Results 31 to 40 of about 1,492,115 (344)
, 2021 This work presents a highly miniaturized, ultra-low-frequency, multi-stable and tri-hybrid portable energy harvester to harness structural and biomechanical vibration energy efficiently. This energy harvester is developed by using a novel multi-stability-
Chen Wang +4 more
semanticscholar +1 more source
The Ultra Low Frequency Force Ballistocardiograph in Acute Cardiomyopathy [PDF]
Circulation, 1967 In this study, ultra low frequency force ballistocardiograms were recorded throughout the course of various types of acute cardiomyopathy. Conditions studied included rheumatic carditis, lupus myocarditis, sarcoid carditis, viral myocarditis, acute glomerulonephritis, idiopathic myocarditis, and familial fibrous disease of the myocardium.
B, Phibbs, C R, Lowe, R W, Holmes
openaire +2 more sources
A low complexity digital frequency calibration with high jitter immunity for ultra-low-power oscillators [PDF]
Advances in Radio Science, 2019 This paper presents a highly efficient digital frequency calibration method for ultra-low-power oscillators in wireless communication systems. This calibration method locks the ultra-low-power oscillator's output frequency to the reference clock of the ...
M. Scholl, R. Wunderlich, S. Heinen
doaj +1 more source
Modulation of NTC frequencies by Pc5 ULF pulsations : experimental test of the generation mechanism and magnetoseismology of the emitting surface [PDF]
, 2009 Nonthermal continuum (NTC) radiation is believed to be emitted by the conversion of an electrostatic wave into an electromagnetic one, which takes place at the Earth's magnetic equator.
Le Rouzic, G. +8 more
core +1 more source
Measurement Science Review, 2017 The investigation presented in the paper was performed in the laboratories of the Department of Theoretical and Experimental Electrical Engineering, Faculty of Electrical Engineering and Communication, Brno University of Technology, between April 22 and ...
Hanzelka M. +5 more
doaj +1 more source
Annals of Geophysics, 2022 . Solar wind forcing, e.g., interplanetary shock and/or solar wind dynamic pressure pulses impacting Earth's magnetosphere, manifests many fundamental important space physics phenomena, including producing electromagnetic waves, plasma heating, and ...
Q. Zong
semanticscholar +1 more source
Clamped seismic metamaterials: ultra-low frequency stop bands
New Journal of Physics, 2017 The regularity of earthquakes, their destructive power, and the nuisance of ground vibration in urban environments, all motivate designs of defence structures to lessen the impact of seismic and ground vibration waves on buildings.
Y Achaoui +5 more
doaj +1 more source
, 2010 An ultra-low-power monolithic amplifier using 50-nm gate-length GaAs metamorphic high-electron-mobility transistor (MHEMT) has been designed and fabricated by a coplanar waveguide monolithic microwave integrated circuit ...
Lok, L.B. +18 more
core +1 more source
Ultra Wideband, Low Frequency, and Low Profile Combined Metamaterial-Ferrite Absorber
IEEE AccessThis paper presents a novel absorber topology that combines an absorbing metamaterial with a ferrite tile, resulting in an ultra-wideband absorber with a bandwidth of 196%, covering the frequency range of 10 MHz to 3500 MHz (1:350). The proposed absorber
Amir Sahraei +3 more
doaj +1 more source
Characterization of ultra low frequency (ULF) pulsations and the investigation of their possible source [PDF]
Annales Geophysicae, 2009 In this paper we present the results from the observation of ultra low frequency (ULF) pulsations in the Doppler velocity data from SuperDARN HF radar located at Goose Bay (61.94° N, 23.02° E, geomagnetic).
S. H. Mthembu +4 more
doaj +1 more source