Generalized MSTB Models: Structure and kink varieties

In this paper we describe the structure of a class of two-component scalar field models in a (1+1) Minkowskian space-time which generalize the well-known Montonen-Sarker-Trullinger-Bishop -hence MSTB- model. This class includes all the field models whose static field equations are equivalent to the Newton equations of two-dimensional type I Liouville mechanical systems with a discrete set of instability points. We offer a systematic procedure to characterize these models and to identify the solitary wave or kink solutions as homoclinic or heteroclinic trajectories in the analogous mechanical system. This procedure is applied to a one-parametric family of generalized MSTB models with a degree-eight polynomial as potential energy density.Comment: 46 pages, 18 figures, corrected typo

Lorentz-violating effects on topological defects generated by two real scalar fields

The influence of a Lorentz-violation on soliton solutions generated by a system of two coupled scalar fields is investigated. Lorentz violation is induced by a fixed tensor coefficient that couples the two fields. The Bogomol'nyi method is applied and first-order differential equations are obtained whose solutions minimize energy and are also solutions of the equations of motion. The analysis of the solutions in phase space shows how the stability is modified with the Lorentz violation. It is shown explicitly that the solutions preserve linear stability despite the presence of Lorentz violation. Considering Lorentz violation as a small perturbation, an analytical method is employed to yield analytical solutions.Comment: (9 pages, 11 figures

Temperature Effects in Automotive-Grade High Speed Interconnects (poster)

This work discerns the frequency response (up to 15 GHz) of several automotive-grade microstrip transmission line structures over a temperature span from -40 to 105 Celsius degrees. To ensure precise measurements, S-parameter responses from several test PCBs based on Cu over FR4 substrate are attained through a vector network analyzer in a controlled environment. Results show that temperature has a major impact on these high speed interconnects in frequencies above a few GHz, setting the need of employing accurate multi-physical models

Defect structures in sine-Gordon-like models

We investigate several models described by real scalar fields, searching for topological defects. Some models are described by a single field, and support one or two topological sectors, and others are two-field models, which support several topological sectors. Almost all the defect structures that we find are stable and finite energy solutions of first-order differential equations that solve the corresponding equations of motion. In particular, for the double sine-Gordon model we show how to find small and large BPS solutions as deformations of the BPS solution of the $\phi^4$ model. And also, for most of the two field models we find the corresponding integrating factors, which lead to the complete set of BPS solutions, nicely unveiling how they bifurcate among the several topological sectors.Comment: RevTex, 18 pages, 17 figures; Version to appear in Physica

Fondos documentales del Archivo Parroquial de la Iglesia Católica San Pedro y San Pablo de Corralillo

The ecclesiastical church archives in Cuba generally safeguard information sources of great antiquity, framed in the colonial period. The Catholic Church “San Pedro y San Pablo” of Corralillo custody documents dating from the eighteenth and nineteenth century, where is a part of the local and national memory. The archive lacks a study that identifi es the documentary sources that holds and the progressive deterioration to which they are subjected. The institution lacks a diagnosis of documentary conservation designed to identify the main factors affecting the documents. Are presented as objectives of the study to identify the documentary collection of Ecclesiastical Archive “San Pedro y San Pablo” of Corralillo Catholic Church and diagnose the condition of the fi le collections. Is detected a progressive deterioration in documents with high heritage value which are affected by biological, chemical, environmental and physical-mechanical factor

Fondos documentales del Archivo Parroquial de la Iglesia Católica San Pedro y San Pablo de Corralillo

Los archivos eclesiásticos en Cuba generalmente atesoran fuentes de información de gran antigüedad, enmarcadas en el período de la colonia. La Iglesia Católica “San Pedro y San Pablo” de Corralillo custodia documentos que datan del siglo xviii y xix, donde se encuentra una parte de la memoria local y nacional. El Archivo carece de un estudio que documente las fuentes documentales que atesora y el deterioro progresivo al que están sometidas. La institución carece de un diagnóstico de conservación documental orientado a la identifi cación de los principales factores que inciden en los documentos. Se plantean como objetivos del estudio, identifi car el fondo documental del Archivo Parroquial de la Iglesia Católica “San Pedro y San Pablo” de Corralillo y diagnosticar el estado de conservación de las colecciones del archivo. Se detecta un deterioro progresivo en los documentos con alto valor patrimonial donde inciden factores biológicos, químicos, ambientales y físico-mecánicos

Fondos documentales del Archivo Parroquial de la Iglesia Católica “San Pedro y San Pablo” de Corralillo

The ecclesiastical church archives in Cuba generally safeguard information sources of great antiquity, framed in the colonial period. The Catholic Church “San Pedro y San Pablo” of Corralillo custody documents dating from the eighteenth and nineteenth century, where is a part of the local and national memory. The archive lacks a study that identifies the documentary sources that holds and the progressive deterioration to which they are subjected. The institution lacks a diagnosis of documentary conservation designed to identify the main factors affecting the documents. Are presented as objectives of the study to identify the documentary collection of Ecclesiastical Archive “San Pedro y San Pablo” of Corralillo Catholic Church and diagnose the condition of the file collections. Is detected a progressive deterioration in documents with high heritage value which are affected by biological, chemical, environmental and physical-mechanical factors.Los archivos eclesiásticos en Cuba generalmente atesoran fuentes de información de gran antigüedad, enmarcadas en el período de la colonia. La Iglesia Católica “San Pedro y San Pablo” de Corralillo custodia documentos que datan del siglo xviii y xix, donde se encuentra una parte de la memoria local y nacional. El Archivo carece de un estudio que documente las fuentes documentales que atesora y el deterioro progresivo al que están sometidas. La institución carece de un diagnóstico de conservación documental orientado a la identificación de los principales factores que inciden en los documentos. Se plantean como objetivos del estudio, identificar el fondo documental del Archivo Parroquial de la Iglesia Católica “San Pedro y San Pablo” de Corralillo y diagnosticar el estado de conservación de las colecciones del archivo. Se detecta un deterioro progresivo en los documentos con alto valor patrimonial donde inciden factores biológicos, químicos, ambientales y físico-mecánicos

Análisis de las Tesis de Maestría de amplio acceso del Centro de Estudios de Educación Superior

El programa de maestría de amplio acceso en ciencias pedagógicas favorecía que cualquier profesional pudiera acceder al programa. El Centro de Estudios de Educación Superior de la Universidad Central “Marta Abreu” de Las Villas tuvo una amplia producción científica a partir del programa de maestría de amplio acceso en ciencias pedagógicas. Se plantean como objetivo del estudio examinar la producción científica del programa de maestría de amplio acceso atendiendo a las temáticas de las tesis, tutores y años más productivos. Para la obtención de resultados se emplean métodos en los niveles teórico y empírico, destacándose el método bibliométrico

Afrontamiento y autoestima en embarazadas con riesgo de parto prematuro

Introducción: la condición psicológica de la mujer durante su embarazo y las formas en que se ve a sí misma, a su bebé y los que la rodean puede facilitar información acerca de la naturaleza y gravedad de los problemas físicos y psiquiátricos probables durante y ulteriores al parto. Objetivo: describir el afrontamiento y la autoestima en embarazadas con riesgo de parto prematuro ingresadas en el Hogar Materno ¨Justo León Padilla¨ entre septiembre de 2012 a febrero de 2013. Métodos: se realizó una investigación observacional, descriptiva, de corte trasversal, en el período comprendido entre septiembre de 2012 a febrero de 2013 en el Hogar Materno ¨Justo León Padilla, se empleó un universo de 62 embarazadas con riesgo de parto prematuro, estudiándose en su totalidad. Se utilizó la estadística descriptiva para el procesamiento de los datos encontrados, se respetó la identidad de las pacientes, se obtuvo el consentimiento informado. Resultados: la mayor cantidad de gestantes con riesgo de parto prematuro son adolescentes entre 16 y 20 años de edad. Predominan las amas de casa, y el nivel profesional secundaria. Conclusiones: la condición psicológica de la mujer cuando está en período de gestación suele modificarse por aspectos relativos a su autovaloración y la imagen que proyecta de sí misma, determinantes estos que pueden influir en el parto y su posterior recuperación, siendo el bienestar psicológico potenciador de salud para la madre y el bebé

Setting intelligent city tiling strategies for urban shading simulations

Assessing accurately the solar potential of all building surfaces in cities, including shading and multiple reflections between buildings, is essential for urban energy modelling. However, since the number of surface interactions and radiation exchanges increase exponentially with the scale of the district, innovative computational strategies are needed, some of which will be introduced in the present work. They should hold the best compromise between result accuracy and computational efficiency, i.e. computational time and memory requirements. In this study, different approaches that may be used for the computation of urban solar irradiance in large areas are presented. Two concrete urban case studies of different densities have been used to compare and evaluate three different methods: the Perez Sky model, the Simplified Radiosity Algorithm and a new scene tiling method implemented in our urban simulation platform SimStadt, used for feasible estimations on a large scale. To quantify the influence of shading, the new concept of Urban Shading Ratio has been introduced and used for this evaluation process. In high density urban areas, this index may reach 60% for facades and 25% for roofs. Tiles of 500 m width and 200 m overlap are a minimum requirement in this case to compute solar irradiance with an acceptable accuracy. In medium density areas, tiles of 300 m width and 100 m overlap meet perfectly the accuracy requirements. In addition, the solar potential for various solar energy thresholds as well as the monthly variation of the Urban Shading Ratio have been quantified for both case studies, distinguishing between roofs and facades of different orientations