Chaotic dynamics around astrophysical objects with nonisotropic stresses

The existence of chaotic behavior for the geodesics of the test particles orbiting compact objects is a subject of much current research. Some years ago, Gu\'eron and Letelier [Phys. Rev. E \textbf{66}, 046611 (2002)] reported the existence of chaotic behavior for the geodesics of the test particles orbiting compact objects like black holes induced by specific values of the quadrupolar deformation of the source using as models the Erez--Rosen solution and the Kerr black hole deformed by an internal multipole term. In this work, we are interesting in the study of the dynamic behavior of geodesics around astrophysical objects with intrinsic quadrupolar deformation or nonisotropic stresses, which induces nonvanishing quadrupolar deformation for the nonrotating limit. For our purpose, we use the Tomimatsu-Sato spacetime [Phys. Rev. Lett. \textbf{29} 1344 (1972)] and its arbitrary deformed generalization obtained as the particular vacuum case of the five parametric solution of Manko et al [Phys. Rev. D 62, 044048 (2000)], characterizing the geodesic dynamics throughout the Poincar\'e sections method. In contrast to the results by Gu\'eron and Letelier we find chaotic motion for oblate deformations instead of prolate deformations. It opens the possibility that the particles forming the accretion disk around a large variety of different astrophysical bodies (nonprolate, e.g., neutron stars) could exhibit chaotic dynamics. We also conjecture that the existence of an arbitrary deformation parameter is necessary for the existence of chaotic dynamics.Comment: 7 pages, 5 figure

Unveiling functional linkages between habitats and organisms: Macroalgal habitats as influential factors of fish functional traits

Understanding the relationship between the characteristics of habitats and their associated community is essential to comprehend the functioning of ecological systems and prevent their degradation. This is particularly relevant for in decline, habitat-forming species, such as macroalgae, which support diverse communities of fish in temperate rocky reefs. To understand the link between the functional habitats of macroalgae and the functional dimension of their associated fish communities, we used a standardized underwater visual census to quantify the macroalgal functional diversity, as well as the functional diversity, redundancy, and richness of fish communities in 400 sites scattered in three southern temperate marine realms. Our findings reveal that functional macroalgal habitats can be classified into three groups that shape the functional diversity, redundancy, and richness of fish when considering trait commonness. These results enhance our comprehension of the functional connections between the habitat and coexisting fish within marine ecosystems, providing valuable insights for the preservation of these habitats

Realistic Exact Solution for the Exterior Field of a Rotating Neutron Star

A new six-parametric, axisymmetric and asymptotically flat exact solution of Einstein-Maxwell field equations having reflection symmetry is presented. It has arbitrary physical parameters of mass, angular momentum, mass--quadrupole moment, current octupole moment, electric charge and magnetic dipole, so it can represent the exterior field of a rotating, deformed, magnetized and charged object; some properties of the closed-form analytic solution such as its multipolar structure, electromagnetic fields and singularities are also presented. In the vacuum case, this analytic solution is matched to some numerical interior solutions representing neutron stars, calculated by Berti & Stergioulas (Mon. Not. Roy. Astron. Soc. 350, 1416 (2004)), imposing that the multipole moments be the same. As an independent test of accuracy of the solution to describe exterior fields of neutron stars, we present an extensive comparison of the radii of innermost stable circular orbits (ISCOs) obtained from Berti & Stergioulas numerical solutions, Kerr solution (Phys. Rev. Lett. 11, 237 (1963)), Hartle & Thorne solution (Ap. J. 153, 807, (1968)), an analytic series expansion derived by Shibata & Sasaki (Phys. Rev. D. 58 104011 (1998)) and, our exact solution. We found that radii of ISCOs from our solution fits better than others with realistic numerical interior solutions.Comment: 13 pages, 13 figures, LaTeX documen

SMS-Builder: An adaptive software tool for building systematic mapping studies

A Systematic Mapping Study is an instrument frequently used to carry out a search process, identification, and classification of studies in different fields. Researchers in front of this type of process have a challenge while managing the data about these studies. This paper presents a software tool that has been created to help those who need to build a systematic mapping study. In addition, this work follows the evidence-based software engineering approach and extends it through a software tool by including different ways of adapting this process

Study-based Systematic Mapping Analysis of Cloud Technologies for Leveraging IT Resource and Service Management: The Case Study of the Science Gateway Approach

Currently, there is a proliferation of technological tools with a Science Gateway approach. For IT administrators manage these kinds of tools is not a trivial activity, although there is a significant volume of related studies. This situation represents a latent challenge to IT administrators in TERS (Technology Ecosystem for Research Support). This paper analyzes and classifies studies related to IT resources and services management applicable to this type of technology ecosystem. Methodologically we used an adaptation of guidelines aimed at the construction of a SMS (Systematic Mapping Study). Additionally, we performed an analysis of the papers to recognize inferences and trends in them, which allowed us to claim that cloud computing technology plays a predominant role. We consider it good practice for implementations that support research processes. In this sense, we recommend to those interested in this topic to prioritize cloud technologies to achieve an adequate management of the set of IT resources and services used to support Science Gateway environments

La Extensión Universitaria y la Promoción de Salud en la Atención Primaria / The University Extension and Health Promotion in Primary Health Care

RESUMEN La Extensión Universitaria dada su importancia y complejidad debe enmarcarse en una perspectiva estratégica y en su correspondiente expresión dentro de la planeación, tanto a nivel del sistema de la Educación Médica Superior, como al de las propias instituciones y sus estructuras. En el momento actual donde la Universalización de la Educación Médica Superior en Cuba es una realidad, se impone la necesidad de una estrategia que fortalezca desde la atención primaria a través de la promoción de salud la labor extensionista de la universidad médica con la comunidad y para la comunidad. Sin embargo, aún la materialización práctica del concepto amplio sobre dicho trabajo muestra algunas barreras. El trabajo promocional y sociocultural universitario denota una marcada relación dialéctica entre sus dos dimensiones: la administrativa y la tecnológica, las que desde su comprensión e implementación posibilitan perfeccionar la labor extensionista de la Universidad. El nuevo paradigma descansa sobre un concepto amplio de la Extensión Universitaria, diversificado con su consecuente aplicación en la práctica, asumiéndolo como un proceso formativo, dinámico e integrador, multifacético respaldado por un sistema de formación y capacitación, estimulación, comunicación y aseguramiento que hagan más efectiva dicha labor. La promoción de salud es el eje central de la labor extensionista en la Universidad Médica Cubana, coadyuvando a elevar el nivel de conciencia y la capacidad de acción, tanto individual como colectiva a través de sus proyectos en vertientes fundamentales como la comunidad universitaria y extrauniversitaria, con la identificación de las principales necesidades de salud (ASS). Palabras clave: universidades, educación médica, atención primaria de salud, estrategias nacionales.ABSTRACTThe university extension, due to its importance and complexity, must be in line with a strategic perspective and with its corresponding expression within the planning of Higher Medical Education and at the level of the institutions and their structures at the same time. Currently, the universalization of Higher Medical Education in Cuba is a reality, that is why it is necessary to create a strategy which reinforces primary health care by means of health promotion, the features of the medical university extension for and with the community. However; in practice such concept shows some barriers to bring it to fruition. Promotional and university sociocultural works indicate a marked dialectic relationship between the two dimensions: administrative and technological, which from the point of view of its comprehension and implementation make possible to perfect the university extension. The new paradigm is supported by an all-embracing concept of University Extension, that is consistently diversified into its application in practice and undertake as a formative, dynamic, comprehensive and multi-faceted process, which at the same time is endorsed by a system of formation, training, encouragement, communication and assurance to make this work more effective. Health promotion is the core of the university extension in Cuban Medical University, it contributes to increase the level of awareness and the capacity of action from the individual and collective point of view by means of its projects; having basic aspects such as: the university and the extra-university community, where the main health needs are identified.Key words: universities, medical education, primary health care; national strategies

Efecto de la Temperatura de Calcinación en las Propiedades Texturales y Estructurales de Fe(III)-TiO2

El dopaje del dióxido de titanio (TiO2) con iones de metales de transición, como el Fe3+, es uno de los mé­todos empleados para modificar las propiedades físicas y químicas de este material. En este trabajo se analizó la influencia de la temperatura de calcinación en las propiedades texturales y estructurales del dióxido de tita­nio dopado con Fe3+, Fe(III)-TiO2, sintetizado a partir del mineral ilmenita mediante un proceso de extracción con ácido sulfúrico. El material sintetizado fue caracterizado por fluorescencia de rayos X, difracción de rayos X, espectroscopía infrarroja e isotermas de adsorción-desorción de nitrógeno a 77 K. El Fe(III)-TiO2 sintetizado mostró la fase anatasa como único componente cristalino, con buena estabilidad térmica a 700 °C, revelando la sustitución isomórfica de hierro en la estructura del TiO2. Las distribuciones de tamaños de poros del Fe(III)- TiO2 tratado a 400, 500, 600 y 700 °C mostraron un comportamiento monomodal con máxima población en la región de los mesoporos. El aumento de la temperatura de calcinación del Fe(III)-TiO2 condujo a la formación de estructuras sólidas con mayores radios de poros

Aceite ozonizado: alternativa efectiva para las úlceras varicosas de miembros inferiores en Atención Primaria. / Ozonized oil: an effective alternative treatment for lower limb varicous ulcers at Primary Health Care System

La úlcera varicosa es una complicación frecuente en la insuficiencia venosa de los miembros inferiores que condiciona múltiples trastornos locales y sistémicos, con una mala calidad de vida del paciente. El objetivo del presente trabajo fue evaluar el efecto cicatrizante del oleozón en ulceras varicosas de los miembros inferiores en la atención primaria. Se tomó una muestra de 60 pacientes con úlceras varicosas en miembros inferiores que fueron divididos en dos grupos: A) 30 tratados con oleozón®, B) 30 tratados convencionalmente, de forma ambulatoria desde enero de 2007 hasta mayo de 2008. Se consideró como buen resultado cuando a los 45 días de tratamiento o antes, el paciente presentó una remisión parcial o total y se consideró fracasado cuando no hubo remisión. Se utilizó la prueba de comparación de frecuencias de X2 al 95 % de confianza y obtuvo un incremento significativo del doble de casos con remisión total bajo tratamiento con oleozón®, de manera que la eficacia quedó comprobada para el tratamiento ambulatorio en la Atención Primaria de Salud, de las úlceras varicosas de miembros inferiores, rebeldes a tratamiento convencional. Palabras clave: Ulcera varicosa, ozonoterapia, miembros inferiores, oleozón®, uso tópico, atención ambulatoria. ABSTRACT Varicous ulcers are frequent complications of the venous insufficiency of the lower limbs, leading to multiple local and systemic impairments, producing patients having bad quality of life. The aim of the present paper was to evaluate the scarring effect of oleozón®, on various ulcers of the lower limbs at the Primary Health Care level. A sample of60 patients were divided into two groups: A) 30 patients, receiving ozonized oil (oleozón®), B) 30 patients conventionally treated, in ambulatory way since January 2007 to May 2008. A good result was considered when after 45 days of treatment or before that time a partial or total remission was obtained, and failure when no remission was observed. X2 test was used to compare frequencies at 95 % of certainty. There was two fold number of cases under on remission in group A, showing the efficacy of the treatment, otherwise rebels to the conventional treatment. Key words: Lower limbs, varicous ulcers, ozonized oil, local treatment

ICT education policies in Spain after School Program 2.0: Emerging Trends

En este artículo se analiza la situación actual de las políticas educativas destinadas a laincorporación de las TIC a las escuelas en una muestra de ocho comunidades autónomasde España (Andalucía, Canarias, Cataluña, Extremadura, Madrid, País Valenciano, PaísVasco y Principado de Asturias) después del proceso impulsado por el Programa Escuela2.0. Este programa estuvo vigente durante el periodo 2009­2012 y respondió al modelo 1:1,de un ordenador por estudiante. Este análisis se guió por las siguientes cuestiones: ¿Quéefectos permanecen de las experiencias de políticas educativas del modelo 1:1?; ¿Quénuevos proyectos o programas están vigentes en los sistemas educativos de lascomunidades autónomas? ¿Qué nuevas tendencias con relación a las TIC estánemergiendo en la agenda educativa de las políticas autonómicas? Se concluye que lasnuevas políticas TIC, entre otras acciones, apuntan a centrar su atención en laincorporación de las PDI a todas las aulas, a la dotación de tabletas a los estudiantes envez de miniportátiles, a políticas de sustitución de los libros de texto de papel porplataformas de contenidos digitales y a la creación de portales de recursos en la nube. Seconstata también la ausencia de un programa o política educativa TIC coordinada a nivelde todo el estado como fue la experiencia del Programa Escuela 2.0.In this article the current situation of educational policies for the incorporation of ICT inschools in a sample of eight regions of Spain (Andalusia, Canary Islands, Catalonia,Extremadura, Madrid, Valencia, the Basque Country and the Principality of analyzesAsturias) after the process driven by the Escuela 2.0 program. This program was in effectduring the period 2009­2012 and responded to the 1:1 model of a computer per student.This analysis was guided by the following questions: What effects remain from theexperiences of educational policies of the 1:1 model?; What new projects or programs arein place in the educational systems of the regions? What new trends in relation to ICT areemerging in the educational agenda of regional policies? We conclude that the new ICTpolicy, among other things, aim to focus on the integration of IDPs to all classrooms toequipping students tablets instead of netbooks, a substitution policies textbooks paper fordigital content platforms, to create portals of cloud resources. The absence of aneducational program or policy level ICT coordinated statewide as was the experience ofSchool Program 2.0 has been observed