Lag Order and Critical Values of the Augmented Dickey–Fuller Test

Response surface analysis is used to obtain approximate finite-sample critical values for the augmented Dickey–Fuller (ADF) test. Previous studies estimating the critical values for the test have generally ignored their possible dependence on the lag order. This study shows that the lag order, in addition to the sample size, can affect the finite-sample behavior of the test. The result points to the importance of correcting for the effect of lag order in applying the ADF test.     

杂多酸HPWA液相催化合成乙酸正丁酯

本文报导杂多酸HPWA对乙酸正丁酯液相合成反应的催化行为,通过对几种催化剂的催化作用比较、杂多酸HPWA用量不同的催化效果以及杂多酸重复使用效果的实验,发现杂多酸HPWA对乙酸正丁酯液相合成反应的催化作用明显优于硫酸等催化剂,是一种效果良好的液相合成乙酸正丁酯的催化剂。     

界限分析与批判:当代哲学重要的工作方式

"界限分析"是哲学十分重要的一种工作方式,它使哲学摆脱传统哲学观不切实际的自我期待,使哲学在当代知识背景和社会生活语境中重获生机与活力."界限分析"的工作方式可以在"语言"、"知识"、"存在"和"价值"四个基本层面上进行.它集中体现了哲学最为根本的精神气质,即批判性,因而将为哲学的当代合法性提供有力的自我辩护.     

净化美化优化亲商安商富商--营口市投资环境概述

近期,在辽宁经贸代表团赴日赴韩赴港招商中,营口市成绩斐然,分别名列全省第二至三位,一时成为热点亮点彩点.这与营口的优越的投资环境密不可分.     

企业团建必须实现服务企业与服务青年的结合

企业团建要实现服务企业与服务青年的结合,必须坚持党的领导、加强党、政、团联系,坚持青年理想教育的生动活泼、讲求实效,做到寓教育于活动,促使志愿者行动的制度化、规范化、经常化;深入开展青年岗位能手、青年文明号、安全生产、突击生产、创新创效活动;在加强团的基层组织建设、加强团干队伍建设方面,调整团的运作机制以适应企业发展需要。     

汽车悬架球铰总成动态试验台的研制

分析了汽车悬架球铰总成动态试验台的技术特点,阐述了其控制原理和研究路线.     

Patterns in the delay and recovery of fertility in Europe

Using the information provided by the Council of Europe (2002), we analyse the final number of children over several cohorts in 20 European countries. We distinguish between children born before and after the age of 30. One obvious conclusion emerging from the analysis of the data is that the most recent cohorts have fewer children before the age of 30, and more after this age. However, this process of “ageing fertility” is not occurring in the same way across all European countries. Four clear patterns of reproduction can be discerned: Western, Central, Southern and Eastern. While in Western European countries, the fertility “lost” before the age of 30 is recovered afterwards, in the other areas this is not the case. Using the techniques of factor analysis, taking various socio-economic variables, we attempt to show the value of this distinction to study the differences in the strategies of delay and recovery of fertility in the different groups of countries.     

Reduction of control-chart signal variablity for high-quality processes

The design of a control chart is often based on the statistical measure of average run length (ARL). A longer in-control ARL is ensured by the design, but the variance run length distribution may also be large for such a design. In practical terms, the variability in false alarms and true signals may be large. If the sample size for plotting a point is not constant, then the focus is on the average number inspected as against the ARL. This article considers two well-known attribute control chart procedures for monitoring high quality based on the number inspected, and shows how the variability in false alarms and correct signals can be reduced.     

Effects of correlation on fraction non-conforming statistical process control procedures

High-yield production processes that involve a low fraction non-conforming are becoming more common, and the limitations of the standard control charting procedures for such processes are well known. This paper examines the control procedures based on the conforming unit run lengths applied to near-zero-defect processes in the presence of serial correlation. Using a correlation binomial model, a few control schemes are investigated and control limits are derived. The results reduce to the traditional case when the measurements are independent. However, it is shown that the false alarm rate cannot be reduced to below the amount of serial correlation present in the process.     

碳钢贝氏体等温淬火对组织和性能的影响

本文根据作者对４０、６０、Ｔ８、Ｔ１０和Ｔ１２钢试样等温淬火试验研究的已有结果，进一步研究了在最佳等温温度等温不同时间后的组织，并对试样进行了拉伸试验。