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Impulse waves generated by snow avalanches falling into lakes

Christophe Ancey

In recent years, the number of water reservoirs in high-altitude areas has increased. They are often used to provide water for various activities related with recreational (i.e. skiing) and production activities. Many of such reservoirs are threatened by s ...

IAHR2015

RANS computations of tip vortex cavitation

Mohamed Farhat, Matthieu Dreyer

The present study is related to the development of the tip vortex cavitation in Kaplan turbines. The investigation is carried out on a simplified test case consisting of a NACA0009 blade with a gap between the blade tip and the side wall. Computations with ...

Iop Publishing Ltd2015

Stability Results For The Volume Of Random Simplices

Gergely Ambrus

It is known that for a convex body K in R-d of volume one, the expected volume of random simplices in K is minimized if K is an ellipsoid, and for d = 2, maximized if K is a triangle. Here we provide corresponding stability estimates. ...

Johns Hopkins Univ Press2014

Microdrop generation and deposition of ionic liquids

Jürgen Brugger, Victor Javier Cadarso Busto

This work describes the use of a piezo-actuated inkjet print head with a nozzle aperture of 50 mu m to obtain picoliter drops of different model ionic liquids (ILs). A theoretical analysis of the microdrop generation of three model ILs is confirmed by expe ...

Materials Research Society2014

Early precipitation during cooling of an Al-Zn-Mg-Cu alloy revealed by in situ small angle X-ray scattering

Jean-Marie Drezet, Helena Van Swygenhoven, Patrick Schloth

Early subnanometre cluster formation during quenching of a high-strength AA7449 aluminium alloy was investigated using in situ small angle X-ray scattering. Fast quench cooling was obtained by using a laser-based heating system. The size and number density ...

American Institute of Physics2014

Réalisation d'un Démonstrateur pour Système de Stockage Hydropneumatique d'énergie

Adrien Aymon

L'objectif de ce projet est de concevoir et construire la partie mécanique du démonstrateur pour le système de stockage hydropneumatique d'énergie (HyPES). Le démonstrateur a comme éléments principaux, un moteur électrique, deux pompes à palettes, un réser ...

2013

On The Queue Number Of Planar Graphs

János Pach, Fabrizio Frati

We prove that planar graphs have O(log(2) n) queue number, thus improving upon the previous O(root n) upper bound. Consequently, planar graphs admit three-dimensional straight-line crossing-free grid drawings in O(n log(8) n) volume, thus improving upon th ...

Siam Publications2013

Buckling-induced encapsulation of structured elastic shells under pressure

Pedro Miguel Nunes Pereira de Almeida Reis

We introduce a class of continuum shell structures, the Buckliball, which undergoes a structural transformation induced by buckling under pressure loading. The geometry of the Buckliball comprises a spherical shell patterned with a regular array of circula ...

2012

Tunneling and percolation transport regimes in segregated composites

Peter Ryser, Claudio Grimaldi, Biagio Nigro

We consider the problem of electron transport in segregated conductor-insulator composites in which the conducting particles are connected to all others via tunneling conductances, thus forming a global tunneling-connected resistor network. Segregation is ...

2012

Free energy methods in coupled electron ion Monte Carlo

Elisa Liberatore

Recent progress in simulation methodologies and in computer power allow first-principles simulations of condensed systems with Born–Oppenheimer electronic energies obtained by quantum Monte Carlo methods. Computing free energies and therefore getting a qua ...

Taylor & Francis2011