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Design of a high efficiency pulsed slow positron beam for measurements of porous silicon and polymer films
(2004)LAPP-EXP-2004.08; INR-HEP-2004.31This document presents the design of a pulsed slow positron beam to study porous silicon and polymer films. Slow positrons are produced with a conven- tional technique using a ^22Na source and a tungsten film moderator. The goal of the proposed design is to reach a pulse duration of 0.3 ns FWHM at the target. The scheme of the beam includes two choppers and two bunchers. The distinctive features of the proposed design lie ...Report -
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Developpement de modeles suisses pour la prediction de la demande en transport pour des applications en temps reel
(2004)Département Fédéral de l’Environnement, des Transports, de l’Energie et de la Communication, Office Fédéral des RoutesReport -
A Fully Decentralized Approach to Coordinating Transactional Processes in Peer-to-Peer Environments
(2004)Technical reportWith the proliferation of e-business, peer-to-peer style business collaboration becomes increasingly popular. In peer-to-peer environments each peer provides a set of services. These services can be composed to processes running over several peers. Although peer-to-peer environments inherently lack global control, some business processes nevertheless require global transactional guarantees, i.e., atomicity and isolation applied at the ...Report -
On a conjectured increasing series
(2004)Research ReportThe rate of total heat loss of two bodies maintained at constant temperature in a homogeneous conducting medium of low temperature is a function of the distance between the two bodies. Assuming spherical bodies with equal temperatures, this function has been explicitly computed in [4] and its monotonic increase has been verified numerically. In this note we give a rigorous completely elementary proof of this fact, and thus ...Report -
Railway Delay Management
(2004)Technical reportsWe consider delay management in railway systems. Given delayed trains, we want to find a waiting policy for the connecting trains minimizing the weighted total passenger delay. If there is a single delayed train and passengers transfer at most twice along fixed routes, or if the railway network has a tree structure, the problem can be solved by reduction to min-cut problems. For delayed passenger flows on a railway network with a path ...Report