Spatial patterns of residents’ daily activity space and its influencing factors based on the CatBoost model: A case study of Nanjing,China

The complexity and fragmentation of people's activity space are challenging to planners. However, the relevant studies are mostly concerned on the relationship between the social attributes and the activity space of residents in a single or several communities, or the spatiotemporal laws of activity space on a macro scale. The research on the spatial characteristics of residents' activity space still needs to be strengthened. The present study analyses the spatial patterns of residents' activity space based on mobile phone signaling data to fill the gap of previous studies that assessed residents' activity space across small geographic areas. First, according to the spatial scope and direction of an activity space and residents' activity coverage rate, spatial patterns can be divided into three types: compact, extended, and directional extension patterns. The CatBoost method is then used to statistically analyze the influencing variables of spatial patterns, and the order of importance of the following influencing factors is determined: the built environment is more influential than social and economic situations. This study aims to strengthen the understanding of residents' activity space at the spatial level and provide a basis for the optimization of communities with different spatial patterns.     

The effect of land use planning (2006–2020) on construction land growth in China

Land use planning is a comprehensive instrument for managing non-agricultural land growth in China, and the evaluation of its implementation effect on growth control is of great significance for policy improvement. However, little empirical research has been done to estimate its implementation effect at the city level of the whole country. This study aims to evaluate the effectiveness of land use planning on construction land growth control at the city level in China. Taking 288 cities as the research object, an econometrics model was built to estimate the effect based on socioeconomic and land use data from 2006 to 2012. The results show that the implementation of land use planning has a certain effect in curbing the expansion of construction land, and that the incremental amount of construction land decreases by 107,449 ha due to the planning implementation. In addition, the implementation effect of land use planning presented significant differences among cities, which shows that there is a weaker effect in megacities and large cities than in medium-small cities. Besides, the implementation effect of land use planning also shows temporal differences: its effect is better in 2007–2009 than in 2010–2012. Furthermore, considering both planned goals and effectiveness, planning implementation is judged to be able to slow but not fully prevent the rapid expansion of construction land. Finally, to further improve efficiency and success, this research puts forward some suggestions such as improving the existing quota system, delineation of the urban development boundary and integrating the special plan system.     

Spatio-temporal patterns of intentional fires,social stress and socio-economic determinants: A case study of Malmö, Sweden

Since the end of the 1990s, the number of fires has increased dramatically in Malmö, a city in the southernmost part of Sweden. Between 1998 and 2009, the increase was 215%, and a large number of the fires were intentional. The aim of this paper is to deepen our understanding of the underlying causes of the spatial and spatio-temporal distribution of intentional fires in Malmö, and to analyse how different living conditions in Malmö sub-areas may determine the frequency of intentional fires. This paper׳s main contributions to the field is to operationalize theories of social stress into measurable variables and an index of living conditions (ILC), and to statistically and spatially analyse the underlying relationship between living conditions and intentional fires. One key conclusion is that the spatio-temporal patterns of intentional fires can be determined by different living conditions and different levels of exposure to socio-economic stressors. Another important finding is to emphasize the importance of analysing specific and local patterns of fire incidents and living conditions in order to utilize them in locally-adapted fire safety policy formulations and in implementing preventative measures.     

Assessment of groundwater depletion–induced land subsidence and characterisation of damaging cracks on houses: a case study in Mohali-Chandigarh area,India

Bulletin of Engineering Geology and the Environment - The present study identified groundwater depletion–induced land subsidence by spaceborne differential interferometric SAR (DInSAR)...     

Vanguard projects as relay races: A historical case study on the building of Eurocan pulp and paper mill, 1965–1970

Previous research recognises the strategic role of vanguard projects in providing their initiators with avenues for entering new markets or gaining mastery over innovative technologies. This study makes a contribution to this research by focusing on the extent to which vanguard projects are under control and serve the interests of their principal initiators and the other actors involved. Simultaneously, the present study contributes to project management research by applying historical case study methodology on Eurocan, a vanguard project that a major Finnish forest industry firm Enso established in the mid-1960s to the wilderness of British Columbia, Canada. Our historical analysis encourages regarding vanguard projects as relay races in which several actors participate, largely in unanticipated ways. This is especially because the initiation of vanguard projects appears to be characterised by both the heterogeneity of the actors involved, a wide variety of actions taken by these actors to increase their centrality in the project organisation as well as abrupt changes among them and their relative importance over the project lifecycle. Together these characteristics make vanguard projects particularly prone to influence from external actors and events.     

Spatial impact of urban expansion on surface water bodies—A case study of Wuhan,China

This study aims to raise the level of attention paid to surface water management issues in spatial planning and urban development processes. In the case of cities located in alluvial river plains, surface water bodies may occupy large areas but severe ecological and environmental consequences can arise if they are given insufficient weight in the planning and development processes. After discussing in general terms some of the connections between surface water bodies and urban land use we specifically examine the situation in Wuhan, one of the largest cities in China, which has many surface water bodies in its urban region. We measure and analyse land use changes between 1993 and 2004 to lakes and shallow water bodies and their riparian areas using data derived from detailed land use surveys of the city. Our results show that urban expansion has had a significant impact on Wuhan's surface water bodies and their riparian zones. The reduction, disappearance and pollution of surface water may contribute to the undervaluation of water bodies, thereby increasing the likelihood of further impacts taking place. An integrative and proactive land use planning and management system at regional strategic level and local action level is considered to be essential if surface water systems are to be conserved and improved. Increased recognition of their societal and ecological value should be reflected in more detailed attention to the spatial requirements of water bodies and riparian areas in urban planning policies.     

A case study on the soil–pile–structure interaction of a long span arched structure

Different concepts for modelling of soil-foundation in complete dynamic interaction analysis for a 110-m height 70-m span arched structure on 180 piles were investigated in this paper. The modelling approaches consisted of a sophisticated procedure to account for soil compliance and foundation flexibility by defining frequency-dependent springs and dashpots; namely, flexible-impedance base model. The results of this model were compared with those of the conventional modelling procedures; namely, fixed base model and flexible base model by defining frequency-independent springs. In the flexible-impedance base model, the substructure approach was employed through finite element modelling. To account for the kinematic interaction, the numerical model of the soil, foundation and piles were developed using a verified finite element model in ABAQUS. The free field time history and design spectrum were modified to obtain the foundation input motion. The impedance of pile groups with different length was obtained by the finite element model to assess the inertial interaction. The comparison of the results of the employed models showed that rocking and torsional responses were greatly affected by soil–structure interaction, indicating redistribution of seismic demands. It was also proven that the internal demands of the conventional model considering frequency-independent Winkler springs might be higher than those of the model including pile–soil–structure interaction effects.     

A Summary of the Academic Symposium on the Treatment and Management of City Wastes

With the continuous worsening of theproblems of urban wastes about 60 urbanscientific workers gathered in Guiyang to dis-cuss the present state of the treatment andmanagement of urban wastes and find rela-tive solutions to the problems.The“Guiyang Symposium on the Treat-ment and Management of City Wastes”jointly sponsored by the Chinese Urban Sci-entific Research Institute,the Urban Con-struction Department of the Ministry of Ur-     

Reprint of “An ‘unceasing war’ on land development on the urban fringe of Beijing: A case study of gated informal housing communities”

The existing literature about informal development in China's cities is dominated by studies of conventional informal housing in urban villages, while a new type of informal housing, gated informal housing communities, has rarely been studied. The paper aims to contribute to the existing literature by discussing why and how these gated informal housing communities were developed, looking at the case of Beijing. The results of the analysis show that institutional discrimination against rural areas with respect to land use rights, revenue redistribution, policymaking procedures and the hukou-related social welfare system the major drivers of development of informal communities. In particular, informal development is influenced by the ways land value is captured by, compensated for and allocated to the state government rather than rural villagers in the process of its transfer from rural to urban land. For future policy, more institutional innovation or reform is imperative in order to adequately deal with the emergence of gated informal housing communities. Institutionally inclusive land and housing policies, rather than intense top-down control, are needed in China.     

Project management and national culture: A Dutch–French case study

This case study explores the impact of national context in the integration of project management. It analyses the implementation of project management during a Dutch/French cooperation. Evaluation and monitoring are easily adopted by the Dutch whereas they are avoided by the French partners.     

Process,productivity, and economic analyses of BIM–based multi-trade prefabrication—A case study

Previous studies yielded contradicting results regarding the benefits of multi-trade prefabrication (MTP) based on building information modeling (BIM). This study investigates the causes of the contradicting results by analyzing the process, productivity, and economic benefits of BIM-based MTP through a case study. The process analysis results indicate that coordinating mechanical, electrical, and plumbing (MEP) systems took longer in MTP than in the conventional method because of the newly added offsite coordination activities. Nevertheless, the overall project duration was reduced because of the parallel execution of MTP and concrete work. The productivity analysis shows that the newly added MTP activities also increased person-hours. However, as the assembly process was repeated, the required person-hours decreased by 40% from that of the initial stage because of the learning effect. The case study revealed that the management of coordination activities and the selection of projects were critical for the successful implementation of BIM-based MTP.     

Property-rights regime in transition: Understanding the urban regeneration process in China – A case study of Jinhuajie,Guangzhou

A variety of stakeholders have proposed different models of urban regeneration of China, and indicate an institutional arrangement that is more complex than a model dominated by the government or neoliberal interests. This study argues that the path to an effective property-rights regime for urban regeneration has become circuitous as it has needed to follow the trial-and-error process of institutional transition in China. Operational-level rights originally assigned to different actors have been gradually reclaimed by the land users and by the effect of market forces through ‘property-rights regime in transition’. Four rounds of regeneration were observed in Jinhuajie, Guangzhou over the past three decades, indicating the adoption of four property-rights regimes that have evolved sequentially, namely, a semi-open market for neighbourhood redevelopment, a semi-open market for land occupied by state-owned enterprises, an open market for redevelopment and an open market for both redevelopment and refurbishment. Each property-rights regime only reassigns one or two bundles of operational-level property rights from one actor to another to provide opportunities for older organisations to adapt to the new system. This inevitably led to an interweaving urban fabric and sub-optimal results of urban regeneration. This research suggests greater attention should be paid to cases of regeneration in different contexts as well as the interactions among the various stakeholders.     

Effects of carbonate on the structure and properties of loess and the corresponding mechanism: an experimental study of the Malan loess,Xi’an area,China

Bulletin of Engineering Geology and the Environment - The structural, physical and morphological characteristics of loess will change as a result of the dissolution of mineral components, mainly...     

Macmillan’s martyr: the Pilgrim case,the ‘land grab’ and the Tory housing drive, 1951–9

The suicide of Edward Pilgrim in 1954 prompted a public furore over the easy terms on which public authorities could compulsorily purchase privately owned land for development. This article argues that Harold Macmillan, as Conservative Housing Minister after 1951, consciously prolonged the statist purchase provisions of the 1947 Town and Country Planning Act even as a reviving market in development land in the early 1950s made them unrealistic and inequitable. The Tories’ twin aims of abolishing the 1947 development charge and making good the ambitious 1951 election pledge to build 300,000 houses per year created an immensely complex set of problems which Macmillan negotiated with much skill. The result, though, was that local authorities – mostly Labour ones – eager to build houses benefited and many individual small owners like Pilgrim suffered from this policy. The Tory pledge was therefore realised in part by means of a hidden subsidy to municipal socialism and at the expense of many natural Conservative supporters.     

Effect of regional land subsidence on engineering structures: a case study of the 6 km long Su-tong Yantze River Bridge

The article reports a study of the influence of regional land subsidence on the 6.05 km long Su-tong Yangtze River Bridge. The characteristics of the major compressive geological layers and their potential to settlement are discussed in the light of the past and continuing groundwater exploitation in the area. A numerical model for land subsidence quantification was developed and used to predict the differential settlements along the bridge axis to 2050. There is a significant difference in the settlement occurring in the north and south areas of the bridge, in part due to the variation in the Quaternary alluvial sediments. The case study highlights the importance of considering both site specific and regional subsidence conditions when designing large structures in such an area.     

Contention for urban state space and the rise of society in China: A case study of “housing planting” in Hohhot

Existing literature has overemphasized the power of state in the theorization of China's urbanization and transition, and after the reform and opening-up, substantial attention has been given to the interaction between state and market. Comparatively, the role of society has been vastly underestimated. The paper selects housing planting in Hohhot to explain how local villagers contended actively with local states for and over space to increase compensation for land requisition. The contention has caused severe social conflicts, high compensation cost, and forced demolition, thereby threatening local states' land finance and development. Essentially, space has become a useful tool for citizens to preserve their interests. This implies that with the rise of society, China's urbanization is transitioning from a high-speed and low-cost stage to a high-quality and high-cost stage. Due to the changing relation between state, capital, and society, many pertinent institutions need to be adjusted as well. The paper calls for additional attention to the state-society-relation perspective when theorizing China's urban development.