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Your search keyword '"Zur, I. A."' showing total 18 results
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18 results on '"Zur, I. A."'

6. Effect of the thickness on electrical resistance of thin diamond-like carbon coatings on silicon substrate

Author

null Movchan S. A., null Kharchanka A. A., null Fedotova J. A., null Shmanay Y. E., and null Zur I. A.

Abstract

The relationship between sp2/sp3-hybridizations ratio of atomic bonds in diamond-like carbon ( DLC --- Diamond-Like Carbon) and its electrical resistivity for coatings with a thickness in the range 22-70 nm prepared by vacuum arc deposition on silicon substrate of the KDB-8 brand has been established. It is established, that an increase in the coating thickness from 22 to 70 nm is accompanied by a decrease in the specific transverse electrical resistance of samples from 17 to 2 GΩ·m. This effect is explained by an increase in the proportion of carbon atoms with sp2-hybridization of electronic orbitals from 86 to 91%, which leads to the appearance of an additional number of π-bonds. A mathematical model, describing the spatial distribution of current when measuring transverse I-V characteristic, has been developed. The results obtained will be useful in creating resistive layers on the electrodes of gas-discharge detectors of charged particle to limit the amount of current in the event of rare spark discharges inside them caused by the registration of random highly ionizing particles. Keywords: ( DLC), electrical properties of thin films, hybridization of electronic orbitals, Raman scattering, I-V characteristic.

Published
2023

7. Processes Induced in DLC/Polyimide Structures by Irradiation with 60Co γ-Rays.

Author

Kharchenko, A. A., Fedotova, Yu. A., Zur, I. A., Brinkevich, D. I., Brinkevich, S. D., Grinyuk, E. V., Prosolovich, V. S., Movchan, S. A., Remnev, G. E., Linnik, S. A., and Lastovskii, S. B.

Subjects
IRRADIATION, VIBRATIONAL spectra, POLYIMIDE films, GROUP formation, POLYIMIDES, ABSORPTION spectra
Abstract

The DLC/Kapton structures irradiated with 60Co γ-rays at doses to 1 MGy have been studied by measuring transmission and attenuated total reflection (ATR) spectra. It has been shown that there are significant changes in the spectra in the ranges of vibrations of О–Н, CH2, and CH3 bonds due to radiation-induced processes in the byproducts of polyimide synthesis and residual solvents. Significant differences were found in the radiation-induced processes occurring in the bulk and near-surface region of a polyimide film and DLC/polyimide structures. After irradiation, the bulk of polyimide exhibited bands due to asymmetric and symmetric vibrations of the CH3 group. Bands associated with the vibrations of the CH2 group were additionally observed in the near-surface region. The formation of CH2 groups in the near-surface layer under irradiation was more pronounced in DLC/polyimide structures than in polyimide films; this was due to the additional supply of hydrogen from the DLC film. [ABSTRACT FROM AUTHOR]

Published
2022
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11. Relationship between Frost Tolerance and Cold-Induced Resistance of Spring Barley, Meadow Fescue and Winter Oilseed Rape to Fungal Pathogens.

Author

Plazek, A., Hura, K., Zur, I., and Niemczyk, E.

Subjects
DISEASE resistance of plants, BARLEY, FESCUE, RAPE (Plant), EFFECT of cold on plants
Abstract

Abstract Plants exposed to one stress factor may become more tolerant to another. Cold is the most often documented factor inducing plant resistance to pathogens. The aim of this work was to investigate whether resistance of spring barley and meadow fescue to Bipolaris sorokiniana and resistance of winter oilseed rape to Phoma lingam induced at 5 °C for 2, 4 or 6 weeks are associated with frost tolerance, water potential and soluble carbohydrate content. Cold-acclimated plants of each species showed increased resistance to the studied pathogens. Barley, fescue and rape plants demonstrated higher frost tolerance after hardening, but only in the case of fescue a correlation between resistance to frost and resistance to B. sorokiniana was found. A significant decrease in the water potential of leaf cells was observed in cold-acclimated barley and fescue. In these two species, water potential greatly affected resistance to B. sorokiniana . However, only in barley did accumulation of fructose, glucose and sucrose correlate as well with changes in water potential as with cold-induced resistance to the pathogen. In the case of hardened rape, no correlation between the studied parameters was found. The results obtained indicated that the temperature of 5 °C used during cold acclimation was not favourable for hardening of this plant species. [ABSTRACT FROM AUTHOR]

Published
2003
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