Results 21 to 30 of about 10,978,845 (289)
ULTRA LOW FREQUENCY EMISSIONS RANGING FROM 0.1 TO 3 Hz IN CIRCUMPOLAR AREAS
Solar-Terrestrial Physics, 2020 We examine the characteristics of oscillations of two types in the high-frequency edge of the ULF range (0.1–3 Hz), serpentine emission (SE), and discrete frequency dispersed signals (DS).
A.S. Potapov +2 more
doaj +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
Ultra-low frequency waves in the magnetosphere
, 2009 Ultra-low frequency waves, i.e. pulsations between 0.1 and 1,000 mHz, are an inherent feature of space plasmas. These plasmas are largely collisionless and hence waves play an important role as an agent to transfer energy, mass and momentum.
Lasse Boy Novock Clausen (7591403)
core +6 more sources
Ultra-low-noise Microwave to Optics Conversion in Gallium Phosphide
, 2021 Mechanical resonators can act as excellent intermediaries to interface single photons in the microwave and optical domains due to their high quality factors.
Moritz Forsch (7405349) +7 more
core +1 more source
Waves from the Sun: to the 100th anniversary of V.A. Troitskaya’s birth
Solar-Terrestrial Physics, 2017 It has been one hundred years since the birth of the outstanding scientist Professor V.A. Troitskaya. Her remarkable achievements in solar-terrestrial physics are widely known. For many years, Valeria A.
Guglielmi A.V., Potapov A.S.
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
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
A Novel Dual-Permanent-Magnet Mechanical Antenna for Pipeline Robot Localization and Communication
Sensors, 2023 The demand for pipeline inspection has promoted the development of pipeline robots and associated localization and communication technologies. Among these technologies, ultra-low-frequency (30–300 Hz) electromagnetic waves have a significant advantage ...
Yahao Dong +3 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