Concept

Percolation threshold

Publications associées (144)

VANET Connectivity Analysis

Jean-Pierre Hubaux, Panagiotis Papadimitratos, Olivier Dousse, Mohamed Kafsi

Vehicular Ad Hoc Networks (VANETs) are a peculiar subclass of mobile ad hoc networks that raise a number of technical challenges, notably from the point of view of their mobility models. In this paper, we provide a thorough analysis of the connectivity of ...

2008

Hydrogen Sensors based on Nanoscaled Discontinuities in Palladium

Jürgen Brugger, Luis Guillermo Villanueva Torrijo, Oscar Vazquez Mena, Thomas Kiefer, Arnaud Salette

In this project we develop hydrogen sensors based on nanoscaled discontinuities (nanogaps) in palladium (Pb). These nanogaps reversibly close and open upon hydrogen/air cycling due to an increased lattice constant in the hydrated state. Therewith, an elect ...

2008

Apparent nonuniversality in finite segregated tunneling-percolaiton models

Peter Ryser, Claudio Grimaldi

We investigate the tunneling-percolation mechanism of DC transport nonuniversality for conducting particles of diameter Φ placed in series within the bonds of length Lof a regular lattice model. When L/Φ→∞ the resulting bond conductance distribution functi ...

2007

Molecular Wiring of Insulators: Charging and Discharging Electrode Materials for High-Energy Lithium-Ion Batteries by Molecular Charge Transport Layers

Shaik Mohammed Zakeeruddin, Nicholas Evans

Self-assembled monolayers (SAMs) of redox-active molecules on mesoscopic substrates exhibit two-dimensional conductivity if their surface coverage exceeds the percolation threshold. Here, we show for the first time that such molecular charge transport laye ...

2007

Charge transport mechanisms in organic and microcrystalline silicon field-effect transistors

Libero Zuppiroli, Marie-Noëlle Bussac, Steven Konezny

Several organic and inorganic materials have emerged as promising candidates for the active layer of field-effect transistors (FETs) fabricated on flexible substrates. The charge transport models necessary for device optimization in these systems are at di ...

Spie-Int Soc Optical Engineering, Po Box 10, Bellingham, Wa 98227-0010 Usa2007

Multiwalled carbon nanotubes produced by a continuous CVD method and their use in melt mixed composites with polycarbonate

László Forró, Arnaud Magrez

In this study, two samples of multiwalled carbon nanotubes (MWNT) were synthesized by CVD of acetylene over Fe2Co catalysts supported by CaCO3 using different temperatures. The material produced at 660 °C (MWNT600) shows slightly better performance as evid ...

2007

Charge transport mechanisms in organic and microcrystalline silicon field-effect transistors

Libero Zuppiroli, Marie-Noëlle Bussac, Steven Konezny

International Society for Optical Engineering, Bellingham WA, WA 98227-0010, United States2007

Cooperative dynamics of loyal customers in queueing networks

Max-Olivier Hongler, Olivier Gallay

We consider queueing networks (QN) with feedback loops roamed by "intelligent" agents, able to select their routing on the basis of their measured waiting times at the QN nodes. This is an idealized model to discuss the dynamics of customers who stay loyal ...

2007

Development of pressure sensors by powder technology

Peter Ryser, Sebastien Martinerie, Thomas Maeder, Caroline Jacq, Sonia Vionnet Menot

Thick film deposition of conductive, dielectric and resistive pastes on ceramic membranes is a cost effective technique to manufacture piezoresistive pressure sensors. Thick-film resistors consist of a percolating network of conductive oxide nanoparticles ...

2007

On broadcast and agreement in mobile ad hoc networks

Yoav Sasson

This thesis studies communication and agreement protocols in wireless ad hoc networks from both theoretical and practical perspectives. The last decade has given rise to the rapid growth of wireless telecommunications such as cellular mobile phone networks ...

EPFL2007

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