二语习得中的输入与输出

输入和输出是外语学习的两个终端行为 ,文章在客观地介绍了Krashen的输入假说和Swain的输出假说后 ,着重探讨了两者的相关本质及对我国英语教学的启示     

降低粮食物流业经营成本的对策研究

科学、合理地降低粮食物流业的经营成本,提高粮食物流业的经营效率,对促进物流业及整个国民经济的发展具有十分重要的意义.从粮食物流所处的经济环境入手进行分析,阐述了目前我国粮食物流业经营成本偏高的主要原因,并在此基础上,提出了降低粮食物流业经营成本的具体构想.     

体裁分析法与写作产出

语言学习是一个输入→吸收→输出的循环过程。吸收过程中大量的操练活动是确保有效输出的关键环节。文章试探讨写作教学中议论文体裁的范文输入及范文体裁分析操练方式能否帮助学习者的语篇图式结构从母语模式向目的语模式转换,并在写作中有效输出。     

基于人工神经网络的国家新建粮库运营绩效评价方法研究

国家新建粮食储备库运营绩效的评价应从这一概念的内涵出发,建立运营绩效评价的多层次指标体系,把人工神经网络作为评价理论依据.提出了评价的基本思路,构建了评价的反向误差传播(BP)模型.     

建立粮食主产区与主销区利益协调机制的初探

以粮食主产区和主销区产销不协调的主要表现为切入点,对粮食主产区和主销区产销利益协调进行博弈分析,得出影响粮食主产区与主销区不协调的主要因素,从而提出建立粮食主产区与主销区利益协调机制的路径选择。     

高校办学效益的一种计算方法探讨

依据投入产出比方法 ,将高校的投入与产出指标进行量化 ,提出了一种实用的高校办学效益评价方法     

试论反馈电路的判别方法

本文通过引入输入端电极、输出端电极的概念,就反馈电路的判别提出了几点方法和注意事项。使反馈电路的判别更容易。     

江苏高新技术产业专利面临的问题与对策

江苏高新技术专利面临缺乏自主创新、产出数量少、发明专利少、产出效率低、缺少研发人才、跨国公司挤压等问题。本文提出从战略上确立自主创新发展自己的核心技术、实施企业专利战略、提高科技投入效率、保护知识产权、营造创新环境、建设创新型科技人才队伍等对策来提高江苏高新技术产业专利的产出水平。     

清代湖南农业经济透视

清代湖南农业经济获得巨大发展。它主要表现在三个层面上:粮食总产量和单位产量不断增长,成为清代重要的粮食输出地;耕地规模虽不断缩小,却能支撑巨大的人口生存;农民收入渠道多样化,拓宽了农民的生存途径。但是,总体来说,湖南农业发展受到诸如人口过剩、人们的生活习惯、农作物品种单一等问题的限制。     

International Business Cycle Asymmetry and Time Irreversible Nonlinearities

Using tests of time reversibility, this paper provides further statistical evidence on the long-standing conjecture in economics concerning the potentially asymmetric behaviour of output over the expansionary and contractionary phases of the business cycle. A particular advantage of this approach is that it provides a discriminating test that is instructive as to whether any asymmetries detected are due to asymmetric shocks to a linear model, or an underlying non-linear model with symmetric shocks, and in the latter case is informative as to the potential form of that nonlinear model. Using a long span of international per capita output growth data, the asymmetry detected is overwhelmingly consistent with the long standing perception that the output business cycle is characterized by steeper recessions and longer more gentle expansions, but the evidence for this form of business cycle asymmetry is weaker in the data adjusted for the influence of outliers associated with wars and other extreme events. Statistically significant time irreversibility is reported for the output growth rates of almost all of the countries considered in the full sample data, and there is evidence that this time irreversibility is of a form implying an underlying nonlinear model with symmetrically distributed innovations for 15 of the 22 countries considered. However, the time irreversibility test results for the outlier-trimmed full sample data reveal significant time irreversibility in output growth for around one half of the countries considered, predominantly in Northern Europe and North America, and of a form implying a nonlinear underlying model in only a further half of those cases.