3,932 research outputs found
Higher index focus-focus singularities in the Jayne-Cummings-Gaudin model : symplectic invariants and monodromy
We study the symplectic geometry of the Jaynes-Cummings-Gaudin model with
spins. We show that there are focus-focus singularities of maximal
Williamson type . We construct the linearized normal flows in the
vicinity of such a point and show that soliton type solutions extend them
globally on the critical torus. This allows us to compute the leading term in
the Taylor expansion of the symplectic invariants and the monodromy associated
to this singularity.Comment: 39 page
Dynamical lattice computation of the Isgur-Wise functions τ1/2 and τ3/2
We perform a two-flavor dynamical lattice computation of the Isgur-Wise functions t1/2 and t3/2
at zero recoil in the static limit. We find t1/2(1) = 0.297(26) and t3/2(1) = 0.528(23) fulfilling
Uraltsev’s sum rule by around 80%. We also comment on a persistent conflict between theory and
experiment regarding semileptonic decays of B mesons into orbitally excited P wave D mesons,
the so-called “1/2 versus 3/2 puzzle”, and we discuss the relevance of lattice results in this
context
Species separation and modification of neutron diagnostics in inertial-confinement fusion
The different behaviours of deuterium (D) and tritium (T) in the hot spot of
marginally-igniting cryogenic DT inertial-confinement fusion (ICF) targets are
investigated with an ion Fokker-Planck model. With respect to an equivalent
single-species model, a higher density and a higher temperature are found for T
in the stagnation phase of the target implosion. In addition, the stagnating
hot spot is found to be less dense but hotter than in the single-species case.
As a result, the fusion reaction yield in the hot spot is significantly
increased. Fusion neutron diagnostics of the implosion find a larger ion
temperature as deduced from DT reactions than from DD reactions, in good
agreement with NIF experimental results. ICF target designs should thus
definitely take ion-kinetic effects into account
Reconfiguration of Distributed Information Fusion System ? A case study
Information Fusion Systems are now widely used in different fusion contexts,
like scientific processing, sensor networks, video and image processing. One of
the current trends in this area is to cope with distributed systems. In this
context, we have defined and implemented a Dynamic Distributed Information
Fusion System runtime model. It allows us to cope with dynamic execution
supports while trying to maintain the functionalities of a given Dynamic
Distributed Information Fusion System. The paper presents our system, the
reconfiguration problems we are faced with and our solutions.Comment: 6 pages - Preprint versio
The Impact of Interface Quality on Trust in Web Retailers
Web retailing is expected to grow at aggressive rates in future years. One of the most important factors that is slowing down this growth is the lack of trust of potential customers. So, as transactions through the internet develop and mature, success will largely be dependent on gaining and0501ntaining this trust. It has been suggested that the quality of the user interface of the Web site is a determinant of the initial establishment of trust. In this article, we describe a study where 66 subjects were asked to perform some predefined book purchasing task in a series of sites with varying interface quality. We found a strong relationship between interface quality and trust. We also found some components of user interface quality to be more important than others and discuss the implications for Web site design. Le manque de confiance constitue une des barrières les plus importantes à l'adoption et au développement du commerce électronique. Centré sur le commerce électronique de détail, ce travail présente un modèle permettant d'analyser le développement de la confiance du consommateur en fonction des caractéristiques de ce dernier - sa propension - et de la perception qu'il a de certaines caractéristiques du commerçant, soit l'intégrité, l'habilité et la bienveillance de ce dernier. L'utilisabilité de l'interface graphique a été retenue comme étant le facteur-clé en ce qui concerne la perception de ces caractéristiques. Le rôle de chacune des dimensions composant l'utilisabilité a donc été étudié et mis en évidence relativement à la confiance développée par le consommateur.User interface, laboratory experiment, trust, usability, electronic retailing, web design, Interface utilisateur, expérimentation en laboratoire, confiance, b2c, commerce électronique (détail), design de site web
Kompren: Modeling and Generating Model Slicers
International audienc
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