Innovative solutions for intersection of TBM tunnel and station in Riyadh Line 5 metro

One of the main problems when constructing a metro line using a tunnel boring machine (TBM) is the coordination of the construction of the tunnel with the excavation of the stations that it will intersect, being possible to reach the stations before their complete excavation. This paper presents a solution to this problem, one which has been implemented in the Riyadh Metro L5. This solution allows the construction of the tunnel and the later excavation of the station, while maintaining the operation of the TBM and the tunnel lining.Peer ReviewedPostprint (author's final draft

Copper Indium Sulfide Quantum Dots as Nanomanometers: Influence of Size and Composition

Mechanical forces control the function of organisms and mediate theinteraction between biological systems and their environments. Knowledge ofthese forces will increase the understanding of biological processes and cansupport the development of novel diagnostic and therapeutic procedures.Although techniques like atomic force microscopy and droplet insertionmethod allow measuring forces over a broad range of values, they are invasiveand lack versatility. A promising way to overcome these hurdles isluminescent nanomanometry. Quantum dots (QDs) specifically have opticalproperties that depend on their size because of the quantum confinement,which makes them responsive to applied forces. Yet, a fine understanding ofhow fundamental parameters affect the response to applied stress is requiredbefore a QD family can be credibly proposed as luminescentnanomanometers. Here, a thorough study is conducted on how size andstoichiometry affect the nanomanometry performance of CuInS2QDs. Thestudied QDs feature pressure-dependent photoluminescence in thered/near-infrared range, which can enable the measurement of mechanicalforces in the range of physiological relevance in a remote and minimallyinvasive way. It is shown that tuning size and stoichiometry cansimultaneously enhance the CuInS2QDs’ brightness and response to appliedpressure, thus providing guidelines for better luminescent nanomanometers

Language-agnostic online judge for programming learning

Trabajo de Fin de Grado en Ingeniería Informática e Ingeniería del Software, Facultad de Informática UCM, Departamento de Sistemas Informáticos y Computación, Curso 2021/2022. En los siguientes repositorios se encuentra el código del cliente de escritorio y del servidor: https://github.com/ScholarJudge/ClientApp https://github.com/ScholarJudge/ServerAppScholarJudge es un juez de programación que permite a los estudiantes practicar cualquier lenguaje de programación que estén aprendiendo. A diferencia de otros jueces tradicionales, en ScholarJudge la solución se ejecuta en el lado del cliente y, posteriormente, se envía al servidor para validar su corrección. Durante este proyecto se han desarrollado un servidor, un cliente de escritorio y una aplicación web. El cliente de escritorio permite a los estudiantes obtener los problemas y enviar sus soluciones, y la aplicación web permite a los profesores crear nuevos problemas y almacenarlos en el servidor. La comunicación entre clientes y servidor se realiza mediante una API REST. Para acceder a las aplicaciones web y de escritorio es necesario registrarse primero. En los siguientes repositorios se encuentra el código del cliente de escritorio y del servidor: https://github.com/ScholarJudge/ClientApp https://github.com/ScholarJudge/ServerAppLanguage-agnostic online judge for programming learning ScholarJudge is a programming judge that allows to students to practice any programming language they are learning. Unlike other traditional judges, in ScholarJudge the solution is executed on the client side and then sent to the server to validate its correctness. During this project, a server, a desktop client and a web application have been developed. The desktop client allows students to get problems and send their solutions, and the web application allows teachers to create new problems and save them in the server. Comunication between clients and server is done through a REST API. To access the web and desktop applications you need to register first. The server and desktop client code is located in the following repositories: https://github.com/ScholarJudge/ClientApp https://github.com/ScholarJudge/ServerAppDepto. de Sistemas Informáticos y ComputaciónFac. de InformáticaTRUEunpu

A new near-IR luminescent erbium(III) complex with potential application in OLED devices

We report the synthesis and X-ray structural characterization of the new Er3+ ternary complex [Er(hd)3(bipy)] (where Hhd is 3,5-heptanedione and bipy is 2,2′-bipyridine) as well as its absorption/luminescent properties. X-ray analysis of the novel complex reveals its triclinic centrosymmetric structure with two symmetry independent complexes in the unit cell. Each lanthanide ion is surrounded by 6 oxygen atoms and 2 nitrogen atoms in a square antiprismatic geometry. The solid-state electronic absorption spectra and the luminescence spectrum show long-wavelength 4f–4f transitions which provide a potential use of the compound as a NIR emitting material in organic light-emitting devices (OLEDs)

Optical nanothermometer based on the calibration of the Stokes and upconverted green emissions of Er3+ ions in Y3Ga5O12 nano-garnets

The temperature-dependent green luminescence of Y3Ga5O12 nano-garnets doped with different concentrations of Er3+ ions has been measured from 300 to 850 K and, in more detail, in the biological range from 292 to 335 K. The green emissions were obtained by excitation under 488 nm blue or 800 nm near-infrared laser radiations. Both excitations give rise to bright green luminescence that can be seen by the naked eye, and which can be associated either with Stokes processes, i.e. multiphonon relaxations followed by green spontaneous emission, in the former case or with infrared-to-visible upconversion processes in the latter. The temperature-induced changes in the Er3+ green emissions have been calibrated for both excitations and results point to a strong dependence on the concentration of optically active Er3+ ions. The maximum value of the thermal sensitivity, 64 × 10−4 K−1 at 547 K, has been obtained for the nano-garnets doped with the lowest concentration of Er3+ ions, which is one of the highest values found in the literature. These results allow to conclude that a relatively low concentration of optically active ions is advisable and the changes induced by temperature on the green emissions are independent of the laser excitation radiation used, which is necessary to calibrate the temperature of the immediate environment of the Er3+-doped Y3Ga5O12 nano-garnets.This work have been partially supported by Ministerio de Economía y Competitividad de España (MINECO) under The National Program of Materials (MAT2010-21270-C04-02/-03, and MAT2013-46649-C4-3-P/-4-P), The Consolider-Ingenio 2010 Program (MALTA CSD2007-00045), and the Indo- Spanish Joint Programme of Cooperation in Science and Technology (PRI-PIBIN-2011-1153/DST-INT-Spain-P-38-11), and by the EU-FEDER funds. V. Venkatramu is also grateful to Council of Scientific and Industrial Research (CSIR), New Delhi for the sanction of major research project (No. 03(1229)/12/EMR-II, dated: 16th April, 2012). V. Monteseguro wishes to thank MICINN for the FPI grant (BES-2011- 044596)

Revuelta de octubre y neoliberalismo chileno

En la revuelta popular, iniciada el 18 de octubre de 2019 en Chile, confluyen una serie de demandas sociales, vinculadas a demandas históricas de los movimientos sociales que han emergido durante las últimas décadas en el país. Las principales demandas identificadas en la Encuesta Zona Cero del Núcleo de Sociología Contingente (2020) corresponden a Pensiones, Salud y Educación. La crítica a estos sistemas sociales se ha presentado históricamente en el Movimiento No+AFP, el Movimiento Estudiantil y las movilizaciones por la salud pública de calidad. Tales sistemas sientan sus bases durante la dictadura militar, en la cual se instala el neoliberalismo en Chile, orientado hacia la privatización de derechos sociales y el rol subsidiario del estado. En el presente documento se desarrolla el vínculo entre las demandas sociales de la revuelta de octubre y la introducción del modelo neoliberal en dictadura, el cual ha sido profundizado en la postdictadura. Se analiza esta relación desde los conceptos de movimientos sociales, identidad colectiva y demandas. Se reconoce la profundización de la desigualdad y la precarización de la vida, manifestadas en las movilizaciones de octubre, como consecuencias de la privatización de derechos, mercantilización de la vida y el abandono estatal, procesos introducidos con el modelo neoliberal instalado y profundizado en dictadura y postdictadura, respectivamente. Además, se identifica un quiebre de la individualización y la emergencia de una identidad colectiva a raíz de la movilización popular.Fil: Delaveau Bascopé, Alejandra. Universidad de Chile.Fil: Díaz Cepeda, Camila. Universidad de Chile.Fil: Flores Lavín, Catalina. Universidad de Chile.Fil: Jiménez Acevedo, Víctor. Universidad de Chile.Fil: Leyton Inostroza, Vanessa. Universidad de Chile

Empleo de herramientas de simulación con fines docentes para desarrollar prácticas de sistemas altamente distribuidos

El objetivo de este proyecto consiste en mitigar los problemas existentes para ejecutar aplicaciones distribuidas en las prácticas de la asignatura Programación de Sistemas Distribuidos. Para ello proponemos el uso del simulador SIMCAN, el cual ha sido validado contra arquitecturas reales. Concretamente, se propone adaptar este simulador, desarrollado en el contexto de la investigación, para fines docentes. Seguidamente, se utilizará la versión adaptada de SIMCAN en las prácticas de la asignatura Programación de Sistemas Distribuidos, del grado de Ingeniería de Computadores de la FDI/UCM

Role of rare earth sites and vacancies in the anomalous compression of modulated scheelite tungstates

X-ray powder diffraction experiments at high pressures combining conventional sources and synchrotron radiation, together with theoretical simulations have allowed us to study the anomalous compression of the entire α-RE2(WO4)3 (RE = La-Ho) family with modulated scheelite structure (α phase). The investigated class of materials is of great interest due to their peculiar structural behavior with temperature and pressure, which is highly sought after for specialized high-tech applications. Experimental data were analyzed using full-profile refinements and were complemented with computational methods based on density functional theory (DFT) total energy calculations for a subset of the samples investigated. An unusual change in the compression curves of the lattice parameters a, c, and β was observed in both the experiments and theoretical simulations. In particular, in all the studied compounds the lattice parameter a decreased with pressure to a minimum value and then increased upon further compression. Pressure evolution of the experimental x-ray diffraction (XRD) patterns and cell parameters is correlated with the ionic radius of the rare earth element: (1) the lighter La-Nd tungstates underwent two phase transitions, and both transition pressures decreased as the rare earth's ionic radius increased. The XRD patterns of the first high pressure phase could be indexed with propagation vectors parallel to the a axis (tripling the unit cell). At higher pressures, the lattice parameters for the second phase (referred to as the preamorphous phase) showed little variation with pressure. (2) The heavier tungstates, from Sm to Dy, undergo a transition to the preamorphous phase without any intermediate phase. The reversibility of both phase transitions was investigated. DFT calculations support this unusual response of the crystal structures under pressure and shed light on the structural mechanism of negative linear compressibility (NLC) and the resulting softening. The pressure dependence of the structural modifications is related to tilting, along with small elongation and alignment, of the WO2−4 tetrahedrons. These changes correlate with those in the alternating RE…RE…RE chains and blocks of cationic vacancies arranged along the a axis. Possible stacking defects, which emerge between them, helped to explain this anomalous compression and the pressure induced amorphization. Such mechanisms were compared with other ferroelastic families of molybdates, niobates, vanadates, and other compounds with similar structural motifs classified as having “hinge frames.

Diseño y despliegue de un clúster de placas Raspberry Pi3 para la ejecución de las prácticas de la asignatura PSD

Este proyecto tiene como objetivo principal facilitar el desarrollo de las prácticas de la asignatura Programación de Sistemas Distribuidos (PSD), impartida en el grado en Ingeniería de Computadores de la FDI. Esta propuesta surge como continuación del proyecto de innovación docente concedido en el curso 16/17, en el cual se utilizó la herramienta de simulación SIMCAN para estudiar y analizar distintos tipos de sistemas distribuidos en las prácticas de la asignatura PSD