Results 101 to 110 of about 2,823 (194)

A complex-valued convolutional fusion-type multi-stream spatiotemporal network for automatic modulation classification

Scientific Reports
Automatic Modulation Classification (AMC) is crucial in non-cooperative communication systems as it facilitates the identification of interference signals with minimal prior knowledge.
Yuying Wang, Shengliang Fang, Youchen Fan, Mengtao Wang, Zhaojing Xu, Shunhu Hou   +5 more
doaj   +1 more source

Low Complexity Parallel Carrier Frequency Offset Estimation Based on Time-Tagged QPSK Partitioning for Coherent Free-Space Optical Communication

Photonics
To effectively mitigate the effects of atmospheric turbulence in free space optical (FSO) communication, we propose a parallel carrier frequency offset estimation (FOE) scheme based on time-tagged QPSK partitioning (TTQP).
Siqi Zhang, Liqian Wang, Kunfeng Liu, Shuang Ding   +3 more
doaj   +1 more source

Improved subjective sleep quality in older adults by enhancing the GABAergic system in the sensorimotor cortex

The Journal of Physiology, Volume 604, Issue 15, Page 6506-6546, 1 August 2026.
Abstract figure legend Sleep disturbances are common in older adults, highlighting the need for accessible interventions to improve sleep quality. Eighteen older adults per group (balance training and control) were assessed before and after 12 weeks. The balance group increased GABA levels (magnetic resonance spectroscopy) and functional connectivity ...
Selin Scherrer, Sven Egger, Xinyu Liu, Anna Zoé Wick, Björn Rasch, Lijing Xin, Benedikt Lauber, Wolfgang Taube   +7 more
wiley   +1 more source

Neural‐Initialized Newton: Accelerating Nonlinear Finite Elements via Operator Learning

International Journal for Numerical Methods in Engineering, Volume 127, Issue 14, 30 July 2026.
ABSTRACT We propose a Newton‐based scheme, initialized by neural operator predictions, to accelerate the parametric solution of nonlinear problems in computational solid mechanics. First, a physics‐informed neural operator based on conditional neural fields or Fourier neural operators is trained to approximate the nonlinear parametric solution of the ...
Kianoosh Taghikhani, Yusuke Yamazaki, Jerry Paul Varghese, Markus Apel, Reza Najian Asl, Shahed Rezaei   +5 more
wiley   +1 more source

Performance Analysis of Generalized Quadrature Spatial Modulation with Quasi-Orthogonal Space-Time Block Codes Under Nakagami m-Fading Channels

Telecom
Spatial Modulation (SM) is a promising technique for future wireless communication systems, as it reduces hardware cost and complexity while maintaining good bit error rate (BER) performance in MIMO systems.
Sagarkumar Patel, Harishkumar B. Chaudhari, Dharmendra Chauhan, Hardik Modi, Hiren Mewada, Sagar Kavaiya   +5 more
doaj   +1 more source

Surface and Boundary Corrections in Peridynamics Using Optimized Nodal Influence Weights

International Journal for Numerical Methods in Engineering, Volume 127, Issue 14, 30 July 2026.
ABSTRACT Peridynamics (PD), similarly to some other nonlocal continuum theories, exhibits truncated interaction horizons near free surfaces, cracks, and voids in bounded domains. This loss of neighbors causes artificial surface effects and inconsistencies in the derivative and energy operators that persist under discretization refinement, limiting PD ...
Arman Shojaei, Greta Ongaro, Alexander Hermann, Stewart A. Silling, Patrizia Trovalusci, Christian J. Cyron   +5 more
wiley   +1 more source

Numerical Anisotropy and Band‐Gap Formation in Finite Element Wave Propagation: Analysis and Mitigation Using Spline‐Based Elements

International Journal for Numerical Methods in Engineering, Volume 127, Issue 14, 30 July 2026.
ABSTRACT Numerical anisotropy and dispersion are inherent consequences of spatial discretization in finite element modeling of wave propagation. In two‐dimensional problems, these effects manifest not only as direction‐dependent phase and group velocities but also as angularly dependent numerical band gaps that may entirely suppress wave propagation ...
Wiktor Waszkowiak, Arkadiusz Żak, Łukasz Doliński, Paweł Kowalski   +3 more
wiley   +1 more source

Application of time reversal technique in shallow water environment

Archives of Acoustics, 2014
Underwater acoustic communications in shallow water environment is a challenging problem due to the intersymbol interference caused by time-varying dispersive multipath channel.
Sławomir Jastrzębski
doaj  

Subseasonal Tropical Convection Characteristics in the Energy Exascale Earth System Model Version 2

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 14, 28 July 2026.
Abstract Accurate simulation of subseasonal tropical moist convection remains a key challenge for Earth system models. The difficulties stem from the reliance of cumulus cloud processes on model parameterizations and the need to represent the multiscale nature of interactions among clouds, radiation, moisture, circulation, and surface energy fluxes ...
James J. Benedict, Brandon Wolding, Walter M. Hannah, Charlotte A. DeMott   +3 more
wiley   +1 more source

Interannual Variability of Mean Winds and the Semidiurnal Tide in the Antarctic Summer Mesosphere‐Lower Thermosphere

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 14, 28 July 2026.
Abstract Long‐term observations at southern polar latitudes in the summertime mesosphere–lower thermosphere (MLT) reveal persistent nonmigrating semidiurnal tides, with the zonal wavenumber‐1 (s $s$ = 1) component being particularly dominant. Using nearly two decades of meteor radar wind measurements (80–100 km) from Davis Station (East Antarctica) and
R. A. Vincent, J.‐H. Kim, C. Lee, G. Jee, D. J. Murphy, I. M. Reid   +5 more
wiley   +1 more source