1,722,829 research outputs found
La inclusión de la mujer en el sistema educativo desde la dictadura hasta la actualidad
No full textGaroña Ruiz, Manuel Felipe; director de proyecto: Lázaro Alcalde, Miguel2024-2025Máster Universitario en Profesorado de Educación Secundaria Obligatoria y Bachillerato, Formación Profesional y Enseñanza de IdiomasFacultad de Ciencias de la Educació
Assessing Non-state Climate Action in Big Businesses: Evaluating Fortune Global 500 companies in the SBTi and RE100 initiatives
No full textSeveral studies have posed that international cooperative initiatives lead by businesses could aid in mitigating global warming in ways that are additional to national policies. However, evaluations on their progress are rare due to many informational issues. This research gap is worrisome since such initiatives can also have negative effects on global commitment due to effort fragmentation and greenwashing.This thesis evaluates progress in two initiatives that have featured prominently in the literature: the Science Based Targets initiative (SBTi) and RE100. The group of companies evaluated was reduced to the Fortune Global 500, a ranking of the largest firms by revenue. Large datasets were created with the targets set by these companies, their emissions and energy use, among others. Progress was evaluated in four aspects: the ambition of targets, the robustness of their disclosure of sustainability metrics, the implementation of changes to their energy profiles, and finally the substantive progress seen in their collective carbon footprint.It was found that among the two initiatives, SBTi appears posed for larger emissions mitigation, while RE100 is better at promoting more effective renewable energy purchasing practices. However, direct emission reductions are mostly concentrated on a reduced number of firms in energy intensive sectors, with the remaining members focusing on reductions through indirect methods that might not be additional at the global level. Similarly, it was found that informational barriers remain high even in these firms, with a plethora of inconsistencies that complicate year-by-year comparisons.Citation: Ruiz Manuel, Ivan (2021). Assessing non-state climate action in big businesses: evaluating Fortune Global 500 companies in the SBTi and RE100 initiatives. Master thesis, Delft University of Technology.Electrical Engineering | Sustainable Energy Technolog
Estudio multidisciplinar para la introducción del patrimonio natural y cultural andaluz en los currículos de la ESO y del bachillerato
No full textEntre las zonas estudiadas se encuentra el P.N. de la Sierra Norte (en Sevilla) y los P.N. de la Sierra de Cardeña y Montoro y de las Sierras Subbéticas (en Córdoba) no obstante, el abundante material disponible y su proximidad recomienda su estudio detenido y su inclusión en una hipotética tercera parte del proyecto que será solicitada en la convocatoria de este año 2007Se describe el desarrollo de un proyecto de dos años de duración en el que se han llevado a cabo visitas a diversos Parques Naturales, y se han realizado una serie de trabajos planteados por los componentes del proyecto en las diferentes zonas visitadas.Instituto de Educación Secundaria Santos Isasa; Plaza Plano de la Feria s. n.; Montoro (Córdoba); +34957199915; +34957199921; [email protected]
Numerical Simulation and Aerodynamic Design of Small-Scale Rotary-Wing for Unmanned Aerial Systems in Terrestrial and Martian Applications
Full text linkL'abstract è presente nell'allegato / the abstract is in the attachmen
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Experimental Validation of Virtual Wind Tunnel Testing for Ultra-low Reynolds Numbers Flows
Full text linkThe recent success of the Ingenuity Mars helicopter developed by the jet propulsion laboratory (JPL) demonstrated the feasibility of the Martian flight. Low pressure (660 Pa) and temperature (210 K) characterize the ground-level Martian atmosphere. Since such conditions are difficult and expensive to mimic on Earth, it is necessary to have reliable simulation tools that can correctly reproduce Martian aerodynamics. In the case of unmanned aerial systems (UAS), the latter is characterized by a high subsonic Mach number at the tip of the blades and an Ultra-low Reynolds number regime. To this purpose, the laminar solver embedded in the commercial CFD code STAR CCM+ was validated by reproducing experiments carried out in the Martian Wind Tunnel at Tohoku University using a triangular airfoil wing at Reynolds 3000 and a Mach number of 0.5. Simulations are performed at angles of attack ranging from 0 to 16 degrees showing a satisfactory agreement with experimental results for very different flow conditions
Validation of the γ-Re θ Transition Model for Airfoils Operating in the Very Low Reynolds Number Regime
Full text linkMicro Aerial Vehicles (MAVs) are state of the art in the aerospace industry and are involved in many operations. The reduced dimensions of these vehicles generate very low Reynolds number conditions in which separation-induced transition typically occurs. The extremely large computational cost of scale resolving simulations, which are capable of capturing laminar to turbulent transition, is prohibitive for most engineering and design applications. Therefore, it becomes very interesting to couple transition models with conventional Reynolds Averaged Navier–Stokes (RANS) simulations to allow the prediction of transition to turbulence at a reduced computational cost. This paper performs an investigation of the application of the γ-Re θ transition model analysing different empirical correlations available in literature and studying the influence of the relevant model parameters using the commercial Computational Fluid Dynamics (CFD) code STAR-CCM+. The flow around the Eppler 387, Selig/Donovan 7003 and Ishii airfoils has been studied for different Reynolds numbers and angles of attack comparing the drag and lift forces and separation bubble characteristics with experimental and numerical results reported in literature
ROT8: A Matlab App for Low Reynolds number Airfoil and Rotor Aerodynamic Design
Full text linkThe proposed software aims to solve the increase in demand for rotor design modules generated by the exponential growth of applications involving Unmanned Aerial Systems (UASs). We offer a variety of aerodynamic solvers for rotor flows with different fidelities, including a Blade Element Momentum (BEM) method, a Free Vortex Wake (FVW) method, a Vortex Particle Method (VPM), and a data-driven approach based on experimental data. allows the calculation of airfoil polars necessary for the aforementioned Reduced Order Models (ROMs) using XFOIL. This general framework can be applied to rotors, propellers, and horizontal-axis wind turbines. The code is a Matlab App that allows using different optimization algorithms for design purposes. The code is intended to be versatile, with straightforward default settings for academic use but allowing the definition of user-defined functions to increase the level of interaction with the code for advanced research purposes
Hybrid Fidelity Optimization of Efficient Airfoils and Rotors in Ultra-Low Reynolds Numbers Conditions
Full text linkThe unmanned aerial systems (UAS) design for flight in the Martian atmosphere is thriving. This paper discusses the aerodynamic optimization of airfoils and blades at ultra-low Reynolds number conditions. In the case of airfoils, the performance predictions are carried out using unsteady Computational Fluid Dynamics (CFD). We analyzed the influence of the Reynolds number on optimal geometries and proposed a globally efficient airfoil. We computed the polar of these airfoils to generate an aerodynamic database as they are necessary for rotor reduced-order models. This work focuses on optimizing and comparing two and 3-bladed rotors. We used the Blade Element Method (BEM) to generate efficient geometries employing a genetic algorithm and evaluated the resultant geometries with higher fidelity CFD simulations. Final refinement of the presented geometries is performed with a CFD adjoint optimization
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