Effect of long range spatial correlations on the lifetime statistics of an emitter in a two-dimensional disordered lattice

The effect of spatial correlations on the Purcell effect in a bidimensional dispersion of resonant nanoparticles is analyzed. We perform extensive calculations on the fluorescence decay rate of a point emitter embedded in a system of nanoparticles statistically distributed according to a simple 2D lattice-gas model near the critical point. For short-range correlations (high temperature thermalization) the Purcell factors present a long-tailed statistic which evolves towards a bimodal distribution when approaching the critical point where the spatial correlation length diverges. Our results suggest long-range correlations as a possible origin of the large fluctuations of experimental decay rates in disordered metal films.Comment: 6 pages, 5 figure

Impact of two yeast strains on tempranillo red wine aroma profiles throughout accelerated ageing

This study aimed at determining the changes induced by two S. cerevisiae strains, (IONYS wf™ and Lalvin ICV D254™) on the sensory and chemical aroma profiles of Tempranillo wine, after fermentation and after ageing. The 64 aroma molecules determined were grouped attending to sensory and chemical similarity into 17 aroma vectors. Sensory studies included a sorting task and a descriptive analysis by flash profile with a trained panel. Results revealed that, even if ageing is the dominant factor, the strain of yeast introduces significant and consistent differences, both in sensory and aroma vector profiles (11 out 17 affected). Wines made with D254 contained higher levels of ethyl esters, acetic acid, cinnamates and ethyl acetate and lower levels of linear fatty acids, ß-damascenone, acetaldehyde, higher alcohols and lactones than those made with IONYS. The first profile was related to black and fresh fruit notes, while the second to white and compote fruits. © 2021 International Viticulture and Enology Society-IVES

Crecimiento de las tilapias oreochromis niloticus en cultivo monosexual y ambos sexos, en sistemas de producción semi – intensivos

Target. To compare the population parameters of Oreochromis niloticus tilapias grown in Monosexual and Both-sex cultures in semi-intensive production systems. Materials and methods. To determine which treatment obtained the highest growth, physical-chemical factors (Dissolved Oxygen, Temperature) and population parameters (Accumulated Growth, Survival and Feed Conversion Factor) were taken. Collecting these data for 25 days where the Tilapia Oreochromis niloticus had an initial weight of 77.43gr in both treatments. Results. According to the results obtained in the experiment, the monosexual treatment acquired a final growth of 135.42gr, obtaining an average of 57.99 gr, while the treatment of both sexes reached a final growth of 112.73gr, achieving an average of 35.3 gr. Conclution. The monosexual treatment gained greater size and biomass in less time since they only dedicated themselves to feeding, on the other hand in the treatment of both sexes they gained little biomass since the ingested food was used for the preparation of sexual maturation and thus enter the reproductive stage, which decreased its growth rate, when applying the statistical analysis it was found that p>0.05 alleging that the growth of Tilapia Oreochromis niloticus is greater when only males are cultivated.  Objetivo. Comparar los parámetros poblacionales de las tilapias Oreochromis niloticus que crecen en cultivos Monosexuales y Ambos sexos en sistemas de producción semi-intensivos. Materiales y Métodos. Para determinar que tratamiento obtuvo mayor crecimiento se realizó la toma de factores físico-químicos (Oxígeno Disuelto, Temperatura) y parámetros poblacionales (Crecimiento Acumulado, Sobrevivencia y Factor de Conversión Alimenticia). Recolectando estos datos durante 25 días donde las Tilapias Oreochromis niloticus tuvieron un peso inicial de 77.43gr en ambos tratamientos. Resultados. Según los resultados obtenidos en el experimento, el tratamiento monosexual adquirió un crecimiento final de 135.42gr obteniendo como promedio 57.99 gr en cambio el tratamiento de ambos sexos alcanzó un crecimiento final de 112.73gr logrando un promedio de 35.3 gr. Conclusión. El tratamiento monosexual gano mayor tamaño y biomasa en menor tiempo dado que estos solamente se dedicaron  a alimentarse, en cambio en el tratamiento de ambos sexos gano poca biomasa ya que el alimento ingerido lo ocuparon para la preparación de la maduración sexual y así entrar a la etapa de reproducción, lo que disminuyo su velocidad de crecimiento, al aplicar los análisis estadísticos se encontró que p>0.05 alegando que el crecimiento de las Tilapias Oreochromis niloticus es mayor cuando solo se cultivan machos

Diagnóstico de transformadores mediante análisis de respuesta por barrido de frecuencia (SFRA)

El método de análisis de respuesta por barrido de frecuencia SFRA (SweepFrequency Response Analysis), es una técnica de diagnóstico para detectar deformaciones y desplazamientos (entre otras fallas eléctricas y mecánicas) sobre los devanados en transformadores. La detección del problema se traduce directamente en el tipo de mantenimiento que se debe realizar.

Statistical Scattering of Waves in Disordered Waveguides: from Microscopic Potentials to Limiting Macroscopic Statistics

We study the statistical properties of wave scattering in a disordered waveguide. The statistical properties of a "building block" of length (delta)L are derived from a potential model and used to find the evolution with length of the expectation value of physical quantities. In the potential model the scattering units consist of thin potential slices, idealized as delta slices, perpendicular to the longitudinal direction of the waveguide; the variation of the potential in the transverse direction may be arbitrary. The sets of parameters defining a given slice are taken to be statistically independent from those of any other slice and identically distributed. In the dense-weak-scattering limit, in which the potential slices are very weak and their linear density is very large, so that the resulting mean free paths are fixed, the corresponding statistical properties of the full waveguide depend only on the mean free paths and on no other property of the slice distribution. The universality that arises demonstrates the existence of a generalized central-limit theorem. Our final result is a diffusion equation in the space of transfer matrices of our system, which describes the evolution with the length L of the disordered waveguide of the transport properties of interest. In contrast to earlier publications, in the present analysis the energy of the incident particle is fully taken into account.Comment: 75 pages, 10 figures, submitted to Phys. Rev

Aerial mapping and multi-sensors approaches from remote sensing applied to the roman archaeological heritage

This report details the preliminary results of the research focused on Roman archaeological heritage in the Middle Ebro Valley (Spain). The principal objective of this project was to obtain several different readings by means of a UAV equipped with different sensors. Firstly, it has been possible to obtain accurate maps, 3D models and digital elevation models of the site. Secondly, it has been possible to investigate and define archaeological remains still underground, via a new methodology which utilises visible and near-infrared wavelengths

Effects of different arachidonic acid supplementation on psychomotor development in very preterm infants; A randomized controlled trial

Background & aims: Nutritional supplementation with polyunsaturated fatty acids is important in preterm infants neurodevelopment, but it is not known if the omega-6/omega-3 ratio affects this process. This study was designed to determine the effects of a balanced contribution of arachidonic acid in very preterm newborns fed with formula milk. Methods: This was a randomized trial, in which newborns <1500 g and/or <32 weeks gestational age were assigned to one of two groups, based on the milk formula they would receive during the first year of life. Initially, 60 newborns entered the study, but ultimately, group A was composed of 24 newborns, who were given formula milk with an ω-6/ ω-3 ratio of 2/1, and Group B was composed of 21 newborns, given formula milk with an ω-6/ω-3 ratio of 1/1. The infants were followed up for two years: growth, visual-evoked potentials, brainstem auditory-evoked potentials, and plasma fatty acids were periodically measured, and psychomotor development was assessed using the Brunet Lézine scale at 24 months corrected age. A control group, for comparison of Brunet Lézine score, was made up of 25 newborns from the SEN1500 project, who were fed exclusively with breast milk. Results: At 12 months, arachidonic acid values were significantly higher in group A than in group B (6.95 ± 1.55 % vs. 4.55 ± 0.78 %), as were polyunsaturated fatty acids (41.02 ± 2.09 % vs. 38.08 ± 2.32 %) achieved a higher average. Group A achieved a higher average Brunet Lézine score at 24 months than group B (99.9 ± 9 vs. 90.8 ± 11, p =0.028). The Brunet Lézine results from group A were compared with the control group results, with very similar scores registered between the two groups (99.9 ± 9 vs. 100.5 ± 7). There were no significant differences in growth or evoked potentials between the two formula groups. Conclusions: Very preterm infants who received formula with an ω-6/ω-3 ratio of 2/1 had higher blood levels of essential fatty acids during the first year of life, and better psychomotor development, compared with very preterm newborns who consumed formula with an ω-6/ω-3 of 1/1. Therefore, formula milk with an arachidonic acid quantity double that of docosahexaenoic acid should be considered for feeding very preterm infants

Comparison in the aplication of the exploitation by optimal head model to hydroelectronic power station in run-of-the-river systems equipped with different types of turbines

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