掘进机电气系统结构及故障判断

文章论述了掘进机电气系统所采用的控制方式以及保护方式,结合掘进机电气系统原理,提出电气系统故障点分布,进行分析,使维修人员能够快捷地判断和处理故障。     

Business failure prediction using decision trees

Accurate business failure prediction models would be extremely valuable to many industry sectors, particularly financial investment and lending. The potential value of such models is emphasised by the extremely costly failure of high‐profile companies in the recent past. Consequently, a significant interest has been generated in business failure prediction within academia as well as in the finance industry. Statistical business failure prediction models attempt to predict the failure or success of a business. Discriminant and logit analyses have traditionally been the most popular approaches, but there are also a range of promising non‐parametric techniques that can alternatively be applied. In this paper, the relatively new technique of decision trees is applied to business failure prediction. The numerical results suggest that decision trees could be superior predictors of business failure as compared to discriminant analysis. Copyright © 2009 John Wiley & Sons, Ltd.     

如何分析排查计算机网络故障

网络故障是个综合性问题,包括硬件、软件、病毒等方面的问题,这些问题是复杂且普遍的问题。解决网络故障,需要掌握一定的技巧、知识。方法得当便能够迅速、准备的找出故障根源从而解决问题。本文论述了常见网络故障的分析及排查。     

云南省直过民族区受教育程度的统计分析

本文运用观察法、访谈法、问卷法,对云南省怒江区泸水县直过民族这个特殊群体的受教育现状及学习动机进行了深入调查和研究.结果表明,语言障碍、自然条件恶劣、基础建设不完备,是直过民族经济文化发展滞后的主要原因.最后提出实施＂双轨制＂办学法,以激发人们的求学动力,从而培养适合该地区的人才。     

Hierarchical Bayesian Estimation of the Products Reliability Based on Zero-Failure Data

1　IntroductionThezero-failuredataresearchisanewfieldintherecentyears,butitisrequiredurgentlyinpracticalprojects,sotheworkhasmoretheoryandpracticalvalues.Fromthearticle[1]presenting,moreandmoreattentionispaidbyresearchersallovertheworldintheze-ro-fai...     

南海油田海底输油管线失效牺牲阳极的研究

对南海油田某海底输油管线失效的牺牲阳极进行了电化学性能测试、阳极表面溶解形态分析和扫描电镜及能谱分析，并对其溶解产物作了X－射线衍射分析。分析结果表明，阳极失效的原因是其结构存在缺陷，有严重的晶界偏析，从而导致了晶间腐蚀。     

论审计失败及其防范

针对企业的特点、管理当局的品质和态度、会计报表项目的性质及错误发生的频率等情况 ,本着一般与特殊相区别、定性与定量分析相结合的原则 ,讨论了审计失败的可能性及其原因 ,然后在统计分析的基础上 ,合理确定审计风险多发性的环节和区域 ,并根据审计失败的特点和原因 ,提出了具实际操作性的防范技巧和改进方法 .     

煤和瓦斯突出冲击地压危险的电磁脉冲监测

叙述电磁辐射产生机理及测试原理，并利用电磁辐射对煤（岩）破坏前进行实时监测。通过在我国的许多煤矿上的现场应用，检测了电磁辐射技术的可行性及可靠性，证实了该技术对煤矿安全生产、改善工作环境、降低劳动强度有极大的意义。     

Estimation of Parameter in the Case of Zero-Failure Data

l IntroductionFrom the article [l] presenting, the zero-failure data research has been twenty years longand more attention is paid by researchers all over the world. We have got someachievements already. The devclopment of these researches can be found in article L2j'In article [3j, a method dealing with zero-failure data, that is, distribution curvesmethod, is given and has more values. The basic thought is: at first estimation the failureprobability pi = p {Twtt. } at moment l,, then appro…     

P-GB103离心式压缩机油系统常见故障及其处理

P-GB103离心式压缩机油系统对整机的性能起着至关重要的作用。分析了油系统常见的故障及其产生的原因,提出了相应的处理措施,收到了良好的效果。