A Note on the Generalized Friedmann Equations for a Thick Brane

Within our thick brane approach previously used to obtain the cosmological evolution equations on a thick brane embedded in a five-dimensional Schwarzschild Anti-de Sitter spacetime it is explicitly shown that the consistency of these equations with the energy conservation equation requires that, in general, the thickness of the brane evolves in time. This varying brane thickness entails the possibility that both Newton's gravitational constant $G$ and the effective cosmological constant $\Lambda_4$ are time dependent.Comment: 6 pages,To appear in GR

Revisión de métodos desarrollados para evaluar aromaticidad en los compuestos heterocíclicos.

La aromaticidad ha sido uno de los paradigmas más importantes en química. Aunque la aromaticidad es difícil de definir y cuantificar; existe un consenso sobre su significado, que está relacionado con la estabilidad, la estructura, las propiedades magnéticas y la reactividad de muchos compuestos orgánicos e inorgánicos. Sin embargo, su cuantificación es más complicada, pues no existe una “unidad de aromaticidad” y, además, esta propiedad se manifiesta de diversas maneras, dando lugar a diferentes escalas basadas en criterios energéticos, estructurales o magnéticos. El concepto de heteroaromaticidad ha sido formulado como un conjunto de hipótesis teóricas relacionadas con el efecto del heteroátomo en las propiedades aromáticas de heterociclos. Los criterios más importantes de heteroaromaticidad se discuten en esta revisión sobre la base de este concepto.Abstract. Aromaticity has been one of the most important paradigms in Chemistry. Although aromaticity is difficult to define and quantify; it is generally accepted that it refers to stability, structure, magnetic properties and reactivity of many organic and inorganic compounds. However, its quantification is more problematic since there is not any “aromaticity unit” and this property is manifested in several ways; resulting in a variety of scales based on energetic, structural or magnetic criteria. The concept of heteroaromaticity has been formulated as a set of theoretical hypotheses related to the effect of the heteroatom on the aromatic properties of heterocycles. The most important criteria for heteroaromaticity are discussed in this review on the basis of this concept.Maestrí

Redes sociales y las estrategias de promoción de la empresa gestión integral de Proyectos HQSE SAC San Martín de Porres, 2022

La investigación realizada tuvo como objetivo determinar la relación entre las redes sociales y estrategias de promoción. Asimismo, la metodología empleada es de tipo aplicada, de enfoque cuantitativo con diseño no experimental de corte transversal, descriptivo correlacional. Del mismo modo, la población aleatoria simple estuvo conformada por 176 estudiantes; a quienes se les aplico el cuestionario en función a las variables de estudio, el mismo cumplió con los requisitos de validez por juicio de expertos y la confiabilidad en donde los resultados fueron aceptables. Para la contrastación de hipótesis se utilizó la correlación Rho de Spearman, los resultados obtenidos fue que las redes sociales se relacionan con las estrategias de promoción, con un nivel de correlación positivo moderado (Rho de Spearman .550 y p valor 0.01)

Effect of wheat pearling process on composition and nutritional profile of flour and its bread-making performance

Pearling process on wheat grains was evaluated as a strategy to reduce their adverse effect on whole-wheat bread (WWB) quality and simultaneously preserve part of the nutrients of the whole grain. The grains were pearled applying different times (25, 125, 225 and 250 s) before milling. Characteristic, nutritional composition and rheology of the pearled wheat flour (P), and their bread-making performance, were analysed. Whole-wheat flour and refined flour (RF) were used as control. P125s, P225s and P250s exhibited a superior nutritional profile concerning RF. P had lower water absorption and led to higher volume bread with lighter crust and crumb compared to WWB. P125s, P225s and P250s bread showed characteristics similar to those of white bread, but their hardness was lower. The improvement resulted from the extraction of the outermost bran layers, a decrease in insoluble dietary fibre, an increase in the proportion of water-soluble pentosans and a lower protein weakening.Fil: Navarro, José Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Ciencia y Tecnología de Alimentos Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Ciencia y Tecnología de Alimentos Córdoba; ArgentinaFil: Biglione, Camila. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Ciencia y Tecnología de Alimentos Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Ciencia y Tecnología de Alimentos Córdoba; ArgentinaFil: Paesani, Candela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Ciencia y Tecnología de Alimentos Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Ciencia y Tecnología de Alimentos Córdoba; ArgentinaFil: Moiraghi, Malena. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Cátedra de Química Biológica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Ciencia y Tecnología de Alimentos Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Ciencia y Tecnología de Alimentos Córdoba; ArgentinaFil: Leon, Alberto Edel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Ciencia y Tecnología de Alimentos Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Ciencia y Tecnología de Alimentos Córdoba; Argentina. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Cátedra de Química Biológica; ArgentinaFil: Steffolani, Maria Eugenia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Ciencia y Tecnología de Alimentos Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Ciencia y Tecnología de Alimentos Córdoba; Argentina. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias. Cátedra de Química Biológica; Argentin

Nivel de participación parental por medio de clases virtuales en la I.E.I 507 - Yangas, Lima, 2021

La presente investigación titulada Nivel de participación parental por medio de clases virtuales en la I.E.I 507 - Yangas, Lima, 2021 tuvo como objetivo general: Evaluar el nivel de participación parental por medio de clases virtuales en la I.E.I 507 – Yangas, Lima, 2021, para esto se empleó un enfoque cuantitativo de tipo básica, aplicada en una población de 80 padres de la I.E.I 507 Yangas, Lima., de los cuales se seleccionó como muestra a su totalidad. Para la recolección de datos se utilizó la técnica de la encuesta utilizando un cuestionario como instrumento, de la cual se obtuvo como resultado que se observa por medio de este cuadro estadístico que un 11,25 % de los encuestados para la realización de esta prueba se encuentra en un nivel bajo, seguido de un 36,25 % ubicado en el nivel medio y finalmente un 52.5 % en un nivel alto, por tanto, se puede concluir que la mayoría de participantes se encuentra en un nivel alto de participación parental

Propuesta de mejora de la gestión de almacén para reducir costos logísticos en una empresa constructora, Trujillo 2022

La investigación titulada propuesta de mejora de la gestión de almacén para reducir costos logísticos en la empresa constructora, Trujillo 2022. El objetivo general es proponer la mejora de la gestión de almacén para reducir los costos logísticos en la empresa constructora, Trujillo 2022. En esta investigación se van a procesar información numérica como los costos logísticos y datos estadísticos que servará para comprobar la hipótesis. La investigación con enfoque cuantitativo, aplicada y no experimental, considerando como población serán los procesos logísticos de la empresa Constructora, seleccionada para la investigación. De los resultados se encontró que el promedio del valorizado del stock sin movimiento es de S/ 87861. El valor objetivo del inventario sin movimiento es de 12%, sin embargo, se encuentra en el 15.8% en promedio. Se encontró que el valor máximo de las compras urgentes fue de S/ 9453 y el valor mínimo fue de S/ 5897. Se presenta una problemática dado que hay un exceso de los costos en un promedio del 7.2% planificad

Using globular clusters to test gravity in the weak acceleration regime

We have carried out a study of the velocity dispersion of the stars in the outskirts of the globular cluster Omega Centauri, finding that the velocity dispersion remains constant at large radii rather than decrease monotonically. The dispersion starts to be constant for an acceleration of gravity of a = 2.1e-8 cm/s/s. A similar result is obtained reanalyzing existing data for the globular cluster M15 where the profile flattens out for a = 1.7e-8 cm/s/s. In both cases the acceleration is comparable to that at which the effect of dark matter becomes relevant in galaxies. Explanations for this result within Newtonian dynamics exist (e.g. cluster evaporation, tidal effects, presence of dark matter) but require ad hoc tuning of the relevant parameters in order to make in both clusters the dispersion profile flat starting exactly at the same acceleration. We suggest that this result, together with a similar one for Palomar 13 and the anomalous behavior of spacecrafts outside the solar system, may indicate a breakdown of Newton's law in the weak acceleration regime. Although not conclusive, these data prompt for the accurate determination of the internal dynamics of as many GCs as possible.Comment: Accepted for publication on A&A Letters. Four pages + 2 figure

Multimedia delivery in the future internet

The term “Networked Media” implies that all kinds of media including text, image, 3D graphics, audio and video are produced, distributed, shared, managed and consumed on-line through various networks, like the Internet, Fiber, WiFi, WiMAX, GPRS, 3G and so on, in a convergent manner [1]. This white paper is the contribution of the Media Delivery Platform (MDP) cluster and aims to cover the Networked challenges of the Networked Media in the transition to the Future of the Internet. Internet has evolved and changed the way we work and live. End users of the Internet have been confronted with a bewildering range of media, services and applications and of technological innovations concerning media formats, wireless networks, terminal types and capabilities. And there is little evidence that the pace of this innovation is slowing. Today, over one billion of users access the Internet on regular basis, more than 100 million users have downloaded at least one (multi)media file and over 47 millions of them do so regularly, searching in more than 160 Exabytes1 of content. In the near future these numbers are expected to exponentially rise. It is expected that the Internet content will be increased by at least a factor of 6, rising to more than 990 Exabytes before 2012, fuelled mainly by the users themselves. Moreover, it is envisaged that in a near- to mid-term future, the Internet will provide the means to share and distribute (new) multimedia content and services with superior quality and striking flexibility, in a trusted and personalized way, improving citizens’ quality of life, working conditions, edutainment and safety. In this evolving environment, new transport protocols, new multimedia encoding schemes, cross-layer inthe network adaptation, machine-to-machine communication (including RFIDs), rich 3D content as well as community networks and the use of peer-to-peer (P2P) overlays are expected to generate new models of interaction and cooperation, and be able to support enhanced perceived quality-of-experience (PQoE) and innovative applications “on the move”, like virtual collaboration environments, personalised services/ media, virtual sport groups, on-line gaming, edutainment. In this context, the interaction with content combined with interactive/multimedia search capabilities across distributed repositories, opportunistic P2P networks and the dynamic adaptation to the characteristics of diverse mobile terminals are expected to contribute towards such a vision. Based on work that has taken place in a number of EC co-funded projects, in Framework Program 6 (FP6) and Framework Program 7 (FP7), a group of experts and technology visionaries have voluntarily contributed in this white paper aiming to describe the status, the state-of-the art, the challenges and the way ahead in the area of Content Aware media delivery platforms

Biomarkers of postharvest resilience: unveiling the role of abscisic acid in table grapes during cold storage

Table grapes are considered non-climacteric fruit, not showing a rapid increase in respiration rate and ethylene production during ripening. Previous research has suggested that abscisic acid (ABA) may have a more crucial role in grape postharvest behaviour. This study aimed to identify biomarkers of postharvest resilience and flavour life of imported table grapes. An experiment was designed to determine i) the role of ABA and catabolites on grape berry senescence; ii) the spatial distribution of these hormones within the grape berry, and iii) the effect of 1-MCP and storage temperature on its postharvest quality. Hence, the use of an ethylene inhibitor, 1-methylcyclopropane (1-MCP), during table grape storage was investigated. Table grapes (Vitis vinifera L.) cv. ‘Krissy’ were subjected to i) control (untreated); and ii) 1-MCP (1 µL L-1; 12 hours; 15°C) and stored under two scenarios: i) 15 days at 0.5°C, followed by five days at 5.5°C to simulate shelf-life; and ii) 20 days at 5.5°C to simulate a higher storage temperature followed by shelf-life. Physiological (i.e. mould incidence, skin colour, firmness, respiration rate) and biochemical analysis (i.e. individual sugars, organic acids, abscisic acid and catabolites) were performed. Grapes subjected to 5.5°C showed significantly higher mould incidence at the end of the shelf-life compared to 0.5°C storage temperature (12.6% vs. 3.1%). Also, and for the first time, the spatial distribution of ABA during the senescence of table grapes was profiled; the distal section had three times more ABA and metabolites than the proximal. We demonstrated that senescence processes were initiated after a significant increase in respiration rate (from 1 to 2.8 mL CO2 kg-1 h-1), and that ABA could be considered a biomarker for table grapes senescence, since an ABA peak preceded the increase in respiration rate, mould incidence, organic acids, and sucrose hydrolysis during postharvest storage; and coincided with a decrease in berry firmness. These findings are of significant importance for the industry as understanding how ABA regulates both senescence processes and quality changes during postharvest cold storage of tables grapes can improve the consistency and reduce waste and consumer complaints