Results 41 to 50 of about 478 (164)

Does Ambient Backscatter Communication Need Additional Regulations? [PDF]

2018 IEEE International Symposium on Dynamic Spectrum Access Networks (DySPAN), 2018
Ambient Backscatter Communication (AmBC) is an emerging ultra-low power communication scheme which enables smart devices to communicate by modulating ambient radio frequency (RF) signals without requiring active RF transmission. AmBC can be interpreted as a spectrum sharing system that AmBC devices share the spectrum with the incumbent wireless ...
Kalle Ruttik, Ruifeng Duan, Riku Jantti, Zhu Han   +3 more
openaire   +1 more source

First LiDAR Observation of Quasi‐Periodic Structures in Mid‐Latitude E‐Region Meteoric Ca+ Layers

Geophysical Research Letters, Volume 53, Issue 5, 16 March 2026.
Abstract We report the first LiDAR observations of continuous quasi‐periodic (QP) metal density structures in mid‐latitude E‐region meteoric Ca+ layers using an all‐solid‐state LiDAR system in Beijing (40.4°N, 116.0°E). These QP Ca+ structures, with periods of 2–30 min and vertical wavelengths of ∼2–15 km, were primarily observed above 100 km.
Jixin Guo, Tao Yu, Lifang Du, Jin Wang, Xiangxiang Yan, Yan Yu, Wenyu Hao, Yifan Qi, Haoran Zheng, Guotao Yang   +9 more
wiley   +1 more source

Quantum Emitters in Hexagonal Boron Nitride: Principles, Engineering and Applications

Advanced Functional Materials, Volume 36, Issue 20, 9 March 2026.
Quantum emitters in hexagonal boron nitride have emerged as a promising candidate for quantum information science. This review examines the fundamentals of these quantum emitters, including their level structures, defect engineering, and their possible chemical structures.
Thi Ngoc Anh Mai, Md Shakhawath Hossain, Nhat Minh Nguyen, Yongliang Chen, Chaohao Chen, Xiaoxue Xu, Quang Thang Trinh, Toan Dinh, Toan Trong Tran   +8 more
wiley   +1 more source

Resource Allocation for Symbiotic Radio System With Fading Channels

IEEE Access, 2019
In this paper, we investigate the resource allocation problem for the symbiotic radio system, in which the passive backscatter transmission is parasitic in the primary transmission, and the cooperative receiver simultaneously detects the signals ...
Huayan Guo, Ying-Chang Liang, Ruizhe Long, Sa Xiao, Qianqian Zhang   +4 more
doaj   +1 more source

Engineered Optical Fibers for Deep‐Tissue Applications

Advanced Optical Materials, Volume 14, Issue 10, 13 March 2026.
This review establishes a foundational framework for designing optical fibers for deep‐tissue medicine. It systematically links material innovations like polymers and hydrogels with structural paradigms to enable state‐of‐the‐art diagnostics, including endoscopy and biosensing, and targeted therapeutics, guiding future clinical translation.
Yuzhen Li, Siyang Zheng, Wenzhao Li, Kai Chen, Tianting Zhong, Chi Man Woo, Weiran Pang, Chuqi Yuan, Xiaozhou Xiao, Xianguang Yang, Long Jin, Xiang Qian, Qiyao Tan, Changyuan Yu, Liwei Liu, Junle Qu, Puxiang Lai   +16 more
wiley   +1 more source

Wearable and Implantable Devices for Continuous Monitoring of Muscle Physiological Activity: A Review

Advanced Science, Volume 13, Issue 15, 13 March 2026.
Recent advances in materials and device engineering enable continuous, real‐time monitoring of muscle activity via wearable and implantable systems. This review critically summarizes emerging technologies for tracking electrophysiological, biomechanical, and oxygenation signals, outlines fundamental principles, and highlights key challenges and ...
Zhengwei Liao, Ata Golparvar, Mohammad Javad Bathaei, Filipe Arroyo Cardoso, Clementine M. Boutry   +4 more
wiley   +1 more source

The Evolution of a Polar Cap Patch Into a Blob in the Nightside Ionosphere: Direct Observations of Multiple Blob Formation Mechanisms Acting Simultaneously on the Same Plasma

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract A polar cap patch was observed to exit the polar cap to become a blob as it entered the auroral oval on the nightside of the Earth under moderately quiet geomagnetic conditions (Kp = 3−). Auroral particle precipitation led to an increase in the electron density of the blob.
S. J. Maguire, A. G. Wood, D. R. Themens, E. M. Henley, S. E. Milan, Y. Soobiah, K. Oksavik, W. J. Miloch, J. C. Coxon, M. G. Johnsen   +9 more
wiley   +1 more source

A Comprehensive Survey on Ambient Backscatter Communications Toward Zero-Energy Devices and Networks

IEEE Open Journal of the Communications Society
The future of wireless communications and the beyond fifth generation (B5G) and sixth generation (6G) standards are expected to constitute technologies that are self-sufficient in terms of energy requirements, without compromising on key performance ...
Ashwini H. Raghavendra, Sanjeev Gurugopinath, Sami Muhaidat   +2 more
doaj   +1 more source

Impacts of Transport Uncertainty on CO2 Over North America: Insights From Assessments of Two Global Models With Aircraft and Tower Measurements

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 3, 16 February 2026.
Abstract Accurate representation of CO2 transport is important for reliable flux inversions with global inversion systems. Previous studies have revealed systematic discrepancies between two widely used global transport models, GEOS‐Chem and TM5, in simulated CO2 distributions at mid‐latitudes.
Li Zhang, Kenneth J. Davis, Andrew E. Schuh, Andrew R. Jacobson   +3 more
wiley   +1 more source

Directional Light Scattering In Mie‐Resonant Si Particles With Ultra‐Thin Au Shells

Advanced Optical Materials, Volume 14, Issue 3, 19 January 2026.
Si@Au core‐shell particles have been produced to study their ability to directionally scatter light. We found that the heavily reported particulate shells do not overlap the electric and magnetic dipoles well, where continuous shells have better overlap. Experimental analyses, including nanomaterial characterization, EELS and single‐particle dark‐field
Emmanuel O. Idowu, Lucien Roach, Kevin O’ Connor, Jonathan G. C. Veinot, Sabrina Lacomme, Julien Proust, Jérôme Plain, Xiaoyan Li, Mathieu Kociak, Alexandre Baron, Virginie Ponsinet, Peter Wiecha, Glenna L. Drisko   +12 more
wiley   +1 more source