企业集群形成机理的进化博弈分析

企业集群的形成机理一直是企业集群理论研究和实践中最受重视和值得关注的问题之一。企业集群的形成实质上是一个网络外部化的过程，而其形成过程本质上类似于有限理性下复制动态进化博弈。并在此基础上建立了企业集群形成的进化博弈模型，由此得出企业集群形成的机理：当某个区位具有较强的网络外部化效应时，在其作用下，企业通过学习、调整和模仿会相继进入该区位，则该区位比较容易形成企业集群；如果某个区位具有较弱的网络外部化效应时，只有在区位已有的企业不设防下，随着进入区位的企业数量增加，或者依靠外部力量，特别是政府的政策作用，使得该区位的网络外部化效应增大时，该区位才能逐渐形成为企业集群。     

Progressive drawing: A novel “lid–opener” and “monotony–breaker”

An innovative strategy called “progressive drawing” was used at the beginning (lid‐opener) and later (monotony‐breaker) during gross anatomy lectures. Diagrams were drawn on the classroom blackboard with anatomic structures added one by one. Students identified and labeled the diagrams and predicted the next structures to be drawn. Students felt that the strategy helped to activate prior knowledge, created interest in the current lecture, and made lecture sessions more interactive. The strategy has appeal for visual, auditory, read/write, and kinesthetic learners. Anat Sci Educ, 2010. © 2010 American Association of Anatomists.     

连续归纳法的第三形式

在[1]的基础上给出了连续归纳法的第三种常见形式,并举例以展示其应用。     

费马光行最速原理的另一种数学论证

利用初等函数的单调性、连续性论证了著名的费马光行最速原理 .     

连续函数的单调性

连续性和单调性都是函数的重要特性。一般来讲，这两个性质并无必然联系。但由于连续函数的特殊性，函数的单调性表现在连续函数上又具有一些新的特点。本建立了两个直接判断连续函数单调性的定理，并进一步分析了在研究连续函数单调性时应注意的问题。     

正项级数收敛判别方法的推广

对具有单调递减的正项级数的敛散性进行了研究,给出了收敛性判别的几个新方法,这些方法是对现有的判别法的推广。     

Training Content and Potential Impact on Performance

The purpose of the present investigation was to compare the content of 8 weeks of training in young endurance-trained male and female runners and study the potential impact of this training content on performance. Fourteen men and 11 women performed two criterion exercises until exhaustion on an outdoor track before and after the 8-week training period. The first test was a graded exercise to determine maximal aerobic velocity (Mav), the velocity at the lactate concentration threshold (v-Tlac), and the velocity at delta 50 (vΔ50: the velocity halfway between Mav and v-Tlac). The second test was a constant run at vΔ50 to determine the time to exhaustion at this velocity (tlimvΔ50). Training logs were used to monitor the self-directed training sessions. The results showed that the women had a lower training volume but trained at higher exercise velocities than the men. However, they presented similar values as the men for expected temporary performance capacity and did not improve their performance (Mav and tlimvΔ50) over the 8-week period. After the training period, only v-Tlac (absolute and relative values) was slightly but significantly increased by training. These results could be due to the fact that both men and women did not train more than 10% of the total distance run at exercise velocities equal to or higher than their Mav and did not increase their training load during the 8-week training period. We suggest that changes in training content during the season, such as severe (long-duration or high-intensity) training sessions, may have improved their performance capacity.     

极大代数意义下矩阵的行列单调性

本文讨论了一类很有用途的极大代数意义下的矩阵,给出了这类矩阵的行列单调性。     

论导数在函数中的应用

导数是微分学中最基本的概念,文章通过利用导数在求函数单调性、求函数的极值、求函数的最大值和最小值和求函数的极限等方面的应用分析,阐述了导数在研究函数中的重要性。     

关于武术套路技术内容单调、雷同倾向之研究

从现行武术竞赛规则、创编套路、技术功力、技术风格四个方面分析,近几年武术比赛中套路技术内容单调、雷同,观众急剧减少产生的原因,并针对产生原因提出相应的改进建议.