Nonextensive Interpretation Of Radiative Recombination In Electron Cooling

An interest for the low-energy range of the nonextensive distribution function arises from the study of radiative recombination in electron cooling devices in particle accelerators, whose experimentally measured reaction rates are much above the theoretical prediction. The use of generalized distributions, that differ from the Maxwellian in the low energy part (due to subdiffusion between electron and ion bunches), may account for the observed rate enhancement. In this work, we consider the isotropic distribution function and we propose a possible experiment for verifying the existence of a cut-off in the generalized momentum distribution, by measuring the spectrum of the X-rays emitted from radiative recombination reactions.Comment: 8 pages, 2 figures, Submitted for publication in the Proceedings of the 3rd International Conference NEXT-SigmaPhi, 2005, Cret

Reduction of Lie--Jordan algebras: Quantum

In this paper we present a theory of reduction of quantum systems in the presence of symmetries and constraints. The language used is that of Lie--Jordan Banach algebras, which are discussed in some detail together with spectrum properties and the space of states. The reduced Lie--Jordan Banach algebra is characterized together with the Dirac states on the physical algebra of observables

How to enhance crop production and nitrogen fluxes? A result-oriented scheme to evaluate best agri-environmental measures in Veneto Region, Italy

The cost-effectiveness of adopting agri-environmental measures (AEMs) in Europe, which combine agricultural productions with reduced N losses, is debated due to poorly targeted site-specific funding that is allocated regardless of local variability. An integrated DAYCENT model-GIS platform was developed combining pedo-climatic and agricultural systems information. The aim was to evaluate best strategies to improve N fluxes of agro-ecosystems within a perspective of sustainable intensification. Indicators of agronomic efficiency and environmental quality were considered. The results showed that agronomic benefits were observed with a continuous soil cover (conservation agriculture and cover crops), which enhanced nitrogen use efficiency (+17%) and crop yields (+34%), although in some cases these might be overestimated due to modelling limitations. An overall environmental improvement was found with continuous soil cover and long-term change from mineral to organic inputs (NLeach 45 Mg ha 121), which were effective in the sandy soils of western and eastern Veneto with low SOM, improving the soil-water balance and nutrients availability over time. Results suggest that AEM subsidies should be allocated at a site-specific level that includes pedo-climatic variability, following a result-oriented approach

Asymptotic residual stress distribution induced by multipass welding processes

publisher: Elsevier articletitle: Asymptotic residual stress distribution induced by multipass welding processes journaltitle: International Journal of Fatigue articlelink: http://dx.doi.org/10.1016/j.ijfatigue.2016.11.022 content_type: article copyright: © 2016 Elsevier Ltd. All rights reserved

An evaluation resource for geographic information retrieval

In this paper we present an evaluation resource for geographic information retrieval developed within the Cross Language Evaluation Forum (CLEF). The GeoCLEF track is dedicated to the evaluation of geographic information retrieval systems. The resource encompasses more than 600,000 documents, 75 topics so far, and more than 100,000 relevance judgments for these topics. Geographic information retrieval requires an evaluation resource which represents realistic information needs and which is geographically challenging. Some experimental results and analysis are reported

Asymptotic residual stresses in butt-welded joints under fatigue loading

If a weld toe is modelled as a sharp V-notch angle, the stress distribution near the notch tip is singular. Its intensity can then be quantified by means of Notch Stress Intensity Factors (NSIF), which have been proven to be capable of summarising the high-cycle fatigue strength of welded joints having very different global and local geometries. In presence of a singular residual stress field near the weld toe, the local load ratio is modified making the fatigue strength sensitive to residual stresses in the high-cycle regime. However, for an accurate estimation of the fatigue performance of welded joints, it is necessary to consider not only the initial residual stress field but also its variation under load, as both of these may play an important role. In this work the effect of fatigue loading on the asymptotic residual stress redistribution near the weld toe of a butt-welded joint is studied by means of numerical simulations. A model is then proposed to estimate the influence of residual stresses on the fatigue strength of welded joints. Experimental results taken from the literature were found in good agreement with those predicted by the proposed model

Pengembangan Aplikasi Interactive TV Pada Platform Set-Top Box Tertanam Berbasis Windows Embedded 7

. Interactive TV Application Development on Embedded Set-Top Box Platform Based on Windows Embedded 7. With the novelty of television technology that marked by the boom of DTV, Internet enabled Set-Top Box, and DVR, television users become more aware to interactive and rich experience of multimedia contents viewing on their television that later become the concept of interactive TV.Interactive TV allows viewers to take control of what they want to see something conventional TV can’t afford. In this research, there will be an application developed so that the user could enjoy extended services through their TV set. CETV is a proof of concept of interactive TV concept that enables users to access extended services. CETV is a group of 7 different application module that has their own feature and functionality. CETV delivers extended services and contents that bring interactivity and control to television users

GeoCLEF 2007: the CLEF 2007 cross-language geographic information retrieval track overview

GeoCLEF ran as a regular track for the second time within the Cross Language Evaluation Forum (CLEF) 2007. The purpose of GeoCLEF is to test and evaluate cross-language geographic information retrieval (GIR): retrieval for topics with a geographic specification. GeoCLEF 2007 consisted of two sub tasks. A search task ran for the third time and a query classification task was organized for the first. For the GeoCLEF 2007 search task, twenty-five search topics were defined by the organizing groups for searching English, German, Portuguese and Spanish document collections. All topics were translated into English, Indonesian, Portuguese, Spanish and German. Several topics in 2007 were geographically challenging. Thirteen groups submitted 108 runs. The groups used a variety of approaches. For the classification task, a query log from a search engine was provided and the groups needed to identify the queries with a geographic scope and the geographic components within the local queries