Concept

Percolation threshold

Publications associées (144)

Transport nonuniversality and critical behavior of the piezoresistive response in thick-film resistors

Peter Ryser, Claudio Grimaldi, Thomas Maeder, Sonia Vionnet Menot

Thick-film resistors (TFRs) consist of a percolating network of conducting oxide nanoparticlesdispersed in an insulating glassy matrix, whose resistive properties are dominated by quantumtunneling across insulating layers separating adjacent conducting gra ...

2003

Impact of Interferences on Connectivity in Ad Hoc Networks

Patrick Thiran, Olivier Dousse

We study the impact of interferences on the connectivity of large-scale ad-hoc networks, using percolation theory. We assume that a bi-directional connection can be set up between two nodes if the signal to noise ratio at reception is larger than some thre ...

2003

Dependence of the O-2 diffusion rate on oxide thickness during silicon oxidation

Alfredo Pasquarello, Angelo Bongiorno

We address the rate of O-2 diffusion through the oxide layer at Si-SiO2 interfaces using an atomic-scale approach. In particular, we investigate the combined effect of a percolative diffusion mechanism and of a dense oxide layer located close to the silico ...

2003

Probabilistic Broadcast for Flooding in Wireless Mobile Ad hoc Networks

André Schiper, David Cavin, Yoav Sasson

Although far from optimal, flooding is an in- dispensable message dissemination technique for network- wide broadcast within mobile ad hoc networks (MANETs). As such, the plain flooding algorithm provokes a high number of unnecessary packet rebroadcasts, c ...

2002

Connectivity in ad-hoc and hybrid networks

Martin Hasler

We consider a large-scale wireless network, but with a low density of nodes per unit area. Interferences are then less critical, contrary to connectivity. This paper studies the latter property for both a purely ad-hoc network and a hybrid network, where f ...

2002

Connectivity in ad-hoc and hybrid networks

Patrick Thiran, Martin Hasler, Olivier Dousse

2002

Constant-current study of dielectric breakdown of Pb(Zr,Ti)O-3 ferroelectric film capacitors

Nava Setter, Alexander Tagantsev, Igor Stolichnov, Serguei Okhonin

This paper addresses the problem of time-dependent dielectric breakdown of Pb(Zr,Ti)O-3 (PZT) thin films. It is shown by using constant-current breakdown measurements, that for PZT film capacitors with Pt and SrRuO3 (SRO) electrodes the breakdown onset is ...

2001

Accurate DC conductivity for hopping conduction within the continuous time random walk approach

William Curtin

The continuous time random walk approach for hopping conduction in disordered systems is modified to obtain accurate DC conductivity values over a wide range of hopping site densities. The modification involves eliminating a small fraction of particularly ...

2000

Dielectric breakdown in (Pb,La)(Zr,Ti)O-3 ferroelectric thin films with Pt and oxide electrodes

Nava Setter, Alexander Tagantsev, Igor Stolichnov, Serguei Okhonin

Dielectric breakdown of (Pb,La)(Zr,Ti)O-3(PLZT) film capacitors with Pt and SrRuO3 electrodes, in its initial or virgin state and after voltage cycling that causes polarization fatigue, is studied by constant-current measurements. It is shown that for diff ...

2000

Absorption and fluorescence spectra of Ar-matrix-isolated Ag3 clusters

Wolfgang Harbich, Christoph Sieber

The absorption and fluorescence spectra of silver trimers isolated in an Ar matrix show the existence of three distinct lattice sites whereby the population of each site depends on the conditions of matrix preparation. Irradiation of certain absorption ban ...

2000

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