Reproducing the Bolund experiment in wind tunnel

The Bolund experiment has been reproduced in a neutral boundary layer wind tunnel (WT) at scale 1:115 for two Reynolds numbers. All the results have been obtained for an incoming flow from the 270o wind direction (transect B in the Bolund experiment jargon). Vertical scans of the velocity field are obtained using non-time resolved two components particle image velocimetry. Time-resolved velocity time series with a three component hot-wire probe have been also measured for transects at 2 and 5 m height and in the vertical transects at met masts M6, M3 and M8 locations. Special attention has been devoted to the detailed characterization of the inflow in order to reduce uncertainties in future comparisons with other physical and numerical simulations. Emphasis is placed on the analysis of spectral functions of the undisturbed flow and those of the flow above the island. The result?s reproducibility and trustworthiness have been addressed through redundancy measurements using particle image velocimetry, two and three components hot-wire anemometry. The bias in the prediction of the mean speed is similar to the one reported during the Bolund experiment by the physical modellers. However, certain reduction of the bias in the estimation of the turbulent kinetic energy is achieved. TheWT results of spectra and cosprectra have revealed a behaviour similar to the full-scale measurements in some relevant locations, showing that WT modelling can contribute to provide valid information about these important structural loading factors

Continuous-Wave Multiphoton Photoemission from Plasmonic Nanostars

Highly nonlinear optical processes, such as multiphoton photoemission, require high intensities, typically achieved with ultrashort laser pulses and, hence, were first observed with the advent of picosecond laser technology. An alternative approach for reaching the required field intensities is offered by localized optical resonances such as plasmons. Here, we demonstrate localized multiphoton photoemission from plasmonic nanostructures under continuous-wave illumination. We use synthesized plasmonic gold nanostars, which exhibit sharp tips with structural features smaller than 5 nm, leading to near-field-intensity enhancements exceeding 1000. This large enhancement facilitates 3-photon photoemission driven by a simple continuous-wave laser diode. We characterize the intensity and polarization dependencies of the photoemission yield from both individual nanostars and ensembles. Numerical simulations of the plasmonic enhancement, the near-field distributions, and the photoemission intensities are in good agreement with experiment. Our results open a new avenue for the design of nanoscale electron sources

Twisted Nano-optics: Manipulating Light at the Nanoscale with Twisted Phonon Polaritonic Slabs

Recent discoveries have shown that when two layers of van der Waals (vdW) materials are superimposed with a relative twist angle between their respective in-plane principal axes, the electronic properties of the coupled system can be dramatically altered. Here, we demonstrate that a similar concept can be extended to the optics realm, particularly to propagating polaritons, hybrid light-matter interactions. To do this, we fabricate stacks composed of two twisted slabs of a polar vdW crystal (MoO3) supporting low-loss anisotropic phonon polaritons (PhPs), and image the propagation of the latter when launched by localized sources (metal antennas). Our images reveal that under a critical angle the PhPs isofrequency curve (determining the PhPs momentum at a fixed frequency) undergoes a topological transition. Remarkably, at this angle, the propagation of PhPs is strongly guided along predetermined directions (canalization regime) with no geometrical spreading (diffraction-less). These results demonstrate a new degree of freedom (twist angle) for controlling the propagation of polaritons at the nanoscale with potential for nano-imaging, (bio)-sensing, quantum applications and heat management

New roles in Net Extended Learning Environments. A virtual learning environment experience of design in Higher Education

[ES] La Enseñanza Superior se plantea actualmente varios retos fundamentales como son la necesidad de un nuevo paradigma en la distribución y acceso al conocimiento, potenciar un acercamiento entre la formación académica y la profesional, e impulsar la innovación social que se produce de manera espontánea en la sociedad. En este contexto, los nuevos entornos de aprendizaje están basados en el uso de las TIC, que facilitan y promueven la comunicación entre usuarios activos, mientras diseñan un conjunto ordenado de objetos de aprendizaje. En esta línea, un equipo de profesores del Departamento de Urbanística y Ordenación del Territorio de la Universidad de Granada, a través de su Programa de Innovación Docente, ha desarrollado un nuevo entorno virtual de aprendizaje orientado a disciplinas de carácter técnico-proyectual, con el objetivo de potenciar una actitud creativa e innovadora en el alumnado. La plataforma web doyoucity.com ha sido diseñada como un entorno virtual de aprendizaje con objetos de aprendizaje repositados granularmente y dinámicas sociales, caracterizado por ser abierto, colaborativo e interactivo, destinado a personas interesadas en participar en el análisis, elaboración y crítica de propuestas innovadoras en el medio físico, en las escalas arquitectónica, urbana y territorial, con una fuerte presencia de la componente gráfica. Con el desarrollo de las tecnologías de la web 2.0 y la liberación de contenidos al acceso abierto y libre, surge la oportunidad de repensar los roles del profesorado y del alumnado en los procesos de enseñanza-aprendizaje a través de los entornos virtuales.[EN] Higher Education is currently facing some fundamental challenges such as the need for a new paradigm in the distribution and access to knowledge, empowering a rapprochement between academic and professional training, as well as promoting social innovation which spontaneously occurs in society. Within this context, the new educational environments are based on the use of ICT’s, which facilitate and promote communication between active users, while designing a well-organized set of Learning Objects. Hence, a team of teachers from the Department of Urbanism and Planning of the University of Granada, within their Teaching Innovation Program, has developed a new virtual learning environment mainly focused on technical and design subjects, where the main objective is encouraging creative and innovative attitudes in students.The web platform doyoucity.com has been designed as a Virtual Learning Environment with social dynamics and a granular design of its Learning Objects. Its setup is open, collaborative and interactive, aimed at people who are interested in participating in the analysis, development and critique of innovative proposals regarding the physical environment and architectural, urban and territorial scales with a strong graphical component. As a result of the development of the web technology 2.0 and the freeing up of contents, allowing free and open access to these contents, an opportunity to rethink teacher and student roles within the learning and teaching process through virtual environments.Osuna-Perez, F.; Abarca-Alvarez, FJ. (2013). Los nuevos roles en entornos educativos extendidos en Red. La experiencia de diseño de un entorno virtual de aprendizaje en Educación Superior. REDU. Revista de Docencia Universitaria. 11(2):353-372. https://doi.org/10.4995/redu.2013.5580OJS35337211

Detección del virus del mosaico suave del ñame mediante IC-RT-PCR en Cicadélidos, Rhynchosia minima y Dioscorea rotundata

In Colombia, yam (Dioscorea spp) is grown and is very important to be staple food for the inhabitants of the Caribbean Region. Viral diseases cause losses in production and are essential to identify the vectors involved in their dispersion. The aim of this study was to detect Yam mild mosaic virus (YMMV) in symptomatic samples of Dioscorea rotundata Poir, in weed Rhynchosia minima L. and adult leafhooppers associated with yam crops. Leaf samples of R. minima and D. rotundata cv. “Botón” and leafhoppers were collected. The YMMV was detected by IC-RT-PCR. The results showed that R. minima is a weed host of YMMV, in addition adults of Oncometopia sp, Mareja sp and Parathona cayennensis are able to acquire this virus and the presence of viruses in crops yam in the Colombian Caribbean region was confirmed.En Colombia, el ñame (Dioscorea spp) es cultivado y tiene gran importancia al ser alimento básico para los habitantes de la región Caribe. Las enfermedades de origen viral causan pérdidas en la producción y es fundamental identificar los vectores involucrados en su dispersión. El objetivo de este estudio fue detectar el Virus del mosaico suave del ñame (YMMV) en muestras sintomáticas de Dioscorea rotundata Poir, en el arvense Rhynchosia minima L. y en adultos de cicadélidos asociados al cultivo del ñame. Se tomaron muestras foliares en R. minima y D. rotundata cv. “Botón” y se colectaron cicadélidos. Se detectó el YMMV mediante IC-RT-PCR. Los resultados mostraron que R. minima es un arvense hospedero del YMMV, además que Oncometopia sp, Mareja sp y Parathona cayennensis son capaces de adquirir este virus y se confirma la presencia de virosis en los cultivos de ñame de la Región Caribe Colombiana

Mejora del proceso de requerimiento en contratación de bienes y servicios en la Universidad Nacional de Música, Lima 2022

La presente investigación tiene como objetivo general diseñar el proceso de mejora de requerimiento en contratación de bienes y servicios en la Universidad Nacional de Música, Lima 2022. La investigación es de tipo aplicada, de enfoque cuantitativo, el método es deductivo, de diseño no experimental- transversal y alcance descriptivo. Además, tuvo una población de 28 trabajadores administrativos los cuales respondieron una encuesta y obtuvimos como resultado el proceso de requerimiento en contratación de bienes y servicios presenta un nivel medio de 93% y un nivel bajo de un 7%. De acuerdo con la prueba T de student el resultado obtenido fue (p=0.00 < =0.05), lo que permite rechazar la hipótesis nula y se aprueba la hipótesis planteada con un Sig.: 0.979 por lo cual los datos siguen una distribución normal de acuerdo con la prueba Shapiro- Wilk. Se concluyó que existe falencias en el personal que elabora los TDR y ET, lo cual genera atraso en los tiempos y también es muy importante realizar las capacitaciones

Aerodynamic parametric analysis of an unconventional joined-wing aircraft configuration

In this paper, the experimental results of an unconventional joined-wing aircraft configuration are presented. The test model uses two different wings, forward and rear, both joined in tandem and forming diamond shapes both in plant and front views. The wings are joined in such a way that it is possible to change the rear wing dihedral angle values and the rear wing sweep angle values in 25 different positions that modify the relative distance and the relative height between the wings. To measure the system aerodynamic coefficients itis necessary to perform wind tunnel tests. The datapresented corresponds to the lift, drag and induced drag aerodynamic coefficients, as well as the aerodynamic efficiency and the parameter for minimum required power, from the calculated values of the lift and drag time series measured by a 6-axis force and torque sensor. The results show the influence on the aerodynamic coefficients of the rear wing sweep and dihedral angles parameters. As a main result, it can be concluded that, in general terms, the lift and induced drag aerodynamic coefficients values decrease as both the distance and height between the wings increase, on the other hand, the total drag aerodynamic coefficient decreases if the distance between the wings increases, but nevertheless shows a slight tendency to increase if the height of the rear wing increases, whereas the aerodynamic efficiency and the parameter for minimum required power increase if the distance between the wings increase

Centralities in the city border: a method to identify strategic urban-rural interventions

City borders perform an essential role in connecting towns and their surroundings. Being more a fuzzy area than a thin line, these urban borders gather together residential, tertiary and infrastructural uses, places awaiting development, agricultural fields, brown-field sites, abandoned areas etc. all named as ‘b-sites’. Within this context, we propose a method to identify places for strategic urban-rural interventions based on the assessment and identification of centralities in the urban-rural transition. Multiple centrality assessment is here presented as an innovative application considering both urban streets and rural road networks as a mixed network with identified central nodes. This innovative method has been tested in the city of Granada (Spain) allowing us to identify high centrality ‘b-sites’ where landscape project design and, urban-rural interventions could contribute to creating urban-rural transition continuity

Evaluation of an integrated system for classification, assessment and comparison of services for long-term care in Europe: the eDESDE-LTC study

The harmonization of European health systems brings with it a need for tools to allow the standardized collection of information about medical care. A common coding system and standards for the description of services are needed to allow local data to be incorporated into evidence-informed policy, and to permit equity and mobility to be assessed. The aim of this project has been to design such a classification and a related tool for the coding of services for Long Term Care (DESDE-LTC), based on the European Service Mapping Schedule (ESMS). Methods. The development of DESDE-LTC followed an iterative process using nominal groups in 6 European countries. 54 researchers and stakeholders in health and social services contributed to this process. In order to classify services, we use the minimal organization unit or "Basic Stable Input of Care" (BSIC), coded by its principal function or "Main Type of Care" (MTC). The evaluation of the tool included an analysis of feasibility, consistency, ontology, inter-rater reliability, Boolean Factor Analysis, and a preliminary impact analysis (screening, scoping and appraisal). Results: DESDE-LTC includes an alpha-numerical coding system, a glossary and an assessment instrument for mapping and counting LTC. It shows high feasibility, consistency, inter-rater reliability and face, content and construct validity. DESDE-LTC is ontologically consistent. It is regarded by experts as useful and relevant for evidence-informed decision making. Conclusion: DESDE-LTC contributes to establishing a common terminology, taxonomy and coding of LTC services in a European context, and a standard procedure for data collection and international comparison