Tunable ring resonator filter for OFDM Transmission systems

A novel tunable filter is theoretically demonstrated. It is based on a ring resonator with an amplifier and a noise filter in the loop. This optoelectronic device has potential as a high-sensitivity receiver and as a tunable demultiplexer in OFDM transmission systems.Publicad

La evaluación del desempeño docente en la educación superior

The purpose of this article is to present a critical review of the ways in which the performance of university teachers are usually evaluated. Generally, the institutions state proposal of evaluation that usually coincide with what is evaluated and the use of the results. It includes the review of the different evaluation models to show the discrepancies between the objectives and the practices, that is, the poor relationship between the model used and what is done. Universities usually declare that the focus of the evaluation is improvement of practice. One of the most used instruments is the questionnaire, with which an accurate measurement can be made, but generally it does not evaluate the teaching performance, but, in the best-case scenario, the opinion of the students. If universities state that the evaluation should serve to improve the teaching practice, it would be advisable to favor the constructivist model that promotes changes required through the reflection that arises from the review of the self-evaluation, the hetero-evaluation and the co-evaluation.El objetivo de este trabajo es presentar una revisión crítica de las maneras en que se tiende a evaluar el desempeño de los docentes universitarios. Por lo general, las instituciones enuncian propósitos de la evaluación que suelen no coincidir con lo que se evalúa y con el uso que se hace de los resultados. Se incluye la revisión de distintos modelos de evaluación Para mostrar los desfases entre objetivos y prácticas, es decir, la pobre relación de lo que se hace, con el modelo del declarado. Se tiende a enunciar que el objetivo de la evaluación está centrado en la mejora continua. Uno de los instrumentos más utilizados es el cuestionario, con el que se pretende hacer una evaluación precisa, pero que, por lo general, no evalúa el desempeño docente, sino, en el mejor de los casos, la opinión de los estudiantes. Si se declara que la evaluación debe servir para mejorar la práctica docente, convendría privilegiar el modelo constructivista que permitiría favorecer los cambios que se requieren a través de la reflexión que surja de la revisión de la autoevaluación, la hetero-evaluación y la co-evaluación

La evaluación del desempeño docente en la educación superior

The purpose of this article is to present a critical review of the ways in which the performance of university teachers are usually evaluated. Generally, the institutions state proposal of evaluation that usually coincide with what is evaluated and the use of the results. It includes the review of the different evaluation models to show the discrepancies between the objectives and the practices, that is, the poor relationship between the model used and what is done. Universities usually declare that the focus of the evaluation is improvement of practice. One of the most used instruments is the questionnaire, with which an accurate measurement can be made, but generally it does not evaluate the teaching performance, but, in the best-case scenario, the opinion of the students. If universities state that the evaluation should serve to improve the teaching practice, it would be advisable to favor the constructivist model that promotes changes required through the reflection that arises from the review of the self-evaluation, the hetero-evaluation and the co-evaluation.El objetivo de este trabajo es presentar una revisión crítica de las maneras en que se tiende a evaluar el desempeño de los docentes universitarios. Por lo general, las instituciones enuncian propósitos de la evaluación que suelen no coincidir con lo que se evalúa y con el uso que se hace de los resultados. Se incluye la revisión de distintos modelos de evaluación Para mostrar los desfases entre objetivos y prácticas, es decir, la pobre relación de lo que se hace, con el modelo del declarado. Se tiende a enunciar que el objetivo de la evaluación está centrado en la mejora continua. Uno de los instrumentos más utilizados es el cuestionario, con el que se pretende hacer una evaluación precisa, pero que, por lo general, no evalúa el desempeño docente, sino, en el mejor de los casos, la opinión de los estudiantes. Si se declara que la evaluación debe servir para mejorar la práctica docente, convendría privilegiar el modelo constructivista que permitiría favorecer los cambios que se requieren a través de la reflexión que surja de la revisión de la autoevaluación, la hetero-evaluación y la co-evaluación

A ringed pole-on outflow from DO Tauri revealed by ALMA

We present new ALMA Band 6 observations including the CO (2-1) line and 1.3 mmcontinuum emission from the surroundings of the young stellar object DO Tauri. TheALMA CO molecular data show three different series of rings at different radial ve-locities. These rings have radii around 220 au and 800 au. We make individual fits tothe rings and note that their centers are aligned with DO Tauri and its optical high-velocity jet. In addition, we notice that the velocity of these structures increases withthe separation from the young star. We discuss the data under the hypothesis that therings represent velocity cuts through three outflowing shells that are possibly drivenby a wide-angle wind, dragging the environment material along a direction close to theline of sight (i= 19◦). We estimate the dynamical ages, the mass, the momentum andthe energy of each individual outflow shell and those of the whole outflow. The resultsare in agreement with those found in outflows from Class II sources. We make a roughestimate for the size of the jet/wind launching region, which needs to be of.15 au.We report the physical characteristics of DO Tauri?s disk continuum emission (almostface-on and with a projected major axis in the north-south direction) and its velocitygradient orientation (north-south), indicative of disk rotation for a 1-2 Mcentral star.Finally we show an HST [SII] image of the optical jet and report a measurement of itsorientation in the plane of the sky.Fil: Fernandez Lopez, Manuel. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; ArgentinaFil: Zapata Gonzalez, Luis Alberto. Universidad Nacional Autonoma de Mexico. Instituto de Astronomia; MéxicoFil: Rodríguez, Luis F.. Universidad Nacional Autonoma de Mexico. Instituto de Astronomia; MéxicoFil: Vazzano, María Mercedes. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; ArgentinaFil: Guzman, Andrés E.. National Astronomical Observatory Of Japan; JapónFil: López, Rosario. Universidad Autónoma de Barcelona. Facultad de Física. Departamento Astronomía y Meteorología; Españ

Cambios en los usos del suelo y producción de escorrentía en ramblas mediterráneas: Carraixet y Poyo (1956-1998)

[email protected] [email protected] trabajo analiza el efecto de los cambios recientes en los usos del suelo en la génesis de escorrentía en ramblas mediterráneas utilizando un SIG. Para el cálculo de la producción de escorrentía se ha utilizado el método desarrollado por el S.C.S. modificado por Témez (1978) que combina los mapas de pendientes, usos del suelo y grupo hidrológico del suelo. Se ha aplicado una adaptación del método propuesta por Camarasa et al. (2006) basado en la interpretación hidrogeomorfológica de la cuenca para la estimación del grupo hidrológico de suelo. Los resultados muestran una variabilidad espacial y temporal importante en la dinámica de producción de escorrentía, de forma que los valores promedio obtenidos para el conjunto de una cuenca enmascaran comportamientos diferentes según los sectores y dependiendo del período de tiempo.This paper attempts to determine the influence of recent land use changes on runoff production in Mediterranean ephemeral streams by means of GIS. The runoff threshold has been estimated by the US Soil Conservation Service method (1972) modified by Témez (1978) which combines values of slope, vegetation, land use and hydrological soil type. The method has been adapted by Camarasa et al. (2006) to estimate the hydrological soil type from the hydrogeomorphological characteristics of the catchment. The results show a very high spatial and temporal variability in runoff production. Overall values calculated for a catchment are not good indicators because they hide changes occurring in different sectors and tendencies that changes in periods of time

Możliwości mapowania partycypacyjnego w zakresie postrzeganych granic społeczności w centralnych Andach Ekwadorskich

This paper presents how participatory mapping can contribute to the understanding of the local meanings of community limits and perceptions about tenure security in agro-pastoral communities of the Andes, which participate in the payments for environmental services (PES) program. Literature about PES sustains that increasing tenure security might be an additional element of participating in such programs. We focused on the “Socio Páramo” conservation program to analyze how the inclusion of land in this program has infl uenced perception on limits and tenure security for the local communities. With two case studies in the high grasslands (páramo) of Ecuador, we fi rst used sketch maps to elicit how the area inscribed in the PES program has modifi ed the spatial structures of the community territory and what type of limits are found in this territory. Then, we conducted narrative walking to track GPS points with descriptions of land uses, perceived communitarian limits and narratives about meaning or concerns with regard to limits for the community and the relation between the legalized area inscribed in the PES program and tenure security. Maps were produced through GIS support and narratives were analyzed through thematic coding. The study reveals that: a) legal tenure obtained in frame of PES implementation is perceived as a pre-condition to participate in the program and has infl uenced positively or negatively land tenure security for the entire community; b) knowledge about community limits of páramo is the main concern for elder members, who regard this knowledge as the key element to maintain community cohesion. We conclude that participatory mapping is a powerful tool to elucidate concerns about limits, rules and control over land use and persistence of communitarian life, elements that should be considered when implementing PES.W artykule przedstawiono, w jaki sposób mapowanie partycypacyjne może przyczynić się do zrozumienia lokalnych znaczeń w zakresie ograniczeń społeczności i postrzegania bezpieczeństwa posiadania wśród rolno-pasterskich społeczności Andów, które uczestniczą w programie płatności z tytułu świadczeń na rzecz ekosystemu (PES). Literatura przedmiotu wskazuje, że zwiększenie bezpieczeństwa posiadania może być dodatkowym elementem uczestnictwa w takich programach. Autorzy skupili się na programie ochrony „Socio Páramo” w celu przeanalizowania, w jaki sposób włączenie gruntów do tego programu wpłynęło na kwestię postrzegania limitów oraz bezpieczeństwa wśród lokalnych społeczności. Zostały zrealizowane dwa studia przypadków na wysoko położonych pastwiskach (páramo) w Ekwadorze. Najpierw użyto map szkicowych, aby dowiedzieć się, w jaki sposób obszar wpisany w program zmodyfi kował struktury przestrzenne terytorium społeczności i jaki typ ograniczeń znajduje się w danej strukturze. Następnie przeprowadzono spacery narracyjne. Badanie ujawniło, że: a) tytuł własności gruntów uzyskany w ramach wdrażania programu jest postrzegany jako warunek wstępny uczestnictwa w programie; b) kwestia wiedzy na temat ograniczeń społeczności páramo jest głównym problemem w przypadku osób starszych, którzy uważają taką wiedzę za kluczowy aspekt, jeśli chodzi o utrzymanie spójności danej społeczności. Wnioskujemy, że mapowanie partycypacyjne jest skutecznym narzędziem służącym wyjaśnianiu obaw dotyczących ograniczeń, zasad i kontroli użytkowania gruntów oraz trwałości życia wspólnotowego, czyli elementów, które należy uwzględnić przy wdrażaniu PES

Fundamentals and Applications of Surface-Enhanced Raman Spectroscopy (SERS)

When a molecule is adsorbed on some metallic nanostructured surfaces such as silver, copper or gold, it can undergo an enormous enhancement of the Raman signal giving rise to the so called Surface-Enhanced Raman Scattering (SERS). The high sensitivity of this effect allows an accurate structural study of adsorbates at very low concentrations. The SERS effect has historically been associated with the substrate roughness on two characteristic length scales. Surface roughness on the 10 to 100 nm length scale supports localized plasmon resonances which are considered as the dominant enhancement mechanism of SERS (Electromagnetic Enhancement Mechanism: SERS-EM). It is usually accepted that these electromagnetic resonances can increase the scattered intensity by an average factor of ca. 104 to 107. A secondary mechanism often thought to require atomic scale roughness is referred to as Charge Transfer (CT) Enhancement Mechanism (SERS-CT). This mechanism involves the photoinduced transfer of an electron from the metal to the adsorbate or vice versa and involves new electronic excited CT states which result from adsorbate–substrate chemical interactions. It is also estimated that such SERS-CT mechanism can enhance the scattering cross-section by a factor of ca. 10 to 102. These two mechanisms can operate simultaneously, depending on the particular systems and experimental conditions, making difficult to recognize each one and to estimate their relative magnitude in a particular spectrum.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Análisis proteómico de la vía de señalización de CLEC-2 en plaquetas humanas mediante 2-D-DIGE y 2-DE combinado con tinción con SyproRubi: comparación de ambas aproximaciones experimentales

Comunicaciones a congreso

Vascular Smooth Muscle-Specific Progerin Expression Accelerates Atherosclerosis and Death in a Mouse Model of Hutchinson-Gilford Progeria Syndrome

Background: Progerin, an aberrant protein that accumulates with age, causes the rare genetic disease Hutchinson-Gilford progeria syndrome (HGPS). Patients who have HGPS exhibit ubiquitous progerin expression, accelerated aging and atherosclerosis, and die in their early teens, mainly of myocardial infarction or stroke. The mechanisms underlying progerin-induced atherosclerosis remain unexplored, in part, because of the lack of appropriate animal models. Methods: We generated an atherosclerosis-prone model of HGPS by crossing apolipoprotein E-deficient (Apoe(-/-)) mice with Lmna(G609G/G609G) mice ubiquitously expressing progerin. To induce progerin expression specifically in macrophages or vascular smooth muscle cells (VSMCs), we crossed Apoe(-/-)Lmna(LCS/LCS) mice with LysMCre and SM22Cre mice, respectively. Progerin expression was evaluated by polymerase chain reaction and immunofluorescence. Cardiovascular alterations were determined by immunofluorescence and histology in male mice fed normal chow or a high-fat diet. In vivo low-density lipoprotein retention was assessed by intravenous injection of fluorescently labeled human low-density lipoprotein. Cardiac electric defects were evaluated by electrocardiography. Results:Apoe(-/-)Lmna(G609G/G609G) mice with ubiquitous progerin expression exhibited a premature aging phenotype that included failure to thrive and shortened survival. In addition, high-fat diet-fed Apoe(-/-)Lmna(G609G/G609G) mice developed a severe vascular pathology, including medial VSMC loss and lipid retention, adventitial fibrosis, and accelerated atherosclerosis, thus resembling most aspects of cardiovascular disease observed in patients with HGPS. The same vascular alterations were also observed in Apoe(-/-)Lmna(LCS/LCS)SM22Cre mice expressing progerin specifically in VSMCs, but not in Apoe(-/-)Lmna(LCS/LCS)LysMCre mice with macrophage-specific progerin expression. Moreover, Apoe(-/-)Lmna(LCS/LCS)SM22Cre mice had a shortened lifespan despite the lack of any overt aging phenotype. Aortas of ubiquitously and VSMC-specific progerin-expressing mice exhibited increased retention of fluorescently labeled human low-density lipoprotein, and atheromata in both models showed vulnerable plaque features. Immunohistopathological examination indicated that Apoe(-/-)Lmna(LCS/LCS)SM22Cre mice, unlike Apoe(-/-)Lmna(G609G/G609G) mice, die of atherosclerosis-related causes. Conclusions: We have generated the first mouse model of progerin-induced atherosclerosis acceleration, and demonstrate that restricting progerin expression to VSMCs is sufficient to accelerate atherosclerosis, trigger plaque vulnerability, and reduce lifespan. Our results identify progerin-induced VSMC death as a major factor triggering atherosclerosis and premature death in HGPS.Work in Dr Andres' laboratory is supported by grants from the Spanish Ministerio de Economia, Industria y Competitividad (MEIC) (SAF2016-79490-R) and the Instituto de Salud Carlos III (AC16/00091, AC17/00067) with co-funding from the Fondo Europeo de Desarrollo Regional (FEDER, ``Una manera de hacer Europa´´), the Progeria Research Foundation (Established Investigator Award 2014-52), and the Fundacio Marato TV3 (122/C/2015). The MEIC supported Dr Hamczyk (´´Formacion de Personal Investigador´´ predoctoral contract BES-2011-043938) and Dr Villa-Bellosta (´´Juan de la Cierva´´ JCI-2011-09663 postdoctoral contract). The Instituto Universitario de Oncologia is supported by Obra Social Cajastur. The Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC) is supported by the MEIC and the Pro-CNIC Foundation, and is a Severo Ochoa Center of Excellence (award SEV-2015-0505).S