Results 61 to 70 of about 118,769 (293)
Advanced Materials, EarlyView.This study demonstrates a self‐assembly process to generate free‐standing piezoelectric nanomembranes, forming ultracompact microtubular acoustic wave sensors and actuators. The miniaturized 3D piezoelectric platform reported in this work can be applied in telecommunication, energy harvesting, and acoustofluidics. Moreover, the 3D self‐assembly can add
Raphaël C. L‐M. Doineau +9 more
wiley +1 more source
Performance Analysis of OTFS Framework Over Wideband Time-Varying Channels
IEEE Open Journal of the Communications SocietyOrthogonal Time Frequency Space (OTFS) modulation has garnered significant attention for its robustness in high-mobility communication scenarios. Existing research predominantly focuses on narrowband time-varying channels, where Doppler effects manifest ...
Ziqiang Gao +8 more
doaj +1 more source
IEEE Access, 2022 The Doppler effect critically degrades the performance of orthogonal frequency division multiplexing (OFDM) systems in general. This problem is significantly worse for underwater acoustic (UWA) communication systems due to the distinct characteristics of
Van Duc Nguyen +3 more
doaj +1 more source
, 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 +6 more
core +1 more source
Frequency Analysis of Reflex Velocities of Stars with Planets [PDF]
, 1998 Since it has become possible to discovery planets orbiting nearby solar-type stars through very precise Doppler-shift measurements, the role of methods used to analyze such observations has grown significantly.
Andrzej J. Maciejewski +2 more
core +2 more sources
Effect of Hematocrit upon the Shift in Doppler Frequency
Experimental Biology and Medicine, 1971 ConclusionOver a wide range of erythrocyte concentration (10-68 vol%) there is not an appreciable change in the Doppler frequency shift when blood flow conditions and temperature remain constant.
D D, Michie, C P, Cain
openaire +2 more sources
Metamaterial Antennas Enhance MRI of the Eye and Occipital Brain
Advanced Materials, EarlyView.A radiofrequency antenna platform comprising planar and bend configurations is developed, incorporating structurally integrated epsilon‐negative metamaterial unit cells to enhance MRI. These antennas enable high‐resolution in vivo human MRI of the eye, orbit, and occipital brain. Comprehensive validation, including simulations, phantom experiments, SAR,
Nandita Saha +14 more
wiley +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. +4 more
core +1 more source
Light shifts in atomic Bragg diffraction [PDF]
, 2016 Bragg diffraction of an atomic wave packet in a retroreflective geometry with two counterpropagating optical lattices exhibits a light shift induced phase. We show that the temporal shape of the light pulse determines the behavior of this phase shift: In
Abend, Sven +4 more
core +3 more sources
Advanced Materials, EarlyView.This study reports the fabrication of MRI‐compatible elastomeric micro‐balloons via a multi‐step bubble casting process, where the monolithic elastomeric wall is selectively stiffened for reversible and controlled inflation and elasticity, depending on the target vessels for graded occlusion of cerebral arteries.
Jong Bin Kim +10 more
wiley +1 more source