罗敷夸夫中的误注

半个世纪以来,各种选本及大学、中学教材,对罗敷夸夫的几处注释,不够严肃,忽略、歪曲了罗敷的原意,贬损了罗敷夸夫的美学内涵.从罗敷的感情流动和具体的语言环境着眼,本文对罗敷夸夫中的几处误注,作了辨析.对几部大型工具书的注释,本文也提出了不同的见解.     

步进电机的定位及速度控制软件设计

结合步进电机在数控系统中的应用，介绍８０３１ 单片机控制步进电机的方法及实现步进电机的精确定位、换向和速度控制的软件设计。     

高旋仪步进电机可变微分技术

本文着重讨论新研制的高温高压泥装旋转拈度、失水仪中步进电机微分技术，用以解决低转速下仪器的测量精度问题。     

社会工作研究方法教学与实践模式探讨

社会研究方法和社会工作的学科性质决定,社会工作研究属于应用研究,理论与实践并重,实践性是其最为突出的特色。社会工作研究与社会工作实务紧密相关,资料分析只是研究的基础,推动实务才是其主要内容。笔者经过几年来的教学与实践活动,总结出一套基于研究过程的链式教学和课内课外实践相结合的不断进阶式的教学实践模式,形成教与学的多维互动。     

Change Point Estimation of Multivariate Linear Profiles Under Linear Drift

In this paper, maximum likelihood estimators (MLE) for both step and linear drift changes in the regression parameters of multivariate linear profiles are developed. Performance of the proposed estimators is compared under linear drift changes in the regression parameters when a combined MEWMA and Chi-square control charts method signals an out-of-control condition. The effect of smoothing parameter of MEWMA control charts, missing data, and multiple drift changes on the performance of the both estimators is also evaluated. The application of the proposed estimators is also investigated thorough a numerical example resulted from a real case.     

Optimal simple step stress accelerated life test design for reliability prediction

A step stress accelerated life testing model is presented to obtain the optimal hold time at which the stress level is changed. The experimental test is designed to minimize the asymptotic variance of reliability estimate at time ζ$\zeta$. A Weibull distribution is assumed for the failure time at any constant stress level. The scale parameter of the Weibull failure time distribution at constant stress levels is assumed to be a log-linear function of the stress level. The maximum likelihood function is given for the step stress accelerated life testing model with Type I censoring, from which the asymptotic variance and the Fisher information matrix are obtained. An optimal test plan with the minimum asymptotic variance of reliability estimate at time ζ$\zeta$ is determined.     

提高专业英语教学质量的探讨

针对目前理工科高校本科阶段的专业英语课程的特点,首先论述了在课程内容、教学方法、教学手段等教学环节的改革措施,其次,针对该课程的教学特点,提出如何培养学生学习的积极性和主动性,以及创新能力、实践能力.     

论灾后重建中的党内民主建设

灾后重建中党的建设特别是党内民主建设先行一步,指相对于其他重建工作,党的建设应该以新的思路及早谋划安排;相对于其他非地震灾区,灾区党的建设更应率先创新,力图走出一条新路;相对于其他一般地区,绵阳作为中国科技城,其创新的理念理应在党的建设上得到体现;相对于其他党建任务,北川等极重灾区完全可以在党的建设特别是党内民主建设上迈出更大步伐。先行一步重点在于“四个致力于”,遵循原则在于“四个着眼于”,保障条件在于“四个依赖于”。     

个人破产制度三论

将破产主体扩大至个人已是我国破产立法大势之所趋 ,但个人破产制度尚有一些问题需要在理论和实践中进一步认识。本文探讨了个人破产的条件、个人财产的范围以及破产者行为能力的限制等三个问题 ,以陋解就教于诸方家     

PREDICTION FOR EXPONENTIAL LIFETIMES BASED ON STEP-STRESS TESTING

ABSTRACT

This paper presents methods for constructing prediction limits for a step-stress model in accelerated life testing. An exponential life distribution with a mean that is a log-linear function of stress, and a cumulative exposure model are assumed. Two prediction problems are discussed. One concerns the prediction of the life at a design stress, and the other concerns the prediction of a future life during the step-stress testing. Both predictions require the knowledge of some model parameters. When estimates for the model parameters are available, a calibration method based on simulations is proposed for correcting the prediction intervals (regions) obtained by treating the parameter estimates as the true parameter values. Finally, a numerical example is given to illustrate the prediction procedure.