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Ales, France

L'École des Mines d'Alès was created in 1843 by King Louis XVI, under the guardianship of the French Ministry of Economy, Finance and Employment, is a French technology and engineering university. From 2012, its full name changed into Ecole Nationale Supérieure des Mines d'Alès Wikipedia.

Rafiee A.,University of Zanjan | Vinches M.,Ecole des Mines dAles
Engineering Structures | Year: 2013

The aim of this study is to investigate the effect of different types of static loadings on the mechanical behaviour of a standard arch bridge and a masonry stone bridge in real scale. The mechanical analyses are performed using the Non-Smooth Contact Dynamic method (NSCD) known as an implicit discrete element method. After a brief description of the NSCD method, the stability state analysis is carried out over a classic stone arch in order to demonstrate the efficiency of this numerical method to reveal the diverse collapse mechanisms happening in the masonry structures under several static loading conditions. For the analysis of a real masonry structure, the roman stone bridge of the Pont Julien in Vaucluse (South of France) is studied, based on site measurements, under an academic loading, to show the capacity of the method to take into account heterogeneous loading patterns. © 2012 Elsevier Ltd.

De Windt L.,MINES ParisTech | Devillers P.,Ecole des Mines dAles
Cement and Concrete Research | Year: 2010

Reactive transport models can be used to assess the long-term performance of cement-based materials subjected to biodegradation. A bioleaching test (with Aspergillus niger fungi) applied to ordinary Portland cement pastes during 15 months is modeled with HYTEC. Modeling indicates that the biogenic organic acids (acetic, butyric, lactic and oxalic) strongly accelerate hydrate dissolution by acidic hydrolysis whilst their complexation of aluminum has an effect on the secondary gel stability only. The deepest degradation front corresponds to portlandite dissolution and decalcification of calcium silicate hydrates. A complex pattern of sulfate phases dissolution and precipitation takes place in an intermediate zone. The outermost degraded zone consists of alumina and silica gels. The modeling accurateness of calcium leaching, pH evolution and degradation thickness is consistently enhanced whilst considering increase of diffusivity in the degraded zones. Precipitation of calcium oxalate is predicted by modeling but was hindered in the bioleaching reactor. © 2010 Elsevier Ltd. All rights reserved.

Guillot J.-M.,Ecole des Mines dAles
Chemical Engineering Transactions | Year: 2012

Odour and odorous compound measurements depend on the first analytical step: the sampling. This first step could be considered as the most important because the global results are dependent on sampling and analytical procedures but the second part (analysis) is globally more controlled. As example, olfactometric measurement procedures are well described by EN 13725 standard. But, if panel selection and all smelling parts allow limiting uncertainty for the dilution to threshold measurement, the sampling part is not as well described. Because of several approaches on sampling especially sampling from area sources, a lot of variations can be obtained by this step. Typically, several experiments on area sources have shown that a factor 10, 100 or more can be attributed to the sampling step. In such a case, the uncertainty of the olfactometric part is negligible comparatively to the sampling part. That's why, it is important to keep in mind that hoods or flux chambers as devices to sample on an active or a passive area respectively must be considered with strict procedures. Even if a lot of teams follow rigorously their own procedure or a regional or a national standard, the lack of international standard on this point is still a problem. Some results cannot be compared with others due to great differences on sampling. The problem could be increased by the sample collection and storage in bags. A lot of studies showed that storage of some compounds or odours are very problematic (losses) and therefore can lead to wrong results. Of course, limitation of time storage can minimize such an impact but it's important to consider this potential problem by taking some warranties. The present paper gives an overview on the main drawbacks linked to sampling and that affect the global response of odour measurement. Copyright © 2012, AIDIC Servizi S.r.l.

Elwakeel K.Z.,Port Said University | Atia A.A.,Menoufia University | Guibal E.,Ecole des Mines dAles
Bioresource Technology | Year: 2014

Chitosan was cross-linked using glutaraldehyde in the presence of magnetite. The resin was chemically modified through the reaction with tetraethylenepentamine (TEPA) to produce amine bearing chitosan. The resin showed a higher affinity towards the uptake of UO22+ ions from aqueous medium: maximum sorption capacity reached 1.8mmolg-1 at pH 4 and 25°C. The nature of interaction of UO22+ ions with the resin was identified. Kinetics were carried out at different temperatures and thermodynamic parameters were evaluated. Breakthrough curves for the removal of UO22+ were studied at different flow rates, bed heights and after 3 regeneration cycles. Hydrochloric acid (0.5M) was used for desorbing UO22+ from loaded resin: desorption yield as high as 98% was obtained. © 2014 Elsevier Ltd.

Agency: Cordis | Branch: H2020 | Program: MSCA-RISE | Phase: MSCA-RISE-2015 | Award Amount: 873.00K | Year: 2015

The HUNTER project will develop revolutionary power devices that convert humidity into electrical charge (hygroelectricity), thereby contributing to the European technology and creativity through joint R&D and R&I multisectorial and international cooperation activities supported by knowledge sharing. The devices will harvest electricity from atmospheric humidity and supply a current, such as solar cells capture sunlight and generate electrical power. The successful realization of the project is assured by implementing a coordinated network of knowledge sharing in materials science, physics and chemistry; by solidifying the state-of-the-art understanding in nanoelectronics and by applying bottom-up nanoengineering approaches via an international and inter-sector collaboration of highly qualified researchers from Portugal, France, Finland, Ukraine, Belarus and USA. Both technological (nanoelectronic device fabrication) and fundamental (charge transport mechanisms) issues will be assessed by this multidisciplinary consortium. The successful realization of this project will lead to scientifically substantiated principles for the development of a new generation of functional materials and, consequently, to the creation of advanced nanoelectronic devices. Within the HUNTER project, the consortium will implement research/innovation activities by means of functional secondments and organizing training courses, workshops and summer schools aimed at sharing knowledge, acquiring new skills and developing the careers of the consortium members. Sharing the culture of research and innovation, the HUNTER project will allow applying recent advancements in nanotechnology and materials science to the realization of the creative idea of Nikola Tesla (1932) of capturing electricity from the air. This vision will be performed in practice by innovative humidity-to-electricity devices, which will enhance the range of known renewable energy sources by a new atmospheric humidity source.

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