黄金冶炼设备的润滑问题及解决措施

分析黄金冶炼设备维护和保养中的润滑问题,产生设备润滑问题的诸原因,给出解决设备润滑问题的主要方法。     

Behavior patterns of investment strategies under Roy’s safety-first principle

The safety-first principle is a natural motivational factor in decision making, and is closely related to certain popular heuristics such as satisficing. We provide a systematic analysis of optimal portfolio choice under Roy’s safety-first principle by examining and comparing the behavior patterns of three popular investment strategies: the optimal constant-rebalanced portfolio, dynamic-rebalanced portfolio and buy-and-hold strategies. Our results indicate the importance of a match between the investment strategy, the investment goal, and the investment horizon. We also develop a geometric approach to investigate the relationships among the safety-first, expected utility, and mean-variance models and offer an explanation for the long-standing debate concerning different patterns of time-diversification effects.     

民营快递发展问题及对策分析

对民营快递发展存在的整体素质偏低、快递成本加剧、内部管理不当、中转站时效差、来自行业内外企业的竞争威胁等问题进行分析,并在此基础上进行对策分析。提出的对策有:增强服务意识、建立快递协会、完善管理制度、提高中转站运作效率、走品牌差异化、服务个性化路线等。     

Food market liberalization: History and prospects

Abstract

Government intervention has been a feature of food markets in both industrialized and agrarian economies. However, the last 10 years have seen reforms aimed at reducing intervention; these have been a characteristic of ‘structural adjustment’. The process of reform has involved the replacement of administered by market‐determined prices and the abolition of trading parastatals or the removal of their monopoly. Despite an almost complete consensus that reforms are necessary and the absence of coherent local opposition, the pace and extent of reforms have varied. Moreover, views about liberalization tend to be polarized. Proponents argue that continued intervention is inefficient, unaffordable and distorting; antagonists suggest that unmodified markets lead to unacceptable inequalities, and expose producers and consumers to unacceptable risks. Moreover, weak fragmented markets do not constitute a sufficient base for sustained growth. This paper reviews the experience. It concludes that simple solutions of substituting public with private trading are not necessarily possible nor desirable, and argues that the nature of the debate may be misleading. The way forward may not lie in a choice between private market supremacy and conventional government intervention.     

护理专业课程中教与学策略的探讨

从教与学的角度,探讨在医学教育课程知识的传授过程中,应把握教与学的和谐统一;根据教学内容选择授课方式及媒体资源;根据讲授知识的难易度设定授课目标;授课结束时,运用适当的方式对学生的学习效果进行评价。     

小型水利工程质量存在的问题及对策浅析

水利工程的兴建,对于周围地区的环境将产生非常大的影响。因此,制定水利工程规划,必须要从流域或地区的全局出发,以期减少不利影响,才能收到经济、社会和环境的最佳效果。工程质检工作是工程质量监督管理的重要环节,也是保证工程质量的重要条件。如果要保证水利工程质量,就要必须坚持认真进行质量检测。     

Computing DSGE models with recursive preferences and stochastic volatility

This paper compares different solution methods for computing the equilibrium of dynamic stochastic general equilibrium (DSGE) models with recursive preferences such as those in Epstein and Zin, 1989, Epstein and Zin, 1991 and stochastic volatility. Models with these two features have recently become popular, but we know little about the best ways to implement them numerically. To fill this gap, we solve the stochastic neoclassical growth model with recursive preferences and stochastic volatility using four different approaches: second- and third-order perturbation, Chebyshev polynomials, and value function iteration. We document the performance of the methods in terms of computing time, implementation complexity, and accuracy. Our main finding is that perturbations are competitive in terms of accuracy with Chebyshev polynomials and value function iteration while being several orders of magnitude faster to run. Therefore, we conclude that perturbation methods are an attractive approach for computing this class of problems.     

物流信息系统监控在制造型工厂的应用与思考

从QCD角度,阐述了均衡性、先入先出(FIFO)遵守率、送货准时率的内容、指标及计算方法,介绍了2011年度神龙公司襄阳工厂运用零件流系统后台数据监控物流作业标准化取得的效果,同时指出了后期改善的方向.     

我国环渤海地区人口流动与社会经济的协调发展

流动人口与区域经济社会协调发展成为当前我国流动人口管理的重要问题。在经济快速发展和流动人口规模持续增长的过程中,环渤海地区正面临着流动人口如何与经济社会发展相协调的严峻挑战,因而在＂十二五＂时期应该通过深化城乡体制改革、加快产业结构调整等措施,积极促进流动人口更好地服务于区域经济社会发展。     

VaR约束与资产配置优化——基于中国证券市场的经验数据分析

VaR模型是一种有效的风险计量和管理工具。在假设组合收益服从正态分布的条件下，分析了引入VaR约束的均值一方差模型及有效边界；考虑在一定置信水平下。结合组合收益的实际分布，给出了满足投资者VaR约束下期望收益最大化的计量模型及投资策略选择，并利用中国证券市场数据进行了实证研究。