Search results for "Rut"
showing 10 items of 2295 documents
Low-pressure ferroelastic phase transition in rutile-type AX2 minerals: cassiterite (SnO2), pyrolusite (MnO2) and sellaite (MgF2)
2019
The structural behaviour of cassiterite (SnO2), pyrolusite (MnO2) and sellaite (MgF2), i.e. AX2-minerals, has been investigated at room temperature by in situ high-pressure single-crystal diffraction, up to 14 GPa, using a diamond anvil cell. Such minerals undergo a ferroelastic phase transition, from rutile-like structure (SG: P42/mnm) to CaCl2-like structure (SG: Pnnm), at ≈ 10.25, 4.05 and 4.80 GPa, respectively. The structural evolution under pressure has been described by the trends of some structure parameters that are other than zero in the region of the low-symmetry phase’s stability. In particular, three tilting-angles (ω, ω′, ABS) and the metric distortion of the cation-centred oc…
Synthesis of single crystalline sub-micron rutile TiO2 rods using hydrothermal treatment in acidic media
2014
Size engineered rutile sub-micron rods were obtained from nanostructured titania under acidic conditions. The synthesis was performed by hydrothermal treatment starting from TiO2-P25 and HCl. The synthesis proceeds in less than two hours and can be up-scaled to several grams in a one-pot reaction by increasing the reaction time. The product is single-phase, and the particles are single crystalline as confirmed by electron diffraction and powder X-ray diffraction analysis. The length of the particles can be varied over a wide range from 100 nm to 1.3 μm by changing the acid concentration. Particle growth is proposed to proceed by a dissolution-recrystallization process via soluble [TiCl6]2− …
Experimental assessment of the shield-to-salt-fog properties of basalt and glass fiber reinforced composites in cork core sandwich panels applications
2018
Abstract In this paper, the effect of salt-fog exposition on the mechanical behavior of sandwich panels having cork agglomerate core was investigated. In particular, the aim of this research work is to assess the shield function of unidirectional basalt and E-glass reinforced polymer on the aging and failure mechanism of the core when such class of material are destined to operate in hostile environments (e.g., marine environment). To do this, the manufactured sandwich panels were exposed up to 60 days to salt-fog environment, according to ASTM B 117 standard. Unaged and aged specimens were analyzed through three point bending tests after aging time of 10, 25 and 60 days. Digital Image Corr…
The digitization of post-baccalaureate recruitment: Its challenges and its limits Can we speak of innovation?
2020
International audience; L’objet de la présente recherche est d’étudier comment par son rôle restructurant, le numérique, a remodelé le processus de recrutement des étudiants à destination des formations Post-B a c . Aussi, après avoir présenté une brève revue de la littérature sur les transformations du service public, en mettant en évidence les enjeux de la digitalisation, nous nous tournerons sur le processus de recrutement des étudiants dans l’enseignement supérieur en France. En effet, nous examinerons en quoi la mise en place etles adaptations de ce dernier peuvent constituer une innovation permettant de renforcer l’efficacité et l’efficience du service public?
Die darstellung von [(CH3)3PRu(CO)2Cl2]2 und [(Ch3)3P]2Ru(CO)2Cl2; Eine berichtigung zu: Die alkoholyse des triethylsilans katalysiert von [(Ch3)3P]2…
1984
Abstract The ruthenium(II) complex used as a catalyst in reactions of alcohols and Et 3 SiH proved to be the dimer [(CH 3 ) 3 PRu(CO) 2 Cl 2 ] 2 and not the complex [(CH 3 ) 3 P] 2 Ru(CO) 2 Cl 2 . Both complexes were prepared, characterized and their catalytic properties were compared.
Ti–Ru bimetallic complexes: catalysts for ring-closing metathesis
2002
The reaction of the titanocene monophosphanes ( 1 – 4 ) with the dimer [( p -cymene)RuCl 2 ] 2 gives the heterobimetallic compounds ( p -cymene)[(η 5 -C 5 H 5 )(μ-η 5 :η 1 -C 5 H 4 (CR 2 ) n PR′ 2 )TiCl 2 ]RuCl 2 ( 5 – 8 ). The structure of 8 , determined by X-ray diffraction, is reported here. A preliminary assessment of the performance of these complexes in ring-closing metathesis (RCM) revealed an excellent Ti–Ru–allenylidene pre-catalyst 12 .
Sacro, erotismo e ironia. Il corpo della donna ne "I Miracoli di Val Morel" di Dino Buzzati
2018
Ne "I miracoli di Val Morel" (1971) – una raccolta di immaginarie pitture votive originarie della valle bellunese e dedicate a Santa Rita – Dino Buzzati contrappone due tipi femminili: la peccatrice e la santa; la donna lussuriosa e la donna casta; la donna della tentazione e la donna della salvezza; la donna che espone il proprio corpo allo sguardo maschile e la donna pudica in abiti agostiniani. Le due figure femminili non costituiscono però una semplice contrapposizione tra due tipi ideali di donna, estetici o moraleggianti, ma la loro compresenza, nel testo verbale e visivo, si lega strettamente alle strategie di veridizione o, detto altrimenti, alla ricerca della verità, tema centrale …
Des caractéristiques des équipes de recherche aux pratiques de recrutement en entreprise
1999
International audience
Finite deformation analysis of laminated shell via the discontinuous Galerkin method
2022
In this work, we propose a novel formulation for the large displacements and post-buckling response analysis of laminated composite shell structures. In order to accurately recover the solution in the case of multilayered shells, the covariant components of the displacement field are approximated through the thickness using high-order structural theories. The non-linear two-dimensional total Lagrangian formulation is obtained starting from the Principle of Virtual Displacements for the three-dimensional elasticity assuming a linear constitutive relationship between the second Piola–Kirchhoff stress tensor and the Green-Lagrange strain tensor. The discontinuous Galerkin method is used in com…
IMPLICIT MESH DISCONTINUOUS GALERKIN FOR VARIABLE ANGLE TOW MULTILAYERED PLATES
2018
This works presents a novel computational scheme for variable angle tow (VAT) multilayered plates [1]. The characteristic features of the proposed scheme are the combined use of a discontinuous Galerkin (dG) formulation and an implicitly defined mesh. The formulation is based on the principle of virtual displacements (PVD) and the Equivalent Single Layer (ESL) assumption for the mechanical behavior of the VAT plates [2]. The problem is first placed within the dG framework by suitably introducing an auxiliary variable and by rewriting the set of equations governing ESL VAT plates as a firstorder system of differential equations. Following Arnold et al.[3] and by introducing suitably defined …