Dynamic sizing of required balancing capacities: the operational approach in France

System operators employ operating reserves to deal with unexpected variations of demand and generation and guarantee the security of supply. However, they face new challenges to ensure this mission with the increasing share of renewable generation. This article focuses on the operational approach adopted by the French transmission system operator RTE for dynamically sizing the required margins in the dynamic margin monitoring strategy context. It relies on continuous forecasts of the main drivers of the uncertainties of the system imbalance. Four types of forecast errors, assumed to be independent, are considered in this approach: the errors in the wind and photovoltaic power generation, production of conventional power units, and electricity consumption. Then, the required margin is the result of comparing the global forecast error, computed as the convolution of these independent errors, with a security of supply criterion. This study presents the results of this method implemented at RTE and used in real-time operation.Comment: Preprint version of the paper accepted for EEM 23 conferenc

Environmental impact of food waste treatment in an EcoCleaner, a portable accelerated composter

Canteen and catering food wastes represent a challenge in waste management since they contain a large part of water and can be subject to biological processes during the waste management chain, especially during storage. Different solutions exist to manage this organic waste, for instance local and centralized composting, anaerobic digestion, or co-incineration with municipal waste. Except for local composting, theses methods need to collect and transport food waste to be processed, which mean transporting a lot of water. The Life Cycle in Practice (LCiP) (LIFE12 ENV/FR/001113) project helps SMEs to reduce the environmental impacts of their products and services across the entire life cycle. Within the frame of this project, the environmental impact of the Eco-Cleaner system is evaluated with the standardized life cycle assessment (LCA) methodology. Eco-Cleaner (EC) is a stand alone accelerated system that can transform food waste in valuable compost in only 24 hours. It is designed by Biowaste Recycling (http://biowasterecycling.com/). It can be declined in different capacities, from family size (about 1-2 kg/days of food waste) to large communities of 1300 place settings (up to 700 kg/days). EC technology is based on a permanent control of the ratio of humidity and temperature to optimize fermentation rate of food waste by a special consortium of more than thirty thermophilic bacteria. Waste reduction is about 90% and compost is sanitized to ensure the destruction of active parasites, insect eggs and germs. EC compost is dry (80-90% siccity level), and it has a quite high nitrogen content (about 3-4% on dry matter) and is rich in organic matter. Thanks to an activated carbon filter (replaced every two years), it is odourless and has no noxious gas emission. Since it's dry, this compost can be stored without further degradation, and its transport has a reduced environmental cost. The functional unit is the composting of one ton of food waste. The inventory includes the machine itself, its use, its refitting every twelve years, and its end of life. Refurbishing includes mainly the replacement of the motor, the heating resistance, the plastic parts, the seals, and only 5% of metals. Avoided chemical fertilizers consecutive to compost application are considered as system expansion, and it induces negative impact values in all categories. Electricity for use is the main impacting element in all categories (BE mix) but this impact can be reduced by the use of on-site photovoltaic panels. Abiotic depletion is highly impacted due to the metals the EC is made of (92% of total weight, principally steel), but a large improvement is achieved by the quadruplicating of the life span because of refurbishing, and the recycling of metals at the end of life. Specific process data are processed in SimaPro 8.1 software, using Ecoinvent 3.1 database for additional generic data, and analysed with the CML IA 3.03 method

Contribution respective de l'athérosclérose et de la thrombose dans la lésion coupable d'un syndrome coronarien aigu (analyse par échographie endocoronaire)

LYON1-BU Santé (693882101) / SudocPARIS-BIUM (751062103) / SudocSudocFranceF

Analyse du cycle de vie d'un composteur accéléré de déchets alimentaires sur site

Life Cycle in Practive - LCi

Un quartier de frange urbaine à Bourges (Ier s. ap. J.-C. - XXe s.). Les fouilles de la ZAC Avaricum. Volume 1 : Stratification et structures

, . Un quartier de frange urbaine à Bourges (Ier s. ap. J.-C. - XXe s.). Les fouilles de la ZAC Avaricum. Volume 1 : Stratification et structures. Tours : Fédération pour l'édition de la Revue archéologique du Centre de la France, 2013. 496 p. (Supplément à la Revue archéologique du centre de la France, 48

Un quartier de frange urbaine à Bourges (Ier s. ap. J.-C. - XXe s.). Les fouilles de la ZAC Avaricum. Volume 2 : Catalogue du mobilier

, . Un quartier de frange urbaine à Bourges (Ier s. ap. J.-C. - XXe s.). Les fouilles de la ZAC Avaricum. Volume 2 : Catalogue du mobilier. Tours : Fédération pour l'édition de la Revue archéologique du Centre de la France, 2013. 328 p. (Supplément à la Revue archéologique du centre de la France, 48