上转换纳米颗粒荧光寿命测量数据采集与处理

为了测试分析上转换纳米材料(up-conversion nanoparticles, UCNPs)的荧光寿命，设计了一种针对UCNPs进行荧光寿命信号数据高速采集并测量输出的系统。该系统通过MATLAB编写虚拟原始荧光信号并完成滤波和数据拟合，将数据程序脚本嵌入LabVIEW中进行计算和处理，在上位机显示荧光信号波形、拟合数据波形、荧光个数、荧光寿命以及寿命极值等。研究结果表明:该系统软件仿真和数值计算模拟取得了基本一致的结果，在背景噪声一定的情况下，两者误差在3%以内，具有良好的稳定性和准确性。本研究工作对UCNPs荧光寿命测量系统的研发有一定指导价值。     

锆-苯炔参与的金属杂环的形成及其在有机合成中的应用

锆-苯炔是一类非常重要且具有高度反应活性的金属有机配合物.其与烯、炔、醛、酮、腈等不饱和底物反应时,通过调节底物的取代基、化学计量比、配体结构以及反应条件等,可以得到多种形式的锆杂环类化合物.该锆杂环进一步与亲电试剂反应可以构筑结构丰富多样的有机化合物.对锆-苯炔的合成方法及其参与的金属杂环的形成与后续反应等方面进行了综述,并对锆-苯炔在有机合成化学领域的发展前景进行了展望.     

求解单变量无约束优化问题的一类新割线法

本文基于分式逼近提出了一类求解单变量无约束优化问题的新割线法,给出并证明了该方法的收敛阶是(√2+1).并进一步对新方法的性能进行了分析,给出了新方法、经典的牛顿法和其他修正的割线类方法解单变量无约束优化问题的数值实验.理论和数值结果均表明新的割线法是有效的.     

“小人”的价值

8月份最火的商业大片不是《唐山大地震》，而是现实版的《国关争夺战》。前者只不过是超过6亿的票房；后者却是数百亿资产的控制权。     

CeO2-ZrO2复合氧化物的制备及协同抛光性能

Sub-micrometer ultra fine CeO₂-ZrO₂ mixed oxides have been prepared by milling solid cerium carbonate and zirconium oxy-chloride with ammonia and followed by filtering, drying and calcining procedures. The effects of Ce/Zr molar ratio, milling time and calcining temperature on the phase composition, particle size and morphology, surface charge, as well as the polishing property were investigated. The results show that the mixed oxide calcined at 1 000 ℃ is composed of cubic ceria doped with zirconium and tetragonal zirconia doped with cerium, and the phase composition varies with calcination temperature and the Ce/Zr molar ratio. The monoclinic zirconia is observed when decreasing calcination temperature and shortening milling time, demonstrating that milling and calcining can force the phase transformation from monoclinic zirconia to cerium stabilized tetragonal zirconia and zirconium doped cubic ceria solid solutions. The removal rate for the optical glass polishing varies with Ce/Zr molar ratio. A synergetic polishing effect is found when Ce/Zr molar ratio below 4, and the optimal Ce/Zr molar ratio is 1∶1. At the same time, the cubic ceria content, density, particle size and surface charge all increase when calcination temperature increasing from 800 ℃ to 1 100 ℃. However, the particle morphology changes from disperse quasi-sphere to irregular aggregation and the maximal removal rate for optical glass polishing lies at 1 000 ℃.These facts show that the polishing property of the synthesized ceria-zirconia mixed oxide is affected by the particle physical characteristics comprehensively.     

Synthesis and Structure of a New Copper(II) Complex Cu(C_(13)H_9N_3O_2Br)_2.H_2O

1 INTRODUCTION Owing to their biological activities and chemical/industrial versalities, considerable attention has been continually attracted to metal-hydrazine complexes. For instance, Schiff base hydrazine and its analogues have been well studied in order to better understand the action mechanism of Vitamin B6-containing enzymes[1~3]. Six-coordinated copper(Ⅱ) complexes are of considerable interest, mainly due to their coordination geometry and spectroscopic properties[4]. Due to th…     

玻璃掺杂量子点的倍频效应产生的理论研究

应用统计理论和量子力学理论对量子点掺杂的倍频效应产生的机制与量子点倍频光的电极化率与量子点的尺寸大小的关系进行了理论研究，结果较好地解释了实验所观察到的规律。