关于新一轮价格水平上涨的思考

今年以来，我国价格水平上升势头呈现加快的迹象。分析表明，当前物价水平上升主要是结构性的，是经济增长和发展中矛盾积累到一定程度的突现，是经济增长遇到了瓶颈产业制约。同时，粗放性经济增长方式也是物价水平上升的重要因素。因此，保持价格水平稳定，促进经济持续、快速、健康发展，必须解决好能源、粮食、经济增长方式等问题。     

结合CET4促进大学英语听力日常训练

本文从CET4对于学生听力的要求入手,结合具体的课堂,从知识面、听说习惯、记忆能力,心理素质四个方面,详尽探讨了日常训练听力的方法,目的在于帮助学生克服考前听力复习的仓促局面,同时又能有效地提高他们自身的听力水平。     

基于神经网络方法的风机故障诊断

针对旋转机械故障征兆与故障模式映射的复杂性,将反向传播(BP)网络、径向基(RBF)网络和概率网络(PNN)用于风机进行故障诊断,并比较了3种网络的诊断精度。以风机振动信号的7段频谱能量峰值作为故障特征,采用训练好的神经网络进行故障辨识,结果表明,RBF网识别精度高于PNN网络,BP网络表现较差。     

西安民办高校篮球运动的发展现状与分析

通过问卷调查法、文献资料法、访问座谈法、数据整理统计法等研究方法进行调查研究,从西安民办高校的师资队伍、学生的篮球兴趣及影响因素等方面对西安民办高校进行了调查,并针对现实中存在的问题,提出相应的建议,为在西安民办高校更好的发展篮球运动提供参考依据。     

物理实验用无胶斑激光靶研制

文章简述了无胶斑激光靶的制备工艺。原先的平面靶是将靶杆直接放到金圆盘靶平面上用胶粘接,现在是金圆盘本身长出连接金丝,使金丝与靶杆用胶粘接,从而避免了金圆盘表层有胶。在电火花加工过程中,工具和工件之间的脉冲火花放电产生局部,瞬间的高温把金属材料逐步蚀除掉,因此工具与工件之间无相互作用力。在微细加工方面有独特的优势。重要的是一次加工成型,既保证了加工精度,又提高了加工效率,省时省力。无胶斑激光靶的研制成功,消除了激光靶表面上的胶斑,同时也提高了激光靶的装配质量,使激光靶的制造精度得以提高,为物理实验提供了条件。     

Social capital as a distinctive feature of Social Economy firms

In recent years, the growing importance in developed countries of the Social Economy sector and the contribution of social capital to regional economic development are being studied in depth. Linking these two fields of research, the aim of the present work is to analyse the social capital endowments of Social Economy firms in comparison to those in traditional profit-maximizing firms. To do so, a literature review will be firstly carried out to clarify both the concept of social capital and, more specifically, its relation with entrepreneurship and social enterprises. In the empirical section, the social capital endowments both of social firms (cooperatives and owned-worker enterprises) and traditional firms are compared using data from two surveys conducted in Andalusia, a lagged Spanish region with long tradition in the Social Economy sector. Results show that social capital endowments measured through cooperation agreements and company links with local suppliers and costumers are higher in cooperatives and worker-owned companies. Therefore, Andalusian authorities must continue with its support policy to these enterprises as a mean to reinforce the regional economic development.     

英语口语表达中的图式构建

现代图式理论的研究成果很多已被用于阅读教学,教会学生掌握阅读方法,提高阅读能力。口语,人们一生中使用得最多的表达手段和交流方式。在未来社会中,随着生活节奏和工作节奏的加快,通讯工具的发展,英语口语在人们生活和生产中的运用将更加广泛和频繁。在本文我们将通过调查研究和教学实践来探讨现代图式理论对于英语口语教学的指导意义。     

Frailty models with applications to the study of infant deaths on birth timing in Ghana and Kenya

In hazard models, it is assumed that all heterogeneity is captured by a set of theoretically relevant covariates. In many applications however, there are ample reasons for unobserved heterogeneity due to omitted or unmeasured factors. If there is unmeasured frailty, the hazard will not only be a function of the covariates but also of the unmeasured frailty. This paper discusses the implications of unobserved heterogeneity on parameter estimates with application to the analysis of infant death on subsequent birth timing in Ghana and Kenya using DHS data. Using Lognormal Accelerated Failure Time models with and without frailty, we found that standard models that do not control for unobserved heterogeneity produced biased estimates by overstating the degree of positive dependence and underestimating the degree of negative dependence. The implications of the findings are discussed.     

Application of fuzzy mathematical programming to imprecise project management decisions

In real-world project management (PM) decisions, the input data and environmental coefficients are generally imprecise/fuzzy because of incompleteness and unavailability of relevant information over the project planning horizon. This work aims to present a fuzzy mathematical programming approach to solve imprecise PM decision problems with fuzzy goal and fuzzy cost coefficients. The designed PM decision model attempts to minimize total project costs with reference to direct costs, indirect costs, contractual penalty costs, duration of activities and the constraint of available budget. The proposed approach achieves greater computational efficiency by employing the simplified triangular fuzzy number to represent imprecise goal and cost coefficients, and provides a systematic framework that facilitates the decision-making process, enabling a decision maker to interactively modify the imprecise data and related parameters until a satisfactory solution is obtained. An industrial case is implemented to demonstrate the feasibility of applying the proposed approach to practical PM problems. The computational methodology developed in this work can easily be extended to any other situations and can handle the realistic PM decisions in fuzzy environments.     

Using the social system of a supply chain to improve a focal organization’s operating performance

In this paper, we explore how a large organization, operating in a mature, asset-intensive industry, used the social system of a key supply chain to generate significant improvement in operating performance (e.g., inventory turnover ratio improved from 0.8 to 3.2 in 5?years). A case study approach was used to study a steel rail supply chain involving an Australian railway company as the focal company. This supply chain consisted of two other companies: a steel manufacturer and a bulk transporter. Multiple forms of data were collected and analyzed, including models and process maps of the supply chain, published and internal documents, Enterprise Resource Planning system reports, and in-depth interviews of 31 key personnel involved in the supply chain. We found that the organizations had invested heavily in formal systems, such as governance processes and information technology systems. However, it was the informal mechanisms across and within the social system which made the greatest contribution to the resulting improvements. This suggests that organizations may be able to achieve significant operating performance outcomes at far lower cost and in shorter time frames by working through the existing social systems instead of focusing excessively on formal governance and IT systems.