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Suppressing Activity of an Array of Coupled Fitzhugh-Nagumo Oscillators

100%
Adomaitienė E., Mykolaitis G., Bumelienė S., Tamaševičius A.
Acta Physica Polonica A
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2016
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vol. 129
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issue 4
562-564
EN
An extremely simple method for stabilizing unstable steady states in an array of coupled neuronal FitzHugh-Nagumo type oscillators is described. A two-terminal electronic feedback controller has been developed. The feedback circuit, when coupled to an array of oscillators, damps the spiking neurons, thus does away with the effect of synchronization. Both, numerical simulations and hardware experiments with the electronic circuits have been performed. The results for an array of three mean-field coupled FitzHugh-Nagumo oscillators are presented.
2
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"Indoor" Protection of Electronic Systems by Means of High-Pass Negative Feedback

100%
Tamaševičius A., Mykolaitis G., Bumelienė S., Tamaševičiūtė E.
Acta Physica Polonica A
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2009
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vol. 115
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issue 6
1164-1166
EN
An extremely simple first order RC high-pass filter is suggested to suppress harmful radio frequency oscillations, induced by high power electromagnetic pulses. Specifically, a broadband single stage transistor amplifier with a parasitic wiring inductance and also the parasitic junction and mounting capacitances are investigated both numerically and experimentally in the very high and ultrahigh frequency bands.
3
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Microplasma Noise Stimulated by Microwave Electric Field

88%
Namajūnas A., Tamaševičius A., Mykolaitis G., Bumelienė S., Požela J.
Acta Physica Polonica A
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2005
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vol. 107
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issue 2
369-372
EN
Si and GaAs avalanche diodes containing microplasmas are investigated. Microwave field applied to the diode in addition to reverse dc bias results in considerable spread of noise spectrum and in the increase of noise power. The microplasma noise spectra cover very high (30 to 300 MHz) and ultrahigh (300 to 1000 MHz) frequency bands, while the effective noise temperature is about 10^8 K.
4
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Fast Chaos with Slow p-n Junction Diodes

88%
Mykolaitis G., Tamaševičiūtė E., Miškinis R., Bumelienė S., Tamaševičius A.
Acta Physica Polonica A
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2008
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vol. 113
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issue 3
971-974
EN
We demonstrate both experimentally and numerically that slow recovery p -n junction diodes can be exploited to generate chaos at high megahertz frequencies. An extremely simple resonator consisting of an inductor in parallel with a diode when externally periodically driven exhibits chaotic response.
5
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Application of Ultrafast Schottky Diodes to High Megahertz Chaotic Oscillators

76%
Mykolaitis G., Tamaševičius A., Bumelienė S., Namajūnas A., Pyragas K., Pyragas V.
Acta Physica Polonica A
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2005
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vol. 107
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issue 2
365-368
EN
The considered chaotic oscillator consists of an amplifier, 2nd order LC resonator, Schottky diode and an extra capacitor in parallel to the diode. The diode plays the role of a nonlinear device. Chaotic oscillations are demonstrated numerically and experimentally at low as well as at high megahertz frequencies, up to 250 MHz.
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