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Novel Methodologies for Preventing Crack Propagation in Steel Gas Pipelines Considering the Temperature Effect

Structural Durability & Health Monitoring 2025年第1期19卷 1-23页

作者： Nurlan Zhangabay Ulzhan Ibraimova Marco Bonopera Ulanbator Suleimenov Konstantin Avramov Maryna Chernobryvko Aigerim Yessengali department of Architecture and urban planning Mukhtar Auezov South Kazakhstan UniversityShymkent160012Kazakhstan department of Industrial Civil and Road Construction Mukhtar Auezov South Kazakhstan UniversityShymkent160012Kazakhstan Mechanics Sound&Vibration LaboratoryDepartment of Civil EngineeringCollege of EngineeringNational Taiwan UniversityTaipei10617Taiwan department of Reability&Dynamic Strength A.Pidhornyi Institute of Mechanical Engineering Problems of National Academy of Sciences of UkraineKharkiv61046Ukraine

Using the software ANSYS-19.2/Explicit Dynamics,this study performedﬁnite-element modeling of the large-diameter steel pipeline cross-section for the Beineu-Bozoy-Shymkent gas pipeline with a non-through straight crack,strengthened by steel wire *** effects of the thread tensile force of the steel winding in the form of single rings at the crack edges and the wires with different winding diameters and pitches were also *** results showed that the strengthening was preferably executed at a minimum value of the thread tensile force,which was 6.4%more effective than that at its maximum *** analysis of the inﬂuence of the winding dia-meters showed that the equivalent stresses increased by 32%from the beginning of the crack growth until the wire *** increment in winding diameter decelerated the disclosure of the edge crack and reduced its length by 8.2%.The analysis of the inﬂuence of the winding pitch showed that decreasing the distance between the winding turns also led to a 33.6%reduction in the length of the straight crack and a 7.9%reduction in the maximum stres-ses on the strengthened pipeline *** analysis of the temperature effect on the pipeline material,within a range from-40℃ to+50℃,resulted in a crack length change of up to 5.8%.As the temperature dropped,the crack length *** such a temperature range,the maximum stresses were observed along the cen-tral area of the crack,which were equal to 413 MPa at+50℃ and 440 MPa at-40℃.The results also showed that the presence of the steel winding in the pipeline signiﬁcantly reduced the length of crack propagation up to 8.4 times,depending on the temperature effect and design parameters of *** work integrated the existing methods for crack localization along steel gas pipelines.

关键词： Crack propagation ﬁnite-element internal pressure prestressing steel gas pipeline temperature effect

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Measuring Spatio-temporal Characteristics of City Expansion and Its Driving Forces in Shanghai from 1990 to 2015

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Chinese Geographical Science 2017年第6期27卷 875-890页

作者： TIAN Li LI Yongfu SHAO Lei ZHANG Yue department of urban planning Tsinghua University department of Architecture Shanghai University

urbanization has both direct and indirect impacts on land use change, and analyzing spatio-temporal characteristics of land use change is essential for understanding these impacts. By comparing Landsat TM images, this paper examines the changes of land use structure and landscape patterns in Shanghai from 1990 to 2015. It finds that the city doubled in size, with the growth of isolated construction land being most significant among eight land use types. A land use change matrix was established and landscape indices were selected to evaluate the change of spatial structure in Shanghai. In order to identify the main driving forces of city expansion in Shanghai, this research ran partial least square regression models to assess the impact of 10 social-economic factors on land use change of Shanghai from 1990 to 2015. It then conducted bivariate correlation analysis to explore the drivers of change of various land use types: urban settlement, rural settlement and isolated construction land. Besides quantitative analysis, this paper analyzes the influence of policy-dimensional factors in land use change. It concludes with future potential research topics on land use change in a rapidly urbanizing context.

关键词： urbanization land use change partial least squares regression driving forces Shanghai

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Social Construction Functions of Consumption Space under Stratification:The Case of Guangzhou

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Chinese Geographical Science 2010年第5期20卷 450-460页

作者： LIN Geng WANG Lianjun ZHANG Xiaoying department of urban and Regional planning/Center for urban and Regional Studies School of Geography and Planning SUN Yat-Sen University Guangzhou 510275 China

As Chinese cities rapidly transformed themselves into consumerist societies,the relationship between consumers and consumption space under stratification has become a new research area in the field of urban social *** on a consumer behavior analysis,this study explores the relationship between consumption space and the social strata of consumers in typical shopping malls in Guangzhou where the first shopping mall in China was *** result shows that shopping malls have performed significant constructive functions of organizing consumers from different social classes into different consumption *** middle-and upper-class consumers,the function of shopping malls centers on utilitarian consumption,identity recognition,and identity construction;whereas for lower-class consumers,its function revolves around pleasure and *** symbolism of consumption space is the underlying reason for shopping malls to have their social constructive *** findings of this research suggest that:1) a shopping mall is a productive consumption space and a geographical space with subjectivity;2) the micro-location of a shopping mall has social construction function;and 3) symbolic consumption is the core of social construction.

关键词： consumption space stratification shopping mail social construction social identity symbolic consumption

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Evaluating urban public facilities of Shenzhen by application of open source data

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Geo-Spatial Information Science 2016年第2期19卷中插4-中插4,129-139页

作者： Miaoxi Zhao Gaofeng Xu Yun Li department of urban planning South China University of TechnologyGuangzhouChina department of Geography Ghent UniversityGhentBelgium department of urban planning Shenzhen UniversityShenzhenChina

This article applies open source data of public facilities through data mining, not only to evaluate the public facilities from an objective dimension, but also to reflect the sensory opinions of the group factually, eventually realizing the evaluation measurement of urban public facilities. The research takes Shenzhen city as an empirical case and chooses typical public facilities to mine data, resolve address and weight to explore the application of public facilities evaluation under dimension reduction of open source data. The empirical study consists of three parts. first, as the objective evaluation, we estimate the density distribution and per capita of public facility through data mining and address resolution. Second, as the subjective evaluation, we carry on the location analysis to high-score public facility through attention and satisfaction data of Internet evaluation. finally, as mentioned above, we calculate the weight of objective and subjective evaluation of public facility, eventually formatting the comprehensive evaluation of public facilities.

关键词： Open source data big data public facility Shenzhen

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Regional Impact of Cyclone Sidr in Bangladesh: A Multi-Sector Analysis

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International Journal of Disaster Risk Science 2016年第3期7卷 312-327页

作者： Afsana Haque Sarwar Jahan department of urban and Regional planning Bangladesh University of Engineering and Technology(BUET)

This research investigates the impact of cyclone Sidr on six regional economic systems of Bangladesh. The study uses secondary data on direct damages and corresponding changes in consumer spending and public/private investment expenditure. It employs input–output modeling and simulates the changes in national and regional output,income, and employment due to cyclone Sidr. Our findings indicate that coastal regions of Bangladesh—Barisal,Chittagong, and Khulna—are more vulnerable to cyclone disaster than are other parts of the country. The cycloneinduced loss of output is highest for Chittagong Division and income and employment losses are greatest in Barisal Division. The most affected sectors are housing services,agriculture, construction, and industrial activities. But sectoral losses vary widely across the regions. This research also finds that the present state of consumer spending and investment expenditure is not great enough to handle cyclone-induced output, income, and employment losses. It argues that investment decisions must consider regional patterns of output, income, and employment losses in different economic sectors to ensure cyclone-resilient development in Bangladesh.

关键词： Bangladesh Cyclone Sidr Input-output model Regional impact Sectoral impact

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Population Growth and Sustainability of Common Property Resource Management Systems in the Eastern Hindu Kush:The Use of Communal Fodder Resources in Mehlp Valley,North Pakistan

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Journal of Mountain Science 2009年第4期6卷 380-393页

作者： Fazlur-Rahman department of Geography urban & Regional planning University of PeshawarUniversity Town

In common property studies,increasing number of users has been considered as a major threat for the long-term sustainability of natural resources. This perception has been true in a few cases. However,the 40-years empirical research conducted in a variety of environmental settings,reveals that population pressure is not the only factor responsible for the degradation of natural resources. In remote areas,where the local inhabitants highly depend on available natural resources for subsistence livelihood,the economically important resources are kept under different ownership regimes. The local inhabitants have established autochthonous insti-tutions,and formulated rules and regulations for proper management of these resources. In this paper an attempt has been made to explore the response of a small fodder user community to the increasing population. For this purpose a micro-level study has been conducted in a remote mountain environment in the eastern Hindu Kush. For this research,data has been collected through fieldwork and focus group discussion. The results of this study reveal that fodder user communities have responded very well to the problem of population pressure. To maintain equity and long-term sustainability they have adopted a number of strategies including changing the ownership,and a resource kept under private ownership at the time of low population has been changed to a common property with increase in population. Based on this study it can be concluded that in mountainous areas and fragile environment the local inhabitant have both the capacity and capability to change their behaviour with regard to changing resource productivity as well as increasing number of users,and this situation does not always lead to the tragedy of commons.

关键词： Mixed mountain agriculture Tragedy of the commons Livelihood strategies Population growth

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Downtown Retailing Development Under Suburbanization——A Case Study of Beijing

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Chinese Geographical Science 2007年第1期17卷 1-9页

作者： CHAI Yanwei SHEN Jie LONG Tao department of urban and Regional planning Peking University Beijing 100871 China

The role of retailing has diminished in the center of cities of Western countries since its heyday in the 1920s. This trend was caused by violent transformations in the economic, social and locational contexts which involve resi- dential suburbanization, as well as new forms of commercial development out of town. As far as transforming China is concerned, the downtown retailing center has also come to turning point of development in the context of suburbaniza- tion. Based on the survey of Beijing residents’ shopping behavior, the present research tends to making clear the actual change and development problem of downtown retailing center. Combining with the macro retailing environment, re- lated influencing factors are further discussed too. Study results show that downtown retailing still plays an important part in resident’s shopping activity. However, with rapid urban sprawl, retailing in urban center has been greatly threatened by booming out-of-town commerce. In the course of such spatial change, the suburbanization of resident, the prevalence of new commercial forms and the change of consumers’ life style all have exerted their own pressure on downtown retailing. But for the special socioeconomic background of development and the support of government policy, it will still keep its vitality of retailing for a long period of time.

关键词： downtown retailing center consumer behavior suburbanization questionnaire survey Beijing

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Institutional Capacity and the Roles of Key Actors in Fire Disaster Risk Reduction: The Case of Ibadan, Nigeria

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International Journal of Disaster Risk Science 2022年第5期13卷 716-728页

作者： Olusegun Joseph Falola Samuel Babatunde Agbola department of urban and Regional planning Lead City UniversityIbadan 200255Oyo StateNigeria department of urban and Regional planning University of IbadanIbadan 200284Oyo StateNigeria

Inefficient and ineffective fire management practices are common to most urban areas of developing *** cities are typical examples of high vulnerability and low preparedness level for fire *** study examined the institutional framework for fire disaster risk reduction(FDRR) and explored the roles of key actors in fire disaster preparedness in Ibadan,a large traditional city in *** study was anchored on the concept of urban governance.A case study research design was adopted using primary and secondary *** data were obtained through field observation aided by a structured checklist and key informant *** were conducted on key officials of the major organs for FDRR-Oyo State Fire Service(OSFS) and Oyo State Emergency Management Agency(OYSEMA).The study identified a disjointed and fragmented approach to fire *** relating to fire risk reduction and disaster recovery were domiciled under the OYSEMA,while emergency response to fire disasters was the prerogative of the *** results show that only five out of 11 local government areas had public fire stations;only three fire stations had an on-site water supply;three fire stations lacked firefighting vehicles;and distribution of fire stations and facilities was *** fire stations responded to 80% of all fire cases in 12 *** study concluded that the institutional structure and resources for fire risk reduction was more empowered to respond to fire disaster,rather than facilitating preparedness capacity to reduce disaster risk.

关键词： Disaster preparedness Disaster risk Fire disaster Fire service Fire station

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A Theoretical Framework and Methodology for urban Activity Spatial Structure in E-society: Empirical Evidence for Nanjing City, China

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Chinese Geographical Science 2015年第6期25卷 672-683页

作者： WANG Bo ZHEN Feng WEI Zongcai GUO Shu CHEN Tingting department of Geography the University of Hong Kong School of Architecture and urban planning Nanjing University department of urban planning and Design the University of Hong Kong department of Building and Real Estate the Hong Kong Polytechnic University

The existing researches on the influence of information and communication technology （ICT） are mainly focused on human activity, whilst with few efforts on urban space. In the e-society, the widespread adoption of 1CT devices not only affects almost every aspect of people＇s daily life and thereby reshapes the spatial development of regions and cities, but also generates a large amount of real-time activity data with location information. These georeferenced data, however, have relatively recently attracted attention from geographers. Adapted from Lynch＇s framework based on people＇s perceptions, this paper proposes a framework of urban spatial struc- ture based on people＇s actual activity, including five elements, namely activity path, activity node, central activity zone （CAZ）, activity district, and activity edge. In the empirical study, by using one week＇s check-in tweets （from February 25 to March 3 in 2013） collected in Nanjing City, the five elements are recognized and analyzed. Through the comparison between our results and urban spatial structure based on population （and land use）, we argue that ICT uses： 1） lead to polarize, rather than to smooth, the urban structural hierarchy, due to the dual role of distance; 2） enable a partial decoupling of activity and activity space node, which challenges our conventional under- standing of the role of home and the utility of travel; 3） blur the boundaries of activity districts and hence may play a positive role in enriching districts＇ functions, which should not be overlooked in the current urban transformation in China.

关键词： information and communication technology (ICT) tele-activities activity space big data e-society Nanjing City

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A Framework for Assessment of Water Poverty in Iran

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Chinese Journal of urban and Environmental Studies 2023年第4期11卷 72-99页

作者： Maryam SERESHTI Mojtaba VALIBEIGI Neda SAFARI department of urban planning Guilan University department of Architecture and urban planning Buein Zahra Technical University department of Geography Planning and Environment

The water shortage crisis is one of the main concerns that is threatening the biological security in Iran. According to available data and information, providing a framework for the assessment of water poverty in Iran seems crucial. The land-dividing unit in Iran is the province, and most of the governmental information is gathered based on this unit. In this sense, Isfahan province, which is one of the central provinces in Iran that is suffering from water crises, has been selected. The water poverty index(WPI), which is adopted in accordance with Iran's situation, including five components of resources, access, capacity, use, and environment, has been used for each of Isfahan's cities. “Capacity” and “use” has the greatest correlation, and it seems any advancement in water utilization for economic purposes might result in increased capacity, and vice versa. Also,there is a positive correlation between WPI and components of access, capacity, use, and environment. It can be interpreted that the lack of access to water services may be due to a lack of income or education. Finally, access, capacity, and use showed the strongest relationships between WPI and its subcategories. Therefore, these three elements should be the main focus of any initiative to manage the water poverty in Isfahan province.

关键词： Climate change water issues human development drought Isfahan

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