The tubular sensors were made with brass tubes used in thermal power plant and their electrochemical impedance spectroscopy ( eis ) were tested and compared in two kinds of cell ( classical tri - electrode cell and the same material tri - electrode cell ) 采用热电厂实际使用的黄铜管制作管状传感器，利用交流阻抗法在同种材料三电极体系电解池中测量传感器的电化学阻抗谱，并与经典三电极体系电解池下的数值作比较。
The contrast test was processed on eight kinds of cotton fiber , one assortment of ramie and one assortment of glue fiber by two methods respectively , the factors , which influenced the test results , were obtained and the feasible method was put forward 通过对8个品种的棉纤维和1个品种的苎麻纤维、 1个品种的粘胶纤维采用交流阻抗法与烘箱法进行的对比试验，找出了影响测试结果的因素并提出了可行的解决办法。
The results show that mno2 / activated carbon composite electrode materials have better electrochemical kinetic reversibility and ideal capacitor performance than those of - mno2 nh2o or activated carbon electrode by cv , a . c . impedance and galvanostatic charge - discharge tests 循环伏安、交流阻抗以及恒流充放电等测试结果表明复合电极材料比- mno _ 2 ? nh _ 2o或活性炭电极具有更好的电化学可逆性和理想的电化学电容行为。
1 . polybenzidine ( pbz ) was polymerized by using chemical method in organic system and with ( nh4 ) _ 2s _ 2o _ 8 as oxidant , hclo4 as dopant . the electrochemical behaviors of pbz electrode were studied by cyclic voltammetry , charge - discharge test and electrochemical impedance techniques 1 .用化学直接氧化法在乙腈溶液中,以高氯酸为掺杂剂制备了聚联苯胺,用循环伏安,交流阻抗,直流充放电对其电容行为进行了研究,聚联苯胺电极比电容为150f / g 。
Impedance includes resistance and capacity reactance , and this capacity and resistance are parallel connection , the simultaneous reduction of the capacity reactance and resistance will make a . c . impedance reduce more acutely , therefore the sensitivity measured by this way is improved much more 同时交流阻抗包括电阻和容抗，且电阻和电容是并联的，电阻和容抗同时减小必将使交流阻抗减小更多，所以用该方法测试的灵敏度得到了明显提高。
The results show that the data measured in laboratory have the same tendence with those measured in thermal power plant and the annual corrosion rate and polarization resistance and the anticorrosion performance of brass tubes can be evaluated effectively with ac impedance 结果表明，实验室数据与现场测试数据基本吻合，交流阻抗法可以提供凝汽器黄铜管在循环冷却水系统中的年腐蚀速率和极化电阻，帮助现场工作人员及时了解凝汽器黄铜管的腐蚀状况。
Corrosion action slope cable used in cable - stayed bridge in different corrosion medium such as synthesis sea water , solution nacl and simulation acid rain are studied by electrochemical method , for example , linear polarization , tafel extrapolation and ac impedance method 对此,本论文以人造海水、 nacl溶液、模拟酸雨作为腐蚀介质,针对不同类型的钢绞线,采用线性极化法、 tafel外推法和交流阻抗法等电化学方法研究斜拉桥拉索结构中钢绞线在不同介质中的腐蚀行为。
Apart from that , it also anlagse the basic princple of ac impedance measurement , and introduce the design and experiment of handware of the workstation in terms of basic princple of ac impedance measurement . the study of this graduation thesis includs the aspects as follwos : ( 1 ) design of measuring circuit diagram . it is designed for the measurment of usual dynamic potentio - scan , experiment of dynamic potentio - scan 介绍了电化学工作站的三种基本功能和性能指标,电化学交流阻抗测量的原理,并进而提出了电化学工作站的硬件系统结构,构建了电化学工作站的硬件结构设计; ( 2 )下位机的接口电路板和测量电路板设计,在设计中力图提高系统精度、灵活性。
Citric acid , taking the place of hno3 , solutes the substance which does not solute in solution , and it acts as the ligand of metallic ionic and the hydrolysis catalyst of si ( oc2h5 ) 4 , which reduces the pollution caused by no2 which forms at the decompose process of the hot treatment . by changing the means of calcine of the drier gel , choosing the suitable temperature to burn the gel , the high temperature calcine time is shorted , which solves the question of the long period calcine . so the preparation process of the matrix and composite was finished by using more lower temperature than the traditional solid state reaction and more shorter time than the traditional sol - gel process 结果使基质和复合物的制备在比传统的固相反应法低得多的温度下和比常规的溶胶凝胶法短得多的时间里完成；五、对基质及复合物的干凝胶、粉体和烧结体进行了ir 、 dta 、 xrd 、 seni及交流阻抗谱表征，研究结果表明：在溶胶向凝胶的转化过程中同时存在着正硅酸乙酯自身的聚合作用和柠檬酸盐络合物之间的聚合作用：干凝胶向产物粉体的转化在400600c之间进行；基质li 。
The result shows are as following , first , using a . c . impedance measurement to measure the compression sensibility of cfrc can eliminate the polarization effect at the electrode of cfrc specimen and the thermoelectric force of the electrode effectively ; the thermo sensitive effect can be avoided by using little electric current , so the a . c 结果表明：采用交流阻抗法测试cfrc试块的压敏效应可以有效地消除cfrc试块的电极处的极化效应和电极界面的热电动势；采用小电流供电可避免温敏效应，因此交流阻抗法要比直流电阻法稳定性好。
