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Meunier F.,Laboratoire Of Genie Des Procedes Pour Lenvironnement | Reis A.H.,University of Évora
Journal of Atmospheric and Solar-Terrestrial Physics | Year: 2015

The conclusion by Soon and Legates (2013) that "increase in solar radiation has caused an increase in both oceanic and atmospheric heat transport to the Arctic in the warm period since the 1970s, resulting in a reduced temperature gradient between the Equator and the Arctic", is discussed, and a different explanation of the results is proposed here. © 2015 Elsevier Ltd.

Rabesiaka M.,Laboratoire Of Genie Des Procedes Pour Lenvironnement | Sghaier M.,Laboratoire Materiaux et Sante | Fraisse B.,Charles Gerhardt Institute | Porte C.,Laboratoire Of Genie Des Procedes Pour Lenvironnement | And 2 more authors.
Journal of Crystal Growth | Year: 2010

This study shows that it is possible to obtain pure α-glycine or a mixture of glycine polymorphs (α and γ) in aqueous solution, depending on the mode of preparation, either continuous or semi-continuous. The differences between the two samples of glycine in solid state and in aqueous solution have been studied, using the following techniques: X-ray analysis, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), thermal microscopy, calorimetric analysis, thermally stimulated current (TSC) analysis and electrochemical impedance analysis. These analyses show that the presence of γ-glycine significantly modifies the physico-chemical properties of these two samples. © 2010 Elsevier B.V. All rights reserved.

Lacour S.,IRSTEA | Chinese T.,IRSTEA | Alkadee D.,Laboratoire Of Genie Des Procedes Pour Lenvironnement | Perilhon C.,Laboratoire Of Genie Des Procedes Pour Lenvironnement | Descombes G.,Laboratoire Of Genie Des Procedes Pour Lenvironnement
Renewable and Sustainable Energy Reviews | Year: 2012

Considerable research is currently being devoted to seeking alternative fuels to comply with transportation needs while reducing the environmental impact of this sector. Within the transport activity sector, on road vehicles and agricultural machinery require around 2 Mtoe energy in France. The anaerobic digestion of farm waste could roughly cover these needs. This paper aims to study the environmental and energy interest of this short power supply path. An ideal biogas production system has been built up from the average characteristics of current rural biogas plants in France. Pollutant emissions, energy demands and production are assessed for various scenarios in order to produce methane for dual fuel engines. Life cycle assessment (LCA) is used to evaluate the environmental impact of dual fuel agricultural machines, compared to diesel engines. The energy balance is always in disfavour of biogas fuel, whereas LCA energy indicators indicate a benefit for biogas production. This gap is related to the way in which the input of biomass energy is handled: in conventional biofuel LCA, this energy is not taken into account. A carbon balance is then presented to discuss the impact of biogas on climate change. Dual fuel engines were found to be interesting for their small impact. We also show, however, how the biogenic carbon assumption and the choice of allocation for the avoided methane emissions of anaerobic digestion are crucial in quantifying CO 2 savings. Other environmental issues of biogas fuel were examined. Results indicate that are management and green electricity are the key points for a sustainable biogas fuel. It is concluded that biofuel environmental damage is reduced if energy needs during biofuel production are covered by the production process itself. As agricultural equipment is used during the biofuel production process, this implies that a high substitution rate should be used for this equipment. © 2011 Elsevier Ltd. All rights reserved.

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