矩阵秩的下界估计与Schur不等式的改进

研究具有实用价值的关于一般复方阵的非奇准则、秩的下界实用估计,特征值实部和虚部的平方和上界估计,所得结果改进了著名的 Schur 不等式和 Ky Fan-Hoffman 不等式的估计。     

关于当代大学生践行"三个代表"的思考

应站在赢得青年一代的战略高度,认识当代大学生践行"三个代表"的重要性。为此,应坚持从现实的实际出发,找准切入点和落脚点,这是保证这一工作收到成效必须坚持的基本原则;同时,还要以"三个代表"重要思想为统领,积极推进教育改革,建立和完善符合"三个代表"要求的教育体制和机制,这是当代大学生践行"三个代表"取得成效的根本性保证。     

深入学习宣传宪法 高等学校责任重大

最近中共中央对进一步学习和贯彻实施《中华人民共和国宪法》进行了研究部署,教育部党组也对全国高校的宪法宣传、贯彻、实施工作作了具体安排。本文结合高等学校实际情况,从三个方面探讨了高等学校学习、宣传宪法的有关问题,即正确认识理解新宪法的精神实质;高等学校做好学习、宣传宪法工作的意义;高等学校如何做好宪法的宣传工作。     

Growth and Heat Resistance Kinetic Variation Among Various Isolates of Salmonella and its Application to Risk Assessment

The abilities of cells of a particular type of bacteria to leave lag phase and begin the process of dividing or surviving heat treatment can depend on the serotypes or strains of the bacteria. This article reports an investigation of serotype-specific differences in growth and heat resistance kinetics of clinical and food isolates of Salmonella. Growth kinetics at 19 degrees C and 37 degrees C were examined in brain heart infusion broth and heat resistance kinetics for 60 degrees C were examined in beef gravy using a submerged coil heating apparatus. Estimates of the parameters of the growth curves suggests a small between-serotype variance of the growth kinetics. However, for inactivation, the results suggest a significant between-serotype effect on the asymptotic D-values, with an estimated between-serotype CV of about 20%. In microbial risk assessment, predictive microbiology is used to estimate growth and inactivation of pathogens. Often the data used for estimating the growth or inactivation kinetics are based on measurements on a cocktail--a mixture of approximately equal proportions of several serotypes or strains of the pathogen being studied. The expected growth or inactivation rates derived from data using cocktails are biased, reflecting the characteristics of the fastest growing or most heat resistant serotype of the cocktail. In this article, an adjustment to decrease this possible bias in a risk assessment is offered. The article also presents discussion of the effect on estimating growth when stochastic assumptions are incorporated in the model. In particular, equations describing the variation of relative growth are derived, accounting for the stochastic variations of the division of cells. For small numbers of cells, the expected value of the relative growth is not an appropriate "representative" value for actual relative growths that might occur.     

Role of workplace safety: a revisit of the relationship between job satisfaction and employment status

This study evaluated the relationship between employment status (i.e., part- and full-time) and job satisfaction, with the focus on the moderating roles of perceived injury risk and injury incidence. The results found that the level of job satisfaction for full-time workers was about the same regardless of the level of injury risk they perceived. In contrast, job satisfaction of part-time workers was significantly higher when they perceived low injury risk rather than high injury risk. The findings also supported the potential adverse impact of injury incidence and injury risk on job satisfaction for both part- and full-time workers. This study highlighted the importance of understanding both workplace safety and job satisfaction when attempting to understand the differences between part-time and full-time workers.     

Marginal Regression of Gaps Between Recurrent Events

Recurrent event data typically exhibit the phenomenon of intra-individual correlation, owing to not only observed covariates but also random effects. In many applications, the population may be reasonably postulated as a heterogeneous mixture of individual renewal processes, and the inference of interest is the effect of individual-level covariates. In this article, we suggest and investigate a marginal proportional hazards model for gaps between recurrent events. A connection is established between observed gap times and clustered survival data with informative cluster size. We subsequently construct a novel and general inference procedure for the latter, based on a functional formulation of standard Cox regression. Large-sample theory is established for the proposed estimators. Numerical studies demonstrate that the procedure performs well with practical sample sizes. Application to the well-known bladder tumor data is given as an illustration.     

结合"书面对话"提高"思想道德修养"教学实效

书面对话是指师生间以语言文字进行的一种双向交流,学生在对话本上写出自己的问题,教师阅读后给予书面回复,与一般的批改作业不同.本文主要探讨书面对话的特点,书面对话对于"思想道德修养"课程教学的作用,以及如何更好地开展书面对话,来提高"思想道德修养"课程教学的实效.     

体育知识、能力、素质的当代内涵

就制约体育方向的“学科中心论”、“手段论”、“目的论”、“素质教育论”等中外体育观念进行异同比较 ,在比较中将体育改革定位于人的发展 ,坚持面向全体学生 ,全面提高学生体育素质的指导思想 .在这一观念引导下 ,对传统知识观和现代知识观进行比较 ,阐述了体育知识、能力、素质内涵的新变化 :当代体育知识 ,不仅是力量 ,它首先是能力 ;身体素质内涵全面扩展 ,除了生理素质外 ,还应向心理素质、科学文化素质、思想道德素质和职业素质扩展     

复合型人才培养模式的探讨

文章介绍了苏州城建环保学院开设英语辅修专业研究和实践的过程,包括基本内容,创新点和应用情况。实践表明在理工院校开设英语辅修专业不仅为大学英语教学改革提供了新的思路,而且为探索培养复合型人才模式开辟一条有效途径。     

信息缺失下的应急方案选择模型及算法研究

信息缺失是应急事件处置中的一个重要特征.对于考虑信息缺失的两阶段应急处置问题,本文提出了应急方案效度的概念,构造了考虑资源约束条件下的应急方案选择模型,并给出了求解算法.数值结果表明模型及算法的有效性.