Concept

Percolation critical exponents

Related publications (190)

Closing the gap in the capacity of random wireless networks

We consider the problem of how throughput in a wireless network with randomly located nodes scales as the number of users grows. Following the physical model of Gupta and Kumar, we show that randomly scattered nodes can achieve the optimal 1/sqrt(n) per-no ...

2004

Microfabricated AFM probe with tungsten cantilever and < 40 nm pyramidal tip

Jürgen Brugger, Johannes Steen

In the past, conducting AFM probes have been made by coating standard Si-cantilevers and tips with a thin film of e.g. tungsten (W). Here, we describe a new AFM probe made entirely out of tungsten. The fabrication involves microfabrication techniques such ...

2004

A model of transport nonuniversality in thick-film resistors

Peter Ryser, Claudio Grimaldi, Thomas Maeder

We propose a model of transport in thick-film resistors which naturally explains the observed nonuniversal values of the conductance exponent t extracted in the vicinity of the percolation transition. Essential ingredients of the model are the segregated m ...

2003

Critical behaviour of the piezoresistive response in RuO2-glass composites

Peter Ryser, Claudio Grimaldi, Thomas Maeder

We re-analyse earlier measurements of resistance R and piezoresistance K in RuO2-based thick-film resistors (TFRs). The percolating nature of transport in these systems is well accounted by values of the transport exponent t larger than its universal value ...

2003

Segregated tunneling-percolation model for transport nonuniversality

Peter Ryser, Claudio Grimaldi, Thomas Maeder

We propose a theory of the origin of transport nonuniversality in disordered insulating-conducting compounds based on the interplay between microstructure and tunneling processes between metallic grains dispersed in the insulating host. We show that if the ...

2003

Piezoresistivity and conductance anisotropy of tunneling-percolating systems

Peter Ryser, Claudio Grimaldi, Thomas Maeder

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

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

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