电动转向及其电子控制

电动助力转向系统结构简单，动作精确，有许多优点。本文主要介绍了电动转向的特点，结构和工作原理。     

FE—1汽油增加剂的研究

本文对一种非铅金属高分子化合物作为汽油增加剂对汽油抗爆性，物理和化学性能，污染物排放性进行了系统研究，结果表明该化合物在一定程度上能提高汽油的抗爆性，而对汽油的昨化学性能没有不利影响，排放中不含有毒的铅污染物，发动机台架和汽车道路试验结果显示汽油添加该种添加剂能提高发动机和汽车的动力性，其经济性也有所改善。     

基于灰靶理论和排放分析的柴油机状态评估

论述了利用废气排放分析进行柴油机状态评估的方法,运用灰靶理论靶心构造原理从多组模式中确定出标准模式,对不同的模式进行靶心接近度计算,实现了对柴油机状态的评估。实例表明,利用灰靶理论可以进行不同排放模式的识别,能实现柴油机状态的准确评估。     

用SPA—ELISA法检测不育症的抗精子抗体

笔者以SPA代替第二抗体采用ELISA法检测不育夫妇和有生育能力夫妇的精液及血液中抗精子抗体共220例,其检测结果,不育组阳性检出率为30.5%,生育组阳性检出率为7.6%,二者比较有显著性差异(P<0.001)。不育组男性阳性检出率为32.5%,女性28.4%,男女比较无显著性差异(P>0.05)。该方法具有操作简便,特异性强,敏感性高,重复性好等优点,是目前诊断免疫不育症的一个较为理想的实验方法。     

Power transformer fault diagnosis model based on rough set theory with fuzzy representation

Objective Due to the incompleteness and complexity of fault diagnosis for power transformers, a comprehensive rough-fuzzy scheme for solving fault diagnosis problems is presented. Fuzzy set theory is used both for representation of incipient faults＇ indications and producing a fuzzy granulation of the feature space. Rough set theory is used to obtain dependency rules that model indicative regions in the granulated feature space. The fuzzy membership functions corresponding to the indicative regions, modelled by rules, are stored as cases. Results Diagnostic conclusions are made using a similarity measure based on these membership functions. Each case involves only a reduced number of relevant features making this scheme suitable for fault diagnosis. Conclusion Superiority of this method in terms of classification accuracy and case generation is demonstrated.