Harvesting Excitons Through Plasmonic Strong Coupling

Exciton harvesting is demonstrated in an ensemble of quantum emitters coupled to localized surface plasmons. When the interaction between emitters and the dipole mode of a metallic nanosphere reaches the strong coupling regime, the exciton conductance is greatly increased. The spatial map of the conductance matches the plasmon field intensity profile, which indicates that transport properties can be tuned by adequately tailoring the field of the plasmonic resonance. Under strong coupling, we find that pure dephasing can have detrimental or beneficial effects on the conductance, depending on the effective number of participating emitters. Finally, we show that the exciton transport in the strong coupling regime occurs on an ultrafast timescale given by the inverse Rabi splitting ($\sim10~$fs), orders of magnitude faster than transport through direct hopping between the emitters.Comment: 5 pages, 3 figure

Disease Localization in Multilayer Networks

We present a continuous formulation of epidemic spreading on multilayer networks using a tensorial representation, extending the models of monoplex networks to this context. We derive analytical expressions for the epidemic threshold of the SIS and SIR dynamics, as well as upper and lower bounds for the disease prevalence in the steady state for the SIS scenario. Using the quasi-stationary state method we numerically show the existence of disease localization and the emergence of two or more susceptibility peaks, which are characterized analytically and numerically through the inverse participation ratio. Furthermore, when mapping the critical dynamics to an eigenvalue problem, we observe a characteristic transition in the eigenvalue spectra of the supra-contact tensor as a function of the ratio of two spreading rates: if the rate at which the disease spreads within a layer is comparable to the spreading rate across layers, the individual spectra of each layer merge with the coupling between layers. Finally, we verified the barrier effect, i.e., for three-layer configuration, when the layer with the largest eigenvalue is located at the center of the line, it can effectively act as a barrier to the disease. The formalism introduced here provides a unifying mathematical approach to disease contagion in multiplex systems opening new possibilities for the study of spreading processes.Comment: Revised version. 25 pages and 18 figure

Maude: specification and programming in rewriting logic

Maude is a high-level language and a high-performance system supporting executable specification and declarative programming in rewriting logic. Since rewriting logic contains equational logic, Maude also supports equational specification and programming in its sublanguage of functional modules and theories. The underlying equational logic chosen for Maude is membership equational logic, that has sorts, subsorts, operator overloading, and partiality definable by membership and equality conditions. Rewriting logic is reflective, in the sense of being able to express its own metalevel at the object level. Reflection is systematically exploited in Maude endowing the language with powerful metaprogramming capabilities, including both user-definable module operations and declarative strategies to guide the deduction process. This paper explains and illustrates with examples the main concepts of Maude's language design, including its underlying logic, functional, system and object-oriented modules, as well as parameterized modules, theories, and views. We also explain how Maude supports reflection, metaprogramming and internal strategies. The paper outlines the principles underlying the Maude system implementation, including its semicompilation techniques. We conclude with some remarks about applications, work on a formal environment for Maude, and a mobile language extension of Maude

El Museo de la Plata

Buena suerte es para el Museo de La Plata que el primer número de la Revista pueda contener, como introducción, el discurso que el profesor Flower, el sabio Director del Museo Británico de Historia Natural y presidente de la Asociación Británica para el adelanto de las ciencias reunida en New Castle, pronuncio en la primera sesión de Septiembre del año pasado.El tema elegido y que nadie mejor que el ex Director del Museo del Colegio Real de Cirujanos de Londres puede tratar, habiendo sido él quien organizó en dicho establecimiento su sección ilustrativa de la anatomía comparada que ha adquirido renombre universal, encierra tanta enseñanza para los que en estos países (donde desgraciadamente son la mayoría), creen que un museo debe ser algo como las colecciones de Juan Tradescant padre e hijo, citadas por el ilustre sabio, es decir, un simple depósito de curiosidades, que ese discurso es un auxiliar poderoso para el Museo de la Provincia, aun embrión, y al cual, sin embargo, se le ha exigido lo que no pueden dar los primeros museos del mundo

Disinfection efficiency of secondary effluents with ultraviolet light in a Mediterranean area

This paper deals with the study of physicochemical and microbiological parameters affecting disinfection efficiency of secondary effluents in a municipal wastewater treatment plant, for irrigation purposes. There appears to be an important increase on turbidity values as chlorine values increases, due to the conversion of particulate organic carbon into dissolved organic carbon. The nitrification-denitrificacion processes appeared to be sensitive to changes in pH, with a minimum nitrate value in the wastewater when pH ranged between 7.01-8.00. With a similar behaviour, the phosphate removal was conditioned by pH, showing the highest efficiency in the same pH range. Both anions probed to be strongly correlated. Total coliforms were more UV light resistant than faecal coliforms, after an exposure of 10 min, corresponding to an UV dose of 73 mJ/cm2. The experimental results for both groups of microorganisms followed first order reaction kinetics, with a gradual flattening at higher UV doses. A total elimination of both indicators would be achieved with doses over 95 mJ/cm2. A previous step on the treated wastewater would improve its quality before the disinfection process

Lijeros apuntes sobre dos géneros de cetáceos fósiles

Ya hemos dicho que en los terrenos terciarios del Paraná, Chubut y Santa Cruz, (RepúblicaArgentina) se han descubierto abundantes restos de cetáceos. Del primer punto, Burmeister hadescripto representantes de dos géneros y de dos especies: Pontistes rectifrous y Saurocetesargentinus al que llamó más tarde Saurodelphis argentinus. Ambos delfines tienen analogía conla Pontoporia actual (Pontoporia Blainvillii Gray)

Terapia familiar y de pareja de ancianos

La revisión bibliográfica que presentamos en este trabajo muestra el creciente interés en relación con la participación de las personas mayores en la terapia familiar y de pareja. Se ponen de relieve las peculiaridades de esta población por los estresores que habitualmente experimentan pero, especial y significativamente, por la capacidad o potencial de cambio que tienen las personas de edad avanzada. Por ello, es preciso que la terapia se ajuste a sus características y los profesionales superen los prejuicios acerca de la inmovilidad y deterioro de la vejez para poder desarrollarla de forma efectiva.Ibis bibliography reuieto íllustrates the increasíng interest related to the elderly share in fa mily and marital therapy. Tbe peculiar way that this popu lation suffers with stressors, and specially, their potencial for changing are emphasized. In consequence, so as to acbieue an effective tberdpeuticat deuelopment, there are two conditions. first, the tberapy needs to fit into the characteristics of the elderly, and second, the professionals need to overcome their prejudices against old age immobility and deterioration

Optimization by Response Surface Methodology (RSM) of the Kharasch−Sosnovsky Oxidation of Valencene

Response surface methodology (RSM) has been employed to model and optimize the Kharasch−Sosnovsky allylic oxidation of valencene. The detailed effects of the amounts of oxidant, substrate, copper catalyst, 1,8- diazabicyclo[5.4.0]undec-7-ene (DBU), and temperature have been studied. The concentration of substrate and quantity of oxidant have been determined as the most significant variables. The interaction effects on the yield have been investigated using a three-level full-factorial design. The yield of benzoyloxyvalencene has been improved to 99%. Analysis of variance (ANOVA) has been used to evaluate the goodness of fit of the model