Processing GPS measurements during periods of high ionospheric activity

in Proceedings of EUREF 2002 Symposium (2003)

Processing of carbon fibers reinforced Mg matrix composites via pre-infiltration with Al

Conference (2011, September)

Mg matrix composites appear as suitable competitors to Al alloys for a wide number of applications, as they allow for a significant weight reduction while exhibiting potentially comparable mechanical ... [more ▼]

Mg matrix composites appear as suitable competitors to Al alloys for a wide number of applications, as they allow for a significant weight reduction while exhibiting potentially comparable mechanical properties. And a large variety of processing routes have already been considered for their production, including 'liquid state' processes such as squeeze casting. These techniques necessitate a very careful control of the wetting behaviour and of the possible interfacial reactions between the reinforcements and the molten metal, along with the solidification process. And this is more particularly true in the case of Mg matrix composites with carbon fibers reinforcements, as Mg alloys are known to exhibit a poor wetting behaviour on carbon substrates. [less ▲]

Processing of Ti alloys by additive manufacturing: a comparison of the microstructures obtained by laser cladding, selective laser melting and electron beam melting

in Materials Science Forum (2013)

Additive manufacturing processes such as laser cladding (LC) or selective laser melting (SLM) appear very promising in view of an economic near-net-shape production – and also, in the case of LC, the ... [more ▼]

Additive manufacturing processes such as laser cladding (LC) or selective laser melting (SLM) appear very promising in view of an economic near-net-shape production – and also, in the case of LC, the restoration - of complex and (almost) fully dense parts from Ti alloys. Both techniques involve the melting of a metallic powder with a laser. In the SLM process, the metallic powder is deposited layer by layer in a powder bed and then molten locally according to the desired shape, whereas in LC, the metallic powder is directly projected onto a substrate through a nozzle coaxial with the laser beam. The present research aims at comparing Ti-6Al-4V samples processed by these two techniques with reference samples produced by electron beam melting (EBM), another well established additive manufacturing process (patented by Arcam AB Company) in which a powder bed is molten locally by means of an electron beam. In all three processes, the melt pool undergoes an ultrafast cooling and solidifies very rapidly once the beam has left the area, thus giving rise to strongly out-of-equilibrium microstructures. Yet, each one of these processes also has its own specificities e.g. in terms of scanning strategy and of working atmosphere (low vacuum vs. protective Ar flow). In the present work, the microstructures obtained by these three processes have been compared in details, with a particular attention for characteristics such as porosity, grain size, and the various phases present. Since epitaxial growth of the newly deposited layer on the material previously solidified has been shown [1, 2] to exert a strong influence on the microstructure and on the resulting mechanical properties, great care has been taken to study the microstructural anisotropy associated with each one of the three processes. [less ▲]

Processing samples of benthic marine diatoms from Mediterranean oligotrophic areas

in Journal of Applied Phycology (2012), 24

The processing of benthic diatoms is tedious and involves several potentially damaging steps for cells. Although the preservation of siliceous frustules is of paramount importance in the implementation of ... [more ▼]

The processing of benthic diatoms is tedious and involves several potentially damaging steps for cells. Although the preservation of siliceous frustules is of paramount importance in the implementation of biotic indices, only few studies quantified treatment-induced cell losses. We assumed that commonly used treatments may lead to mechanical (centrifugation, sedimentation, boiling, sonication and mounting in Naphrax) and chemical (cold H2O2 digestion) damages on diatoms. We analysed the potential adverse effects of these treatments and the cleaning efficiency of H2O2 and incineration in order to find out the most suitable technique to process lightly silicified Mediterranean populations. Results showed that successive resuspensions of material after each concentration treatment (sedimentation and centrifugation) and low speed centrifugation did not alter the physical integrity of frustules. In contrast, boiling and sonication exhibited adverse effects especially on the preservation of large frustules and Naphrax mounting proved to be the most damaging step whatever the size of diatoms. For cleaning treatments, incineration provided the most satisfactory results and acted on a non-selective way as opposed to hydrogen peroxide which led to either a large number of non-cleaned frustules or dissolved valves. Our recommendations for processing samples of lightly silicified Mediterranean benthic diatoms include the use of low speed centrifugations, dehydration at room temperature, incineration and dry mounting. [less ▲]

La procession dansante d'Echternach

in Revue Générale : Religion, Politique, Histoire (1876), XXIV

Les processions de l’Europe baroque : définition, typologie et enjeux

Scientific conference (2009, March 27)

Processos a políticas (locais) de integração : estado do conhecimento e ilações

in Marques, Margarida (Ed.) Estado-Nação e Migrações Internacionais (2010)

Processus attentionnels et maladie d'Alzheimer

in Couillet, J.; Leclerq, M.; Moroni, C. (Eds.) et al La neuropsychologie de l'attention (2002)

La maladie d'Alzheimer se caractérise par l'accumulation progressive de déficits affectant différents domaines cognitifs.(...)Il est maintenant largement reconnu que la maladie d'Alzheimer n'affecte pas ... [more ▼]

La maladie d'Alzheimer se caractérise par l'accumulation progressive de déficits affectant différents domaines cognitifs.(...)Il est maintenant largement reconnu que la maladie d'Alzheimer n'affecte pas tous les processus cognitifs de façon équivalente.(...)Les modèles cognitifs de l'attention suggèrent que l'attention n'est pas un système homogène et que différents types de processus attentionnels peuvent être distingués.(...)Le but de ce chapitre est de présenter les travaux les plus représentatifs ayant exploré ces différents types de processus dans la maladie d'Alzheimer. [less ▲]

Les processus climatologiques intervenant dans le bilan hydrologique de petits bassins versants boisés

in Les Ecosystèmes Forestiers en Wallonie (1983)

Processus d'aménagement et des gestion des espaces publics

in Tableau de bord "Participation et espaces publics" - Pour un développement et une gestion concertée des espaces publics (2010)

La recherche-action TOPOZYM a produit un tableau de bord qui est un outil au service des personnes qui sont des vecteurs de changement de comportement des acteurs de l’espace (animateurs territoriaux ... [more ▼]

La recherche-action TOPOZYM a produit un tableau de bord qui est un outil au service des personnes qui sont des vecteurs de changement de comportement des acteurs de l’espace (animateurs territoriaux, médias, secteur éducatif, agents de développement local,...) dans une perspective d’une meilleure intégration des principes du développement durable. Dans le tableau de bord, pour simplifier, ce type d’intervenant a été désigné par le terme d’animateur territorial. Ce tableau de bord a pour objectif de les aider à concevoir et/ou à évaluer des démarches participatives efficientes et cohérentes dans le cadre de la gouvernance territoriale des lieux et des espaces publics. [less ▲]