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Intermediate Common Model—The Solution to Separate Concerns and Responsiveness in Dynamic Context-Aware System
No full textInternational audienceNowadays, many works are interested in adapting to the context without taking into account neither the responsiveness to adapt their solution, nor the ability of designers to model all the relevant concerns. Our paper provides a new architecture for context management that tries to solve both problems. This approach is also based on the analysis and synthesis of context-aware frameworks proposed in literature. Our solution is focus on a separation of contextual concerns at the design phase and preserves it as much as possible at runtime. For this, we introduce the notion of independent views that allow designers to focus on their domain of expertise. At runtime, the architecture is splitted in 2 independent levels of adaptation. The highest is in charge of current context identification and manages each view independently. The lowest handles the adaptation of the application according to the rules granted by the previous level
Hermite type Spline spaces over rectangular meshes with complex topological structures
No full textInternational audienceMotivated by the magneto hydrodynamic (MHD) simulation for Tokamaks with Isogeometric analysis, we present a new type of splines defined over a rectangular mesh with arbitrary topology, which are piecewise polynomial functions of bidegree (d,d) and C^r parameter continuity. In particular, We compute their dimension and exhibit basis functions called Hermite bases for bicubic spline spaces. We investigate their potential applications for solving partial differential equations (PDEs) over a complex physical domain in the framework of Isogeometric analysis. In particular, weanalyze the property of approximation of these spline spaces for the L2-norm. Despite the fact that the basis functions are singular at extraordinary vertices, we show that the optimal approximation order and numerical convergence rates are reached by setting a proper parameterization
Erratum to 'Predominance of healthcare-associated cases among episodes of community-onset bacteraemia due to extended-spectrum β-lactamase-producing Enterobacteriaceae' [International Journal of Antimicrobial Agents 49/1 67-73].
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Heat transfer study of phase change materials with graphene nano particle for thermal energy storage
No full textInternational audienceThe thermal conductivity of commonly used phase change materials (PCM) for thermal energy storage (TES), such as, fatty acids, paraffin etc., is relatively poor, which is one of the main drawbacks for limiting their utility. In the recent past, few attempts have been made to enhance the thermal conductivity of PCM by mixing different additives in the appropriate amount. Graphene nanoparticles, having higher thermal conductivity may be a potential candidate for the same, when mixed appropriately with different PCM. In present study authors have carried out the numerical investigation for the melting of graphene nano-particles dispersed PCM filled in an aluminum square cavity heated from one side. In this work, the graphene nanoparticles are mixed in three different volumetric ratios (1%, 3%, and 5%), with three different commonly used categories of organic, inorganic and paraffin PCM (namely, Capric Acid, CaCl2·6H2O, and n-octadecane) to see the effect on melting of composite PCM developed. The resulting transient isotherms, velocity fields, and melting front and melt fractions thus have been deliberated in detail. These results clearly indicate that the addition of graphene nanoparticles increases melting rate but can also hamper the convection heat transfer within large cavities. The study also shows that such enhanced PCM can be effectively used for different TES applications in different fields. The prediction of temperature variation and rate of melting or solidification may be found useful especially for designing such TES devices
Mate Limitation in Fungal Plant Parasites Can Lead to Cyclic Epidemics in Perennial Host Populations
No full textInternational audienceFungal plant parasites represent a growing concern for biodiversity and food security. Most ascomycete species are capable of producing different types of infectious spores both asexually and sexually. Yet the contributions of both types of spores to epidemiological dynamics have still to been fully researched. Here we studied the effect of mate limitation in parasites which perform both sexual and asexual reproduction in the same host. Since mate limitation implies positive density dependence at low population density, we modeled the dynamics of such species with both density-dependent (sexual) and density-independent (asexual) transmission rates. A first simple SIR model incorporating these two types of transmission from the infected compartment, suggested that combining sexual and asexual spore production can generate persistently cyclic epidemics in a significant part of the parameter space. It was then confirmed that cyclic persistence could occur in realistic situations by pa-rameterizing a more detailed model fitting the biology of the Black Sigatoka disease of banana, for which literature data is available. We discuss the implications of these results for research on and management of Sigatoka diseases of banana
Sur le groupe fondamental des variétés kählériennes compactes de dimension 3
No full text29 pages. Comments are welcome.Let be a compact Kähler manifold of dimension three. We prove that there exists a projective manifold such that . We also prove the bimeromorphic existence of algebraic approximations for compact Kähler threefolds with algebraic dimension two. Together with the work of Graf and Lin this settles the bimeromorphic Kodaira problem for compact Kähler threefolds that are not uniruled.Soit une variété kählérienne compacte de dimension 3. Nous montrons qu'il existe une variété projective telle que . Nous établissons également l'existence (au sens biméromorphe) d'approximations algébriques pour les variétés kählériennes compactes de dimension 3 et de dimension algébrique 2. Conjugué aux travaux de Graf et Lin, cela répond au problème de Kodaira biméromorphe pour les variétés kählériennes compactes de dimension 3 non uniréglées
L'histoire au service de l'éducation civique: la permanence d'une ambition à l'école primaire
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Quantitative trait loci in pepper control the effective population size of two RNA viruses at inoculation
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Optimization and control of bio-conversion of polymeric substrate in the chemostat
No full textInternational audienceWe design a simple model of the growth of polymer-decomposing bacteria in a continuous stirred tank reactor. The dilution rate is controled to optimize the output of monomers. This model is studied in order to find the optimum at the stationary state. However, the optimal stationary state is not robust against perturbations, leading to washout in the bioreactor. We design a control that makes the closed system globally stable around the optimal equilibrium. Then, a more complex model for polymers and oligomers of any lengths is studied. It is shown that the same technics also lead to a globally stable optimal point for the controlled system