Results 31 to 40 of about 2,126 (235)

Spatially‐Resolved Coherence of Organic Molecular Spins at Room‐Temperature

Advanced Functional Materials, EarlyView.
Molecular spin qubits are emerging as a promising quantum sensing technology. This paper studies the variation in coherence and sensitivity in both crystalline and thin‐film samples by combining microscopy and room temperature optically detected coherent control.
Adrian Mena, Nicholas P. Sloane, Max R. Bonengel, Cameron M. Gould, Scott A. Sulway, Dane R. McCamey   +5 more
wiley   +1 more source

A CMOS Quadrature Signal Generator for Impedance Spectroscopy Measurement Systems

Jornada de Jóvenes Investigadores del I3A, 2018
A CMOS fully integrated quadrature signal generator for on-chip impedance spectroscopy (IS) applications is presented. Frequency can be digitally tuned from 5 to 350 kHz with 12-bit resolution. Power consumption is 0.77 mW and active area is 0.129 mm2. Its suitability for the target application is validated with a Randles test impedance cell modelling ...
Pedro A. Martínez Martínez, Belén Calvo López, Nicolás Medrano Marqués, Alejandro Márquez Marzal   +3 more
openaire   +2 more sources

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

A Fast Fault Detection Scheme for Power Converters In Distributed Generation Systems

Eletrônica de Potência, 2012
In this paper, a fault detection algorithm based on voltage disturbances is proposed and analyzed. This method observes the voltage characteristics instead of the current amplitude, that is the most common approach in power distribution electrical ...
Gustavo M. S. Azevedo, Marcelo C. Cavalcanti, Francisco A. S. Neves, Fabricio Bradaschia   +3 more
doaj   +1 more source

Integrated Ultrasonic Platform for Bioelectronic Control through Biological Barriers Based on Metasurface

Advanced Science, EarlyView.
A metasurface‐enabled ultrasonic platform achieves precise multi‐focal control through biological barriers, real‐time physiology‐driven modulation, and simultaneous wireless power and data transmission. By unifying wavefront engineering, closed‐loop feedback, and acoustic communication, this work establishes key enabling technologies toward scalable ...
Chuanxin Zhang, Hanjie Xiao, Xue Jiang, Dean Ta   +3 more
wiley   +1 more source

Design and Analysis of an Ultra-Wideband High-Precision Active Phase Shifter in 0.18 μm SiGe BiCMOS Technology

Journal of Low Power Electronics and Applications
This paper presents an active phase shifter for phased array system applications, implemented using 0.18 μm SiGe BiCMOS technology. The phase shifter circuit consists of a wideband quadrature signal generator, a vector modulator, an input balun, and an ...
Hao Jiang, Zenglong Zhao, Nengxu Zhu, Fanyi Meng   +3 more
doaj   +1 more source

FTN multicarrier transmission based on tight Gabor frames

EURASIP Journal on Wireless Communications and Networking, 2017
A multicarrier signal can be synthesized thanks to a symbol sequence and a Gabor family (i.e., a regularly time–frequency shifted version of a generator pulse).
Alexandre Marquet, Damien Roque, Cyrille Siclet, Pierre Siohan   +3 more
doaj   +1 more source

Optical Windows for Transcranial Brain Imaging in Living Mice: Skull Thinning, Clearing, and Beyond

Advanced Science, EarlyView.
Longitudinal, noninvasive in vivo imaging is crucial for studying brain physiology. Advances in transcranial optical windows and multiphoton microscopy have improved imaging depth, but their performance often deteriorates over time. This work investigated various transcranial window approaches and found that skull regrowth limits image quality.
Yiming Fu, Gewei Yan, Zhentao She, Yingzhu He, Kangqi Liu, Jianan Qu   +5 more
wiley   +1 more source

Evaluating the performances of PI controller (2DOF) under linear and nonlinear operations of DFIG-based WECS: A simulation study

Heliyon, 2022
Owing to different stochastic characteristics of wind energy systems, there would commonly be uncertainties in the processes of wind energy conversion that may ultimately cause to severely degrade the quality of electric power production.
Belachew Desalegn, Desta Gebeyehu, Bimrew Tamrat   +2 more
doaj   +1 more source

Efficient Adsorption‐Based Direct Air Capture Via Triply Periodic Minimal Surface Architectures

Advanced Science, EarlyView.
Architected triply periodic minimal surface (TPMS) contactors reshape direct air capture by replacing straight‐channel diffusion limits with convection‐enhanced CO2 transport. Chaotic advection thins boundary layers and exposes fast adsorption sites, enabling 70%–75% more fast sites, 114% higher productivity, and 51.8% lower energy consumption than ...
Qingyang Shao, Zhuozhen Gan, Chengcheng Long, Man Zhang, Yihe Miao, Yuehui Li, Xuancan Zhu   +6 more
wiley   +1 more source