Results 21 to 30 of about 1,141 (94)

On the Electromagnetic Energy Flow Along Geodesics

Radio Science, Volume 61, Issue 1, January 2026.
Abstract We present a field‐theoretic framework for modeling electromagnetic energy propagation in heterogeneous media by introducing the concept of electromagnetic geodesics. Unlike traditional ray optics, which assumes either a straight‐line propagation or a simple bending in refractive media, our approach formulates wave propagation as geodetic ...
Jacob T. Fokkema, Peter M. van den Berg
wiley   +1 more source

A Multiagent Deep Reinforcement Learning Scheme for Energy Use Optimization in UAV‐Enabled Wireless Networks With Reconfigurable Intelligent Surfaces

International Journal of Intelligent Systems, Volume 2026, Issue 1, 2026.
This work introduces a multiagent deep reinforcement learning (MADRL) framework for energy harvesting (EH) in unmanned aerial vehicle (UAV) networks aided by reconfigurable intelligent surfaces (RIS). The core goal is to maximize quantities of harvested energy subject to quality of service (QoS) constraints in dynamic wireless setups.
Syed Mohsin Bokhari, Muhammad Shafi, Sarmad Sohaib, Sanad Al Maskari, Muhammad Ahsan Iftikhar, Kallol Mohanta   +5 more
wiley   +1 more source

An Interval‐Valued Fermatean Neutrosophic Framework for Sustainable Transportation Under Uncertainty

Journal of Mathematics, Volume 2026, Issue 1, 2026.
Transportation planning is facing heightened complexity because the dynamic parameters influenced by globalization and unpredictable technological disruptions. Traditional models are not capable to handle interval‐based uncertainties related to supply, demand, and costs, especially as the scale of suppliers and customers expands.
Muhammad Kamran, Muhammad Nadeem, Magda Abd El-Rahman, J. Akhter, Ghous Ali   +4 more
wiley   +1 more source

Metasurfaces in Adaptive Optics: A New Opportunity in Optical Wavefront Sensing

Laser &Photonics Reviews, Volume 19, Issue 24, December 17, 2025.
Wavefront sensing constitutes a critical component of adaptive optics systems, aimed at quantitatively measuring distorted wavefronts and enabling closed‐loop correction in optical setups. Metasurfaces, as planar optical elements composed of nanoscale structures, provide exceptional freedom in modulating multiple dimensions of the light field.
Rundong Fan, Zichao Wang, Pei Li, Lei Huang   +3 more
wiley   +1 more source

Retrieving the propagation velocity of electromagnetic waves in a two‐layered medium through diffraction curves

Near Surface Geophysics, Volume 23, Issue 6, Page 585-597, December 2025.
Abstract This paper addresses the problem of retrieving the propagation velocities of electromagnetic waves in a non‐homogeneous soil made up of two layers separated by a not‐flat interface. The propagation velocities are estimated from GPR data gathered at the air–soil interface in common offset configuration.
Raffaele Persico, Ding Yang, Gianfranco Morelli, Luigi Capozzoli, Gregory De Martino, Ilaria Catapano, Giuseppe Esposito   +6 more
wiley   +1 more source

Mixability of Finite Groups

Random Structures &Algorithms, Volume 67, Issue 4, December 2025.
ABSTRACT A finite group G$$ G $$ is mixable if a product of random elements, each chosen independently from two options, can distribute uniformly on G$$ G $$. We present conditions and obstructions to mixability. We show that 2‐groups, the symmetric groups, the simple alternating groups, several matrix and sporadic simple groups, and most finite ...
Gideon Amir, Guy Blachar, Subhajit Ghosh, Uzi Vishne   +3 more
wiley   +1 more source

On the generalized Snell–Descartes laws, shock waves, water wakes, and Cherenkov radiation

Nanophotonics, Volume 14, Issue 23, Page 3897-3909, 02 November 2025.
Abstract The modification of light's trajectory after refracting through a boundary separating two media is a ubiquitous phenomenon in nature. The laws governing such refraction/reflection, known today as the Snell–Descartes laws of reflection and refraction, were established over four centuries ago and have since become foundational to the field of ...
Patrice Genevet, Nate Wright, Jayden Johnson, Aloke Jana, Emil Marinov, Loubnan Abou‐Hamdan   +5 more
wiley   +1 more source

Ultraviolet–Visible Spin‐Resolved Chip‐Scale Spectroscopy

Advanced Functional Materials, Volume 35, Issue 46, November 12, 2025.
By harnessing phase, wavelength, and spin multiplexing, the proposed meta‐spectrometer enables spin‐resolved spectral analysis within a compact footprint. The presented dual‐band (320–450 nm) spin‐resolved meta‐spectrometer features enhance optical functionality, allowing for the simultaneous discrimination of spectral content and spin states of light ...
Nasir Mahmood, Yujin Park, Naureen Butt, Joohoon Kim, Dongliang Gao, Muhammad Zubair, Tauseef Tauqeer, Lei Gao, Muhammad Qasim Mehmood, Junsuk Rho   +9 more
wiley   +1 more source

Propagation of sound through a sheared flow [PDF]

Sound generated in a moving fluid must propagate through a shear layer in order to be measured by a fixed instrument. These propagation effects were evaluated for noise sources typically associated with single and co-flowing subsonic jets and for ...
Karamcheti, K., Smith, C. A., Woolley, J. P.   +2 more
core   +1 more source

A novel blind signature scheme and its variations based on DLP [PDF]

, 2012
Blind Signature is an addendum of Digital Signature.It is a two party protocol,in which a requester sends a message to a signer to get the signature without revealing the contents of the message to the signer.
Sukhadarshini, Shubhanwita
core