1,267 research outputs found
GDAT intercomparison exercice on CFCs and SF6 tracers for groundwater dating
No full textInternational audienceGDAT intercomparison exercice on CFCs and SF6 tracers for groundwater dating Labasque T. Géosciences Rennes, Université Rennes1-CNRS, Rennes, France GDAT-participants for CFCs and SF6 comparisons: Aquilina L., Vergnaud V., Geosciences Rennes, France; Goody D., BGS Wallingford, UK; Leaney F., Suckow A., CSIRO, Australia; Oster H, Spurentofflabor, Germany; Han L., Hillegonds D, Matsumoto T., IAEA, Austria; Aeschbach-Hertig W., Freund F., Schneider T., Heidelberg, Germany; Yoon Y., Kigam, Corea; Busenberg E., Casile J., USGS Reston Lab, USA; Rosanski K., Bartysel J., AGH, Poland; Sliwka I., Bielewski J., INP, Poland; Rigby A., Solomon K;, University of Utah, USA; Barbecot F., IDES, France. Two intercomparison exercises have been carried out in 2012 by the hydrogeochemist community : Fontainebleau sandy aquifer (January 2012) and Betton fractured shists aquifer (October 2012). Environmental tracers devoted to groundwater dating were compared during these experiments. These methods are very sensitive and need a great analytical practice to obtain accurate results. The GDAT exercise was designed in order to compare methods and analytical protocols. All the participants sampled groundwater from the same boreholes at the same time using similar sampling methods, and analysed similar environmental tracers using for each laboratory its own analytical protocol. We here present CFCs and SF6 results obtained on the Fontainebleau aquifer and on the Betton aquifer. The first one shows quite "old" CFC waters and the second one "younger" CFCs waters. The intercomparison exercise brought together 31 laboratories from 14 countries including 12 laboratories for CFCs analysis and 11 for SF6 analysis. Results show good agreement for most of the laboratories with apparent uncertainties less than 3 years on the quite "old" CFCs waters. The major uncertainty source results from sampling and storage methods
GDAT intercomparison exercice on CFCs and SF6 tracers for groundwater dating
No full textInternational audienceGDAT intercomparison exercice on CFCs and SF6 tracers for groundwater dating Labasque T. Géosciences Rennes, Université Rennes1-CNRS, Rennes, France GDAT-participants for CFCs and SF6 comparisons: Aquilina L., Vergnaud V., Geosciences Rennes, France; Goody D., BGS Wallingford, UK; Leaney F., Suckow A., CSIRO, Australia; Oster H, Spurentofflabor, Germany; Han L., Hillegonds D, Matsumoto T., IAEA, Austria; Aeschbach-Hertig W., Freund F., Schneider T., Heidelberg, Germany; Yoon Y., Kigam, Corea; Busenberg E., Casile J., USGS Reston Lab, USA; Rosanski K., Bartysel J., AGH, Poland; Sliwka I., Bielewski J., INP, Poland; Rigby A., Solomon K;, University of Utah, USA; Barbecot F., IDES, France. Two intercomparison exercises have been carried out in 2012 by the hydrogeochemist community : Fontainebleau sandy aquifer (January 2012) and Betton fractured shists aquifer (October 2012). Environmental tracers devoted to groundwater dating were compared during these experiments. These methods are very sensitive and need a great analytical practice to obtain accurate results. The GDAT exercise was designed in order to compare methods and analytical protocols. All the participants sampled groundwater from the same boreholes at the same time using similar sampling methods, and analysed similar environmental tracers using for each laboratory its own analytical protocol. We here present CFCs and SF6 results obtained on the Fontainebleau aquifer and on the Betton aquifer. The first one shows quite "old" CFC waters and the second one "younger" CFCs waters. The intercomparison exercise brought together 31 laboratories from 14 countries including 12 laboratories for CFCs analysis and 11 for SF6 analysis. Results show good agreement for most of the laboratories with apparent uncertainties less than 3 years on the quite "old" CFCs waters. The major uncertainty source results from sampling and storage methods
The External Dimension of EU Justice and Home Affairs: Tools, Processes, Outcomes
No full textThis working document offers a conceptual framework for understanding the processes underpinning the external dimension of EU Justice and Home Affairs (ED-JHA). Practically, it defines how the export of JHA principles and norms inform the geopolitical ambitions of the EU, i.e. the use of space for political purposes, or the control and management of people, objects and movement. The author begins by investigating how the ENP reconfigures the ED-JHA, and then goes on to discuss various conceptual stances on governance, specifically institutionalism, constructivism, and policy instruments. To conclude he traces the evolution of this external dimension, emphasising, whenever possible, its continuities and bifurcations. Overall, the aim is to ascertain the extent to which conceptual designs clarify or advance our knowledge of the contents and rationales of the ED-JHA.neighbourhood policy, international politics, geopolitics, migration,immigration, European security, policy instruments, governance, Security and Justice,Justice and Home Affairs
A glimpse of the Anthropocene captured by environmental tracers in the groundwater of a fractured aquifer
No full textInternational audienceGoldschmidt 2021 Abstracthttps://doi.org/10.7185/gold2021.6897A glimpse of the Anthropocenecaptured by environmental tracers inthe groundwater of a fracturedaquiferDR. ELIOT CHATTON1, THIERRY LABASQUE2,WERNER AESCHBACH3, VIRGINIE VERGNAUD2 ANDLUC AQUILINA41CNRS UMR61182Univ. Rennes, CNRS, UMS 33433Institute of Environmental Physics4Université de Rennes 1 Géosciences Rennes UMR 6118Presenting Author: [email protected] Anthropocene is an epoch in Earth’s history that has beenproposed to characterise the global impact of human activities onthe Earth's atmosphere, biosphere, hydrosphere, geosphere, i.e.the Critical Zone.Just as for past climates, the signature of these anthropogenicimpacts are recorded by environmental tracers dissolved ingroundwater that could provide a better understanding ofgroundwater flows, residence time and mixing thus providinginformation on this major water resource both in terms ofquantity and quality.In this study, we use dissolved gases (CFCs, SF6, 4He, 14C,noble gases, VOCs, stable isotopes) and groundwater chemicalcomposition as environmental tracers to unveil insights of theAnthropocene in a fractured aquifer in the northwest of France.We analyse the impact of groundwater abstraction on residencetime and excess air composition. We evidence the influence ofclimate change on groundwater recharge temperature (noble gastemperatures, NGT). We also quantify the appearance ofanthropogenic compounds over the last decades.These observations enable us to define the Anthropocenesignature in groundwater and the distribution of its impacts onthe groundwater resource in order to gain a better picture of itsresilience in the future
The External Dimension of EU Justice and Home Affairs: Tools, Processes, Outcomes. CEPS Working Document No. 303, September 2008
No full textThis working document offers a conceptual framework for understanding the processes underpinning the external dimension of EU Justice and Home Affairs (ED-JHA). Practically, it defines how the export of JHA principles and norms inform the geopolitical ambitions of the EU, i.e. the use of space for political purposes, or the control and management of people, objects and movement. The author begins by investigating how the ENP reconfigures the ED-JHA, and then goes on to discuss various conceptual stances on governance, specifically institutionalism, constructivism, and policy instruments. To conclude he traces the evolution of this external dimension, emphasising, whenever possible, its continuities and bifurcations. Overall, the aim is to ascertain the extent to which conceptual designs clarify or advance our knowledge of the contents and rationales of the ED-JHA
Quantification of conservative and reactive transport using a singlegroundwater tracer test in a fractured media
No full textInternational audiencedentification of biogeochemical reactions in aquifers and determining kinetics is important for the predictionof contaminant transport in aquifers and groundwater management. Therefore, experiments accounting for bothconservative and reactive transport are essential to understand the biogeochemical reactivity at field scale.This study presents the results of a groundwater tracer test using the combined injection of dissolved conservativeand reactive tracers (He, Xe, Ar, Br-, O2and NO3-) in order to evaluate the transport properties of a fracturedmedia in Brittany, France.Dissolved gas concentrations were continuously monitored in situ with a CF-MIMS (Chatton et al, 2016) allowinga high frequency (1 gas every 2 seconds) multi-tracer analysis (N2, O2, CO2, CH4, N2O, H2, He, Ne, Ar, Kr, Xe)over a large resolution (6 orders of magnitude). Along with dissolved gases, groundwater biogeochemistry wasmonitored through the sampling of major anions and cations, trace elements and microbiological diversity.The results show breakthrough curves allowing the combined quantification of conservative and reactive transportproperties. This ongoing work is an original approach investigating the link between heterogeneity of porousmedia and biogeochemical reactions at field scale.Eliot Chatton, Thierry Labasque, Je ́roˆme de La Bernardie, Nicolas Guihe ́neuf, Olivier Bour and LucAquilina; Field Continuous Measurement of Dissolved Gases with a CF-MIMS: Applications to the Physics andBiogeochemistry of Groundwater Flow; Environmental Science & Technology, in press, 2016
Quantification of conservative and reactive transport using a singlegroundwater tracer test in a fractured media
No full textInternational audiencedentification of biogeochemical reactions in aquifers and determining kinetics is important for the predictionof contaminant transport in aquifers and groundwater management. Therefore, experiments accounting for bothconservative and reactive transport are essential to understand the biogeochemical reactivity at field scale.This study presents the results of a groundwater tracer test using the combined injection of dissolved conservativeand reactive tracers (He, Xe, Ar, Br-, O2and NO3-) in order to evaluate the transport properties of a fracturedmedia in Brittany, France.Dissolved gas concentrations were continuously monitored in situ with a CF-MIMS (Chatton et al, 2016) allowinga high frequency (1 gas every 2 seconds) multi-tracer analysis (N2, O2, CO2, CH4, N2O, H2, He, Ne, Ar, Kr, Xe)over a large resolution (6 orders of magnitude). Along with dissolved gases, groundwater biogeochemistry wasmonitored through the sampling of major anions and cations, trace elements and microbiological diversity.The results show breakthrough curves allowing the combined quantification of conservative and reactive transportproperties. This ongoing work is an original approach investigating the link between heterogeneity of porousmedia and biogeochemical reactions at field scale.Eliot Chatton, Thierry Labasque, Je ́roˆme de La Bernardie, Nicolas Guihe ́neuf, Olivier Bour and LucAquilina; Field Continuous Measurement of Dissolved Gases with a CF-MIMS: Applications to the Physics andBiogeochemistry of Groundwater Flow; Environmental Science & Technology, in press, 2016
Guglielmo di Saint-Thierry: teologo dell’Eucaristia
No full textThe study is about the Eucharistic theology in the work of the medieval Cistercian theologian, William of Saint-Thierry Abbey. First, his general concept of the spirituality of monastic life is presented, which William based on the paradigm of the liturgical celebration which by sign (signum) refers to reality (res). Then, his concept of spiritual communion as inseparably connected with the sacramental communion is discussed. In this part of the study, William’s images appear as important factors for understanding his theology: a spiritual kiss as a way of touching the sacrament mystically, as well as an episode from the monastic life, showing the necessity of receiving the sacrament in a spiritual way so that it can be properly received in a physical one. In the third part of the study, the author attempts to summarize the Eucharistic theology of William of Saint-Thierry, which seems to contrast with the colloquial vision of medieval intellectualism, deprived of mysterious and spiritual elements. Wilhelm z Saint-Thierry: teolog EucharystiiOpracowanie dotyczy teologii eucharystycznej w twórczości średniowiecznego teologa cysterskiego, Wilhelma z opactwa Saint-Thierry. Po omówieniu ogólnej koncepcji duchowości życia monastycznego, którą Wilhelm oparł na paradygmacie celebracji liturgicznej, która przez znak (signum) odsyła do rzeczywistości (res), następuje prezentacja jego koncepcji Komunii duchowej jako nierozerwalnie związanej z Komunią sakramentalną. W tej części studium pojawiają się ważne dla zrozumienia teologii Wilhelma obrazy: pocałunek duchowy jako sposób dotykania sakramentu w sposób mistyczny, a także epizod z życia klasztornego, ukazujący konieczność przyjęcia sakramentu w sposób duchowy, aby móc właściwie przyjąć go na sposób fizyczny. W trzeciej części opracowania autor podejmuje próbę podsumowania teologii eucharystycznej Wilhelma z Saint-Thierry, która okazje się kontrastować z potoczną wizją średniowiecznego intelektualizmu sakramentalnego, wyzbytego pierwiastka misteryjnego i duchowego.
Quantification of conservative and reactive transport using a singlegroundwater tracer test in a fractured media
No full textInternational audiencedentification of biogeochemical reactions in aquifers and determining kinetics is important for the predictionof contaminant transport in aquifers and groundwater management. Therefore, experiments accounting for bothconservative and reactive transport are essential to understand the biogeochemical reactivity at field scale.This study presents the results of a groundwater tracer test using the combined injection of dissolved conservativeand reactive tracers (He, Xe, Ar, Br-, O2and NO3-) in order to evaluate the transport properties of a fracturedmedia in Brittany, France.Dissolved gas concentrations were continuously monitored in situ with a CF-MIMS (Chatton et al, 2016) allowinga high frequency (1 gas every 2 seconds) multi-tracer analysis (N2, O2, CO2, CH4, N2O, H2, He, Ne, Ar, Kr, Xe)over a large resolution (6 orders of magnitude). Along with dissolved gases, groundwater biogeochemistry wasmonitored through the sampling of major anions and cations, trace elements and microbiological diversity.The results show breakthrough curves allowing the combined quantification of conservative and reactive transportproperties. This ongoing work is an original approach investigating the link between heterogeneity of porousmedia and biogeochemical reactions at field scale.Eliot Chatton, Thierry Labasque, Je ́roˆme de La Bernardie, Nicolas Guihe ́neuf, Olivier Bour and LucAquilina; Field Continuous Measurement of Dissolved Gases with a CF-MIMS: Applications to the Physics andBiogeochemistry of Groundwater Flow; Environmental Science & Technology, in press, 2016
Contractual savings institutions and banks'stability and efficiency
No full textThe authors analyze the relationship between the development of contractual savings institutions and banks'efficiency, credit, and liquidity risks. They discuss the potential mechanisms through which the development of contractual savings institutions may affect the banking sector. They show that the development of contractual savings institutions has a significant impact on bank spreads and loan maturity. After controlling for banks'characteristics, macroeconomic factors, and more standard indicators of financial development, they show that the development of contractual savings institutions is associated with increased efficiency of the banking system and greater resilience to credit and liquidity risks.Payment Systems&Infrastructure,Banks&Banking Reform,Economic Theory&Research,Financial Intermediation,Insurance&Risk Mitigation,Contractual Savings,Banks&Banking Reform,Financial Intermediation,Economic Theory&Research,Insurance&Risk Mitigation
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