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971.
ZHOUXiang HUCheng-zheng GONGPing WANGAi-jun 《武汉大学学报:自然科学英文版》2005,10(2):385-388
The relations between Hall effect and symmetry are discussed for all 2- and 3-dimensional quasicrystals with crystallographical|y forbidden symmetries. The results show that the numbers of independent components of the Hall coefficient (R11) are one for 3-dimensional quasicrystals, two for those 2-dimensional quasicrystals whose symmetry group is non-Abelian, and three for those 2-dimensional quasicrystals whose symmetry group is Abelian. respectively. The quasicrysta[s with the same number of independent components have the same form of the components of R11. 相似文献
972.
HUANG Dan SUN Hongmei LIU Taiqi XU Fan SHEN Qi 《科学通报(英文版)》2005,50(17):1843-1845
Cp2Yb·2THF reacts with CpNa in 1:1 molar ratio in THF at 40℃ for 2 h, and the in situ generated anionic divalent complex NaYbCp3(THF)n reacts further with an excess of CpH at 40℃ for 48h, after work-up, affording the trivalent anionic ytterbium complex[Na(THF)2(μ2-η^5-Cp) (η^5, η^5,η^1-Cp3Yb)(THF)]n:(1) by oxidation reaction of Cp2Yb with CpH. Crystal structure determination reveals that complex 1 has one-dimension polymeric chains of distinct Na(THF)2(μ2-η^5-Cp) (η^5, η^5,η^1-Cp3Yb)(THF) units, which were formed by the coordination of the bridging Cp ligand with Cp3Yb'THF and Na(THF)2 in η^5,η^5 mode via self-assembly. 相似文献
973.
QI Yingqun WANG Tiejun HU Xiujie CHEN Ping 《科学通报(英文版)》2005,50(20):2288-2290
Poly(3,4-ethylenedioxythiophene) (PEDOT) has at- tracted much attention due to its high conductivity, excel- lent environmental stability and chemical processabil- ity[1,2]. PEDOT/PSS dispersion is a water-soluble system using poly(styrene sulfonic acid) (PSS) as the doping counterion during polymerization. The inclusion of PSS results in better solubility and processability to the PE- DOT/PSS aqueous dispersion[3, 4]. Recently, synthesis of one-dimensional (1D) multifunc- tional co… 相似文献
974.
975.
XIEZhihong YANGYi PINGShuzheng CHENMing ZHANGwei LUWei XUYuquan LIUHongjuan WANGGuoying E.Claudine LINMin 《科学通报(英文版)》2005,50(2):190-192
Pseudomonas stutzeri AI501 (formerly Alcaligenes faecalis A1501), which was isolated from rice paddies in South China in 1980, can colonize tightly on rhizoplane of the host plants or invade the roots of plants for growth and nitrogen fixation. But A1501 can fix nitrogen only under the micro-aerobic and nitrogen-free conditions. The oxygen concentration and the availability of fixed nitrogen are therefore important factors in the regulation of nitrogenase biosynthesis of associative nitrogen-fixing bacteria. 相似文献
976.
Variation characteristics of soil respiration fluxes in four types of grassland communities under different precipitation intensity 总被引:11,自引:0,他引:11
DONG Yunshe QI Yuchun LIU Jiyuan GENG Yuanbo Manfred Domroes YANG Xiaohong & LIU Lixin . Institute of Geographical Sciences Natural Resources Research Chinese Academy of Sciences Beijing China . Department of Geography Mainz University D- Mainz Ger- many 《科学通报(英文版)》2005,50(6):583-591
In the global carbon cycle studies, terrestrial ecosys- tem has become one of the greatest uncertain ecosystems in the current carbon cycle studies owing to the complex- ity of its underlying surface and intense disturbance of anthropogenic activities[1], hence depth studies of it serveas a key in seeking for the “missing carbon sinks” of at-mosphere. In the terrestrial ecosystem, soil organic carbonreservoir is an important component of carbon reservoir inthe system, its carbon … 相似文献
977.
LIANG Quanfeng CHEN Ming xu Yuquan ZHANG Wei PING Shuzhen LU Wei SONG Xianlong WANG Weiwei GENG Lizhao Takeo Masahiro LIN Min 《科学通报(英文版)》2005,50(15):1612-1616
A convenient and widely applicable method has been developed to clone aniline metabolic gene cluster in this study. Three positive recombinant plasmids pDA1, pDB2 and pDB11 were cloned from genomic library of aniline degradation strain AD9. The result of aniline dioxygenase (AD) activity and catechol 2,3-oxygenase (C230) activity assay showed that pDA1 and pDB11 contain aniline dioxygenase genes and catechol 2,3-dioxygenase genes, respectively. The sequence analysis of the total 24.7-kb region revealed that this region contains 25 ORFs, of which 17 genes involve metabolism of aniline. In the gene cluster, the first five genes (tadQTA1A2B) and the subsequent gene (tadR1) were predicted to encode a multi-component aniline dioxygenase and a LysR-type regulator, respectively, while the others (tadD1C1D2C2EFGIJKL) were expected to encode metacleavage pathway enzymes for catechol degradation. The gene cluster was surrounded by two IS1071 sequences. 相似文献
978.
一类二维离散混沌系统在不同系统参数下的自适应混沌同步 总被引:4,自引:0,他引:4
基于参量自适应控制中的混沌同步.针对一类二维离散混沌系统,提出了混沌系统在不同系统参数下的混沌同步方法,并给出了理论证明和实际应用例子。其理论结果很容易扩展到高维系统。 相似文献
979.
基于IEEE802.11e MAC的联合无线资源管理 总被引:1,自引:0,他引:1
联合无线资源管理(JRRM)是针对耦舍多种无线接入技术的异构网络进行无线资源管理的一种新型机制,其目的是基于重配置技术和业务分流来整体优化异构网络的资源利用率。这种资源管理机制对其管理的各个接入网提出了QoS保证机制的要求。IEEE 802.11e的提出为WLAN提供了MAC层的QoS保证机制,从而促使IRRM能够高效工作。对基于IEEE 802.11e MAC的JRRM进行介绍,并分析了在联合会话允许控制和联合资源调度方面,基于IEEE802.11e MAC的方式能够改善异构无线环境中的网络性能。 相似文献
980.
带纵向内筋筒形件滚珠反旋工艺模拟和缺陷分析 总被引:1,自引:0,他引:1
通过对筒形件滚珠旋压工艺特点的分析,依据有限元原理建立了筒形件滚珠旋压反旋的三维有限元模型,用有限元软件对筒形件滚珠旋压工艺进行了数值模拟,分析了带内筋的筒形件滚珠旋压的变形机理及椭圆形端口和表面剥离缺陷产生的原因。分析认为,椭圆形端口是金属变形规律而产生的,因而是不可避免的;表面剥离主要是由于压力角较大而产生的,增大滚珠直径可以减少表面剥离缺陷的产生。 相似文献