Results 31 to 40 of about 6,936 (267)

Phase Offset Tracking for Free Space Digital Coherent Optical Communication System

Applied Sciences, 2019
The coherent receiving method can improve the sensitivity of an optical signal receiver for free space optical communication system effectively. To implement coherent receiving, the phase offset between the local laser in the receiver and the received ...
Hongwei Li, Yongmei Huang, Qiang Wang, Dong He, Zhenming Peng, Qing Li   +5 more
doaj   +1 more source

Simulation and Analysis the Attenuation Effect of Atmospheric Layers on a Laser Beam Within the Visible Range

Ibn Al-Haitham Journal for Pure and Applied Sciences, 2023
: The power and the size of the final spot of the laser beam reaching the target are very important requirements in most of the laser applications and fields such as medical, military, and scientific, so studying laser propagation in the atmosphere is a ...
Thair Abdulkareem Khalil Al-Aish, Mohammed Kamal Saleh   +1 more
doaj   +1 more source

Multifractality via Stochasticity in Atmospheric Dynamics Description Validated through Remote Sensing Data

Mathematics, 2022
In the present paper, correlations between multifractality and stochasticity in atmospheric dynamics are investigated. Starting with two descriptions of atmospheric scenarios, one based on scale relativity theory and another based on stochastic theory ...
Dragos-Constantin Nica, Mirela Voiculescu, Daniel-Eduard Constantin, Manuela Gîrțu, Liliana Topliceanu, Decebal Vasincu, Iulian-Alin Roșu, Maricel Agop   +7 more
doaj   +1 more source

Prediction of Power Fluctuations of Gaussian Beams After Transmission Through Turbulent Atmosphere

Photonics
As laser beams propagate through free space, power fluctuation occurs due to atmospheric turbulence, which significantly increases the bit error rate of free-space optical communication. If the precise prediction of power fluctuations can be achieved, it
Zhihao Wan, Jiayi Zhu, Cheng Huang, Zhimin He, Jun Zeng, Fuchang Chen, Chaoqun Yu, Yan Li, Huanting Chen, Yongtao Zhang, Jixiong Pu, Huichuan Lin   +11 more
doaj   +1 more source

Effects of Asymmetry Atmospheric Eddies on Spreading and Wander of Bessel–Gaussian Beams in Anisotropic Turbulence

IEEE Photonics Journal, 2018
The effects of asymmetry atmospheric eddies on the beam spreading and wander of Bessel–Gaussian (BG) beams in anisotropic turbulence are studied. Results show that turbulence anisotropy leads to the declines in both beam spreading and wander of BG
Mingjian Cheng, Lixin Guo, Jiangting Li, Xu Yan, Ridong Sun, Yang You   +5 more
doaj   +1 more source

Object Recognition in Atmospheric Turbulence Scenes

2023 31st European Signal Processing Conference (EUSIPCO), 2023
The influence of atmospheric turbulence on acquired surveillance imagery poses significant challenges in image interpretation and scene analysis. Conventional approaches for target classification and tracking are less effective under such conditions. While deep-learning-based object detection methods have shown great success in normal conditions, they ...
Disen Hu, Nantheera Anantrasirichai
openaire   +3 more sources

Current Status and Challenges in Data Collection for Aerospace Coatings Deposited by Plasma Spraying

Advanced Engineering Materials, EarlyView.
An innovative approach has been integrated into the GRENAT project to optimize plasma spraying and coating performance. Raw materials are accelerated and melted in the plasma generated by torches, creating coatings. Monitoring sensors collect process data which are combined with ex situ characterization data.
Lila Randriamananjara, Vincent Rat, Quentin Dubreuil, Patrice Valorge, Simon Goutier, Alain Denoirjean, Olivier Messe, Céline Ruelle, Jean‐Philippe Poli   +8 more
wiley   +1 more source

A case analysis of turbulence characteristics and ozone perturbations over eastern China

Frontiers in Environmental Science, 2022
Our knowledge of the vertical variabilities in turbulence and ozone perturbation in the free atmosphere is severely limited because of the scarcity of high-resolution observation data.
Zilin Qin, Yang He, Xiaoran Zhao, Yutao Feng, Xin Yi   +4 more
doaj   +1 more source

Electrospun Wood‐Derived Biopolymers as Electrodes in Electrochemical Energy Storage Technologies

Advanced Functional Materials, EarlyView.
Electrospinning transforms wood‐derived cellulose and lignin into architecturally defined, binder‐free carbon electrodes with tuneable porosity and functionality. This review shows how fibre design enables decoupled charge and mass transport, enhancing performance across battery systems, while identifying key challenges in spinnability, scalability ...
Michael W. Thielke, Hattie R. Chisnall, Jesus Vazquez Chavez, Ana B. Jorge Sobrido   +3 more
wiley   +1 more source

Meniscus‐Guided Interfacial Ring‐by‐Ring Assembly for In Situ Fabrication of Tubular Hydrogels

Advanced Materials, EarlyView.
A tubular hydrogel fabrication method leveraging the meniscus effect at the oil‐water interface is presented. UV irradiation across the concave surface of the photocurable hydrogel precursor induces the formation of ring‐like hydrogel structures. Sequential ring‐by‐ring assembly within microchannels enables the construction of arteriole‐scale hydrogel ...
Yuki Kamiya, Yingzhe Wang, Keisuke Morishima   +2 more
wiley   +1 more source