Optimal 2n-p fractional factorial designs for dispersion effects under a location-diapersion model

We consider main effects models for 2-level experiments that also include. Parameters characterizing potential dispersion effects due to specified factors. One special case is considered. In this case only a single specified factor is responsible for the dispersion effects. We determine the connection between alias relations and Optimality of a design for estimation of dispersion effects in the class of regu!ar fractional Y - P factorial designs of resolution III or higher. This rmectioil heips US identify those designs that are A-optimal for estimating dispersion effects by a suitable choice of defining contrasts. in particuiar, we show that an increase in efficiency with respect to dispersion effects is accompanied by a loss iii efficiency for estimating the location effects. In practice, one mmt thcrcfcre accept a trade& between the efficiencies associated with estirnates of location effects and dispersion effects.     

地方视域中的社会主义范式转换——基于广东科学发展新路的考察

本文认为科学发展观标志着社会主义在中国进入第三个范式阶段,具有地域化特征,并以广东科学发展新路为例,从三个层面展开考察:一从地方性问题看使命转换,包括旧范式下的发展方式给广东带来的发展困境、路径依赖、改革困局,由此决定了广东在全国科学发展格局中的使命;二是从地方性认知看理念转换,包括广东对问题性质、问题症结、解决问题的思想路径、解决问题的方式方法的认知,由此勾勒出广东在重新理解、阐释新范式方面形成的新观念体系;三是从地方性实践看路径转换,从以解放思想为切入点、以经济发展方式转变为主攻点、六大转变、改革引领四个方面,论述了广东开辟科学发展新路的实践路径。     

略论中国人对澳洲的早期认识

在欧洲人看来，澳洲是他们发现的。其实根据中国史籍记载，早在唐宋时期，中国人就对澳洲有所认识。最初中国人对澳洲的知识是通过与马来人和阿拉伯人的接触得来的，其中难免掺杂了道听途说的成分。随着海外交通的发展，中国人对澳洲的认识也从模糊到逐渐清晰。宋元时期，中国帆船远航澳洲海岸，与澳洲发生了直接的接触，对当地风土人情有了较为翔实的记载。史实表明，尽管郑和下西洋未到过澳洲，但是在郑和之前的遥远时代，中国人早已航抵澳洲大陆     

新日铁安赛乐全球战略联盟的发展

新日铁-安赛乐全球战略联盟以汽车板业务合作为核心,建立了完善的运行机制和配备了相应的人员.通过战略联盟合作,双方不仅构建了符合汽车制造业发展要求的汽车板产品全球供应及服务体系,而且在采购、环保及可持续发展、定标比超等合作领域也取得了进展.安赛乐与米塔尔合并后,新日铁与新公司签署了新的合作协议而使这一战略联盟得以延续.     

高职高专旅游人才培养探析

旅游业的快速可持续发展需要有高素质的旅游人才储备作为支撑。如何培养受市场欢迎的高素质的旅游专业人才，是旅游高职教育必须着重解决的问题。本文在分析高职旅游人才培养存在的问题的基础上，提出了高职旅游人才培养的方向。     

近年来我国总需求萎缩的体制背景分析

本文认为 ,近年来我国经济运行中出现的总需求萎缩现象有着深刻的制度背景。经济转轨过程中储蓄主体与投资主体的分离 ,储蓄—投资转化机制的堵塞与不畅 ,转轨过程中市场格局的转变 ,以及转轨过程中市场主体心理的变化 ,都是构成我国总需求萎缩的深层的体制根源。     

我国医疗体制改革对医疗机构的挑战及对策

本文讨论了我国医疗体制改革给医疗机构带来的挑战,分析了医疗服务及其营销组合的特点.在此基础上,从实施差异化战略和改进医疗服务质量管理的角度,提出了迎接挑战的几个对策性建议.     

How responsive is U.S. population growth to immigration? A situational sensitivity analysis

There has been public concern about the effect of immigration on population growth in the U.S. But how responsive is population growth to immigration? This paper examines the sensitivity of intrinsic population growth to immigration and situates such sensitivity in fertility and survival changes. The application of second derivatives on a modified Leslie matrix facilitates the analysis of situational sensitivity of U.S. population growth to immigration. The results show that the sensitivity to immigration is not as influential as the sensitivity to fertility, and that the sensitivity to immigration further depends on changes in fertility and survival.     

浅析新生代农民工犯罪现象

党中央国务院十分重视解决新生代农民工问题.新生代农民工这一群体的犯罪现象日益严重,从制度、经济、文化、社会、心理等方面看,有其主客观的原因,最主要根源在于城乡二元制度的存在.为此,将新生代农民工市民化、推进积极就业、完善社会保障、加强教育与培训、加强和改善城市建设,积极调动全社会的力量采取相应对策,对新生代农民工犯罪问题进行防控与善治,当前尤其重要.     

Intention to leave in social workers and educators employed in voluntary child welfare agencies

Introduction

Individuals employed in child welfare settings can have a profound impact on children in care. Research shows that direct care staff can have an effect on emotional and physical outcomes for children with whom they work. This paper seeks to expand knowledge of the child welfare workforce by studying educators employed in child welfare settings and comparing their job satisfaction and intent to leave with that of prevention workers employed in similar settings.

Materials and methods

Data for prevention workers (n = 538) were obtained from workers employed at all preventive service programs under contract with a large municipality. Data for educators were obtained from voluntary agencies located elsewhere in the state (n = 139). The instrument was a modified version of a survey developed to examine job satisfaction and potential turnover among public child welfare workers. Domains measured included various aspects of job satisfaction, intention to leave, and whether workers regretted taking their jobs. Data were analyzed using bivariate analysis and structural equation modeling (SEM).

Results

While both educators and prevention workers varied on different domains of job satisfaction, their overall satisfaction did not differ nor did their intention to leave their jobs. Satisfaction with contingent rewards, the nature of the work and opportunities for promotion along with not regretting taking one's job were predictive of thinking about leaving one's job. Thinking about leaving was predictive of taking concrete steps towards actual leaving.

Discussion

While people both prevention workers and educators report different levels of job satisfaction and work conditions in their agencies, job title itself has less to do with a worker's intention to leave, as measured by both thinking about leaving and taking steps towards actively looking for a new job, than other factors. Larger contextual factors may be at play in workers' decisions to stay employed. Suggestions are made for reducing turnover intentions along with suggestions for further study to clarify the role of organizational factors in workers' intention to leave.