Персона: Гармаш, Александр Александрович
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Bit error rate evaluation in high speed communication channels
© 2019 Published under licence by IOP Publishing Ltd. This work offers calculate technique probability errors in transmitter - receiver path during the design phase with apply theory of probability elements, which is based on results of transient process modeling. As estimation, designed method was verified by comparison his results with computer experiment results. Implementation and using variants of represented algorithm are offered.
Emission of CH∗ and C 2 ∗ during the high-temperature oxidation of propane in reflected shock waves
© 2019 Published under licence by IOP Publishing Ltd. The autoignition of a stoichiometric propane-oxygen mixture diluted with argon was studied behind reflected shock waves in the temperature range of 1230-1700 K at the total concentration of [M] 50 ∼ 10 -5 mol/cm 3 . Emission signals from electronically excited CH∗ (at λ = 429 nm) and C 2 ∗ (at λ = 516 nm) radicals were recorded. It was found that the CH∗ and C 2 ∗ emission time profiles reached their maxima almost simultaneously over the entire temperature range covered. The temperature dependence of the ignition delay time measured from the time of reaching the maximum by the CH∗ emission signal was simulated within the framework of several published data kinetic mechanisms. It was found that, at temperatures below 1400 K, all the kinetic models tested predict ignition delay times severalfold longer than that experimentally observed. Using a sensitivity analysis to the reaction rate constants in the induction period, the main reactions that affect the ignition delay time were identified.
Broadband push-pull power amplifier design methodology based on the GaN component base for high-performance nonlinear junction detectors
The paper presents a description of design methodology for wide-band push-pull large-signal power amplifier based on GaN transistor with an output power of more than 10 W for high-performance Nonlinear Junction Detectors, which allows achieving optimal convergence of the theoretical model in practice, as well as increasing the efficiency of the power amplifier while maintaining a linear gain characteristic.
An experimental and simulation study of the effect of acetone and propane additives on soot formation in acetylene pyrolysis behind reflected shock waves
© 2019 Published under licence by IOP Publishing Ltd. Experimental investigations and detailed kinetic simulations of the formation of soot particles during pyrolysis of mixtures of acetylene with acetone and propane behind reflected shock waves are performed. Acetone and propane additives are found to substantially promote the process of soot formation as compared with that in acetylene-argon mixtures. Detailed kinetic simulations closely reproduce our own experimental results and published data. The kinetic model of soot formation is comprised of 4782 direct and reverse reactions involving 372 species. The predictive possibility of the kinetic model of soot formation is tested by describing the effect of acetone and propane additives to acetylene-argon mixtures on soot formation. All the kinetic parameters of the unified kinetic model are kept constant. The indicated additives enhance the soot yield because polyyne-dominated pathway of soot nucleation, characteristic of unseeded acetylene-argon mixtures, is augmented by the aromatic pathway, typical of most hydrocarbons.