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191.
192.
The fabrication of monolayers composed of nordihydroguaiaretic acid (NDGA), and hybrid films composed of NDGA-flavin adenine dinucleotide (FAD) adsorbed films was performed in neutral aqueous solutions to produce electrochemically active thin films exhibiting one and two redox couples, respectively. An electrochemical quartz crystal microbalance and cyclic voltammetry were used to study the in situ growth of the NDGA and hybrid NDGA/FAD film monolayers. The NDGA modified film electrocatalytically oxidized NADH, ascorbic acid, dopamine, and N2H4 in neutral aqueous solutions. Well-separated voltammetric peaks were observed for dopamine and uric acid mixtures, and also for ascorbic acid and uric acid mixtures using the NDGA/GC modified electrode. When transferred to various aqueous buffered solutions, the two redox couples of the NDGA/FAD hybrid film and their formal potentials were observed to be pH-dependent. The electrocatalytic oxidation and reduction of NADH and NAD+ by a NDGA/FAD hybrid film in neutral aqueous solutions was carried out, and the electrocatalytic oxidation of NADH was performed using a NDGA/FAD hybrid film. 相似文献
193.
为了实现一定气体流速的离子风,设计了一种新型的阵列式三排3 ×3垂直放置的针-柱电极结构放电装置.在针-柱之间间距为3mm、排与排之间间距为8 mm、镇流电阻12 MΩ、放电电阻12 MΩ、测试电阻1 kΩ、大气压环境、室温、无外部通入气流时,阵列式针-柱电极实现了稳定的电晕放电,并通过示波器记录的放电波形、数码相机拍摄的发光图像以及放电伏安特性曲线进行了验证.同时,随着阵列式排数的增加,放电电流变大,离子风风速也随之增大.该针-柱结构易于用MEMS工艺加工制作,可应用于便携式分析仪器中. 相似文献
194.
扩散加权图像中的噪声为莱斯噪声并且图像本身含有丰富的边界信息,因而要求对DWI图像有效降噪的同时,能够较好地保留图像的边界信息。由于BEMD算法可将图像分解为细节图像及余项图像,其所分解的细节图像包括DWI图像的边界信息以及主噪声,而余项图像则描述图像的趋势信息。因此,提出一种将二维经验模态分解算法与改进的维纳滤波器相结合的降噪算法,并将该算法应用于DWI图像的降噪中。通过实验,将所提出的算法与其他算法应用于DWI图像的降噪处理,并通过对结果的分析比较证明所提出的算法能够更有效地对DWI图像进行降噪处理。 相似文献
195.
196.
197.
K. Bouzek R. Chmelíková M. Paidar H. Bergmann 《Journal of Applied Electrochemistry》2003,33(2):205-215
A study was made of the influence of process parameters on the mass-transfer coefficient in a flow-through cell with a cascade of rotating drums partially filled with conductive particles (called the vertically moving particle bed). Copper deposition from an acidic sodium sulphate solution was used as the model reaction. To evaluate the experimental data a macrohomogeneous mathematical model of potential and current density distribution inside the cell was developed. The electrolyte flow distribution between the empty space above the particle bed and through the bed was evaluated. On the basis of these results the following correlation is proposed:
where the first term corresponds to the packed bed electrode and the second term represents the contribution of bed rotation. It is valid for bed porosity of 45%, cathode drum rotation rates between 0.047 and 0.120 Hz (i.e., 2.8 to 7.2 rpm) and a Re
p range of 0.003 to 0.013. 相似文献
198.
Utilising a pseudo-reference electrode in polymer electrolyte fuel cells allows for the separation of anodic and cathodic contributions to the entire cell impedance. Modelling the impedance responses by using equivalent circuits inhibits the investigation of kinetic parameters of the basic electrochemical reactions, which take place at single electrode-electrolyte interfaces. Therefore, we evaluate single electrode impedance measurements by a kinetic model, which is based on specific reaction pathways, either for the oxygen reduction reaction (ORR) or the hydrogen oxidation reaction (HOR). As a consequence, it is possible to obtain kinetic parameters for the specific reaction of interest. Furthermore, the information gained from the single electrode impedance measurements and the kinetic model can give insight into single reactions steps. In particular, the ORR has to include a chemical step in the reaction pathway. 相似文献
199.
NaBiO3 crystal of high purity has been synthesized through chemical oxidization. The morphology and thermal stability of NaBiO3 were examined with scanning electron microscope (SEM) and thermogravimetry-differential scanning calorimetry (TG-DSC). The electrochemical properties of MnO2 electrodes with and without doping NaBiO3 were studied through galvanostatic charge/discharge and cyclic voltammetry. The results indicate that the MnO2 electrode doped with NaBiO3 possesses remarkably higher discharge voltage and capacity and better reversibility than the pure MnO2 electrode and Bi2O3 doping MnO2 electrode. 相似文献
200.
对烷氧基苯甲脒盐酸盐的制备 总被引:3,自引:0,他引:3
从对羟基苯甲醛出发,经烷基化,肟化,脱水及Pinner法合成了5种对烷氧基苯甲脒盐酸盐,利用FAB-MS鉴定了产物,对Pinner法作了改进,大大缩短了氨解时间。 相似文献