Results 121 to 130 of about 17,710,470 (300)

All-optical mode conversion via spatially multimode four-wave mixing

open access: yesNew Journal of Physics, 2016
We experimentally demonstrate the conversion of a Gaussian beam to an approximate Bessel–Gauss mode by making use of a non-collinear four-wave mixing (4WM) process in hot atomic vapor.
Onur Danaci   +2 more
doaj   +1 more source

Digital Twin‐Based Optimization of Service Availability in LEO Mega Constellations Considering Handover Delays in Open RAN

open access: yesInternational Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT As non‐terrestrial networks (NTNs) become integral to future 6G systems, ensuring seamless connectivity and service continuity over low Earth orbit (LEO) satellite constellations is essential. This work investigates the impact of open radio access network (RAN) functional splits on handover performance in NTNs, focusing on minimizing service ...
Siva Satya Sri Ganesh Seeram   +3 more
wiley   +1 more source

New Stability Criteria for Event-Triggered Nonlinear Networked Control System with Time Delay

open access: yesComplexity, 2019
This note focuses on the stability and stabilization problem of nonlinear networked control system with time delay. To alleviate the burden of transformation channel and shorten the dynamic process simultaneously, an improved event-triggered scheme is ...
Hongqian Lu   +3 more
doaj   +1 more source

Navigating Gravity: Competing Effects Result in Opposing Taxis for Different Janus Swimmers

open access: yesSmall, EarlyView.
The combined effects of gravity and wall‐induced hydrodynamics on the motion of Janus colloids are investigated. Platinum‐ and copper‐coated silica microswimmers show distinct gravitactic alignment near surfaces due to different hydrodynamic couplings. This distinct gravitactic behavior enables separation of initially mixed active particles.
Amir Sheikh Shoaei   +2 more
wiley   +1 more source

Collimating three-axicon zoom system for interferometric Bessel beam side lobe cancellation

open access: yesOptical and quantum electronics
Optical Bessel beams are used in numerous applications like fluorescence microscopy, material processing and optical trapping. These applications require Bessel beams having a central core with defined full width at half maximum and a defined axial ...
M. Schnieder   +3 more
semanticscholar   +1 more source

Nanopore Trap for Label‐Free Fingerprinting of Surface‐modified Single Nanoparticles

open access: yesSmall Methods, EarlyView.
A solid‐state nanopore trapping‐based methodology combines “trap‐release” measurement protocol with multiple features extracted from ionic current of trapping events to generate unique electrical fingerprints of nanoparticles with distinct surface functional layers.
Nianduo Cai   +4 more
wiley   +1 more source

First hitting time for Bessel processes

open access: yesProceedings of the Japan Academy, Series A, Mathematical Sciences, 1985
The author computes by means of the standard and extended Dynkin formulas the first and second moments of the first hitting time of level r of the Bessel process of index \(\alpha (\alpha >0)\).
openaire   +3 more sources

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