Noise and diffusion of particles obeying asymmetric exclusion processes

The relation between noise and Fick's diffusion coefficient in barrier limited transport associated with hopping or tunneling mechanisms of particles obeying the asymmetric simple exclusion processes (ASEP) is physically assessed by Monte Carlo simulations. For a closed ring consisting of a large number of barriers the diffusion coefficient is related explicitly to the current noise thus revealing the existence of a generalized Nyquist-Einstein relation. Both diffusion and noise are confirmed to decrease as the square root of the number of barriers as a consequence of the correlation induced by ASEP. By contrast, for an open linear chain of barriers the diffusion coefficient is found to be no longer related to current noise. Here diffusion depends on particle concentration but is independent of the number of barriers

Freight transport in Europe : policy issues and future scenarios on trans-border alpine connections

This paper presents an overview of European policy on interconnected cross-border transport networks as well as of severe problems in estimatingempirically the avalanche of goods movements in the European Union (EU). In particular, it deals with the Transalpine freight transport case, whichrepresents one of the most challenging operational and policy issues of the present and future - both international (EU) and national (the Alpinecountries) - freight transport developments. The paper is organised to briefly describe the main objectives of EU transport policy, to generallyintroduce the concept of intermodal transport with particular emphasis on intermodal freight transport and to describe past, present and futuredevelopments of the Trans.Alpine inter-modal transport. Various scenarios on the future development of Trans.Alpine intermodal transport are analysed as well

Non-Binary Message-Passing Algorithms for Magnetic Channels with Data-Dependent Noise

The paper proposes an implementation of the message passing algorithm adapted to iterative channel detection. The algorithm uses soft messages associated to non binary symbols in order to cancel cycles in the equivalent Tanner graphs, achieving optimal performance after a low number of iterations. This architecture, suited to very fast channel detectors, is applied to magnetic recording channels and adapted to the non stationary nature of the magnetic media noise