Results 81 to 90 of about 4,267 (192)

IQ-Modulation Using Phase and Amplitude Modulators and Multimode Interference

Photonics
Optical amplitude and phase modulators are an integral part of modern optical communications systems. As optical data formats transitioned from encoding amplitude exclusively to both amplitude and phase, several different methods for creating the ...
Frank H. Peters
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

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

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

Three‐Dimensional Array Multicasting of Cylindrical Vector Beams Using Spin‐Multiplexed Dammann Vortex Metasurface

Nanophotonics, Volume 15, Issue 14, 27 July 2026.
This study demonstrates, for the first time, a 3D volumetric cylindrical vector beam (CVB) multicasting architecture that employs multichannel array modes with an operational dimension of 3 × 3 × 5 as information carriers. This approach offers substantial potential for high‐capacity information dissemination in mode‐multiplexed communication networks ...
Zhiqiang Xie, Qingji Zeng, Huihua Huang, Zhibin Wu, Kai Niu, Junmin Liu, Shuqing Chen, Dianyuan Fan, Dingyuan Tang   +8 more
wiley   +1 more source

Generalized Secure Superchannels: A Signal Encryption Framework

IEEE Access
In this work, we propose a comprehensive technique to enhance the security of superchannels (SCs). The spectral samples of the signals within a superchannel are shuffled and further encrypted in amplitude and phase, according to cryptographic keys.
Marcelo L. F. Abbade, Marcelo P. Nogueira, Luiz H. Bonani, Eric A. M. Fagotto, Plinio S. Dester, Wilian M. Dos Santos, Ivan Aldaya   +6 more
doaj   +1 more source

Modulation Classification for Overlapped Signals Using Deep Learning

IEEE Open Journal of the Communications Society
Modulation recognition (MR) plays a pivotal role in tasks encompassing spectrum management, security enforcement, and interference mitigation. This research work introduces a deep learning-based MR method tailored for completely overlapped multi-user (MU)
Gaurav Jajoo, Prem Singh
doaj   +1 more source