Are tornado-like magnetic structures able to support solar prominence plasma?

Recent high-resolution and high-cadence observations have surprisingly suggested that prominence barbs exhibit apparent rotating motions suggestive of a tornado-like structure. Additional evidence has been provided by Doppler measurements. The observations reveal opposite velocities for both hot and cool plasma on the two sides of a prominence barb. This motion is persistent for several hours and has been interpreted in terms of rotational motion of prominence feet. Several authors suggest that such barb motions are rotating helical structures around a vertical axis similar to tornadoes on Earth. One of the difficulties of such a proposal is how to support cool prominence plasma in almost-vertical structures against gravity. In this work we model analytically a tornado-like structure and try to determine possible mechanisms to support the prominence plasma. We have found that the Lorentz force can indeed support the barb plasma provided the magnetic structure is sufficiently twisted and/or significant poloidal flows are present.Comment: Accepted for publication in ApJ

La importancia del conocimiento anatómico en la evaluación antropométrica

Si bien el desarrollo de la antropometría como ciencia comienza en los albores del siglo XX, la preocupación del hombre por las proporciones corporales nos remonta a la cultura helenística. A lo largo de la historia siempre hubo preocupación por las dimensiones del hombre, siendo el hombre de Vitrubio de Leonardo Da Vinci quizás el ejemplo más famoso. En el Siglo XX la antropometría comenzó a constituirse como ciencia a partir de las escuelas Biotipológicas, luego promediando el siglo XX empieza la relación inquebrantable de esta ciencia con el deporte, sobre todo con los trabajos cada vez más numerosos y complejos que se daban con cada cita olímpica. Hoy en día la antropometría es una herramienta muy consolidada en el ámbito deportivo no solo para evaluar la composición corporal de los atletas, sino también para la búsqueda de talentos, la predicción de talla adulta en niños deportistas, etc. Pero es cierto también trasciende este ámbito y se hace presente en disciplinas como la ergonomía), las ciencias medicas, el fitness, etc. El conocimiento anatómico es de fundamental importancia no solo en lo que a la medición antropométrica propiamente dicha se refiere, siendo no solo fundamental para apoyar desde lo teórico la ubicación rápida y certera de las Landmarks (puntos anatómicos que se marcan sobre el evaluado para la posterior medición), sino también, y quizás de más importancia aún, para la interpretación posterior de los resultados antropométricos. En este aspecto la importancia de esta ciencia se establece en la posibilidad de la anatomía de permitir fundamentar o al menos hipotétizar desde un conocimiento científico el por qué por ejemplo un determinado deporte requiere ciertas dimensiones corporales para la consecución de resultados exitosos, o por que otros deportes son más flexibles en lo que a composición corporal respect

On the implementation of an adaptive extremum seeking algorithm for hydrogen minimization in PEM fuel cell based systems

This work presents initial experimental results of an adaptive sliding-mode extremum seeker that minimizes the hydrogen consumption in a fuel cell based system. The extremum seeker is based on the classical steepest-descent method, the main challenge being the fact that the gradient of the objective function is unknown. The gradient is estimated by means of a sliding-mode adaptive estimator. The strategy is applied in experimental practical situations in a fuel cell test bench, this allows to asses the performance of the scheme as well as the difficulties that arise in real applicationsPeer ReviewedPostprint (author’s final draft

On the implementation of an adaptive extremum seeking algorithm for hydrogen minimization in PEM fuel cell based systems

This work presents initial experimental results of an adaptive sliding-mode extremum seeker that minimizes the hydrogen consumption in a fuel cell based system. The extremum seeker is based on the classical steepest-descent method, the main challenge being the fact that the gradient of the objective function is unknown. The gradient is estimated by means of a sliding-mode adaptive estimator. The strategy is applied in experimental practical situations in a fuel cell test bench, this allows to asses the performance of the scheme as well as the difficulties that arise in real applicationsPeer ReviewedPostprint (author’s final draft

Biomass Porous Carbons Derived from Banana Peel Waste as Sustainable Anodes for Lithium-Ion Batteries

Disordered carbons derived from banana peel waste (BPW) were successfully obtained by employing a simple one-step activation/carbonization method. Different instrumental techniques were used to characterize the structural, morphological, and textural properties of the materials, including X-ray diffraction, thermogravimetric analysis, porosimetry and scanning electron microscopy with energy-dispersive X-ray spectroscopy. The chemical activation with different porogens (zinc chloride, potassium hydroxide and phosphoric acid) could be used to develop functional carbonaceous structures with high specific surface areas and significant quantities of pores. The BPW@H3PO4 carbon exhibited a high specific surface area (815 m2 g−1), chemical stability and good conductivity for use as an anode in lithium-ion batteries. After 200 cycles, this carbon delivered a reversible capacity of 272 mAh g−1 at 0.2 C, showing a notable retention capacity and good cycling performance even at high current densities, demonstrating its effectiveness and sustainability as an anode material for high-energy applications in Li-ion batteries

La adiccionología una especialidad médica y subespecialidad de la psiquiatría: Addictionology a medical specialty and sub-specialty of psychiatry

Addictionology as a component of the health sciences is rapidly becoming recognized as a medical discipline, specifically as a subspecialty of psychiatry. The problem of addictions is a subject that extends and worsens in postmodern society, due to its multidimensionality and multifactoriality. The health conditions of the countries have improved in terms of reducing mortality and the incidence of some communicable diseases. However, there is a greater incidence of chronic noncommunicable diseases related to lifestyles, as well as the emergence of health problems derived from violence, drug consumption, social, recreational addictions and digital addiction (connectivity). Family factors, including rejection by parents and family conflicts, due to substance abuse and mental health problems, are among the strongest and most consistent predictors of adolescent behavior problems. Therefore, in the Holistic Family Centered Model, Nizama proposes integral human development through multidimensional organization as an axis of life that comprises eleven dimensions of human life: body, genetic potential, personality, human essence, cognition, imagination, lifestyles, assets, image, futurity and posterity. In conclusion, addictionology is the medical specialty indicated for the successful and hopeful management of this volitional disease in all age groups, with committed and sustainable family adherence. DOI:10.25176/RFMH.v19.n2.2078La adiccionología como componente de las ciencias de la salud, está alcanzando un rápido reconocimiento como disciplina médica, específicamente como subespecialidad de la psiquiatría. El problema de las adicciones es un tema que se extiende y se agrava en la sociedad posmoderna, debido a su multidimensionalidad y multifactorialidad. Las condiciones de salud de los países han mejorado en cuanto a la reducción de la mortalidad y de la incidencia de algunas enfermedades transmisibles. Sin embargo, se está dando una mayor incidencia de enfermedades crónicas no transmisibles relacionadas con los estilos de vida, así como la emergencia de problemas de salud derivados de la violencia, el consumo de drogas, adicciones sociales, lúdicas y adicción digital (conectividad). Los factores familiares, incluyendo el rechazo de los padres y los conflictos familiares, debido al abuso de sustancias y problemas de salud mental, se encuentran entre los predictores más fuertes y consistentes de los problemas de comportamiento de los adolescentes. De otro lado, en el Modelo Holístico Centrado en la Familia, Nizama propone el desarrollo humano integral mediante la organización multidimensional como eje de vida que comprende once dimensiones de la vida humana: corporal, potencial genético, personalidad, esencia humana, cognición, imaginación, estilos de vida, activos, imagen, futuridad y posteridad. En conclusión, la adiccionología es la especialidad médica indicada para el manejo exitoso y esperanzador de esta enfermedad volitiva en todos los grupos de edad, con adherencia familiar comprometida y sostenible. DOI:10.25176/RFMH.v19.n2.207

Planeacion Financiera:Analisis del Presupuesto como Herramienta de la Planeacion Financiera a Corto Plazo en la Empresa NICACEL S,A, Durante el Periodo 2014

Todos los comercios están circundados por un entorno socio-económico cambiante en el cual la incertidumbre de lo que pueda pasar con sus empresas es como una variable inconstante, por esta razón se realiza la planeación financiera en el cual se proyectan y se fijan las bases de las actividades financieras con el objeto de minimizar el riesgo y aprovechar las oportunidades y los recursos. Por lo tanto las técnicas de planeación financiero consisten en recopilar los datos de los estados financieros principales (Balance general y estados de resultados), del año en curso, con la finalidad de ver y evaluar, la gestión y el grado de éxito alcanzado por la empresa permitiendo el planteamiento de un presupuesto con el cual se trazan nuevas metas y planes que se concretan dentro de la empresa

Technology transfer literature review

This paper presents a review of the literature on technology transfer, aiming to identify and to characterize the subject approaches. As for methodology, such a review is integrative nature and literature, thematic, historical and analytical. The searched contents are presented according to a taxonomic structure identified in the literature, which was adapted based on reviewed studies. We conclude that in the literature there is a convergence in the structure of the concepts of technology and technology transfer, whose evolution over time did not generate changes. It appears that there are no studies observed a consolidation of features promoting the effectiveness of technology transfer, or of obstacles to overcome in this process. Papers analyzed do not include all the other components of the process identified in this review, such as actors, strategy and projects for access to technology, which are addressed in scattered and piecemeal fashion. In the study, we could observe that different types of knowledge transfer presented in the literature are related to the actors that promote the transfer, like the receiver, the transmitter and facilitators, and their correlations highlighted here. As part of the analyzed studies, this review aims to highlight those gaps in the literature, directing future research on the topic.Este trabalho apresenta uma revisão da literatura sobre transferência de tecnologia, com o objetivo de identificar e caracterizar abordagens sobre o tema. Quanto à metodologia adotada, tal revisão é de natureza integrativa e de cunho bibliográfico, temático, histórico e analítico. Os conteúdos pesquisados estão apresentados conforme uma estrutura taxonômica identificada na literatura, a qual foi adaptada, com base nos estudos consultados. Conclui-se que há na literatura uma convergência na estrutura dos conceitos de tecnologia e transferência de tecnologia, cuja evolução no tempo não gerou alterações. Verifica-se que não existem nos estudos observados uma consolidação das características promotoras da efetividade da transferência de tecnologia, ou dos obstáculos a transpor neste processo. É observado que os trabalhos analisados não incluem a totalidade dos demais componentes do processo identificados nesta revisão, tais como atores, estratégia e projetos para acesso à tecnologia, os quais são abordados de modo disperso e pontual. No estudo observa-se ainda que as diferentes tipologias de transferência de conhecimento apresentadas na literatura estão relacionadas aos atores que promovem a transferência, ou seja, o receptor, o emissor e os facilitadores, sendo aqui destacadas as suas correlações. No âmbito dos estudos analisados, esta revisão se propõe a indicar as referidas lacunas literárias, direcionando futuras pesquisas sobre o tema.info:eu-repo/semantics/publishedVersio