Results 111 to 120 of about 2,209,550 (335)

An Optimized Propagation Model based on Measurement Data for Indoor Environments

Journal of Telecommunications and Information Technology, 2018
Propagation is an essential factor ensuring good coverage of wireless communications systems. Propagation models are used to predict losses in the path between transmitter and receiver nodes. They are usually defined for general conditions.
Marco Morocho-Yaguana, Patricia Ludena-Gonz´alez, Francisco Alberto Sandoval Norena, Alexandra Erreyes-Dota   +3 more
doaj   +1 more source

Four‐Point Bending Tests at High Temperatures on Commercial MgO‐C Refractory Bricks with and Without Recyclate Considering Different Carbon Contents

Advanced Engineering Materials, EarlyView.
Four‐point bending tests are conducted in an argon atmosphere on commercial MgO‐C brick grades with and without MgO‐C recyclate from room temperature up to 1300 °C. No detrimental effect of the MgO‐C recyclates on bending strength is found. Instead, a decisive influence of the total carbon content is observed, with lower total carbon contents ...
Alexander Schramm, Lukas Knöchel, Thomas Schemmel, Christos G. Aneziris, Anja Weidner, Horst Biermann   +5 more
wiley   +1 more source

An Enhanced Path Loss Model for Maritime Communication Channels

IEEE Access
This study proposes a new ocean propagation loss model, the curved ground loss (CGL) model, to improve the existing models by considering the effects of sea surface roughness, earth curvature, and sea wave height on signal fading at the reflection point.
Chongquan Wang, Shengming Jiang
doaj   +1 more source

Al–Cu Composite Casting of Laser‐Deoxidized Copper: Bonding, Interfacial Chemistry, and Thermal Conductivity

Advanced Engineering Materials, EarlyView.
This study investigates laser‐based oxide removal of Cu inserts in oxygen‐free conditions and examines long‐term oxidation kinetics and surface chemistry under different atmospheres via X‐ray photoelectron spectroscopy. Al–Cu compound casting with differently oxidized surfaces is performed, and intermetallic phase formation, morphology, and thermal ...
Timon Steinhoff, Finn‐Lennard Janthur, Sascha Zimmermann, Sarah Seffer, Jörg Hermsdorf, René Gustus, Ludger Overmeyer, Wolfgang Maus‐Friedrichs, Hans Jürgen Maier, Christian Klose   +9 more
wiley   +1 more source

Balancing Prediction Accuracy and Explanation Power of Path Loss Modeling in a University Campus Environment via Explainable AI

Future Internet
For efficient radio network planning, empirical path loss (PL) prediction models are utilized to predict signal attenuation in different environments. Alternatively, machine learning (ML) models are proposed to predict path loss.
Hamed Khalili, Hannes Frey, Maria A. Wimmer   +2 more
doaj   +1 more source

Further investigation of empirical path-loss modeling for short forested paths

Proceedings of the 2012 IEEE International Symposium on Antennas and Propagation, 2012
This paper reports an experimental study of path-loss modeling in foliage environments for VHF and UHF short-range applications. Through the investigation, it is found that although the path loss in a forest can be conveniently modeled using linear regression, it is difficult to apply the extracted information to other forests due to the variety of ...
Lee, Yee Hui, Meng, Yu Song
openaire   +2 more sources

Resistance Rapid Heating of Aluminum Coatings in an Extreme High Vacuum–Adequate Atmosphere for Hot Stamping

Advanced Engineering Materials, EarlyView.
The subject of this work is the development of a corrosion‐protective coating on steel sheets for form hardening. Rapid heating in an extreme high vacuum (XHV)‐adequate atmosphere is a useful method to prevent oxidation during alloying of 22MnB5 and aluminum to obtain a metallurgical bonding.
Lorenz Albracht, Alexander Schnettger, Ulrich Holländer, Sven Hübner, Bernd‐Arno Behrens, Hans Jürgen Maier   +5 more
wiley   +1 more source

Analytic Approximation of Free-Space Path Loss for Implanted Antennas

IEEE Open Journal of Antennas and Propagation
Implantable wireless bioelectronic devices enable communication and/or power transfer through RF wireless connections with external nodes. These devices encounter notable design challenges due to the lossy nature of the host body, which significantly ...
Mingxiang Gao, Sujith Raman, Zvonimir Sipus, Anja K. Skrivervik   +3 more
doaj   +1 more source

Analytical Modeling of the Path-Loss for Reconfigurable Intelligent\n Surfaces -- Anomalous Mirror or Scatterer ? [PDF]

, 2020
Marco Di Renzo, Fadil Habibi Danufane, Xiaojun Xi, Julien de Rosny, Sergei Tretyakov   +4 more
openalex   +1 more source

A Robust Machine Learning Approach for Path Loss Prediction in 5G Networks with Nested Cross Validation [PDF]

, 2023
İbrahim Yazıcı, Emre Güreş
openalex   +1 more source