内窥式共聚焦成像系统分析

基于点扩展函数和傅立叶光学理论,推导出系统的相干传递函数,并详细研究了光纤对轴向分辨率的影响.研究结果表明：该系统为相干成像系统,系统的轴向分辨率随光纤半径A的增加而降低.最后,搭建了一套内窥式共聚焦成像系统,并测得光栅样品的共聚焦图像.实验结果表明,该系统具有良好的分辨率.     

Molecular ferroelectrics for efficient perovskite solar cells

During the past decade,the power conversion efficiencies(PCEs)of organic-inorganic hybrid perovskite solar cells(PSCs)have exceeded 25%[1],which is expected to be one of the candidates for the next generation of thin-film photovoltaic technology.Fundamentally speaking,the performance of PSCs mainly depends on the light absorption capacity,defect passivation and photo-induced exciton separation and extraction of perovskite films.Under the light illumination,photo-induced excitons were separated and extracted by the built-in electric field of PSCs.     

氮杂环丙烷化合物在直链淀粉柱上的拆分

在自制的直链淀粉-三(3,5-二甲基苯基氨基甲酸酯)(ADMPC)手性固定相上,对2种氮杂环丙烷对映体进行了手性拆分研究.系统选用了不同种类及不同含量的醇改性剂,详细考察了样品的保留时间和立体选择性.     

水生动物及水产品中硫丹及其代谢物残留量的气相色谱-质谱测定

建立了水生动物及水产品中农药硫丹及其代谢物残留量的气相色谱-质谱(GC-MS)测定方法;样品经溶剂提取、凝胶层析柱净化;以氦气为载气,甲烷气为反应气,程序升温及负化学源(NCI)电离方式,采用气质联用仪在选择离子监测模式下进行快速测定,保留时间和离子相对丰度比定性、外标法定量;方法定量下限为0.004 mg/kg。在鳗鱼、泥鳅、鲶鱼、虾4种样品中添加不同浓度的硫丹时,其平均添加回收率在71%~87%之间,相对标准偏差(n=10)小于10%。     

基于国产仪器研究钨丝原子吸收光谱

用标准的150 W幻灯灯泡的钨丝作原子化加热材料,设计制作了一种新颖的、结构简单的钨丝电热原子化器,同时还设计了该原子化器的电源电路和信号的数据采集电路.该原子化器能的最高原子化温度可达3100 K左右;编写了硬件的控制软件和信号处理的应用软件.用该原子化器将实验室一台火焰原子吸收光谱仪改装成钨丝原子吸收光谱仪,并以铜元素标准溶液和PerkinElmer公司多元素标准溶液对仪器性能作了研究.仪器对铜的检出限为0.0133 μg/mL,线性范围为0.10～4.0 μg/mL;对1.0 μg/mL的铜标准溶液测试的相对标准偏差为RSD=4.1%(测试次数n=10),每次分析所需样品量20 μL.     

荧光法研究对羧基苯偶氮基杯[8]芳烃与诺氟沙星的作用

合成了一种超分子探针对羧基苯偶氮基杯[8]芳烃(简称CPAC).利用荧光光谱法研究了溶液状态下该探针与诺氟沙星(简称NFLX)的相互作用.实验表明,两者之间存在较强烈的相互作用,CPAC与NFLX形成外式包结物,静态猝灭NFLX的荧光,CPAC的杯腔体与NFLX的喹啉环间的疏水作用是主要作用方式.测定了该反应的结合常数(K=6.38×105 L·mol-1)和结合比(n=1).实验发现,小牛胸腺DNA能夺取CPAC-NFLX体系中的CPAC,使NFLX游离,说明超分子化合物CPAC可用于诺氟沙星药物的储存和定点释控.     

All Pure Two-Qudit Entangled States Generated via a Universal Yang-Baxter Matrix Assisted by Local Unitary Transformations

We show that all pure entangled states of two d-dimensional quantum systems （i.e., two qudits） can be generated from an initial separable state via a universal Yang-Baxter matrix if one is assisted by local unitary transformations.     

A study of time over threshold (TOT) technique for plastic scintillator counter

A new charge measurement method, time over threshold (TOT), has been used in some gas detectors lately. Here TOT is studied for TOF system, made of plastic scintillator counter, which can simplify the electronics of the system. The signal characteristics are measured and analyzed with a high quality oscilloscope, including noise, pedestal, signal amplitude, total charge, rise time and the correlation between them. The TOT and charge are related and can be fitted by some empirical formula. The charge measurement resolution by TOT is given and this will help the design of TOF electronics.     

A novel mixed-valence complex containing Co(II)(2)Co(III)(2) molecular squares with 4,5-imidazoledicarboxylate bridges

A heterometallic complex, Na(2)[Co(II)(2)Co(III)(2)(IDC(3-))(4)(bipy)(4)].12H(2)O (bipy = 2,2'-bipyridine), in which mixed-valence tetranuclear squares with imidazoledicarboxylate (IDC(3-)) linkers are tethered into a unique chain through disodium units, is hydrothermally synthesized and structurally and magnetically characterized.