The parameters of a number of high-voltage solid-state switches are studied. Based on the analysis of their work, a high-voltage pulse source with a size of 105 × 260 × 180 mm is assembled to supply ...cold plasma jets operating at the ac voltage of 220 V, 50 Hz.
Abstract
Human keratinocytes HaCaT and human carcinoma cells A431 have been treated in vitro by a cold argon plasma jet with an average power value of 0.72 mW/cm
2
. There were made estimations of ...proliferation rate and cell viability in a day after the exposition. In contrast to the cell viability of both cell lines there were revealed significant differences in proliferation rates of keratinocytes and cancer cells after plasma treatment.
Abstract
In this work the values of main electrical parameters of the microhollow cathode discharge in atmospheric air (peak discharge current, discharge ignition voltage) depending on the diameter ...of the hole in the cathode were obtained. It was experimentally found that at currents up to 2 mA, the discharge operated in a self-pulsing mode. According to the experimental results it was concluded that the value of the discharge ignition voltage at average discharge current exceeding 2 mA didn’t depend on the hole diameter.
This work is devoted to the study of the electrical characteristics of a microhollow cathode discharge in air at atmospheric pressure. It was found experimentally that the microhollow cathode ...discharge develops in a self-pulsing mode with an average current of hundreds of microamperes to units of milliampere. From to the experimental data, it is concluded that the self-pulsing frequency linearly depends on the consumed current. The values of the ignition voltage of the self-pulsing microhollow cathode discharge at different hole diameters (200–500 μm) were obtained.
Compact low-power high voltage pulse generator for DBD plasma jets was developed and assembled. There is a function of voltage pulse value and pulse repetition frequency regulation with the fascia ...control panel of the generator. The voltage amplitude can be set at the level of 0-6 kV. There are two frequency bands: 10-100 Hz and 0.1-1 kHz. The high voltage pulses of 12 μs duration have nanosecond rise and fall time 20 ns. The generator is powered by 220 V, 50 Hz. The overall dimensions of the device - 105×260×180 mm, its weight is less than 2 kg. The generator was successfully tested on DBD plasma jets. The average power up to 0.3-0.4 W was obtained in plasma depending on discharge electrode system.
A powerful pulsed dc converter has been developed for charging battery assemblies on board of hybrid and electric aircraft, which enables full battery capacity charging in cruise mode of the ...aircraft. This 10-kW modular design converter can operate in a buck–boost mode in a voltage range of 130–300 V with a current limit of 70 A at an output voltage of 150 V. The efficiency of the created converter is ~96–99%, depending on the power consumed in the load. The proposed modular design and multiphase control circuit can be used to create converters with different capacities and high efficiency.
An electrophysical apparatus for combined electroporation and iontophoresis treatment of biological membranes is described. Estimates of cell viability in living tissue equivalents exposed to pulsed ...current with a dc offset are provided. The values of the electrophysical pulse characteristics compatible with the viability of cells in the living tissue equivalents have been determined. The obtained data suggest that these electrophysical parameters could be used for transportation of pharmaceutical compounds through an equivalent of the round window membrane of the cochlea. A technique of drug administration across biological barriers can be developed based on pulsed electric field equipment to enable drug delivery into the inner ear.
A compact source of low-temperature plasma for biological and medical applications is proposed, which operates at kilohertz frequencies in the regime of flash-corona discharge with an energy of 0.1 ...mJ/pulse. The plasma source was tested in application to plasma pretreatment of green salad seeds. Plasma-treated seeds exhibited increased (by about 25%) germination speed as compared to that in the untreated control.
The study of the time-spatial radial development of the nanosecond dielectric barrier discharge in open air was carried out by means of segmented electrode technique. It was found experimentally that ...the discharge development depends on the air gap height. Discharge currents through the segments in 1-mm and 2-mm air gaps started almost simultaneously with a time delay relative to each other no more than 1 ns. An increase of the delay between discharge currents appearance and a certain order of their appearance was observed with increasing the height of the gap. Different development of the discharge correlated with a different growth rate of electric field strength in the gap and the ratio E/p.
A 20 kW pulsed buck–boost voltage converter with remote digital control of the output current and voltage was created for charging a battery as a part of a hybrid power plant of an aircraft. The ...converter operates in the mode of current limitation from 5 to 20 A and at a voltage from 800 to 1000 V when the voltage at its input changes from 800 to 1300 V. The experimentally obtained efficiency of the device is 98 ± 0.5%.
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