排序方式: 共有27条查询结果,搜索用时 0 毫秒
21.
设计合成了一种新型的基于5-芳基-2-巯基噁二唑辅助配体的双核环金属铂配合物(dfppy)2Pt2(C8OXT)2,其中dfppy为2-(4,6-二氟苯基)吡啶,C8OXT为5-苯基-2-巯基-1,3,4-噁二唑桥连配体.系统研究了该双核铂配合物(dfppy)2Pt2(C8OXT)2的热稳定性、光物理、电化学及电致发光性能.以(dfppy)2Pt2(C8OXT)2作为客体掺杂到聚合物主体材料中制备了单发光层聚合物电致发光器件.器件展现了饱和的红光发射,其最大发射峰为620nm.当配合物掺杂浓度为8wt%时,器件性能达到最好.其最高外量子效率为8.4%,最高电流效率为4.2cd/A,最大亮度为3228cd/m2.本研究表明,以5-苯基-2-巯基-1,3,4-噁二唑作为桥连配体的双核铂配合物在聚合物器件中能够实现高效红光发射. 相似文献
22.
23.
24.
In this paper, we first study the strong law of large
numbers for the frequencies of occurrence of random ordered couples of states
for nonhomogeneous bifurcating Markov chains indexed by a binary tree. Then
the strong law of large numbers are studied for functions of the nonhomogeneous
bifurcating Markov chains indexed by a binary tree. As a corollary, we obtain
the shannon-McMillan theorem for these Markov chains with finite state space. 相似文献
25.
阐述了利用北京大学26MHz 300keV整体分离环高频四极场(ISR RFQ)加速器同时加速同荷质比正负离子的研究结果.分别用O+和O-离子的连续束以及脉冲束同时注入,均实现了RFQ加速器对同荷质比正负离子的同时加速.用快靶测得的经RFQ腔同时加速后形成的O+及O-离子微脉冲束与预想的正负氧离子微脉冲束相位关系完全一致.证实了同时加速时得到的氧离子束总和明显高于单加速一种离子时得到的氧离子束.在国际上首次实现了用RFQ加速器同时加速同荷质比的正负离子. 相似文献
26.
MingZhen Ma HaiTao Zong HaiYan Wang YanPeng Qi SunXing Liang AiJun Song WeiGuo Zhang Qiang Wang XinYu Zhang Qin Jing Gong Li RiPing Liu 《中国科学G辑(英文版)》2008,51(4):438-444
The fluidity and filling ability of glass-forming Zr-based alloy melt in copper mould were investigated both theoretically
and experimentally. The major factors which affected the flowing behavior of the metallic melt in the mold were determined,
which provides the foundation for overcoming the contradiction between the filling and formation of amorphous alloy during
the rapid cooling process of the metallic melts. The casting factors to prepare a metallic ring were discussed and selected.
As a result, a Zr-based bulk metallic glass ring was prepared successfully.
Supported by the National Natural Science Foundation of China (Grant No. 50731005), SKPBRC (Grant No. 2006CB605201/2007CB616915),
PCSIRT (Grant No. IRT0650), the Natural Science Foundation of Hebei Province of China (Grant No. E2004000209), the Scientific
Research Foundation of Education Department of Hebei Province of China (Grant No. 2004464), and the Experts and Scholars Fund
of Personnel Department of Hebei Province, China (Grant No. 2003) 相似文献
27.