| 1. |
- Chulkov, L. V., et al.
(författare)
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Three-body correlations in electromagnetic dissociation of Borromean nuclei: The He-6 case
- 2005
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Ingår i: Nuclear Physics A. - : Elsevier BV. - 0375-9474. ; 759:1-2, s. 23-42
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Tidskriftsartikel (refereegranskat)abstract
- Dissociation of He-6 on a lead target has been studied at 240 MeV/u. The four-momenta of the two neutrons in coincidence with alpha-particles have been measured and used to reconstruct the three-body energy and angular correlations in the final state. For the first time, three-body correlations were included in the analysis of the He-6 dissociation data, and compared with calculations assuming a dipole mode for the electromagnetic dissociation. In addition, the experimental data have been analyzed using a series expansion of the final transition amplitude into hyperspherical functions, showing the importance of both nn and alpha n final-state interactions. It is shown that the dissociation process is governed by a transition of one neutron from the p-shell in the 6He ground state to the s-shell in the continuum further indicating that the role of the transition through an intermediate He-5(3/2(-)) state is more important than expected. (c) 2005 Elsevier B.V. All rights reserved.
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| 2. |
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| 3. |
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| 4. |
- Simon, H., et al.
(författare)
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Systematic investigation of the drip-line nuclei 11Li and 14Be and their unbound subsystems 10Li and 13Be
- 2007
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Ingår i: Nuclear Physics A. - : Elsevier BV. - 0375-9474. ; 791:3-4, s. 267-
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Tidskriftsartikel (refereegranskat)abstract
- Fragmentation reactions in a carbon target with beams of 11Li and 14Be at relativistic energies have been studied in a kinematically complete experiment at the ALADIN-LAND setup at GSI. Excited states in 11Li and 14Be were obtained from the data in the inelastic channel. The measured cross sections with the core nucleus in the final state show that in the 14Be case core polarization plays an important role. In the one-neutron knockout channels the measured angular correlations between fragment and neutron are asymmetric, which demonstrates the presence of states with different parities in the 11Li and 14Be ground states. For 10Li a low-lying virtual s-state, a p-state and evidence for a d-state could be extracted from the data, while the 12Be+n system shows resonances with more complicated structure.
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| 5. |
- Barthel, Roland, 1967, et al.
(författare)
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Linking the physical and the socio-economic compartments of an integrated water and land use management model on a river basin scale using an object-oriented water supply model
- 2005
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Ingår i: Physics and Chemistry of the Earth. - : Elsevier BV. - 1474-7065. ; 30:6-7, s. 389-397
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Tidskriftsartikel (refereegranskat)abstract
- Within the framework of the research project 'GLOWA-Danube', a model of the water supply sector has been developed. GLOWA-Danube investigates long-term changes in the water cycle of the Upper Danube river basin in light of global change. For this purpose, the decision support system DANUBIA, comprising 15 fully coupled models, has been developed. Within DANUBIA the water supply model ('WaterSupply') forms the link between various physical models determining water quality and availability and several socio-economic models determining water consumption and demand. Having a central focus on public drinking water supply, its purpose is to correctly simulate the present day system of water extraction and distribution and the related costs, but also to allow meaningful response to possible future changes of boundary conditions, first and foremost changes in water demand or water availability and quality. Response mechanisms are also envisioned for changes in political and economic boundary conditions, and advances in technology. The model will be used locate critical regions which could experience water stress in the future, but does not aim to find the appropriate solutions or to predict the optimal organisation of water supply in the Danube Basin under such changing conditions. In the object-oriented model structure, both water supply companies (WSC) and communities are represented by main classes. Both classes have a limited view and knowledge of their environment. A community knows where and how much water is consumed and from which WSC it is served. A WSC possesses information regarding extraction sites and water rights, raw water quality and potential collaborating WSC. The WSC can perform actions that are different from 'business as usual'. These deviations from their usual behaviour can be interpreted by decision makers but should not be regarded as a replacement for the decision-making process itself. The model is conceptualised using object-oriented concepts of the Unified Modelling Language (UML) and is implemented in JAVA. This short overview is meant to answer key questions such as why and how WaterSupply was implemented, what is unique and new about the model and what are the general lessons learned and the added value with regard to integrated modelling on a river basin scale. It is obvious that in the attempt to answer these questions it is not possible to satisfy experts from all the relevant related fields, which include computer sciences, economy, behavioural science and not least water supply engineering and hydrology. (c) 2005 Elsevier Ltd. All rights reserved.
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| 6. |
- Nickel, D., et al.
(författare)
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Large-scale water resources management within the framework of GLOWA-Danube - The water supply model
- 2005
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Ingår i: Physics and Chemistry of the Earth. - : Elsevier BV. - 1474-7065. ; 30:6-7 SPEC. ISS., s. 383-388
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Tidskriftsartikel (refereegranskat)abstract
- The research project GLOWA-Danube, financed by the German Federal Government, investigates long-term changes in the water cycle of the upper Danube river basin in light of global climatic change. Its aim is to build a fully integrated decision support tool "DANUBIA" that combines the competence of eleven institutes in domains covering all major aspects governing the water cycle. The research group "Groundwater and Water Supply" at the Institute of Hydraulic Engineering (IWS), Universitaet Stuttgart, contributes a three-dimensional groundwater flow model and a large-scale water supply model which simulate both water availability and quality and water supply and the related costs for global change scenarios. This article addresses the task of creating an agent-based model of the water supply sector. The water supply model links the various physical models determining water quality and availability on the one hand and the socalled "Actor" models calculating water demand on the other by determining the actual water supply and the costs related, which underlie both technical and physical constraints (e.g., existing infrastructure and its capacity, water availability and quality, geology, elevation, etc.). In reality, water supply within the study is organised through a three-tiered structure: long-distance, regional, and a multitude of community-based suppliers. In order to model this system in which each supply company defines its own optimum, an agent-based modelling approach (implemented using JAVA) was chosen. This approach is novel to modelling water supply in that not only water supply infrastructure but more importantly the decision makers (communities, water supply companies) are represented as generalised objects, capable of performing actions following rules that are determined by the class they belong to. © 2005 Elsevier Ltd. All rights reserved.
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