The geography of air freight: connections to U.S. metropolitan economies

Despite the rapid growth of air freight shipments, much of the existing literature on the geography of air transportation has paid more attention to passenger travel than air freight. The purpose of this paper is to elevate our understanding of air freight by determining which specific variables most influence and shape the geographic distribution of air freight by metropolitan area using stepwise regression analysis. The empirical results suggest a regression model of five independent variables was the most parsimonious solution where the final model accounted for 71.1% of the variation in air freight shipments by metropolitan area (MA). The most important predictor was the traffic shadow effect, where less populated MAs under the traffic shadow of larger MAs tended to generate lower levels of freight. The model also suggested that other key predictors included the employment market share in transportation-shipping-logistics industries, per capita personal income, the number of medical diagnostic and supplier establishments, and above average wages in high technology. Overall, metropolitan markets with diverse and efficient ground support systems, freight forwarders and other transportation services, a more affluent population, an intense agglomeration of medical laboratories and related suppliers, and a well paid skilled workforce engaged in computer systems design and electronic product manufacturing are more likely to ship freight by air.     

The life cycle of a metropolitan business network: Liverpool 1750–1810

Recently historians have complicated their understanding of networks. In particular, they have started to assess the role of networks in civic and formal arenas. This paper posits a quantitative methodology for a more nuanced and sophisticated analysis of mercantile networks within this environment. It uses visual analytics of Liverpool's business networks comprising political, trade, social and cultural institutions to assess their role in the changing social and economic climate during the period 1750–1810. This paper demonstrates the dynamic role of networks in the shaping of a metropolitan economy and the interplay between the two. In addition, it posits that, as is the case for regional clusters, there is a life cycle of networks. In this way, we are able to see how the networks sustained, nurtured and transformed social and economic activity during this period.     

基于城市气候环境分析的西安都市圈城镇规划引导

以西安都市圈城镇人居环境建设为研究背景,从城市气候环境分析的角度,针对本地区城市热岛效应及空气污染问题,分析城市空间布局与地理环境对城市气候的影响因素;以改善城市热舒适环境及空气质量为主要目标,对西安都市圈城镇规划提出建议,引导城镇发展格局,对不同尺度下的城市空间规划进行调整和完善,为城镇居民提供健康舒适的人居环境。     

Local property tax differences and business real estate values

This article posits a model of the effect of differences in changes in local property tax rates on changes in the business real estate tax base. It is also hypothesized that changes in the tax base influence changes in the property tax rate. Empirical findings for metropolitan Chicago are that both differences in property tax changes and levels have large effects on the growth of the value of business real estate. Also, changes in the property tax rate are found to depend upon changes in the tax base as well as the property tax level and its previous change.     

A measure of regional influence with the analytic network process

The metropolitan region is commonly defined by a socio-spatial network of urban nodes that are linked in territory and function. Such a network is differentiated by size and dominance of the linked nodes, characterized by physical or virtual flows of a wide-ranging variety. The analytic network process (ANP) is a multi-criteria analytic method that measures the influence or dominance of the nodes in a network with feedback. We illustrate how ANP determines county rank as a measure of influence in a metropolitan statistical area (MSA) defined by its interrelated socio-economic and spatial elements qualitatively and quantitatively. We compare the ANP results to similar measures of regional influence in the literature.     

都市圈旅游资源综合评价研究——以哈尔滨都市圈为例

针对现存的旅游资源评价存在的不足及都市圈这一特殊区域进行都市圈旅游资源综合评价体系研究。从可持续发展的角度出发,运用科学的统计数学和生态学中的相应模型,从多方面构建都市圈旅游资源评价体系,体系具体由四个层次组成:规范评价、旅游生态位评价、旅游资源群开发潜力评价、旅游地可持续发展评价。并以哈尔滨都市圈为例进行案例研究,以期为其他都市圈旅游资源合理利用提供借鉴。     

Metropolitan land-change science: A framework for research on tropical and subtropical forest recovery in city-regions

In efforts to promote transitions to sustainability in city-regions, government and nongovernment actors throughout the world are devising comprehensive sustainability strategies and implementing a variety of environmental policies. Social actors in many city-regions view forest stewardship as an important element of this integrated approach. Generally, urban sustainability goals are guided by the principles of ecological integrity, environmental quality, social equity, social inclusion, and social justice. In other words, sustainable urban development should foster a good quality of life for all by providing equitable access to adequate economic opportunity, housing, education, public services, ecosystem services, and environmental amenities. Governance structures should pursue these goals democratically with legitimacy, transparency, and accountability. Effective sustainability planning and management depend on the reliability of land-use monitoring and modeling approaches. They also require field-based, qualitative empirical research to understand the complex social dynamics that are invisible from space. The aim of this paper is to encourage international, cross-disciplinary dialogue on the conceptual, theoretical, methodological, and practical groundwork necessary to effectively carry out metropolitan land-change science, particularly for rapidly expanding small- and medium-sized cities in developing countries. I begin by presenting the paper's central conceptual and theoretical framework. Next, I explore existing analytical and methodological approaches to the study of land-use dynamics in metropolitan regions. After a brief discussion of specific opportunities and challenges for collaborative, interdisciplinary research in support of metropolitan land-change science, I conclude by proposing a four-part agenda for coordinated investigation of tropical and subtropical forest recovery in city-regions worldwide.