醋酸地塞米松在Nafion修饰玻碳电极上的伏安行为及其测定

１引言醋酸地塞米松为一种抗炎、抗过敏的药物。目前,其含量的测定方法主要有光度法、色谱法等。本文发现醋酸地塞米松在玻碳电极（ＧＣＥ）上有电化学活性,但测定的灵敏度较低。如用Ｎａｆｉｏｎ修饰ＧＣＥ后,氧化峰电流增大两个数量级。２实验部分２．１仪器与试剂ＢＡＳ－１００Ａ电化学系统（美国ＢＡＳ仪器公司）,三电极系统：玻碳电极为工作电极（Ｓ＝１．９２ｍｍ２）,饱和甘汞电极为参比电极,铂丝为辅助电极。醋酸地塞米松（北京生物制品研究所,含量≥９９％）用无水乙醇配制成１．０×１０－３ｍｏｌ／Ｌ的储备液。实验所用…     

Er2O3的光致发光光谱,吸收光谱和Raman光谱

在可见激光的激发下,Ｅｒ２Ｏ３粉晶样品的Ｒａｍａｎ光谱易受Ｅｒ＾３＋光致发光光谱的干扰。本文利用同一Ｒａｍａｎ光谱仪测得Ｅｒ２Ｏ３的高分辨可见光吸收光谱和激发光谱。     

关于实四元数矩阵的数值半径

本文在[1]的基础上研究了实四元数矩阵的数值半径。得到了关于数值半径幂的不等式。C-数值半径的不等式也给出了。因此我们推广了曹重光教授的结果。     

Superconvergence of Finite Element Approximations to Parabolic and Hyperbolic Integro-Differential Equations

1 IntroductionRecently, considerable attention has been devoted to the finite element analysis fOr par-tiaJ illtegro-differential equations, see, fOr example, Yanik and Ftweatherl1], Cannon andLin[2'3] 5 Chen and Shih[4], Lin, Thomee and Wahlbi.I5l ? Thomee and Zhang[6] and ZhangI7j8J.The main tool used for this kind of equations is the mtz-Voterra projection [5'7] as againstttitz projection fOr parabolic equation. In this paPer, we are concerned primarily with theanalysis of knot supe…     

Effect of Substituents on Aggregation Behaviors of Stilbazole and Stilbazolium Derivatives

Stilbazole and stilbazolium derivatives with dialkylaniline as electron pushing substituents and pyridine or pyridinium substituents as electron drawing substituents were synthesized and their aggregation behaviors were studied by UV‐visible, fluorescence and surface photovoltage spectroscopies. Experimental results indicate that the formation of aggregates can be mediated by the electron drawing ability of the substituents introduced for those compounds all bearing strong electron pushing substituent. When the electron drawing substituent is pyridine group, the molecules tend to aggregate in head‐to‐tail manner, whereas the substituent is pyridinium group, the molecules tend to aggregate in face‐to‐face manner. The effect of electron pushing and drawing ability of the substituents on the aggregation behavior is further analyzed in terms of frontier orbital interactions.     

2,5-二疏基-1,3,4-噻二唑/聚邻甲基苯胺复合电极的电化学性能

有机二硫化合物;二疏基噻二唑;锂电池;2;5-二疏基-1;3;4-噻二唑/聚邻甲基苯胺复合电极的电化学性能     

Crystal growth of mixed‐valence ammonium vanadates

A new method has been developed for the synthesis of mixed‐valence ammonium vanadate crystals. Single crystals of (NH₄)₂V₃O₈ were synthesized on a large scale by hydrothermal reduction of NH₄VO₃ in ethanol‐H₂O solutions in the presence of triblock copolymer Pluronic P123. The crystals are shining thin plates with (001) cleavage planes. Calcination of the (NH₄)₂V₃O₈ crystals at 300°C or above resulted in pure phases of V₂O₅. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

Magnetic behaviour investigation on symmetric spin valves of Co／Cu／NiFe and NiFe／Cu／Co

In this paper,we have obtained and investigated the magnetic behaviours of the ferromagnetic layer in the symmetric spin valves of Co/Cu/NiFe and NiFe/Cu/Co by measuring with a vibrating sample magnetometer and analysing in terms of the multi-domain Ising models.It has been found that some magnetic layer can have quite different magnetic behaviours in different structures of spin valves,depending on the properties of the under-layer.In our investigation,we have found that the magnetic behaviour of a Co layer depends mainly on the magnetization of the under-layer,whereas this is not the case for the NiFe layer.     

两个子带占据的In0.53Ga0.47As/In0.52Al0.48As量子阱中填充因子的变化规律

研究了低温(15K)和强磁场(0—13T)条件下, InP基In_053Ga_047As/In_052Al_048As量子阱中电子占据两个子带时填充因子随磁场的变化规律.结果表明,在电子自旋分裂能远小于朗道能级展宽的情况下,如果两个子带分裂能是朗道分裂能的整数倍时,即ΔE₂₁=kω_c(其中k为整数),填充因子为偶数;当两个子带分裂能为朗道分裂能的半奇数倍时,即ΔE₂₁=(2k+1)ω_c/2,填充因子出现奇数. 关键词： 053Ga_047As/In_052Al_048As量子阱')" href="#">In_053Ga_047As/In_052Al_048As量子阱 填充因子 磁输运     

掺铒光纤放大器的优化设计

本文对掺铒光纤放大器优化设计方面的一系列问题进行了理论分析,通过对四十六所提供的掺铒光纤吸收谱的分析,分别计算了在掺铒光纤长度不同及入纤的泵浦功率不同的情况下,最佳的泵浦波长,理论分析了在不同的掺铒半径比的情况下的最佳截止波长,以及在不同的掺铒半径比和不同的掺杂浓度下的最佳掺铒光纤长度.