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Search Results: 1 - 10 of 32887 matches for " CHU Chun-Xue "
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2,8-Dimesitylboranyl-6H,12H-5,11-methanodibenzo[b,f][1,5]diazocine
Chun-Xue Yuan
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536811051051
Abstract: In the title compound, C51H56B2N2, a substituted Tr ger's base, the dihedral angle between the two benzene rings constituting the Tr ger's base framework is 104.42 (6)°. The crystal structure is stabilized by C—H...π and weak C—H...N interactions.
PURIFICATION AND PROPERTIES OF β -GLUCOSIDASE FROM THERMOPHILIC CHEATOMIUM THERMOPHILE
一株嗜热毛壳菌β-葡萄糖苷酶的分离纯化及特性

CHU Chun-Xue,LI Duo-Chuan,GUO Run-Fang,
楚春雪
,李多川,郭润芳

菌物学报 , 2004,
Abstract: 研究了液体发酵嗜热毛壳菌Chaetomium thermophile产生的β-葡萄糖苷酶的分离纯化及特性。粗酶液经硫酸铵沉淀、DEAE-Sepharose Fast Flow阴离子层析、Phenyl-Sepharose 疏水层析、Sephacryl S-100分子筛层析等步骤后获得凝胶电泳均一的β-葡萄糖苷酶。经12.5%SDS-PAGE和凝胶过滤层析方法分别测得该酶的分子量大小约为78.4kDa和81kDa。该酶反应的最适温度和pH值分别为60℃和4.5-5.0。有较好的酸稳定性和热稳定性。金属离子对β-葡萄糖苷酶的活性影响较大, 其中Ca2+对酶有激活作用, 而Ag+、Cu2+ 、Hg2+对酶有显著的抑制作用。该酶对水杨苷具有很强的底物特异性。
Research on QoS Scheduling Strategies for Remote NCS
远程NCS的QoS调度策略研究

WU Chun-xue,GUO Xian-hui,
邬春学
,郭贤辉

计算机科学 , 2009,
Abstract: As Internet only provides best effort service,its random and uncertain delay can not guarantee QoS requirements,such as real-time performance,for remote networked control systems based on Internet,making the stability performance of control systems poor.On the basis of the traditional distributed QoS routing strategies for IP-network,we put forward an QoS scheduling strategy,based on data priority mechanism and instruction speculate technology,for remote NCS.It was illustrated through the NS2 simulation exp...
Implementation of an Ad Hoc Network Protocol E-OAODV Improving the Performance of TCP
一种提高TCP性能的移动自组网E-OAODV协议的实现

WU Chun-xue,YANG Chao-liang,
邬春学
,杨朝梁

计算机科学 , 2009,
Abstract: In order to improve the performance of TCP used in Ad Hoc networks,an enhanced routing protocol based on AODV was presented,which is called E-OAODV(Enhanced Optimal Ad Hoc On-demand Distant Vector)in this paper.By using routing information included in ACK returned from destination nodes,E-OAODV tries to transfer data to destination node while routing failures occurred.And at the same time,with modifications in both TCP and OAODV,E-OAODV tries its best to recover the lost data caused by routing failures.By N...
Double clusters layered structure for Ad hoc network
Ad hoc 网络双簇头分层结构*

WU Chun-xue,WANG Kai-li,
邬春学
,王开立

计算机应用研究 , 2009,
Abstract: By analyzing the existing Ad hoc architecture problems, put forward a two-tiered structure of cluster head. Cluster head from the first generation, routing protocol and data communications to achieve the three main points of detailed information on dual-layered structure of cluster head. Finally, from an average of cluster counts and the two in terms of throughput dual cluster head with a single cluster head layered structure and increase in performance simulation analysis. Thought for the Ad hoc architecture provides a new direction.
Research and Implementation of Multi-path Routing Protocol EMP-AOMDV
多路径路由协议EMP—AOMDV的研究与实现

WU Chun-xue,YANG Chao-liang,
邬春学
,杨朝梁

计算机科学 , 2009,
Abstract: In AODV routing protocol,an intermediate node can reply a RREQ when it has a route with a sequence number that is greater than or equal to that contained in the RREQ,no matter how many packets are waiting to send in it.These routes' performance may degrade because local congestions may incur on those nodes with the increase of offered load.To solve this problem,a multi-path routing methods MP-AOMDV had been optimized on the basis of AODV.This optimized protocol is called EMP-AOMDV (Enhanced Ad hoc On-demand...
Analysis of AODV in MANET-based NCS
AODV在移动自组网络控制系统中的应用研究

WU Chun-xue,HAN Wen-dong,
邬春学
,韩文冬

计算机应用 , 2007,
Abstract: 在对AODV的路由建立及路由维护机制分析的基础上,结合移动自组网络控制系统(NCS)中数据传输的特点,对AODV的路由维护机制做了改进,即当链路中断时立刻由影响到的源节点发起路由建立,以减少网络延时。NS2仿真结果表明,当网络规模不大时,改进后的协议能有效减少移动自组NCS端到端平均延时,有助于提高系统的可靠性。
Overlay network-based least-cost scheduling strategies for NCS
基于覆盖架构的NCS最小代价调度策略

WU Chun-xue,GUO Xian-hui,
邬春学
,郭贤辉

计算机应用 , 2008,
Abstract: 将覆盖网络引入到基于Internet的网络控制系统(NCS)中,讨论了一种适合于Internet网络控制系统的相近最小代价调度(MLCS)策略,并对其进行了优化.通过仿真系统表明,该基于覆盖网络的调度及其优化策略能有效地保证网络服务质量QoS,从而提高NCS的性能.
Analysis of GA in overlay-based NCS
遗传算法在Overlay-NCS中的应用研究

WU Chun-xue,GUO Xian-hui,
邬春学
,郭贤辉

计算机应用 , 2009,
Abstract: Because of random and uncertain delay, Internet can not guarantee QoS requirements of Internet-based remote Networked Control System (NCS), such as real-time performance, thus affecting the stability of NCS. This paper combined the data transmission characteristics of remote NCS, using Overlay Network to improve the basic network QoS services and genetic algorithm and simulated annealing to optimize Overlay Network costs. These strategies can guarantee the reliability of remote NCS. It was illustrated through the simulation experiments that the strategies in the paper can minimize Overlay Network total costs on the basis of meeting the delay requirements of the remote NCS. It was helpful to the deployment of the control system in the Internet.
Vapor-liquid equilibrium of coal liquefied oil fractions under high temperature and high pressure
高温高压下煤液化油气液平衡体系的研究

YANG Chun-xue,FENG Jie,
杨春雪
,冯杰

燃料化学学报 , 2009,
Abstract: In order to get the vapor-liquid equilibrium constants under the real liquefaction conditions, the data from the fractions of coal liquefied distillation oil and different gas, such as H2 and C2H6, were combined together to establish the coal liquefied oil flash distillation system through the process simulation software Aspen Plus. By using the flash-distillation system, the vapor-liquid equilibrium composition and distribution were calculated at reaction temperature and pressure. Also the rules of equilib...
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