Concept

École de Copenhague (physique)

Publications associées (158)

Spatiotemporal Gradient Analysis of Differential Microphone Arrays

Martin Vetterli, Mihailo Kolundzija, Christof Faller

The literature on gradient and differential microphone arrays makes a distinction between the two types, and nevertheless shows how both types can be used to obtain the same directional responses. A more theoretically sound rationale for using delays in di ...

2011

Micromechanical Study of Rock Fracture and Fragmentation under Dynamic Loads using Discrete Element Method

Tohid Kazerani

The study presented in this thesis aims to numerically explore the micro-mechanisms underlying rock fracture and fragmentation under dynamic loading. The approach adopted is based on the Discrete Element Method (DEM) coupled to the Cohesive Process Zone (C ...

EPFL2011

Magnetic-field-induced nonlocal effects on the vortex interactions in twin-free YBa_{2}Cu_{3}O_{7}

Jonathan White

The vortex lattice (VL) in the high-κ superconductor YBa2Cu3O7, at 2 K and with the magnetic field parallel to the crystal c axis, undergoes a sequence of transitions between different structures as a function of applied magnetic field. However, from struc ...

2011

Stochastic Models for Sparse and Piecewise-Smooth Signals

Michaël Unser, Pouya Dehghani Tafti

We introduce an extended family of continuous-domain stochastic models for sparse, piecewise-smooth signals. These are specified as solutions of stochastic differential equations, or, equivalently, in terms of a suitable innovation model; the latter is ana ...

IEEE2011

Assessing the accuracy of hybrid functionals in the determination of defect levels: Application to the As antisite in GaAs

Alfredo Pasquarello, Hannu-Pekka Komsa

The accuracy of nonscreened and screened hybrid functionals for the calculation of defect levels within the band gap is assessed for the As antisite in GaAs, the nature of which is well characterized experimentally. A set of functionals differing by the fr ...

2011

Modeling, design and characterization of a very wideband slot antenna with reconfigurable band rejection

Julien Perruisseau-Carrier

An antenna exhibiting a very wide bandwidth with reconfigurable rejection within the band is presented. The proposed topology is versatile in terms of the number of available antenna states and location of the rejection frequencies, and also allows the ope ...

Institute of Electrical and Electronics Engineers2010

Structural assignments of NMR chemical shifts in GexSe1-x glasses via first-principles calculations for GeSe2, Ge4Se9, and GeSe crystals

Alfredo Pasquarello, Carlo Massobrio, Mikhail Kibalchenko

Structural assignments are determined for Se-77 and Ge-73 chemical shifts through density-functional NMR calculations for GeSe2, Ge4Se9, and GeSe crystals. In particular, a very good agreement between calculated and measured Se-77 isotropic chemical shifts ...

2010

Origin of Plasticity Length-Scale Effects in Fracture

William Curtin

Fracture in metals is controlled by material behavior around the crack tip where size-dependent plasticity, now widely demonstrated at the micron scale, should play a key role. Here, a physical origin of the controlling length scales in fracture is identif ...

2010

Le strategie del rivestimento nell'architettura olandese contemporanea

Giampiero Sanguigni

The thesis wants to analyze "the strategies of wrapping in Dutch contemporary architecture" and wants to re-define, in a systematic way, some aspects that have not been investigated by those publications and authors that, since the beginning of the '90s un ...

EPFL2010

Evaluation of Cost-Effective Technologies for Highly Efficient Silicon-Based Solar Cells

Luca Gautero

The work underscores the feasibility of highly efficient silicon solar cell structures manufactured with high throughput machines. The main challenge consists in the implementation of more performant structures of intrinsic higher complexity. These structu ...

EPFL2010

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