Cost effectiveness of bio-ethanol to reduce carbon dioxide emissions in Greece

The purpose of this study is to evaluate ethanol cost- effectiveness with regards to carbon dioxide emissions. Actually, bio-fuel production is only viable thanks to the tax credit policy resulting in economic ‘deadweight’ loss. The environmental performance is assessed under the Life Cycle Assessment (LCA) framework. Economic burden to society to support the activity divided by avoided CO2 equivalent emissions indicates the bio-ethanol cost effectiveness. Agricultural feedstock supply that comprises of sugarbeets, grains and industrial processing sub-models are articulated in a regional sector model. The maximization of total welfare determines optimal crop mix for farmers and the best configurations for industry. This is illustrated for bio-ethanol produced by the ex-sugar industry in Thessaly, Greece. Life cycle activity analysis showed that, at the optimum, CO2 emission is reduced between 1 and 1.5 t of carbon dioxide equivalent per ton of ethanol. The unitary cost falls in the range of 100 to 250 euro per ton of CO2 and it is remarkably dependent on the agricultural policy scenario.Cost effectiveness, ethanol, mathematical programming, life cycle assessment, greenhouse gases

Photometry of GSC 762-110, a new triple-mode radially pulsating star

Stars pulsating in three radial modes are very rare; only three examples are known in the Galaxy. These stars are very useful since their periods may be measured very precisely, and this will constrain the global stellar parameters and the models of the star's interior. The purpose of this paper is to present a new example of the class of triple-mode radial pulsators. A search for candidate multi-mode pulsators was carried out in public survey data. Time-series photometry of one of the candidates, GSC 762-110, was performed. GSC 762-110 was found to be a triple-mode radial pulsator, with a fundamental period of 0.1945d and period ratios of 0.7641 and 0.8012. In addition two non-radial modes were found, for which the amplitude has diminished considerably over the last few years.Comment: Accepted for publication in Astronomy & Astrophysic

Système multicritère d'aide à la décision pour l'intégration des cultures énergétiques aux systèmes de production de l'énergie en Europe du Sud

Diffusion du document : INRA Unité Mixte de Recherche INRA-INA PG Economie publique INA Paris Grignon BP 1 78850 Thiverval-Grignon (FRA)International audienceUn modèle multicritère pour l'évaluation des filières intégrées de biomasse énergétique les plus prometteuses au niveau régional en Europe du Sud est développé, en tant qu'outil d'aide à la décision des décideurs publics, des investisseurs et des exploitants agricoles. Le bouclage des bases d'information provenant d'un système d'information géographique et des bases de données statistiques régionales aux modèles intégrés micro-économiques de filière a été effectué. La décision peut être le compromis entre plusieurs critères, économiques, sociaux et environnementaux