Search Results - "Shulga, V.M."

Extra-low power consumption amplifier based on HEMT in unsaturated mode for use at subkelvin ambient temperatures by Korolev, A.M., Shulga, V.M., Tarapov, S.I.

“…•We propose new approach to develop deep-cooled amplifiers on unsaturated-mode HEMTs.•We characterized PHEMT amplifiers at f=0.2–0.8GHz and temperatures down…”
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Measurement of brightness temperature of two-dimensional electron gas in channel of a high electron mobility transistor at ultralow dissipation power by Korolev, A.M., Shulga, V.M., Turutanov, O.G., Shnyrkov, V.I.

“…•We propose a simple method to directly measure the 2DEG temperature of HEMT channel•We found the optimal dc regimes for HEMTs regarding to the back action…”
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PHEMT as a circuit element for high impedance nanopower amplifiers for ultra-low temperatures application by Korolev, A.M., Shulga, V.M., Gritsenko, I.A., Sheshin, G.A.

“…•We measure the HEMT characteristics at temperature of 50mK for the first time.•To characterize the HEMT, the relative parameters are proposed to use.•We show…”
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Results of the Development and Introduction of a Method of Multi-Portion Gravimetric Measuring for Refilling Tanks of the Fregat Upper Stage at the Guiana Space Center by Borisov, V. G., Shul’ga, V. M., Lebedev, A. G., Denisov, O. E., Sova, A. N.

“…Results of applying a method of multi-portion weight measuring for refilling tanks of the Fregat upper stage at the Guiana Space Center are presented. The…”
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Uncooled low noise frontend of the receiver system for ground-based monitoring of stratospheric ozone and carbon monoxide by Forkman, P.M., Shulga, V.M., Piddiachii, V.I., Korolev, A.M., Myshenko, V.V., Myshenko, A.V.

“…In this paper, we present an uncooled frontend of a receiver system for regular long-term ground-based observations of stratospheric and mesospheric ozone (and…”
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3-mm wave spectroradiometer for studies of atmospheric trace gases by Piddyachiy, V. I., Shulga, V. M., Myshenko, V. V., Korolev, A. M., Myshenko, A. V., Antyufeyev, A. V., Poladich, A. V., Shkodin, V. I.

“…We developed a high-sensitivity receiving and measuring facility designed for observations of the ozone O 3 and carbon monoxide CO spectral lines by the method…”
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Objectives of a prospective Ukrainian orbiter mission to the moon by Shkuratov, Yu.G., Lytvynenko, L.M., Shulga, V.M., Yatskiv, Ya.S., Vidmachenko, A.P., Kislyulk, V.S.

“…Ukraine has launch vehicles that are able to deliver about 300 kg to lunar orbit. A future Ukrainian lunar program may propose a polar orbiter. This orbiter…”
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Ultra-low-noise amplifier for the ranges 0.5-1, 1-2, 2-4 GHz: design peculiarities by Korolev, A.M., Shulga, V.M.

“…Ultra-low-noise amplifiers, having noise temperature 10-20 K under moderate (uncryogenic) cooling, for the ranges 0.5-1, 1-2, 2-4 GHz are presented. The design…”
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Low-Noise pHEMT Amplifier Operating at Extra-Low Supply Voltage and Power by Korolev, A.M., Shulga, V.M.

“…We report on the successful development of an extra-low supply single-drain-operated amplifier intended for use as a general-purpose LNA for the practical…”
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Results of investigation of maser radiation sources in H2O line (1,35 cm) using RT-22 KrAO in 2007 by Volvach, L.N., Shulga, V.M., Volvach, A.E.

“…Spectral investigations have been carried out regarding emission lines of different cosmic molecules within the wide frequency band from 1.5 GHz to 115 GHz…”
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Low-noise extra-low-power amplifiers for future radio astronomy receivers by Korolev, A.M., Shulga, V.M.

“…A new approach to design of low-noise amplifiers with extremely low power consumption is given. The power consumption of 50 microwatt per stage with 10-dB-gain…”
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Low-noise pHEMT amplifier operating at extra-low supply voltage and power by Korolev, A.M., Shulga, V.M.

“…In this paper, a low-noise pHEMT amplifier with an extra-low supply (0.25 V, 2 mA) is presented. The two-stage amplifier, based on low-cost commercially…”
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Investigation of DC precise voltage source for use as Zener transport standard by Karpov, O.V., Kutovoy, V.D., Gumenuk, V.S., Shulga, V.M., Shakizgyama, F.R., Sarandi, A.E.

“…Twenty precise compact DC voltages sources based on 6.4-V Zener diodes have been manufactured and investigated by the NPO VNIIFTRI measuring system during the…”
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Low Losses Wide Band Diplexer for MM Wave Heterodyne Receiver by Shulga, V.M., Myshenko, V.V., Myshenko, A.V.

“…Broadband waveguide diplexer is suggested for mm wave heterodyne receiver. Performance characteristics of some prototypes are explored over the 85...115 GHz…”
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5 GHz Receiver for Maser Sources Observations with RT-22 CrAO by Volvach, A.E., Volvach, L.N., Strepka, I.D., Shulga, V.M.

“…The no cooled 5 GHz radiometer has been introduced into operation at 22-m radio telescope CAO. The system temperature was 60 K. We report the observations of…”
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Ultra-low-noise cooled microwave PHEMT amplifiers for radio astronomy applications by Korolev, A.M., Shulga, V.M.

“…The main aim of this work was to design octave-band amplifiers on commercially available transistors over the frequency range from 0.5 to 4 GHz with emphasis…”
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Microwave Spectrometer 85...115 GHz Frequency Band for Maser Lines Observations on RT-22 by Zubrin, S.J., Antyufeev, A.V., Korolev, A.M., Myshenko, V.V., Myshenko, A.V., Piddyachiy, V.I., Shulga, V.M.

“…Low noise cryogenic microwave spectrometer (MS) for 85...115 GHz band is suggested for cosmic maser lines observations on RT-22 with high spectral resolution…”
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Peculiarities of CO molecule radiation at mm wavelengths in interstellar molecular clouds by Shulga, V.M., Antuyfeyev, A.V., Lavrik, I.V.

“…The processes of active star formation in interstellar molecular clouds lead molecules to a nonequilibrium distribution throughout the available energy levels…”
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Ultra-low-noise Schottky diode mixer receiver from 85 to 115 GHz by Shulga, V.M., Piddiachii, V.I., Korolev, A.M., Myshenko, V.V., Myshenko, A.V.

“…The ultra-low-noise 3 mm wave Schottky diode mixer receiver is described. Noise performances of the receiver have been investigated at standard environment -40…”
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Investigation of dc precise voltage sources for use as Zener transport standard by Karpov, O.V., Shulga, V.M., Shakirzyanova, F.R., Sarandi, A.E.

“…20 precise compact voltage sources based on Zener diodes were manufactured. These sources were under investigation at measuring system in NPO VNIIFTRI during…”
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