Results 21 to 30 of about 601 (266)

Astronomy, Atmospheres and Refraction: Foreword

Comptes Rendus. Physique, 2023
International ...
Dettwiller, Luc, Léna, Pierre, Gratias, Denis   +2 more
openaire   +3 more sources

Real-Time Duct Prediction and Propagation Analysis Using Genetic Algorithm-Based RFC and Parabolic Equation Method

IEEE Access
This paper proposes a real-time prediction of the duct using a refractivity from clutter (RFC) method based on genetic algorithm (GA) and the parabolic equation (PE) method.
Jun Heo, Doyoung Jang, Hosung Choo, Dong-Yeop Na, Yong Bae Park   +4 more
doaj   +1 more source

Atmospheric refractivity estimation from AIS signal power using the quantum-behaved particle swarm optimization algorithm

Open Geosciences, 2019
This paper proposes a new refractivity profile estimation method based on the use of AIS signal power and quantum-behaved particle swarm optimization (QPSO) algorithm to solve the inverse problem.
Tang Wenlong, Cha Hao, Wei Min, Tian Bin, Ren Xichuang   +4 more
doaj   +1 more source

A modified artificial neural network based prediction technique for tropospheric radio refractivity. [PDF]

PLoS ONE, 2018
Radio refractivity plays a significant role in the development and design of radio systems for attaining the best level of performance. Refractivity in the troposphere is one of the features affecting electromagnetic waves, and hence the communication ...
Shumaila Javeed, Khurram Saleem Alimgeer, Wajahat Javed, M Atif, Mueen Uddin   +4 more
doaj   +1 more source

Investigation of Point Refractivity Gradient and Geoclimatic Factor at 70 m Altitude in Yenagoa, Nigeria

Journal of Nigerian Society of Physical Sciences, 2023
The quality of services provided via Inter-Terrestrial radio communication links such as GSM networks, Wide Area Network (WAN), Radio and TV broadcasts is largely influenced by some meteorological parameters such as temperature, pressure and humidity ...
Y. B. Lawal, E. T. Omotoso
doaj   +1 more source

Modulating Two‐Photon Absorption in a Pyrene‐Based MOF Series: An In‐Depth Investigation of Structure–Property Relationships

Advanced Functional Materials, EarlyView.
This study investigates H4TBAPy‐based metal–organic frameworks (MOFs) ‐ NU‐1000, NU‐901, SrTBAPy, and BaTBAPy ‐ for multiphoton absorption (MPA) performance. It observes topology‐dependent variations in the 2PA cross‐section, with BaTBAPy exhibiting the highest activity.
Simon N. Deger, Helmy Pacheco Hernandez, Yang Cui, Hongxing Hao, Vanessa Ramm, David C. Mayer, Khai‐Nghi Truong, Roland A. Fischer, Jürgen Hauer, Mariana Kozlowska, Alexander Pöthig   +10 more
wiley   +1 more source

Empirical analysis and modeling of errors of atmospheric profiles from GPS radio occultation [PDF]

Atmospheric Measurement Techniques, 2011
The utilization of radio occultation (RO) data in atmospheric studies requires precise knowledge of error characteristics. We present results of an empirical error analysis of GPS RO bending angle, refractivity, dry pressure, dry geopotential height, and
U. Foelsche, Y.-H. Kuo, G. Kirchengast, A. K. Steiner, B. Scherllin-Pirscher   +4 more
doaj   +1 more source

Electroactive Metal–Organic Frameworks for Electrocatalysis

Advanced Functional Materials, EarlyView.
Electrocatalysis is crucial in sustainable energy conversion as it enables efficient chemical transformations. The review discusses how metal–organic frameworks can revolutionize this field by offering tailorable structures and active site tunability, enabling efficient and selective electrocatalytic processes.
Irena Senkovska, Yutong Luo, Ruyan Zhao, Jianjun Zhang, Mingchao Wang, Xinliang Feng, Eike Brunner, Stefan Kaskel   +7 more
wiley   +1 more source

Cool Kitchen: Processing Starch and Eggshell Powder into Sustainable Coatings for Passive Daytime Cooling

Advanced Functional Materials, EarlyView.
A food‐grade cooling composite made from starch and recycled eggshell powder offers a scalable, ultra‐low‐cost solution for passive daytime radiative cooling. Easily prepared using basic kitchen tools, this material empowers communities, even in areas with limited infrastructure, to stay cooler during worsening summer heat waves.
Qimeng Song, Evelyn Kubacki, Alexander Berger, Markus Retsch   +3 more
wiley   +1 more source

Analysis of the Target Detection Performance of Air-to-Air Airborne Radar Using Long-Range Propagation Simulation in Abnormal Atmospheric Conditions

Applied Sciences, 2020
In this paper, we propose the analysis of the target detection performance of air-to-air airborne radars using long-range propagation simulations with a novel quad-linear refractivity model under abnormal atmospheric conditions.
Tea Heung Lim, Minho Go, Chulhun Seo, Hosung Choo   +3 more
doaj   +1 more source