A Spatial Search-Location Model of Retail Centers

Central place theory can be modeled using two types of optimization problems. Location-allocation models have been widely applied to operationalize central place theory as an aggregate optimization problem. This paper constructs a spatial search-location model to formulate central place theory as an individual optimization problem.     

A Climatic Model of Urban Energy Budgets

A deductive model of the energy budgets of urban landscapes, based on the exchanges of energy, mass, and momentum, is introduced. The absorption of shortwave and longwave radiation and their dissipation via the channels of reradiation, convection, conduction, and evaporation are generated by the model in order to simulate the interplay of the many energy cascades among the myriad of city surfaces. A city can be geographically analyzed by determining its energy budget and resultant surface temperatures on a block-by-block basis. In spite of some simplifying assumptions, the predictions of surface temperatures of this initial model compare favorably with observations.     

Commuting Distances and Gender: A Spatial Urban Model

In any urban center the commuting distances are a function of the spatial structure of the center and of the characteristics of the commuters. In this paper theoretical relationships between commuting distances and distances of residences to city centers are derived for monocentric and polycentric cities. These relationships are then linked to the sociological determinants of commuting distances. An econometric model encompassing both spatial structure variables and social variables is constructed and estimated using data for sixteen urban centers. Gender differences are focused upon. The expansion method is used.     

A Model for Measuring the Sustainability Level of Historic Urban Quarters

The main aim of this paper is to propose a model for measuring the sustainability level of historic urban quarters and to indicate an appropriate strategy for their revitalization. Based on this aim, this study first presents the theoretical review on the concept of “revitalization”, and its relationship with sustainability; next, it introduces the characteristics, role, selection process and scaling method of sustainability indicators, which are essential for measuring the level of sustainability. The paper then, as the main contribution of this paper, proposes the model for measuring the level of sustainability in historic urban quarters and determines some proposals to achieve revitalized and sustainable historic urban quarters. Depending on the proposed model, there is a direct relationship between type and the level of obsolescence (revitalization) and the level of sustainability in the physical, economic and social structures of a particular area. Therefore, when the level of sustainability is high in any one of these three structures, it means that the level of obsolescence is low in the same structures of an historic urban quarter. The result of this paper leads us to say that, the level of sustainability is a new (additional) input in the strategic planning process of revitalization and sustainable urban revitalization of historic urban quarters. Finally, the paper concludes with a brief summary on the general arguments of the paper.     

A Mathematical Method for Partitioning a Territory

Two regional characteristics—contiguity (connectivity) and compactness—are described mathematically. An integer programming model is constructed to allocate a system of points optimally (in terms of the compactness criterion) to subgroups whose number is not given beforehand. The conditions that each element of the regional breakdown must satisfy are given in the form of linear constraints of the regional population structure.     

Congestion Tolling and Urban Spatial Structure

According to the standard model of urban traffic congestion and urbanspatial structure, congestion tolling results in a more concentrated city. In recent years, a new model of rush-hour urban auto congestion has been developed that incorporates trip-timing decisions—the bottleneck model. In the simplest bottleneck model optimal congestion tolling without toll-revenue redistribution has no effect on trip price because the efficiency gainsexactly equal the toll revenue collected. Optimal congestion tolling then has no effect on urban spatial structure. This paper formalizes and extends this result.     

上海城市娱乐区布局结构及特点研究

城市娱乐区是城市化的产物.本文通过对上海城市娱乐区空间分布结构的实证研究,揭示了娱乐区空间布局遵循中心地理论的内在逻辑性;并且从娱乐区布局模式、娱乐区空间分隔距离的规律性和娱乐区功能的二元性等角度阐述了上海城市娱乐区布局结构的基本特点.     

A Note on the Geographic Interdependencies of Retail Market Areas

Central place theory describes an orderly hierarchy of places, with particular retail services developing for lower-ordered places as they reach a threshold. Yet it is likely that nearby areas could serve simultaneously as a source of demand and a source of competing supply for retail stores in a place. This paper contributes to the understanding of local economic development by modeling and estimating the geographic interdependence between a place and its neighboring areas. The simultaneous equation Tobit results suggest that such geographical interdependence exists for most retail industries, with spatial competition on the supply side being particularly important.     

The Structure and Context of the Urban Growth Coalition

This article examines the perception of local chambers of commerce regarding the urban growth coalition, and compares their observations with those of contemporary urban theorists. The chambers perceive the developmental community as dominated by business groups associated with land-use intensification and by elected officials. The chambers see manufacturing, retail, and service-sector firms as part of a less prominent constellation of developmental actors, and perceive virtually no developmental role for neighborhood or environmental groups.     

国内城镇居民旅游消费结构分析

本文通过对国内城镇居民旅游者人均天花费构成比例的横向和纵向比较,分析城镇居民旅游者旅游消费结构的现状和变化规律,找出影响旅游消费结构的因素。     

明清北京城市社会空间结构概说

对明清时期北京城市的社会空间结构进行探讨,是从城市地理学与城市社会学的视角所作的历史研究.从其内部分区的人口密度可以看出,明清时期北京城市在空间上具有一些新的特点,且在不断变化,而这些特点和变化又分别体现在该时期北京的商业空间、居住空间和社会生活与人际交往空间等方面,由此可以使我们更加深刻和全面地了解明清北京城市的发展程度.