舞蹈的动与静

《乐记》有云:诗,言其志也;歌,咏其声也;舞,动其容也。自古也就有黎民社稷,以舞见兴衰的说法,可见舞蹈与人们的生活是息息相关的。古人在劳动中创造舞蹈,在舞蹈中美化劳动。从某个意义上讲,舞蹈发展史也就是人类的发展史。     

Learning‐by‐Exporting Revisited: The Role of Intensity and Persistence*

Two non‐mutually exclusive hypotheses can explain the empirically established export premium: self‐selection of more productive firms into export markets and learning‐by‐exporting. This paper focuses on how the temporal dimension of firms' exporting activities and the intensity of exports influence the scope of learning effects. Using a panel of Swedish firms and dynamic generalized method of moments estimation, we find a learning effect among persistent exporters with high export intensity, but not among temporary exporters or persistent exporters with low export intensity. For small firms, exports boost productivity among persistent exporters with both high and low export intensity, but the effect is stronger for persistent export‐intensive small firms.     

How do new ventures grow? Firm capabilities, growth strategies and performance

While new venture growth performance has been studied extensively, little work has been done to examine the complex strategic choices through which growth is pursued and attained. Building on the resource-based view and social capital perspective, this study develops a conceptual framework that links combinations of ventures' (1) technological, (2) financial, and (3) networking capabilities to different growth strategies in terms of organic growth, partnership, and acquisition. We further assess the mechanisms through which a new venture's growth choices affect firm performance. Using data from 238 new high-tech ventures in China, we find that new ventures with different resource combinations follow different growth strategies. While partnership growth leads to greater product diversity, and acquisition is more effective in realizing firm internationalization, both lead to a better chance of survival of new ventures. In addition, the study explicates the role of technological capability in moderating the relationship between growth strategies and new venture performance.     

并联混合动力汽车性能仿真分析

文章建立了并联混合动力汽车的动力性能数学模型,并在MATLAB平台下开发了并联混合动力汽车动力性能仿真软件系统。基于此软件,对某并联混合动力汽车的动力性能进行了仿真,并将其与试验结果进行了对比,证明了模型的有效性。最后,依据仿真结果,分析了影响并联混合动力汽车动力性能的各项参数,并据此提出了改进其性能参数以提高其动力性能的方法。     

FDI驱动型集群演化机制及其锁定效应

对广东东莞 IT 制造业集群的案例考察发现.本地集群创新网络将随着外资企业的角色演化和战略转变,依次经历四个演化阶段,形成以外资企业为核心的创新组织机构,并有效推动本地集群创新网络的升级。但集群企业对外资企业的过度依赖,容易降低其自主创新能力,形成集群企业自主创新能力不足的路径依赖,使本地集群企业长期被锁定在全球价值链的低端。     

动态网络下多源多汇应急疏散问题算法

提出了一个时间依赖容量约束的动态网络下多源多汇的人群应急疏散问题,基于分组疏散的思想和TAG时间依赖网络的最短路算法,设计了一个启发式求解算法。算法将多源多汇问题转化为单源单汇问题,对各源点的待疏散人群采取分组疏散,并为每组人群找到一条满足时变容量约束的最早到达时间的路径及时刻表。最后进行了方法的应用分析。该算法能适用于大规模时变网络的人群应急疏散。     

巧用英文电影提高英语应用能力

英文电影作为一种英语教学资源,可以直观、形象地帮助学生积累词汇、提高听说能力、巩固语法以及增强文化意识,从而提高英语实际应用能力。     

Determinants of violent and property crimes in England and Wales: a panel data analysis

We examine various determinants of property and violent crimes by using police force area level (PFA) data on England and Wales over the period of 1992–2008. Our list of potential determinants includes two law enforcement variables namely crime-specific detection rate and prison population, and various socio-economic variables such as unemployment rate, real earnings, proportion of young people and the Gini Coefficient. By adopting a fixed effect dynamic GMM estimation methodology we attempt to address the potential bias that arises from the presence of time-invariant unobserved characteristics of a PFA and the endogeneity of several regressors. There is a significant positive effect of own-lagged crime rate. The own-lagged effect is stronger for property crime, on an average, than violent crime. We find that, on an average, higher detection rate and prison population leads to lower property and violent crimes. This is robust to various specifications. However, socio-economic variables with the exception of real earnings play a limited role in explaining different crime types.     

基于上下游企业不对称信息博弈的供应链应急协调

以供应系统的突发事件为研究对象,确定制造商作为供应链中的核心企业,引进紧急系数的概念,实现突发事件下对供应品的分类管理,在此基础上以制造商获得供应商告知实情、防止劣质产品供应以及期望收益的最大化为准则,对供需双方冲突进行博弈分析,给出期望收益的趋势图,并从时间、收益等多个维度刻画突发事件可能造成的危害和可挽救度,建立不同等级供应品的供应系统动态应急模型,分多阶段对突发事件进行动态协调,得到不同等级供应品的应急预案流程,促进突发事件的快速恢复,最后选取实际案例,对模型的可行性进行验证。