基于MSP430F449单片机的24BYJ48步进电机控制

该文介绍了步进电机工作原理,结合MSP430F449单片机,给出MSP430F449单片机的24BYJ48步进电机控制的接口电路及程序实现。文章介绍的硬件和软件均经过实践检验,结构简单,使用方便。     

24式太极拳项目特征及其健身作用探悉

太极拳是中华民族宝贵的文化遗产,它以独特的演练方式吸引了无数武术爱好者,它不但注重技击,而且注重修身养性,许多人把演练太极拳作为一种个人修身的方法。24式太极拳是《全民健身计划》推行普及的项目,是进行有氧锻炼的典型运动之一,也是人们终生锻炼的理想运动方式,文章针对24式太极拳项目特征及其健身效应进行探讨,从而使人们对太极拳有更深的理解。     

24式太极拳教学改革的实践研究

文章依据《全国普通高等学校体育课程教学指导纲要》,针对中医院校的专业特色,围绕"快乐体育,特色项目"这一思路,对24式太极拳课程教学开展一系列研究。在教学目标、教学内容、教学形式、教学评价等方面进行了改革创新,并构建了新的教学模式。     

运动对24小时动态血压的影响

采用文献资料法综述近年来国内外有关运动对24小时动态血压的影响的研究表明,一次性运动后会导致血压在一定时间下降(可持续22小时),有时甚至低于对照水平(运动后低血压),长期进行中等强度的有氧运动对血压正常者或高血压患者24小时的动态血压具有较好的降压效果。遗传、神经体液因素的改变、血管结构及血管反应性的改变、体重降低以及胰岛素抵抗的降低等都可部分解释运动的降压作用。     

从“招呼语”谈英语语用能力培养

英语教学不仅要教给学生知识,还要培养学生运用知识的能力。但在实际运用中,经常出现语用失误。下面从常见的＂招呼语＂入手,分析语用失误原因,并提出如何培养学生语用能力的具体对策。     

表象训练在“二十四式”教学中的应用研究

针对武术项目教学"三多"的问题,以人体生理学运动技能形成的过程为切入点,在传统的"二十四式"教学方法的基础上采用对比实验法、数理统计法、文献资料等研究方法,对表象训练法的教学效果进行研究。实验证明这种教学方法能激发学生的学习主观想象力,达到更好的教学效果。     

对事业部体制下企业核心能力管理问题的探讨

事业部制自产生以来就日益在产业界得到了广泛的应用，并成为企业组织结构的标准模式之一。然而欧美、日本等国家的一些大企业在其事业部制实践中逐渐认识到传统事业部制在核心能力管理上存在着一定的缺陷，并通过一些探索性的实践对事业部制的修正与发展进行了努力。本文对事业部制下企业核心能力管理问题进行了进一步的分析和探讨，以期为我国事业部体制的发展和完善提供借鉴与参考。     

Cooperative R&D and firm performance

We analyse the impact of R&D cooperation on firm performance differentiating between four types of R&D partners (competitors, suppliers, customers, and universities and research institutes), and considering two performance measures: labour productivity and productivity in innovative (new to the market) sales. Using data on a large sample of Dutch innovating firms in two waves of the Community Innovation Survey (1996, 1998), we examine the impact of R&D cooperation in 1996 on subsequent productivity growth in 1996–1998. The results confirm a major heterogeneity in the rationales and goals of R&D cooperation. Competitor and supplier cooperation focus on incremental innovations, improving the productivity performance of firms. University cooperation and again competitor cooperation are instrumental in creating innovations generating sales of products that are novel to the market, improving the growth performance of firms. Furthermore, customers and universities are important sources of knowledge for firms pursuing radical innovations, which facilitate growth in innovative sales in the absence of formal R&D cooperation.     

The discrete charm of the bourgeoisie: quantum and continuous perspectives on innovation and growth

This paper discusses the relative merits of discrete versus continuous perspectives on innovation, technical change, and economic growth. It discusses the innovation time series literature in some detail to extract the continuous and clustering properties of the historical record on innovation. It then proposes a mosaic/avalanche model based on percolation theory and self-organized criticality to address this question.     

The ex ante assessment of knowledge spillovers: Government R&D policy, economic incentives and private firm behavior

This paper investigates the role of government R&D subsidy programs in stimulating knowledge spillovers. R&D subsidies are an effective public policy instrument when knowledge spillovers exist yet ex ante it is difficult to identify projects that have the greatest potential to increase innovation and economic growth. This paper derives a set of project and firm attributes that the literature finds generate knowledge spillovers and uses data on project proposals to estimate the degree to which a government R&D program conforms. We find that projects that were awarded R&D subsidies were more likely to have attributes such as participation in new research joint ventures and connections to universities and other firms. Following the post-award activities of firm, we find that receipt of a government R&D subsidy increased the funding from other sources when compared to firms that were not awarded funding.