γ辐照PET的结构变化与偶极热松弛运动的研究

大剂量(>50Mrad)γ辐照使PET分子链断裂并导入含氧的苯环基团。短路热释电流温度谱显示α峰随辐照剂量增大向低温移动,被冻结的大分子主链链段偶极热松弛活化能和热松弛时间常数受辐照剂量的影响较小。     

毕奧-沙伐尔定律与稳恒磁场方程

毕奥-沙伐尔(Biot-Savart)定律定量概括了稳恒电流元矢量产生磁场的规律,同时又描绘了稳恒电流磁场的分布特征.因此,毕奥-沙伐尔定律成为稳恒磁场方程的重要理论基础.     

光激瞬态电流谱方法中激发光强度等因素对结果的影响

本文讨论了用光激瞬态电流谱测量半绝缘材料中深能级时,所加电压的极性、光强的变化等因素对结果的影响。对Martin等人提出的判断陷阱类型的方法进行了分析,在此基础上提出了一种新的方法。并给出了由光强变化而引起的能级位置的测量误差的修正方法。     

Application of triple potential step amperometry method for quantitative electroanalysis

A novel quantitative electroanalysis method, triple potential step amperometry (TPSA), was developed and explained with an example of nitrobenzene analyzing in water. The selectivity of TPSA was im- proved by controlling the potential step within a narrow interval and using enzyme-modified electrode, the narrow potential step makes the method avoid most interferents, and enzyme-modified electrode can enhance the response of target substance selectively. The peak area was investigated for quanti- tative calibration, such as nitrobenzene concentration showing a linear relation with the peak area, with the correlation coefficients being 0.9995. The t-test and F-test were applied to evaluating the reliability of TPSA, the results showed that there was no evidence of systematic error for TPSA, and the method was of no significant difference from CV. The merit of fast detecting and few potential changing times make the TPSA suitably applicable to low-cost automatic monitoring equipments.     

绝缘子泄露电流在线检测与数字信号处理综述

评述了高压绝缘子泄漏电流的特性,利用功率谱识别泄漏电流信号的频域特征的方法的优劣,提出了利用专家系统和模糊理论设置隶属度的方法,获取多信号参量来综合判断,以提高绝缘子在线检测的可靠性和准确度.     

PE薄膜电导非线性回归分析

该文对ＰＥ薄膜的电导特性的实测数据进行了非线性回归分析，得出了三种模型。分析三种模型后可得有关项的物理意义，并可得到欧姆传导、空间电荷限制电流、隧道电流及其相互间的制约作用的物理实质。     

电动阀门的过流限扭控制

通过对异步电机堵转电流的研究分析,得出阀门过扭与过扭电流的对应关系。通过检测并识别定子电流方法,对电动阀门实施过扭控制。在 DFD-I型阀门电动装置中应用这种控制方法,获得满意的效果。     

超低hFE温度系数晶体管研制

采用poly-Si(n )/UTSiO2/n -Si/P-Si发射结构，研制出参数与常规晶体管相近，能长期稳定工作，在－55－100度温度范围内，hFE温度系数小于20％的硅晶体管。