A Graph Theory Approach for Regional Controllability of Boolean Cellular Automata

Controllability is one of the central concepts of modern control theory that allows a good understanding of a system's behaviour. It consists in constraining a system to reach the desired state from an initial state within a given time interval. When the desired objective affects only a sub-region of the domain, the control is said to be regional. The purpose of this paper is to study a particular case of regional control using cellular automata models since they are spatially extended systems where spatial properties can be easily defined thanks to their intrinsic locality. We investigate the case of boundary controls on the target region using an original approach based on graph theory. Necessary and sufficient conditions are given based on the Hamiltonian Circuit and strongly connected component. The controls are obtained using a preimage approach

Solitonic dispersive hydrodynamics: theory and observation

Ubiquitous nonlinear waves in dispersive media include localized solitons and extended hydrodynamic states such as dispersive shock waves. Despite their physical prominence and the development of thorough theoretical and experimental investigations of each separately, experiments and a unified theory of solitons and dispersive hydrodynamics are lacking. Here, a general soliton-mean field theory is introduced and used to describe the propagation of solitons in macroscopic hydrodynamic flows. Two universal adiabatic invariants of motion are identified that predict trapping or transmission of solitons by hydrodynamic states. The result of solitons incident upon smooth expansion waves or compressive, rapidly oscillating dispersive shock waves is the same, an effect termed hydrodynamic reciprocity. Experiments on viscous fluid conduits quantitatively confirm the soliton-mean field theory with broader implications for nonlinear optics, superfluids, geophysical fluids, and other dispersive hydrodynamic media.Comment: 8 pages, 5 figure

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Revival-collapse phenomenon in the quadrature squeezing of the multiphoton Jaynes-Cummings model with the binomial states

In this paper we study the interaction between two-level atom and quantized single-mode field, namely, Jaynes-Cummings model (JCM). The field and the atom are initially prepared in the binomial state and the excited atomic state, respectively. For this system we prove that the revival-collapse phenomenon exhibited in the atomic inversion of the standard JCM can be numerically (naturally) manifested in the evolution of the squeezing factor of the three-photon (standard) JCM provided that the initial photon-number distribution of the radiation has a smooth envelope.Comment: 14 pages, 4 figures, Comments are most welcom

Recovery of valuable materials from end-of-life photovoltaic solar panels

The disposal of end-of-life (EOL) photovoltaic solar panels has become a relevant environmental issue as they are considered to be a hazardous electronic waste. On the other hand, enormous benefits are achieved from recovering valuable metals and materials from such waste. Eventually, physical and chemical processing will become the most important stages during the recycling process. A physical treatment including crushing, grinding, and screening was achieved, and it was observed that a fine fraction of −0.25 mm had the maximum percentage of the required materials. Moreover, the optimum chemical treatment conditions were adjusted to reach the maximum recovery of silver, aluminum, and silicon. The synthesis of silicon oxide, silver oxide, alunite, and K-Alum from leachant solution was performed through a simple route. The structural and morphological properties of the prepared materials were defined by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and field emission scanning electron microscopy (FESEM)

Control of cellular automata

We study the problem of master-slave synchronization and control of totalistic cellular automata (CA) by putting a fraction of sites of the slave equal to those of the master and finding the distance between both as a function of this fraction. We present three control strategies that exploit local information about the CA, mainly, the number of nonzero Boolean derivatives. When no local information is used, we speak of synchronization. We find the critical properties of control and discuss the best control strategy compared with synchronization

Isolation And molecular characterization of xylella fastidiosa from different host plant species in Italy (Apulia region)

L'isolement en culture pure de la souche Xylella fastidiosa liée au syndrome de déclin rapide de l'olivier (OQDS), récemment observé dans les Pouilles (sud de l'Italie) a été tenté à partir des plantes symptomatiques naturellement infectée, principalement Olea europaea L., Polygala myrtifolia et Rosmarinus officinalis, en utilisant les méthodes d'impression et d'extraction de la sève. Avant l'isolement, RT-LAMP et qPCR ont été utilisés pour déterminer la présence de X. fastidiosa chez tous les hôtes. Des cultures bactériennes pures ont été obtenues à partir d'extraits d'Olea europaea L. et de Polygala myrtifolia étalés dans un milieu tamponné d'extrait de cystéine-levure (BCYE). Deux isolats d'olive ont ensuite été typés à l'aide du système de séquençage multilocus (MLST). Les résultats indiquent qu'Olea europaea a un grand potentiel d'isolement, et la méthode d'impression a présenté des résultats nettement meilleurs. MLST montre des points communs génétiques avec la souche De Donno (ST53) et confirme que nous avons toujours le même type de séquence ST53 dans la région.Pure culture isolation of the Xylella fastidiosa strain related to the olive quick declinesyndrome (OQDS), lately noticed in Apulia (southern Italy) was attempted fromnaturally infected symptomatic plants mainly Olea europaea L., Polygala myrtifolia and Rosmarinus officinalis using printing and sap extraction methods. Prior to isolation, RTLAMP and qPCR were used to determine the presence of Xylella fastidiosa in all hosts. Pure bacterial cultures were obtained from both Olea europaea L. and Polygala myrtifolia extracts plated in buffered cysteine-yeast extract (BCYE) media. Two olive isolates were subsequently typed using the Multilocus Sequencing System (MLST). Findings indicate that beside Olea europaea, Polygala myrtifolia seems to have a good potential for isolation, and printing method has presented significantly better results. MLST shows genetic commonality with De Donno (ST53) strain and ascertain that Apulia region still have the same sequence type ST53 in the region