Search results for "Energy engineering"
showing 10 items of 1099 documents
Editorial
2015
Patrick Baudry, La place des morts. Enjeux et rites. Paris, Armand Colin, Collection Chemins de traverse (dirigée par David Le Breton), 1999, 205 p.,…
2002
Editorial
2013
Développement d'un nouveau capteur de gaz basé sur la détection à large bande micro-onde
2007
Resume Nous presentons une methode originale de detection des gaz. Notre capteur se compose d'un materiau sensible introduit dans une structure coaxiale. Un champ electromagnetique (micro-ondes), emis a travers le capteur par un analyseur de reseaux vectoriel, sollicite le materiau sensible soumis a un gaz. La variation de la reponse du capteur observee est due aux variations des proprietes dielectriques du materiau sensible induite par l'adsorption du gaz. L'etude fait apparaitre que le capteur a base d'oxyde SrTiO3 est quantitatif et selectif pour trois gaz differents (eau, ethanol, toluene). Pour citer cet article : J. Jouhannaud et al., C. R. Physique 8 (2007).
Open Educational Resources in virtual teaching communities
2021
Los modelos formativos ligados a la teoría del conectivismo son cada vez más flexibles, abiertos y participativos. Bajo esta tendencia, se han expandido ideas como las comunidades virtuales docentes (CVD) y los recursos educativos abiertos (REA), que plantean oportunidades educativas en línea. El presente trabajo buscó conocer y analizar los usos y las potencialidades que tienen los recursos educativos de libre acceso en una CVD; además, se examinó el significado que los miembros de esa comunidad dan a los REA. Para esto, se recurrió a un procedimiento cualitativo de investigación que permitió la elaboración y la validación interjueces de dos instrumentos de recolección de datos: una entrev…
GIS-data related route optimization, hierarchical clustering, location optimization, and kernel density methods are useful for promoting distributed …
2019
Currently, geographic information system (GIS) models are popular for studying location-allocation-related questions concerning bioenergy plants. The aim of this study was to develop a model to investigate optimal locations for two different types of bioenergy plants, for farm and centralized biogas plants, and for wood terminals in rural areas based on minimizing transportation distances. The optimal locations of biogas plants were determined using location optimization tools in R software, and the optimal locations of wood terminals were determined using kernel density tools in ArcGIS. The present case study showed that the utilized GIS tools are useful for bioenergy-related decision-maki…
Estimating the Effect of Common Currencies on Trade: Blooming or Withering Roses?
2013
Abstract Using a gravity model and data on 182 countries worldwide, this paper estimates the effects of exchange rate volatility and currency unions on international trade for ten years spanning 1980 through 2010. We provide added confirmation and further strengthen the empirical findings in Rose (2000) prior to 1999, but we find a gradually diminishing Rose effect for the 2000-2010 period, when the Euro Zone is added to the currency union dummy. The rest of the coefficients generally comply in magnitude and sign with what is standard in the “gravity” literature. Our findings support a much stronger effect of a currency union on trade than the hypothetical effect of reducing exchange rate v…
Extraction of thermal characteristics of surrounding geological layers of a geothermal heat exchanger by 3D numerical simulations
2016
Ground thermal conductivity and borehole thermal resistance are key parameters for the design of closed Ground-Source Heat Pump (GSHP) systems. The standard method to determine these parameters is the Thermal Response Test (TRT). This test analyses the ground thermal response to a constant heat power injection or extraction by measuring inlet and outlet temperatures of the fluid at the top of the borehole heat exchanger. These data are commonly evaluated by models considering the ground being homogeneous and isotropic. This approach estimates an effective ground thermal conductivity representing an average of the thermal conductivity of the different layers crossed by perforation. In order …
Efficiency improvement of a ground coupled heat pump system from energy management
2011
The installed capacity of an air conditioning system is usually higher than the average cooling or heating demand along the year. So, most of the time, the system is working under its actual capacity. In this contribution, we study the way to improve the efficiency of a ground coupled heat pump air conditioning system by adapting its produced thermal energy to the actual thermal demand. For this purpose, an air conditioning system composed by a ground coupled heat pump and a central fan coil linked to an office located in a cooling dominated area was simulated, and a new management strategy aiming to diminish electrical consumption was developed under the basic constraint that comfort requi…
Economical Issues Regarding the Implementation and Functioning of the Common Catalogue of Varieties of Agricultural Plant Species
2013
Abstract Economical constraints regarding the full implementation and functioning of the common catalogue on plant genetic resources for food and agriculture (PGEFA) are discussed in this paper based on the assessment of the current European Union regulatory framework. Based on this article's results new financial mechanisms should be developed at the national level for further responding to the European requirements including measures regarding the conservation varieties. This assessment is further supporting the need for developing and implementing new financial mechanisms in the support of the poor rural populations as well as for small farmers in harmony with commercial agriculture.