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  • Uncovering temporal regularity in atmospheric dynamics through Hilbert phase analysis 

    Zappalà, Dario A.; Barreiro Parrillo, Marcelo; Masoller Alonso, Cristina (Institute of Physics (IOP), 2019-05-03)
    Article
    Open Access
    Uncovering meaningful regularities in complex oscillatory signals is a challenging problem with applications across a wide range of disciplines.Here, we present a novel approach, based on the Hilbert transform (HT).We show ...

  • Topological data analysis of high resolution diabetic retinopathy images 

    Garside, Kathryn; Henderson, Robin; Makarenko, Irina; Masoller Alonso, Cristina (Public Library of Science (PLOS), 2019-05-24)
    Article
    Open Access
    Diabetic retinopathy is a complication of diabetes that produces changes in the blood vessel structure in the retina, which can cause severe vision problems and even blindness. In this paper, we demonstrate that by identifying ...

  • Fully Noncontact Hybrid NDT for 3D Defect Reconstruction Using SAFT Algorithm and 2D Apodization Window 

    Mohamed Selim, Hossameldin; Trull Silvestre, José Francisco; Delgado Prieto, Miquel; Pico Vila, Rubén; Romeral Martínez, José Luis; Cojocaru, Crina (Multidisciplinary Digital Publishing Institute (MDPI), 2019-05-08)
    Article
    Open Access
    Nondestructive testing of metallic objects that may contain embedded defects of different sizes is an important application in many industrial branches for quality control. Most of these techniques allow defect detection ...

  • Assessing diversity in multiplex networks 

    Carpi, Laura C.; Schieber, Tiabo A.; Pardalos, Panos M.; Marfany Nadal, Gemma; Masoller Alonso, Cristina; Díaz Guilera, Albert; Ravetti, Martin G. (Nature, 2019-03-14)
    Article
    Open Access
    Diversity, understood as the variety of different elements or configurations that an extensive system has, is a crucial property that allows maintaining the system’s functionality in a changing environment, where failures, ...

  • Speckle reduction in double-pass retinal images 

    Halpaap Halpaap, Herbert Donatus; García Guerra, Carlos Enrique; Vilaseca Ricart, Meritxell; Masoller Alonso, Cristina (Nature, 2019-03-14)
    Article
    Open Access

  • All-solid-state VUV frequency comb at 160 nm using high-harmonic generation in nonlinear femtosecond enhancement cavity 

    Seres, Jozsef; Seres, Enikoe; Serrat Jurado, Carles; Young, E. C.; Speck, J.S.; Schumm, T. (2019-02-21)
    Article
    Open Access
    We realized a solid-state-based vacuum ultraviolet frequency comb by harmonics generation in an external enhancement cavity. Optical conversions were so far reported by only using gaseous media. We present a theory that ...

  • Quantifying the degree of locking in weakly forced stochastic systems 

    Tiana Alsina, Jordi; Quintero Quiroz, Carlos Alberto; Torrent Serra, Maria del Carmen; Masoller Alonso, Cristina (American Institute of Physics (AIP), 2019-02-12)
    Article
    Open Access
    Controlling an stochastic nonlinear system with a small amplitude signal is a fundamental problem with many practical applications. Quantifying locking is challenging, and current methods, such as spectral or correlation ...

  • Unsupervised feature extraction of anterior chamber OCT images for ordering and classification 

    Amil Marletti, Pablo; González, Laura; Arrondo Murillo, Elena; Salinas Almela, Cecilia; Güell, José Luis; Masoller Alonso, Cristina; Parlitz, Ulrich (Nature, 2019-02-04)
    Article
    Open Access
    We propose an image processing method for ordering anterior chamber optical coherence tomography (OCT) images in a fully unsupervised manner. The method consists of three steps: Firstly we preprocess the images (filtering ...

  • Laser Ultrasound Inspection Based on Wavelet Transform and Data Clustering for Defect Estimation in Metallic Samples 

    Mohamed Selim, Hossameldin; Delgado Prieto, Miquel; Trull Silvestre, José Francisco; Romeral Martínez, José Luis; Cojocaru, Crina (Multidisciplinary Digital Publishing Institute (MDPI), 2019-01-30)
    Article
    Open Access
    Laser-generated ultrasound is a modern non-destructive testing technique. It has been investigated over recent years as an alternative to classical ultrasonic methods, mainly in industrial maintenance and quality control ...

  • Impact of lag information on network inference 

    Rubido, Nicolás; Masoller Alonso, Cristina (Springer, 2018-11-01)
    Article
    Restricted access - publisher's policy
    Extracting useful information from data is a fundamental challenge across disciplines as diverse as climate, neuroscience, genetics, and ecology. In the era of “big data,” data is ubiquitous, but appropriate methods are ...

  • Random delays and the synchronization of chaotic maps 

    Masoller Alonso, Cristina; Marti, Arturo C (American Institute of Physics (AIP), 2005-04)
    Article
    Restricted access - publisher's policy
    We investigate the dynamics of an array of chaotic logistic maps coupled with random delay times. We report that for adequate coupling strength the array is able to synchronize, in spite of the random delays. Specifically, ...

  • Directional invisibility by genetic optimization 

    Bor, Emre; Babayigit, Ceren; Kurt, H.; Staliunas, Kestutis; Turduev, M. (2018-11-26)
    Article
    Open Access
    In this Letter, the design of a directional optical cloaking by a genetic algorithm is proposed and realized experimentally. A three-dimensional finite-difference time-domain method is combined with the genetic optimization ...

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