汞-头孢唑林钠体系中汞的分光光度法测定

研究了汞与头孢唑林钠的显色反应，在pH=3．8的HAc-NaAc缓冲溶液中，汞（Ⅱ）与头孢唑林钠形成1：1的配合物，其最大吸收波长位于530nm处，汞（Ⅱ）的浓度在0～20mg／L范围之间符合郎伯比耳定律。     

Li1xNaxV3O8电极在硫酸锂-水-乙醇体系中的电化学性能

A series of Lil-xNaxV3O8 materials was prepared by solution reaction followed by calcination method and their electrochemical performances in 2 M LieSOa-water-ethanol solution as negative electrodes for aqueous electrolyte lithium ion battery were studied and compared each other. X-ray diffraction analysis revealed that partially substituting sodium for lithium in LiV3Os could increase the interlayer distances of （100） plane. Cyclic voltammetric experiments have demonstrated that the Li^＋ insertion and extraction kinetics of Li0.7Na0.3V3O8 is superior to that of LiV3O8. Charge/discharge results showed that the discharge specific capacity of Li0.7Na0.3V3O8 electrode is higher than that of LiV3O8 electrode.     

基于直接寻找法的电阻抗断层成像

Solution to impedance distribution in electrical impedance tomography （EIT） is an ill-posed nonlinear inverse problem. It is especially difficult to reconstruct an EIT image in the center area of a measured object. Tikhonov regularization with some prior information is a sound regnlarization method for static electrical impedance tomography under the condition that some true impedance distribution information is known a priori. This paper presents a direct search method （DSM） as pretreatment of image reconstruction through which one not only can construct a regularization matrix which may locate in areas of impedance change, but also can obtain an initial impedance distribution more similar to the true impedance distribution, as well as better current modes which can better distinguish the initial distribution and the true distribution. Simulation results indicate that, by using DSM, resolution in the center area of the measured object can be improved significantly.     

纳米储氢合金Ml0.7Mm0.3Ni3.7Co0.7Mn0.4Al0.2制作的储氢电极的电化学性能

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　Ｉｔｉｓｗｅｌｌｋｎｏｗｎｔｈａｔｍｅｔａｌｈｙｄｒｉｄｅｓａｒｅａｎｉｄｅａｌｍｅｄｉｕｍｆｏｒｈｙｄｒｏｇｅｎｓｔｏｒａｇｅｄｕｅｔｏｔｈｅｉｒｈｉｇｈｄｅｎｓｉｔｙａｎｄｈｉｇｈ ｐｕｒｉｔｙｏｆｈｙｄｒｏｇｅｎ .Ｈｏｗｅｖｅｒ ,ａｌｌｋｎｏｗｎｃｏｎｖｅｎｔｉｏｎａｌｍｅｔａｌｈｙｄｒｉｄｅｓ ,ｉｎｃｌｕｄｉｎｇｉｎｔｅｒｍｅｔａｌｌｉｃｃｏｍｐｏｕｎｄｓＡＢ5,ＡＢ2 ,ａｎｄＡＢ ,ｈａｖｅｒｅｖｅｒｓｉｂｌｅｇｒａｖｉ ｍｅｔｒｉｃＨ ｄｅｎｓｉｔｉｅｓｎｏｍｏ…     

含油有机废水的电化学除油褪色

采用电化学净化的方法对模拟废水进行除油褪色处理，分别从电解电压、电解时间等方面进行条件实验，结果表明：在室温下，该模拟废水电化学除油褪色的最佳条件是电压为6V，电解时间为20min．     

变温条件下光纤拉曼光谱测试及其意义

对某种光纤在温度范围从-70℃到70℃进行了变温拉曼光谱测试。实验结果表明，光纤的拉曼光谱非常稳定，几乎不随温度变化，说明该光纤化学结构在实验温度范围内能够保持稳定，暗示了光纤质量在实验温度范围内是可以保证的。因此，实验证明拉曼光谱可以作为检测光纤质量的一种有效手段。     

酞菁铜的电化学性质研究

文章按文献所述方法制备酞菁铜粉体,制备了酞菁铜膜电极,用循环伏安法研究了它的电化学性质。在0.1mol/L KCL＋0．01 mol/L[Fe(CN)6]3-的溶液中,酞菁膜电极上可以进行可逆的电荷传递,并对氧还原有催化作用。     

高压输电线路铁塔电化学腐蚀特性研究

通过对高压输电线路铁塔主架角钢在不同pH值、环境温度及所受应力下的Tafel曲线测定，研究了镀锌的Q215钢材料的腐蚀特性．结果发现：随着温度升高，试样的自腐蚀电位降低，易腐蚀．在同一温度，随着pH值升高，腐蚀速度先减缓后加快，pH=3．2时腐蚀速度最慢，抗蚀性最好．在酸雨环境中，铁塔腐蚀速度受温度影响最大，随温度升高腐蚀速度加快，同时随着应力增大腐蚀速度增高．     

心脏神经症患者的心功能特点

目的:探讨心脏神经症患者的心功能特点.方法:采用心阻抗法检测46例心脏神经症患者和50例健康成年人的心功能各项指标.结果:心脏神经症患者的SV、CO、CI、HI和AC均明显低于健康对照组(P＜0.01),而TPR明显高于对照组(P＜0.01),而且心脏神经症患者的心室舒张功能显著低于正常对照组.结论:心脏神经症患者的心脏收缩和舒张功能均减退.     

基于多级BP神经网络的EIT阻抗变化位置的确定

Electrical impedance tomography (EIT) is a new computer tomography technology, which reconstructs an impedance (resistivity, conductivity) distribution, or change of impedance, by making voltage and current measurements on the object's periphery. Image reconstruction in EIT is an ill-posed, non-linear inverse problem. A method for finding the place of impedance change in EIT is proposed in this paper, in which a multilevel BP neural network (MBPNN) is used to express the non-linear relation between the