Synthesis and structure of a novel complex [LCo(OH)2(HCO3)CoL]2[(NC)5Cr(CN)Cr(CN)2].4H2O

A novel complex containing a (μ-bicarbonato)-bis(μ-hydroxo)dicobalt(II) cation and a (μ-cyano)dichromium(III) anion has been obtained and characterized by single crystal X-ray diffraction. The cations have a confacial bioctahedral structure and the anion contains an octahedral Cr(CN)₆³⁻ unit bridging to the second Cr which has trigomal planar geometry.     

Synthesis,spectral and magnetic properties of binuclear copper(II)/nickel(II) and copper(II) complexes bridged by glyoximate groups

Three new dinuclear complexes, [(tmen) (H2O)2Ni (Hdmg)(dmg)Cu]·ClO4, [(dien)(H2O)Ni (Hdmg)(dmg) Cu]·ClO4 and [(tmen)Cu(Hdmg)(dmg) Cu] ClO4·H2O (H2dmg=dimethylglyoxime, tmen=tetramethylene diamine), have been prepared. Variable-temperature- magnetic susceptibility measurements (75–300K) on the complexes reveal the presence of intramolecular antiferromagnetic interactions through the oximate bridges. The formation of mononuclear, dinuclear complexes has been confirmed by spectrophotometry.     

Norm inequalities related to operator monotone functions

Let A,B be positive semidefinite matrices and any unitarily invariant norm on the space of matrices. We show for any non-negative operator monotone function f(t) on , and for non-negative increasing function g(t) on with g(0) = 0 and , whose inverse function is operator monotone. Received: 1 February 1999     

RIBLL中的TOF测量

描述了一种为兰州放射性核束流线(AIBLL)研制的时间拾取装置.次级束引起闪烁薄膜发光,椭球面镜聚焦,光电倍增管读出,CAMACTDC记录次级束的飞行时间.其时间分辨可以达到140ps,计数率可以达到10⁸pps.     

无穷维L1空间至连续函数空间的等距逼近问题

证明了无穷维Ｌ~１空间至连续函数空间的等距逼近问题的回答是否定的．     

一类赋p范空间上的等距扩张问题

该文讨论了Ｌ~ｐ（Ω,Ｘ）（０＜ｐ＜１）的一类子空间上的单位球面等距扩张问题．     

完备非紧具非负曲率流形之拓扑结构

本文给出完备非紧具非负曲率的Ｒｉｅｍａｎｎ流形具有限拓扑型的一个简单证明     

激光二极管泵浦的再生放大器技术研究

 对高功率激光二极管泵浦的环形再生放大器进行了理论分析和数值模拟计算,并做了详细的实验研究。得了放大倍数约为10⁶、输出脉冲能量为0.35mJ、输出稳定性优于5.0%(峰值)的实验结果。     

基于束间动态干涉的快速匀滑新方法

针对高功率激光装置中靶面辐照均匀性的高要求,提出了一种利用束间动态干涉改善辐照均匀性的快速匀滑方法.基本原理是利用共轭相位板阵列对存在一定波长差的多束激光附加相位调制,从而使各子束在远场两两相干叠加以产生动态的干涉图样,进而引起焦斑内部散斑的动态扫动,在ps时间内抹平不均匀性.以典型惯性约束聚变装置中的激光集束为例,通过建立基于束间动态干涉的快速匀滑物理模型,定量分析了相位板类型、相位调制幅度和束间波长差等因素对焦斑动态干涉图样的影响及规律,进而对其束匀滑特性进行了讨论.结果表明,基于束间动态干涉的快速匀滑方法可以有效地实现多方向、多维度的焦斑内部散斑快速扫动,且通过与传统束匀滑技术的联用,可以在更短的时间内达到更好的焦斑均匀性.     

第八届全国固体力学青年学者学术研讨会报告综述

简要介绍了在清华大学召开的第八届全国固体力学青年学者学术研讨会的会议情况,概括总结了与会专家和青年学者所做的学术报告内容,并就固体力学发展所面临的问题和挑战以及学科发展趋势提出了一些思考和建议.