446 research outputs found
Prediction of Photocurrent in Bifacial Photovoltaic Systems
No full textMotivated by the shift of the photovoltaic (PV) industry towards bifacial solar modules, desert markets, and ever narrower profit margins, this thesis study is aimed at improving the estimation accuracy of the output of bifacial PV systems that are potentially exposed to soiling. The scope is limited to the estimation of photocurrent, the performance parameter that is the most strongly affected by bifaciality and soiling. The thesis consists of three parts with the following topics: ground surface reflectance, module soiling, and bifacial effective irradiance.
As for the first topic, the thesis aims at providing tools for surface reflectance estimation in any use case. The model evaluation results that are based on a global database of reflectance measurements can be used to choose a reflectance model that is appropriate for the surface type of interest. On a global average, the results show that data-driven estimation reduces the mean absolute error of reflectance estimates by 20-40% compared to the literature values. The proposed geographically generalised parametrisations of reflectance models can be used to produce temporally variable reflectance estimates if measuring campaigns for local model calibration cannot be implemented. If they can, the thesis provides detailed guidelines for their optimal timing. The choice of the reflectance model can result in deviations of up to 2.5% in the energy yield estimated for a bifacial PV system.
In the second part of the thesis, a new physical model for forecasting soiling losses is proposed. The model incorporates new methods e.g., to simulate dust deposition on tilted surfaces, to physically capture the impact of relative humidity on dust accumulation, and to estimate the hemispherical transmittance of dust for diffuse light sources. The model can be used based on the public data products of numerical weather prediction models without the need for soiling measurements. The model is validated against its alternatives and measurements made at a field experiment in the United Arab Emirates. The impact of the soiling loss model on yield estimation is found to be lower than that of the reflectance model, plus minus 1% at maximum considering usual weekly or biweekly cleaning intervals.
Finally, the third part of the thesis proposes a new model for simulating the photocurrent of each solar cell of a bifacial PV power plant using a computationally efficient method. It comprises a new algorithmic design that makes it possible to make all the detailed geometric calculations once and move to the temporal domain only to estimate irradiance. The most important novelty of the proposed model is that it estimates the photocurrent contributions as a distribution of the different light sources. The model is validated against the measurements made in France and Italy. The results of the validation show that the model's current estimates are more accurate than those of the widely used "unlimited sheds" approach. The most important reasons for the better performance are the new model's capability to estimate the spatial variability of effective irradiance on the array surface and that of ground-incident irradiance around the system. As per the impact assessment, the new model was found to overestimate yield and underestimate electricity cost by 1% on average. The "unlimited sheds" approach, in turn, resulted in more variable bias. In the case of large arrays, the approach was found to overestimate yield by 4%.PV-LA
Relatório final de estágio realizado na Escola Secundária Matias Aires
No full textEste relatório reflete o processo de formação e a experiência vivida ao longo do estágio pedagógico decorrido na Escola Secundária Matias Aires e na Escola Básica Dom Domingos Jardo, no ano letivo 2022/2023. Ficam aqui realçadas as tarefas desempenhadas e as atividades desenvolvidas ao longo deste processo. Procede-se também a uma análise dos métodos e estratégias a que se recorreu para a otimização quer do processo de ensino-aprendizagem dos alunos da turma 9.º 6 e quer da participação no desporto escolar.
O estágio constituiu uma componente curricular que deu azo a vários momentos de aprendizagem e a vários momentos de análise, que me permitiram atingir um aperfeiçoamento enquanto docente. Foram diversas experiências enriquecedoras, que fizeram com que este processo de aprendizagem fosse absolutamente decisivo para a minha adaptação ao ambiente escolar.
Todo este processo teve por base as competências expostas ou apresentadas no Guia de Estágio Pedagógico. Que estão estruturadas em 4 áreas de intervenção: (Área 1) Organização e gestão do ensino e da aprendizagem; (Área 2) Inovação e investigação pedagógica; (Área 3) Participação na escola; e (Área 4) Relação com a comunidade.This report reflects the whole learning journey and lives experiences during the author's teaching internship at Escola Secundária Matias Aires and Escola Básica Dom Domingos Jardo in the 2022/2023 school year. The tasks performed and the activities carried out throughout this process are highlighted here. An analysis is also made of the methods and strategies employed to optimize both the learning experience that students in a ninth-grade class go through and their involvement in school sports.
Internship is an integral part of the teaching curriculum, providing extensive opportunity for learning and reflection and allowing the author to develop and gain new skills. The lived experiences invaluably helped the author adapt to the school environment and play a role as an educator.
This project was developed in light of the guidelines published in Guia de Estágio Pedagógico. They are divided into four intervention areas: (area 1) Teaching and Learning Organization and Management; (area 2) Teaching Innovation and Research; (area 3) Involvement in School Activities; and (area 4) Relationship with the Community
Relatório final de estágio realizado na Escola Secundária Matias Aires
No full textEste relatório reflete o processo de formação e a experiência vivida ao longo do estágio pedagógico decorrido na Escola Secundária Matias Aires e na Escola Básica Dom Domingos Jardo, no ano letivo 2022/2023. Ficam aqui realçadas as tarefas desempenhadas e as atividades desenvolvidas ao longo deste processo. Procede-se também a uma análise dos métodos e estratégias a que se recorreu para a otimização quer do processo de ensino-aprendizagem dos alunos da turma 9.º 6 e quer da participação no desporto escolar.
O estágio constituiu uma componente curricular que deu azo a vários momentos de aprendizagem e a vários momentos de análise, que me permitiram atingir um aperfeiçoamento enquanto docente. Foram diversas experiências enriquecedoras, que fizeram com que este processo de aprendizagem fosse absolutamente decisivo para a minha adaptação ao ambiente escolar.
Todo este processo teve por base as competências expostas ou apresentadas no Guia de Estágio Pedagógico. Que estão estruturadas em 4 áreas de intervenção: (Área 1) Organização e gestão do ensino e da aprendizagem; (Área 2) Inovação e investigação pedagógica; (Área 3) Participação na escola; e (Área 4) Relação com a comunidade.This report reflects the whole learning journey and lives experiences during the author's teaching internship at Escola Secundária Matias Aires and Escola Básica Dom Domingos Jardo in the 2022/2023 school year. The tasks performed and the activities carried out throughout this process are highlighted here. An analysis is also made of the methods and strategies employed to optimize both the learning experience that students in a ninth-grade class go through and their involvement in school sports.
Internship is an integral part of the teaching curriculum, providing extensive opportunity for learning and reflection and allowing the author to develop and gain new skills. The lived experiences invaluably helped the author adapt to the school environment and play a role as an educator.
This project was developed in light of the guidelines published in Guia de Estágio Pedagógico. They are divided into four intervention areas: (area 1) Teaching and Learning Organization and Management; (area 2) Teaching Innovation and Research; (area 3) Involvement in School Activities; and (area 4) Relationship with the Community
CVS-Vintage: A dataset of 14 CVS repositories of java software
No full text<p>CVS-Vintage is a dataset of 14 CVS repositories of Java applications. This dataset aims at supporting the replication of early papers in the field of software evolution and mining software repositories. By building this dataset, we saved some CVS repositories from a probable death by deletion.</p>
<pre>@techreport{monperrus:hal-00769121,
title = {CVS-Vintage: A Dataset of 14 CVS Repositories of Java Software},
author = {Monperrus, Martin and Martinez, Matias},
url = {https://hal.archives-ouvertes.fr/hal-00769121/file/paper.pdf},
year = {2012},
number = {hal-00769121},
institution = {HAL},
}</pre>
<p>A Git version is available at https://github.com/monperrus/cvs-vintage/</p>
Land CSEM impulse responses in simple layered models
No full textWe argue that in a half space model with a single layer, the electric field impulse response at different offsets can be understood physically. Diffusive fields travel along paths like wavefields but are not localised in time. Each event that is measured comes from a path with the least attenuation, which corresponds to early arrival. The most prominent TE mode contribution to the detection of a subsurface layer comes from the coupling of the airwave with the subsurface. The most prominent contribution from the TM mode comes from the path through the resistive layer with almost vertical diffusion paths between the surface and the target. The arrival time of the peak of the event from a conductive layer can be understood from this reasoning. The arrival time of the peak of the event from a resistive layer can be understood from this reasoning when the offset is not too large compared with burial depth of the target layer. These predictions lead to estimates of depth to target layer with an error of less than 5% and the resistivity of the resistive layer of less than 50%. The information contained in the impulse responses suggests that inversion would yield good results.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Applied Geophysics and Petrophysic
Environmental application of basic oxygen furnace slag for the removal of heavy metals from leachates
No full textIndustrial waste is a major environmental concern nowadays, stimulating the thorough study of the minimization and recycling of solid wastes and of the containment and treatment of liquid contaminants. Basic oxygen furnace (BOF) slag, a solid waste from the steel industry, has been found to be effective in the removal of heavy metals. However, this has not been applied so far in low permeability barriers, such as those used as bottom liners in landfills. This work studies the performance of BOF slag in both containment and treatment technologies for toxic leachates. Flow models are developed to assess the transport of metal ions through a permeable reactive barrier and a composite clay barrier. Reactive transport through the slag barrier and adsorption in the clay barrier are coupled for different conditions to find the residence time, the barrier life span and the optimum operative conditions. The results show that the use of BOF slag increases the breakthrough time of the contaminants, enabling improve design of low and high conductivity reactive barriers, and expands the life cycle of the material.Fil: Francisca, Franco Matias. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Estudios Avanzados en Ingeniería y Tecnología. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto de Estudios Avanzados en Ingeniería y Tecnología; ArgentinaFil: Glatstein, Daniel Alejandro. Universidad Nacional de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
The Importance of Being Heard in Public Hearings on Advisory Opinions Submitted to the Inter-American Court of Human Rights
No full textEn esta nota, el autor analiza la función consultiva de la Corte Interamericana de Derechos Humanos, otorgando ejemplos de la importancia que esta función ha tenido en el ámbito interno de algunos países de la región, y realizando una comparación desde el punto de vista formal y práctico sobre la diferencia entre las audiencias públicas llevadas a cabo en el trámite de los casos contenciosos y en el de las opiniones consultivas. Asimismo, relata su experiencia al participar en audiencias públicas en ambos tipos de procedimientos.In this commentary, the author analyzes the advisory function of the Inter-American Court of Human Rights, providing examples of the importance that this function has had in the domestic sphere of some countries in the region, and making a comparison from the formal and practical point of view on the difference between the public hearings carried out on contentious cases and advisory opinions. He also shares his experience participating in public hearings in both types of proceedings.Fil: Consonni, Matias. Universidad de la República de Uruguay; Urugua
Criticism of the "mental experiment" by David Held
No full textEn este breve ensayo nos abocamos a examinar críticamente la propuesta teórica formulada por David Held acerca de las posibilidades de constitución de una “democracia cosmopolita”. Para ello, presentamos su argumento estructurado en torno a tres principios fundamentales: el principio de la autonomía traducido como la capacidad de participación en debates públicos, el principio de la conformación de un Estado legal democrático y el principio de una democracia cosmopolita resultante de los anteriores. Luego, damos paso a la crítica del “experimento mental” que sugiere el autor como ejercicio mediante el cual puede explorarse la potencialidad de la autonomía en la estructuración de las sociedades contemporáneas.In this short paper we apply ourselves to critically examine the teoretical proposal by David Held about the possibilities of formation of a “cosmopolitan democracy”. To this end, we present the argument structured around three main principles: the principle of autonomy translated as the ability to participate in public debates, the principle of the creation of a democratic legal state and the principle of a cosmopolitan democracy resulting from the above. Then, give way to criticism of the “mental experiment” suggested by the author as an exercise by which you can explore the potentiality of autonomy in structuring contemporary societies.Fil: Cristobo, Matias. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones y Estudios sobre Cultura y Sociedad. Universidad Nacional de Córdoba. Centro de Investigaciones y Estudios sobre Cultura y Sociedad; Argentin
Identification and characterization of a novel monooxygenase from Burkholderia xenovorans LB400
No full textWhole genome sequences have been key elements in discovering new genes and in predicting protein function. A gene found in Burkholderia xenovorans LB400 encodes a protein that is 77% identical and 85% similar to the p-cymene monooxygenase from Pseudomonas putida F1. Phylogenetic analysis of this enzyme reveals that it is closely related to cymene, xylene and alkane monooxygenase. Protein alignment of these sequences identified 10 conserved histidine residues, of which 8 were reported to be essential for catalysis in alkane monooxygenase. The identified consensus sequence for these enzymes is [HX(3)HX(25)HX(3)HHX(139)HX(2)HH], which is characteristic of membrane-bound hydroxylases with an active site that require iron and the activation of molecular oxygen for their catalytic cycle. In order to analyze the B. xenovorans LB400 monooxygenase enzyme in more detail, we cloned the cognate genes into the expression vector pQE.30 and performed biotransformation assays to determine the substrate specificity of the CymA1A2-like enzyme. The novel monooxygenase found in LB400 hydroxylates p-cymene to the product p-cymen-8-ol. The cymene monooxygenase found in P. putida F1 hydroxylated the methyl group of p-cymene, while the novel monooxygenase catalyzed the hydroxylation of the carbon of the isopropyl group adjacent to the benzene ring. The enzyme also oxidized the substrates cumene, isobutylbenzene, n-butylbenzene, propylbenzene, 1, 4-diisopropylbenzene, tert-butyltoluene, sec-butylbenzene, and 4-ethyltolunene in addition to p-cymene. The collected data indicate that the LB400 monooxygenase described above is able to catalyze an interesting and novel reaction, but its physiological role is still unidentified. Steric hindrance and chain length definitely play an important role in determining the enzyme specificity. Metabolite analysis and RT-PCR data indicated that there is no correlation between the novel enzyme activity and growth of the strain on p-cymene, propylbenzene, 1,4-diisopropylbenzene, 4-ethyltoluene, n-butylbenzene, isobutylbenzene, sec-butylbenzene, tert-butylbenzene, and tert-butyltoluene. Other pathways and enzymes are involved in the degradation of these substrates. This data indicates that although bioinformatic analysis is a valuable tool in protein analysis and function prediction, it cannot always accurately predict the catalytic activity and physiological role of an enzyme.Ph.D.Includes bibliographical references (p. 120-127)
On the modulation of low-order roughnesses on the flow over low-order topographies
No full textThe impact of low-order roughness on low-order topographies was experimentally explored using high-resolution particle image velocimetry in a refractive-index-matching channel at Reynolds numbers Re = 40,000, based on the channel half height and the bulk velocity. The topographies consisted on 2D and 3D sinusoidal waves, which spanned most of the test section. The roughnesses also consisted on the same waveforms but one order of magnitude smaller than the topographies. We focused on 2D-2D and 3D-3D roughness-topography configurations. The flow statistics are compared with hydrodynamically smooth wavy topographies to get insight on the effects of the 2D and 3D roughnesses. Inspection of the flow statistics reveal that the low-order roughness induced changes in the velocity fluctuations near the wall; mean flow was not substantially modified. In particular, the Reynolds stress decomposition via quadrant analysis revealed that the 2D roughness reduced the sweeps and ejections in the 2D topography; however, negligible changes occurred in the 3D case. Inspection of the flow fluctuations with Proper orthogonal decomposition at various spatial regions revealed that the 3D roughness increased the complexity of the flow, attributed possibly to the generation of small-scale motions located within the troughs.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2021-05-01The student, Matias Colombo Baeza, accepted the attached license on 2019-04-24 at 12:20.The student, Matias Colombo Baeza, submitted this Thesis for approval on 2019-04-24 at 12:28.This Thesis was approved for publication on 2019-04-25 at 12:11.DSpace SAF Submission Ingestion Package generated from Vireo submission #13877 on 2019-08-22 at 16:23:50Made available in DSpace on 2019-08-23T20:48:25Z (GMT). No. of bitstreams: 3
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Previous issue date: 2019-04-25Embargo set by: Seth Robbins for item 112382
Lift date: 2021-08-23T20:48:32Z
Reason: Author requested closed access (OA after 2yrs) in Vireo ETD systemLimited Restriction Lifted for Item 112382 on 2021-08-24T09:15:38Z
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