Results 91 to 100 of about 7,039 (276)

Demystifying the Power Scaling Law of Intelligent Reflecting Surfaces and Metasurfaces [PDF]

, 2019
Intelligent reflecting surfaces (IRSs) have recently attracted the attention of communication theorists as a means to control the wireless propagation channel. It has been shown that the signal-to-noise ratio (SNR) of a single-user IRS-aided transmission
Bjornson E., Emil Bjornson, Luca Sanguinetti, Sanguinetti L.   +3 more
core   +1 more source

Machine Learning‐Supported Analysis for Predicting and Visualizing Nonlinear Relationships Between Material Properties in Electroplated Chromium Layers

Advanced Engineering Materials, EarlyView.
This study applies machine learning regression to predict chromium layer thickness in decorative trivalent chromium electroplating, using 441 experiments from laboratory‐scale (1L) and pilot‐scale (14L) setups. Tree‐based models, particularly CatBoost, outperformed linear regression by capturing nonlinear parameter interactions (R2$R^2$ up to 0.77 ...
Christoph Baumer, Christopher Mai, Luca Eisentraut, Andreas Bund, Ricardo Buettner   +4 more
wiley   +1 more source

Reflecting Intelligent Surfaces Assisted High-Rank Ultra Massive MIMO Terahertz Channels

peer reviewedReflective Intelligent Surface (RIS)-assisted Ultra-Massive MIMO (Um-MIMO) systems in the terahertz (THz) spectrum are gaining attention for surpassing current wireless system limitations.
SOLANKI, Sourabh, SHEEMAR, Chandan Kumar, KHAN, Wali Ullah, CHATZINOTAS, Symeon, ABDULLAH, Zaid, LAGUNAS, Eva   +5 more
core   +1 more source

Design and Analysis of Compression–Torsion Coupling Metamaterials Using the Golden Section Method

Advanced Engineering Materials, EarlyView.
A novel compression–torsion metamaterial is engineered using inclined rods and symmetry breaking. To optimize its torsional performance, the golden section method is employed. The mechanical response of the metamaterial is validated through both numerical analysis and experimental validation.
Amirhossein Hassani, Sara Bagherifard
wiley   +1 more source

Lyapunov Drift-Plus-Penalty Based Resource Allocation in IRS-Assisted Wireless Networks with RF Energy Harvesting [PDF]

Radioengineering, 2022
We propose a resource allocation policy for intelligent reflective surface (IRS)-assisted wireless powered communication network (WPCN) where the energy harvesting (EH) users (EHUs) have finite energy storage and data buffers, for storing the harvested ...
S. Pejoski, Z. Hadzi-Velkov, T. Shuminoski   +2 more
doaj  

Electromagnetic Modeling of Holographic Intelligent Reflecting Surfaces at Terahertz Bands

, 2021
Intelligent reflecting surface (IRS)-assisted wireless communication is widely deemed a key enabler for 6G systems. The main challenge in deploying an IRS-aided terahertz (THz) link, though, is the severe propagation losses at high frequency bands. Hence,
Matthaiou, Michail; id_orcid, Dovelos, Konstantinos, Bellalta, Boris, Hien Quoc Ngo, Konstantinos Dovelos, Stylianos D. Assimonis, Ngo, Hien Quoc, Michail Matthaiou, Assimonis, Stylianos D., Boris Bellalta, Quoc Ngo, Hien; id_orcid, Matthaiou, Michail   +11 more
core   +1 more source

From Food to Power: Hydrogel Thermoelectrics for Ingestible Electronics

Advanced Functional Materials, EarlyView.
We introduce a fully edible thermoelectric–electrochromic platform that harvests heat from food and converts it into a visible color change. N‐type and p‐type hydrogel thermoelectric generators connected in series power anthocyanin‐based electrochromic displays, demonstrating the feasibility of safe, biodegradable, ingestible systems for on‐food ...
Antonia Georgopoulou, Bokeon Kwak, Dario Floreano, Esther Amstad   +3 more
wiley   +1 more source

Intelligent Reflecting Surfaces Enabled Visible Light Positioning [PDF]

Light-emitting-diode based visible light positioning (VLP) system(s) can provide high-precision positioning accuracy, but require an unobstructed line-of-sight (LoS) environment.
Abualhayja'a, Mohammad, Abumarshoud, Hanaa, Siddiqui, Maraj Uddin Ahmed, Mohjazi, Lina, Imran, Muhammad Ali   +4 more
core   +1 more source

Intermediate Resistive State in Wafer‐Scale Vertical MoS2 Memristors Through Lateral Silver Filament Growth for Artificial Synapse Applications

Advanced Functional Materials, EarlyView.
In MOCVD MoS2 memristors, a current compliance‐regulated Ag filament mechanism is revealed. The filament ruptures spontaneously during volatile switching, while subsequent growth proceeds vertically through the MoS2 layers and then laterally along the van der Waals gaps during nonvolatile switching.
Yuan Fa, Milan Buttberg, Ke Ran, Rana Walied Ahmad, Dennis Braun, Lukas Völkel, Jimin Lee, Sofía Cruces, Bart Macco, Bárbara Canto, Holger Lerch, Thorsten Wahlbrink, Holger Kalisch, Michael Heuken, Andrei Vescan, Joachim Mayer, Zhenxing Wang, Ilia Valov, Stephan Menzel, Max C. Lemme   +19 more
wiley   +1 more source

Optimization of Intelligent-Reflecting-Surface-Enabled Covert Communication in Multi-Sensor Systems

Applied Sciences
This study investigates covert communication in multi-sensor systems employing Intelligent Reflecting Surfaces (IRSs). Different from previous works, we focus on optimizing transmission amplitudes and phase angles for a 2-BPSK codebook in the presence of
Huiru Feng, Xiaopeng Ji, Ruizhi Zhu, Xinrui He, Sen Qiao   +4 more
doaj   +1 more source