Mejoras al dimensionamiento óptimo de sistemas híbridos con energías renovables

En lugares remotos la electrificación convencional no se puede implementar debido a la topografía del lugar y a los elevados costes de infraestructura. En este caso, el uso de sistemas de energías renovables es una solución viable a este problema. La integración de dos o más fuentes de energías renovables es más fiable que la generación con una sola fuente. Esta integración se conoce como sistema híbrido. El correcto dimensionamiento técnico del sistema y la adopción de técnicas de optimización asegura la viabilidad tecnológica y económica del sistema híbrido. Estudios sobre el dimensionamiento técnico, análisis técnico-económico, modelado y simulación de sistemas híbridos han sido realizados en comunidades aisladas. Pero un número muy reducido de trabajos contemplan la integración de turbinas hidrocinéticas, que se considera en la presente tesis. De hecho, las principales aportaciones de esta tesis se han centrado en el desarrollo de nuevos modelos de componentes para un sistema híbrido completo en el entorno MATLAB-Simulink.In remote places, conventional electrification cannot be implemented due to the topography of the place and the high infrastructure costs. In this case, the use of renewable energy systems is a viable solution to this problem. The integration of two or more renewable energy sources is more reliable than the generation with a single source. This integration is known as a hybrid system. The correct technical sizing of the system and the adoption of optimization techniques ensures the technological and economic viability of the hybrid system. Studies on the technical sizing, economic technical analysis, modeling and simulation of hybrid systems have been carried out in isolated communities. But a very small number of works contemplate the integration of hydrokinetic turbines, which is contemplated in this thesis. New component models have been developed for a complete hybrid system in the MATLAB-Simulink environment.Tesis Univ. Jaén. Departamento de Ingeniería Eléctrica. Leída el 8 de marzo 2019

Incidencia de los proyectos de Vinculación con la Sociedad de la Universidad Politécnica Salesiana. Vol 2

Con este mismo título, en diciembre de 2021, apareció el primer volumen de este trabajo. La intención fue sistematizar algunos proyectos de vinculación que habían logrado impactos sociales en términos cualitativos y de innovación educativa. En esa oportunidad se presentó una obra con diez capítulos de reflexión, sistematización, análisis y descripción de la trascendental importancia que implica, para la UPS, la vinculación con la sociedad. Ahora, al cumplir la UPS 28 años de vida institucional, presentamos este segundo volumen, que recoge en 14 capítulos el trabajo de 3 docentes, administrativos, estudiantes e investigadores invitados de distintos campos científicos. Es la continuación de la sistematización de los proyectos de vinculación emblemáticos que se han desarrollado en las sedes de Cuenca, Quito y Guayaquil de la universidad. EN cada uno de ellos se podrá encontrar el esfuerzo que la UPS ha desarrollado en estos 28 años, desde su fundación, para conseguir transformaciones sociales. Fiel a su misión y visión institucional, ha desplegado un arduo trabajo en el capo científico, tecnológico y cultural, dándose a conocer como una institución de excelencia académica, producción científica, responsabilidad social y capacidad de incidir en el desarrollo de la sociedad ecuatorian

Search for new particles in events with energetic jets and large missing transverse momentum in proton-proton collisions at root s=13 TeV

A search is presented for new particles produced at the LHC in proton-proton collisions at root s = 13 TeV, using events with energetic jets and large missing transverse momentum. The analysis is based on a data sample corresponding to an integrated luminosity of 101 fb(-1), collected in 2017-2018 with the CMS detector. Machine learning techniques are used to define separate categories for events with narrow jets from initial-state radiation and events with large-radius jets consistent with a hadronic decay of a W or Z boson. A statistical combination is made with an earlier search based on a data sample of 36 fb(-1), collected in 2016. No significant excess of events is observed with respect to the standard model background expectation determined from control samples in data. The results are interpreted in terms of limits on the branching fraction of an invisible decay of the Higgs boson, as well as constraints on simplified models of dark matter, on first-generation scalar leptoquarks decaying to quarks and neutrinos, and on models with large extra dimensions. Several of the new limits, specifically for spin-1 dark matter mediators, pseudoscalar mediators, colored mediators, and leptoquarks, are the most restrictive to date.Peer reviewe

MUSiC : a model-unspecific search for new physics in proton-proton collisions at root s=13TeV

Results of the Model Unspecific Search in CMS (MUSiC), using proton-proton collision data recorded at the LHC at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb(-1), are presented. The MUSiC analysis searches for anomalies that could be signatures of physics beyond the standard model. The analysis is based on the comparison of observed data with the standard model prediction, as determined from simulation, in several hundred final states and multiple kinematic distributions. Events containing at least one electron or muon are classified based on their final state topology, and an automated search algorithm surveys the observed data for deviations from the prediction. The sensitivity of the search is validated using multiple methods. No significant deviations from the predictions have been observed. For a wide range of final state topologies, agreement is found between the data and the standard model simulation. This analysis complements dedicated search analyses by significantly expanding the range of final states covered using a model independent approach with the largest data set to date to probe phase space regions beyond the reach of previous general searches.Peer reviewe

Measurement of prompt open-charm production cross sections in proton-proton collisions at root s=13 TeV

The production cross sections for prompt open-charm mesons in proton-proton collisions at a center-of-mass energy of 13TeV are reported. The measurement is performed using a data sample collected by the CMS experiment corresponding to an integrated luminosity of 29 nb(-1). The differential production cross sections of the D*(+/-), D-+/-, and D-0 ((D) over bar (0)) mesons are presented in ranges of transverse momentum and pseudorapidity 4 < p(T) < 100 GeV and vertical bar eta vertical bar < 2.1, respectively. The results are compared to several theoretical calculations and to previous measurements.Peer reviewe

Measurement of B-c(2S)(+) and B-c*(2S)(+) cross section ratios in proton-proton collisions at root s=13 TeV

Peer reviewe

Observation of tW production in the single-lepton channel in pp collisions at root s=13 TeV

A measurement of the cross section of the associated production of a single top quark and a W boson in final states with a muon or electron and jets in proton-proton collisions at root s = 13 TeV is presented. The data correspond to an integrated luminosity of 36 fb(-1) collected with the CMS detector at the CERN LHC in 2016. A boosted decision tree is used to separate the tW signal from the dominant t (t) over bar background, whilst the subleading W+jets and multijet backgrounds are constrained using data-based estimates. This result is the first observation of the tW process in final states containing a muon or electron and jets, with a significance exceeding 5 standard deviations. The cross section is determined to be 89 +/- 4 (stat) +/- 12 (syst) pb, consistent with the standard model.Peer reviewe

Probing effective field theory operators in the associated production of top quarks with a Z boson in multilepton final states at root s=13 TeV

Peer reviewe

Combined searches for the production of supersymmetric top quark partners in proton-proton collisions at root s=13 TeV

A combination of searches for top squark pair production using proton-proton collision data at a center-of-mass energy of 13 TeV at the CERN LHC, corresponding to an integrated luminosity of 137 fb(-1) collected by the CMS experiment, is presented. Signatures with at least 2 jets and large missing transverse momentum are categorized into events with 0, 1, or 2 leptons. New results for regions of parameter space where the kinematical properties of top squark pair production and top quark pair production are very similar are presented. Depending on themodel, the combined result excludes a top squarkmass up to 1325 GeV for amassless neutralino, and a neutralinomass up to 700 GeV for a top squarkmass of 1150 GeV. Top squarks with masses from 145 to 295 GeV, for neutralino masses from 0 to 100 GeV, with a mass difference between the top squark and the neutralino in a window of 30 GeV around the mass of the top quark, are excluded for the first time with CMS data. The results of theses searches are also interpreted in an alternative signal model of dark matter production via a spin-0 mediator in association with a top quark pair. Upper limits are set on the cross section for mediator particle masses of up to 420 GeV

Search for dark photons in Higgs boson production via vector boson fusion in proton-proton collisions at √s = 13 TeV

A search is presented for a Higgs boson that is produced via vector boson fusion and that decays to an undetected particle and an isolated photon. The search is performed by the CMS collaboration at the LHC, using a data set corresponding to an integrated luminosity of 130 fb−1, recorded at a center-of-mass energy of 13 TeV in 2016–2018. No significant excess of events above the expectation from the standard model background is found. The results are interpreted in the context of a theoretical model in which the undetected particle is a massless dark photon. An upper limit is set on the product of the cross section for production via vector boson fusion and the branching fraction for such a Higgs boson decay, as a function of the Higgs boson mass. For a Higgs boson mass of 125 GeV, assuming the standard model production rates, the observed (expected) 95% confidence level upper limit on the branching fraction is 3.5 (2.8)%. This is the first search for such decays in the vector boson fusion channel. Combination with a previous search for Higgs bosons produced in association with a Z boson results in an observed (expected) upper limit on the branching fraction of 2.9 (2.1)% at 95% confidence level