Post-Newtonian Cosmological Dynamics in Lagrangian coordinates

The non-linear dynamics of irrotational dust in General Relativity is studied in synchronous and comoving coordinates. All the equations are written in terms of the metric tensor of spatial sections orthogonal to the flow, which allows an unambiguous expansion in powers of $1/c^2$. To lowest order, the Newtonian approximation in Lagrangian form is derived. At this level the evolution is governed by the Raychaudhuri equation for the Lagrangian-to-Eulerian Jacobian matrix. The Lagrangian spatial metric reduces to that of Euclidean 3-space in time-dependent curvilinear coordinates. A Lagrangian version of the Bernoulli equation for the evolution of the `velocity potential' is also given. At the post-Newtonian (PN) level, an exact and general formula is derived for gravitational-wave emission from non-linear perturbations. It is shown that, in the anisotropic collapse of homogeneous ellipsoids, the ratio of the PN tensor modes to the Newtonian metric tends to diverge like the mass density. It is finally argued that a stochastic gravitational-wave background is produced, with present-day closure density $\Omega_{gw} \sim 10^{-5}$ -- $10^{-6}$ on $1$ - $10$ Mpc scales.Comment: Revised version accepted for publication in MNRAS. 1 figure added. Latex file, 38 page

Análisis correlacional de las plataformas digitales Chequeado y Ecuador-Chequea entorno a la inteligencia artificial

Journalism and technology have changed the way of interacting with the user; however, for this to happen, professionals in the field have had to adapt to the digital age of the 21st century and with it, to the demands of a society immersed in digital. Within this framework, a phenomenon is born due to misinformation, which, aided by technological immediacy, is disseminated on a large scale through social networks, causing confusion in the verisimilitude of the information, in view of this, Fact-Checking It arises as a methodological response to this phenomenon, since digital journalism has taken another turn of work within digital environments. The present correlational study uses a quantitative and qualitative approach, in addition to using the techniques of content analysis, non-participant observation and interview for data collection. From this, 3 verified contents related to Artificial Intelligence were used within the Instagram platforms of the digital media Chequeado and Ecuador-Chequea. This research shows how the Fact-Checking methodology is applicable for the verification of disinformation content, likewise, it shows the filters and processes that each medium uses to interact with the audience. It should be noted that the categories and qualifications that each medium grants are subject to misinformation content and false news, since there is a difference between these two categories and it is what has set the course in digital journalistic workEl periodismo y la tecnología han cambiado la forma de interactuar con el usuario; sin embargo, para que esto suceda, los profesionales del campo han tenido que adaptarse a la Era digital del siglo XXI y con ello, a las demandas de una sociedad sumergida en lo digital. Dentro de este marco, nace un fenómeno a causa de las desinformaciones, las cuales, ayudadas por la inmediatez tecnológica son difundidas a gran escala a través de las redes sociales, provocando confusión en la verisimilitud de la información, ante ello, el Fact-Checking surge como respuesta metodológica hacia dicho fenómeno, pues el periodismo digital ha dado otro giro de trabajo dentro de los entornos digitales. El presente estudio correlacional utiliza un enfoque cuantitativo y cualitativo, además, de utilizar las técnicas de análisis de contenido, observación no participante y entrevista para la recolección de datos. A partir de ello, se utilizaron 3 contenidos verificados relacionados con la Inteligencia Artificial dentro de las plataformas Instagram de los medios digitales Chequeado y Ecuador-Chequea. Esta investigación muestra cómo la metodología del Fact-Checking es aplicable para la verificación de contenidos desinformativos, asimismo, muestra los filtros y los procesos que cada medio utiliza para interactuar con la audiencia. Cabe señalar que, las categorías y las calificaciones que cada medio otorga, se sujetan a los contenidos desinformativos y a las noticia falsa, pues existe una diferencia entre estas dos categorías y es lo que ha marcado el rumbo en el trabajo periodístico digita

El uso de herramientas virtuales en la enseñanza de la historia en la universidad

For some years now, education has been traversed by the introduction of virtual platforms that supplement classroom training and help customize the blended learning model. Such model is intended to change traditional education, which places the teacher in the role of the only agent of knowledge transmission, and to implement a new paradigm in which the teacher acts as a mediator between knowledge and students. This article is aimed at accounting for a pedagogical experience based on the use of virtual tools at the History of Argentine and Latin American Institutions subject. Such subject is part of the Basic Cycle of the Law Degree at the National University of Cuyo (UNCuyo). The main purpose of the teaching proposal was to reconsider a change in the teaching-learning strategies and open new involvement spaces in the way of communicating knowledge.Desde hace algunos años, la educación ha sido atravesada por la incorporación de plataformas virtuales que complementan las clases presenciales y contribuyen a configurar el modelo de «aprendizaje combinado» o blended learning. Dicho modelo pretende modificar la educación tradicional, que coloca al docente como único agente transmisor del conocimiento, e implementar un nuevo paradigma en el cual este debe ser mediador entre el conocimiento y el estudiante. Este artículo tiene como objetivo dar cuenta de una experiencia pedagógica basada en la aplicación de herramientas virtuales, cuyo escenario fue la cátedra de Historia de la Instituciones Argentinas y Latinoamericanas. El espacio curricular es parte del Ciclo Básico de la carrera de Abogacía de la Universidad Nacional de Cuyo. El principal objetivo de la propuesta didáctica fue repensar un cambio en las estrategias de enseñanza-aprendizaje y abrir nuevos espacios de interpelación en el modo de transmisión de los saberes

Las justicias provinciales en el tránsito entre el fin de la dictadura militar y la apertura democrática: rupturas y continuidades

En los últimos años, nos hemos acercado a una reno vación de los estudios sobre la justicia y el derecho. Dicha renovación se alejó de la mera historia de las leyes, las constituciones y las instituciones judicia les; y otorgó un nuevo protagonismo a los actores y las prácticas, los usos de la ley y su aplicación por legos y letrados. De esta forma la problematización de conceptos, supuestos teóricos y procedimientos de investigación permitió un acercamiento notable a las cuestiones puestas en agenda por la recien te historia política e historia socio-cultural. En ese marco, la Historia de la Justicia se configuró como un quehacer historiográfico abocado más que a las instituciones a sus agentes; a sus representaciones; a su funcionamiento; a sus escenarios, sus útiles y sus condiciones materiales; a la incidencia que su administración y representación pueden tener las distancias y las ausencias; a los modos rituales de gobernar o de resolver conflictos; a su vínculo con las funciones de gobierno y legislación. Ahora bien, corresponde precisar cuándo una historia es social

Las políticas públicas a la luz de los Derechos Humanos: acercamientos a las realidades municipales y regionales de Mendoza. El caso del Gran Mendoza

Comunicación científica en formato ORAL, realizada en las III Jornadas Internacionales de Investigación, Ciencia y Universidad y las XII Jornadas de Investigación UMaza, en el Bloque de comunicaciones científicas: "POLÍTICAS PÚBLICAS DERECHOS HUMANOS Y JURISPRUDENCIA", el mismo fue moderado por la Esp. CAROLINA TOMBA. Las jornadas se llevaron adelante desde 19 al 23 de octubre del 2020 en formato totalmente virtual bajo plataforma Zoom y fueron transmitidas por el canal YouTube de la UMaza y el Facebook del Área de Ciencia y Técnica UMaza (Somos Ciencia y Técnica UMaza)

Magistracy in a province of the argentine interior (Mendoza, 1872-1890)

Este trabajo busca realizar un aporte a la historia social de la justicia a través de enfoques y metodologías sujetos a la actual agenda de investigación sobre las instituciones estatales. Puntualmente, se propone presentar un análisis sobre cómo estaba organizada la justicia de paz en el territorio mendocino entre 1872-1890, un periodo en el que se dictaron las primeras leyes que regularon la administración de la justicia baja en la provincia. En efecto, durante esos años la fisonomía del poder judicial local adquirió mayor cohesión como resultado del desarrollo político e institucional del poder central y provincial. Asimismo, el trabajo centra su atención en quiénes fueron los actores que ejercieron los fueros de paz en la provincia, atendiendo principalmente, a sus perfiles socioocupacionales.This article seeks to contribute to the social history of justice through approaches and methodologies linked to the current research agenda on state institutions. Specifically, it attempts to analyze the way magistracy in Mendoza was organized between 1872-1890, the period when the first laws regulating the administration of low justice in the province were enacted. Indeed, during those years, the local judiciary acquired greater cohesion because of the political and institutional development of the central and provincial power. The article also focuses on the actors who exercised magistracy in the province, mainly exploring their sociooccupational profiles.Fil: Fucili, Eliana Valeria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto de Ciencias Humanas, Sociales y Ambientales; Argentina. Universidad Nacional de Cuyo; ArgentinaFil: Terranova, David German. Universidad Nacional de Cuyo. Facultad de Derecho; Argentina. Universidad "juan Agustin Maza". Facultad de Ciencias Empresariales y Juridicas.; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto de Ciencias Humanas, Sociales y Ambientales; Argentin

Controlling the Lithium Intercalation Voltage in the Li(Mn1–xNix)2O4 Spinel via Tuning of the Ni Concentration: a Density Functional Theory Study

LiMn2O4 spinel is a promising cathode material for secondary lithium-ion batteries. Despite showing a high average voltage of lithium intercalation, the material is structurally unstable, undergoing lowering of the crystal symmetry due to Jahn-Teller distortion of the six-fold Mn3+ cations. Although Ni has been proposed as a suitable substitutional dopant to improve the structural stability of LiMn2O4, and enhance the average lithium intercalation voltage,  the thermodynamics of the Ni incorporation and its effect on the electrochemical properties of this spinel material are not yet known. In this work, we  have employed density functional theory calculations with a Hubbard Hamiltonian (DFT+U) to investigate the thermodynamics of cation mixing in the  Li(Mn1–xNix)2O4 solid solution. Our results suggest LiMn1.5Ni0.5O4 is the most stable composition from room temperature up to at least 1000 K, in  agreement with experiments. We also found that the configurational entropy is much lower than the maximum entropy at 1000 K, indicating that higher  temperatures are required to reach a fully disordered solid solution. A maximum average lithium intercalation voltage of 4.8 eV was calculated for the  LiMn1.5Ni0.5O4 composition, which is very close to the experimental value. The temperature was found to have a negligible effect on the Li intercalation  voltage of the most stable composition. The findings reported here support the application of LiMn1.5Ni0.5O4 as a suitable cathode material for lithium-  ion batteries, with a highly stable voltage of intercalation under a wide range of temperatures.&nbsp

Profiling UK injectable aesthetic practitioners: a national cohort analysis

Introduction: The United Kingdom (UK) injectables market has been growing rapidly with a lack of robust regulation and to date, no information regarding the profile of practitioners has been published. Aim: We aim to provide a descriptive and qualitative analysis of the advertised practitioners in the United Kingdom. Methods: We performed a systematic search using the internet search engine Google to perform a qualitative descriptive analysis of aesthetic practitioners in the UK. For each contiguous country in the UK: England, Scotland, and Wales, five searches were performed. The list of practitioners was then cross-referenced with professional regulatory bodies, with extraction of registration number, date of registration and presence or absence from the Specialist Register or General Practitioner register. Results: 3,000 websites were visited and evaluated. 1,224 independent clinics with 4,405 practitioners were identified. 738 were identified as those in business support functions and the remaining 3,667 practitioners were undertaking injectable practice. The profile of professions were doctors 32%, nurses 13%, dentists 24% and dental nurses 8%. Of the 1,163 doctors identified 481 were on the specialist register (41%) and 219 were on the GP register (19%). 27 specialties were represented in this cohort analysis. Plastic Surgery formed the majority of those who were on the specialist register at 37%, followed by Dermatology at 18%. Conclusion: This paper is the first to describe the range of practitioners, their professional backgrounds and experience who perform non-surgical aesthetic interventions. The range of backgrounds may have an impact on the potential risks to patients and will be an important consideration in proposed legislation to introduce licensing to the industry

Thermodynamics of the Atomic Distribution in Pt3Pd2, Pt2Pd3 and their Corresponding (111) Surfaces

In this study, we have developed solid-state models of platinum and palladium bimetallic catalysts, Pt3Pd2 and Pt2Pd3, which are rapidly thermally  annealed at 800 °C. These models were constructed by determining all the unique atomic configurations in a 2×2×1 supercell, using the program Site-  Occupation Disorder (SOD), and optimized with the General Utility Lattice Program (GULP) using Sutton-Chen interatomic potentials. Each catalyst had  101 unique bulk models that were developed into surface models, which were constructed using the two-region surface technique before the surface  energies were determined. The planes and compositions with lowest surface energies were chosen as the representative models for the surface  structure of the bimetallic catalysts. These representative models will now be used in a computational study of the HyS process for the production of  hydrogen