Results 31 to 40 of about 33,840 (257)

Azobenzene's Cross‐Scale Optics and Photonics: Molecular Photoswitching, Mesoscopic Material Motions, and Adaptive Devices

Advanced Materials, EarlyView.
Azobenzene photoswitches translate molecular‐scale E/Z photoisomerization into macroscopic material responses and device‐level photonic functions. This Review highlights how azobenzene research has evolved from molecular photochemistry to photoalignment, mass migration, photomechanics, and heat release, ultimately enabling holography, reconfigurable ...
Heeju Son, Soyul Kwak, Heerin Noh, Minsang Kim, Doyeon Noh, Subhayan Chakraborty, Jaewon Lee, YongDeok Cho, Kyeongsoo Kim, Taewoong Eom, Moonyoung Kim, Jangwon Kim, Hoyoung Lee, Soyoung Lee, Jaehun Kim, Grace G. D. Han, Shin‐Tson Wu, Stefano Oscurato, Arri Priimagi, Marina Saphiannikova, Seungwoo Lee   +20 more
wiley   +1 more source

Fundamental Limits of Target Parameter Estimation in OFDM-Based 3D NTN ISAC Systems

IEEE Open Journal of the Communications Society
This work investigates the fundamental performance bound of three-dimensional (3D) target localization and velocity estimation in monostatic orthogonal frequency-division multiplexing (OFDM)-based ISAC systems equipped with uniform rectangular arrays ...
Luca Arcangeloni, Enrico Testi, Lorenzo Pucci, Andrea Giorgetti   +3 more
doaj   +1 more source

Wireless Traffic Usage Forecasting Using Real Enterprise Network Data: Analysis and Methods

IEEE Open Journal of the Communications Society, 2020
Wireless traffic usage forecasting methods can help to facilitate proactive resource allocation solutions in cloud managed wireless networks. In this paper, we present temporal and spatial analysis of network traffic using real traffic data of an ...
Su P. Sone, Janne J. Lehtomaki, Zaheer Khan   +2 more
doaj   +1 more source

n‐Type Polymer Radio Frequency Rectifiers Operating at 18.5 GHz

Advanced Materials, EarlyView.
Combining an n‐doped polymer semiconductor with wafer‐scale asymmetric planar electrodes featuring work function‐engineered contacts yields radio‐frequency diodes and rectifying circuits operating at up to 18.5 GHz. The devices combine scalable manufacturing with an operating frequency previously unattainable by large‐area organic electronics ...
Lazaros Panagiotidis, Filip Aniés, Yiyang Yu, Mohammed Ghadiyali, Hendrik Faber, Zhanibek Bizak, Youssef Kabri, Pavlos Tzourmpakis, Suman Mandal, Linqu Luo, Temur Maksudov, Mohamad Insan Nugraha, Harold F. Mazo‐Mantilla, Patrice Vanelle, Julie Broggi, Khaled N. Salama, Udo Schwingenschlögl, Martin Heeney, Atif Shamim, Thomas D. Anthopoulos   +19 more
wiley   +1 more source

Performance of a low-power wide-area network based on LoRa technology: Doppler robustness, scalability, and coverage

International Journal of Distributed Sensor Networks, 2017
The article provides an analysis and reports experimental validation of the various performance metrics of the LoRa low-power wide-area network technology.
Juha Petäjäjärvi, Konstantin Mikhaylov, Marko Pettissalo, Janne Janhunen, Jari Iinatti   +4 more
doaj   +1 more source

When IEEE 802.11 and 5G Meet Time-Sensitive Networking

IEEE Open Journal of the Industrial Electronics Society, 2022
Many emerging applications require a higher level of flexibility, modularity, and efficiency but are dependent on advancements in communication infrastructure and distributed computing.
Mahin K. Atiq, Raheeb Muzaffar, Oscar Seijo, INaki Val, Hans-Peter Bernhard   +4 more
doaj   +1 more source

Space‐Time Coding Conformal Metasurfaces for Multifrequency Beam Steering and Shaping

Advanced Materials, EarlyView.
Space‐time coding conformal metasurfaces enable dynamic wave control on curved surfaces by combining programmable spatial patterns with temporal modulation. This study shows that a single conformal aperture can independently manipulate multiple frequency components, achieving multifunctional beam shaping and steering, with implications for ...
Filippo Pepe, Lei Zhang, Yi Ning Zheng, Xiao Qing Chen, Ivan Iudice, Giuseppe Castaldi, Marco Di Renzo, Tie Jun Cui, Vincenzo Galdi   +8 more
wiley   +1 more source

Biodegradable Wireless Soil Urea Sensor Using Metamaterial Perfect Absorber for Distributed Deployment in Precision Agriculture

Advanced Materials Technologies, EarlyView.
In this study, we propose a biodegradable wireless soil urea sensor for precision agriculture. The sensor's electromagnetic response varies depending on the urea concentration, allowing the measurement of relative soil urea concentrations by analyzing the time‐transient electromagnetic response.
Yu Tanaami, Ken Sakabe, Tetsuya Yarimizo, Yasutaka Murakami, Tetsuo Kan, Hiroaki Onoe   +5 more
wiley   +1 more source

Neural Network-Based Box-Oriented Framework for Behavioral Modeling and Digital Predistortion of Power Amplifiers

IEEE Transactions on Machine Learning in Communications and Networking
This article presents a new box-oriented framework and training strategy that integrates conventional models with neural networks (NNs) for accurate power amplifier (PA) behavioral modeling and digital predistortion (DPD).
Lesthuruge Silva, S. S. Krishna Chaitanya Bulusu, Nandana Rajatheva, Marko E. Leinonen, Nuutti Tervo   +4 more
doaj   +1 more source

Wood‐Derived Nanocellulose‐Biocarbon Fresnel‐Zone Plate Lenses for Sub‐THz Frequency Applications

Advanced Materials Technologies, EarlyView.
Wood‐derived nanocellulose and lignin‐based biocarbon were combined to fabricate fully bio‐based Fresnel zone plate (FZP) lenses for sub‐terahertz frequencies. These sustainable FZP lenses exhibit low dielectric loss and high directivity, achieving performance comparable to that of metallic references, and remain functional under environmental stress ...
Riikka Haataja, Mikko Kokkonen, Niina Halonen, Sami Myllymäki, Umair Rafique, Mandeep Singh, Ossi Laitinen, Heli Jantunen, Kristiina Oksman, Henrikki Liimatainen   +9 more
wiley   +1 more source