Results 51 to 60 of about 118,033 (340)

The Realization of Multidirectional, Free‐Standing 3D Plasmonic Nanostructures via 3D Nanoprinting: A Case Study of Fractal Antennas

Advanced Functional Materials, EarlyView.
Free‐standing plasmonic gold‐based fractal antennas are fabricated by 3D nanoprinting, employing focused electron beam induced deposition and an optimized purification method to remove carbon while conserving structural fidelity. Simulation and experiment show broadband plasmonic activity, including customizable polarizability, thereby paving the way ...
Verena Reisecker, Robert Winkler, Ulrich Hohenester, Evelin Fisslthaler, Daniel Knez, Gerald Kothleitner, Georg Haberfehlner   +6 more
wiley   +1 more source

Metasurface Doppler Cloak for Broadband Radar Stealth

Advanced Physics Research
Concealing an aircraft is a multi‐faceted endeavor, notably involving radio and infrared frequencies. In a radar stealth context, it often translates to the reduction of the radar cross‐section (RCS).
Tanguy Lopez, Thomas Lepetit, Badreddine Ratni, Shah Nawaz Burokur   +3 more
doaj   +1 more source

Seeing inside the Body Using Wearable Sensing and Imaging Technologies

Advanced Healthcare Materials, EarlyView.
This review explores wearable technologies for noninvasive internal health monitoring. It categorizes approaches into indirect sensing (e.g., bioelectrical and biochemical signals) and direct imaging (e.g., wearable ultrasound and EIT), highlighting multimodal integration and system‐level innovation toward personalized, continuous healthcare.
Sumin Kim, Seunghun Han, Sehwan Park, Jahyun Koo   +3 more
wiley   +1 more source

Estimation of Rice Factor Ratio for Doubly Selective Fading Channels

IEEE Access, 2020
In wireless communication systems, Rice factor ratio (RFR) defined as K/(1 + K) is a key parameter not only to evaluate the quality of communication channel since it can reveal the severity of the small-scale fading, but also to be employed as a priori ...
Junfeng Wang, Yue Cui, Hao Jiang, Gaofeng Pan, Haixin Sun, Jianghui Li, Hamada Esmaiel   +6 more
doaj   +1 more source

Theory of the cold collision frequency shift in 1S--2S spectroscopy of Bose-Einstein-condensed and non-condensed hydrogen

, 2001
We show that a correct formulation of the cold collision frequency shift for two photon spectroscopy of Bose-condensed and cold non-Bose-condensed hydrogen is consistent with experimental data.
A S Bradley, C W Gardiner, Fried D G, Gardiner C W, Killian T C, Morgan S A, Morgan S A   +6 more
core   +1 more source

Biodegradable Implantable Electronics with Wireless Technology for Real‐Time Clinical Applications

Advanced Healthcare Materials, EarlyView.
The article explores how bioresorbable implantable electronics merge wireless communication and power delivery with biodegradable materials to enable real‐time clinical applications. It highlights advances in materials, system design, and medical uses across neural, cardiovascular, digestive, immune, and drug‐delivery systems.
Myeongki Cho, Jeong Woo Chae, Young‐Jin Park, Ki Jun Yu, Sang Min Won   +4 more
wiley   +1 more source

A Photonic Approach for Doppler Frequency Shift Measurement With Dispersion Medium

IEEE Photonics Journal, 2020
We propose and experimentally demonstrate a novel and simple approach to identifying both the direction and value of Doppler frequency shift (DFS) in this paper.
Chongyin Yi, Hao Chi, Tao Jin
doaj   +1 more source

Analysis of Radar Doppler Signature from Human Data [PDF]

, 2014
This paper presents the results of time (autocorrelation) and time-frequency (spectrogram) analyses of radar signals returned from the moving human targets.
Andrić, M., Bondzulić, B., Bujaković, D., Simić, S., Zrnić, B.   +4 more
core   +1 more source

Interactions Between Active Matters and Endogenous Fields

Advanced Materials, EarlyView.
This review synthesizes endogenous field information and computational methods in contexts such as cancer, wounds, and biofilms. It organizes NAMs and AAMs by sensing, transmitting, and executing functions, compares their limitations, and from these contrasts proposes design strategies for next‐generation AAMs, offering perspectives to foster ...
Jinwei Lin, Qiaoxin Guan, Jiangqi Feng, Shuqin Chen, Leilei Xu, Jianguo Guan, Samuel Sánchez   +6 more
wiley   +1 more source

Traffic control system and method [PDF]

, 1974
Frequency of carrier received by aircraft is measured and compared with reference to indicate magnitude of Doppler shift. One Doppler frequency range is selected and indicated by digital signal.
Allen, W. K., Hollenbaugh, R. C., Laughlin, C. R.   +2 more
core   +1 more source