Social mix revisited: within- and across-neighborhood ties between ethnic minorities of differing socioeconomic backgrounds

Creating social mix in neighborhoods has been an important urban policy during the past years. The aim is the development of category-crossing ties between the middle and lower classes. However, studies found little evidence of such ties. This paper identifies two reasons why this might be the case. First, studies usually analyze the resource flow from native middle classes to disadvantaged residents. Second, the resource flow is analyzed within one neighborhood only. Based on interviews and network analysis with second generation, upwardly mobile Turkish-Germans in Berlin, I show that they act as cultural and language brokers, benefiting lower class co-ethnics. They provide exactly the information and resources to people with a lower class background that are envisioned by social mixing programs. Moreover, the resource flow occurs within but also across neighborhoods, whereby ‘second neighborhoods’ such as the previous neighborhood or the neighborhood where the workplace is located are particularly important.     

Differential Effects of Cognitive and Structural Social Capital on Empowerment in Two Community Ecotourism Projects in Ghana

Researchers have cautioned against both erasing conceptual complexities and homogenizing communities in community-based natural resources (CBNRM) studies and interventions. Social capital is seen as an enabler of CBNRM, yet we argue that differential access to social capital and associated outcomes deserves greater attention to avoid oversimplification of community interventions. Drawing upon literature on social networks and social capital, we analyze survey and network data from two community ecotourism cases in Ghana to advance understanding of the empowering capacities and limitations of CBNRM through social capital access. Subpopulations within communities are considered. Results show that residents with greater access to social capital report greater levels of empowerment. However, that relationship seems to be conditioned by one’s involvement, demographics, and by the empowerment dimension under analysis. Implications of the differing relationships between cognitive and structural social capital in relation to several empowerment outcomes are discussed from theoretical, methodological, and practical perspectives.     

产业集群的地方嵌入与全球生产网络链接——以上海文化创意产业园区为例

以全球生产网络理论为基础,通过问卷调查和深度访谈法,再现了上海创意产业集群在地方—区域—全球三个不同地理维度的产业链接网络结构和联系强度,运用三角坐标法分别考察上海创意产业在劳动力市场、外部供给、消费市场、合作关系四个产业链环节的地方嵌入性和全球链接性,探讨学习和创新网络的重要作用。研究结果显示：首先,上海创意产业集群在各个产业链环节都表现出很强的地方黏性,尤其是在地方劳动力市场方面,上海创意产业集群的地方嵌入性最为显著。其次,上海创意产业集群的外部链接存在异质性,其中技术类创意部门与文化类创意部门在劳动力市场、消费市场和合作关系等方面均表现出较大差异,本文从知识分化视角出发对以上异质性进行了解释。最后,总结了上海创意产业集群全球生产网络的基本特征及其地方—全球互动关系,为揭示中国大都市地区文化创意产业集群的地方嵌入和全球网络形成机理提供了详实的案例分析。     

Hierarchy,clusters, and spatial differences in Chinese inter-city networks constructed by scientific collaborators

The Chinese urban system is currently experiencing a fundamental shift, as it moves from a size-based hierarchy to a network-based system. Contemporary studies of city networks have tended to focus on economic interactions without paying sufficient attention to the issue of knowledge flow. Using data on co-authored papers obtained from China Academic Journal Network Publishing Database (CAJNPD) during 2014-2016, this study explores several features of the scientific collaboration network between Chinese mainland cities. The study concludes that: (1) the spatial organization of scientific cooperation amongst Chinese cities is shifting from a jurisdiction-based hierarchical system to a networked system; and (2) several highly intra-connected city regions were found to exist in the network of knowledge, and such regions had more average internal linkages (14.21) than external linkages (8.69), and higher average internal linkage degrees (14.43) than external linkage degrees (10.43); and (3) differences existed in terms of inter-region connectivity between the Western, Eastern, and Central China regional networks (the average INCD of the three regional networks were 109.65, 95.81, and 71.88). We suggest that China should engage in the development of regional and sub-regional scientific centers to achieve the goal of building an innovative country. Whilst findings reveal a high degree of concentration in those networks - a characteristic which reflects the hierarchical nature of China’s urban economic structure - the actual spatial distribution of city networks of knowledge flow was found to be different from that of city networks based on economic outputs or population.     

带有Le'vy噪声的中立型神经网络的反馈控制

针对延迟中立型神经网络系统,研究了反馈控制问题.考虑了带有Le''vy噪声的中立型神经网络,建立了一个适当的Lyapunov函数.通过Lyapunov分析方法并使用一般性Itô公式和LMI技术,得到了闭环系统的均方稳定性准则.最后,通过数值例子证实本文方法的有效性.     

Polarization of climate politics results from partisan sorting: Evidence from Finnish Twittersphere

Prior research shows that public opinion on climate politics sorts along partisan lines. However, they leave open the question of whether climate politics and other politically salient issues exhibit tendencies for issue alignment, which the political polarization literature identifies as among the most deleterious aspects of polarization. Using a network approach and social media data from the Twitter platform, we study polarization of public opinion toward climate politics and ten other politically salient topics during the 2019 Finnish elections as the emergence of opposing groups in a public forum. We find that while climate politics is not particularly polarized compared to the other topics, it is subject to partisan sorting and issue alignment within the universalist-communitarian dimension of European politics that arose following the growth of right-wing populism. Notably, climate politics is consistently aligned with the immigration issue, and temporal trends indicate that this phenomenon will likely persist.     

Seawalls or social recovery? The role of policy networks and design in disaster recovery

This mixed-methods study examines the case of 30 advisory committees across 25 municipalities in Miyagi and Iwate Prefectures in northeast Japan after the 3/11 triple disasters. Drawing on synthetic control experiments, social network analysis, and case studies, we test whether the design of these committees’ policies or the traits of these committee networks improved the recovery trajectories of municipalities. We find that communities highly connected to this network of advisory committees saw better economic recovery than expected, especially when researchers, hyper-connected individuals, or plans for community centers were involved, controlling for disaster damage, infrastructure quality, social vulnerability, governance capacity, emergency services, and social capital. Our results bring with them a number of concrete policy recommendations for disaster managers, local residents, and decision makers.     

From the regulation of space to the space of regulation

For about ten years, economic geography has enjoyed a renewal. Many researchers have found anchorage in different theoretical currents in order to analyse current economic changes. Regulation theory has been particularly inspirational in these considerations. This article represents a balance between different axes of research in regional economics, and their encounters with regulationist ideas. The main schools of thought are presented in chronological order with the prominent actors and the research results underlining the principal elements from each school. Finally, some prospects for the future are outlined. This revised version was published online in July 2006 with corrections to the Cover Date.     

Measuring urban activities using Foursquare data and network analysis: a case study of Murcia (Spain)

Among social networks, Foursquare is a useful reference for identifying recommendations about local stores, restaurants, malls or other activities in the city. In this article, we consider the question of whether there is a relationship between the data provided by Foursquare regarding users’ tastes and preferences and fieldwork carried out in cities, especially those connected with business and leisure. Murcia was chosen for case study for two reasons: its particular characteristics and the prior knowledge resulting from the fieldwork. Since users of this network establish, what may be called, a ranking of places through their recommendations, we can plot these data with the objective of displaying the characteristics and peculiarities of the network in this city. Fieldwork from the city itself gives us a set of facilities and services observed in the city, which is a physical reality. An analysis of these data using a model based on a network centrality algorithm establishes a classification or ranking of the nodes that form the urban network. We compare the data extracted from the social network with the data collected from the fieldwork, in order to establish the appropriateness in terms of understanding the activity that takes place in this city. Moreover, this comparison allows us to draw conclusions about the degree of similarity between the preferences of Foursquare users and what was obtained through the fieldwork in the city.     

超高层建筑施工监测内容及技术体系研究

超高层建筑施工监测(即第三方监测)对于检核施工质量,保障施工安全具有重要意义。目前,超高层建筑施工监测存在缺乏统一、规范的内容及技术体系,激光投点时对塔体摆动影响关注不够等不足。为此,在采用多种先进仪器设备,构建超高层建筑施工监测较完备科学的内容体系和技术体系,并解决以上缺点。文中对基准平面控制网的建立与维护,施工控制网竖向传递复测,轴线检测,电梯井、核心筒垂直度测量,施工控制网高程基准竖向传递检测,建筑物沉降观测等6方面内容做系统阐述,研究成果已成功应用于广州市多栋超高层建筑施工监测中,具有重要示范意义。