Buckling of super ellipsoidal shells under uniform pressure

This article is concerned with the elastic buckling of super ellipsoidal shells under external uniform pressure. The middle surface of a super ellipsoidal shell is defined by the following equation: (x/a)²ⁿ +(y/b)²ⁿ + (z/c)²ⁿ  = 1 where n is an integer varying from unity to infinity. It is clear from the equation that the range of shell shapes covered sphere (n = 1, a = b = c) to cube (n = ∞, a = b = c) and ellipsoid (n = 1) to cuboid (n = ∞). By adopting a recently proposed solid shell element for the buckling analysis, the critical buckling pressures of thin to thick super ellipsoidal shells are obtained and tabulated for engineers. The shell element allows for the effect of transverse shear deformation, which becomes significant in thick shells. Their buckling shapes are also examined. In addition, a simple approximate formula for predicting the critical buckling pressure of thick spherical shells is proposed.     

Sense of place and mental wellness amongst African immigrants in Canada

This study examines the effects of self-perceived mental wellness and other socio-economic variables on sense of place amongst Ghanaian and Somali immigrants living in Hamilton, Ontario. Research results are based on the analysis of survey questionnaires (n = 236) of Ghanaian and Somali immigrant adults, with recent (0–5 years), mid-term (6–10 years), and long-term (more than 10 years) residency in Canada. Our findings revealed several significant factors of sense of place, including self-perceived mental wellness, income, age, employment, citizenship status, marital status, dwelling type, and length of residency in Canada. The findings highlight the need for research to incorporate sense of place into studies on visible minority immigrants and to focus on those factors contributing to place attachment amongst recent immigrants.     

Racist housing practices as a precursor to uneven neighborhood change in a post-industrial city

Racial dynamics and discrimination have been extremely important in influencing decline in the American Rust Belt. The mid-twentieth century departure of white and middle-class populations from cities was precipitated by a breakdown of discriminatory housing practices. This study examines the relationship among housing condition, vacancies, poverty, and demographics in Flint, Michigan, from 1950 to 2010. Historical census data from the National Historical GIS and housing condition data from the City of Flint government are aggregated to neighborhoods defined by economic condition factor (n = 102). Results of rank-difference correlation and geographically weighted regression indicate that, across neighborhoods with the greatest decline in housing condition, the strongest correlate was most often the increase in vacancy rates driven initially by racially motivated suburbanization – suggesting that demographic change alone is not primarily responsible for neighborhood decline. This research is important to understanding the long-term and ongoing consequences of mid-twentieth century racist housing practices, particularly as it relates to the implications of maintaining legacy infrastructure.     

Explaining Ethnic Residential Preferences—The Case of Somalis and Russians in the Helsinki Metropolitan Area

This paper contributes to the discussion on ethnic segregation processes by examining the ethnic residential preferences of two immigrant groups in the Helsinki Metropolitan Area (HMA): Somalis and Russians. The relatively recent increase in ethnic diversity and the active policies aiming for social and ethnic mixing provide an interesting environment for studying the subject in the HMA. Ethnic residential preferences have traditionally been viewed in strong connection with the immigrant's relations to his or her own ethnic community. The case of Somalis and Russians in the HMA indicates that in the ethnically mixed setting, minority–majority relations have a significant role in the formation of ethnic residential preferences. The paper is based on in-depth interviews with the Somali (n = 24) and Russian (n = 26) immigrants, social workers and housing authority personnel (n = 18).     

“It’s Just a Matter of Adjustment”: Residents’ Perceptions and the Potential for Low-impact Home Practices

In addition to material, spatial and thermal standards and norms that influence the resource intensity of home environments, a key indicator of the environmental impact related to housing is found in residents’ ways of life. Of interest to the study presented in this paper is how residents’ perceptions of home and living standards relate to opinions on environmental issues and the reduction of resource use, exploring the potential and willingness to engage in low-impact ways of living. Empirical material from a questionnaire (n = 156) and interview study (n = 22) with residents in a tenant-owned housing association in Sweden provides insights into conventions and perceptions surrounding practices primarily linked to voluntary simplicity, living smaller as well as sharing spaces and resources. The study emphasizes the need for understanding residents’ perspectives and the implications this might have for targeting the resource intensity of homes in future development and policy.     

A comparative assessment of local municipal food policy integration in the Netherlands

ABSTRACT

Local governments around the world increasingly engage in food governance, aiming to address food system challenges such as obesity, food waste, or food insecurity. However, the extent to which municipalities have actually integrated food across their policies remains unknown. This study addresses this question by conducting a medium-n systematic content analysis of local food policy outputs of 31 Dutch municipalities. Policy outputs were coded for the food goals and instruments adopted by local governments. Our analysis shows that most municipalities integrate food to a limited extent only, predominantly addressing health and local food production or consumption. Furthermore, municipalities seem hesitant to use coercive instruments and predominantly employ informative and organizational instruments. Nonetheless, a small number of municipalities have developed more holistic approaches to address food challenges. These cities may prove to be a leading group in the development of system-based approaches in Dutch local food policy.     

Understanding cities through city brands: City branding as a social and semantic network

More and more towns, cities, regions, and countries are investing in branding campaigns in order to establish a reputation for themselves, and to have a competitive edge in today’s global market. In their essence, branding campaigns are places’ attempts to define themselves to target audiences. However, the literature and practice of place branding have focused on the competition of brands at the expense of exploring the relations between people, symbols, meanings, and physical characteristics of cities. Therefore, current branding measurement scales and indices used to understand the defining characteristics of places are problematic. This article first analyzes three of the prominent place branding indices: Anholt-GfK Roper City Brands Index, FutureBrand Country Brand Index, and East–West Nation Brand Perception Index. Subsequently, it proposes an analytical framework combining two network analysis methods – social and semantic – to evaluate place brands, called “Define–Measure–Visualize” (DMV). In order to argue for the feasibility of the proposed method, a sample dataset is created based on tweets about Boston and New York City. By introducing a consumer-centric and communications-based approach and exploring the connection between cities, people, and messages, the findings of this research can be used in understanding cities/places, measuring the success of branding campaigns, and managing future campaigns.     

Discussion on “Empirical methods for determining shaft bearing capacity of semi-deep foundations socketed in rocks”[J Rock Mech Geotech Eng 6(2017)1140-151]

A new comprehensive set of data(n = 178) is compiled by adding a data set(n = 72) collected by Arioglu et al.(2007) to the data set(n = 106) presented in Rezazadeh and Eslami(2017). Then, the compiled data set is evaluated regardless of the variation in lithology/strength. The proposed empirical equation in this study comprises a wider range of uniaxial compressive strength(UCS)(0.15 MPa σ_(rc) 156 MPa) and various rock types. Rock mass cuttability index(RMCI) is correlated with shaft resistance(r_s) to predict the shaft resistance of rock-socketed piles. The prediction capacity of the RMCI versus r_s equation is also found to be in a fair good agreement with the presented data in Rezazadeh and Eslami(2017). Since the RMCI is a promising parameter in the prediction of shaft resistance, the researchers in the rock-socketed pile design area should consider this parameter in the further investigations.     

‘They took the land,now we’re fighting for a house’: Aboriginal perspectives about urban housing disadvantage

Aboriginal Australians experience substantial housing disadvantage on a range of measures, yet relatively little is known about how urban Aboriginal people perceive their housing circumstances. While most Aboriginal people live in urban or suburban areas, research and policy attention has tended to focus on remote housing issues. This paper draws on focus groups conducted with Aboriginal people at an Aboriginal Medical Service in Western Sydney (n = 38) about their housing experiences and beliefs about why many Aboriginal people experience the housing disadvantage they described. Participants described a landscape in which their housing experiences were materially affected by their Aboriginality and inextricably linked to racial discrimination, poverty, marginalization, the lack of social and affordable housing and disempowerment, all with negative implications for their psychosocial well-being. Participant views aligned with critical race theory, with race described as a fundamental structural force that created and deepened housing disadvantage beyond economic hardship alone.     

Cytotoxic assessment of flying barb fish (Esomus metallicus) from a gold mine area with heavy metal contamination

This study aimed to investigate contamination by heavy metals including arsenic (As), cadmium (Cd), chromium (Cr), lead (Pb), and manganese (Mn) and to conduct a cytotoxic assessment of Esomus metallicus from a gold mine area compared with that from the non-affected area. The E. metallicus samples were collected downstream of a gold mine area. The heavy metal concentrations were analysed by inductively coupled plasma optical emission spectroscopy (ICP-OES). The average amounts of As, Cd, Cr, Pb and Mn in water and E. metallicus samples from the gold mine area were 0.368 ± 0.009, 0.008 ± 0.006, 0.009 ± 0.001, 0.006 ± 0.002, 1.438 ± 0.058 mg/L, 0.65 ± 0.25, 0.03 ± 0.03, 2.12 ± 0.05, 0.25 ± 0.07 and 18.28 ± 6.82 mg/kg, respectively. The difference of As, Cr and Mn concentrations in E. metallicus samples between gold mine and non-affected areas was statistically significant (p < 0.05) except for Cd and Pb. The diploid chromosome number of E. metallicus from both areas was 2n = 50. There are six types of chromosomal aberrations including centric fragmentation (CF), centric gap (CG), single chromatid gap (SCG), fragmentation (F), deletion (D) and polyploidy (P). The most common chromosomal aberration type in the samples from the gold mine area was CG, and the difference in chromosomal aberration and the number of cells with chromosomal aberrations in E. metallicus between the study areas was statistically significant (p < 0.05). The percentages of chromosomal aberrations in the E. metallicus samples from gold mine and non-affected areas were 14.66 and 3.00, respectively.     

Reframing place promotion,place marketing,and place branding - moving beyond conceptual confusion

The literature and practice of place promotion, place marketing and place branding lack a common understanding of what these three concepts mean and through what kind of policies they can be implemented. Although scholars have provided several theoretical frameworks and definitions, both scholars and practitioners (advisors, civil servants, public and private stakeholders, and politicians) often use them synonymously. This paper argues that recent developments in both theory and practice – with respect to place promotion, place marketing and place branding – provide an opportunity to address this conceptual confusion. In the academic debate, a common understanding is slowly emerging and in practice, a more integral approach is gaining ground. To contribute to these advances, we present the outline of a framework to help distinguish between place promotion, place marketing and place branding, along with a discussion on why we believe these differences (should) matter to practitioners.     

The breakdown of the municipality as caring platform: lessons for co-design and co-learning in the age of platform capitalism

ABSTRACT

If municipalities were the caring platforms of the 19-20th century sharing economy, how does care manifest in civic structures of the current period? We consider how platforms – from the local initiatives of communities transforming neighbourhoods, to the city, in the form of the local authority – are involved, trusted and/or relied on the design of shared services and amenities for the public good. We use contrasting cases of interaction between local government and civil society organisations in Sweden and the UK to explore trends in public service provision. We look at how care can manifest between state and citizens and at the roles that co-design and co-learning play in developing contextually sensitive opportunities for caring platforms. In this way, we seek to learn from platforms in transition about the importance of co-learning in political and structural contexts and make recommendations for the co-design of (digital) platforms to care with and for civil society.     

Community perceptions of orangutan conservation and palm oil in Melbourne,Australia

This study examined Greater Melbourne residents’ perspectives toward orangutan conservation through a mixed mode survey method, using postal surveys (N = 108, response rate = 11.8%) and telephone interviews (N = 50, response rate = 51%). Differences were found between knowledge levels about orangutans, attitudes towards orangutans and behavioural intentions. It appears probable that when an individual is educated about how human beings impact orangutans and holds positive attitudes towards them, most would try to reduce their impact.     

Dégradation des eaux de rejets issues d’une raffinerie d’huile de coton par plasma d’arc électrique rampant à pression atmosphérique

Wastewater samples from liquid effluents of cotton oil refinery in Far-Northern Cameroon were exposed to a gliding arc discharge for various exposure times in a cold plasma reactor. The analysed results showed high levels of organic pollution parameters (TOC = 4635 mg/L, COD = 6943, 98 mg/L) before treatment. More than 56% TOC and 75% COD abatement were obtained after 30 min treatment in batch conditions with a laboratory reactor. The resultant pollution abatement is attributed both to strong oxidizing effects of °OH and NO° radicals formed in the plasma and their derivatives (H₂O₂, ONO₂H and NO₃H). The conductivity and TDS increase linearly and the pH, TOC and COD decrease with increasing exposure time to the discharge. The oxidation obeys a pseudo first-order kinetics law (kinetic rate: k_1DCO = 0, 0381 min^?1 and k_1COT = 0, 0245 min^?1).     

Up-“Routing” Communities: Subaltern Voices Challenge Sustainable Urban Renewal in Fortaleza,Brazil

Passed in 2001, Brazil’s Estatuto da Cidade (City Statute) requires municipalities to recognize the social value of space in addition to its economic value and has been hailed as a major protection for residents of informal settlements. As Brazil was thrust onto a global stage as host to the World Cup of Soccer and 2016 Summer Olympics, how are local government city officials balancing economic and social use amidst major urban renewal processes? Drawing upon voices of informal settlement residents in Fortaleza, Brazil, we examine the impact of transportation infrastructure upgrades on informal settlements. We find that despite the right to the city espoused in the Estatuto da Cidade, residents in informal settlements continue to be socially and physically marginalized. We examine why social use protections are not halting the displacement of informal settlements and discuss emerging landscapes of local activism resulting from this contradiction.     

Vacant residential buildings as potential reserves: a geographical and statistical study

Vacant housing has been associated with a variety of interests from economic implications and consequences for the urban structure to the possibility of providing housing for the homeless. In addition to these social and financial aspects, unused buildings have resources embedded in them. They take land from other activities and contain refined natural resources in the form of building components and materials. Therefore, empty buildings can be regarded as reserves for housing and repositories for urban mining, i.e. material extraction. In doing so, these buildings contribute to the resilience of cities. This geographical and statistical study on residential vacancies is situated in Finland, where empty homes may also keep using energy and producing emissions. The research material consists of a vast dataset of all residential buildings with vacancies in Finland in mid-2014, a total of 275 486 buildings with 1 100 267 occupied and 378 802 unoccupied dwellings (52% of the Finnish housing stock). The paper shows several characteristics that increase the understanding of vacancies and their role in the dynamics of the building stock. Public policy should address the issue of vacancy, not only because of social and economic implications but also because of its environmental impacts and opportunities.     

Local Response to the Global Challenge: Comparing Local Economic Development Policies in a Regional Context

This article reports on a study that examined and compared the responses of six Greater Toronto Area (GTA) municipalities (two central, four suburban) to the challenges of global economic change. The study was carried out in a context characterized by the transfer to municipal governments of both administrative and financial responsibilities for local services by the government of the Province of Ontario. It found a strong tendency for the municipalities to compete with each other for economic advantage, despite efforts to convince them of the need for a cooperative region‐wide approach. Suburban governments relied principally on strategies to draw businesses away from the core, and this type of activity seemed likely to increase because of the municipalities' increased dependence on local property taxes. Nonetheless, study findings suggested several ways in which regional organizations or senior governments might help to strengthen regional economies without expecting municipal governments to surrender control over economic development policy.     

Territoriality and safety in urban residential neighborhoods in Nigeria

The paper compares types and distribution of crime in residential areas with fences and street barricades to areas without and assesses the implications on the neighborhood safety and crime control. It explores the residents’ perception of crime and safety before and after the introduction of physical barriers. The results show that similar crimes occur in both areas, with the highest incidences recorded in the higher and medium-income areas. Location did not significantly influence crime incidence, location and street barricades together produced a significant influence on crime incidences (F = 17.853; Sig.?=?.00). Fences and street barricades have slight effect on crime incidences (R = .418; R² = .175). Retreating behind the walls provides opportunity for street crimes. Despite recording high incidences of crime, residents’ perception of safety improved after the introduction of street gates and barricades. The study concludes that alternatives to gates, fences, and street barricades are imperative.     

A Sketchbook for the City to Come: The Pop-Up as R&D

Dan Hill , an Executive Director at Future Cities Catapult, is not content to accept that architecture is willy-nilly the carapace for the desires of the society that constructs it. He argues that pop-ups – all too often the tools of corporate branding or the cat's paw of gentrification – should be used to implement overt social initiatives, presaging an architecture of positive change in cities. A member of the Finnish Innovation Fund Sitra's Strategic Design Unit from 2011 to 2012, he helped lead the Open Kitchen initiative featured here.