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Sökning: WFRF:(Persson Anders) > Engelska > Annan publikation

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  • Bryngelsson, David, 1981, et al. (författare)
  • The effect of food-price movements on African households - An investigation of food production and consumption patterns in four African countries
  • 2009
  • Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
    • The recent spike in world food prices has intensified the debate regarding the impact of food prices on poverty. In this paper we aim to assess households’ vulnerability to food-price increases in four countries in Sub-Saharan Africa. Using household data from the World Bank’s Living Standard Measurement Surveys in Ghana (2005–2006), Kagera region, Tanzania (2004), Malawi (2004–2005) and South Africa (1993) we analyze food production and consumption patterns in rural and urban populations. We use two established indicators of sensitivity to food price changes—one measuring the share of income spent on food, the other measuring net sales of food compared to total expenditures. We find that the shares of the populations spending more than half of their income on food ranges from 62–81% in rural areas and from 26–67% in urban areas. Further we find that in all regions studied, most households (74–99%) in rural areas are net buyers of food and stand to lose in the short term from higher food prices. As expected, for urban households this is true to an even higher extent. In contrast to earlier studies we look at all food items and not just one or a few staple foods, giving a better understanding of vulnerability to general food price changes. We find that the exclusion of non-staple foods has a significant impact on theresults.
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  • Hsu, Chih-Wei, et al. (författare)
  • Controlled Growth of GaN Pyramidal template hosting InGaN Quantum Dots
  • Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
    • The emission properties of InGaN grown on hexagonal GaN pyramids with various pitch distances (PD) are studied. Emissions associated with InGaN quantum wells (QWs) and InGaN quantum dots (QDs) can be identified. The emission energies of InGaN QWs and QDs shift toward opposite directions with increasing PD; red-shift for QWs and blue-shift for QDs. Based on the source supply mechanism in a selective area growth process, the formation of InGaN QDs on GaN pyramids is believed to be a combined effect of Stranski-Krastanow growth mode and spinodal decomposition taking place at the microscopic (0001) surfaces on GaN pyramids.
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Persson, Anders (9)
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