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349 results on '"Fernandez-Gamiz, Unai"'

6. On the monotonic properties and oscillatory behavior of solutions of neutral differential equations

Author

Masood Fahd, Moaaz Osama, Santra Shyam S., Fernandez-Gamiz Unai, and El-Metwally Hamdy

Subjects
neutral differential equations, oscillatory, even-order, non-canonical case, 34c10, 34k11, Mathematics, QA1-939
Abstract

In this work, we study new asymptotic properties of positive solutions of the even-order neutral differential equation with the noncanonical operator. The new properties are iterative, which means they can be used several times. We also use these properties to obtain new criteria for oscillation of the studied equation.

Published
2023
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14. Educational Innovation Project in the Field of Informatics

Author

Lopez-Guede, Jose Manuel, del Valle, Javier, Zulueta, Ekaitz, Fernandez-Gamiz, Unai, Ramos-Hernanz, Josean, Estevez, Julian, Graña, Manuel, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, García Bringas, Pablo, editor, Pérez García, Hilde, editor, Martínez de Pisón, Francisco Javier, editor, Martínez Álvarez, Francisco, editor, Troncoso Lora, Alicia, editor, Herrero, Álvaro, editor, Calvo Rolle, José Luis, editor, Quintián, Héctor, editor, and Corchado, Emilio, editor

Published
2023
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46. A Relative Positioning Development for an Autonomous Mobile Robot with a Linear Regression Technique

Author

Teso-Fz-Betoño, Daniel, Zulueta, Ekaitz, Sánchez-Chica, Ander, Fernandez-Gamiz, Unai, Uriarte, Irantzu, Lopez-Guede, Jose Manuel, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Herrero, Álvaro, editor, Cambra, Carlos, editor, Urda, Daniel, editor, Sedano, Javier, editor, Quintián, Héctor, editor, and Corchado, Emilio, editor

Published
2021
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48. CNN-based vane-type vortex generator modelling.

Author

Portal-Porras, Koldo, Fernandez-Gamiz, Unai, Zulueta, Ekaitz, Garcia-Fernandez, Roberto, and Uralde-Guine, Xabier

Subjects
*CONVOLUTIONAL neural networks, *COMPUTATIONAL fluid dynamics, *FLUID dynamics, *ARTIFICIAL intelligence, *VORTEX motion, *VORTEX generators
Abstract

The simplicity and accuracy of Computational Fluid Dynamics (CFD) tools have made them the most widely used method for solving fluid dynamics problems. However, these tools have some limitations, being the most significant the required computational resources. This fact, added to the growth of the Artificial Intelligence, has led to an increasing number of studies using data-driven methods to solve fluid dynamic problems. Flow control devices are a very popular research topic, since their implementation can significantly improve the behaviour of the flow. Among these devices, Vortex Generators (VGs) can be highlighted for their simplicity, efficiency and numerous applications. In this study, a Convolutional Neural Network (CNN) is proposed to predict the flow behaviour on the wake behind VGs. In order to obtain data for training the network, 20 different CFD simulations were conducted, considering the same inflow conditions but different vane heights and angles of attack of the VGs. The results show that the CNN is able to accurately predict the velocity and vorticity fields on the wake of the VG, being the most conflictive cases the ones with tall VGs, large angles of attack and close distances to the VGs. Additionally, the vortical structure, vortex path and velocity profiles on the vortex core of the main vortex are evaluated, showing good agreements with CFD results. [ABSTRACT FROM AUTHOR]

Published
2024
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49. Optimization of the Shunt Currents and Pressure Losses of a VRFB by Applying a Discrete PSO Algorithm.

Author

Ispas-Gil, Decebal Aitor, Zulueta, Ekaitz, Olarte, Javier, Zulueta, Asier, and Fernandez-Gamiz, Unai

Subjects
OPTIMIZATION algorithms, VANADIUM redox battery, HYDRAULIC models, ALGORITHMS, CEREBROSPINAL fluid shunts
Abstract

This paper presents an extensive study on the electrochemical, shunt currents, and hydraulic modeling of a vanadium redox flow battery of m stacks and n cells per stack. The shunt currents model of the battery has been developed through the use of Kirchoff's laws, taking into account the different design cases that can occur and enumerating the equations of nodes and meshes specifying them so that the software implementation can be performed in a direct way. The hydraulic model has been developed by numerical methods. These models are put to work simultaneously in order to simulate the behavior of a VRFB battery during charging and discharging, obtaining the pressure losses and shunt currents that occur in the battery. Using these models, and by using a PSO-type optimization algorithm, specifically designed for discrete variables, the battery design is optimized in order to minimize the round-trip efficiency losses due to pressure losses and shunt currents. In the optimization of the battery design, value is given to the number of stacks in which the total number of cells in the battery is distributed and the dimensions of the piping relative to both the stacks and the cells. [ABSTRACT FROM AUTHOR]

Published
2024
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50. Educational Project for the Inclusion of the Scientific Culture in the Bachelor’s Degrees

Author

Lopez-Guede, Jose Manuel, Fernandez-Gamiz, Unai, Boyano, Ana, Zulueta, Ekaitz, Tazo, Inmaculada, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Graña, Manuel, editor, López-Guede, José Manuel, editor, Etxaniz, Oier, editor, Herrero, Álvaro, editor, Sáez, José Antonio, editor, Quintián, Héctor, editor, and Corchado, Emilio, editor

Published
2019
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