检索结果-南通市图书馆

A policy-based automated negotiation for privileges in grid environments

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

Journal of Pharmaceutical Analysis 2009年第1期21卷 11-16页

作者： Run-lian Zhang1,2, Xiao-nian Wu2,3. Xiao-she Dong11.school of electronic & information Engineering, Xi’an Jiaotong {3., Xi’an 710049, china 2.school of information and communication, guilin {3. of electronic Technology, guilin 541004, china 3.National Laboratory for Modern communications, Chengdu 610041, china. school of electronic and information Engineering Xi'an Jiaotong University Xi'an 710049 China school of information anf communication Guilin University of Electronic Technology Guilin 541004 China National Laboratory of Modern communications Chengdu 610041 China

To maintain the global consistency of the authorizing is a challenge when the system authorization is changed in grid environments. This paper proposes a policy-based automatically negotiating method to deal with this issue. An effective system framework, which includes the certificate management, the access policy repertory, the negotiator and the automatically negotiating mechanism, is designed and implemented. The experimental results show that automated negotiation can quickly regain the global authorization consistency and only cause a little system overhead increasing. Compared with the manual authorization maintaining, the presented method can reduce the negotiating time significantly, and reduce the meaningless grid jobs because the inconsistent privileges are controlled timely.

关键词： grid security authorization policy negotiation

Phase engineering of Ni-Mn binary layered oxide cathodes for sodiumion batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第4期91卷 501-511页

作者： Feifei Hong Xin Zhou Xiaohong Liu guilin Feng Heng Zhang Weifeng Fan Bin Zhang Meihua Zuo Wangyan Xing Ping Zhang Hua Yan Wei Xiang College of Materials and Chemistry&Chemical Engineering Chengdu University of TechnologyChengdu 610059SichuanChina College of Chemical Engineering Sichuan UniversityChengdu 610065SichuanChina Research Institute for electronic Science(RIES)and Division of information Science and Technology Graduate School of Information Science and TechnologyHokkaido UniversityN20W10SapporoHokkaido 001-0020Japan school of Materials Science and Engineering Suzhou University of Science and TechnologySuzhou 215009JiangsuChina Yibin Libode New Materials Co. Ltd.Yibin 644200SichuanChina Engineering Research Center of the Ministry of Education for Advanced Battery Materials School of Metallurgy and EnvironmentCentral South UniversityChangsha 410083HunanChina

Nickel-manganese binary layered oxides with high working potential and low cost are potential candidates for sodium-ion batteries,but their electrochemical properties are highly related to compositional *** composite materials with various phase structures of P3.P2/P3.P2,P2/O3.and P2/P3.O3.were synthesized by manipulating the sodium content and calcination conditions,leading to the construction of a synthetic phase diagram for Na_(x)Ni_(0.25)Mn_(0.75)O_(2)(0.45≤x≤1.1).Then,we compared the electrochemical characteristics and structural evolution during the desodiation/sodiation process of P2,P2/P3.P2/03.and P2/P3.O3.Na_(x)Ni_(0.25)Mn_(0.75)O_(2).Among them,P2/P3.Na0.75Ni0.25Mn0.75O2exhibits the best rate capability of 90.9 mA h g^(-1)at 5 C,with an initial discharge capacity of 142.62 mA h g^(-1)at 0.1 C and a capacity retention rate of 78.25%after 100 cycles at 1 C in the voltage range of 2-4.3.*** observed superior sodium storage performance of P2/P3.hybrids compared to other composite phases can be attributed to the enhanced Na^(+)transfer dynamic,reduction of the Jahn-teller effect,and improved reaction reversibility induced by the synergistic effect of P2 and P3.*** systematic research and exploration of phases in Na_(x)Ni_(0.25)Mn_(0.75)O_(2)provide new sights into high-performance nickel-manganese binary layered oxide for sodium-ion batteries.

关键词： Phase engineering Ni-Mn layered oxide Cathode Sodium-ion batteries

Bifurcation of travelling wave solutions for (2+1)-dimension nonlinear dispersive long wave equation

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics(A Journal of Chinese Universities) 2009年第3期24卷 291-297页

作者： RONG Ji-hong TANG Sheng-qiang school of Mathematics and Computing Science,guilin university of {3. Technology,guilin541004,china school of Mathematics and Computing Science Guilin University of Electronic Technology Guilin 541004 China

In this paper,the bifurcation of solitary,kink,anti-kink,and periodic waves for （2＋1）-dimension nonlinear dispersive long wave equation is studied by using the bifurcation theory of planar dynamical *** parameter sets are shown,and under various parameter conditions,all exact explicit formulas of solitary travelling wave solutions and kink travelling wave solutions and periodic travelling wave solutions are listed.

关键词： solitary wave kink and anti-kink wave periodic wave (2+1)-Dimension nonlinear dispersive long wave equation

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 {3. 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 {3.,Xi’an 710071,china 1. College of information and communication Guilin University of Electronic and Technology Guilin 541004 China2. National Key Laboratory of Electromagnetic Environment QingDao 266107 China3. National Lab of Radar Signal Processing Xidian University Xi’an 710071 China

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

Influence of Pr Content on the Sructure and Giant Magnetoresistance of Pr_x(Co_(40)Ag_(60))_(100-x) Granular Films

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Wuhan university of Technology(Materials Science) 2011年第1期26卷 1-3页

作者：成钢 school of Materials Science and Engineering Guilin University of Electronic Technology Guangxi Key Laboratory of information Materials

Prx（Co40Ag60）100-x （x=0, 0.5, 1, 1.5, 2, 3. granular films have been prepared by DC magneto controlled sputtering method. The XRD data indicated that Pr element favors the （111） plane preferential orientation. Magnetic measurements indicate that the average size of magnetic particles decreases as Pr content increases. For relatively low addition of Pr to CoAg granular films, Pr element can enhance GMR value and a peak value of about -14.3. is obtained at x=1.

关键词： giant magnetoresistance granular films magnetic particle

A new grid-associated algorithm in the distributed hydrological model simulations

在线全文

学校读者我要写书评

暂无评论

Science china(Technological Sciences) 2010年第1期53卷 235-241页

作者： XU Rui1,2,HUANG XiaoXue1,LUO Lin1 & LI ShaoCai3.1 State Key Laboratory of Hydraulics and Mountain River Engineering College of Architecture and Environment,Sichuan university,Chengdu 610065,china 2 College of electronic Engineering,{3. university of electronic Technology,{3. 541004,china 3.College of Life Sciences,Sichuan university,Chengdu 610065,china 1. State Key Laboratory of Hydraulics and Mountain River Engineering College of Architecture and Environment Sichuan University Chengdu 610065 China2. College of Electronic Engineering Guilin University of Electronic Technology Guilin 541004 China3. College of Life Sciences Sichuan University Chengdu 610065 China

This paper presents a new grid-associated algorithm to improve the performance of a D8 algorithm based distributed hydrological model *** algorithm is based on the well known single-flow D8 algorithm of grid *** algorithm allocates calculation priorities according to the distance between the units and the outlet,then carries out the ergodic computations of the hydrological units according to the priority *** the parallelized algorithm,a standard thread-level shared memory system for parallel programming(OpenMP-Open specifications for Multi Processing) was introduced,and the parallel coding was implemented in C lan-guage.A case study showed that the absolute speed-up ratio of the grid-associated algorithm is 1.64 over the original D8 algorithm,and the linear speed-up ratio of the parallel associated algorithm is 2.42 under 4 *** parallel grid-associated algorithm can be applied to a variety of research fields that use the grid method.

关键词： distributed hydrological model grid-association algorithm OpenMP parallel computing

Si基Bi_4Ti_3._(12)铁电薄膜的制备与特性研究

在线全文

学校读者我要写书评

暂无评论

物理学报 2004年第4期53卷 1265-1270页

作者：王华桂林电子工业学院通信与信息工程系桂林541004

采用sol_gel工艺 ,在分层快速退火的工艺条件下成功地制备了高质量Si基Bi4Ti3.12 铁电薄膜 .研究了Si基Bi4Ti3.12 薄膜的生长行为、铁电性能、C_V特性和疲劳特性 .研究表明 :Si基Bi4Ti3.12 薄膜具有随退火温度升高沿c轴择优生长的趋势 ... 详细信息

采用sol_gel工艺 ,在分层快速退火的工艺条件下成功地制备了高质量Si基Bi4Ti3.12 铁电薄膜 .研究了Si基Bi4Ti3.12 薄膜的生长行为、铁电性能、C_V特性和疲劳特性 .研究表明 :Si基Bi4Ti3.12 薄膜具有随退火温度升高沿c轴择优生长的趋势 ;退火温度通过影响薄膜的晶粒尺寸、生长取向和薄膜中载流子的浓度来改变Si基Bi4Ti3.12 薄膜的铁电性能 ;Ag Bi4Ti3.12 p_Si异质结的C_V特性曲线呈现顺时针回滞 ,可以实现极化存储 ;10 9次极化反转后Bi4Ti3.12 薄膜的剩余极化仅下降 12 % 。

关键词：铁电薄膜钛酸铋退火处理 C-V特性薄膜生长剩余极化率

Analysis on the positioning precision of CAPS

在线全文

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2009年第3期52卷 328-332页

作者： JI YuanFa1,2 & SUN XiYan1,2 1 National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, china 2 Applied Science and Technology College, guilin university of {3. Technology, guilin 541004, china 1. National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China 2. Applied Science and Technology College Guilin University of Electronic Technology Guilin 541004 China

As a newly developed satellite positioning system, the Chinese Area Positioning System (CAPS) is a typical direct sequence spread spectrum ranging system like GPS. The positioning precision of such navigation signals depends on many factors, including the pseudo-code rate, the signal to noise ratio, the processing methods for tracking loops and so on. This paper describes the CAPS link budget, the solution approach for CAPS positioning, focusing on the autocorrelation function feature of C/A code signals. The CAPS signal measurement precision is studied by the software approach together with theoretical analysis of the range resolution. Because the conventional Delay Lock Loop (DLL) is vul- nerable to the impact of noise, a narrow correlator and multiple correlators as well as the corresponding discrimination methods of phases are proposed, which improves the robustness of DLL and the code-phase resolution of the measurement. The results show that the improvement of the DLL structure and the discrimination method are the most important way to improve the ranging resolution. Theoretical analysis and experimental results show that a CAPS receiver could reach a 20-m positioning precision by using three satellites with a supported height from an altimeter.

关键词： satellite navigation receiver narrow correlation tracking loop

Study on Intention and Forming Conditions of SMT-MG

在线全文

学校读者我要写书评

暂无评论

武汉理工大学学报 2006年第S2期28卷 448-452页

作者： SHANG Yuling~1 LI Chunquan~2 1.Dept.of electronic Engineering,guilin university of electronic Technology,guilin 541004,china 2.Dept.of electronic Machinery and Traffic Engineering,guilin university of electronic Technology,guilin 541004,china Dept.of electronic Engineering Guilin University of Electronic TechnologyGuilin 541004China Dept.of electronic Machinery and Traffic Engineering Guilin University ofElectronic TechnologyGuilin 541004China

Surface Mount Technology Manufacturing Grid (SMT-MG) is the application of the grid technology in the SMT product *** this paper,as the new manufacturing mode of SMT product,SMT-MG was brought *** the concept and intention of the SMT-MG were *** from the three aspects of sufficient condition,necessary condition and stability condition,the static and dynamic conditions under which the SMT-MG was formed were mainly ***,it was proved that the formation and development of SMT-MG is feasible and necessary.

关键词： SMT-MG necessary condition sufficient condition