554 research outputs found
Quatuor Bozzini : de l’audace underground et upperground
No full textCet article est écrit en deux temps. Retournant au moment de l’émergence du Quatuor Bozzini au début des années 2000, il retrace certaines des propositions esthétiques de l’ensemble, et analyse la manière dont elles ont participé à une certaine redéfinition du mandat d’un ensemble de musique contemporaine, ainsi qu’à une nouvelle compréhension de la collaboration. L’article se tourne ensuite vers les témoignages de six collaborateur.ice.s du Quatuor, soit Éliane Radigue, Phill Niblock, Marc Boivin, Nicole Lizée, Simon Martin et James O’Callaghan. Ces six artistes soulignent, presque d’un commun effort, dirait-on, le sérieux et l’immense sensibilité avec lesquels le Quatuor Bozzini traverse les différentes sphères créatrices proposées par leurs collaborateurs, ou encore initiées de leur propre chef.The aims of this article are twofold. Looking back to Quatuor Bozzini’s emergence in the early 2000s, the author traces some of the ensemble’s aesthetic propositions, and analyzes how they participated in redefining what is now understood as the mandate of a contemporary-music oriented ensemble, as well as their approaches to collaboration. The article then turns to six of Quatuor Bozzini’s collaborators: Éliane Radigue, Phill Niblock, Marc Boivin, Nicole Lizée, Simon Martin and James O’Callaghan. Almost as one, the six artists speak of the immense sensitivity with which Quatuor Bozzini dedicates itself to each of their collaborative projects
Spectroelectrochemical investigation of the anodic and cathodic behaviour of zinc in 5.3 M KOH
No full textA corrosion and electrodeposition study of a Zn
electrode in 5.3 M KOH, used as a model system for the
anode of a secondary Zn–air battery, was performed by
means of electrochemical and spectroelectrochemical
techniques. The formation of a zinc oxide passive film and
its cathodic removal were monitored by electroreflectance
spectroscopy, spectroellipsometry and optical second harmonic
generation. A dynamic optical model of the growth
pathway, morphology and failure modes of the interfacial
Zn oxide films was proposed to rationalise the electrokinetics
of the secondary battery anode. Some experiments
were performed in the absence and in the presence of
polyethylene glycol. In situ spectroscopy confirmed and
placed on a molecular basis the well-known formation of
more compact and uniform electrodeposits crucial for
secondary batteries.
Keywords Zn–air batter
Ionic liquids as solvents for rare-earth metals: a combined XAS and Molecular Dynamics study
No full textIn this work a detailed investigation of the structural organization of ILs, both monocationic and dicationic, and their water mixtures has been carried out by combining XAS spectroscopy and Classical MD simulations. The same joint XAS-MD approach has been also applied to the study of the solvation properties of Ln(III) salts dissolved in ILs. The original application of EXAFS and MD simulations paves the route for the systematic use of an integrated approach, with increased reliability, in the structural investigation of ILs. All together these issues are expected to be of great help in the systematic design of IL systems to meet the requirements of key applications
Weakly nonlinear analysis of Turing patterns in a morphochemical model for metal growth
No full textWe focus on the morphochemical reaction–diffusion model introduced in Bozzini et al.
(2013) and carry out a nonlinear bifurcation analysis with the aim to characterize the shape
and the amplitude of the patterns arising as the result of Turing instability of the physically
relevant equilibrium. We perform a weakly nonlinear multiple scales analysis, and derive
the normal form equations governing the amplitude of the patterns. These amplitude equations
allow us to construct relevant solutions of the model equations and reveal the presence
of multiple branches of stable solutions arising as the result of subcritical bifurcations.
Hysteretic type phenomena are highlighted also through numerical simulations. We show
the occurrence of spatial pattern propagation and derive the Ginzburg–Landau equation
describing the envelope of the traveling wavefront
Electrochemical fabrication of nanoporous gold decorated with manganese oxide nanowires from eutectic urea/choline chloride ionic liquid. Part III − Electrodeposition of Au–Mn: a study based on in situ Sum-Frequency Generation and Raman spectroscopies
No full textIn two previous papers (C. Mele, M. Catalano, A. Taurino, B. Bozzini. Electrochim. Acta 87 (2013) 918; B. Bozzini, A. Gianoncelli, C. Mele, M. Kiskinova. Electrochim. Acta 114 (2013) 889), we have: (i) fabricated high-capacitance materials consisting of nanoporous gold (NPG)-supported MnO2 nanowires (NW), by electrochemical etching of single-phase Au-Mn alloys electrodeposited from a deep eutectic solvent (DES) electrolyte and (ii) investigated some aspects of the precursor Au-Mn alloy electrodeposition process by following it in situ with space-resolved soft X-ray fluorescence (XRF) and absorption (XAS) microspectroscopies: this study has allowed to single-out the peculiarities of elemental and chemical-state distribution that contribute to the nanostructure fabrication. The present paper completes the electrodeposition study by investigating the potential-dependent interfacial composition of the growing Au-Mn alloys by complementary in situ linear (Raman) and non-linear (Sum-Frequency Generation - SFG) vibrational spectroscopies. The results regarding alloy electrodeposition are compared to those obtained with a pure Au bath. In situ spectroscopy during electrodeposition reveals that both choline cation and urea are present at the growing metal/DES interface, coadsorbed with CN resulting from the decomposition of the Au complex. Electrostatic adsorption controls the surface coverage scenario at the Au/DES interface, while Mn favours the relative surface coverage with urea. Moreover, the interaction of urea with the metal film is modified by the addition of Mn, switching from solid-like to liquid-like at the Mn-alloying potential threshold. Also the CN adsorption scenario is sensitive to surface alloying: the Mn-containing interface shows two adsorption sites with lower degree of metal-adsorbate charge transfer. Finally, the degree of surface enhancement correlates well on the one hand with the applied potential and the interfacial chemistry, and on the other hand with the crystallite morphology induced by alloying Au with Mn. The correlation among the spectroelectrochemical scenario, the potential-dependent alloy composition and the crystallite shape expressed by this investigation fits within the framework set by recent modelling of dynamic electrodeposition morphochemistry and opens up novel opportunities for improving the control over the functional properties of net-shape electrodeposited material
Weakly nonlinear analysis of Turing patterns in a morphochemical model for metal growth
No full textWe focus on the morphochemical reaction-diffusion model introduced in Bozzini et al. (2013) and carry out a nonlinear bifurcation analysis with the aim to characterize the shape and the amplitude of the patterns arising as the result of Turing instability of the physically relevant equilibrium. We perform a weakly nonlinear multiple scales analysis, and derive the normal form equations governing the amplitude of the patterns. These amplitude equations allow us to construct relevant solutions of the model equations and reveal the presence of multiple branches of stable solutions arising as the result of subcritical bifurcations. Hysteretic type phenomena are highlighted also through numerical simulations. We show the occurrence of spatial pattern propagation and derive the Ginzburg-Landau equation describing the envelope of the traveling wavefront
Measurement and modelling of some mechanical properties of electroless NiP/diamond particulate metal matrix composite thin films
No full text
FRACTURE TOUGHNESS OF SUPPORTED Ni P FILMS PREPARED BY AUTOCAT¬ALYTIC CHEMICAL DEPOSITION
No full textElectrochemical and X-ray photoelectron spectroscopy investigation into anodic behaviour of electroless Ni–9·5 wt-%P in acidic chloride environment
No full textThis paper reports on the anodic behaviour of as plated (X-ray amorphous) and heat treated (crystalline) high P electroless Ni-P deposits investigated by potentiodynamic and potentiostatic methods in acidic aqueous chloride solutions. Potentiodynamic measurements show all active-passive behaviour for both structures. The valence of P dissolution was assessed by the weight loss v. charge technique; dissolution valences do not correlate clearly with potentiodynamic behaviour. This call nevertheless he clearly interpreted ill terms of ex situ X-ray photoelectron spectroscopy analyses of attacked layer composition: the layers formed at lower anodic potential within the passive range consist of NiO, the ones obtained at high anodic polarisation contain phosphate. Differences ill anodic behaviour of as plated and heat treated specimens can he explained in terms of the defectiveness of protective NiO layers as a function of grain boundaries emerging at the surface
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