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Listar por palabra clave "Spectral analysis"

Mostrando ítems 1-20 de 21

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Advanced Rotor Fault Diagnosis for Medium-Voltage Induction Motors Via Continuous Transforms

Antonino-Daviu, J.; Pons Llinares, Joan; Lee, Sang Bin (Institute of Electrical and Electronics Engineers, 2016)

[EN] Anumber of field case studies for rotor fault diagnosis on medium-voltage induction motors operating in a petrochemical plant are presented in this paper. The methodology employed is based on analyzing the induction ...
Ajuste de señales usando Algoritmos Genéticos

Pérez Romero, Santiago (Universitat Politècnica de València, 2018-11-07)

Son innumerables los fenómenos que en diversas disciplinas (Física, Química, Biología, Electrónica, Telecomunicaciones) involucran la adquisición y análisis de una señal para la obtención de información del comportamiento ...
Analysis of atrial fibrillation recidivity under successive attempts of electrical cardioversion based on fibrillatory wave amplitude and dominant frequency

Alcaraz Martínez, Raúl; Rieta, J J; Hornero, Fernando (2013)

Atrial fibrillation (AF) is the most common cardiac arrhythmia in clinical practice. One frequent and very effective alternative to revert AF back to a normal sinus rhythm (NSR) is external electrical cardioversion (ECV). ...
Analysis of the spectral properties of variable-density turbulent reacting shear layers

Ortiz Tarín, José Luis (Universitat Politècnica de València, 2015-05-15)

Spectral analysis of turbulent uxes and new stresses that appear in the variable-density ltered Navier- Stokes equations has been carried out following an analogous procedure to the one used in traditional turbulence ...
Arrhythmia Mechanism and Scaling Effect on the Spectral Properties of Electroanatomical Maps with Manifold Harmonics

Sanroman-Junquera, Margarita; Mora-Jimenez, Inmaculada; Garcia-Alberola, Arcadio; Caamano, Antonio J.; Trénor Gomis, Beatriz Ana; Rojo-Alvarez, Jose L. (Institute of Electrical and Electronics Engineers, 2018)

[EN] Introduction: Spatial and temporal processing of intracardiac electrograms provides relevant information to support the arrhythmia ablation during electrophysio-logical studies. Current cardiac navigation systems (CNS) ...
Combination of frequency- and time-domain characteristics of the fibrillatory waves for enhanced prediction of persistent atrial fibrillation recurrence after catheter ablation

Escribano, Pilar; Ródenas, Juan; García, Manuel; Arias, Miguel A.; Hidalgo, Víctor M.; Calero, Sofía; Rieta, J J; Alcaraz, Raúl (Elsevier, 2024-02-15)

[EN] Catheter ablation (CA) remains the cornerstone alternative to cardioversion for sinus rhythm (SR) restoration in patients with atrial fibrillation (AF). Unfortunately, despite the last methodological and technological ...
Computational study on the non-reacting flow in Lean Direct Injection gas turbine combustors through Eulerian-Lagrangian Large-Eddy Simulations

Belmar Gil, Mario (Universitat Politècnica de València, 2021-01-21)

[ES] El principal desafío en los motores turbina de gas empleados en aviación reside en aumentar la eficiencia del ciclo termodinámico manteniendo las emisiones contaminantes por debajo de las rigurosas restricciones. Ésto ...
Desarrollo de un oído electrónico para la detección precoz de plagas en palmáceas mediante el tratamiento digital de audio

Montes Robles, Roberto (Universitat Politècnica de València, 2014-07-30)

[EN] This Master Thesis aims to study and design of an electronic system capable of detecting and identifying the sound produced by abdominal movement of red palm weevil pupae inside of the palms
Detection of adjacent and non-adjacent bar breakages in induction motors via convolutional analysis of sound signals

Iglesias Martínez, Miguel Enrique; Fernández de Córdoba, Pedro; Antonino Daviu, José Alfonso; Conejero, J. Alberto (MDPI AG, 2020-10)

[EN] We apply power spectral analysis based on covariance function and spectral subtraction to detect adjacent and non-adjacent bar breakages. We get a spectral pattern when the signal presents one or various broken bars, ...
Detection of nonadjacent rotor faults in induction motors via spectral subtraction and autocorrelation of stray flux signals

Iglesias-Martínez, Miguel Enrique; Fernández de Córdoba, Pedro; Antonino Daviu, José Alfonso; Conejero, J. Alberto (Institute of Electrical and Electronics Engineers, 2019-10)

[EN] In this paper, statistical signal processing techniques are applied to electromotive force signals captured in external coil sensors for adjacent and nonadjacent broken bars detection in induction motors. An algorithm ...
Dynamic Modeling and Stability Analysis of Stochastic Multi-Physical Systems Applied to Electric Power Systems

González Zumba, Jorge Andrés (Universitat Politècnica de València, 2021-01-10)

[ES] La naturaleza aleatoria que caracteriza algunos fenómenos en sistemas físicos reales (e.g., ingeniería, biología, economía, finanzas, epidemiología y otros) nos ha planteado el desafío de un cambio de paradigma del ...
Electrocardiographic Spectral Features for Long-Term Outcome Prognosis of Atrial Fibrillation Catheter Ablation

Alcaraz, Raúl; Hornero, Fernando; Rieta, J J (Springer Verlag (Germany), 2016-11)

Atrial fibrillation (AF) is the most common arrhythmia in routine clinical practice. Despite many years of research, its mechanisms still are not well understood, thus reducing the effectiveness of AF treatments. Nowadays, ...
Electrohysterography in the diagnosis of preterm birth: a review

Garcia-Casado, Javier; Ye Lin, Yiyao; Prats-Boluda, Gema; Mas-Cabo, Javier; Alberola Rubio, José; Perales Marin, Alfredo Jose (IOP Publishing, 2018)

[EN] Preterm birth (PTB) is one of the most common and serious complications in pregnancy. About 15 million preterm neonates are born every year, with ratios of 10-15% of total births. In industrialized countries, preterm ...
Fast Numerical Model of Power Busbar Conductors Through the FFT and the Convolution Theorem

Martinez-Roman, Javier; Puche-Panadero, Rubén; Sapena-Bano, Angel; Burriel-Valencia, Jordi; Terrón-Santiago, Carla; Pineda-Sanchez, Manuel; Riera-Guasp, Martín (Institute of Electrical and Electronics Engineers, 2022-08)

[EN] Skin and proximity effects can cause a non-uniform current distribution in the electrical conductors used in alternating current (ac) busbar systems, which increases resistance, decreases internal inductance, and ...
Flow distortion computational investigation in a serpentine diffuser

Gil Prieto, Daniel Edmundo (Universitat Politècnica de València, 2016-03-22)

Unmanned Aerial Vehicles are currently receiving great attention and interest by the air forces because they are able to operate in highly-threatened missions without risk to life and reduced through-life costs. The ...
Further results on generalized centro-invertible matrices

Lebtahi Ep-Kadi-Hahifi, Leila; Romero Martínez, José Oscar; Thome, Néstor (Springer-Verlag, 2018)

[EN] This paper deals with generalized centro-invertible matrices introduced by the authors in Lebtahi et al. (Appl. Math. Lett. 38, 106¿109, 2014). As a first result, we state the coordinability between the classes of ...
Low-Cost Diagnosis of Rotor Asymmetries of Induction Machines at Very Low Slip With the Goertzel Algorithm Applied to the Rectified Current

Martinez-Roman, Javier; Puche-Panadero, Rubén; Terron-Santiago, Carla; Sapena-Bano, Angel; Burriel-Valencia, Jordi; Pineda-Sanchez, Manuel (Institute of Electrical and Electronics Engineers, 2021)

[EN] Induction machines (IMs) are essential components of many industrial installations and, therefore, their faults must be detected early. Fault detection using current spectrum analysis is attracting an increasing ...
Machinery Failure Approach and Spectral Analysis to Study the Reaction Time Dynamics over Consecutive Visual Stimuli: An Entropy-Based Model

Iglesias-Martinez, Miguel E.; Hernaiz-Guijarro, Moises; Castro-Palacio, Juan Carlos; Fernández de Córdoba, Pedro; Isidro, J.M.; Navarro-Pardo, Esperanza (MDPI AG, 2020-11)

[EN] The reaction times of individuals over consecutive visual stimuli have been studied using an entropy-based model and a failure machinery approach. The used tools include the fast Fourier transform and a spectral entropy ...
Preoperative Prediction of Catheter Ablation Outcome in Persistent Atrial Fibrillation Patients through Spectral Organization Analysis of the Surface Fibrillatory Waves

Escribano Cano, Pilar; Ródenas, Juan; García, Manuel; Arias, Miguel A.; Hidalgo, Víctor M.; Calero, Sofía; Rieta, J J; Alcaraz, Raúl (MDPI AG, 2022-10)

[EN] Catheter ablation (CA) is a commonly used treatment for persistent atrial fibrillation (AF). Since its medium/long-term success rate remains limited, preoperative prediction of its outcome is gaining clinical interest ...
Role of the P-wave high frequency energy and duration as noninvasive cardiovascular predictors of paroxysmal atrial fibrillation

Alcaraz, Raúl; Martínez, Arturo; Rieta, J J (Elsevier, 2015-04)

[EN] A normal cardiac activation starts in the sinoatrial node and then spreads throughout the atrial myocardium, thus defining the P-wave of the electrocardiogram. However, when the onset of paroxysmal atrial fibrillation ...