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Neuronal coupling benefits the encoding of weak periodic signals in symbolic spike patterns
(2020-03-01)
Article
Open AccessThe 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
(Nature, 2021-11-17)
Article
Open AccessInferring 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
(Nature, 2022-03-22)
Article
Open AccessTime 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
(2022-04-01)
Article
Restricted access - publisher's policyWe 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
(2022-02)
Article
Open AccessWe 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
(2022-02)
Article
Open AccessWe 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
(2021-12-14)
Article
Restricted access - publisher's policyEfficient 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
(2021-12-27)
Article
Restricted access - publisher's policyThis 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
(2022-02-01)
Article
Open AccessIdentifying 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
(Springer Nature, 2021-11-25)
Article
Open AccessThe 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 ... -
Resonantly enhanced difference-frequency generation in the core X-ray absorption of molecules
(American Chemical Society, 2021-01-01)
Article
Open AccessWe use real-time time-dependent density functional theory simulations to numerically demonstrate that resonantly enhanced differencefrequency generation (re-DFG) involving intense ultrashort coherent X-ray pulses can ... -
Flat focusing in reflection from a chirped dielectric mirror with a defect layer
(2015-03-04)
Article
Open AccessRecently, the principle of flat focusing based on one-dimensionally chirped dielectric mirrors has been proposed and experimentally demonstrated. The flat chirped mirror causes anomalous diffraction of the beam during ...
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