用电容和电导测量法研究SiNx/nc-Si/SiNx双势垒结构界面特性

利用等离子体增强化学气相沉积(PECVD)技术,淀积a-SiNx/nc-Si/a-SiNx不对称双势垒存储结构.通过电容和电导测试研究结构的界面态特性.实验结果表明,采用PECVD方法制备的不对称存储结构的界面特性良好,其界面态密度为3×1010 cm-2eV-1.

电导法测量初浓度不等时乙酸乙酯皂化反应速率常数

根据电导理论导出强电解质稀溶液的电导与浓度关系式中比例系数M_(?)的表达式,阐明了M_(?)的物理意义、影响因素和可视为常数的条件.提出初浓度不等时皂化反应速率常数的简化电导测量法,只需测量电导池常数、L_0和L_(?)即可求算速率常数.

SDD型数字电导仪改进设计

本文针对SDD型数字电导仪存在的问题，提出改进设计方案，采用双极性脉冲电导测量法代替电容补偿法，达到在全量程范围内消除电极极间电容和极化电容所造成的测量误差。本设计以8098单片机作为控制器和处理器。简化了电路结构，提高了控制能力，增强了仪器功能。

一种新颖的致密膜针孔检测方法

本文报导了一种新颖的致密膜针孔检测方法。其基本原理是根据致密膜上存在针孔时,所引起的膜材料的电性能变化。对一系列经过仔细制备,具有不同孔径针孔的高分子致密膜样品进行了测定。研究了实验条件对此方法检测有效性的影响。实验结果表明实验数据与根据针孔孔径测定结果的计算值很好的相符。考察了此方法用于动态检测的可行性。结果证明,电导测量方法提供了一种简便、快速、灵敏,直观的致密膜针孔检测方法。

铅酸蓄电池维护与测试方法的发展

铅酸蓄电池的性能状态最终体现在电池的容量与落后状态上，通过电池的电压、内阻可以在一定程度上反映出电池的好坏，当电池放电到一定程度后，其电压值便开始明显降低。因此，在早期的电池维护中，由于测试仪器的匮乏，工程师普遍采用万用表对电池电压进行测量，通过电压高低来定性电池性能的好坏。

Characterization of the thermal conductivity of La0.95r0.05CoO3 thermoelectric oxide nanofibers

Thermoelectric oxide nanofibers prepared by electrospinning are expected to have reduced thermal conductivity when compared to bulk samples. Measurements of nanofibers＇ thermal conductivity is challenging since it involves sophisticated sample preparation methods. In this work, we present a novel method suitable for measurements of thermal conductivity of a single nanofiber. A microelectro- mechanical （MEMS） device has been designed and fabricated to perform thermal conductivity measurements on a single nanofiber. A special Si template was designed to collect and transfer individual nanofibers onto a MEMS device. Pt was deposited by a focused ion beam to reduce the effective length of a prepared nanofiber. La0.95r0.05CoO3 nanofibers with diameters of 140 run and 290 run were studied and characterized using this approach at room temperature. Measured thermal conductivities yielded values of 0.7W-m 1-K-1 and 2.1 W.m-I＇K-1, respectively. Our measurements in La0.95r0.05CoO3 nanofibers confirmed that a decrease of linear dimensions has a profound effect on its thermal conductivity.