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A bounded random walk exhibits strong correlations between collisions with a boundary. For an one-dimensional walk, we obtain the full statistical distribution of the number of such collisions in a time t. In the large t limit, the fluctuations in the number of collisions are found to be size-independent (independent of the distance between boundaries). This occurs for any inter-boundary distance, including less and greater than the mean-free-path, and means that this boundary effect does not decay with increasing system-size. As an application, we consider spin-polarized gases, such as 3-Helium, in the three-dimensional diffusive regime. The above results mean that the depolarizing effect of rare magnetic-impurities in the container walls is orders of magnitude larger than a Smoluchowski assumption (to neglect correlations) would imply. This could explain why depolarization is so sensitive to the container's treatment with magnetic fields prior to its use., Comment: 5 page manuscript with extra details in appendices (additional 3 pages)

We present a thinking on the concept of relational networks applied to the french national occupational disease surveillance and prevention network (R\'eseau National de Vigilance et de Pr\'evention des Pathologies Professionnelles, RNV3P). This approach consists in searching common exposures to occupational health problems.

In the context of surveillance of health problems, the research carried out by the French national occupational disease surveillance and prevention network (R\'eseau National de Vigilance et de Pr\'evention des Pathologies Professionnelles, RNV3P) aims to develop, among other approaches, methods of surveillance, statistical analysis and modeling in order to study the structure and change over time of relationships between disease and exposure, and to detect emerging disease-exposure associations. In this perspective, this paper aims to present the concept of the "exposome" and to explain on what bases it is constructed. The exposome is defined as a network of relationships between occupational health problems that have in common one or several elements of occupational exposure (exposures, occupation and/or activity sector). The paper also aims to outline its potential for the study and programmed surveillance of composite disease-occupational exposure associations. We illustrate this approach by applying it to a sample from the RNV3P data, taking malignant tumours and focusing on the subgroup of non-Hodgkin lymphomas.

We address the relation between long range correlations and charge transfer efficiency in aperiodic artificial or genomic DNA sequences. Coherent charge transfer through the HOMO states of the guanine nucleotide is studied using the transmission approach, and focus is made on how the sequence-dependent backscattering profile can be inferred from correlations between base pairs., Comment: Submitted to Phys. Rev. Lett