Explosions Triggered by Violent Binary-Star Collisions: Application to Eta Carinae and other Eruptive Transients

This paper discusses a model where a violent periastron collision of stars in an eccentric binary system induces an eruption or explosion seen as a brief transient source, attributed to LBVs, SN impostors, or other transients. The key ingredient is that an evolved primary increases its photospheric radius on relatively short timescales, to a point where the radius is comparable to or larger than the periastron separation in an eccentric binary. In such a configuration, a violent and sudden collision would ensue, possibly leading to substantial mass ejection instead of a binary merger. Repeated periastral grazings in an eccentric system could quickly escalate to a catastrophic encounter, wherein the companion star actually plunges deep inside the photosphere of a bloated primary during periastron, as a result of the primary star increasing its own radius. This is motivated by the case of $\eta$ Carinae, where such a collision must have occured if conventional estimates of the present-day orbit are correct, and where brief peaks in the light curve coincide with periastron. Stellar collisions may explain brief recurring LBV outbursts like SN 2000ch and SN 2009ip, and perhaps outbursts from relatively low-mass progenitor stars (collisons are not necessarily the exclusive domain of very luminous stars). Finally, mass ejections induced repeatedly at periastron cause orbital evolution; this may explain the origin of very eccentric colliding-wind Wolf-Rayet binaries such as WR140.Comment: 5 pages, 1 figure, submitted to MNRAS letters. fixed erro

"Unknown" Students on College Campuses: An Exploratory Analysis

Examines data from three campuses to identify college students falling into the "race/ethnicity unknown" category. Provides recommendations for increasing demographic accuracy, and measuring the success of underrepresented students in higher education

Towards improved measurement of financial protection in health

Christopher Millett and colleagues argue that new metrics are needed to better inform policy development on financial protection in health

Modeling Cascading Failures in the North American Power Grid

The North American power grid is one of the most complex technological networks, and its interconnectivity allows both for long-distance power transmission and for the propagation of disturbances. We model the power grid using its actual topology and plausible assumptions about the load and overload of transmission substations. Our results indicate that the loss of a single substation can lead to a 25% loss of transmission efficiency by triggering an overload cascade in the network. We systematically study the damage inflicted by the loss of single nodes, and find three universal behaviors, suggesting that 40% of the transmission substations lead to cascading failures when disrupted. While the loss of a single node can inflict substantial damage, subsequent removals have only incremental effects, in agreement with the topological resilience to less than 1% node loss.Comment: 6 pages, 6 figure

Tamm states in one dimensional photonic crystals containing left-handed materials

We present a theoretical study of electromagnetic surface waves localized at an interface separating a conventional uniform medium and a semi-infinite 1-D photonic crystal made of alternate left-handed metamaterial and right-handed material which we refer to as left-handed photonic crystal. We find novel type of surface mode's structure, the so-called surface Tamm states and demonstrate that the presence of metamaterial in the photonic crystal structure allows for a flexible control of the dispersion properties of surface states, and can support the Tamm states with a backward energy flow and a vortex-like structure.Comment: 8pages, 5 figure

Positive aging, positive dying: Intersectional and daily communicational issues surrounding palliative and end of life care services in minority groups in the UK and the US

As our global demographic shifts towards an increasingly aging population, we have an opportunity to transform how we experience and think about getting older and embrace the diversity and contribution that this population can bring to society. The International Handbook of Positive Aging showcases the latest research and theory into aging, examining the various challenges faced by older adults and the ways in which we can bring a much needed positive focus towards dealing with these. The handbook brings together disparate research from medical, academic, economic and social community fields, with contributions from NHS partners, service users, universities across the UK and collaborations with international research leaders in the field of aging. Divided into sections, the first part of the book focuses on introducing the concept of positive aging before going on to cover the body over the life course, well-being and care delivery. All contributors recognise the fact that we are living longer is providing us with a tremendous opportunity to enjoy and flourish in healthy and fulfilling later lives, and this focus on the importance of patient empowerment is integral to the book. This is a valuable reference source for those working in developmental psychology, clinical psychology, mental health, health sciences, medicine, neuropsychological rehabilitation, sociology, anthropology, social policy and social work. It will help encourage researchers, professionals and policy makers to make the most of opportunities and innovations to promote a person’s sense of independence, dignity, well-being, good health and society participation as they get older

Strengthening the reading and writing process through the Glenn Doman method with the participation of parents, in first grade students of the Gonzalo Rivera Laguado School

La presente investigación tuvo como objetivo general fortalecer el proceso lectoescritor mediante el método Glenn Doman con paticipación de los padres, en estudiantes de grado primero del colegio Gonzalo Rivera Laguado, Cúcuta, Colombia. Este estudio corresponde a una investigación-acción participante, conformada en capítulos que demuestran la problemática y sus respectivas soluciones. El diseño de la investigación se desarrolló través de las siguientes etapas: Construcción de la ruta de trabajo y diseño de instrumentos, entrevista informantes claves e interpretación de la información, la cual se llevó a cabo mediante la categorización inicial y emergente, la población general del Colegio Consta de 1173 estudiantes, para el estudio en cuestión la población estuvo representada por 29 estudiantes cursantes del grado primero, y proporcionalmente la cantidad de padres y representantes, la muestra fue de seis padres de familia igualmente para el caso de los estudiantes. Se fortaleció el proceso lecto escritor de los estudiantes incrementando su capacidad comprensiva para dar lectura y escritura a palabras y oraciones mediante el método Glen Doman, paralelamente se incrementaron las acciones participativas de los padres de familia, demostrando que las estrategias didácticas implementadas en la propuesta influyen significativamente en la apropiación del método y la contribución de técnicas de enseñanza aplicadas en el hogar. Finalmente, se socializaron los resultados del proyecto con la comunidad educativa y se dejó el proyecto inmerso en un plan de mejoramiento institucional que será implementado en todas las áreas, cursos y sedes de la Institución Educativa.1.Contextualización de la investigación……………………………………………………..15 1.1 Descripción de la situación problémica 15 1.2 Formulación del problema 19 1.3 Objetivos 19 1.3.1 Objetivo General 19 1.4. Justificación 20 1.5 Contextualización de la institución 22 Capítulo II . 2. Marco referencial 24 2.1 Antecedentes de la Investigación 24 2.1.1 Antecedentes documentales internacionales. 24 2.1.2 Antecedentes Documentales Nacionales. 27 2.1.3 Antecedentes documentales regionales. 30 2.1.4 Antecedentes bibliográficos. . 2.2 Marco Teórico 33 2.2.1 Importancia de la participación de los padres en el proceso de aprendizaje 33 2.2.2 Rol De Los Padres En El Proceso De Aprendizaje 35 2.2.3 Incorporación de los padres a la institución y para facilitar su participación en el proceso de aprendizaje 38 2.2.4 Bondades de la integración hogar-escuela-entorno comunitario 41 2.2.5 Aprendizajes del niño en la familia 41 2.2.6 Estrategias de integración para la participación de los padres y representantes en el proceso de aprendizaje de los estudiantes. 42 2.2.7 Relación entre la familia y la escuela 45 2.2.8 Padres y Maestros en un Ambiente de Apoyo. 46 2.2.9 Desinterés familiar su influencia en el aprendizaje del lenguaje del estudiante. 49 2.2.10 Enfoques teóricos del aprendizaje 51 2.2.11 Perspectivas pedagógicas en el aprendizaje del lenguaje. 54 2.2.12 Métodos para que los niños y niñas aprendan a leer 56 2.2.13 Método de Glenn Doman como alternativa aprendan a leer 58 2.3 Marco Legal 63 Capitulo III . 3. Marco Metodológico 65 3.1 Naturaleza de la Investigación 65 3.2Tipo de Investigación . 3.3 Fases del Estudio 66 3.4 Diagnóstico Participativo 67 3.5 Codificación de Informantes . 3.6 Técnica e Instrumento de Recolección de Datos 68 3.7 Credibilidad y Consistencia de los resultados obtenidos 70 3.8 Categorización 70 3.9 Análisis de la Información 71 CAPÍTULO IV 73 4 RESULTADOS PRESENTACIÓN DE LOS RESULTADOS 73 4.2 Triangulación de la Información 89 CAPITULO V 73 5 PROPUESTA DE ACCIÓN 94 5.1 Presentación de la propuesta 94 5.2 Justificación 95 5.3 Propósitos de la propuesta 96 5.3.1 Objetivos específicos 96 5.4 Metodología del proceso didáctico de desarrollo 101 5.5 Fundamento pedagógico 96 5.6 Estudio de Factibilidad. 98 5.7 Criterios para la selección de los Contenidos 101 5.8 Evaluación de los Talleres 101 5.9 Diseño de actividades 101 5.10 Análisis de las experiencias y las estrategias relevantes que resultaron de la de acción institucional. 117 5.11 Estrategias motivacionales sustentadas en la integración y participación de los padres y representantes con los estudiantes que faciliten el desarrollo de pensamiento cognoscitivo en los estudiantes para fortalecer el proceso de aprendizaje significativo con el método Glenn Doman. Método in extenso 120 5.12 Estrategias Didácticas hacia los padres y representantes. 123 CONCLUSIONES Y RECOMENDACIONES 127 Conclusiones 127 Recomendaciones 130 Referencias bibliográficas 131MaestríaThe present research entitled Strengthening the reading and writing process in students of the first grade of basic education of the school Gonzalo Rivera Laguado through the application of the method Doman with the integration of parents has as main objective to design a didactic proposal to strengthen the reading and writing process through the application of the Doman method and the integration of parents of students of the first grade of basic education of the Gonzalo Rivera Laguado School, Cúcuta, Colombia. This study corresponds to a participatory research-action, of qualitative type, formed in chapters that demonstrate the problem and their respective solutions. The research design was developed through the following stages: Construction of the work route and design of instruments, key informant interview and interpretation of the information, which was carried out through the initial and emergent categorization, coming from the application of an instrument type in-depth interview with key informants, in this case, six parents and representatives of the first degree of the selected educational institution. According to the testimonies of the same, they demonstrated the presence of problems in the integration of parents and representatives to the reading process in the students in activities developed in the home, a series of actions were planned and developed with the participation of the involved actors , in order to carry out demonstrations for the execution of teaching techniques, through awareness sessions on the importance of the Glenn Doman method for language development, where motivational strategies based on integration are highlighted as a technique for the improvement of the levels of participation. Finally, the results of the project were socialized with the educational community and the project was left immersed in an institutional improvement plan that will be implemented in all the areas, courses and headquarters of the Educational Institution

Self-Organized Criticality in a Fibre-Bundle type model

The dynamics of a fibre-bundle type model with equal load sharing rule is numerically studied. The system, formed by N elements, is driven by a slow increase of the load upon it which is removed in a novel way through internal transfers to the elements broken during avalanches. When an avalanche ends, failed elements are regenerated with strengths taken from a probability distribution. For a large enough N and certain restrictions on the distribution of individual strengths, the system reaches a self-organized critical state where the spectrum of avalanche sizes is a power law with an exponent $\tau\simeq 1.5$.Comment: 10 pages, 6 figures. To be published in Physica