检索结果-南通市图书馆

communication Resources Allocation for Time Delay Reduction of Frequency Regulation Service in High Renewable Penetrated Power System

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2024年第2期10卷 468-480页

作者： Hongjie He Ning Zhang chongqing Kang Song Ci Fei Teng Goran Strbac State Key Laboratory of Power Systems Department of Electrical EngineeringTsinghua UniversityBeijing 100084China Department of Electrical and electronic Engineering Imperial College LondonSW72BULondonU.K

The high renewable penetrated power system has severe frequency regulation *** resources can provide frequency regulation services but are limited by com-munication time *** paper proposes a communication resources allocation model to reduce communication time delay in frequency regulation *** device resources and wireless spectrum resources are allocated to distributed resources when they participate in frequency *** reveal impact of communication resources allocation on time delay reduction and frequency regulation ***,we study communication resources allocation solution in high renewable energy penetrated power *** provide a case study based on the HRP-38 *** show communication time delay decreases distributed resources'ability to provide frequency regulation *** the other hand,allocating more communication resources to distributed resources'communica-tion services improves their frequency regulation *** power systems with renewable energy penetration above 70%,required communications resources are about five times as many as 30%renewable energy penetrated power systems to keep frequency performance the *** Terms-communication resources allocation,commun-ication time delay,distributed resource,frequency regulation,high renewable energy penetrated power system.

关键词： communication resources allocation communication time delay distributed resource frequency regulation high renewable energy penetrated power system

Magnetic and dielectric properties of low temperature fired ferrite/ceramic composite materials

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

Progress in Natural Science:Materials International 2011年第1期21卷 21-26页

作者： Wei-wei LING~(1,2),Huai-wu ZHANG~1,Ying HE~1,Yuan-xun LI~1,Yun-yan WANG~1 1.State Key Laboratory of electronic Thin Films and Integrated Devices, University of electronic Science and technology of china,Chengdu 610054,china 2.Department of communication Engineering,Chengdu University of Information technology, Chengdu 610225,china State Key Laboratory of electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Department of communication Engineering Chengdu University of Information Technology

Ni-Cu-Zn ferrite/CaTiO3and Ni-Cu-Zn ferrite/BaTiO3composites which can be applied in low temperature co-fired ceramic（LTCC） technology were synthesized by conventional solid-state reaction at temperature lower than 950℃.Influence of the microstructures and the gap parameterδ/D on the complex permeability of the above two composites was *** modifiedδ/D values of the above two composites show a good fit to the magnetic circuit *** dielectric properties of the composites were predicted by the Maxwell-Garnctt effective medium theory and the discrepancy between measured and calculated values was analyzed.

关键词： ferrite/ceramic composite low temperature co-fired ceramic(LTCC) solid-state reaction magnetic properties dielectric properties

Influence of p-layer on the performance of n-i-p μc-Si:H thin film solar cells

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(Physics,Mechanics & Astronomy) 2010年第11期53卷 2042-2046页

作者： YUAN YuJie 1,2,ZHANG KaiLiang 1,2,WEI Zhen 1,2 & GENG XinHua 3 1 college of electronics Information Engineering,Tianjin University of technology,Tianjin 300384,china 2 Tianjin Key Laboratory of Film electronic and communication Devices,Tianjin University of technology,Tianjin 300384,china 3 Institute of Photo-electronics Thin Film Devices and Technique,Nankai University,Tianjin 300071,china Tianjin University of technology College of Electronics Information Engineering Tianjin China (GRID:grid.265025.6) Tianjin University of technology Tianjin Key Laboratory of Film Electronic and Communication Devices Tianjin China (GRID:grid.265025.6) Nankai University Institute of Photo-Electronics Thin Film Devices and Technique Tianjin China (GRID:grid.216938.7) (ISNI:***)

The high pressure radio frequency plasma enhanced chemical vapor deposition (RF-PECVD) process was adopted to prepare the n-i-p microcrystalline silicon solar cells,the influence of p-type layers on the performance of the solar cells was investigated,and the optimum p layer suited to the n-i-p microcrystalline silicon solar cells was *** experimental results demonstrate that the performance of the solar cells can be highly affected by the structural and optical properties of the p-layers,and the performance of solar cells can be greatly improved by optimizing p *** have achieved an initial active-area efficiency of 8.17% (V oc =0.49 V,J sc =24.9 mA/cm 2 ,FF=67%) for the μc-Si:H single-junction n-i-p solar cells and an initial active-area efficiency of 10.93% (V oc =1.31 V,J sc =13.09 mA/cm 2 ,FF=64%) for the a-Si:H/μc-Si:H tandem n-i-p solar cells.

关键词： microcrystalline silicon solar cells quantum confinement effect p-type layers

维普期刊数据库

To Design Logic Circuits by Using Symmetrical Coordinate

在线全文

学校读者我要写书评

暂无评论

To Design Logic Circuits by Using Symmetrical Coordinate

A novel radio resource allocation scheme for IEEE 802.16e multicell networks

2009 ISECS International Colloquium on Computing, communication, Control, and Management

作者： SHEN Xiao-Feng college of Physics and electronic technology Hubei University Wuhan,430062,china SHEN Yu electronic Information and Automatic college chongqing University of technology chongqing,400050,china YU Cheng-Bo(Corresponding author) electronic Information and Automatic college chongqing University of technology chongqing,400050,china

Limited to the methods used before in designing logic circuits,not a same tool could be used to design both the combined circuits and the time-sequential *** symmetrical coordinate system stated in this article can be constructed to represent various states of multi-dimensional logical *** the symmetrical coordinate system,it is not only possible to complete the design of combined circuits,but also to carry out all the procedures needed in the design of timesequence *** the combined circuits and the timesequential circuits can be easily designed with a same design tool. Examples are given in this article to illustrate how to use the system of symmetrical coordinate to design the logic circuits.

关键词： symmetrical coordinate Logic circuit Quadrants merge Procedure diagram

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

Science china(Information Sciences) 2011年第7期54卷 1444-1455页

作者： LIU Jian ,LONG KePing & XU Jie School of communication and Information Engineering,University of electronic Science and technology,Chengdu 611731,china School of communication and Information Engineering University of Electronic Science and Technology Chengdu China

In this paper,we propose a new media access control (MAC) protocol,which is compatible with the IEEE 802.16e-2005 Orthogonal Frequency Division Multiple Access (OFDMA) wireless *** this protocol,the same radio resource can be shared by neighboring cells in the wireless mesh network (WMN) and collisions can be reduced in the overlapping *** protocol consists of two schemes: a downlink transmission and an uplink *** downlink transmission we use a cross layer adaptive radio resource allocation (CL-ARRA) scheme,which consists of two steps: a dynamic subcarrier allocation (DSA) and a dynamic power allocation (DPA).For uplink transmission we propose a new subcarrier backoff scheme and use the Markov chain model to analyze this *** this protocol,we analyze the performance of the downlink and the uplink operation in the OFDMA *** analytical results are well matched to the simulation *** then extend our model to a star-mesh topology with multiple overlapped *** results show that the performance can be improved with the application of the superior capability of our proposed MAC protocol to deal with collisions in the overlapped regions.

关键词： orthogonal frequency division multiple access (OFDMA) 802.16e overlapping area wireless mesh network (WMN) cross layer design dynamic subcarrier allocation (DSA) dynamic power allocation (DPA) Markov chain

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

复杂系统控制中的相关技术讨论

西南师范大学学报（自然科学版） 2004年第6期29卷 1066-1068页

作者：彭莉林鹰杨奕重庆工业职业技术学院自动化系重庆400050 重庆交通学院管理工程系重庆400074 重庆工学院电子工程系重庆400050

针对复杂系统控制实现中存在的问题,在研究对象特性基础上,对控制策略作了分析对比,并指出仿人智能控制策略是明智的选择.重点讨论了控制操作平台的选取问题.工程实践说明,控制策略和监控信息平台的选取是复杂系统控制实现的关键... 详细信息

针对复杂系统控制实现中存在的问题,在研究对象特性基础上,对控制策略作了分析对比,并指出仿人智能控制策略是明智的选择.重点讨论了控制操作平台的选取问题.工程实践说明,控制策略和监控信息平台的选取是复杂系统控制实现的关键所在.

关键词：复杂系统控制仿人智能控制操作平台控制策略相关技术监控选取研究对象工程实践基础

维普期刊数据库

在线全文

学校读者我要写书评

暂无评论

实时异构监控系统数据平台的集成技术

西南师范大学学报（自然科学版） 2005年第1期30卷 87-91页

作者：林鹰郭兵杨奕重庆交通学院管理工程系重庆电子科技职业学院通信系重庆401147 重庆工学院电子工程系重庆400050

统一数据平台是信息化建设的关键步骤之一. 鉴于历史和技术等原因, 在企业中形成了各种类型的“自动化孤岛”、“信息化孤岛”, 大量有现实利用价值和潜在应用价值的数据信息流失、沉淀. 解决问题的方案就是做系统集成, 由于需求不同, ... 详细信息

统一数据平台是信息化建设的关键步骤之一. 鉴于历史和技术等原因, 在企业中形成了各种类型的“自动化孤岛”、“信息化孤岛”, 大量有现实利用价值和潜在应用价值的数据信息流失、沉淀. 解决问题的方案就是做系统集成, 由于需求不同, 存在各种类型的集成, 如DCS与FCS的集成、控制网与信息网的集成等等. 对实时监控系统集成的相关技术问题, 从各个不同层面做些探讨.

关键词：集散控制系统现场总线控制系统异构工控系统系统集成技术

维普期刊数据库

Super-orthogonal space-time code design based on the trellis diagram integrated operation

在线全文

学校读者我要写书评

暂无评论

Science china(Information Sciences) 2011年第7期54卷 1481-1490页

作者： AO Jun 1,2,MA ChunBo 1,AO FaLiang 1 & LIAO GuiSheng 3 1 college of Information and communication,Guilin University of electronic and technology,Guilin 541004,china 2 National Key Laboratory of Electromagnetic Environment,QingDao,266107,china 3 National Lab of Radar Signal Processing,Xidian University,Xi’an 710071,china college of Information and communication Guilin University of Electronic and Technology National Key Laboratory of Electromagnetic Environment

By studying the super-orthogonal space-time coding designs for 2 transmit antennas and superquasi orthogonal space-time coding designs for 4 transmit antennas,a novel super-orthogonal space-time coding design for 4 transmit antennas is *** exploiting the inherent structure association between OSTBC and QOSTBC,the proposed schemes can obtain the full-rate and good performance while keeping the coding complexity as super-orthogonal space-time coding schemes for 2 transmit *** results demonstrate that the proposed schemes outperforms the existing super-quasi orthogonal space-time coding schemes by almost 2 dB.

关键词： STBC TCM SOSTTC SQOSTTC

Terahertz radiation sources based on free electron lasers and their applications

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(Information Sciences) 2012年第1期55卷 1-15页

作者： TAN Ping1,HUANG Jiang2,LIU KaiFeng2,XIONG YongQian2&FAN MingWu1,2 1Department of electronic and Information Engineering,Huazhong University of Science and technology,Wuhan 430074,china 2college of Electrical and electronic Engineering,State Key Laboratory of Advanced Electromagnetic Engineering and technology,Huazhong University of Science and technology,Wuhan 430074,china Department of electronic and Information Engineering Huazhong University of Science and Technology college of Electrical and electronic Engineering State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Scie

The tunability,high power and flexible picoseconds-pulse time structure of terahertz(THz)radiation make the THz free-electron laser(FEL)a very attractive THz source of coherent *** paper focuses on the development and perspectives of THz radiation sources based on the *** principles of the low gain THz FEL oscillator,the SASE THz FEL amplifier and the supperradiant THz FEL are reviewed briefly,and the key technologies of THz FEL,such as injector,accelerator,undulator and optical cavity,are discussed,*** current status of and future prospects for THz radiation sources based on the FEL are emphasized in this *** research and development have shown bright future in free-electron laser(FEL)THz radiation *** potential applications can be carried out in the field of imaging,material research,biology medicine,communication,diagnostics and many others.

关键词： terahertz source terahertz applications free electron laser