食品添加剂磷酸中钠含量测定方法研究

由于磷酸中钠的含量极低,又不能过多地稀释,因而受基体和背景以及黏稠度的影响很大,为用火焰原子吸收光谱法测定钠,采用标准加入曲线法测定,并进行了精密度、准确度和检出限的测定试验,以及进行实验室间样品中钠含量的测比对。试验结果表明,该法能够快速、准确地测定磷酸中钠含量,结果令人满意。     

仪器分析双语教学的实践与思考

在两年仪器分析双语教学实践的基础上,对仪器分析双语教学中的若干问题进行了思考和总结。     

磁流变抛光去除函数获取的微分解耦方法

针对非球面光学元件连续变曲率的特点,提出了一种基于平面抛光斑演变获取非球面磁流变抛光去除函数的技术思路。通过分析磁流变抛光机理,建立了磁流变抛光多因素耦合作用模型。基于该模型提出磁流变抛光去除函数获取的微分解耦方法,实现对抛光斑形成机制中的几何因素解耦,发现当工艺条件变化较小时,在空间中的特定点处,去除效率的变化量与工件浸入深度的改变量呈线性关系。实验观测的20个点中,有17处决定系数在90%以上,另外3处在80%以上,峰值去除率和体积去除率演变的决定系数分别达到92%和94%,实验验证了这一结论。     

Study on optical nonlinearities of ZnO-Nb2O5-TeO2 glass with time-resolved four-wave mixing technique

We investigated nonlinear optical properties of ZnO-Nb2O5-TeO2 glass excited by a femtosecond laser with time-resolved four-wave mixing (FWM) technique. The unusual FWM signals were observed in samples with ZnO dopant. The mechanism for the optical nonlinearities was discussed.     

Nonlinear Optics properties of Er2O3- doped 75Nb2O5-20TeO2-5ZnO glasses

We have performed time-resolved degenerate four-wave mixing(DFWM)experiments in 75Nb2O5-20TeO2-5ZnO glasses doped by Er2O3 at different excitation intensities and lattice temperatures.DFWM signalexhibits three peaks at high excitation intensities,where a main peak appears at zero time delay and tworather weak side peaks locate symmetrically at the negative and positive time delay,respectively.Themain peak is attributed to local-field effect and two side peaks are attributed to Coulomb interaction(CI).     

聚合物试剂在研究反应机理中的应用——三相试验法检测反应活性中间体

自从六十年代初期Merrifield开创了固相肽合成方法以来，功能基化聚合物的应用迅速扩展到有机合成、催化反应和分离科学等领域，这些方面已有许多专著和综述发表。本文要介绍的是一种研究化学反应历程的新方法，即用聚合物固载的试剂研究有机反应机理的所谓三相试验法(three-phase test)o     

Study on optical nonlinearities of ZnO-Nb_2O_5-TeO_2 glass with time-resolved four-wave mixing technique

We investigated nonlinear optical properties of ZnO-Nb2O5-TeO2 glass excited by a femtosecond laser with time-resolved four-wave mixing (FWM) technique. The unusual FWM signals were observed in samples with ZnO dopant. The mechanism for the optical nonlinearities was discussed.     

火焰原子吸收法测定血清中三种元素的三种前处理方法比较

本文就火焰原子吸收法测定血清中K、Fe、Mg三种元素常用的三种前处理方法,即用去离子水稀释、用1%硝酸稀释、用硝酸-高氯酸消化进行了比较,并用数理统计方法进行差异显著性测验,证明三种前处理方法所得结果一致。其中1%硝酸稀释法操作简便快速,适于批量样品的分析。     

Wittig反应的研究XXI．ω－唑烯类杀菌剂的合成

用相转移催化Ｗｉｔｔｉｇ反应由１，４－二溴丁烷和三苯瞬合成了ω－溴代烯类化合物，并由此制得了１５种ω－唑烯类化合物，并对部分化合物进行了杀菌活性测定．