Sobre el uso de la historia de vida para narrar las trayectorias universitarias del alumnado con diversidad funcional

La investigación narrativa se ha consolidado como un tipo de metodología que viene a enfatizar la importancia de que las personas hablen de ellas mismas, sin silenciar su subjetividad. Así constituye un modo más democrático y natural de investigación porque otorga representación a las voces de los protagonistas, quienes podríamos decir que se constituyen en co-investigadores de su propia vida. El trabajo que presentamos se encuentra enmarcado dentro de un proyecto de investigación1 actualmente en desarrollo que se basa en el método biográfico-narrativo y que tiene como principal objetivo identificar y estudiar las barreras y ayudas con las que se encuentran los estudiantes con diversidad funcional en el entorno universitario. En concreto, esta investigación hace uso de historia de vida (life history) que es el relato de una vida, pero incluye también información biográfica obtenida de otras muchas fuentes -como documentos complementarios u otros informantes, además del propio relato autobiográfico-. El proyecto abarca a la Universidad de Sevilla en toda su amplitud, y en él participa un equipo investigador interdisciplinar, cuyos miembros provienen de diferentes áreas de conocimiento. Esto facilita que se pueda estudiar en una mayor profundidad la situación de estudiantes en cualquier titulación de la Universidad, y además, incidiendo en todas las etapas del proceso formativo, desde la entrada hasta su egresión. En el trabajo que aquí se presenta nos acercarnos al tema de estudio parcialmente, a través de la presentación propia del proyecto. En concreto se plantea el diseño de investigación seguido en el momento de realizar las historias de vida, describiendo los instrumentos de recogida de datos que hemos utilizado para la construcción de dichas historias

Experimental study of MIMO-OFDM transmissions at 94 GHz in indoor environments

Millimeter wave (mm-wave) frequencies have been proposed to achieve high capacity in 5G communications. Although meaningful research on the channel characteristics has been performed in the 28, 38and 60 GHz bands ─in both indoor and short-range scenarios─,only a small number of trials (experiments) have been carried out in other mm-wave bands. The objective of this work is to study the viability and evaluate the performance of the 94 GHz frequency band for MIMO-OFDM transmission in an indoor environment. Starting from a measurement campaign, the performance of MIMO algorithms is studied in terms of throughput for four different antenna configurations.This work was supported in part by the Ministerio de Economía y Competitividad MINECO, Spain under Grant TEC2016-78028-C3-2-P, and in part by the European FEDER funds

Análisis de las barreras y ayudas que los estudiantes con discapacidad se encuentran en las aulas universitarias

Este trabajo forma parte de un proyecto más amplio que está desarrollando en la Universidad de Sevilla1 (US) un grupo de investigadores de las diferentes áreas de conocimiento (Ciencias de la Salud, Ciencias Experimentales y Ciencias Sociales y Jurídicas) sobre las barreras y ayudas que identifican los estudiantes con discapacidad tanto desde el punto de vista de la Universidad como institución como en las aulas universitarias. En concreto, la investigación pretende responder a tres objetivos: 1. Identificar, describir y explicar las barreras y las ayudas que los estudiantes con discapacidad perciben en su acceso, trayectoria y resultados en la Universidad como Institución; 2. Identificar, describir y explicar las barreras y ayudas que los estudiantes con discapacidad experimentan en las aulas universitarias; y 3. Diseñar una guía de formación online para el profesorado universitario con el fin de dar respuesta a las necesidades educativas del alumnado con discapacidad. En este sentido, hemos tratado de dar voz a este grupo de estudiantes, basándonos en la metodología biográfico-narrativa. En concreto, en esta comunicación presentamos los resultados relacionados con las aulas universitarias y organizándolo en torno a tres tópicos: profesorado, proyectos docentes y compañeros de aula.The present paper provides partial findings from research currently underway at the University of Seville (U.S.) by a group of researchers from different areas of knowledge (Health Sciences, Experimental Sciences and Social Sciences and Law) on barriers and aids identify students with disabilities from the point of view of the University as an institution and university classrooms. Specifically, the following objectives provide scaffolding for our research: 1. Identify, describe and explain hurdles and help in areas such as access, academic progress and results as perceived by disabled university students; 2. Identify, describe and explain barriers and aids affecting students with disabilities in the university classroom setting; and 3. Designing an online training guide for faculty in order to meet the educational needs of students with disabilities. In this sense, we tried to give voice to this group of students, based on the biographical-narrative approach. Specifically, in this paper we present the results related to the university classroom and organizing around three topics: lecturers, curricula/syllabi and classmates.MICINN, I+D+I EDU 2010-1626

Traffic noise mitigation using single and double barrier caps of different shapes for an extended frequency range

The primary function of noise barriers is to shield inhabitants of affected areas from excessive noise generated by road traffic. To enhance the performance of noise barriers while simultaneously adhering to height restrictions, the attachment of structures (caps) of different shapes to the tops of conventional screens can be considered. These caps can significantly impact the diffracted sound energy, thereby increasing the desired global acoustic losses. This work presents a comprehensive study of the acoustic performance of noise barriers with single and double attached caps of different shapes through a calculation of their insertion losses (IL). This study comprehensively addresses and compares different types, sizes, combinations, and numbers of noise barrier caps for different scenarios (including sloping and absorbent grounds) and sources (“car” and “ambulance”) for an extended frequency band up to 10 kHz. To the best of the authors’ knowledge, this is a range that has not previously been analyzed. A variety of different cap shapes were considered including cylinders, rectangles, trapezoids, and Y/T-shaped forms. To calculate the IL, an innovative and fast uniform theory of diffraction (UTD)-based method developed by the authors was applied in all simulations. The results showed that the Y-shaped single and double barrier caps were, in general, the most effective at increasing IL without raising the height of the barrier, thereby successfully managing the aesthetic impact. The results also showed how the consideration of sloping and absorbent floors could also contribute to improved noise abatement.This work was funded by the Ministerio de Ciencia e Innovación, Spain (TEC2016-78028-C3-2-P and PID2019-107885GB-C33), and by the European Fonds Européen de Développement Économique et Régional (FEDER) funds

Lean Thinking to Foster the Transition from Traditional Logistics to the Physical Internet

This paper studies the relationship between Lean paradigms and the Physical Internet (PI). Lean thinking is a philosophy that allows one to obtain the right amount of the right items in the right place at the right time; it seeks to minimize waste and is flexible to change. In fact, applying Lean not only helps to reduce costs, but it also adds value and improves results across the supply chain. By using a value stream map, we can map the process from the supply chain to the customer, while trying not to add value activities. Such activities include excessive production, overstorage, waiting times poorly adjusted to needs, defects and rejects that require reprocessing, and, finally, unnecessary transport and movements. Storage, waiting times, and unnecessary transport and movements are at the core of the PI. A value stream map can also help to identify empty transport and unnecessary CO(2)emissions. This study analyzes value stream mapping as a tool that can enable the objectives of the different Alliance for Logistics Innovation through Collaboration (ALICE) roadmaps for logistics innovation to be achieved, and can also allow PI principles to be reached on the established dates

Una función de atenuación expresada en términos de coeficientes UTD para la difracción múltiple de ondas esféricas en comunicaciones microcelulares

This work presents an explicit formulation for multiple edge diffraction for mobile radiowave propagation in terms of UTD-diffraction coefficients when a spherical incident wave is considered. The solution sharply reduces the computing time over existing formulation, specially when the number of edges is very large. The applicability of the result is interesting for both area coverage and interference predictions in microcellular systems.Los autores agradecen a la Dirección General de Ciencia, Tecnología y Sociedad de la Información (Consejería de Ciencia, Tecnología, Industria y Comercio de la Comunidad Autónoma de la Región de Murcia) la financiación de este trabajo (2I02SIU0019)

Costras biológicas del suelo en pastizales gipsófilos del noreste de México

Se evaluó la diversidad y composición de costras biológicas del suelo en un pastizal con suelos gipsófilos y carbonatos de calcio, en el noreste de México. Se identificaron ocho especies: Endocarpon pussillum, Nostoc commune, Oxymitra sp., Psora cerebriforme, Psora crenata, Psora decipiens, Placidium sp. y Xanthoparmelia chlorochroa, con cobertura total de 18.1%. Las especies dominantes fueron Endocarpon pussillum (57.65%) y Placidium sp. (19.91%). La cobertura vegetal fue de 18.3 % y 63.6% de suelo desnudo. La zona mostró valores moderados de diversidad (Shannon & Weiner (H´) =1.68) y de riqueza de costras biológicas del suelo (Índice de Margalef (DMg) =1.2)

Medidas del canal MIMO en la transición de entrada a un pequeño tunel

This contribution investigates the MIMO channel by means of measurements at the entrance of a small tunnel at 2.4 GHz. The wireless channel is measured within 100MHz for a 4x4 MIMO system. It focuses on variations of the transmitter offset and on different antenna spacings, in order to understand the impact of different configurations on capacity. It will be shown that capacity is sensitive to the transmitter offset. Indeed, these measurements showed than it is possible to maintain a low distance between antenna elements if the transmitting offset is increased.Los autores agradecen al Ministerio de Educación y Ciencia (TEC2004-04866-C04-04/TCM) y a la Fundación Séneca (PPC/01444/03) por financiar este trabajo

Una solución híbrida UTD-PO para el análisis de la difracción múltiple de una serie de cilindros asumiendo incidencia de onda esférica

A new hybrid uniform theory of diffraction-physical optics (UTD-PO) formulation for the analysis of the multiple diffraction caused by an array of cylinders, assuming sphericalwave incidence, is hereby presented. The solution, validated with numerical data from technical literature, is mathematically less complex and computationally more efficient −for a large number of cylinders− than other existing methods, due to the fact that high-order diffraction terms (slope diffraction) are not considered, without such lack of terms barely entailing any loss in accuracy. Results can be applied in radiowave propagation analysis when multiple diffraction over rounded obstacles has to be considered.Los autores agradecen al Ministerio de Educación y Ciencia (TEC2007-66698-C04-04/TCM) y a la Fundación Séneca de Murcia (03133/PI/05) la financiación de este trabajo

Differential Estrogenic Effects of the Persistent Organochlorine Pesticides Dieldrin, Endosulfan, and Lindane in Primary Neuronal Cultures

The organochlorine chemicals endosulfan, dieldrin, and ghexachlorocyclohexane (lindane) are persistent pesticides to which people are exposed mainly via diet. Their antagonism of the g-aminobutyric acid-A (GABAA) receptor makes them convulsants. They are also endocrine disruptors because of their interaction with the estrogen receptor (ER). Here, we study the effects of dieldrin, endosulfan, and lindane on ERs in primary cultures of cortical neurons (CN) and cerebellar granule cells (CGC). All the compounds tested inhibited the binding of [3H]-estradiol to the ER in both CN and CGC, with dieldrin in CGC showing the highest affinity.We also determined the effects of the pesticides on protein kinase B (Akt) and extracellular-regulated kinase 1 and 2 (ERK1/2) phosphorylation. Dieldrin and endosulfan increased Akt phosphorylation in CN, which was inhibited by the ERb antagonist 4-[2-phenyl-5,7- bis(trifluoromethyl)pyrazolo[1,5-a]pyrimidin-3-yl]phenol. Instead, Akt and ERK1/2 phosphorylation induced by dieldrin in CGC was mediated by multiple activation of ERa, ERb, and G protein– coupled receptor 30. Lindane did not activate these pathways, but it inhibited estradiol-mediated Akt and ERK1/2 activation. In CN, all the chemicals activated ERK1/2 through a mechanism involving GABAA and glutamate receptors. Long-term exposure to these pesticides reduced the levels of ERa, but not of ERb. Moreover, extracts of CN treated with endosulfan, dieldrin, or lindane induced cell proliferation in MCF-7 human breast cancer–derived cells, whereas only extracts of CGC treated with dieldrin induced MCF-7 cell proliferation. Overall, the observed alterations on ER-mediated signaling and ER levels in neurons might contribute to the neurotoxicity of these organochlorine pesticides.Ministry of Health(FIS 061212, FIS 10/0453); CIBERESP (AA08-001); Generalitat de Catalunya (2009/SGR/214); Consejerı ´a de Innovacio´n, Ciencia y Empresa de la Junta de Andalucı´a (P09-CTS-5488).Peer reviewe