The Two-Dimensional Bose-Einstein Condensate

We study the Hartree-Fock-Bogoliubov mean-field theory as applied to a two-dimensional finite trapped Bose gas at low temperatures and find that, in the Hartree-Fock approximation, the system can be described either with or without the presence of a condensate; this is true in the thermodynamic limit as well. Of the two solutions, the one that includes a condensate has a lower free energy at all temperatures. However, the Hartree-Fock scheme neglects the presence of phonons within the system, and when we allow for the possibility of phonons we are unable to find condensed solutions; the uncondensed solutions, on the other hand, are valid also in the latter, more general scheme. Our results confirm that low-energy phonons destabilize the two-dimensional condensate.Comment: 8 pages, 3 figures, REVTeX 4. To appear in J. Low Temp. Phys. Corrected a mistake in a calculation and changed the conclusions accordingl

Quasilinear eigenvalues

In this work, we review and extend some well known results for the eigenvalues of the Dirichlet $p-$Laplace operator to a more general class of monotone quasilinear elliptic operators. As an application we obtain some homogenization results for nonlinear eigenvalues.Comment: 23 pages, Rev. UMA, to appea

Universal decoherence induced by an environmental quantum phase transition

Decoherence induced by coupling a system with an environment may display universal features. Here we demostrate that when the coupling to the system drives a quantum phase transition in the environment, the temporal decay of quantum coherences in the system is Gaussian with a width independent of the system-environment coupling strength. The existence of this effect opens the way for a new type of quantum simulation algorithm, where a single qubit is used to detect a quantum phase transition. We discuss possible implementations of such algorithm and we relate our results to available data on universal decoherence in NMR echo experiments

MEDEA: A DSGE Model for the Spanish Economy

In this paper, we provide a brief introduction to a new macroeconometric model of the Spanish economy named MEDEA (Modelo de Equilibrio Dinámico de la Economía EspañolA). MEDEA is a dynamic stochastic general equilibrium (DSGE) model that aims to describe the main features of the Spanish economy for policy analysis, counterfactual exercises, and forecasting. MEDEA is built in the tradition of New Keynesian models with real and nominal rigidities, but it also incorporates aspects such as a small open economy framework, an outside monetary authority such as the ECB, and population growth, factors that are important in accounting for aggregate fluctuations in Spain. The model is estimated with Bayesian techniques and data from the last two decades. Beyond describing the properties of the model, we perform different exercises to illustrate the potential of MEDEA, including historical decompositions, long-run and short-run simulations, and counterfactual experiments.DSGE Models, Likelihood Estimation, Bayesian Methods

Fiscal volatility shocks and economic activity

The authors study the effects of changes in uncertainty about future fiscal policy on aggregate economic activity. Fiscal deficits and public debt have risen sharply in the wake of the financial crisis. While these developments make fiscal consolidation inevitable, there is considerable uncertainty about the policy mix and timing of such budgetary adjustment. To evaluate the consequences of this increased uncertainty, the authors first estimate tax and spending processes for the U.S. that allow for time-varying volatility. They then feed these processes into an otherwise standard New Keynesian business cycle model calibrated to the U.S. economy. The authors find that fiscal volatility shocks have an adverse effect on economic activity that is comparable to the effects of a 25-basis-point innovation in the federal funds rate.Monetary policy ; Fiscal policy ; Uncertainty

Fiscal Volatility Shocks and Economic Activity

We study the effects of changes in uncertainty about future fiscal policy on aggregate economic activity. Fiscal deficits and public debt have risen sharply in the wake of the financial crisis. While these developments make fisscal consolidation inevitable, there is considerable uncertainty about the policy mix and timing of such budgetary adjustment. To evaluate the consequences of this increased uncertainty, we first estimate tax and spending processes for the U.S. that allow for time-varying volatility. We then feed these processes into an otherwise standard New Keynesian business cycle model calibrated to the U.S. economy. We find that fiscal volatility shocks have an adverse effect on economic activity that is comparable to the effects of a 25-basis-point innovation in the federal funds rate.DSGE models, Uncertainty, Fiscal Policy, Monetary Policy

Gestión pedagógica y su relación con la comprensión lectora en las estudiantes del 3er grado de la IE. “Esther Cáceres Salgado” de la UGEL 02

La investigación titulada Gestión pedagógica y su relación con la comprensión lectora en las alumnas del 3er grado de la IE. “Esther Cáceres Salgado” de la UGEL 02, presentó como propósito establecer la relación entre la gestión pedagógica y la comprensión lectora de las estudiantes en la IE. “Esther Cáceres Salgado” de la UGEL 02. Esta investigación empleo la metodología hipotético deductiva, bajo una perspectiva cuantitativa dentro de un paradigma positivista, el modelo de investigación fue sustantiva de nivel descriptivo – correlacional con un diseño no experimental, transversal. La población fue conformada por 496 colaboradores (estudiantes). Se utilizó el muestreo no probabilístico, quedando establecido como muestra 100 colaboradores. Se empleó el método de la encuesta y su herramienta el cuestionario para la gestión pedagógica y también para la comprensión lectora, con interrogantes modelo Escala de Likert. Para la confiabilidad de los instrumentos se utilizó el Alpha de Cronbach para ambos instrumentos. Se determinó que existe una relación entre la gestión pedagógica y la comprensión lectora de las estudiantes del 3er grado de la IE. “Esther Cáceres Salgado” de la UGEL 02, debido a que el nivel de significancia calculada es p ≤.05 y el coeficiente de correlación de Rho de Spearman tiene un valor de ,818 siendo una correlación positiva alta

Sistema de gestión del consumo en tiempo real en balones de gas licuado de petróleo en Lima

Desde el inventó de la cocina en el siglo XIX, por James Sharp en Inglaterra, siempre se ha tenido la necesidad de procurar un abastecimiento continuo de combustible para mantenerla en uso. Algunas familias en el mejor escenario pueden procurarse 02 balones de gas, para garantizar un funcionamiento continuo; sin embargo, la mayoría de las familias sólo tienen por opción que éste se termine y deban reemplazarlo, sometiéndose al tiempo y stock del distribuidor. Por otro lado, los balones de gas representan un peligro, por las posibles fugas que suelen producirse por descuido o por un deficiente mantenimiento de las instalaciones, lo cual puede representar muertes por asfixia, intoxicación por inhalar monóxido de carbono, incendios y explosiones. Ante la precitada problemática, se ha conceptualizado una solución compuesta por un dispositivo, que comprende sensores acoplados al regulador de la cocina, brindando el nivel de gas y posibles fugas, esta información viaja al microcontrolador para el procesamiento de los datos, para luego ser enviada a los servidores en la nube, esto último con la finalidad de generar en el tiempo líneas de tendencia que permitan predecir el consumo del usuario. Los tópicos usados en el desarrollo del proyecto fueron: •Gestión del Proyecto tomando en cuenta las restricciones en el alcance, tiempo y presupuesto. •Gestión de la Información, para el manejo y diseño de la base de datos. •Diseño y Análisis de Sistemas, para la conceptualización detallada de la solución. •Desarrollo y despliegue de sistemas, para entender cómo deben implementarse las diferentes fases y realizar su respectivo despliegue. •Seguridad de la información, implementación de técnicas de seguridad y protocolos de comunicación. Resultado de las pruebas realizadas, se validaron el hardware y software propuestos, y se evidenció una oportunidad debido a la diversidad de sensores y aplicaciones que se les puedan dar.Ever since the stove was invented in the 19th century by James Sharp in England, there has always been a need to provide a continuous supply of fuel to keep it in use. Families in the best of scenarios can procure 02 gas cylinders, to guarantee the uninterrupted operation of their kitchen service; however, in most cases, families only have the option that it is finished and must be replaced, subject to the availability of time and stock of the distributor. On the other hand, it is known that gas balloons represent a danger, due to the possible leaks that usually occur due to carelessness or poor maintenance installations, which can represent deaths from suffocation, poisoning from inhaling monoxide carbon, fires and explosions. Given the aforementioned problem, uninterrupted supply and danger of gas leaks, a solution has been conceptualized. The proposed device comprises sensors that are attached to the kitchen regulator, providing the level of the gas balloon and possible leaks, this information travels to the microcontroller for data processing and then it will be sent to servers in the cloud, this in order to be able to generate trend lines over time that allow predicting user consumption. The topics used to develop the project were: •Project Management taking into account restrictions in scope, time and budget. • Information Management in order to design and manage the database. •Systems Analysis and Design in order to get detailed conceptualization of the solution. •Development and deployment of systems in order to understand the different modules should be develop and how to deploy them. •Secure computing in order to develop security techniques and communication protocols. As a result of the tests, the proposed hardware and software were validated as well as opportunities were also evidenced due to the diversity of sensors and applications

Procesamiento de datos y desempeño laboral en el área contable de la UGEL de Lima Metropolitana, 2021

El desempeño laboral refleja muchos aspectos importantes que dependen del crecimiento, expansión y producción de la empresa. A nivel nacional, en el Perú se han implementado sistemas eficientes para contar con profesionales adecuados que ocupen puestos apropiados considerando las competencias y capacidad de desempeñarse adecuadamente. A nivel local, para la Unidad de Gestión Educativa Local (UGEL) de Lima Metropolitana el área contable es muy importante, por ello, se tuvo como objetivo general determinar la relación entre el procesamiento de datos y el desempeño laboral en el área contable de la Unidad de Gestión Educativa Local de Lima Metropolitana, 2021. En cuanto a la metodología fue cuantitativa y correlacional de diseño no experimental. Se encontró que la relación entre el procesamiento de datos y el desempeño laboral en el área contable de la UGEL de Lima Metropolitana, posee una relación lineal-positiva y significativa, dado su coeficiente de correlación (0,950). Concluyendo con que, el manejo de los datos tiene un impacto importante en el desempeño de la empresa por lo que debe ser atendido y mejorado de forma continua

Civil aspects of the judicial sale of real unmovable property in Italy and Spain

La tesi di dottorato ha come oggetto di studio gli aspetti sostanziali della vendita giudiziale da un punto di vista comparatistico tra Spagna e Italia. Si tratta di un tema che non è stato analizzato profondamente dalle più recenti dottrine spagnola e italiana, che è caratterizzato da una notevole complessità tecnica visto il suo forte carattere interdisciplinare (in particolare, processuale-sostanziale) e la cui vigenza attuale è stata intensificata dalla grande quantità di processi di esecuzione che in questo periodo di instabilità economica sono una constante nei Tribunali spagnoli e italiani. Il fatto che costituisca un’istituzione giuridica inquadrata nell’ambito del processo di espropriazione forzata fa sì che questa possieda un accentuato carattere processuale e, infatti, è il legislatore processuale che si occupa per la maggior parte del suo regime giuridico. Tuttavia, al di là di questa sua natura evidentemente processuale, essa produce una serie di effetti sostanziali di enorme importanza, che sono proprio l’oggetto della tesi di dottorato, nello specifico ambito dei beni immobili (considerando la grande importanza economica e pratica dei diritti di questa natura nella nostra realtà socio-economica).The PhD thesis seeks the study of the civil aspects of the judicial sale from a comparative point of view between Italy and Spain. It is a subject which hasn't been deeply analyzed by the recent Italian and Spanish doctrine, and which is characterized by a considerable technical complexity due to its interdisciplinary nature (mainly, procedural and civil). It is also a current issue in this period of economic crisis in which foreclosure processes are a day by day reality of our Courts. The fact of being an institution framed in the foreclosure process outlines its procedural nature, but that cannot hide the fact of producing important civil effects of great importance which are precisely the aim of the PhD thesis