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University of Technology of Compiègne, France

Komorowski J.-C.,CNRS Paris Institute of Global Physics | Legendre Y.,CNRS Paris Institute of Global Physics | Christopher T.,Montserrat Volcano Observatory | Bernstein M.,State University of New York at Buffalo | And 14 more authors.
Geophysical Research Letters | Year: 2010

During the Soufrire Hills eruption, vulcanian explosions have generally occurred 1) in episodic cycles; 2) isolated during pauses in extrusion, and 3) after major collapses of the dome. In a different eruptive context, significant vulcanian explosions occurred on 29 July 2008, 3 December 2008, and 3 January 2009. Deposits are pumiceous except for the 3 December event. We reconstructed the dispersal pattern of the deposits and their textural characteristics to evaluate erupted volume and vesicularity of the magma at fragmentation. We discuss the implications of these explosions in terms of eruptive processes and chronology, and the hazards posed by their sudden and often unheralded occurrence. We suggest that overpressurization of the conduit can develop over time-scales of months to weeks by a process of self-sealing of conduit walls and/or the cooling dome by silica polymorphs. This work provides new insights for understanding the generation of hazardous vulcanian explosions at andesitic volcanoes. Copyright © 2010 by the American Geophysical Union.

Bigot D.,University of La Runion | Miranville F.,University of La Runion | Boyer H.,University of La Runion | Bojic M.,University of Kragujevac | And 2 more authors.
Energy and Buildings | Year: 2013

This article deals with the optimization and validation of a thermal model of photovoltaic panels integrated to buildings. The PV thermal model is implemented in the building simulation code ISOLAB and have already been the subject of previous works. The optimization is made by using the generic optimization program GenOpt. First, these two programs are presented. Secondly, the case study is presented both experimental and modeling way, and main results of previous work are given. Thirdly, the validation methodology is described. Fourthly, the coupling between ISOLAB and GenOpt is presented, and optimization and validation criteria are given. Finally, results of the experimental optimization are presented and the model is validated. © 2012 Elsevier B.V. All rights reserved.

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