Systems Of Urban Places

A method of “structural chains” is proposed for the analysis of regional urban systems. Each chain is made up of a sequence of numerical elements representing the average population of places at various levels of urban development, from small mining or forestry settlements to large polyfunctional cities of regional or national rank. The absence of a particular category in a region is marked in the chain by a zero. The structural chains of local urban systems can be grouped into tables reflecting the structure of a regional urban system and its local variations. The key characteristics of urban systems reflected by these chains are: the number of elements or levels of development; the number of zeros and their position in the chain, reflecting the degree of development of the urban hierarchy; and the height of the regional tables (number of horizontal rows), representing the number of local urban structures. The method is tested and illustrated by the urban systems of the Dnieper-Donets and Black Sea regions of the Ukraine, the Upper Volga region, and the urban system of the Tatar ASSR.     

ON HANDLING URBAN INFORMALITY IN SOUTHERN AFRICA

In this article I reconsider the handling of urban informality by urban planning and management systems in southern Africa. I argue that authorities have a fetish about formality and that this is fuelled by an obsession with urban modernity. I stress that the desired city, largely inspired by Western notions of modernity, has not been and cannot be realized. Using illustrative cases of top–down interventions, I highlight and interrogate three strategies that authorities have deployed to handle informality in an effort to create or defend the modern city. I suggest that the fetish is built upon a desire for an urban modernity based on a concept of formal order that the authorities believe cannot coexist with the “disorder” and spatial “unruliness” of informality. I question the authorities' conviction that informality is an abomination that needs to be “converted”, dislocated or annihilated. I conclude that the very configuration of urban governance and socio‐economic systems in the region, like the rest of sub‐Saharan Africa, renders informality inevitable and its eradication impossible.     

Recent Theoretical Paradigms in Urban Growth

The aim of this article is to present a critical view of the theoretical toolboxes developed in urban economics to explain urban city size. The article starts with the consideration that, during the 1960s and 1970s, the question of optimal city-size tended to be expressed in a misleading way. The real issue is not an “optimal city size” but an “efficient size”, which depends on the functional characteristics of the city and on the spatial organization within the urban system. Economies of scale exist up to a certain city size. However, urban development generates conditions leading to structural readjustments which lead to new economic advantages. These structural adjustments may be either sectoral transformations towards higher-order functions, or the emergence of external linkages with other cities. The article provides recent empirical evidence of the role played by urban functions and city networking in explaining urban equilibrium size. The empirical analyses reported here witness the importance of the structural adjustment of cities needed to achieve a higher equilibrium size.     

A Framework for Exploring Urban Retail Discontinuities. 探索城市零售业不连续性的框架

A key area in the analysis of urban structural evolution is identifying discontinuities. Effective analysis could improve long‐term forecasting and provide a better understanding of how to steer an urban system toward a desirable future state. We use a simple aggregate retail model to demonstrate an algorithm for identifying discontinuities in model parameter space. Explorations of retailing in both Greater London and South Yorkshire in the United Kingdom illustrate how understanding a system's potential for discontinuity can provide insights for both policy makers and retail businesses. The Harris and Wilson model, described in the section so‐named, is used as a simple archetype to illustrate the new framework. This model can be developed in a straightforward way to incorporate further refinement. In “ Executing the model and visualizing the results ,” we describe a single model run and in “ Investigating discontinuities ,” we explain our framework for detecting and analyzing discontinuities. “ Identifying discontinuities in the London retail system ” shows the results of applying this methodology to the Greater London retail system, and in “ Practical applications ,” we explore the policy applications for this technique as related to the decline of town centers in the South Yorkshire retail system. Some concluding comments are offered in “ Conclusions .”     

Dome Strengthening By Encircling Ties: A Monitored Experiment

This study describes a new strategy of conservation of historical monuments based on the combined use of monitoring analysis and empiric reappraisal. Over time, the mechanical behavior of domes—their lack of stability due to the horizontal thrusts generated by their self-weight—has been analyzed by architects and engineers, starting from the observation of damage. This process, which was mathematically demonstrated for the first time by the famous Viviani’s analysis of Santa Maria del Fiore in Florence, has provided over the centuries a number of enhancements in dome structural conception, thus leading to the final solution, referred to as encircling tie rod intervention. Based on these premises, the experimental case of Santa Maria del Quartiere dome in Parma, Italy, is discussed herein. Indeed, it has been considered a good opportunity to present the method used in its strengthening-intervention assessment, further validated by the monitoring system installed. In this monitored in-scale experiment, the empiric classical solution to the primeval dome’s thrust finds its confirmation and offers further possibilities of recalibration during time, thus indicating structural monitoring that may be described as a possible and desirable “alternative to intervention”, in step with “minimum intervention” and “reversibility” principles.     

The Influence of Local Urban Containment Policies and Statewide Growth Management on the Size of United States Urban Areas*

Abstract. In an attempt to slow the consumption of urban land for a given population, and the negative outcomes thought by some to be generated by such sprawl, regulations in the form of (i) the local imposition of urban containment policies that restrict or prohibit the amount and/or the type of urban settlement beyond a certain line and (ii) the statewide enactment of mandatory growth management requirements for all local governments have been enacted in the United States. This paper describes a regression‐based analysis that finds that different forms of these policies are achieving their desired goal of shrinking the square mile size of an urban area. A comparison of the influence of the various forms of urban containment and growth management policies with other “natural evolution,”“flight from blight,” and “fiscalization of land use” factors that also influence the square mile size of an urban area is made, and policy implications are offered.     

Estimating Rapidity of Change in Complex Urban Systems: A Multidimensional,Local‐Scale Approach

This study illustrates an exploratory approach based on a Multiway Factor Analysis (MFA) to estimate rapidity of change in complex urban systems, based on “fast” and “slow” variables. The proposed methodology was applied to 18 socioeconomic indicators of long‐term (1960–2010) transformations in 115 municipalities of Athens’ metropolitan area (Greece), including demography, land‐use/planning, and urban form and functions. Athens was regarded as a dynamic urban area with diversified structures and functions at the local scale, expanding through a self‐organized pattern rather than a centralized planning strategy. Athens’ urban system was described using nine supplementary (topographic and territorial) variables and 30 independent indicators assessing the local context in recent times. Exploratory data analysis found an increasing connectedness and redundancy among socioeconomic indicators during the phase of largest urban expansion (1960–1990). Only the rate of population growth was classified as a “fast” variable for all five decades investigated. The overall rapidity of change was higher in 1960–1970, 1980–1990, and 2000–2010, decades that coincided with specific phases of urban expansion driven by migration inflow, second‐home suburbanization, and Olympic games, respectively. Rapidity of change was high for functional indicators during all five decades studied, while demography indicators changed more rapidly in the first three decades and land‐use/planning indicators in the last two decades. Rapidity of change was highest in peri‐urban municipalities with a highly diversified economic structure dominated by industry. Our methodology provides a comprehensive overview of the transformations of a complex urban system, quantifying low‐level indicators that are rarely assessed in the mainstream literature on urban studies. These results may contribute to design policies addressing complexity and promoting resilience in expanding metropolitan areas.     

Multiagent Systems and the Dynamics of a Settlement System

In order to simulate the evolution of a system of settlements with a dynamic model, many processes must be integrated: the spatial aggregation of population, the complexification of urban activities, and the increasing hierarchical differentiation of settlements. The model must also simulate the progressive structuration of the settlement system through a growing variety and enlarged range of interactions between its elements. “Multiagent systems” provides a flexible modeling method for dealing with the multiple spatial interactions of cooperation and competition and relations that generate and regulate the evolution of a settlement system. Its principles are described and applied to building an evolutionary model, including a simulation tool. The model combines economic and spatial rules to produce birth, growth, decline, and functional diversification of the towns. The “urban transition” from an agrarian settlement system toward a hierarchical system of trade- and manufacturing-oriented towns and cities can be simulated.     

Deracinated Dispossessions: On the Foreclosures of “Gentrification” in Oakland,CA

This paper challenges dominant geographies of urban theory by conceptualising the dynamics of displacement in Oakland through place‐specific histories of racial/spatial politics. It argues that the repeated transposition of a San Francisco‐based model of “tech gentrification” results in deracinated dispossessions, or accounts of displacement uprooted from grounded histories of racial violence and resistance. It also argues that, while urban scholars acknowledge the role of historical difference in contouring dispossessions in metropolitan versus postcolonial cities, this consideration should be broadened to account for the racial/colonial dimensions of urbanism in the US as well. Treating Oakland as a “crossroads of theory”, this paper joins calls for a deeper engagement between postcolonial urban studies and critical race and ethnic studies from North America. Drawing upon the authors’ activist and empirical work, it contends that “thinking from Oakland” demands a foregrounding of racial capitalism, policing, and refusal.     

Urban Systems of Accumulation: Half a Century of Chilean Neoliberal Urban Policies

We analyse a half‐century of Chilean urban reforms to explain the introduction of a system of urban accumulation by dispossession of public resources and opportunities. Three stages have been conceptualised in the imposition of a neoliberal creative‐destructive process: proto‐neoliberalism, roll‐back and roll‐out periods. Empirical studies have traditionally analysed this process by examining a single urban policy's evolution over time. In this paper, we go beyond these types of studies by performing a systemic analysis of multiple urban policy reforms in Santiago, Chile. We use a genealogical thematic analysis to track changes in laws, government programmes and planning documents from between 1952 and 2014. Our analysis identifies different “urban systems of accumulation” by looking at the interplay of four urban policies: (1) urban planning deregulation; (2) social housing privatisation; (3) devolution of territorial taxes; and (4) decreased public service provision. Moreover, our multidimensional policy analysis in Santiago characterises a more radical, fourth expression in the creative destruction process of “accumulation by dismantling”. Consequently, we advocate for more multidimensional urban policy research that goes beyond a three‐period analysis in order to gain a deeper understanding of contemporary neoliberal creative‐destructive processes in variegated geographies.     

Physical and Numerical Approaches for the Optimal Insertion of Seismic Viscous Dampers in Shear-Type Structures

This article presents the results of an exhaustive parametric analysis which compares the performances offered by various systems (which lead to both classical and non classical damping matrices) of added viscous dampers in shear-type structures. The aim of the research work here presented is the identification of the system of added viscous dampers which maximizes the dissipative properties under an equal “total size” constraint. The choice of the systems of added viscous dampers considered in the comparison is carried out both using a numerical approach (based upon the use of genetic algorithms) and a physically based approach (based upon the properties of classically damped systems). The comparison is carried out through the numerical evaluation of the dynamic response of representative shear-type structures to both stochastic and recorded earthquake inputs. The results obtained using both approaches indicate that a damping system based upon the mass proportional damping component of the Rayleigh viscous damping matrix (referred to as MPD system) is capable of optimizing simultaneously a number of different performance indexes, providing the best “overall” damping performances. The MPD system is characterised by viscous dampers (a) which connect each floor to a fixed point and (b) which are sized proportionally to the corresponding floor mass.     

Creativity,Culture and Urban Strategies: A Fallacy in Cultural Urban Strategies

Two fields of knowledge have been of special importance for the emergence of culture-led urban planning in Norwegian cities: one concerns the understanding of the potential of culture as an economic driving force in urban regeneration, while the other focuses on the emergence of the concept of the “creative class” and has drawn attention to the importance of competence and creativity in urban development. Despite clear connections between the two fields, it may appear that false connections have been made in regeneration strategies in a number of cities. Based on analyses of the culture-led urban strategy of Kristiansand, a small Norwegian city, these knowledge fields are discussed and it is claimed that there seems to be a fallacy in how they are treated in the culture-led urban strategy. The fallacy concerns the way that creativity is equated with culture and further how theories about the emergence of the creative class are equated with a culture industry approach to urban planning. Questions are raised about the potential of culture industry strategies and it is argued that the potential for growth in small cities may not be as great as the public debate and research conducted in large metropolises might suggest.     

Rational Goals for the Urban Environment: A Swedish Example

In Sweden, the government's aim to create sustainable urban environments is expressed through the environmental quality objective “A good built environment”. The objective embraces seven sub-goals and is designed to guide central, regional and local authorities’ planning towards urban sustainability. However, for objectives concerning the urban environment, such as the Swedish objective “A good built environment”, to form a solid basis for decision-making, two types of rationality (functionality) conditions ought to be met. First, the objectives should guide and motivate those who are responsible for their implementation. This is applicable when the goals satisfy the criteria of precision, evaluability, approachability and motivity. Second, when the goals are parts of larger goal systems, the goal systems should be coherent. Using the objective “A good built environment” as an empirical basis, this article gives a few examples of how environmental goals can fail to guide and motivate action towards improved urban sustainability.     

Computer programmes for the correction of matrix effects in the XRF analysis of glass,ceramics and related silicate systems

The quantitative analysis of glass, ceramics and related silicate systems by means of energy dispersive X-ray fluorescence spectrometry is considered and problems arising from the selective absorption of X-rays in multi-element specimens are discussed. A computer programme written in FORTRAN and based upon a “semi-fundamental parameters” approach to the correction of matrix effects in glass and chemically similar materials is fully described. Model data are provided to enable the programme to be run and tested. An “empirical coefficients” computer programme for the quantitative analysis of silicate systems is outlined and the limitations of this type of programme are pointed out. The importance of adequate sample preparation prior to X-ray spectrometric analysis is stressed.     

“Brain Drain” or “Brain Gain”? Students’ Loyalty to their Student Town: Field Evidence from Norway

In the global economy regions fight a two-front “war” to attract young people. On the one hand, they compete against more urban areas because young people leave home to study and do not return to their home region (“brain drain”). On the other hand, they struggle to attract new residents, students and entrepreneurs to their local region (“brain gain”). The context is a student town of a strong industrial region characterized by a net export of young people and an increasing demand for highly qualified labour. The purpose is to gain insight into how student loyalty to a student town may be enhanced. A partial least square path modelling approach is used to estimate a structural equation model of student town loyalty. One finding is that the creation of student town satisfaction has more influence on student town loyalty than reputation building. “Social activity” is the most important loyalty driver. This antecedent is mediated through student town satisfaction and reputation, as well as university college reputation. The town municipalities and the university college should thus be coordinated in their effort to increase student town loyalty to bring down the “brain drain” and increase the “brain gain” in the region.     

The Making(s) of an Alternative Urban Policy: What Happens When Free Fares Come to Town?

While many urban policies and practices claim to offer an “alternative” to the “mainstream” of urban entrepreneurialism, they remain under-theorised and prone to alignment with entrepreneurial agendas. In this paper I examine fare-free public transport (FFPT) as a salient example of an alternative urban policy. Looking at Aubagne (France) and Tallinn (Estonia), I explore what happens when an alternative policy “comes to town”. I detect how FFPT enters local urban regimes, and study the (non-)participation of public transport passengers and workers in the decision-making process about whether and how to abolish public transport fares. My analysis reveals that albeit alternative policies such as FFPT seem to oppose entrepreneurialism, they may hinge on urban regimes that span across institutions, leave the local configurations of power unchallenged, and strenghten local elites. The adaptability of alternatives to diverse political and intellectual positions explains their resilience. Consequently, their radical character cannot be taken for granted and remains an object of political struggle.     

旅游具身体验研究进展与展望

20世纪90年代初,受具身理论启发,学界开始关注旅游与身体的关系,旅游具身体验研究取得长足进展,但系统的研究评述与反思尚付阙如。基于知识社会学视角分析,旅游具身体验研究经历了酝酿、探索和拓展3个阶段,研究成果分布在两个维度、六大领域,其中视觉、其他感官知觉、躯体觉体验构成具身体验的共通性层面,主要由生理身体决定;性别分异、身体障碍和身份认同下的具身体验则属于具身体验的差异化层面,强调了身体的建构性。这些成果推动了旅游体验研究的范式变革。针对当前在成果系统性、主题集中度和方法适用性等方面的不足,未来的研究迫切需要明确具身化对于旅游体验研究的范式意义,围绕“遭遇”“栖居”“展演”和“实践”等范畴建立核心命题,并且注意中西方理论资源的会通和新兴与传统研究方法的结合,以具身体验、具身实践、具身景观和具身营销为探索重心,完善和深化旅游具身体验研究的知识体系。     

An Exploratory and Reflective Process of Urban Spatial Morphology within Social Sustainability: Lessons from Middle Eastern Islamic Tradition

This article outlines the significant role of ideologies and values that lie beneath the physicality of the city, in reforming urban spatial morphology within a framework of social sustainability. We focus on the urban morphology of Middle Eastern cities, which have evolved within the framework of Islamic tradition, to illuminate the relationship between the ideological and physical dimensions of spatial morphology in all urban contexts. We examine the process by which a collective of religious, political, and cultural values underlying the physicality of the city have evolved into aesthetic conventions. This process played a crucial role in the maintenance of social and urban sustainability. We propose a form of “pattern language,” here termed the anatomical approach, that brings together the ideological dimension of a city's inhabitants and the physical characteristics of urban morphology. Such a model may help urban designers and architects to understand and create more responsive and friendly cities. It furthermore contributes to the planning education process by providing the essential knowledge and analytical foundation for site analysis and conservation of valuable contexts.