Search results for "D stability"

showing 8 items of 38 documents

Rapid and eco-friendly synthesis of graphene oxide-silica nanohybrids

2014

The increasing interest in Graphene oxide (GO) is due to many issues: the presence of both sp2-conjugated atoms and oxygen-containing functional groups provides a strong hydrophilicity and the possibility to further functionalize it with other molecules (i.e. π-π interactions covalent attachment etc.) [1]. Furthermore since the GO is biocompatible and noncytotoxic many studies have been recently focused on the development of GO-based nanodevices for bioimaging DNA detection drug delivery. Due to their low cytotoxicity and large internal surface area silica nanoparticles have been taken into account as promising material for biolabeling and drug loading/delivery. Particular consideration has recently been demonstrated for GO-silica composites because of the potentialities for electrical applications their chemical inertia and stability toward ions exposure. The possibility to combine the extraordinary properties of GO and silica offers several advantages for the realization of nanoprobes for biological applications and of biosensor [12]. The strategy for the fabrication of GO-nanosilica nanohybrids can be schematized as follows: (i) synthesis of GO by oxidizing graphite powder with the method described by Marcano et al. [3] (ii) Preparation of oxygen-loaded silica nanoparticles by thermal treatments in controlled atmosphere in order to induce high NIR emission at 1272 nm from high purity silica nanoparticles. (iii) preparation of GrO-silica nanohybrid films via rapid solvent casting in water. The nanohybrids were tested by XPS FTIR Raman analysis UV photoluminescence analysis TGA Zeta potential measurements electrical tests AFM and SEM. Several nanohybrids were prepared by combining two different typologies of GO and two different samples of silica.
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Noisy dynamics in long and short Josephson junctions

The study of nonlinear dynamics in long Josephson junctions and the features of a particular kind of junction realized using a graphene layer, are the main topics of this research work. The superconducting state of a Josephson junction is a metastable state, and the switching to the resistive state is directly related to characteristic macroscopic quantities, such as the current the voltage across the junction, and the magnetic field through it. Noise sources can affect the mean lifetime of this superconducting metastable state, so that noise induced effects on the transient dynamics of these systems should be taken into account. The long Josephson junctions are investigated in the sine-Gor…

Transient dynamickinkmean switching timeSettore FIS/02 - Fisica Teorica Modelli E Metodi Matematicigraphenebreathernoise induced effectlong Josephson junctiondynamic resonant activationGaussian noisenoise enhanced stabilitysine-Gordonshort Josephson junctionnonlinear relaxation timeJosephson junctionJosephson junction; sine-Gordon; Transient dynamics; noise induced effect; noise enhanced stability; dynamic resonant activation; stochastic resonant activation; resonant activation; soliton; breather; kink; Gaussian noise; non Gaussian noise; graphene; short Josephson junction; long Josephson junction; mean switching time; nonlinear relaxation time;stochastic resonant activationresonant activationnon Gaussian noisesoliton
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Wheat (Triticum aestivum) yield stability and reliability in the Mediterranean semi arid environment

2012

Triticum aestivumyield stabilitySettore AGR/02 - Agronomia E Coltivazioni Erbacee
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Pois protéagineux : cheminement de la recherche génétique pour la sélection des paramètres à prendre en compte pour l’amélioration de la stabilité du…

2013

Field Pea: development of genetic research for the selection of parameters to take into account to improve yield stability. Legumes were essential in rotations in the past, but they fell off during the 20th century. Maybe they will come back into favour in the 21st century thanks to its economy, agri-environment and food assets. Field Pea is the main crop of this family in France, but it remains underdeveloped because its unstable yield does not enable the farmers to ensure their income security. Therefore researchers should focus on yield stability. Modelling Pea remains difficult because of its indeterminate development. Parameters to take into account are many and their significance must…

[SDE] Environmental Sciencesrootsagroecologyphenotypeélaboration d'idéotypelegumesgenotype[SDV]Life Sciences [q-bio]Genopearesistanceyield stabilitynutrition azotée optimaletolérance au stress hydriqueAphanomyces euteichesphénotypage[SDV.BV]Life Sciences [q-bio]/Vegetal Biology[SDV.BV] Life Sciences [q-bio]/Vegetal BiologygeneticsPisum sativumstress tolerancevarietal selectionfabaceaesymbiosisideotype[SDV] Life Sciences [q-bio]acquisition of nitrogen[SDE]Environmental Sciencesstabilité rendementfield peatolérance au froidpois protéagineuxnodulesRhizobium
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Noise phenomena and soliton dynamics in long Josephson junctions

2013

In this work we computationally explore the transient dynamics of a noisy Josephson junction (JJ). Principal purpose is to investigate the behavior of the lifetime of the superconductive state as a function of the system and noise source parameters. The relations between the emerging phenomena and the evolution of the JJ order parameter φ, that is the phase difference between the macroscopic wave functions describing the superconducting condensate in the two electrodes, is deeply investigated. We focus our interest on the switching events from the superconducting metastable state, and in particular on the mean escape time (MET). In the used model, a long JJ can be represented by a string co…

mean escape timebreatherwashboardGaussian noiseSettore FIS/03 - Fisica Della Materianon-Gaussian noisenoise enhanced stabilityLévysine-GordonJosephson junction; sine-Gordon; washboard; Lévy; Gaussian noise; non-Gaussian noise; soliton; breather; mean escape time; noise enhanced stability; resonant activationJosephson junctionresonant activationsoliton
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Plasmid Viability Depends on the Ecological Setting of Hosts within a Multiplasmid Community

2022

Plasmids are extrachromosomal genetic elements, some of which disperse horizontally between different strains and species of bacteria. They are a major factor in the dissemination of virulence factors and antibiotic resistance. Understanding the ecology of plasmids has a notable anthropocentric value, and therefore, the interactions between bacterial hosts and individual plasmids have been studied in detail. However, bacterial systems often carry multiple genetically distinct plasmids, but dynamics within these multiplasmid communities have remained unstudied. Here, we set to investigate the survival of 11 mobilizable or conjugative plasmids under five different conditions where the hosts h…

plasmid ecologyplasmiditantibiotic resistancetaudinaiheuttajatgeenitbiotekniikkaplasmid evolutionvirulenssimultiresistanceplasmid stabilityplasmid-mediated resistancebakteeritantibioottiresistenssi
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Enhancing Metastability by Dissipation and Driving in an Asymmetric Bistable Quantum System.

2018

The stabilizing effect of quantum fluctuations on the escape process and the relaxation dynamics from a quantum metastable state are investigated. Specifically, the quantum dynamics of a multilevel bistable system coupled to a bosonic Ohmic thermal bath in strong dissipation regime is analyzed. The study is performed by a non-perturbative method based on the real-time path integral approach of the Feynman-Vernon influence functional. We consider a strongly asymmetric double well potential with and without a monochromatic external driving, and with an out-of-equilibrium initial condition. In the absence of driving we observe a nonmonotonic behavior of the escape time from the metastable regi…

quantum statistical methodsQuantum dynamicsquantum Zeno dynamicsGeneral Physics and AstronomyDouble-well potentiallcsh:AstrophysicsReview01 natural sciencesSettore FIS/03 - Fisica Della Materia010305 fluids & plasmasPhysics and Astronomy (all)functional analytical methodstunnelingMetastability0103 physical scienceslcsh:QB460-466Quantum system010306 general physicslcsh:ScienceQuantum statistical methodQuantum fluctuationQuantum tunnellingPhysicsCondensed matter physicsQuantum noiseFunctional analytical methodQuantum Zeno dynamiclcsh:QC1-999noise enhanced stabilitymetastable potentialdiscrete variable representationOpen systemopen systemsRelaxation (physics)lcsh:Qresonant activationCaldeira-Leggett modellcsh:Physicsquantum systems with finite Hilbert spaceEntropy (Basel, Switzerland)
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Impact of non-programmable distributed generation in an islanded microgrid: the case study of Ustica

2022

The paper presents a systematic analysis of nonprogrammable distributed generation impact in an islanded microgrid Different issues have been analyzed, with a special focus on the most significant ones in a small islanded network. To this aim, the case study of Ustica island was considered A digital twin of the MV network was developed starting from the network topology data and the power measurement acquired in each secondary substation. Simulations were then performed in the hypothesis of a large increment of distributed generation installation into the network. A discussion is then reported on which are the main technical issues to be faced in the considered case study.

smart-gridgrid stabilityDistributed generationSettore ING-INF/07 - Misure Elettriche E Elettroniche2022 IEEE 21st Mediterranean Electrotechnical Conference (MELECON)
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