Pretest-treatment interaction effects in attitudinal studies.

It is difficult to determine from the pretest-treatment-posttest design whether a significant treatment effect is due to the experimental variable or to an interaction between pretest and treatment. Using a 5-group design, 156 introductory psychology students were exposed to a provivisection tape, and attitude changes on a questionaire were examined. Statistical analysis revealed the expected significant treatments effect, but the pretest by treatment interaction was nonsignificant. It was concluded that "the administration of a pretest does not necessarily sensitize an individual so that his reaction to a given treatment is differentially affected." 27 refs. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

电解铝项目地基基础前期试验应用分析

对电解铝行业的地基基础前期试验的应用进行了分析,分别从场地地质状况、前期试验及结果等方面进行了应用性试验,通过对各项数据的分析研究,得出了电解铝项目地基基础可靠分析的结果,并提出了合理的建议,解决了公司该方面的实践经验技术空白。     

采用SLPC可编程调节器实现电厂主汽温度预报控制

本文从模型算法控制（MAC）理论出发，推出了简化模型预报控制的广义形式（GSPC），按用这种计算机可编程调节器实现电厂主汽温度预报控制。     

Power in randomized group comparisons: The value of adding a single intermediate time point to a traditional pretest-posttest design.

Adding a pretest as a covariate to a randomized posttest-only design increases statistical power, as does the addition of intermediate time points to a randomized pretest-posttest design. Although typically 5 waves of data are required in this instance to produce meaningful gains in power, a 3-wave intensive design allows the evaluation of the straight-line growth model and may reduce the effect of missing data. The authors identify the statistically most powerful method of data analysis in the 3-wave intensive design. If straight-line growth is assumed, the pretest-posttest slope must assume fairly extreme values for the intermediate time point to increase power beyond the standard analysis of covariance on the posttest with the pretest as covariate, ignoring the intermediate time point. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Correction to Venter et al. (2002).

Reports an error in the original article by A. Venter et al (Psychological Methods, 2002[Jun], Vol No. 7[2], 194-209. On page 202, there were 2 errors. Appendix B correctly shows that Equation 17 and 18 should read as indicated here. (The following abstract of this article originally appeared in record 2002-13431-003.) Adding a pretest as a covariate to a randomized posttest-only design increases statistical power, as does the addition of intermediate time points to a randomized pretest-posttest design. Although typically 5 waves of data are required in this instance to produce meaningful gains in power, a 3-wave intensive design allows the evaluation of the straight-line growth model and may reduce the effect of missing data. The authors identify the statistically most powerful method of data analysis in the 3-wave intensive design. If straight-line growth is assumed, the pretest-posttest slope must assume fairly extreme values for the intermediate time point to increase power beyond the standard analysis of covariance on the posttest with the pretest as covariate, ignoring the intermediate time point. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Learning factors as determiners of pretest sensitization.

70 S in 4 general psychology sections were randomly assigned to different treatment conditions. After being read a summary of the story of a film, 2 groups were asked to summarize it. 1 group viewed the film 12 days later. 1 group had neither the summarizing experience nor saw the film. All 4 groups had the posttest 12 days after being read the story. A pretest sensitization operating above the effect of the treatment condition was shown; however, it presumes some degree of learning in the pretest. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

EMC预测试软件在测试整改中的应用及实现

针对电磁兼容重复性测试整改耗时耗力且不便比对整改措施的问题,采用VC++和ACCESS数据库开发了EMC预测试软件.分析了软件的工作流程、体系结构、数据库结构,阐述了历史曲线比较、坐标变换等针对整改的功能实现.该软件在完成电磁兼容指标的自动测试后,还能够比对整改数据,帮助测试人员分析整改措施的有效性,提高了整改的效率....     

Bayesian reliability analysis when multiple early failures may be present

Summary This paper discusses the Bayesian reliability analysis for an exponential failure model on the basis of some ordered observations when the firstp observations may represent “early failures” or “outliers”. The Bayes estimators of the mean life and reliability are obtained for the underlying parametric model referred to as theSB(p) model under the assumption of the squared error loss function, the inverted gamma prior for the scale parameter and a generalized uniform prior for the nuisance parameter.     

延长捷联惯组测试周期的方法研究

针对捷联惯组（捷联惯性测量组合）稳定期较短,测试频繁的问题,在统计分析和弹道仿真的基础上,提出通过验前信息建模预测和射前标定技术相结合的方法来延长捷联惯组的测试周期。实例分析表明,这一方法不会影响捷联惯组的使用精度,同时减少了捷联惯组的测试次数,增加其使用寿命,具有很好的工程应用前景。     

某砌体结构开裂原因分析及加固

通过对某多层砖混住宅楼的检测,对建筑物墙体开裂的原因进行了分析,并综合考虑各种因素对建筑物基础采用锚杆静压桩的加固方法进行了加固.而且采用沿结构外围墙体加设反梁的做法以增加墙体的整体工作性能.