我国农产品物流落后原因初探

在我国，农产品物流很少有人关注，但是，由于农产品的物流落后使我国农产品的损失却大得惊人。这不仅极大地影响了农民收入水平的提高，还严重削弱了我国农产品的国际竞争力。本文对我国农产品物流落后的原因进行了全面、深入的探讨。     

1997～2006年经济波动之新解:资本监管和货币政策非对称效应——兼论2007～2008年中国经济的"三高"现象

1997～2006年我国经济运行出现的经济增长和物价波幅减缓、长期通货紧缩、存差持续扩大等新特点,受到广泛关注.本文借助货币政策传导的信贷渠道,将资本监管因素纳入货币政策非对称效应的分析框架,建立了KCC-LM模型.该模型内含的资本监管因素强化的货币政策对银行信贷和产出的非对称效应较好地解释了1997～2006年我国经济波动的新特点及2007～2008年经济的"三高"现象,并揭示了1998年以来我国实施的稳健性货币政策所折射出的"宽货币-紧信贷"的调控思路,该思路的制度性原因是我国金融控制力目标和金融稳定性目标的内在矛盾.     

The bivariate non-central negative binomial distributions

Summary Four bivariate generalisations (Type I–IV) of the non-central negative binomial distribution (Ong/Lee) are considered. The Type I generalisation is constructed using the latent structure model scheme (Goodman) while the Type II generalisation arises from a variation of this scheme. The Type III generalisation is formed by using the method of random elements in common (Mardia). The Type IV is an extension of the Type I generalisation. Properties of these bivariate distributions including joint central and factorial moments are discussed; several recurrence formulae of the probabilities are given. An application to the childhood accident data of Mellinger et al. is considered with the precision of the Type I maximum likelihood estimates computed.     

央递服务网络结构演变趋势分析——以长三角为例

针对快递服务网络规划问题中的两类网络物理结构形态的优劣评估问题,在动态环境下分析了网络结构变化的影响因素及其演变趋势,发现网络节点城市之间业务量的大小对于基于集中规模经济效应的轴辐式网络的成本节约优势是否成立有主要影响。这说明纯轴辐式与全连通这两个网络结构并不存在必然的优劣之分,各自的成本节约优势取决于所有城市之间业务量等参数的变化。最后结合国内有关标杆企业的数据,对长三角区域的快递服务网络结构演变趋势进行了实例分析,结果验证了所得出的结论。     

Who Gains from the Demographic Dividend? Forecasting Income by Age

Changes in the population age structure are known to influence the total income per person, but little is known about whether the changes are equally shared across the population or are concentrated on particular age groups and/or birth cohorts. The answer to this question has potentially important implications for income inequality, human capital investment, and fertility decision-making. We propose a new model of intergenerational transfers which distinguishes between the effects of changes in population structure and the effects of changes in family age structure. Using age-specific data from annual income and expenditure surveys of Taiwan between 1978 and 1998, we show that changes in age structure have had a very favorable effect on Taiwan's income growth. The gains are not equally shared by all age groups, however. Children and young adults have benefited the most, while the elderly have benefited the least. The population and family age structures have independent effects on per capita income; the effect of the population age structure is most important. Generational differences in per capita income are closely related to intergenerational differences in earnings, suggesting only a weak form of altruism. Finally, we predict that, on average, population aging will adversely influence the per capita income growth in Taiwan in the coming decades.     

基于供应链管理环境下的零售企业物流合理化研究

根据零售企业物流的发展状况,参考供应链管理的思想,通过对零售企业物流进行系统的分析研究,提出了供应链管理环境下提高我国零售企业物流合理化水平的战略途径——第三方物流、一体化物流和精益物流。     

Environmental regulations in private and mixed duopolies: Taxes on emissions versus green R&D subsidies

In this article, we compare two kinds of environmental regulations—emissions taxes and green R&D subsidies—in private and mixed-duopoly markets in the presence of R&D spillovers. We show that a green R&D subsidy is better (worse) than an emissions tax when the green R&D is efficient (inefficient), irrespective of R&D spillovers, whereas the existence of a publicly owned firm encourages the government to adopt a subsidy policy. We also show that the optimal policy choice depends on R&D efficiency and spillovers. In particular, when green R&D is inefficient and the spillover rate is low (high), the government should choose an emissions tax and (not) privatize the state-owned firm. When green R&D is efficient, however, an R&D subsidy is better, but a privatization policy is not desirable for society, irrespective of spillovers.     

基于.NET技术的实验室人员考核系统

为了解决实验室传统的人工考核和繁琐的客户端记录,实现更为高效的绩效评估和考核,让实验教学质量进一步提高,依据学校的考核标准来实现考核系统的智能化,构建一个在线的实验室人员考核系统。     

投入产出表和社会核算矩阵更新研究评述

本文对投入产出(IO)表和社会核算矩阵(SAM)更新方法进行了归类和比较评述。主要观点:第一,已有的IO表或SAM更新方法主要分为统计学方法、优化法和宏观经济学分析方法;第二,以现代经济学为基础的更新技术应引起高度重视;第三,在非普查年份,统计部门应制度化地开展重点IO系数调查,并将相关数据及时公开化;第四,在实际操作中应正确认识更新中已知信息的地位,并注意更新中的保号性问题。     

鸢尾属植物抗旱生理指标的测定

利用聚乙二醇(PEG-6000)以10%、20%、30%三个浓度,将四个品种鸢尾植株进行浸根处理,作为模拟土壤干旱胁迫。测定结果表明:马蔺具有较强的抗旱性。质膜透、MDA含量和SOD活性含量是鸢尾属植物重要的抗旱生理指标。