Modelling of natural convection flows with large temperature differences : a benchmark problem for low Mach number solvers. Part 1, Reference solutions

There are very few reference solutions in the literature on non-Boussinesq natural convection flows. We propose here a test case problem which extends the well-known De Vahl Davis differentially heated square cavity problem to the case of large temperature differences for which the Boussinesq approximation is no longer valid. The paper is split in two parts: in this first part, we propose as yet unpublished reference solutions for cases characterized by a non-dimensional temperature difference of 0.6, (constant property and variable property cases) and (variable property case). These reference solutions were produced after a first international workshop organized by CEA and LIMSI in January 2000, in which the above authors volunteered to produce accurate numerical solutions from which the present reference solutions could be established

Relationship between objective measures of physical activity and weather: a longitudinal study

BACKGROUND: The weather may be a barrier to physical activity but objective assessment of this hypothesis is lacking. Therefore we evaluated the effect of temperature, rain or snow, and wind speed on the daily physical activity of adults. METHODS: This report contains data from 25 males (BMI (mean ± SD): 28.7 ± 3.83 kg/m(2)) and 177 females (BMI: 29.2 ± 5.92 kg/m(2)) enrolled in an intervention to increase physical activity. Steps/day of the participants was measured by pedometer. Weather data were obtained from Environment Canada. A total of 8,125 observations were included in a mixed linear model analysis. RESULTS: Significant weather related variables (at the 5% level) impacting steps/day included: seasonal effects related to the interaction between weekday and month; mean temperature, total rainfall, interactions between gender, BMI and total snow, interactions between maximum wind speed and BMI, and the amount of snow on the ground. The estimated magnitudes for the various effects were modest, ranging from ~1% to ~20%. Thus for an average individual taking ~10,000 steps/day, weather-dependent changes in physical activity could reach 2,000 steps/day. CONCLUSION: We conclude that weather had modest effects on physical activity of participants in an intervention to increase their activity. It should be stressed that these effects may be different for less or more motivated people. With this in mind, we suggest that the effect of weather on physical activity in the general population needs to be objectively assessed to better understand the barrier it poses, especially as it relates to outdoor recreation or work activities

Family strategies and dilemmas for low-income rural-urban labour migrants

This policy brief summarises the findings of a qualitative study into the family relations of labour migrants across their peak child-bearing years. It evidences how wives/mothers and husbands/fathers manage their relations with spouse and children when they have to ‘go away’ for work. These strategies and dilemmas have implications for the impact of migration on the wellbeing both now and over the longer term for Vietnam

Gender norms and agricultural innovation: Insights from six villages in Bangladesh

The ability of development interventions to catalyse and support innovation for—and by— women and men is undermined by lack of specific understanding about how gender norms interact with gender relations and what this means for innovation. This is also the case for Bangladesh despite substantive research and development investments in the past decade that have placed emphasis on gender norms, particularly those inhibiting women and girl’s education, women and girl’s health, and women’s economic empowerment. This paper analyses how men and women in South West Bangladesh perceive gender norms to affect their ability to innovate, adopt, and benefit from new technologies in aquaculture, fisheries and agricultural systems. Our qualitative findings from six villages in 2014 confirm that the engagement of women and men smallholders with agricultural innovation and its opportunities is gender-differentiated. We explore further: how gender norms shape these differences; which gender norms are most significant in the given context, when and for whom; and, finally, when and how are some women and men able to innovate in the context of these norms. In doing so, we highlight how gender norms interact with gender relations and wider structural inequalities to constrain and/or enable innovation for different women and men. We conclude that technical organizations seeking to promote innovation need to go beyond itemizing gender ‘gaps’ to engage more closely with underlying gender norms and the way they influence various women’s, and men’s, motivations, spheres of innovation, and valuations of outcomes

Rural modernization and the remaking of the rural citizen in China:Village redevelopment, migration and precarity

The Chinese government's ambitious plans to modernize the countryside have significant impacts for rural populations. Upgrading or relocating villages is one component of this vision with profound implications for rural citizens. We use multiple social science research methods to investigate ongoing rural transformation in two villages designated for Village Redesign in Anhui Province, China. We show that the Village Redesign process is negatively impacting on the migration–development nexus and the resultant limbo deepens the precarity of high-mobility, translocal households who already experience secondary forms of citizenship and limited social protections. This study raises further questions about the ongoing transformation of rural China and questions the modernizing rural agenda of the Chinese state

Microfinance and small business development in a transitional economy: Insights from borrowers’ relations with microfinance organisations in Kazakhstan

Microfinance is seen as an important vehicle for developing small businesses in developing and transitional economies despite the relative absence of supporting research. We use mixed methods to offer a nuanced empirical exploration of the relationship between microfinance and everyday entrepreneurial practice(s) in Kazakhstan. As in many transitional contexts, ‘unbankable’ borrowers here operate in a vibrant informal sector, face high degrees of uncertainty, and retain a strong distrust of a corrupt/predatory state. Our data-based methodology for analysing borrowers’ diverse relationships with microfinance organisations (MFOs) generates insights into their multiple pathways to business development. Both ‘outreach’ and ‘commercialised’ MFOs sustain micro-flows of resources that are critical for everyday entrepreneurs who need to finance ongoing consumption and contingencies whilst also (and by) building up their small businesses. Microfinance use did not promote formalisation or impersonalised banking relationships. Instead, MFOs focused primarily on repayment, clients’ businesses remained partially formalised or unregistered across all stages of growth and the lending relationships preferred by Private MFOs and borrowers were highly personalised. Consequently, we call for assumptions about how microfinance can (and should) drive small business development need to be rethought for transitional contexts