8 results on '"Ruf H"'
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2. Simulation of Local Energy Surplus Usage in Hybrid Grids with a High PV Penetration Rate
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Stakic, D., Ruf, H., Ditz, K., Funk, D., Heilscher, G., and Meier, F.
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Grid and Energy System Integration ,PV Applications and Integration - Abstract
32nd European Photovoltaic Solar Energy Conference and Exhibition; 2423-2426, The objective of the “optimizing hybrid energy grids for smart cities”- (OrPHEuS) project is the development of cooperative control strategies for smart cities and hybrid energy networks. The OrPHEuS project aims at solutions for optimizing the interaction among multiple energy grids e.g. electric power, district heating and gas, which are connected through coupling points and defined as hybrid energy grids. This paper focus on the framework developed for the situation in the two test areas close to the city of Ulm, Southern Germany. The test areas have suburban and village character with high photovoltaic penetration rate. The interaction of the key values of the heat, gas and electrical demand has been investigated. As a result the most promising configuration for the control strategies was set-up. As a part of the preprocessing for the co-simulation of the energy grids the potential storage capacity within the gas grid was calculated.
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- 2016
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3. The Relevance of PV in the Optimisation of Synergies Among Hybrid Energy Grids in Smart Cities – the OrPHEuS Project
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Caneva, S., Weiss, I., Betz, S., Challet, S., Heilscher, G., Ruf, H., Stakic, D., Ditz, K., Funk, D., Meier, F., Schülke, A., Noh, T.G., Papageorgiou, A., and Nicolas, S.
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PV Economics, Markets and Policies ,PV Global Issues, Policies and Strategies - Abstract
32nd European Photovoltaic Solar Energy Conference and Exhibition; 2866-2868, At present, energy grids (electricity, heating/cooling, gas) still mainly operate independently and do not make use of synergies between them. Although interactions and synergies are increasingly apparent, they neither have been comprehensively analysed nor implemented in practise. The optimisation of such synergies is under investigation in the OrPHEuS project, which has the aim of improving the cooperation among energy grids enabling, at the same time, high renewable resources penetration and customer satisfaction. Overall, the technology innovation of the OrPHEuS project is related to the provisioning of a cross-domain multi-utility energy management system. The system targets an increase of efficiency for renewable energy generation and minimizes the overall energy demand and CO2 emissions in smart cities by exploiting a higher level of Information and Communication Technologies (ICT) in all energy systems.
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- 2016
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4. Simulation of the Load Flow at the Transformer in Low Voltage Distribution Grids with a Significant Number of PV Systems Using Satellite-Derived Solar Irradiance
- Author
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Ruf, H., Schroedter-Homscheidt, M., Beyer, H.G., and Heilscher, G.
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Grid and Energy System Integration ,PV Applications and Integration - Abstract
32nd European Photovoltaic Solar Energy Conference and Exhibition; 2653-2658, A scheme using satellite-derived irradiance measurements to model the load flow of a medium-to-low voltage transformer in a low voltage distribution grid area is described. This scheme is validated with measurements at the transformer from a test site with 21 residential PV systems in the city of Ulm, Germany. The irradiance data are provided by the SOLEMI, the Helioclim-3 and the CAMS Radiation Service. The load flow simulation model is based on a PV model taking into account nominal power and location of the PV systems as provided by the distribution system operator and orientation angles taken in high resolution from aerial laser-scan data. The load data are assumed using load profile time series from standard load profiles and measured profiles. Modell quality is assessed by a comparison of modelled and measured power. Average mean errors of power are found in the range of 14.0 % to 16.6 % and the RMSE is between 41.1 % and 42.3 % for the different input data sources. Overall, the study indicates the usefulness and applicability of satellite-derived irradiance data for utility applications like load flow monitoring of transformers in areas with a high amount of residential PV systems.
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- 2016
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5. Validation of Satellite Based Solar Irradiance According to the Heliosat-4-Method for Germany
- Author
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Ditz, K., Ruf, H., Funk, D., Schroedter-Homscheidt, M., Köhler, C., and Heilscher, G.
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Operation, Performance, Reliability and Sustainability of Photovoltaics ,Solar Resource and Forecasting - Abstract
32nd European Photovoltaic Solar Energy Conference and Exhibition; 2312-2317, The continuing growing number of volatile feed-in systems, e.g. photovoltaic (PV) systems in the low voltage grid, leads to essential changes of the grid planning and operation. For this reason the distribution grid operators will need independent switching operation in the future [1]. Therefore, the DSO is interested in knowing the actual PV feed-in power. The most detailed solution is to equip all PV systems with Smart Meters to measure the actual feed-in power. However, this solution causes additional costs for installation, service and operation. Though it’s only possible to react on the volatile Feed-in power of the PV systems which could lead to high costs for control power or for the curtailment of PV systems [2]. The solar irradiance is the most important input parameter for the PV simulation. A solution without ground-based measurements is the usage of calculated solar irradiance from satellite pictures. Therefore, some providers, like Helioclim, CM SAF, OSI SAF or the new developed CAMS Radiation Service, based on the Heliosat-4-method, are available [3]. This paper focus on the validation of the solar irradiance calculated with the Heliosat-4-method provided by CAMS Radiation Service.
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- 2016
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6. Outcome after Thrombectomy and Intravenous Thrombolysis in Patients with Acute Ischemic Stroke: A Prospective Observational Study
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Projectafdeling functional imaging, MS VPG/Gynaecologie, Brain, Circulatory Health, Child Health, Minnerup, Jens, Wersching, Heike, Teuber, Anja, Wellmann, Jürgen, Eyding, Jens, Weber, Ralph, Reimann, Gernot, Weber, Werner, Krause, Lars Udo, Kurth, Tobias, Berger, Klaus, Homberg, V., Petrovitch, A., Heuser, L., Mönnigs, P., Krogias, C., Wallner, B., Hennigs, S., Ahlers, A., Sahl, H., Ranft, A., Dobis, C., Brassel, F., Nolden-Koch, M., Schmitt, H., Chapot, R., Nordmeyer, H., Schlamann, M., Weimar, C., Busch, F., Busch, E. W., Sigges, E., Ruf, H., Wohlfahrt, K., Karatschai, R., Klein, B., Höhle, T., Haass, A., Nasreldein, A., Büchele, B., Gahn, G., Sterker, M., Hantel, T., Krämer, C., Henningsen, H., Adelt, I., König, M., Schmidt, C., Hofmann, A., Niederstadt, T., Unrath, M., Rehfeldt, T., Fauser, B., Pfeiffer, A., Lowens, S., Stögbauer, F., Staudacher, T., Erdmann, P., Grotemeyer, K. H., Spüntrup, E., Bücke, P., Wienecke, P., Faiss, J., Wolzik-Großmann, M., Brune, N., Isenmann, S., Thomas, C., Mucha, D., Projectafdeling functional imaging, MS VPG/Gynaecologie, Brain, Circulatory Health, Child Health, Minnerup, Jens, Wersching, Heike, Teuber, Anja, Wellmann, Jürgen, Eyding, Jens, Weber, Ralph, Reimann, Gernot, Weber, Werner, Krause, Lars Udo, Kurth, Tobias, Berger, Klaus, Homberg, V., Petrovitch, A., Heuser, L., Mönnigs, P., Krogias, C., Wallner, B., Hennigs, S., Ahlers, A., Sahl, H., Ranft, A., Dobis, C., Brassel, F., Nolden-Koch, M., Schmitt, H., Chapot, R., Nordmeyer, H., Schlamann, M., Weimar, C., Busch, F., Busch, E. W., Sigges, E., Ruf, H., Wohlfahrt, K., Karatschai, R., Klein, B., Höhle, T., Haass, A., Nasreldein, A., Büchele, B., Gahn, G., Sterker, M., Hantel, T., Krämer, C., Henningsen, H., Adelt, I., König, M., Schmidt, C., Hofmann, A., Niederstadt, T., Unrath, M., Rehfeldt, T., Fauser, B., Pfeiffer, A., Lowens, S., Stögbauer, F., Staudacher, T., Erdmann, P., Grotemeyer, K. H., Spüntrup, E., Bücke, P., Wienecke, P., Faiss, J., Wolzik-Großmann, M., Brune, N., Isenmann, S., Thomas, C., and Mucha, D.
- Published
- 2016
7. Probing molecular chirality on a sub-femtosecond timescale
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Cireasa, R., primary, Boguslavskiy, A. E., additional, Pons, B., additional, Wong, M. C. H., additional, Descamps, D., additional, Petit, S., additional, Ruf, H., additional, Thiré, N., additional, Ferré, A., additional, Suarez, J., additional, Higuet, J., additional, Schmidt, B. E., additional, Alharbi, A. F., additional, Légaré, F., additional, Blanchet, V., additional, Fabre, B., additional, Patchkovskii, S., additional, Smirnova, O., additional, Mairesse, Y., additional, and Bhardwaj, V. R., additional
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- 2015
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8. Sleep of Nurses: A Comprehensive Scoping Review.
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Matricciani L, Clarke J, Wiley S, Williams A, Baljak GR, Graham K, Gum L, Rogers M, Howland K, Stewart K, Ruf H, Marnie C, Visvanathan V, Singh B, Banks S, Kelly MA, and Peters MDJ
- Abstract
Aim: To map the extent, range and nature of studies that examine sleep of nurses and identify how sleep has been examined in relation to the different aspects of nurses' health and nursing work and practice., Design: A scoping review., Data Sources: A search of five electronic databases including MEDLINE, Embase, EMcare, PsycINFO (using the Ovid platform) and Scopus was undertaken in May 2023 to identify primary studies that examined nurses' sleep., Review Methods: This review was undertaken in accordance with the Joanna Briggs Institute methodology for scoping reviews and reported in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses extension for Scoping Reviews (PRISMA-ScR) Checklist., Results: This review included 1040 studies from a wide range of countries. Most studies were observational in design and examined nurses working in the acute care sector. Studies were mostly descriptive (32%) or discussed sleep as a workforce issue (21%) or lifestyle behaviour that is important for the health of nurses working clinically (27%). A range of different sleep parameters were examined, with sleep quality the focus of most studies, especially in relation to well-being., Conclusion: There has been an exponential increase in the number of studies that examine nurses' sleep. Efforts to examine the sleep of nurses are beginning to align with contemporary understandings and methodological approaches to examining sleep. However, this field of research could benefit from better consistency in the definition and reporting of sleep, prioritising objective measures of sleep and improving understanding of the relative and combined importance of different dimensions of sleep., Impact: This review provides a comprehensive overview of studies that examine nurses' sleep. Findings highlight areas of growing interest, areas in need of further research and methodological considerations to strengthen research in this field., Patient or Public Contribution: No patient or public contribution. REGISTRATION DOI: https://doi.org/10.17605/OSF.IO/RZC4M., (© 2024 John Wiley & Sons Ltd.)
- Published
- 2024
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