拷贝数变异宫颈癌人乳头瘤病毒

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：