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  • Improving the prediction of the Madden-Julian Oscillation of the ECMWF model by post-processing 

    Silini, Riccardo; Lerch, Sebastian; Mastrantonas, Nikolaos; Kantz, Holger; Barreiro, Marcelo; Masoller Alonso, Cristina (2022-08-23)
    Article
    Open Access
    The Madden–Julian Oscillation (MJO) is a major source of predictability on the sub-seasonal (10 to 90 d) timescale. An improved forecast of the MJO may have important socioeconomic impacts due to the influence of MJO on ...

  • Binary image classification using collective optical modes of an array of nanolasers 

    Tirabassi, Giulio; Ji, Kaiwen; Masoller Alonso, Cristina; Yacomotti, Alejandro M. (2022-09)
    Article
    Open Access
    Recent advancements in nanolaser design and manufacturing open up unprecedented perspectives in terms of high integration densities and ultra-low power consumption, making these devices ideal for high-performance optical ...

  • Neuronal coupling benefits the encoding of weak periodic signals in symbolic spike patterns 

    Masoliver Vila, Maria; Masoller Alonso, Cristina (2020-03-01)
    Article
    Open Access
    The biophysical mechanisms by which an input signal elicits a neuronal response are well known (sufficiently large inputs change the membrane potential of the neuron and generate electrical pulses, known as action potentials ...

  • Inferring the connectivity of coupled chaotic oscillators using Kalman filtering 

    Forero Ortiz, Edwar Andres; Tirabassi, Giulio; Masoller Alonso, Cristina; Pons Rivero, Antonio Javier (Nature, 2021-11-17)
    Article
    Open Access
    Inferring the interactions between coupled oscillators is a significant open problem in complexity science, with multiple interdisciplinary applications. While the Kalman filter (KF) technique is a well-known tool, widely ...

  • Time crystal dynamics in a weakly modulated stochastic time delayed system 

    Tiana Alsina, Jordi; Masoller Alonso, Cristina (Nature, 2022-03-22)
    Article
    Open Access
    Time crystal oscillations in interacting, periodically driven many-particle systems are highly regular oscillations that persist for long periods of time, are robust to perturbations, and whose frequency difers from the ...

  • Nonlinear propagation effect in x-ray parametric amplification during high harmonic generation 

    Seres, Jozsef; Seres, Enikoe; Serrat Jurado, Carles; Dinh, Thanh Hung; Hasegawa, N.; Ishino, Masahiko; Nishikino, M.; Nakano, Kouji; Namba, Shinichi (2022-04-01)
    Article
    Restricted access - publisher's policy
    We report the realization and characterization of parametric amplification in high harmonic generation around 100 eV using He gas in a double gas jet arrangement. The delay of the seed extreme ultraviolet (XUV) pulse with ...

  • Nonlinear complexification of periodic orbits in the generalized Landau scenario 

    Herrero Simon, Ramon; Farjas Silva, Jordi; Pi Vila, Francesc; Orriols Tubella, Gaspar (2022-02)
    Article
    Open Access
    We have found a way for penetrating the space of the dynamical systems towards systems of arbitrary dimension exhibiting the nonlinear mixing of a large number of oscillation modes through which extraordinarily complex ...

  • Experimental and Numerical Study of Locking of Low-Frequency Fluctuations of a Semiconductor Laser with Optical Feedback 

    Tiana Alsina, Jordi; Masoller Alonso, Cristina (2022-02)
    Article
    Open Access
    We study the output of a semiconductor laser with optical feedback operated in the lowfrequency fluctuations (LFFs) regime and subject to weak sinusoidal current modulation. In the LFF regime, the laser intensity exhibits ...

  • Supercollimation of light beams by axisymmetric aperiodic photonic structures 

    Gailevicius, Darius; Aleksandravicius, Edvinas; Purlys, Vytautas; Staliunas, Kestutis (2021-12-14)
    Article
    Restricted access - publisher's policy
    Efficient beam supercollimation is proposed and shown experimentally by axisymmetric aperiodic photonic structures. The structure consists of equidistant layers of concentric refraction index rings, with the transverse ...

  • ENSO and SAM Influence on the Generation of Long Episodes of Rossby Wave Packets During Southern Hemisphere Summer 

    Pérez Fernández, Iago; Barreiro, Marcelo; Masoller Alonso, Cristina (2021-12-27)
    Article
    Open Access
    This study assesses the impact of low-frequency climate modes on Rossby Wave Packets (RWPs) during southern hemisphere summer. In particular, we focus on long-lived RWPs (lifespan above 8 days) and determine how El ...

  • Correlation lags give early warning signals of approaching bifurcations 

    Tirabassi, Giulio; Masoller Alonso, Cristina (2022-02-01)
    Article
    Open Access
    Identifying approaching bifurcations and regime transitions from observations is an important challenge in time series analysis with practical applications in many fields of science. Well-known indicators are the increase ...

  • Machine learning prediction of the Madden-Julian oscillation 

    Silini, Riccardo; Barreiro Parrillo, Marcelo; Masoller Alonso, Cristina (Springer Nature, 2021-11-25)
    Article
    Open Access
    The socioeconomic impact of weather extremes draws the attention of researchers to the development of novel methodologies to make more accurate weather predictions. The Madden–Julian oscillation (MJO) is the dominant mode ...

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