共查询到20条相似文献，搜索用时 765 毫秒
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黄晓梅 《宁德师专学报(自然科学版)》2007,19(4):357-361
提出一种基于酶催化沉积底物和生物素——亲和素两步放大的超灵敏免疫检测方法.抗体通过单层蛋白A固定到金电极表面,预先处理好的生物素化抗体和辣根过氧化物酶（HRP）标记的亲和素形成的网状复合物作为免疫反应信号的放大探针.在有H2O2存在的情况下,通过辣根过氧化物酶（HRP）催化氧化DAB（3,3’—联苯二胺）在金电极上沉积一层不溶物,引起阻抗的显著增大.该传感器用于人IgG检测,检测下限为1.0×10^-8g.采用法拉第阻抗和压电石英晶体微天平分别表征了该传感器的特性. 相似文献
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测量了烧结SrRuO3 的零场冷却 (ZFC)和加场冷却 (FC)的直流磁化强度和交流磁化率 .交流磁化率 -温度曲线的峰随外加直流偏场的增加向低温方向移动 .继续增加直流偏场 ,一个峰分裂成两个峰 ,其中低温下的一个峰继续向低温方向移动 ,另一个高温处的峰却向高温方向移动 .在不同频率下测量零偏场下的交流磁化率 .随频率的增加 ,峰值减小 ;但峰的位置并没有像以前报道的那样向高温方向移动 .可见 ,烧结SrRuO3 并没有显示自旋玻璃行为 . 相似文献
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The effects of particle size of activated carbon （AC） on its wettability, electrode coating technology and electric chemical performance were studied to assemble nonaqueous electric double layer capacitors （EDLCs） for high power requirements. The results show that the specific surface area and total pore volume of AC decrease from 2 137 m^2/g to 1 683 m^2/g, and 0.95 cm^3/g to 0.78 cm^3/g, respectively, if it is ball-milled for 8 h. The pore size distributions are similar in the range of 0.7 nm to 3.5 nm for different ball-milling time. There exists oxidation on the surface of AC during the ball-milling process and the ratios of O-C=O oxygen compositions increase whereas those of C-O, C=O decrease. The peeling strength of AC coated on current collector is almost inverse proportion with the particle size of AC as well as the resistance of EDLCs, and its capacitance decreases about 6%. 相似文献
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采用N一丁基吡啶六氟磷酸盐EBuPy]PF6和壳聚糖（Chi）作为修饰剂,通过静电吸附作用在玻碳电极表面形成稳定性较强的自组装膜修饰电极[BuPy]PF4-Chi／GC．采用电化学阻抗谱技术和循环伏安法研究自组装膜在K3[Fe（CN）4]-K4EFe（CN）6]溶液中的电化学行为,结果表明：形成的自组装膜对溶液与基底间的界面电子转移有强烈的阻碍作用,氧化还原峰电流与扫速的1／2次方在20～100mV／s的范围内呈良好的线性关系,表明该电极过程受扩散控制．该修饰电极对铜离子有很好的选择性,响应灵敏度相比于未修饰的电极提高60倍,铜离子的溶出线性伏安峰电流与其浓度在1．56×10“～6．25×10-4mol·L-1范围内呈良好的线性关系（R=0．9966）． 相似文献
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作为镍氢电池负极活性物质,储氢合金是影响电极电化学性能的主要因素,对储氢合金进行表面处理可有效提高镍氢电池电极的电化学性能。实验采用电化学方法对储氢合金表面进行镍磷合金修饰处理,通过扫描电镜(SEM)及EDX能谱对电极表面进行了表征分析,测定了处理前后镍氢电池在1.5C和2C下的大电流放电性能,通过交流阻抗和循环伏安曲线对处理后电极进行了评价。测试结果表明,通过电化学修饰镍磷合金,储氢合金电极的大电流放电性能有所提高,电化学阻抗减小,循环寿命增长,有效提高了镍氢电池的性能。 相似文献
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The corrosion process of tinplate in deaerated functional beverage was investigated by using electrochemical impedance spectroscopy (EIS) combined with scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) techniques. The results reveal that the uncoated tinplate shows a poor corrosion resistance and the corrosion type is detinning. During the initial stage of immersion, EIS spectrum consisted of two capacitance arcs with obvious time-constant dispersion effect, which was attributed to the two-dimensional and three-dimensional inhomogeneous distribution of the electrode surface. With the increase of immersion time, the capacitance arc of high frequency shrunk and degenerated, due to the corrosion of tin coating. The pore resistance of tin coating and the charger transfer resistance of substrate, which are determined from the electrochemical equivalent circuit, can be used as the indicators of tinplate corrosion process. The decrease of the pore resistance of tin coating indicates that the corrosion degree of tin layer becomes more severe, whereas the decrease of the charger transfer resistance of substrate implies that the corrosion degree of steel substrate also becomes more severe as the immersion time prolongs. 相似文献
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1 Ｉｎｔｒｏｄｕｃｔｉｏｎ Ｏｗｉｎｇｔｏｉｔｓｈｉｇｈｈｙｄｒｏｇｅｎ ｓｔｏｒａｇｅａｂｉｌｉｔｙ ,ｌｏｗｃｏｓｔａｎｄａｂｏｕｎｄｉｎｎａｔｕｒａｌｒｅｓｏｕｒｃｅｓ ,Ｍｇ ｂａｓｅｄａｌｌｏｙｂｅ ｃｏｍｅｓａｃｏｍｐｅｔｉｔｉｖｅｈｙｄｒｏｇｅｎ ｓｔｏｒａｇｅｍｅｄｉｕｍｗｈｉｃｈｃａｎｂｅｕｓｅｄｉｎＮｉ ＭＨｂａｔｔｅｒｙａｎｄｆｕｅｌｃｅｌｌ.Ｔｈｅｅｌｅｃ ｔｒｏｃｈｅｍｉｃａｌｍｅｔｈｏｄｈａｓｂｅｅｎｕｓｅｄｉｎｔｈｅｓｔｕｄｙｏｆｈｙ ｄｒｏｇｅｎａｔｉｏｎ/ｄｅｈｙｄｒｏｇｅ… 相似文献
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针对很多无线供电应用场合需要保持输出电压恒定的需求,提出了一种高频逆变器前动态调压的恒压输出控制方法。以LCL-S型感应耦合电能传输系统为研究对象,通过阻抗分析法建模,发现通过元器件的参数配置,可使系统输入阻抗为纯阻性,减少无功分量,同时逆变器开关管实现了零电流开通与关断,但此时系统输出电压并不恒定。针对分析结果提出基于模糊自适应PI控制算法的逆变前动态调压控制的恒压输出控制方案,最后搭建了仿真实验平台和实验样机证明了分析结果的正确和控制方案的有效。 相似文献
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高险峰 《福建工程学院学报》2021,(4):342-348
通过对比试验研究了直流、交流方波波形参数(频率、平衡和电压偏移)对埋弧焊焊接效率的影响。结果表明,熔深随着频率的增大而减小,随着平衡和电压偏移的增大而增大?熔敷效率随着平衡和电压偏移的增大而减小。进一步试验证明:直流、交流并用有利于提高焊接生产效率。该研究成果为实际工业应用中埋弧焊成形质量提供了理论依据。 相似文献
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采用覆层测厚仪、SEM、电化学工作站等研究了脉冲占空比和频率对Mg-4Gd-3Y-0．5Zr微孤氧化膜的生长、表面微观形貌和耐腐蚀性能的影响．结果表明,占空比、频率对膜层厚度影响较小;随着脉冲频率的增加,氧化膜袁面微孔数量增多、孔径减小,粗糙度降低;而随着占空比的增加,变化趋势则相反;膜层耐蚀性随频率和占空比的增加均先增强后降低,最佳频率和占空比分别为600Hz、10％． 相似文献
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WANG M. 《浙江大学学报(A卷英文版)》2005,6(12):1386-1393
INTRODUCTION This paper presents different views on electrode modelling in electrical impedance tomography (EIT), which include electric field electrode models—the conventional approach for modelling electrode ge- ometry, electrochemistry electrode models for mod- elling the effects of electrode-electrolyte interface, and the electrode measurement models for modelling the sensing system in the terms of the electronic measurements. Taking the full electrode models into consideration of el… 相似文献
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TheelectricalcharacterizationofSchottkyandp njunctiondiodesasthesimplestdeviceshasbeenanimportantsubjectforoverhalfacentury .WebelievethattheDCcur rent voltage (I V)measurementsarethemosthelpfulmethodstocharacterizetheparametersofdiodesuntilnow .Manytechniques ,foranalysisofI Vplotatforwardbias,areusedtoextractthediodeparameters[1— 17] .However,anI Vplotitselfcanprovidemerelyafinitequantityofinformation ,henceeachtechniquehasitsownlimitationsandisvalidonlyfortoosimpleassumptionsonthediode… 相似文献
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四电极电压补偿测量质子交换膜的导电率 总被引：1，自引：0，他引：1
根据质子交换膜导电的特点,对其电导率的测试方法进行了研究,分析了通常采用的直流电、交流阻抗以及同轴探针测试方法在测量膜电导率时容易产生误差的原因。并设计了一种四电极电压补偿测试系统,能有效地避开电极极化以及仪器高频感应的影响,使测量结果精确可靠。 相似文献
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In order to achieve a modulator with broad bandwidth and perfect impedance match,a novel electro-optical modulator based on GeO2-doped silica waveguides on silicon substrate is designed.The finite element model of the whole electro-optical modulator is established by means of ANSYS.With the finite element method analysis,the performance of the novel modulator is predicted.The simulation reveals that the designed modulator operates with a product of 3 dB optical bandwidth and modulating length of 226.59 GHz-cm,and a characteristic impedance of 51.6 Ω at 1 550 nm wavelength.Moreover,the calculated electrical reflected power of coplanar waveguide electrode is below -20 dB in the frequency ranging from 45 MHz to 65 GHz.Therefore,the designed modulator has wide modulation bandwidth and perfect impedance match. 相似文献
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The paper reports results of investigation on the harmonic detection technique of a complicated power supply system such as
an AC excited generation system, which has a variable fundamental frequency and low order harmonics with rich sub-harmonics
whose frequencies are lower than the fundamental one. The in-phase correlation filtering technique, based on the frequency
shifting principle, is proposed in this paper. Theoretical analysis and experimental results validate the effectiveness of
this technique for the harmonic detections of AC excited generation systems.
Project (No. 59877021) supported by the National Natural Science Foundation of China. 相似文献
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许胜辉 《武汉职业技术学院学报》2011,10(1):69-71,82
对交流（AC）信号进行同步采样,如电网电压和有功功率均方根值,为了测量计算的非同步交流信号（在文10-6[1]的部分）。提出了一种估值测量的数学表达式,它可测量非同步基频交流信号。用该方法测量的结果与高精密仪器测量的结果进行了比较。最后通过仿真实验证实了此方法的有效性和实用性。 相似文献
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针对同轴波导的高频谐波分析问题,结合ANSYS有限元分析软件,建立了同轴波导的有限元模型,并求解散射参数、阻抗和反射系数等数据,得出了磁场强度和电场强度分布,为高效利用计算机仿真软件求解复杂高频电磁场问题提供了参考. 相似文献
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负阻抗变换器的实现与应用研究 总被引：2，自引：0，他引：2
章介绍了由一级运算放大器实现的电流反向型负阻抗变换器，以及它与无源元件联接后，在改变阻抗大小和性质，用作阻抗逆变器和构成负内阻电压源等方面的应用。 相似文献