| 1. |
- Ademuyiwa, Adesoji O., et al.
(författare)
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Determinants of morbidity and mortality following emergency abdominal surgery in children in low-income and middle-income countries
- 2016
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Ingår i: BMJ Global Health. - : BMJ Publishing Group Ltd. - 2059-7908. ; 1:4
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Tidskriftsartikel (refereegranskat)abstract
- Background: Child health is a key priority on the global health agenda, yet the provision of essential and emergency surgery in children is patchy in resource-poor regions. This study was aimed to determine the mortality risk for emergency abdominal paediatric surgery in low-income countries globally.Methods: Multicentre, international, prospective, cohort study. Self-selected surgical units performing emergency abdominal surgery submitted prespecified data for consecutive children aged <16 years during a 2-week period between July and December 2014. The United Nation's Human Development Index (HDI) was used to stratify countries. The main outcome measure was 30-day postoperative mortality, analysed by multilevel logistic regression.Results: This study included 1409 patients from 253 centres in 43 countries; 282 children were under 2 years of age. Among them, 265 (18.8%) were from low-HDI, 450 (31.9%) from middle-HDI and 694 (49.3%) from high-HDI countries. The most common operations performed were appendectomy, small bowel resection, pyloromyotomy and correction of intussusception. After adjustment for patient and hospital risk factors, child mortality at 30 days was significantly higher in low-HDI (adjusted OR 7.14 (95% CI 2.52 to 20.23), p<0.001) and middle-HDI (4.42 (1.44 to 13.56), p=0.009) countries compared with high-HDI countries, translating to 40 excess deaths per 1000 procedures performed.Conclusions: Adjusted mortality in children following emergency abdominal surgery may be as high as 7 times greater in low-HDI and middle-HDI countries compared with high-HDI countries. Effective provision of emergency essential surgery should be a key priority for global child health agendas.
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| 2. |
- Murari, A., et al.
(författare)
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A control oriented strategy of disruption prediction to avoid the configuration collapse of tokamak reactors
- 2024
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Ingår i: Nature Communications. - 2041-1723 .- 2041-1723. ; 15:1
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Tidskriftsartikel (refereegranskat)abstract
- The objective of thermonuclear fusion consists of producing electricity from the coalescence of light nuclei in high temperature plasmas. The most promising route to fusion envisages the confinement of such plasmas with magnetic fields, whose most studied configuration is the tokamak. Disruptions are catastrophic collapses affecting all tokamak devices and one of the main potential showstoppers on the route to a commercial reactor. In this work we report how, deploying innovative analysis methods on thousands of JET experiments covering the isotopic compositions from hydrogen to full tritium and including the major D-T campaign, the nature of the various forms of collapse is investigated in all phases of the discharges. An original approach to proximity detection has been developed, which allows determining both the probability of and the time interval remaining before an incoming disruption, with adaptive, from scratch, real time compatible techniques. The results indicate that physics based prediction and control tools can be developed, to deploy realistic strategies of disruption avoidance and prevention, meeting the requirements of the next generation of devices.
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| 3. |
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| 4. |
- Andersson, Magnus, et al.
(författare)
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Assessing Recovery from the 2004 Indian Ocean Tsunami : An Application of Night-time Light Data and Vegetation Index
- 2015
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Ingår i: Geographical Research. - : John Wiley & Sons. - 1745-5863 .- 1745-5871. ; 53:4, s. 436-450
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Tidskriftsartikel (refereegranskat)abstract
- It has been 10 years since the Indian Ocean Tsunami caused serious damage to the coastal areas in South and Southeast Asia. The effects on vegetation and human settlements in the affected areas were enormous. This study presents the results of an analysis estimating the long-term recovery using two longitudinal remotely sensed dataset: 1. Moderate Resolution Imaging Spectroradiometer enhanced vegetation index (MODIS EVI), a dataset accounting for change in the landscape and vegetation; and 2. Defense Meteorological Satellite Program-Optical Line Scanner (DMSP-OLS) night-time light data in order to estimate the effects on human and economic activities. It is evident from the results of this study that the night-time light and vegetation index datasets can both be beneficial in identifying changes caused by natural disasters and can be used to track recovery. The results using night-time light indicates a large loss of lighted area but also a rapid recovery of night-time light after the tsunami. Already in year 2005–2006, the levels of lighted area and sum of the lighting (SOL) intensity reached the same levels as pre-tsunami. For MODIS vegetation index, a drop can be observed in 2005/2006 on locations close to the coastline using 1 year temporal resolution; however, when utilizing the 16 day temporal resolution, the impact of the tsunami is illustrated as a dramatic drop, mostly in pixels located within 3km from the coast. Following the drop in vegetation index due to the tsunami, it was observed that most pixels exhibited at least some level of recovery in 2 years after the event.
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| 5. |
- Andersson, Magnus, et al.
(författare)
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Does Large-Scale Gold Mining Reduce Agricultural Growth? Case studies from Burkina Faso, Ghana, Mali and Tanzania
- 2015
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Ingår i: Annual World Bank Conference on Land and Poverty 2015 : Linking Land Tenure and Use for Shared Prosperity - Linking Land Tenure and Use for Shared Prosperity. - : The World Bank. ; , s. 1-27
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Konferensbidrag (refereegranskat)abstract
- We apply a novel analytical framework based on medium resolution satellite data for the period 2001 – 2012 to estimate the effects of gold mining on agricultural production in Ghana, Mali, Tanzania and Burkina Faso. Our analysis finds a strong correlation between official statistics of agricultural production and vegetation index from satellite data at district level in these countries. Agricultural productivity as proxied by greenness index (NDVI) does not decrease in the proximity of large scale gold mines. Our empirical estimations show that economic activity as proxied by night lights, increase in the proximity of mining but the estimates remains statistically insignificant.
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| 6. |
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| 7. |
- Andersson, Magnus, et al.
(författare)
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Mining, Economic Activity and Remote Sensing : Case studies from Burkina Faso, Ghana, Mali and Tanzania
- 2015
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Konferensbidrag (refereegranskat)abstract
- We apply a novel analytical framework based on medium resolution satellite data for the period 2001 – 2012 to estimate the effects of gold mining on agricultural production in Ghana, Mali, Tanzania and Burkina Faso. Our analysis finds a strong correlation between official statistics of agricultural production and vegetation index from satellite data at district level in these countries. Agricultural productivity as proxied by greenness index (NDVI) does not decrease in the proximity of large scale gold mines. Our empirical estimations show that economic activity as proxied by night lights, increase in the proximity of mining but the estimates remains statistically insignificant.
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| 8. |
- Andersson, Magnus, et al.
(författare)
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Mining, Economic Activity and Remote Sensing : Case studies from Burkina Faso, Ghana, Mali and Tanzania
- 2015
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Ingår i: CSAE Conference 2015: Economic Development in Africa. ; , s. 1-42
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Konferensbidrag (refereegranskat)abstract
- Mining is a major economic activity in many developing countries particularly in Africa. Mining operations, whether small- or large-scale, have an impact on local communities. Previous research focus on how the gold mining sector in Africa is dependent on policy reforms in order to enable countries to better benefit from the sector, changing environmental conditions or the structure of the economic activities in the areas surrounding mines. Here, we apply a novel analytical framework based on medium resolution satellite data for the period 2001 – 2012 to estimate the economic effects of mining in Ghana, Mali, Burkina Faso and Tanzania. Through the analysis of nighttime lights, agricultural vegetation dynamics and forest change, we find a positive effect on average economic growth for most mining districts in Mali, Burkina Faso and Tanzania. Moreover, our analysis establishes strong relationship between statistics of agricultural production and vegetation index from satellite data on district level in Mali, Ghana and Tanzania.
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| 9. |
- Archila Bustos, Maria Francisca, et al.
(författare)
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A pixel level evaluation of five multitemporal global gridded population datasets : a case study in Sweden, 1990-2015
- 2020
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Ingår i: Population and environment. - : Springer Science and Business Media LLC. - 0199-0039 .- 1573-7810. ; 42, s. 255-277
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Forskningsöversikt (refereegranskat)abstract
- Human activity is a major driver of change and has contributed to many of the challenges we face today. Detailed information about human population distribution is fundamental and use of freely available, high-resolution, gridded datasets on global population as a source of such information is increasing. However, there is little research to guide users in dataset choice. This study evaluates five of the most commonly used global gridded population datasets against a high-resolution Swedish population dataset on a pixel level. We show that datasets which employ more complex modeling techniques exhibit lower errors overall but no one dataset performs best under all situations. Furthermore, differences exist in how unpopulated areas are identified and changes in algorithms over time affect accuracy. Our results provide guidance in navigating the differences between the most commonly used gridded population datasets and will help researchers and policy makers identify the most suitable datasets under varying conditions.
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| 10. |
- Archila, Maria, et al.
(författare)
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Nighttime lights and population changes in Europe 1992–2012
- 2015
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Ingår i: Ambio. - : Springer. - 0044-7447 .- 1654-7209. ; 44, s. 653-665
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Tidskriftsartikel (refereegranskat)abstract
- Nighttime satellite photographs of Earth reveal the location of lighting and provide a unique view of the extent of human settlement. Nighttime lights have been shown to correlate with economic development and population but little research has been done on the link between nighttime lights and population change over time. We explore whether population decline is coupled with decline in lighted area and how the age structure of the population and GDP are reflected in nighttime lights. We examine Europe between the period of 1992 and 2012 using a Geographic Information System and regression analysis. The results suggest that population decline is not coupled with decline in lighted area. Instead, human settlement extent is more closely related to the age structure of the population and to GDP. We conclude that declining populations will not necessarily lead to reductions in the extent of land development.
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