Results 11 to 20 of about 10,978,845 (289)
A family of AC amplifiers for ultra‐low frequency operation [PDF]
International Journal of Circuit Theory and Applications, 2021 AbstractA family of capacitively coupled alternating current (AC) amplifiers featuring ultra‐low (below 1 Hz) corner frequency is presented. This is achieved by using high‐gain devices which actively boost feedback resistance and thus reduce corner frequency.
Maite Martincorena-Arraiza +4 more
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Ultra wideband gigabit powerline communication [PDF]
, 2009 PhDPowerline Communication (PLC) has long been established for low data rate applications by the electric supply companies. Since 1991, the European CENELEC standard EN 50065 has ruled the use of 3 - 148.5KHz frequency range for narrow band PLC ...
Chen, Shuxian
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The occurrence mechanism and damping method of ultra‐low‐frequency oscillations
IET Renewable Power Generation, 2021 The ultra‐low‐frequency oscillation (ULFO) problem has reappeared in China recently. Although the hydraulic generator is supposed to have a strong connection to this problem, the conditions for ULFO appearance and detailed reasons are not clear yet.
Peng Wang +6 more
doaj +1 more source
Design of a Clinical Ultra-Low Frequency Ballistocardiograph [PDF]
Circulation, 1959 The potential advantages of an ultra-low frequency ballistocardiograph are presented.
R R, DONALDSON +3 more
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Radial Gradient Seismic Metamaterials with Ultra-Low Frequency and Ultra-Wide Band Gap
Applied Sciences, 2023 In this paper, a radial gradient seismic metamaterial (RGSM) is proposed. The structural unit cell is composed of an external square soil embedded with a triangular-cross-sectioned steel ring, which is filled at different angles of multiple steel rings ...
Qian Yang +4 more
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SCHUMANN RESONANCE IN THE MODEL OF THUNDERSTORM ACTIVITY, UNIFORMLY DISTRIBUTED OVER THE GLOBE [PDF]
Радиофизика и электроника, 2015 The interest in the phenomenon of Schumann resonances arises from the fact that it is one of the few tools that can help you learn the properties of the lower ionosphere, the measurement of which by direct methods is extremely difficult (the satellites ...
Y. P. Galyuk
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Antenna Study and Design for Ultra Wideband Communication Applications [PDF]
, 2006 PhDSince the release by the Federal Communications Commission (FCC) of a bandwidth of 7.5GHz (from 3.1GHz to 10.6GHz) for ultra wideband (UWB) wireless communications, UWB is rapidly advancing as a high data rate wireless communication technology.
Liang, Jianxin
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Ultra-Low-Frequency Acoustic Black Hole Radial Elastic Metamaterials
Applied Sciences, 2023 In this paper, we propose an acoustic black hole radial elastic metamaterial (AREM). Through the study of its dispersion relations, it is found that, compared with the conventional elastic metamaterial, the AREM gathers energy at the tip of the black ...
Lixia Li, Haiteng Hu, Xiaolan Wu
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Differential ultra low noise amplifier for low frequency noise measurements
AIP Advances, 2011 Almost all low noise voltage preamplifier suitable for application in the field of Low Frequency Noise Measurements (either commercially available or proposed in the literature) are single ended input amplifiers.
Graziella Scandurra +2 more
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Design of frequency invariant beamformer for broadband arrays [PDF]
, 2007 A simple method for the design of a class of arrays with frequency invariant beam patterns is proposed. Starting from the desired frequency invariant beam pattern of an n-D array, the proposed method uses a series of substitutions and an n-D inverse ...
Weiss, Stephan +5 more
core +4 more sources