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AWE Resources over Spain: Potential Added Value with Respect to Conventional Renewables

Gaertner, Miguel Angel (author), López-Franca, Noelia (author), Molina, María Ofelia (author), Gallardo, Clemente (author), Sánchez, Enrique (author), Ortega, María (author), Gutiérrez, Claudia (author)

conference paper 2024

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Autonomous Sensor System for Low-Capacity Wind Turbine Blade Vibration Measurement

Muxica, Diego (author), Rivera, Sebastian (author), Orchard, Marcos E. (author), Ahumada, Constanza (author), Jaramillo, Francisco (author), Bravo, Felipe (author), Gutiérrez, José M. (author), Astroza, Rodrigo (author)

This paper presents the design, implementation, and validation of an on-blade sensor system for remote vibration measurement for low-capacity wind turbines. The autonomous sensor system was deployed on three wind turbines, with one of them operating in harsh weather conditions in the far south of Chile. The system recorded the acceleration...

journal article 2024

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Delay Threshold for Social Interaction in Volumetric eXtended Reality Communication

Cortés, Carlos (author), Viola, Irene (author), Gutiérrez, Jesús (author), Jansen, Jack (author), Subramanyam, S. (author), Alexiou, Evangelos (author), Pérez, Pablo (author), García, Narciso (author), Cesar, Pablo (author)

Immersive technologies like eXtended Reality (XR) are the next step in videoconferencing. In this context, understanding the effect of delay on communication is crucial. This article presents the first study on the impact of delay on collaborative tasks using a realistic Social XR system. Specifically, we design an experiment and evaluate the...

journal article 2024

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On the extension of k−ω−SST corrections to predict flow separation on thick airfoils with leading-edge roughness

Gutiérrez, R. (author), Zamponi, R. (author), Ragni, D. (author), Llorente, Elena (author), Aranguren, Patricia (author)

Modern wind turbines employ thick airfoils in the outer region of the blade with strong adverse pressure gradients and high sensitivity to flow separation, which can be anticipated by leading-edge roughness. However, Reynolds average Navier-Stokes simulations currently overpredict the Reynolds shear stresses near the surface, and the flow...

journal article 2023

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Characterization of a Medium Mn-Ni Steel Q&P Treated by a High Partitioning Temperature Cycle

Arribas, Maribel (author), Del Molino, Eider (author), Gutiérrez, Teresa (author), Arlazarov, Artem (author), Martin, David (author), De Caro, Daniele (author), Ayenampudi, S. (author), Santofimia, Maria Jesus (author)

In this work, a medium Mn-Ni steel was treated through Quenching and Partitioning (Q&P) with a partitioning temperature (PT) of 650 °C, which corresponded to the start of the austenite reverse transformation (ART) phenomenon. The influence of the quenching temperature (QT) and partitioning time (Pt) on austenite stabilization and mechanical...

journal article 2022

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Study on k-ω-Shear Stress Transport Corrections Applied to Airfoil Leading-Edge Roughness Under RANS Framework

Gutiérrez, R. (author), Llorente, E. (author), Ragni, D. (author), Aranguren, P. (author)

A computational fluid dynamics study is carried out to model the effects of distributed roughness at the airfoil leading-edge using the equivalent sand grain approach and Reynolds-averaged Navier–Stokes equations. The turbulence model k - ω-shear stress transport (SST) is selected to emulate a fully turbulent flow. Three k and ω boundary...

journal article 2022

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Induced stalled flow due to roughness sensitivity for thick airfoils in modern wind turbines

Gutiérrez, R. (author), Llorente, E. (author), Ragni, D. (author)

The mid-span region of wind turbine blades can be thickened to fulfil the structural requirements of the blade. Hence, thick airfoils, that were designed to operate at the root region of the blade, are moved to the mid-span region. This could not imply remarkable variations of the blade performance once its surface is smooth. However, the...

journal article 2022

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Wind tunnel tests for vortex generators mitigating leading-edge roughness on a 30% thick airfoil

Gutiérrez, R. (author), Llórente, E. (author), Echeverría, F. (author), Ragni, D. (author)

In this study, the aerodynamic performance of a thick airfoil is analysed, after installing leading-edge roughness to emulate a severe state on the airfoil surface. The impact on aerodynamic coefficients has been quantified using two roughness methods: zig-zag tape and sandpaper. Wind tunnel tests are carried out at a Reynolds number of 3•10...

journal article 2020

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Austenite Reverse Transformation in a Q&P Route of Mn and Ni Added Steels

Arribas, Maribel (author), Gutiérrez, Teresa (author), Del Molino, Eider (author), Arlazarov, Artem (author), De Diego-Calderón, Irene (author), Martin, David (author), De Caro, Daniele (author), Ayenampudi, S. (author), Santofimia, Maria Jesus (author)

In this work, four low carbon steels with different contents of Mn and Ni were heat treated by quenching and partitioning (Q&P) cycles where high partitioning temperatures, in the range of 550 °C–650 °C, were applied. In order to elucidate the effect of applying these high partitioning temperatures with respect to more common Q&P cycles,...

journal article 2020

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Can effective pedagogy be ensured in minimally invasive surgery e-learning?

Oropesa, Ignacio (author), Gutiérrez, David (author), Chmarra, M.K. (author), Sánchez-Peralta, Luisa F. (author), Våpenstad, Cecilie (author), Sánchez-González, Patricia (author), Pagador, José B. (author), González-Segura, Ana (author), Langø, Thomas (author), Sánchez-Margallo, Francisco M. (author), Dankelman, J. (author), Gómez, Enrique J. (author)

Introduction: Effectiveness of e-learning diminishes without the support of a pedagogical model to guide its use. In minimally invasive surgery (MIS), this has been reported as a limitation when technology is used to deliver contents without a sound pedagogical background. Material and methods: We describe how a generic pedagogical model, the...

journal article 2020

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Importance of Methane Chemical Potential for Its Conversion to Methanol on Cu-Exchanged Mordenite

Zheng, Jian (author), Lee, Insu (author), Khramenkova, E. (author), Wang, Meng (author), Peng, B. (author), Gutiérrez, Oliver Y. (author), Fulton, John L. (author), Camaioni, Donald M. (author), Pidko, E.A. (author)

Copper-oxo clusters exchanged in zeolite mordenite are active in the stoichiometric conversion of methane to methanol at low temperatures. Here, we show an unprecedented methanol yield per Cu of 0.6, with a 90–95 % selectivity, on a MOR solely containing [Cu₃(μ-O)₃]²⁺ active sites. DFT calculations,...

journal article 2020

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Natural recovery of infiltration capacity in simulated bank filtration of highly turbid waters

Gutiérrez, Juan Pablo (author), van Halem, D. (author), Uijttewaal, W.S.J. (author), del Risco, Efraín (author), Rietveld, L.C. (author)

As a consequence of the suspended sediments in river water, cake formation on the streambed and clogging of the aquifer may occur, leading to a decline in the production yield of riverbank filtration systems, particularly in highly turbid river waters. However, naturally occurring flow forces may induce sufficient scouring of the streambed,...

journal article 2018

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Riverbank filtration in highly turbid rivers

Gutiérrez, Juan Pablo (author)

Riverbank filtration (RBF) is a surface water filtration method for drinking water through the banks and bed of a river, using extraction wells located near the water body in order to ensure direct aquifer recharge. As the surface water travels through the sediments, contaminants, such as suspended and colloidal solids and pathogenic...

doctoral thesis 2018

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Robust organic radical molecular junctions using acetylene terminated groups for c-au bond formation

Bejarano, Francesc (author), Olavarria Contreras, I.J. (author), Droghetti, Andrea (author), Rungger, Ivan (author), Rudnev, Alexander (author), Gutiérrez, Diego (author), Mas-Torrent, Marta (author), Veciana, Jaume (author), van der Zant, H.S.J. (author), Burzuri Linares, E. (author)

Organic paramagnetic and electroactive molecules are attracting interest as core components of molecular electronic and spintronic devices. Currently, further progress is hindered by the modest stability and reproducibility of the molecule/electrode contact. We report the synthesis of a persistent organic radical bearing one and two terminal...

journal article 2018

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Oxidoreductases on their way to industrial biotransformations

Martínez, Angel T. (author), Ruiz-Dueñas, Francisco J. (author), Camarero, Susana (author), Serrano, Ana (author), Linde, Dolores (author), Lund, Henrik (author), Vind, Jesper (author), Tovborg, Morten (author), Herold-Majumdar, Owik M. (author), Hofrichter, Martin (author), Liers, Christiane (author), Ullrich, René (author), Scheibner, Katrin (author), Sannia, Giovanni (author), Piscitelli, Alessandra (author), Pezzella, Cinzia (author), Sener, Mehmet E. (author), Kılıç, Sibel (author), van Berkel, Willem J.H. (author), Guallar, Victor (author), Lucas, Maria Fátima (author), Zuhse, Ralf (author), Ludwig, Roland (author), Hollmann, F. (author), Fernandez Fueyo, E. (author), Record, Eric (author), Faulds, Craig B. (author), Tortajada, Marta (author), Winckelmann, Ib (author), Rasmussen, Jo Anne (author), Gelo-Pujic, Mirjana (author), Gutiérrez, Ana (author), del Río, José C. (author), Rencoret, Jorge (author), Alcalde, Miguel (author)

Fungi produce heme-containing peroxidases and peroxygenases, flavin-containing oxidases and dehydrogenases, and different copper-containing oxidoreductases involved in the biodegradation of lignin and other recalcitrant compounds. Heme peroxidases comprise the classical ligninolytic peroxidases and the new dye-decolorizing peroxidases, while...

review 2017

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Riverbank filtration for the treatment of highly turbid Colombian rivers

Gutiérrez, Juan Pablo (author), van Halem, D. (author), Rietveld, L.C. (author)

The poor quality of many Colombian surface waters forces us to seek alternative, sustainable treatment solutions with the ability to manage peak pollution events and to guarantee the uninterrupted provision of safe drinking water to the population. This review assesses the potential of using riverbank filtration (RBF) for the highly turbid...

journal article 2017

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Multi-criteria analysis applied to the selection of drinking water sources in developing countries: A case study of Cali, Colombia

Gutiérrez, Juan Pablo (author), Delgado, Luis Germán (author), van Halem, D. (author), Wessels, Peter (author), Rietveld, L.C. (author)

Guaranteeing a safe and continuous drinking water supply for the city of Cali, Colombia, has become a concern for the water company of Cali, the environmental authorities, universities, and entities involved in the water resource. The progressive deterioration of the city’s water sources has led to a search for future water sources and/or...

journal article 2016

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Particulate matter characterization of Cauca River water in Colombia

Gutiérrez, Juan Pablo (author), van Halem, D. (author), Rietveld, L.C. (author)

The particulate matter composition in the Upper Cauca River section was studied, considering the importance of this river for the water supply of Cali, Colombia, and the implications that the turbidity of this water source has had for the city's water treatment. Additionally, the upstream Palo River was investigated, as this river is a major...

journal article 2016

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Overview of a range of solution methods for elastic dislocation problems in geophysics

Van Zwieten, G.J. (author), Hanssen, R.F. (author), Gutiérrez, M.A. (author)

Tectonic faults are commonly modeled as Volterra or Somigliana dislocations in an elastic medium. Over the years, many practical solutionmethods have been developed for problems of this type. This work presents a concise overview in consistent mathematical notation of the most prominent of these methods, emphasizing what the various methods have...

journal article 2013

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Effects of intima stiffness and plaque morphology on peak cap stress

Akyildiz, A.C. (author), Speelman, L. (author), Van Brummelen, H. (author), Gutiérrez, M.A. (author), Virmani, R. (author), Van der Lugt, A. (author), Van der Steen, A.F.W. (author), Wentzel, J.J. (author), Gijsen, F.J.H. (author)

Background: Rupture of the cap of a vulnerable plaque present in a coronary vessel may cause myocardial infarction and death. Cap rupture occurs when the peak cap stress exceeds the cap strength. The mechanical stress within a cap depends on the plaque morphology and the material characteristics of the plaque components. A parametric study was...

journal article 2011