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  • image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Authors: Ball, Jacques; Chesny, P.; Combet, M.; Fontaine, J.M.; +21 Authors

    We present a total of 191 and 203 data points of the elastic neutron-protonspin correlation parameters Aookk and Aoosk , respectively. Both observables were measured in a large angular interval. The observable Aookk was measured from 0.312 to 1.10 GeV and Aoosk from 0.80 to 1.10 GeV. The SATURNE II polarized beam of free neutrons obtained from the break-up of polarized deuterons was scattered on the polarized Saclay frozen-spin proton target. The beam polarization was oriented either along the beam direction or sideways, the target polarization was oriented longitudinally. Data are compared with phase-shift analyses predictions and with the PSI, LAMPF and SATURNE II results. Present results provide an important contribution to any future theoretical or phenomenological analysis.

    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Archive ouverte UNIG...arrow_drop_down
    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
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      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Archive ouverte UNIG...arrow_drop_down
      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
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  • image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Authors: Ball, Jacques; Chesny, P.; Combet, M.; Fontaine, J.M.; +21 Authors

    We present a total of 191 and 203 data points of the elastic neutron-protonspin correlation parameters Aookk and Aoosk , respectively. Both observables were measured in a large angular interval. The observable Aookk was measured from 0.312 to 1.10 GeV and Aoosk from 0.80 to 1.10 GeV. The SATURNE II polarized beam of free neutrons obtained from the break-up of polarized deuterons was scattered on the polarized Saclay frozen-spin proton target. The beam polarization was oriented either along the beam direction or sideways, the target polarization was oriented longitudinally. Data are compared with phase-shift analyses predictions and with the PSI, LAMPF and SATURNE II results. Present results provide an important contribution to any future theoretical or phenomenological analysis.

    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Archive ouverte UNIG...arrow_drop_down
    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
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      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Archive ouverte UNIG...arrow_drop_down
      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Dalton, C.; O Dwyer, B.; Taylor, D.; DeEyto, E.; +5 Authors

    Oligotrophic catchments with short spatey streams, upland lakes and peaty soils characterise northwest European Atlantic coastal regions. These catchments are important biodiversity refuges, particularly for sensitive diadromous fish populations but are subject to changes in land use and land management practices associated with afforestation, agriculture and rural development. Quantification of the degree of catchment degradation resulting from such anthropogenic impacts is often limited by a lack of long-term baseline data in what are generally relatively isolated, poorly studied catchments. This research uses a combination of palaeolimnological (radiometrically-dated variations in sedimentary geochemical elements, pollen, diatoms and remains of cladocera), census, and instrumental data, along with hindcast estimates to quantify environmental changes and their aquatic impacts since the late 19th century. The most likely drivers of any change are also identified. Results confirm an aquatic biotic response (phyto- and zooplankton) to soil erosion and nutrient enrichment associated with the onset of commercial conifer afforestation, effects that were subsequently enhanced as a result of increased overgrazing in the catchment and, possibly, climate warming. The implications for the health of aquatic resources in the catchment are discussed Environmental Protection Agency in Ireland (ILLUMINATE 2005-W-MS-40, P.McGinnity was supported by the Beaufort Marine Research Award in Fish Population Genetics funded by the Irish Government under the Sea Change Programme.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Marine Institute Ope...arrow_drop_down
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Marine Institute Ope...arrow_drop_down
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Dalton, C.; O Dwyer, B.; Taylor, D.; DeEyto, E.; +5 Authors

    Oligotrophic catchments with short spatey streams, upland lakes and peaty soils characterise northwest European Atlantic coastal regions. These catchments are important biodiversity refuges, particularly for sensitive diadromous fish populations but are subject to changes in land use and land management practices associated with afforestation, agriculture and rural development. Quantification of the degree of catchment degradation resulting from such anthropogenic impacts is often limited by a lack of long-term baseline data in what are generally relatively isolated, poorly studied catchments. This research uses a combination of palaeolimnological (radiometrically-dated variations in sedimentary geochemical elements, pollen, diatoms and remains of cladocera), census, and instrumental data, along with hindcast estimates to quantify environmental changes and their aquatic impacts since the late 19th century. The most likely drivers of any change are also identified. Results confirm an aquatic biotic response (phyto- and zooplankton) to soil erosion and nutrient enrichment associated with the onset of commercial conifer afforestation, effects that were subsequently enhanced as a result of increased overgrazing in the catchment and, possibly, climate warming. The implications for the health of aquatic resources in the catchment are discussed Environmental Protection Agency in Ireland (ILLUMINATE 2005-W-MS-40, P.McGinnity was supported by the Beaufort Marine Research Award in Fish Population Genetics funded by the Irish Government under the Sea Change Programme.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Marine Institute Ope...arrow_drop_down
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Marine Institute Ope...arrow_drop_down
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: University, Dublin City; Smartbay;

    The SmartBay NIAP fund was made available in 2012 through Dublin City University over a two year period to enable researchers to access the SmartBay Ireland National Test and Demonstration Facility in Galway Bay. Research proposals were invited for funding under a number of activity types that are in line with the objectives of the SmartBay PRTLI Cycle 5 programme. This fund provided small awards (typically €2-25K) to research teams through a national competitive process, which was open to all higher education institutions on the island of Ireland. There were both open and biannual calls. The SmartBay NIAP fund was established to enable researchers in academia and industry to access the SmartBay Ireland national test and demonstration infrastructure. Proposals to access the infrastructure were brief and required information on the researcher(s), a description of the proposed research and its potential impact to the research team arising from the access to SmartBay Ireland. Marine Institute

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Marine Institute Ope...arrow_drop_down
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Marine Institute Ope...arrow_drop_down
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: University, Dublin City; Smartbay;

    The SmartBay NIAP fund was made available in 2012 through Dublin City University over a two year period to enable researchers to access the SmartBay Ireland National Test and Demonstration Facility in Galway Bay. Research proposals were invited for funding under a number of activity types that are in line with the objectives of the SmartBay PRTLI Cycle 5 programme. This fund provided small awards (typically €2-25K) to research teams through a national competitive process, which was open to all higher education institutions on the island of Ireland. There were both open and biannual calls. The SmartBay NIAP fund was established to enable researchers in academia and industry to access the SmartBay Ireland national test and demonstration infrastructure. Proposals to access the infrastructure were brief and required information on the researcher(s), a description of the proposed research and its potential impact to the research team arising from the access to SmartBay Ireland. Marine Institute

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Marine Institute Ope...arrow_drop_down
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Marine Institute Ope...arrow_drop_down
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Mb Théodore Munyuli; J-M Mbaka Kavuvu; Guy Mulinganya; G Mulinganya Bwinja;

    Cholera epidemics have a recorded history in eastern Congo dating to 1971. A study was conducted to find out the linkage between climate variability/change and cholera outbreak and to assess the related economic cost in the management of cholera in Congo.This study integrates historical data (20 years) on temperature and rainfall with the burden of disease from cholera in South-Kivu province, eastern Congo.Analyses of precipitation and temperatures characteristics in South-Kivu provinces showed that cholera epidemics are closely associated with climatic factors variability. Peaks in Cholera new cases were in synchrony with peaks in rainfalls. Cholera infection cases declined significantly (P<0.05) with the rise in the average temperature. The monthly number of new Cholera cases oscillated between 5 and 450. For every rise of the average temperature by 0.35 °C to 0.75 °C degree Celsius, and for every change in the rainfall variability by 10-19%, it is likely cholera infection risks will increase by 17 to 25%. The medical cost of treatment of Cholera case infection was found to be of US$50 to 250 per capita. The total costs of Cholera attributable to climate change were found to fall in the range of 4 to 8% of the per capita in annual income in Bukavu town.It is likely that high rainfall favor multiplication of the bacteria and contamination of water sources by the bacteria (Vibrio cholerae). The consumption of polluted water, promiscuity, population density and lack of hygiene are determinants favoring spread and infection of the bacteria among human beings living in over-crowded environments.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Iranian Journal of P...arrow_drop_down
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    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Iranian Journal of Public Health
    Article . 2013
    Data sources: DOAJ
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Iranian Journal of Public Health
    Article . 2013
    Data sources: DOAJ
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Iranian Journal of P...arrow_drop_down
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      Iranian Journal of Public Health
      Article . 2013
      Data sources: DOAJ
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      Iranian Journal of Public Health
      Article . 2013
      Data sources: DOAJ
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Mb Théodore Munyuli; J-M Mbaka Kavuvu; Guy Mulinganya; G Mulinganya Bwinja;

    Cholera epidemics have a recorded history in eastern Congo dating to 1971. A study was conducted to find out the linkage between climate variability/change and cholera outbreak and to assess the related economic cost in the management of cholera in Congo.This study integrates historical data (20 years) on temperature and rainfall with the burden of disease from cholera in South-Kivu province, eastern Congo.Analyses of precipitation and temperatures characteristics in South-Kivu provinces showed that cholera epidemics are closely associated with climatic factors variability. Peaks in Cholera new cases were in synchrony with peaks in rainfalls. Cholera infection cases declined significantly (P<0.05) with the rise in the average temperature. The monthly number of new Cholera cases oscillated between 5 and 450. For every rise of the average temperature by 0.35 °C to 0.75 °C degree Celsius, and for every change in the rainfall variability by 10-19%, it is likely cholera infection risks will increase by 17 to 25%. The medical cost of treatment of Cholera case infection was found to be of US$50 to 250 per capita. The total costs of Cholera attributable to climate change were found to fall in the range of 4 to 8% of the per capita in annual income in Bukavu town.It is likely that high rainfall favor multiplication of the bacteria and contamination of water sources by the bacteria (Vibrio cholerae). The consumption of polluted water, promiscuity, population density and lack of hygiene are determinants favoring spread and infection of the bacteria among human beings living in over-crowded environments.

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    Iranian Journal of Public Health
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    Authors: McCarthy, Colm; Scott, Sue;

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    Authors: McCarthy, Colm; Scott, Sue;

    non-peer-reviewed

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    EconStor
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      EconStor
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    Authors: Tilly, Nora; Hoffmeister, Dirk; Aasen, Helge; Brands, Jonas; +1 Authors

    Research in the field of precision agriculture is becoming increasingly important due to the growing world population whilst area for cultivation remains constant or declines. In this context, methods of monitoring in?season plant development with high resolution and accuracy are necessary. Studies show that terrestrial laser scanning (TLS) can be applied to capture small objects like crops. In this contribution, the results of multi-temporal field campaigns with the terrestrial laser scanner Riegl LMS-Z420i are shown. Four surveys were carried out in the growing period 2012 on a field experiment where various barley varieties were cultivated in small-scale plots. In order to measure the plant height above ground, the TLS-derived point clouds are interpolated to generate Crop Surface Models with a very high resolution of 1 cm. For all campaigns, a common reference surface, representing the Digital Elevation Model was used to monitor plant height in the investigated period. Manual plant height measurements were carried out to verify the results. The very high coefficients of determination (R² = 0.89) between both measurement methods show the applicability of the approach presented. Furthermore, destructive biomass sampling was performed to investigate the relation to plant height. Biomass is an important parameter for evaluating the actual crop status, but non-destructive methods of directly measuring crop biomass do not exist. Hence, other parameters like reflectance are considered. The focus of this study is on non-destructive measurements of plant height. The high coefficients of determination between plant height and fresh as well as dry biomass (R² = 0.80, R² = 0.77) support the usability of plant height as a predictor. The study presented here demonstrates the applicability of TLS in monitoring plant height development with a very high spatial resolution. Proceedings of the Workshop on UAV-based Remote Sensing Methods for Monitoring Vegetation Kölner geographische Arbeiten, 94 ISSN:0454-1294

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    Authors: Tilly, Nora; Hoffmeister, Dirk; Aasen, Helge; Brands, Jonas; +1 Authors

    Research in the field of precision agriculture is becoming increasingly important due to the growing world population whilst area for cultivation remains constant or declines. In this context, methods of monitoring in?season plant development with high resolution and accuracy are necessary. Studies show that terrestrial laser scanning (TLS) can be applied to capture small objects like crops. In this contribution, the results of multi-temporal field campaigns with the terrestrial laser scanner Riegl LMS-Z420i are shown. Four surveys were carried out in the growing period 2012 on a field experiment where various barley varieties were cultivated in small-scale plots. In order to measure the plant height above ground, the TLS-derived point clouds are interpolated to generate Crop Surface Models with a very high resolution of 1 cm. For all campaigns, a common reference surface, representing the Digital Elevation Model was used to monitor plant height in the investigated period. Manual plant height measurements were carried out to verify the results. The very high coefficients of determination (R² = 0.89) between both measurement methods show the applicability of the approach presented. Furthermore, destructive biomass sampling was performed to investigate the relation to plant height. Biomass is an important parameter for evaluating the actual crop status, but non-destructive methods of directly measuring crop biomass do not exist. Hence, other parameters like reflectance are considered. The focus of this study is on non-destructive measurements of plant height. The high coefficients of determination between plant height and fresh as well as dry biomass (R² = 0.80, R² = 0.77) support the usability of plant height as a predictor. The study presented here demonstrates the applicability of TLS in monitoring plant height development with a very high spatial resolution. Proceedings of the Workshop on UAV-based Remote Sensing Methods for Monitoring Vegetation Kölner geographische Arbeiten, 94 ISSN:0454-1294

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    Authors: Pozo Vázquez, David; Remund, Jan; Müller, Stefan C.; Traunmüller, Wolfgang; +9 Authors

    Power generation from photovoltaic systems is highly variable due to its dependence on meteorological conditions. An efficient use of this fluctuating energy source requires reliable forecast information for management and operation strategies. Due to the strong increase of solar power generation the prediction of solar yields becomes more and more important. As a consequence, in the last years various research organisations and companies have developed different methods to forecast irradiance as a basis for respective power forecasts. For the end-users of these forecasts it is important that standardized methodology is used when presenting results on the accuracy of a prediction model in order to get a clear idea on the advantages of a specific approach. In this paper we introduce a benchmarking procedure to asses the accuracy of irradiance forecasts and compare different approaches of forecasting. The evaluation shows a strong dependence of the forecast accuracy on the climatic conditions. For Central European stations the relative rmse ranges from 40 % to 60 %, for Spanish stations relative rmse values are in the range of 20 % to 35 %. 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 4199-4208

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    Authors: Pozo Vázquez, David; Remund, Jan; Müller, Stefan C.; Traunmüller, Wolfgang; +9 Authors

    Power generation from photovoltaic systems is highly variable due to its dependence on meteorological conditions. An efficient use of this fluctuating energy source requires reliable forecast information for management and operation strategies. Due to the strong increase of solar power generation the prediction of solar yields becomes more and more important. As a consequence, in the last years various research organisations and companies have developed different methods to forecast irradiance as a basis for respective power forecasts. For the end-users of these forecasts it is important that standardized methodology is used when presenting results on the accuracy of a prediction model in order to get a clear idea on the advantages of a specific approach. In this paper we introduce a benchmarking procedure to asses the accuracy of irradiance forecasts and compare different approaches of forecasting. The evaluation shows a strong dependence of the forecast accuracy on the climatic conditions. For Central European stations the relative rmse ranges from 40 % to 60 %, for Spanish stations relative rmse values are in the range of 20 % to 35 %. 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 4199-4208

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    Authors: Dubuis, Matthias;

    The current context leads energy system design to very demanding objectives, due to their variety. Indeed, despite an increasing energy demand, environment indicators are becoming always more important. So that for a given service, emission (and then associated consumption as well) is desired to decrease. Improving systems efficiencies is then a important step. Such a problem is formulated as an optimization. It is based on numerical models. Every models differs by definition from reality. This difference can be translated into uncertainties. Usually, they are considered at their most probable value. However, their variation can lead to consequences between a performance decrease and plant inoperability. It is then critical to take into account the deviation due to uncertainties when optimizing an energy system. The optimization problem will be described. It will introduce the description of functions and variables involved in energy system design. The formulation of the optimization under uncertainty will be developed, as well as mathematical methods for uncertainty propagation. Finally, an innovative method taking advantage of the high number of iterations due to the chosen solver will be described. In this study, pinch analysis has been applied. Its limits related to uncertainties treatment will be presented. Methods described here will be applied to an hybrid system of a fuel cell coupled with gas turbines. Results will be compared to a conventional optimization solutions. It will demonstrate that, despite sub-optimal objectives, the sensitivity of the system to uncertainties has been improved.

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    https://dx.doi.org/10.5075/epf...
    Doctoral thesis . 2012
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      https://dx.doi.org/10.5075/epf...
      Doctoral thesis . 2012
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    Authors: Dubuis, Matthias;

    The current context leads energy system design to very demanding objectives, due to their variety. Indeed, despite an increasing energy demand, environment indicators are becoming always more important. So that for a given service, emission (and then associated consumption as well) is desired to decrease. Improving systems efficiencies is then a important step. Such a problem is formulated as an optimization. It is based on numerical models. Every models differs by definition from reality. This difference can be translated into uncertainties. Usually, they are considered at their most probable value. However, their variation can lead to consequences between a performance decrease and plant inoperability. It is then critical to take into account the deviation due to uncertainties when optimizing an energy system. The optimization problem will be described. It will introduce the description of functions and variables involved in energy system design. The formulation of the optimization under uncertainty will be developed, as well as mathematical methods for uncertainty propagation. Finally, an innovative method taking advantage of the high number of iterations due to the chosen solver will be described. In this study, pinch analysis has been applied. Its limits related to uncertainties treatment will be presented. Methods described here will be applied to an hybrid system of a fuel cell coupled with gas turbines. Results will be compared to a conventional optimization solutions. It will demonstrate that, despite sub-optimal objectives, the sensitivity of the system to uncertainties has been improved.

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    Doctoral thesis . 2012
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    Authors: Feurer, Thomas;

    Photovoltaic (PV) energy generation has become one of the key pillars of the shift to a renewable energy future. Current devices, under favorable conditions, can already undercut the price per kWh electricity of other technologies on the market. Further reduction in the cost of installed PV systems and increase in solar module conversion efficiency will improve the affordability even more and will substantially aid in wider market penetration and enhance the volume of PV installations. Currently the PV market is dominated by silicon wafer based solar cells, but alternative technologies offer some distinctive advantages, making them interesting for numerous applications. Thin film technologies, as for example based on Cu(In,Ga)Se2 (CIGS) compound semiconductors with high optical absorption coefficient, are becoming important due to lower material and energy requirements for processing of high conversion efficiency solar cells. Inherent advantages are large area depositions with low production costs, and the possibilities for construction of lightweight, flexible devices with roll-to-roll manufacturing processes. The highest efficiency of single-junction CIGS solar cells is approaching the thermodynamic limit, making the use of alternative concepts such as concentration or multijunction (tandem-) devices the next logical step for further increase in efficiency beyond the Shockley-Queisser limit (S-Q limit). Especially the multi-junction technology, in which the thermodynamic losses are reduced by stacking of solar cells with different band gaps, decreasing thermalization of charge carriers excited with energies above the band gap, is a promising approach for enhanced utilization of the solar spectrum, yielding improved efficiency. Such devices, based on epitaxial layers of III-V compounds have already demonstrated remarkably high efficiencies beyond the S-Q limit. However, these devices grown on rather expensive single crystal wafers and with small size are prohibitively pricey for low cost terrestrial solar electricity generation. On the other hand, multi-junction solar cell technology based on polycrystalline thin films is an attractive option for large area, low cost production, provided adequately high efficiencies are achieved. In this context, two-junction tandem devices, developed by stacking a semitransparent large band gap solar cell of 1.6-1.7 eV on top of a low band gap (~1.0 eV) bottom cell, is a viable option. Earlier attempts in this direction were not so successful, but with the rise of perovskite thin film solar cells as a compatible high efficiency wide band gap (>1.6 eV) top cell and CIGS with a tunable band gap as bottom cell, the prospect for all thin film tandem devices with efficiencies beyond the single-junction limitations has opened. Such all thin film devices hold the potential for the low cost production necessary for large scale terrestrial application. This thesis focuses on the development of high efficiency narrow bandgap (1.0 eV) CIGS solar cells for application in all thin film tandem devices. While for CIGS with band gap of around 1.15 eV efficiencies of over 23 % have been demonstrated, cells with a narrow band gap close to 1.0 eV only reach 15.0 %. The efficiency of these narrow band gap cells are limited by charge carrier recombination, leading to low open circuit voltage (VOC) and reduced fill factor. For solar cell efficiency enhancement it is necessary to investigate the underlying reasons contributing to the deficits in PV parameters and develop processes to overcome the limiting factors. An option to reduce recombination within the solar cell is the implementation of a band gap grading as discussed in Chapter 3. The increase of the band gap at the location of highest recombination leads to a reduction in diode current, and therefore an increase in VOC. To keep the band gap of 1.0 eV a substantial part of the absorber needs to be Ga free. As the primary source of recombination is not obvious, different gradings (realized by a change in the Ga to In ratio) are implemented and compared. A single grading with increased band gap (higher Ga/In ratio) towards the front of the absorber shows no significant improvement on photovoltaic parameters. Any gain in VOC is offset by losses in current due to reduced charge collection, mainly visible for long wavelength photons and probably a result of the upwards bending in the conduction band. A single backgrading (higher Ga/In ratio towards the back electric contact) on the other hand leads to substantial improvements in performance ( from 12.0 % to 16.1 %). It is shown that the collection of photo-generated charge carriers improves and recombination is reduced. Measurements of the effective lifetime by time resolved photo-luminescence are carried out, showing an increase from approximately 20 ns to 100 ns when comparing ungraded with back-graded absorbers. By selectively changing the recombination speed at the back contact, strong differences in the behavior of cells with and without a band gap widening towards the back are observed. The results support that considerable recombination at the back contact is present in pure CIS solar cells, and that the single Ga back-grading approach is effective at suppressing this loss channel. In Chapter 4 the alkali treatment of CIS based solar cells is investigated. Alkali elements are known to strongly influence doping and passivation in CIGS solar cells. It is shown that the amount of sodium necessary to reach sufficient doping levels for high performance CIS solar cells is not achieved using the processes developed for CIGS. This may be based on insufficient Na diffusion into the grain, as those cells generally show larger grains than their CIGS counter parts, and since alkali migration energies in CIS are reported to be higher compared to those in CGS. If CIS cells are grown on soda lime glass without any diffusion barrier and additionally receive post deposition treatment (PDT) with NaF they still show low apparent doping concentration and poor PV performance ( = 10.9 %). However, additional annealing at ~ 370 C substrate temperature after PDT is shown to solve this problem, leading to an increase in apparent doping levels close to 1016 cm−3 and cell efficiency of 15.0 %. The application of an additional heavy alkali PDT, specifically RbF, is shown to lead to further improvements in cell efficiency. Changes at the front interface due to the PDT allow a decrease of buffer layer thickness, leading to a higher photo current (approximately + 1.0 mAcm−2). In addition, reduced recombination and the resulting increase in lifetime leads to additional gains in VOC, resulting in considerably improved device performance, up to an efficiency of 18.0 %. Further efficiency improvement is achieved by investigating the effect of close to stoichiometric compositions of Cu to group III elements as described in Chapter 5. The sub-stoichiometric Cu composition of state-of-the-art CIGS absorbers leads to a high concentration of detrimental defects. The defect density within the absorbers is reduced by approaching a stoichiometric Cu composition. Improvements in the defect density are identified by the decrease of Urbach energy from 20 to 16 mV and an increase in doping is observed for cells with almost stoichiometric Cu content. Cells with high, and especially stoichiometric Cu composition tend to be limited by recombination at the front interface, leading to a decrease of VOC of about 20 mV. Using the modified absorber surface after heavy alkali PDT, these losses are suppressed. Based on these improvements, a narrow band gap cell with record breaking 19.2 % efficiency and an open circuit voltage of 609 mV is achieved. Throughout the whole thesis the suitability of these cells for tandem devices with semitransparent perovskite top cells is investigated by 4-terminal tandem measurements. The improvements achieved in this work led to CIS based solar cells that not only show outstanding single cell performance, but also enable highly efficient tandem devices up to 25.0 %. They outperform state-of-the-art single junction CIGS and perovskite cells while showing prospects for further efficiency improvement. Due to the low band gap of the CIS absorber the current density from the bottom cell is high enough to produce current matched tandem devices with high efficient perovskite top cells (19.2 to 18.6 mAcm−2 in 4-terminal configuration), and also monolithic two-terminal configurations are feasible in the future.

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    Doctoral thesis . 2019
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    Doctoral thesis . 2019
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    Authors: Feurer, Thomas;

    Photovoltaic (PV) energy generation has become one of the key pillars of the shift to a renewable energy future. Current devices, under favorable conditions, can already undercut the price per kWh electricity of other technologies on the market. Further reduction in the cost of installed PV systems and increase in solar module conversion efficiency will improve the affordability even more and will substantially aid in wider market penetration and enhance the volume of PV installations. Currently the PV market is dominated by silicon wafer based solar cells, but alternative technologies offer some distinctive advantages, making them interesting for numerous applications. Thin film technologies, as for example based on Cu(In,Ga)Se2 (CIGS) compound semiconductors with high optical absorption coefficient, are becoming important due to lower material and energy requirements for processing of high conversion efficiency solar cells. Inherent advantages are large area depositions with low production costs, and the possibilities for construction of lightweight, flexible devices with roll-to-roll manufacturing processes. The highest efficiency of single-junction CIGS solar cells is approaching the thermodynamic limit, making the use of alternative concepts such as concentration or multijunction (tandem-) devices the next logical step for further increase in efficiency beyond the Shockley-Queisser limit (S-Q limit). Especially the multi-junction technology, in which the thermodynamic losses are reduced by stacking of solar cells with different band gaps, decreasing thermalization of charge carriers excited with energies above the band gap, is a promising approach for enhanced utilization of the solar spectrum, yielding improved efficiency. Such devices, based on epitaxial layers of III-V compounds have already demonstrated remarkably high efficiencies beyond the S-Q limit. However, these devices grown on rather expensive single crystal wafers and with small size are prohibitively pricey for low cost terrestrial solar electricity generation. On the other hand, multi-junction solar cell technology based on polycrystalline thin films is an attractive option for large area, low cost production, provided adequately high efficiencies are achieved. In this context, two-junction tandem devices, developed by stacking a semitransparent large band gap solar cell of 1.6-1.7 eV on top of a low band gap (~1.0 eV) bottom cell, is a viable option. Earlier attempts in this direction were not so successful, but with the rise of perovskite thin film solar cells as a compatible high efficiency wide band gap (>1.6 eV) top cell and CIGS with a tunable band gap as bottom cell, the prospect for all thin film tandem devices with efficiencies beyond the single-junction limitations has opened. Such all thin film devices hold the potential for the low cost production necessary for large scale terrestrial application. This thesis focuses on the development of high efficiency narrow bandgap (1.0 eV) CIGS solar cells for application in all thin film tandem devices. While for CIGS with band gap of around 1.15 eV efficiencies of over 23 % have been demonstrated, cells with a narrow band gap close to 1.0 eV only reach 15.0 %. The efficiency of these narrow band gap cells are limited by charge carrier recombination, leading to low open circuit voltage (VOC) and reduced fill factor. For solar cell efficiency enhancement it is necessary to investigate the underlying reasons contributing to the deficits in PV parameters and develop processes to overcome the limiting factors. An option to reduce recombination within the solar cell is the implementation of a band gap grading as discussed in Chapter 3. The increase of the band gap at the location of highest recombination leads to a reduction in diode current, and therefore an increase in VOC. To keep the band gap of 1.0 eV a substantial part of the absorber needs to be Ga free. As the primary source of recombination is not obvious, different gradings (realized by a change in the Ga to In ratio) are implemented and compared. A single grading with increased band gap (higher Ga/In ratio) towards the front of the absorber shows no significant improvement on photovoltaic parameters. Any gain in VOC is offset by losses in current due to reduced charge collection, mainly visible for long wavelength photons and probably a result of the upwards bending in the conduction band. A single backgrading (higher Ga/In ratio towards the back electric contact) on the other hand leads to substantial improvements in performance ( from 12.0 % to 16.1 %). It is shown that the collection of photo-generated charge carriers improves and recombination is reduced. Measurements of the effective lifetime by time resolved photo-luminescence are carried out, showing an increase from approximately 20 ns to 100 ns when comparing ungraded with back-graded absorbers. By selectively changing the recombination speed at the back contact, strong differences in the behavior of cells with and without a band gap widening towards the back are observed. The results support that considerable recombination at the back contact is present in pure CIS solar cells, and that the single Ga back-grading approach is effective at suppressing this loss channel. In Chapter 4 the alkali treatment of CIS based solar cells is investigated. Alkali elements are known to strongly influence doping and passivation in CIGS solar cells. It is shown that the amount of sodium necessary to reach sufficient doping levels for high performance CIS solar cells is not achieved using the processes developed for CIGS. This may be based on insufficient Na diffusion into the grain, as those cells generally show larger grains than their CIGS counter parts, and since alkali migration energies in CIS are reported to be higher compared to those in CGS. If CIS cells are grown on soda lime glass without any diffusion barrier and additionally receive post deposition treatment (PDT) with NaF they still show low apparent doping concentration and poor PV performance ( = 10.9 %). However, additional annealing at ~ 370 C substrate temperature after PDT is shown to solve this problem, leading to an increase in apparent doping levels close to 1016 cm−3 and cell efficiency of 15.0 %. The application of an additional heavy alkali PDT, specifically RbF, is shown to lead to further improvements in cell efficiency. Changes at the front interface due to the PDT allow a decrease of buffer layer thickness, leading to a higher photo current (approximately + 1.0 mAcm−2). In addition, reduced recombination and the resulting increase in lifetime leads to additional gains in VOC, resulting in considerably improved device performance, up to an efficiency of 18.0 %. Further efficiency improvement is achieved by investigating the effect of close to stoichiometric compositions of Cu to group III elements as described in Chapter 5. The sub-stoichiometric Cu composition of state-of-the-art CIGS absorbers leads to a high concentration of detrimental defects. The defect density within the absorbers is reduced by approaching a stoichiometric Cu composition. Improvements in the defect density are identified by the decrease of Urbach energy from 20 to 16 mV and an increase in doping is observed for cells with almost stoichiometric Cu content. Cells with high, and especially stoichiometric Cu composition tend to be limited by recombination at the front interface, leading to a decrease of VOC of about 20 mV. Using the modified absorber surface after heavy alkali PDT, these losses are suppressed. Based on these improvements, a narrow band gap cell with record breaking 19.2 % efficiency and an open circuit voltage of 609 mV is achieved. Throughout the whole thesis the suitability of these cells for tandem devices with semitransparent perovskite top cells is investigated by 4-terminal tandem measurements. The improvements achieved in this work led to CIS based solar cells that not only show outstanding single cell performance, but also enable highly efficient tandem devices up to 25.0 %. They outperform state-of-the-art single junction CIGS and perovskite cells while showing prospects for further efficiency improvement. Due to the low band gap of the CIS absorber the current density from the bottom cell is high enough to produce current matched tandem devices with high efficient perovskite top cells (19.2 to 18.6 mAcm−2 in 4-terminal configuration), and also monolithic two-terminal configurations are feasible in the future.

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    Doctoral thesis . 2019
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      Doctoral thesis . 2019
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Trivella, Alessio; id_orcid0000-0002-2614-5051; Corman, Francesco; id_orcid0000-0002-6036-5832;

    Abstract Book: 10th Symposium of the European Association for Research in Transport (hEART 2022)

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    Authors: Trivella, Alessio; id_orcid0000-0002-2614-5051; Corman, Francesco; id_orcid0000-0002-6036-5832;

    Abstract Book: 10th Symposium of the European Association for Research in Transport (hEART 2022)

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Research Collectionarrow_drop_down
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  • image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Authors: Ball, Jacques; Chesny, P.; Combet, M.; Fontaine, J.M.; +21 Authors

    We present a total of 191 and 203 data points of the elastic neutron-protonspin correlation parameters Aookk and Aoosk , respectively. Both observables were measured in a large angular interval. The observable Aookk was measured from 0.312 to 1.10 GeV and Aoosk from 0.80 to 1.10 GeV. The SATURNE II polarized beam of free neutrons obtained from the break-up of polarized deuterons was scattered on the polarized Saclay frozen-spin proton target. The beam polarization was oriented either along the beam direction or sideways, the target polarization was oriented longitudinally. Data are compared with phase-shift analyses predictions and with the PSI, LAMPF and SATURNE II results. Present results provide an important contribution to any future theoretical or phenomenological analysis.

    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Archive ouverte UNIG...arrow_drop_down
    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
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      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Archive ouverte UNIG...arrow_drop_down
      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
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  • image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
    Authors: Ball, Jacques; Chesny, P.; Combet, M.; Fontaine, J.M.; +21 Authors

    We present a total of 191 and 203 data points of the elastic neutron-protonspin correlation parameters Aookk and Aoosk , respectively. Both observables were measured in a large angular interval. The observable Aookk was measured from 0.312 to 1.10 GeV and Aoosk from 0.80 to 1.10 GeV. The SATURNE II polarized beam of free neutrons obtained from the break-up of polarized deuterons was scattered on the polarized Saclay frozen-spin proton target. The beam polarization was oriented either along the beam direction or sideways, the target polarization was oriented longitudinally. Data are compared with phase-shift analyses predictions and with the PSI, LAMPF and SATURNE II results. Present results provide an important contribution to any future theoretical or phenomenological analysis.

    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Archive ouverte UNIG...arrow_drop_down
    image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
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      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Archive ouverte UNIG...arrow_drop_down
      image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Dalton, C.; O Dwyer, B.; Taylor, D.; DeEyto, E.; +5 Authors

    Oligotrophic catchments with short spatey streams, upland lakes and peaty soils characterise northwest European Atlantic coastal regions. These catchments are important biodiversity refuges, particularly for sensitive diadromous fish populations but are subject to changes in land use and land management practices associated with afforestation, agriculture and rural development. Quantification of the degree of catchment degradation resulting from such anthropogenic impacts is often limited by a lack of long-term baseline data in what are generally relatively isolated, poorly studied catchments. This research uses a combination of palaeolimnological (radiometrically-dated variations in sedimentary geochemical elements, pollen, diatoms and remains of cladocera), census, and instrumental data, along with hindcast estimates to quantify environmental changes and their aquatic impacts since the late 19th century. The most likely drivers of any change are also identified. Results confirm an aquatic biotic response (phyto- and zooplankton) to soil erosion and nutrient enrichment associated with the onset of commercial conifer afforestation, effects that were subsequently enhanced as a result of increased overgrazing in the catchment and, possibly, climate warming. The implications for the health of aquatic resources in the catchment are discussed Environmental Protection Agency in Ireland (ILLUMINATE 2005-W-MS-40, P.McGinnity was supported by the Beaufort Marine Research Award in Fish Population Genetics funded by the Irish Government under the Sea Change Programme.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Marine Institute Ope...arrow_drop_down
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Dalton, C.; O Dwyer, B.; Taylor, D.; DeEyto, E.; +5 Authors

    Oligotrophic catchments with short spatey streams, upland lakes and peaty soils characterise northwest European Atlantic coastal regions. These catchments are important biodiversity refuges, particularly for sensitive diadromous fish populations but are subject to changes in land use and land management practices associated with afforestation, agriculture and rural development. Quantification of the degree of catchment degradation resulting from such anthropogenic impacts is often limited by a lack of long-term baseline data in what are generally relatively isolated, poorly studied catchments. This research uses a combination of palaeolimnological (radiometrically-dated variations in sedimentary geochemical elements, pollen, diatoms and remains of cladocera), census, and instrumental data, along with hindcast estimates to quantify environmental changes and their aquatic impacts since the late 19th century. The most likely drivers of any change are also identified. Results confirm an aquatic biotic response (phyto- and zooplankton) to soil erosion and nutrient enrichment associated with the onset of commercial conifer afforestation, effects that were subsequently enhanced as a result of increased overgrazing in the catchment and, possibly, climate warming. The implications for the health of aquatic resources in the catchment are discussed Environmental Protection Agency in Ireland (ILLUMINATE 2005-W-MS-40, P.McGinnity was supported by the Beaufort Marine Research Award in Fish Population Genetics funded by the Irish Government under the Sea Change Programme.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Marine Institute Ope...arrow_drop_down
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: University, Dublin City; Smartbay;

    The SmartBay NIAP fund was made available in 2012 through Dublin City University over a two year period to enable researchers to access the SmartBay Ireland National Test and Demonstration Facility in Galway Bay. Research proposals were invited for funding under a number of activity types that are in line with the objectives of the SmartBay PRTLI Cycle 5 programme. This fund provided small awards (typically €2-25K) to research teams through a national competitive process, which was open to all higher education institutions on the island of Ireland. There were both open and biannual calls. The SmartBay NIAP fund was established to enable researchers in academia and industry to access the SmartBay Ireland national test and demonstration infrastructure. Proposals to access the infrastructure were brief and required information on the researcher(s), a description of the proposed research and its potential impact to the research team arising from the access to SmartBay Ireland. Marine Institute

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Marine Institute Ope...arrow_drop_down
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: University, Dublin City; Smartbay;

    The SmartBay NIAP fund was made available in 2012 through Dublin City University over a two year period to enable researchers to access the SmartBay Ireland National Test and Demonstration Facility in Galway Bay. Research proposals were invited for funding under a number of activity types that are in line with the objectives of the SmartBay PRTLI Cycle 5 programme. This fund provided small awards (typically €2-25K) to research teams through a national competitive process, which was open to all higher education institutions on the island of Ireland. There were both open and biannual calls. The SmartBay NIAP fund was established to enable researchers in academia and industry to access the SmartBay Ireland national test and demonstration infrastructure. Proposals to access the infrastructure were brief and required information on the researcher(s), a description of the proposed research and its potential impact to the research team arising from the access to SmartBay Ireland. Marine Institute

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Marine Institute Ope...arrow_drop_down
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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    Authors: Mb Théodore Munyuli; J-M Mbaka Kavuvu; Guy Mulinganya; G Mulinganya Bwinja;

    Cholera epidemics have a recorded history in eastern Congo dating to 1971. A study was conducted to find out the linkage between climate variability/change and cholera outbreak and to assess the related economic cost in the management of cholera in Congo.This study integrates historical data (20 years) on temperature and rainfall with the burden of disease from cholera in South-Kivu province, eastern Congo.Analyses of precipitation and temperatures characteristics in South-Kivu provinces showed that cholera epidemics are closely associated with climatic factors variability. Peaks in Cholera new cases were in synchrony with peaks in rainfalls. Cholera infection cases declined significantly (P<0.05) with the rise in the average temperature. The monthly number of new Cholera cases oscillated between 5 and 450. For every rise of the average temperature by 0.35 °C to 0.75 °C degree Celsius, and for every change in the rainfall variability by 10-19%, it is likely cholera infection risks will increase by 17 to 25%. The medical cost of treatment of Cholera case infection was found to be of US$50 to 250 per capita. The total costs of Cholera attributable to climate change were found to fall in the range of 4 to 8% of the per capita in annual income in Bukavu town.It is likely that high rainfall favor multiplication of the bacteria and contamination of water sources by the bacteria (Vibrio cholerae). The consumption of polluted water, promiscuity, population density and lack of hygiene are determinants favoring spread and infection of the bacteria among human beings living in over-crowded environments.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Iranian Journal of P...arrow_drop_down
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    Iranian Journal of Public Health
    Article . 2013
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    Iranian Journal of Public Health
    Article . 2013
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      Iranian Journal of Public Health
      Article . 2013
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      Iranian Journal of Public Health
      Article . 2013
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    Authors: Mb Théodore Munyuli; J-M Mbaka Kavuvu; Guy Mulinganya; G Mulinganya Bwinja;

    Cholera epidemics have a recorded history in eastern Congo dating to 1971. A study was conducted to find out the linkage between climate variability/change and cholera outbreak and to assess the related economic cost in the management of cholera in Congo.This study integrates historical data (20 years) on temperature and rainfall with the burden of disease from cholera in South-Kivu province, eastern Congo.Analyses of precipitation and temperatures characteristics in South-Kivu provinces showed that cholera epidemics are closely associated with climatic factors variability. Peaks in Cholera new cases were in synchrony with peaks in rainfalls. Cholera infection cases declined significantly (P<0.05) with the rise in the average temperature. The monthly number of new Cholera cases oscillated between 5 and 450. For every rise of the average temperature by 0.35 °C to 0.75 °C degree Celsius, and for every change in the rainfall variability by 10-19%, it is likely cholera infection risks will increase by 17 to 25%. The medical cost of treatment of Cholera case infection was found to be of US$50 to 250 per capita. The total costs of Cholera attributable to climate change were found to fall in the range of 4 to 8% of the per capita in annual income in Bukavu town.It is likely that high rainfall favor multiplication of the bacteria and contamination of water sources by the bacteria (Vibrio cholerae). The consumption of polluted water, promiscuity, population density and lack of hygiene are determinants favoring spread and infection of the bacteria among human beings living in over-crowded environments.

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    Iranian Journal of Public Health
    Article . 2013
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    Iranian Journal of Public Health
    Article . 2013
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      Iranian Journal of Public Health
      Article . 2013
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      Iranian Journal of Public Health
      Article . 2013
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    Authors: McCarthy, Colm; Scott, Sue;

    non-peer-reviewed

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    EconStor
    Research . 2008
    Data sources: EconStor
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      EconStor
      Research . 2008
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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    Authors: McCarthy, Colm; Scott, Sue;

    non-peer-reviewed

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    EconStor
    Research . 2008
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      EconStor
      Research . 2008
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    Authors: Tilly, Nora; Hoffmeister, Dirk; Aasen, Helge; Brands, Jonas; +1 Authors

    Research in the field of precision agriculture is becoming increasingly important due to the growing world population whilst area for cultivation remains constant or declines. In this context, methods of monitoring in?season plant development with high resolution and accuracy are necessary. Studies show that terrestrial laser scanning (TLS) can be applied to capture small objects like crops. In this contribution, the results of multi-temporal field campaigns with the terrestrial laser scanner Riegl LMS-Z420i are shown. Four surveys were carried out in the growing period 2012 on a field experiment where various barley varieties were cultivated in small-scale plots. In order to measure the plant height above ground, the TLS-derived point clouds are interpolated to generate Crop Surface Models with a very high resolution of 1 cm. For all campaigns, a common reference surface, representing the Digital Elevation Model was used to monitor plant height in the investigated period. Manual plant height measurements were carried out to verify the results. The very high coefficients of determination (R² = 0.89) between both measurement methods show the applicability of the approach presented. Furthermore, destructive biomass sampling was performed to investigate the relation to plant height. Biomass is an important parameter for evaluating the actual crop status, but non-destructive methods of directly measuring crop biomass do not exist. Hence, other parameters like reflectance are considered. The focus of this study is on non-destructive measurements of plant height. The high coefficients of determination between plant height and fresh as well as dry biomass (R² = 0.80, R² = 0.77) support the usability of plant height as a predictor. The study presented here demonstrates the applicability of TLS in monitoring plant height development with a very high spatial resolution. Proceedings of the Workshop on UAV-based Remote Sensing Methods for Monitoring Vegetation Kölner geographische Arbeiten, 94 ISSN:0454-1294

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    Conference object . 2014
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    Authors: Tilly, Nora; Hoffmeister, Dirk; Aasen, Helge; Brands, Jonas; +1 Authors

    Research in the field of precision agriculture is becoming increasingly important due to the growing world population whilst area for cultivation remains constant or declines. In this context, methods of monitoring in?season plant development with high resolution and accuracy are necessary. Studies show that terrestrial laser scanning (TLS) can be applied to capture small objects like crops. In this contribution, the results of multi-temporal field campaigns with the terrestrial laser scanner Riegl LMS-Z420i are shown. Four surveys were carried out in the growing period 2012 on a field experiment where various barley varieties were cultivated in small-scale plots. In order to measure the plant height above ground, the TLS-derived point clouds are interpolated to generate Crop Surface Models with a very high resolution of 1 cm. For all campaigns, a common reference surface, representing the Digital Elevation Model was used to monitor plant height in the investigated period. Manual plant height measurements were carried out to verify the results. The very high coefficients of determination (R² = 0.89) between both measurement methods show the applicability of the approach presented. Furthermore, destructive biomass sampling was performed to investigate the relation to plant height. Biomass is an important parameter for evaluating the actual crop status, but non-destructive methods of directly measuring crop biomass do not exist. Hence, other parameters like reflectance are considered. The focus of this study is on non-destructive measurements of plant height. The high coefficients of determination between plant height and fresh as well as dry biomass (R² = 0.80, R² = 0.77) support the usability of plant height as a predictor. The study presented here demonstrates the applicability of TLS in monitoring plant height development with a very high spatial resolution. Proceedings of the Workshop on UAV-based Remote Sensing Methods for Monitoring Vegetation Kölner geographische Arbeiten, 94 ISSN:0454-1294

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    Authors: Pozo Vázquez, David; Remund, Jan; Müller, Stefan C.; Traunmüller, Wolfgang; +9 Authors

    Power generation from photovoltaic systems is highly variable due to its dependence on meteorological conditions. An efficient use of this fluctuating energy source requires reliable forecast information for management and operation strategies. Due to the strong increase of solar power generation the prediction of solar yields becomes more and more important. As a consequence, in the last years various research organisations and companies have developed different methods to forecast irradiance as a basis for respective power forecasts. For the end-users of these forecasts it is important that standardized methodology is used when presenting results on the accuracy of a prediction model in order to get a clear idea on the advantages of a specific approach. In this paper we introduce a benchmarking procedure to asses the accuracy of irradiance forecasts and compare different approaches of forecasting. The evaluation shows a strong dependence of the forecast accuracy on the climatic conditions. For Central European stations the relative rmse ranges from 40 % to 60 %, for Spanish stations relative rmse values are in the range of 20 % to 35 %. 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 4199-4208

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    Authors: Pozo Vázquez, David; Remund, Jan; Müller, Stefan C.; Traunmüller, Wolfgang; +9 Authors

    Power generation from photovoltaic systems is highly variable due to its dependence on meteorological conditions. An efficient use of this fluctuating energy source requires reliable forecast information for management and operation strategies. Due to the strong increase of solar power generation the prediction of solar yields becomes more and more important. As a consequence, in the last years various research organisations and companies have developed different methods to forecast irradiance as a basis for respective power forecasts. For the end-users of these forecasts it is important that standardized methodology is used when presenting results on the accuracy of a prediction model in order to get a clear idea on the advantages of a specific approach. In this paper we introduce a benchmarking procedure to asses the accuracy of irradiance forecasts and compare different approaches of forecasting. The evaluation shows a strong dependence of the forecast accuracy on the climatic conditions. For Central European stations the relative rmse ranges from 40 % to 60 %, for Spanish stations relative rmse values are in the range of 20 % to 35 %. 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 4199-4208

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    Authors: Dubuis, Matthias;

    The current context leads energy system design to very demanding objectives, due to their variety. Indeed, despite an increasing energy demand, environment indicators are becoming always more important. So that for a given service, emission (and then associated consumption as well) is desired to decrease. Improving systems efficiencies is then a important step. Such a problem is formulated as an optimization. It is based on numerical models. Every models differs by definition from reality. This difference can be translated into uncertainties. Usually, they are considered at their most probable value. However, their variation can lead to consequences between a performance decrease and plant inoperability. It is then critical to take into account the deviation due to uncertainties when optimizing an energy system. The optimization problem will be described. It will introduce the description of functions and variables involved in energy system design. The formulation of the optimization under uncertainty will be developed, as well as mathematical methods for uncertainty propagation. Finally, an innovative method taking advantage of the high number of iterations due to the chosen solver will be described. In this study, pinch analysis has been applied. Its limits related to uncertainties treatment will be presented. Methods described here will be applied to an hybrid system of a fuel cell coupled with gas turbines. Results will be compared to a conventional optimization solutions. It will demonstrate that, despite sub-optimal objectives, the sensitivity of the system to uncertainties has been improved.

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    https://dx.doi.org/10.5075/epf...
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    Authors: Dubuis, Matthias;

    The current context leads energy system design to very demanding objectives, due to their variety. Indeed, despite an increasing energy demand, environment indicators are becoming always more important. So that for a given service, emission (and then associated consumption as well) is desired to decrease. Improving systems efficiencies is then a important step. Such a problem is formulated as an optimization. It is based on numerical models. Every models differs by definition from reality. This difference can be translated into uncertainties. Usually, they are considered at their most probable value. However, their variation can lead to consequences between a performance decrease and plant inoperability. It is then critical to take into account the deviation due to uncertainties when optimizing an energy system. The optimization problem will be described. It will introduce the description of functions and variables involved in energy system design. The formulation of the optimization under uncertainty will be developed, as well as mathematical methods for uncertainty propagation. Finally, an innovative method taking advantage of the high number of iterations due to the chosen solver will be described. In this study, pinch analysis has been applied. Its limits related to uncertainties treatment will be presented. Methods described here will be applied to an hybrid system of a fuel cell coupled with gas turbines. Results will be compared to a conventional optimization solutions. It will demonstrate that, despite sub-optimal objectives, the sensitivity of the system to uncertainties has been improved.

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    Authors: Feurer, Thomas;

    Photovoltaic (PV) energy generation has become one of the key pillars of the shift to a renewable energy future. Current devices, under favorable conditions, can already undercut the price per kWh electricity of other technologies on the market. Further reduction in the cost of installed PV systems and increase in solar module conversion efficiency will improve the affordability even more and will substantially aid in wider market penetration and enhance the volume of PV installations. Currently the PV market is dominated by silicon wafer based solar cells, but alternative technologies offer some distinctive advantages, making them interesting for numerous applications. Thin film technologies, as for example based on Cu(In,Ga)Se2 (CIGS) compound semiconductors with high optical absorption coefficient, are becoming important due to lower material and energy requirements for processing of high conversion efficiency solar cells. Inherent advantages are large area depositions with low production costs, and the possibilities for construction of lightweight, flexible devices with roll-to-roll manufacturing processes. The highest efficiency of single-junction CIGS solar cells is approaching the thermodynamic limit, making the use of alternative concepts such as concentration or multijunction (tandem-) devices the next logical step for further increase in efficiency beyond the Shockley-Queisser limit (S-Q limit). Especially the multi-junction technology, in which the thermodynamic losses are reduced by stacking of solar cells with different band gaps, decreasing thermalization of charge carriers excited with energies above the band gap, is a promising approach for enhanced utilization of the solar spectrum, yielding improved efficiency. Such devices, based on epitaxial layers of III-V compounds have already demonstrated remarkably high efficiencies beyond the S-Q limit. However, these devices grown on rather expensive single crystal wafers and with small size are prohibitively pricey for low cost terrestrial solar electricity generation. On the other hand, multi-junction solar cell technology based on polycrystalline thin films is an attractive option for large area, low cost production, provided adequately high efficiencies are achieved. In this context, two-junction tandem devices, developed by stacking a semitransparent large band gap solar cell of 1.6-1.7 eV on top of a low band gap (~1.0 eV) bottom cell, is a viable option. Earlier attempts in this direction were not so successful, but with the rise of perovskite thin film solar cells as a compatible high efficiency wide band gap (>1.6 eV) top cell and CIGS with a tunable band gap as bottom cell, the prospect for all thin film tandem devices with efficiencies beyond the single-junction limitations has opened. Such all thin film devices hold the potential for the low cost production necessary for large scale terrestrial application. This thesis focuses on the development of high efficiency narrow bandgap (1.0 eV) CIGS solar cells for application in all thin film tandem devices. While for CIGS with band gap of around 1.15 eV efficiencies of over 23 % have been demonstrated, cells with a narrow band gap close to 1.0 eV only reach 15.0 %. The efficiency of these narrow band gap cells are limited by charge carrier recombination, leading to low open circuit voltage (VOC) and reduced fill factor. For solar cell efficiency enhancement it is necessary to investigate the underlying reasons contributing to the deficits in PV parameters and develop processes to overcome the limiting factors. An option to reduce recombination within the solar cell is the implementation of a band gap grading as discussed in Chapter 3. The increase of the band gap at the location of highest recombination leads to a reduction in diode current, and therefore an increase in VOC. To keep the band gap of 1.0 eV a substantial part of the absorber needs to be Ga free. As the primary source of recombination is not obvious, different gradings (realized by a change in the Ga to In ratio) are implemented and compared. A single grading with increased band gap (higher Ga/In ratio) towards the front of the absorber shows no significant improvement on photovoltaic parameters. Any gain in VOC is offset by losses in current due to reduced charge collection, mainly visible for long wavelength photons and probably a result of the upwards bending in the conduction band. A single backgrading (higher Ga/In ratio towards the back electric contact) on the other hand leads to substantial improvements in performance ( from 12.0 % to 16.1 %). It is shown that the collection of photo-generated charge carriers improves and recombination is reduced. Measurements of the effective lifetime by time resolved photo-luminescence are carried out, showing an increase from approximately 20 ns to 100 ns when comparing ungraded with back-graded absorbers. By selectively changing the recombination speed at the back contact, strong differences in the behavior of cells with and without a band gap widening towards the back are observed. The results support that considerable recombination at the back contact is present in pure CIS solar cells, and that the single Ga back-grading approach is effective at suppressing this loss channel. In Chapter 4 the alkali treatment of CIS based solar cells is investigated. Alkali elements are known to strongly influence doping and passivation in CIGS solar cells. It is shown that the amount of sodium necessary to reach sufficient doping levels for high performance CIS solar cells is not achieved using the processes developed for CIGS. This may be based on insufficient Na diffusion into the grain, as those cells generally show larger grains than their CIGS counter parts, and since alkali migration energies in CIS are reported to be higher compared to those in CGS. If CIS cells are grown on soda lime glass without any diffusion barrier and additionally receive post deposition treatment (PDT) with NaF they still show low apparent doping concentration and poor PV performance ( = 10.9 %). However, additional annealing at ~ 370 C substrate temperature after PDT is shown to solve this problem, leading to an increase in apparent doping levels close to 1016 cm−3 and cell efficiency of 15.0 %. The application of an additional heavy alkali PDT, specifically RbF, is shown to lead to further improvements in cell efficiency. Changes at the front interface due to the PDT allow a decrease of buffer layer thickness, leading to a higher photo current (approximately + 1.0 mAcm−2). In addition, reduced recombination and the resulting increase in lifetime leads to additional gains in VOC, resulting in considerably improved device performance, up to an efficiency of 18.0 %. Further efficiency improvement is achieved by investigating the effect of close to stoichiometric compositions of Cu to group III elements as described in Chapter 5. The sub-stoichiometric Cu composition of state-of-the-art CIGS absorbers leads to a high concentration of detrimental defects. The defect density within the absorbers is reduced by approaching a stoichiometric Cu composition. Improvements in the defect density are identified by the decrease of Urbach energy from 20 to 16 mV and an increase in doping is observed for cells with almost stoichiometric Cu content. Cells with high, and especially stoichiometric Cu composition tend to be limited by recombination at the front interface, leading to a decrease of VOC of about 20 mV. Using the modified absorber surface after heavy alkali PDT, these losses are suppressed. Based on these improvements, a narrow band gap cell with record breaking 19.2 % efficiency and an open circuit voltage of 609 mV is achieved. Throughout the whole thesis the suitability of these cells for tandem devices with semitransparent perovskite top cells is investigated by 4-terminal tandem measurements. The improvements achieved in this work led to CIS based solar cells that not only show outstanding single cell performance, but also enable highly efficient tandem devices up to 25.0 %. They outperform state-of-the-art single junction CIGS and perovskite cells while showing prospects for further efficiency improvement. Due to the low band gap of the CIS absorber the current density from the bottom cell is high enough to produce current matched tandem devices with high efficient perovskite top cells (19.2 to 18.6 mAcm−2 in 4-terminal configuration), and also monolithic two-terminal configurations are feasible in the future.

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    Authors: Feurer, Thomas;

    Photovoltaic (PV) energy generation has become one of the key pillars of the shift to a renewable energy future. Current devices, under favorable conditions, can already undercut the price per kWh electricity of other technologies on the market. Further reduction in the cost of installed PV systems and increase in solar module conversion efficiency will improve the affordability even more and will substantially aid in wider market penetration and enhance the volume of PV installations. Currently the PV market is dominated by silicon wafer based solar cells, but alternative technologies offer some distinctive advantages, making them interesting for numerous applications. Thin film technologies, as for example based on Cu(In,Ga)Se2 (CIGS) compound semiconductors with high optical absorption coefficient, are becoming important due to lower material and energy requirements for processing of high conversion efficiency solar cells. Inherent advantages are large area depositions with low production costs, and the possibilities for construction of lightweight, flexible devices with roll-to-roll manufacturing processes. The highest efficiency of single-junction CIGS solar cells is approaching the thermodynamic limit, making the use of alternative concepts such as concentration or multijunction (tandem-) devices the next logical step for further increase in efficiency beyond the Shockley-Queisser limit (S-Q limit). Especially the multi-junction technology, in which the thermodynamic losses are reduced by stacking of solar cells with different band gaps, decreasing thermalization of charge carriers excited with energies above the band gap, is a promising approach for enhanced utilization of the solar spectrum, yielding improved efficiency. Such devices, based on epitaxial layers of III-V compounds have already demonstrated remarkably high efficiencies beyond the S-Q limit. However, these devices grown on rather expensive single crystal wafers and with small size are prohibitively pricey for low cost terrestrial solar electricity generation. On the other hand, multi-junction solar cell technology based on polycrystalline thin films is an attractive option for large area, low cost production, provided adequately high efficiencies are achieved. In this context, two-junction tandem devices, developed by stacking a semitransparent large band gap solar cell of 1.6-1.7 eV on top of a low band gap (~1.0 eV) bottom cell, is a viable option. Earlier attempts in this direction were not so successful, but with the rise of perovskite thin film solar cells as a compatible high efficiency wide band gap (>1.6 eV) top cell and CIGS with a tunable band gap as bottom cell, the prospect for all thin film tandem devices with efficiencies beyond the single-junction limitations has opened. Such all thin film devices hold the potential for the low cost production necessary for large scale terrestrial application. This thesis focuses on the development of high efficiency narrow bandgap (1.0 eV) CIGS solar cells for application in all thin film tandem devices. While for CIGS with band gap of around 1.15 eV efficiencies of over 23 % have been demonstrated, cells with a narrow band gap close to 1.0 eV only reach 15.0 %. The efficiency of these narrow band gap cells are limited by charge carrier recombination, leading to low open circuit voltage (VOC) and reduced fill factor. For solar cell efficiency enhancement it is necessary to investigate the underlying reasons contributing to the deficits in PV parameters and develop processes to overcome the limiting factors. An option to reduce recombination within the solar cell is the implementation of a band gap grading as discussed in Chapter 3. The increase of the band gap at the location of highest recombination leads to a reduction in diode current, and therefore an increase in VOC. To keep the band gap of 1.0 eV a substantial part of the absorber needs to be Ga free. As the primary source of recombination is not obvious, different gradings (realized by a change in the Ga to In ratio) are implemented and compared. A single grading with increased band gap (higher Ga/In ratio) towards the front of the absorber shows no significant improvement on photovoltaic parameters. Any gain in VOC is offset by losses in current due to reduced charge collection, mainly visible for long wavelength photons and probably a result of the upwards bending in the conduction band. A single backgrading (higher Ga/In ratio towards the back electric contact) on the other hand leads to substantial improvements in performance ( from 12.0 % to 16.1 %). It is shown that the collection of photo-generated charge carriers improves and recombination is reduced. Measurements of the effective lifetime by time resolved photo-luminescence are carried out, showing an increase from approximately 20 ns to 100 ns when comparing ungraded with back-graded absorbers. By selectively changing the recombination speed at the back contact, strong differences in the behavior of cells with and without a band gap widening towards the back are observed. The results support that considerable recombination at the back contact is present in pure CIS solar cells, and that the single Ga back-grading approach is effective at suppressing this loss channel. In Chapter 4 the alkali treatment of CIS based solar cells is investigated. Alkali elements are known to strongly influence doping and passivation in CIGS solar cells. It is shown that the amount of sodium necessary to reach sufficient doping levels for high performance CIS solar cells is not achieved using the processes developed for CIGS. This may be based on insufficient Na diffusion into the grain, as those cells generally show larger grains than their CIGS counter parts, and since alkali migration energies in CIS are reported to be higher compared to those in CGS. If CIS cells are grown on soda lime glass without any diffusion barrier and additionally receive post deposition treatment (PDT) with NaF they still show low apparent doping concentration and poor PV performance ( = 10.9 %). However, additional annealing at ~ 370 C substrate temperature after PDT is shown to solve this problem, leading to an increase in apparent doping levels close to 1016 cm−3 and cell efficiency of 15.0 %. The application of an additional heavy alkali PDT, specifically RbF, is shown to lead to further improvements in cell efficiency. Changes at the front interface due to the PDT allow a decrease of buffer layer thickness, leading to a higher photo current (approximately + 1.0 mAcm−2). In addition, reduced recombination and the resulting increase in lifetime leads to additional gains in VOC, resulting in considerably improved device performance, up to an efficiency of 18.0 %. Further efficiency improvement is achieved by investigating the effect of close to stoichiometric compositions of Cu to group III elements as described in Chapter 5. The sub-stoichiometric Cu composition of state-of-the-art CIGS absorbers leads to a high concentration of detrimental defects. The defect density within the absorbers is reduced by approaching a stoichiometric Cu composition. Improvements in the defect density are identified by the decrease of Urbach energy from 20 to 16 mV and an increase in doping is observed for cells with almost stoichiometric Cu content. Cells with high, and especially stoichiometric Cu composition tend to be limited by recombination at the front interface, leading to a decrease of VOC of about 20 mV. Using the modified absorber surface after heavy alkali PDT, these losses are suppressed. Based on these improvements, a narrow band gap cell with record breaking 19.2 % efficiency and an open circuit voltage of 609 mV is achieved. Throughout the whole thesis the suitability of these cells for tandem devices with semitransparent perovskite top cells is investigated by 4-terminal tandem measurements. The improvements achieved in this work led to CIS based solar cells that not only show outstanding single cell performance, but also enable highly efficient tandem devices up to 25.0 %. They outperform state-of-the-art single junction CIGS and perovskite cells while showing prospects for further efficiency improvement. Due to the low band gap of the CIS absorber the current density from the bottom cell is high enough to produce current matched tandem devices with high efficient perovskite top cells (19.2 to 18.6 mAcm−2 in 4-terminal configuration), and also monolithic two-terminal configurations are feasible in the future.

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    Authors: Trivella, Alessio; id_orcid0000-0002-2614-5051; Corman, Francesco; id_orcid0000-0002-6036-5832;

    Abstract Book: 10th Symposium of the European Association for Research in Transport (hEART 2022)

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    Authors: Trivella, Alessio; id_orcid0000-0002-2614-5051; Corman, Francesco; id_orcid0000-0002-6036-5832;

    Abstract Book: 10th Symposium of the European Association for Research in Transport (hEART 2022)

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