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Coupe sagittale

Publications associées (73)

Study of the twinned dendrite tip shape II: Experimental assessment

Michel Rappaz, Marco Cantoni, Pierre Burdet, Mario Alberto Salgado Ordorica

The favorable growth kinetics of twinned dendrites can be explained by their complex morphology, multiple side branching mechanisms, growth undercooling and tip morphology. Three models were proposed for the twinned dendrite tip shape: (i) a grooved tip sa ...

2011

Study of the twinned dendrite tip shape I : Phase-field modeling

Michel Rappaz, Jean-Luc Desbiolles, Mario Alberto Salgado Ordorica

The growth kinetics advantage of twinned aluminum dendrites over regular ones is still an unsolved problem of solidification. Although it is linked to the tip geometry, the influence of a coherent (1 1 1) twin plane on a < 1 1 0 > twinned dendrite tip is u ...

Elsevier2011

Solute trapping-free massive transformation at absolute stability

Wilfried Kurz, Alain Jacot

Directional transformation of a hypo-peritectic Fe–17.5 at.% Co alloy was studied. Two consecutive phase transformations—solidification (liquid to delta ferrite) and solid-state transformation (δ ferrite to γ austenite)—were observed and compared with theo ...

Elsevier2011

Growth-mode induced defects in epitaxial SrTiO3 thin films grown on single crystal LaAlO3 by a two-step PLD process

Nava Setter, Paul Muralt, Alexander Tagantsev, Roman Gysel, Nan Jiang

We grew epitaxial SrTiO3 (STO) thin films on (001) LaAlO3 substrates via a two-step procedure using pulsed laser deposition and studied them with transmission electron microscopy in plane-view and cross-sectional samples. We found that partial misfit dislo ...

Cambridge University Press2011

ELECTROMAGNETIC SIMULATIONS OF SIMPLE MODELS OF FERRITE LOADED KICKERS

Nicolas Frank Mounet, Carlo Zannini, Benoît Salvant

The kickers are major contributors to the CERN SPS beam coupling impedance. As such, they may represent a limitation to increasing the SPS bunch current in the frame of an intensity upgrade of the LHC. In this paper, CST Particle Studio time domain electro ...

2010

Defect Formation in Ga-Catalyzed Silicon Nanowires

Anna Fontcuberta i Morral, Sonia Conesa Boj, Li Wei, Père Roca i Cabarrocas

The synthesis of silicon nanowires by Ga-assisted plasma enhanced chemical vapor deposition (PECVD) has been recently demonstrated. In the present work, we study in detail the structural characteristics of the synthesized nanowires. High resolution transmi ...

American Chemical Society2010

Theoretical Investigation of Iterative Phase Retrieval Algorithm for Quasi-Optical Millimeter-Wave RF Beams

Stefano Alberti, Jean-Philippe Hogge

In this paper, we present a detailed analysis of the iterative phase retrieval approach (TPRA) for determining the phase profile of the output microwave beam of a gyrotron from known intensity patterns emphasizing the field propagation techniques which are ...

IEEE2009

EBSD: a powerful microstructure analysis technique in the field of solidification

Michel Rappaz, Emmanuelle Boehm Courjault, Alain Jacot, Mario Alberto Salgado Ordorica, Aurèle Mariaux, Christoph Niederberger

This paper presents a few examples of the application of electron back-scatter diffraction (EBSD) to solidification problems. For directionally solidified Al-Zn samples, this technique could reveal the change in dendrite growth directions from < 100 > to < ...

2009

Two-dimensional electrostatic force field measurements with simultaneous topography measurement on embedded interdigitated nanoelectrodes using a force distance curve based method

Patrik Willi Hoffmann, Christian Santschi

Accurate simultaneous measurements on the topography and electrostatic force field of 500 nm pitch interdigitated electrodes embedded in a thin SiO2 layer in a plane perpendicular to the orientation of the electrodes are shown for the first time. A static ...

2008

Absolute depth-dose-rate measurements for an 192Ir HDR brachytherapy source in water using MOSFET detectors

Rakesh Chawla

Reported MOSFET measurements concern mostly external radiotherapy and in vivo dosimetry. In this paper, we apply the technique for absolute dosimetry in the context of HDR brachytherapy using an 192Ir source. Measured radial dose rate distributions in wate ...

AIP for American Assoc. Phys. Med2006

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