Electric charge limits on settled powders

In flows of dry particulate systems, electric charge is generated on particle surfaces by their collision with walls and with other particles. Charge build-up on single particles can yield local charge values high enough to surpass the limiting electric field for corona discharge into the surrounding gas. Then, local charge is decreased to a lower value that becomes stabilized when flows stop and particles deposit in a container. In this paper, we have used a Faraday pail system to measure the residual particle charge after using two different devices—tribochargers—for particle charging. One of the tribochargers allowed us to directly measure the total charge that was transferred from the walls to the particles, and this was compared to the final values in the bulk powder once it was collected in the Faraday pail. The results show that the electric charge of particles dispersed in gas is limited by corona discharge and depends mainly on the particle size. In addition, we present a simple model of the discharge of the collected powder based on electrostatic considerations. If the powder effective conductivity and the electric charge of the settling particles are known, the model predicts the temporal evolution of the total charge of the collected powder and the spatial distribution of the electric charge and electric field.Ministerio español de Economía y Competitividad-FIS2014-54539-

Enhancement of CO2 capture in limestone and dolomite granular beds by high intensity sound waves

The calcium looping (CaL) process, based on the calcination/carbonation of CaCO3 at high temperatures, has emerged in the last years as a potentially low cost technology for CO2 capture. In this work, we show that the application of high intensity sound waves to granular beds of limestone and dolomite in a CaL reactor enhances significantly their multicycle CO2 capture capacity. Sound waves are applied either during the calcination stage of each CaL cycle or in the carbonation stage. The effect of sound is to intensify the transfer of heat, mass and momentum and is more marked when sound is applied during calcination by promoting CaO regeneration. The application of sound would allow reducing the calcination temperature thereby mitigating the decay of capture capacity with the number of cycles and reducing the energy penalty of the technology.Ministerio de Economia y Competitividad CTQ2014-52763-C2-2-

Aportaciones a la flora del sureste ibérico

New records to the flora of SE Spain.Palabras clave: Corología, plantas vasculares, Murcia, Albacete, España.Key words: Chorology, vascular plants, Murcia, Albacete, Spain

Evaluation and Accreditation System of External Internship Tutors - SEATPE

[ES] La Universidad de Valencia ha implementado desde 2012 un Sistema de Evaluación y Acreditación de Tutores de Pasantías Externas (SEATPE) a través de su Fundación Universidad-Empresa, ADEIT, bajo la dirección del Vicerrector de Empleo y Programas Formativos. Los objetivos principales de este sistema son mejorar la calidad de la tutoría de pasantías externas implementando mecanismos para reconocer el buen trabajo de los tutores y aumentar el compromiso de las empresas y entidades con la capacitación práctica de nuestros estudiantes. Está dirigido a los dos perfiles de tutores: académicos y empresas. Los tutores que acceden al SEATPE obtienen una "Mención de calidad" en el caso del tutor académico y una "Acreditación" en el caso del tutor de la empresa. Hasta ahora hemos realizado cinco llamadas y 500 tutores de pasantías han obtenido su acreditación o mención de calidad.Valero Aleixandre, MA.; Barberá Gregori, MA.; Pérez Boullosa, A.; Montoro Sánchez, Y.; Ridocci Quiles, M. (2020). Evaluation and Accreditation System of External Internship Tutors - SEATPE. En 6th International Conference on Higher Education Advances (HEAd'20). Editorial Universitat Politècnica de València. (30-05-2020):643-649. https://doi.org/10.4995/HEAd20.2020.11120OCS64364930-05-202

Tecnología de la Información y Comunicación en estudiantes del nivel primario en el marco de la educación inclusiva en un Centro de Educación Básica Especial

This research aims to know the impact of information and communication technologies (ICT), as an innovative mechanism applied in curricular teaching experiences, for the development of cognitive and socio-emotional skills of students aged between 08 to 13 years from primary school who had disabilities to speak or move within the context of a Special Basic Education Center (CEBE). It was a qualitative, substantive research. The Plaphoons (free software created for special education needs) technological tool was used. The analysis of the contents of the intentions, perceptions, observation, and data registration was carried out through the triangulation of data and categorization of contents for issuing results. It was concluded that the use of this ICT enhanced the abilities of these students, confirming cognitive improvements for learning the topics of mathematical logic, communication and social sciences. It was also found that this tool allows a better and greater development of their social skills.Esta investigación tiene como  objetivo  conocer el impacto de las tecnologías de la información y la comunicación (TIC), como mecanismo innovador aplicado en experiencias curriculares docentes, para el desarrollo de habilidades cognitivas y socio emocionales de estudiantes entre 08 a 13 años del nivel primaria que presentaron discapacidad para hablar o moverse dentro del contexto de un Centros de Educación Básica Especial (CEBE). Fue una investigación cualitativa, sustantiva. Se usó la herramienta tecnológica Plaphoons (software libre creado para necesidades educativas especiales). Se realizó el análisis de contenidos de las intenciones, percepciones, observación, registro de datos mediante la triangulación de datos y categorización de contenidos para la emisión de resultados. Se concluyó que el uso de esta TIC potenció las capacidades de esos estudiantes, constatando mejoras cognitivas para el aprendizaje de los tópicos de lógico matemática, comunicación y ciencias sociales. Asimismo, se constató que esta herramienta permite un mejor y mayor desarrollo de sus habilidades sociales

Memristor Emulator Circuit Design and Applications

This chapter introduces a design guide of memristor emulator circuits, from conceptual idea until experimental tests. Three topologies of memristor emulator circuits in their incremental and decremental versions are analysed and designed at low and high frequency. The behavioural model of each topology is derived and programmed at SIMULINK under the MATLAB environment. An offset compensation technique is also described in order to achieve the frequency-dependent pinched hysteresis loop that is on the origin and when the memristor emulator circuit is operating at high frequency. Furthermore, from these topologies, a technique to transform normal non-linear resistors to inverse non-linear resistors is also addressed. HSPICE numerical simulations for each topology are also shown. Finally, three real analogue applications based on memristors are analysed and explained at the behavioural level of abstraction

Sarcomas de partes blandas. Análisis de 42 casos

El objetivo de este estudio es valorar el pronóstico a largo plazo de una serie de pacientes tratados en nuestro hospital en relación con diversos factores clínicos, diagnósticos y terapéuticos que podrían condicionarlo. Se revisaron 123 pacientes tratado por tumores malignos de partes blandas entre los años 1979 y 1999, de estos solo 42 cumplieron las características para incluirles en nuestro estudio. Se valoró su evolución teniendo en cuenta las variables pronosticas identificadas en trabajos previamente publicados y nuestra propia experiencia y se realizó el estudio estadístico de las mismas. En el análisis estadístico del estudio se utilizó el programa SPSS versión 8.0WIN y se realizó el análisis de supervivencia mediante el método de Kaplan-Meier. El tiempo de supervivencia total descrito según este método para el total de los casos estudiados presenta una mediana de 33 meses con un error estándar de 8 y un intervalo de confianza del 95% de (17,49), el tiempo libre de enfermedad presenta una mediana de 9 meses con un error estándar de 2 y un intervalo de confianza del 95% de (6,12) y el tiempo de aparición de metástasis presenta una mediana de 26 meses con un error estándar de 5 y un intervalo de confianza del 95% de (17,35). A su vez se realizó el análisis bivariante de las múltiples variables pronosticas. El gran número de variables y la dispersión de la muestra hacen aconsejable estudios multicéntricos prospectivos más numerosos para obtener conclusiones definitivas sobre este tipo de tumores.The aim of this study is to evaluate the long-term prognosis of a series of patients treated in our hospital with regard to various clinical, diagnostic and therapeutic factors. A total of 123 patients who had been treated for malignant soft tissue tumours between 1979 and 1999 were reviewed. Of these, only 42 fulfilled the requirements to be included in our study. The outcome was evaluated taking into account prognostic variables identified in previously published studies and our own experience, and a statistical study of these factors as carried out with the Kaplan-Meier survival analysis method. The total survival time for all the cases studied was 33+8 (median + SE) months with a 95% confidence interval of 17.49 months. The time free of illness was 9+2 (median + SE) months with a 95% confidence interval of 6.12 months. The time-period until metastasis appeared was 26+5 (median + SE) months with a 95% confidence interval of 17.35 months. At the same time, the bivariant analysis of the many prognostic variables was performed. The high number of variables and the dispersion of the sample group suggest that it would be advisable to carry out more prospective, multicentric studies to reach definitive conclusions about this type of tumour

Effects of Renewable Energy Production and Infrastructure on Wildlife

The high levels of human demands of resources—from food to space and energy—are one of the main drivers of global change and are causing large negative impacts on ecosystems functioning worldwide (Vitousek et al. 1997 ). Global change components range from climate change to habitat destruction, species invasions, pollution and eutrophication. Although these factors can produce ecosystem changes independently, the final descent is often driven by synergistic processes. The resulting amplifying feedbacks can be disconnected from the original driver of change, leading to a state shift in the biosphere with unexpected consequences (Barnosky et al. 2012 ). Climate change seems to have taken prominence over other drivers of global change, leading to larger funding and attention with respect to other major components of global change (Veríssimo et al. 2014 )

Effects of Renewable Energy Production and Infrastructure on Wildlife

The high levels of human demands of resources—from food to space and energy—are one of the main drivers of global change and are causing large negative impacts on ecosystems functioning worldwide (Vitousek et al. 1997 ). Global change components range from climate change to habitat destruction, species invasions, pollution and eutrophication. Although these factors can produce ecosystem changes independently, the final descent is often driven by synergistic processes. The resulting amplifying feedbacks can be disconnected from the original driver of change, leading to a state shift in the biosphere with unexpected consequences (Barnosky et al. 2012 ). Climate change seems to have taken prominence over other drivers of global change, leading to larger funding and attention with respect to other major components of global change (Veríssimo et al. 2014 )