Victor Ivanov

Mr. Victor Ivanov

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Academic Career Length

28Years (1999-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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8 July 2023 in Polymers
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Journal Article
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SSStanislav Stankevich
Stanislav Stankevich
JSJevgenijs Sevcenko
Jevgenijs Sevcenko
Olga BulderbergaOlga Bulderberga
Olga Bulderberga
ADAleksandrs Dutovs
Aleksandrs Dutovs
DEDonats Erts
Donats Erts
Andrey AniskevichAndrey Aniskevich
Andrey Aniskevich
During this study, the resistivity of electrically conductive structures 3D-printed via fused filament fabrication (FFF) was investigated. Electrical resistivity characterisation was performed on various structural levels of the whole 3D-printed body, starting from the single traxel (3D-printed single track element), continuing with monolayer and multilayer formation, finalising with hybrid structures of a basic nonconductive polymer and an electrically conductive one. Two commercial conductive materials were studied: Proto-Pasta and Koltron G1. It was determined that the geometry and resistivity of a single traxel influenced the resistivity of all subsequent structural elements of the printed body and affected its electrical anisotropy. In addition, the results showed that thermal postprocessing (annealing) affected the resistivity of a standalone extruded fibre (extruded filament through a printer nozzle in freefall) and traxel. The effect of Joule heating and piezoresistive properties of hybrid structures with imprinted conductive elements made from Koltron G1 were investigated. Results revealed good thermal stability within 70 °C and considerable piezoresistive response with a gauge factor of 15–25 at both low 0.1% and medium 1.5% elongations, indicating the potential of such structures for use as a heat element and strain gauge sensor in applications involving stiff materials and low elongations.
20 January 2020 in EPJ Web of Conferences
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ALAnatoli Loutchanski
Anatoli Loutchanski
VFViktors Fjodorovs
Viktors Fjodorovs
VIVictor Ivanov
Victor Ivanov
VOVadims Ogorodniks
Vadims Ogorodniks
The results of a study of some ways to improve spectroscopy characteristics of the CdZnTe quasi-hemispherical detectors when working in high gamma radiation fluxes are presented. It was shown that the use of IR illumination with a wavelength of 1050 nm or 1200 nm or at slight warm-up of the detector to +30°C … +40°C can significantly improve spectroscopy performance of the CdZnTe detectors of size 3.5 mm × 3.5 mm × 1.75 mm when operating in a tested gamma-radiation field with a dose rate up to 590 mGy/h.
22 October 1999
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Conference Paper
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DSDarma P Sharma
Darma P Sharma
BRBrian D Ramsey
Brian D Ramsey
JMJ D Meisner
J D Meisner
RARobert A Austin
Robert A Austin
HSHeikki Sipila
Heikki Sipila
ASA D Sokolov
A D Sokolov
We have evaluated 2 small-pixel Cadmium-Zinc-Telluride arrays with thickness of 1 and 2 mm that were fabricated for MSFC by Metorex and Baltic Science Institute. Each array was optimized for temperature and collection bias and was then exposed to Cadmium109, Am241 and Fe55 laboratory isotopes to measure the energy resolution for each pixel. The arrays were then scanned with a finely-collimated x-ray beam, of width 100 micron, to examine pixel to pixel and inter-pixel charge collection efficiency. Preliminary results from the array test are presented.
10 October 2023 in Sensors
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VIVictor Ivanov
Victor Ivanov
VFViktors Fjodorovs
Viktors Fjodorovs
ALAnatoli Loutchanski
Anatoli Loutchanski
MPMaksims Piskunovs
Maksims Piskunovs
VIValerijs Ivanovs
Valerijs Ivanovs
This article discusses the possibilities and limitations of CdZnTe (CZT) quasi-hemispherical detectors operating over a wide temperature range and at high-gamma radiation fluxes. The results of the negative influence of low- and high-operating temperatures, as well as high-radiation fluxes on spectrometric characteristics of CZT detectors and possible ways to eliminate performance deterioration, are presented. The impact of infrared (IR) illumination parameters, such as wavelength and irradiation intensity on the spectroscopy performance of detectors, was investigated. A correctly chosen IR illumination wavelength and intensity were shown to significantly improve the energy resolution of CZT quasi-hemispherical detectors, allowing their stable operation in high-gamma radiation fluxes and extend the operating temperature range toward low temperatures. The influences of bias voltage values and temperatures on the quasi-hemispherical CZT detectors’ operating ability at high-gamma radiation fluxes were studied.
16 December 2023 in Sensors
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VIVictor Ivanov
Victor Ivanov
VFViktors Fjodorovs
Viktors Fjodorovs
SHSergejs Hinoverovs
Sergejs Hinoverovs
ALAnatoli Loutchanski
Anatoli Loutchanski
VOVadims Ogorodniks
Vadims Ogorodniks
SVSergejs Vidinejevs
Sergejs Vidinejevs
The spectrometric characteristics of CdZnTe detectors are largely determined by the nonuniformity of the material and the influence of the negative polarization effects associated with the formation of space charges in the sensitive volume of the detector. They change the electric field distribution in the detector and affect the efficiency of the charge carrier collection. An analysis of the waveforms of the output pulses was used to investigate the uniformity of the charge collection and electric field distribution in the detectors when irradiated by the alpha particles. The influence of infrared (IR) illumination on these parameters was evaluated. IR illumination had no positive effect on the planar detector but greatly improved the charge collection in quasi-hemispherical detectors in the peripheral (corner) regions. The output pulse amplitude increased, and the rise time notably decreased. Polarization that occurred predominantly in the corner regions at low temperatures (from −30 °C to −20 °C) was eliminated using IR illumination.