检索结果-南通市图书馆

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

5G用作配电网差动保护通道的可行性分析

电力系统保护与控制 2021年第8期49卷 1-7页

作者：高维良高厚磊徐彬李林电网智能化调度与控制教育部重点实验室(山东大学) 山东济南250061

光纤铺设费用高且普及率较低,不利于配网差动保护的大面积推广。5G的高性能和商用化为解决配网差动保护通道问题提供了理想机遇。通过理论分析和计算,提出差动保护对于通信通道的要求,包括通道速率、时延、可靠性以及安全性等方面。介... 详细信息

光纤铺设费用高且普及率较低,不利于配网差动保护的大面积推广。5G的高性能和商用化为解决配网差动保护通道问题提供了理想机遇。通过理论分析和计算,提出差动保护对于通信通道的要求,包括通道速率、时延、可靠性以及安全性等方面。介绍并分析了5G差动保护实现的技术基础——网络切片、切片架构以及基于网络切片的电网安全体系。最后,通过分析5G的主要性能指标,得出5G对于配电网差动保护具有良好的适配性,可以取代光纤成为配网差动保护新的数据通道。

关键词：配电网差动保护 5G 通道可行性

Chronic necrotizing pulmonary aspergillosis without underlying diseases:2 clinical cases and literature review

在线全文

学校读者我要写书评

暂无评论

Chronic necrotizing pulmonary aspergillosis without underlyi...

中华医学会呼吸病学年会——2013（第十四次全国呼吸病学学术会议）

作者： Lingwei Wang Peng Yang Senquan Wu weiliang gao Chen Qiu The respiratory department of the second affiliated hospital of Jinan University Shenzhen peoples hospital

Chronic necrotizing pulmonary aspergillus(CNPA),also known as semi-invasive pulmonary aspergillus was first described in the early 1980s,usually caused by Aspergillus *** was then accepted as a distinct category of ch...

关键词：

Cycle-slip Detection and Correction of Network RTK based on Doppler Observation

在线全文

cnki会议

学校读者我要写书评

暂无评论

Cycle-slip Detection and Correction of Network RTK based on ...

第三届中国卫星导航学术年会

作者： WANG weiliang,gao Chengfa,PAN Shuguo Southeast University,Nanjing,China,210096

Cycle-slip detection and correction of Network RTK is the key problem of Network RTK precise positioning,which will affect the resolution of ambiguity,and eventually the positioning accuracy of *** that Network RTK observations can provide Doppler observation,a method of cycle-slip detection and correction of Network RTK based on Doppler observation was proposed in this *** data from TJCORS was used in tests of this thesis,and cycle-slips are added artificially in the *** results show that the method this thesis proposed can effectively detect and correct both small and big cycle-slips,and have the advantage of high accuracy,convenient and audiovisual over other existing *** all,the method this thesis proposed can be used for Cycle-slip detection and correction of Network RTK.

关键词： Doppler Observation Cycle-slip Detection and Correction Carrierphase Observation Network RTK

Tuning crystal structure and magnetic property of dispersible FePt intermetallic nanoparticles

在线全文

cnki会议

学校读者我要写书评

暂无评论

Science China Materials 2018年第7期61卷 961-968页

作者： Jing Yu weiliang gao Fei Liu Yanmin Ju Fan Zhao Ziyu Yang Xin Chu Shenglei Che Yanglong Hou College of Materials Science and Engineering Zhejiang University of Technology Hangzhou 310014 China Department of Materials Science and Engineering College of Engineering Peking University Beijing 100871 China Department of Materials Science and Engineering Iowa State University of Science and Engineering Ames 50011 USA

Dispersible FePt intermetallic nanopartides （NPs） with tunable composition were synthesized by thermal annealing of MgO coated A1-FePt （or A1-FePt-Fe304） NPs followed by an acid treatment to remove MgO. High-tem- perature annealing facilitates the conversion of FePt from disordered alloy to ordered intermetaUics. Under the protec- tion of MgO, the diffusion of Fe and Pt atoms was limited, making it possible for the atom reconstruction in the lattice to give discrete FePt intermetaUic NPs after a facile acid etching process. FePt intermetallic NPs formed face-centered cubic and face-centered tetragonal structures with their magnetic properties tuned by composition. The saturation magnetiza- tion was adjusted from 8 to 52 emu g^-1 by increasing the Fe concentration, while the coercivity reached a max/mum of 33 kOe when Fe concentration was 44%. After surface mod- ifications by hydrophilic or hydrophobic molecules containing thiol groups, FePt intermetallic NPs could be dissolved into water or hydrocarbon solvents. The hydrophilic L10-FePt in- termetallic NPs were applied as contrast agents for magnetic resonance imaging, showing a high transverse relaxivity of 328.6 mmo1^-1 L s^-l, which indicated the great potential of FePt intermetallic NPs as molecular probes for cancer diagnosis.

关键词： FePt intermetallic nanoparticles chemical ordering magnetic materials contrast agent

POZD涂覆钢板加固钢筋混凝土板抗爆性能研究

在线全文

学校读者我要写书评

暂无评论

材料导报 2023年第21期37卷 285-292页

作者：魏广帅汪维杨建超高伟亮宁波大学冲击与安全工程教育部重点实验室浙江宁波315211 军事科学院国防工程研究院河南洛阳471023

为了研究聚异氰氨酸酯噁唑烷(Polyisocyanate oxazodone,POZD)聚合物高分子材料涂覆钢板-钢筋混凝土板在接触爆炸荷载作用下的抗爆性能,开展了接触爆炸试验和数值模拟研究,对其破坏特征进行分析。采用有限元软件LS-DYNA建立了钢筋混凝... 详细信息

为了研究聚异氰氨酸酯噁唑烷(Polyisocyanate oxazodone,POZD)聚合物高分子材料涂覆钢板-钢筋混凝土板在接触爆炸荷载作用下的抗爆性能,开展了接触爆炸试验和数值模拟研究,对其破坏特征进行分析。采用有限元软件LS-DYNA建立了钢筋混凝土板、炸药、钢板和POZD的有限元模型,讨论了不同药量下POZD涂覆钢板加固钢筋混凝土板的破坏模式和破坏特征。试验及数值结果表明:在钢板-钢筋混凝土板背面涂覆POZD涂层能有效提升结构的抗爆性能;在接触爆炸作用下,POZD涂覆钢板加固钢筋混凝土板试件呈现四种破坏模式。

关键词： POZD涂覆钢板钢筋混凝土板破坏模式爆炸荷载

Nonlinear Active Antenna

在线全文

学校读者我要写书评

暂无评论

Nonlinear Active Antenna

2007 IEEE International Workshop on Anti-counterfeiting,Security,Identification

作者： Ling Xiang Jiang Yonghua Jiang Zhisheng gao weiliang Naval Aeronautical Engineering Institute Yantai 264001 China

A new nonlinear active antenna is presented. The dynamics of nonlinear active phase array based on coupled oscillators and coupled phase locked loop are analyzed. Tuning the free-running frequencies of the edge oscillators, a constant phase gradient between the adjacent oscillators can be obtained. This new antenna can achieve beam-scanning without phase-shifter. Two experimental circuits are also shown.

关键词： nonlinear coupled oscillators coupled PLL beam-scanning

A Phase-shifterless Active Phase Array Using Coupled Oscillators

在线全文

cnki会议

学校读者我要写书评

暂无评论

A Phase-shifterless Active Phase Array Using Coupled Oscilla...

IEEE 2007 International Symposium on Microwave,Antenna,Propagation and EMC Technologies for Wireless Communications(ISMAPE-2007)

作者： gao weiliang Jiang Yonghua Ling Xiang Li Jun (Naval Aeronautical Engineering Institute,Yantai 264001 China)

A new kind of phased array using coupled oscillators is introduced which needs no phase *** slightly detuning the edge array elements a constant phase gradient can be established. The dynamic of nearest-neighbor coupled oscillators array is analyzed.A one-dimensional experimental array at S-band is designed,giving the actual measured phase progression that is continuously variable over the range - 70°<△φ<62°comparing the theoretical range - 90°<△φ<+90°

关键词：

在线全文

cnki会议

学校读者我要写书评

暂无评论

爆破作用下山岭隧道衬砌动态响应分析

应用力学学报 2020年第4期37卷 1737-1744,I0025页

作者：高卫亮王光勇张运强黄河交通学院焦作454950 河南理工大学土木工程学院焦作454000 湖南大学土木工程学院长沙410075

基于数值计算方法,研究了在底部动载下拱桥铺山岭隧道衬砌的振动速度、应力以及弯矩的分布规律。得到在底部爆破动载作用下,隧道衬砌拱底振动速度峰值最大,其次是两帮,拱顶最小。随着动载作用时间推移,最大主应力越来越大,最小主应力先... 详细信息

基于数值计算方法,研究了在底部动载下拱桥铺山岭隧道衬砌的振动速度、应力以及弯矩的分布规律。得到在底部爆破动载作用下,隧道衬砌拱底振动速度峰值最大,其次是两帮,拱顶最小。随着动载作用时间推移,最大主应力越来越大,最小主应力先增大后减小;拱脚处受压较大,拱顶处受拉较大。随着底部动载的传播,最小弯矩和最大弯矩逐渐增大,直至动载趋于稳定时略有回落;隧道衬砌拱脚处负弯矩较大,隧道衬砌拱底处正弯矩较大。

关键词：隧道工程爆破衬砌动态响应数值分析

在侧爆作用下既有山岭隧道支护结构动态响应分析

在线全文

学校读者我要写书评

暂无评论

应用力学学报 2020年第5期37卷 2297-2302,I0032页

作者：高卫亮王光勇张运强黄河交通学院焦作454950 河南理工大学土木工程学院焦作454000 湖南大学土木工程学院长沙410075

基于现场监测数据,采用数值分析方法研究了在侧爆作用下拱桥铺山岭隧道衬砌弯矩和锚杆轴力的动态响应规律。随着应力波的传播,衬砌最大正负弯矩先增加后减小,右衬砌拱脚一直受到较大负弯矩作用,衬砌受到正弯矩较大位置在右侧拱腰至拱脚... 详细信息

基于现场监测数据,采用数值分析方法研究了在侧爆作用下拱桥铺山岭隧道衬砌弯矩和锚杆轴力的动态响应规律。随着应力波的传播,衬砌最大正负弯矩先增加后减小,右衬砌拱脚一直受到较大负弯矩作用,衬砌受到正弯矩较大位置在右侧拱腰至拱脚之间。在右侧动载的作用下,无衬砌影响时,锚杆受到的拉力明显增加,并且每根锚杆轴力从锚头至锚尾先增加后减小;受衬砌的影响时,锚杆受到的拉力明显减弱,受到的压力有所增强。

关键词：隧道工程侧爆支护结构动态响应数值分析