2021 жыл

Мақала атауы Авторлар Жыл Журнал атауы Қысқаша аннотация
1 Physical properties of carbon nanowalls synthesized by the ICP-PECVD method vs. the growth time Yerlanuly, Y., Zhumadilov, R., Nemkayeva, R., Uzakbaiuly, B., Beisenbayev, A.R., Bakenov, Z., Ramazanov, T., Gabdullin, M., Ng, A., Brus, V.V., Jumabekov, A.N. 2021 Scientific Reports, Open access, Volume 11, Issue 1, December 2021, Article number 19287, Q1.
Investigation of the physical properties of carbon nanowall (CNW) films is carried out in correlation with the growth time. The structural, electronic, optical and electrical properties of CNW films are investigated using electron microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, ultraviolet photoelectron spectroscopy, UV–Vis spectroscopy, Hall Effect measurement system, Four Point Probing system, and thermoelectric measurements. Shorter growth time results in thinner CNW films with a densely spaced labyrinth structure, while a longer growth time results in thicker CNW films with a petal structure. These changes in morphology further lead to changes in the structural, optical, and electrical properties of the CNW. 
2 Plasma with carbon nanoparticles: Advances and application Orazbayev, S., Yerlanuly, Y., Utegenov, A., Moldabekov, Z., Gabdullin, M., Ramazanov, T. 2021 Nanotechnology, Volume 32, Issue 45,November 5, 2021, Article number 455602, Q1.
This article is devoted to the study of the glow intensity of radio-frequency capacitive discharge plasma with nanoparticles for further use in lighting devices. The process of carbon nanoparticles synthesis in the radiofrequency discharge was investigated, and the influence of plasma parameters on the formation and growth of the material was also studied. A method for determining the diameter of nanoparticles based on self-bias voltage and electron density is considered. It is revealed that the diameter of nanoparticles has a considerable influence on the optical properties of the plasma, in particular, on the emission intensity. Based on the obtained data, laboratory samples of lighting devices with improved luminous intensities were developed. 
3 Morphological characterization of carbon nanowalls networks using Minkowski functionals Yerlanuly, Y., Nemkayeva, R., Zhumadilov, R., Ramazanov, T., Alpysbayeva, B., Gabdullin, M 2021 Japanese Journal of Applied Physics, Volume 60, Issue 11, October 2021, Article number 115001, Q2.
This paper reports the study and description of the morphology of carbon nanowalls (CNWs) based on fractal analysis and Minkowski functionals. CNWs were synthesized by chemical vapor deposition in capacitively-coupled plasma (CCP-PECVD), at various power values of the high-frequency discharge. The synthesized samples were studied using atomic force microscopy and the acquired data were analyzed using the Gwyddion 2.55 program, corresponding fractal analysis was carried out using the height-height correlation function and the power spectral density function, in addition, the Minkowski functional, which provides information on the morphology of the CNWs, was plotted.
4 Ion core effect on scattering processes in dense plasmas Ramazanov, T.S., Kodanova, S.K., Nurusheva, M.M., Issanova, M.K. 2021 Physics of Plasmas, Volume 28, Issue 91, September 2021, Article number 092702, Q2.
A pseudopotential approach was used to study the effect of an ionic core on the electron-ion scattering in dense plasmas. Screening of the ion charge is taken into account using the density response function in the long wavelength limit. Additionally, the effect of electronic non-ideality is included using the compressibilty sum-rule connecting the local field correction and the exchange-correlation part of the electronic free energy density. Using a screened pseudopotential, we have computed electron-ion scattering phase shifts, the total elastic scattering cross section, and the transport cross section. It is found that the ionic core leads to the strong decrease in the scattering cross sections. Additionally, it is shown that the transport cross section has a non-monotonic dependence on the variation of the ionic core field parameters.
5 Hydrogen sorption properties of new magnesium intermetallic compounds with MgSnCu4 type structure Matysina, Z.A., Gavrylyuk, N.A., Kartel, M., Veziroglu, A., Veziroglu, T.N., Pomytkin, A.P., Schur, D.V., Ramazanov, T.S., Gabdullin, M.T., Zolotarenko, A.D., Zolotarenko, A.D., Shvachko, N.A. 2021 International Journal of Hydrogen Energy, Volume 46, Issue 50, Pages 25520 - 25532, July 21, 2021, Q1.
A statistical theory of the MgCeCo4–H2 system has been developed for hydrogenation and phase transitions under pressure. The free energy value is calculated. The equation of thermodynamic equilibrium is obtained. The temperature of the order-disorder phase transition is estimated. Isotherms and Isoplethes of hydrogen absorption-desorption are constructed. The possibility of a hysteresis effect is established. The temperature dependence of the hydrogen solubility is found taking into account the phase transition configuration heat capacity. The calculated and experimental graphs of the sorption isotherm are of a similar nature. 
6 Rotation of dust particles in an inhomogeneous weak magnetic field in a DC glow discharge Abdirakhmanov, A.R., Bastykova, N.K., Kodanova, S.K., Ramazanov, T.S 2021 Physics of Plasmas, Open access, Volume 28,  Issue 7, July 1, 2021, Article number 074503, Q2.
We report an explanation for the opposite direction of the rotation of the charged dust particles above and below the Helmholtz coil in an inhomogeneous weak magnetic field in the direct current glow discharge. Experiments with monodispersed melamine-formaldehyde particles were performed in an argon plasma in an inhomogeneous weak magnetic field (with the induction values 4, 12, and 18 ). The linear and angular velocities of rotational motion of the clusters of dust particles formed in regions with an inhomogeneous weak magnetic field above and below the Helmholtz coil were analyzed. The peculiarity is that the directions of rotation in these areas are opposite, whereas there is no rotational motion in the region of a uniform magnetic field. To explain these observations, the theoretical model that takes into account the magnetic field inhomogeneity and provides good agreement with experimental data is presented. 
7 The study of deuterium permeability of film-forming inhibitors with the addition of fullerenes Akhanova, N., Yerlanuly, Y., Batryshev, D., Kulsartov, T., Chikhray, Y., Ramazanov, T., Veziroglu, A., Schur, D., Kang, W., Gabdullin, M. 2021 International Journal of Hydrogen Energy, Volume 46, Issue 10, Pages 7426 - 7431, February 8, 2021, Q1.
In this work, the results of the hydrogen permeability study of a composite film-forming inhibitor are considered. Film-forming inhibitor consists of polyether urethane and synthesized fullerenes C60 and C70 in pure form. Two types of samples were used: uncoated and coated stainless steels with composite polyether urethane/fullerene varnish. The experimental work was based on the study of the dependence of the permeation reduction factor on the temperature in the reactor. For the coated sample, the minimum temperature was 623 K at which the deuterium flux was registered. Here we assume that at temperatures below 573 K the output pressure caused by the deuterium flow through the sample is less than 10−10 Pa. The rate of steady-state flow through a coated sample is significantly lower than for an uncoated one at temperatures 573–673 K. The deuterium penetration rates through the two samples increase and reach similar stationary values starting at 723 K. 
8 Methods of theoretical calculations and of experimental researches of the system atomic hydrogen – metal Zolotarenko, A.D., Zolotarenko, A.D., Veziroglu, A., Veziroglu, T.N., Shvachko, N.A., Pomytkin, A.P., Schur, D.V., Gavrylyuk, N.A., Ramazanov, T.S., Akhanova, N.Y., Gabdullin, M.T. 2021 International Journal of Hydrogen Energy, Q1.
All the main directions of energy development suggest or already implement the use of hydrogen. In addition, the interaction of low-energy hydrogen atoms with metals is also of considerable interest, both from the point of view of fundamental research and in connection with the operation of large tokamaks and thermonuclear reactors. The paper presents a literature review of the features of the interaction of hydrogen with metals. It is shown that metal-hydrogen reactions, which lead to the formation of metal hydrides, are considered as a special type of such interaction. Modern methods of experimental study of heterogeneous reactions, topochemistry of metal - hydrogen reactions, dependences of the rate of interaction on pressure and temperature are considered, models of surface processes occurring during the interaction of hydrogen with a metal are discussed. A kinetic method for studying the mechanism of interaction of atomic hydrogen with hydride-forming metals is proposed.
9 The use of ultrapure molecular hydrogen enriched with atomic hydrogen in apparatuses of artificial lung ventilation in the fight against virus COVID-19 Zolotarenko, A.D., Zolotarenko, A.D., Veziroglu, A., Veziroglu, T.N., Shvachko, N.A., Pomytkin, A.P., Gavrylyuk, N.A., Schur, D.V., Ramazanov, T.S., Gabdullin, M.T 2021 International Journal of Hydrogen Energy, Q1.
COVID-19 is a disease caused by the SARS-CoV virus. It stands for severe acute respiratory syndrome, which affects the lungs. The process of replication and progression of the COVID-19 virus causes the formation of an excessive amount of reactive oxygen species and inflammation. Many studies have been carried out that have demonstrated that hydrogen has strong anti-inflammatory properties. It reduces hypotension and other symptoms by reducing inflammation and oxidative stress. Oxygen mixture, enriched with Hydrogen, - helps to reduce the resistance of the respiratory tract and frees up access to the pulmonary alveolus, which improves the penetration of oxygen into the lungs. Since hydrogen is an antioxidant, it helps to reduce the burden on the immune system, helps to maintain the body's health and its ability to quickly recover. When electrolysers are used to produce an oxygen-hydrogen mixture, alkaline mist and other impurities can enter the patient's lungs and cause poisoning and chemical burns. For this reason, the use of atomic hydrogen obtained from metal hydride sources for ventilation of the lungs will be more effective for treating COVID-19 than a molecular hydrogen-oxygen mixture from an electrolyzer. A functional diagram of a metal hydride source of atomic hydrogen to an artificial lung ventilator is shown. It is possible to create a series of hydrogen storage tanks of various capacities.
10 Dust-Acoustic Wave Dispersion in Thermal Dusty Plasmas at Weak and Moderate Couplings Davletov, A., Kurbanov, F., Mukhametkarimov, Y., Yerimbetova, L. 2021 IEEE Transactions on Plasma Science, Volume 49, Issue 6, Pages 2000 - 2007, June 2021, Article number 9439058, Q2.
The dispersion of dust-acoustic waves (DAWs) in weakly and moderately coupled thermal dusty plasmas is studied in the framework of the linear density-response formalism with the static local-field correction for interdust interactions. The plasma medium composition and the charge of dust particles are simultaneously determined within a recently developed chemical model (Physical Review E, vol. 101, 063203, 2020) based on minimizing the Helmholtz free energy of the system under investigation. Stemming from the generalized Poisson-Boltzmann equation, the renormalization procedure is consistently applied to derive an interdust screened potential that takes into account the finiteness of dust grains. Within the framework of the Ornstein-Zernike relationship in the hypernetted chain approximation, the static structure factor of the dust component is evaluated to manifest the appearance of local extrema on its wavenumber dependence, thereby indicating the short-range order formation in the arrangement of dust particles with respect to one another. It is shown that the DAW dispersion law is completely governed by the static structure factor and, therefore, exhibits a nonmonotonic dependence on the wavenumber as well. In the long-wavelength limit, the acoustic-like behavior of the DAW dispersion is strictly confirmed and the corresponding phase speed, reduced in units of the dust thermal velocity, is ultimately expressed via the static structure factor at zero wavenumber.
11 Insights on Desired Fabrication Factors from Modeling Sandwich and Quasi-Interdigitated Back-Contact Perovskite Solar Cells Shalenov, E.O., Dzhumagulova, K.N., Seitkozhanov, Y.S., Ng, A., Valagiannopoulos, C., Jumabekov, A.N. 2021 ACS Applied Energy Materials, Volume 4, Issue 2, Pages 1093 - 1107, February 22, 2021, Q1.
A numerical simulation method is used to investigate the optical and electrical properties of both conventional sandwich and quasi-interdigitated back-contact (QIBC) perovskite solar cells (PSCs). The results reveal the fundamental physics of PSCs with different architectures, exhibiting their difference in working principle and device properties. A two-dimensional optical model, which takes into account both the electromagnetic and electronic properties of various device layers, is selected to accurately describe the device optical properties and to achieve more comprehensive simulations of solar cell properties under different device working conditions. Different carrier recombination mechanisms for two kinds of PSC architectures are also compared. The conditions under which the electrical properties of the perovskite photo-absorber layer enable QIBC PSCs to operate competitively or exhibit better device performance compared to the sandwich PSCs are examined in detail. The case of QIBC PSCs with various combinations of charge-selective layers is analyzed to provide an insight into materials selection for achieving high-efficiency QIBC PSCs. It is found that power conversion efficiencies more than 25% can be potentially achieved for CH3NH3PbI3-based QIBC PSCs after careful optimization of materials selection and device fabrication. The findings of this work can be used as a guideline for the design and fabrication of high-performance QIBC PSCs.
12 Self-bias voltage formation and charged particle dynamics in multi-frequency capacitively coupled plasmas Masheyeva, R.U., Dzhumagulova, K.N., Myrzaly, M., Schulze, J., Donkó, Z. 2021 AIP Advances, Open access, Volume 11, Issue 7, July 1, 2021, Article number 075024, Q2.
In this work, we analyze the creation of the discharge asymmetry and the concomitant formation of the DC self-bias voltage in capacitively coupled radio frequency plasmas driven by multi-frequency waveforms as a function of the electrode surface characteristics. For the latter, we consider and vary the coefficients that characterize the elastic reflection of electrons from the surfaces and the ion-induced secondary electron yield. Our investigations are based on particle-in-cell/Monte Carlo collision simulations of the plasma and on a model that aids the understanding of the computational results. Electron reflection from the electrodes is found to slightly affect the discharge asymmetry in the presence of multi-frequency excitation, whereas secondary electrons cause distinct changes to the asymmetry of the plasma as a function of the phase angle between the harmonics of the driving voltage waveform and as a function the number of these harmonics.
13 Axial-symmetric diffraction radiation antenna with a very narrow funnel-shaped directional diagram Sirenko, Y., Sautbekov, S., Sautbekova, M., Yashina, N., Burambayeva, N., Begimova, A 2021 Applied Sciences (Switzerland), Open access, Volume 11,  Issue 21, Nov-1 2021, Article number 10381, Q2.
The paper is focused on reliable modeling and analysis of axially symmetric radiators with a very narrow (throat) funnel-shaped radiation pattern. When such a diagram is formed, a wave analogue of Smith–Purcell coherent radiation is realized—the surface wave of a radial dielectric waveguide ‘sweeps out’ with its exponentially decaying part a concentric periodic grating, the fundamental spatial harmonic of which, propagating without attenuation in a direction close to the symmetry axis of the structure, generates a radiation field with the required characteristics.
14 Analogy approach in solving the problem of a moving electric dipole Sautbekov, S.S., Baisalova, K.N., Sirenko, Y.K. 2021 AIP Advances, Open access, Volume 11, Issue 10, Pages 1ENG, October 1, 2021 Article number 105012, Q2.
Using the principle of permutational duality as well as the analogical approach of both electrical and magnetic dipoles, it is possible to obtain a new relativistic magnetic type vector potential of an arbitrarily moving electric point dipole. The specific cases of the magnetic vector potential in the calculation of fields have been considered, and the obtained results have been compared with the research of other scholars.
15 The evaluation of an asymptotic solution to the sommerfeld radiation problem using an efficient method for the calculation of sommerfeld integrals in the spectral domain Bourgiotis, S., Frangos, P., Sautbekov, S., Pshikov, M. 2021 Electronics (Switzerland), Open access, Volume 10, Issue 111, June 2021, Article number 1339, Q2.
A recently developed high-frequency asymptotic solution for the famous “Sommerfeld radiation problem” is revisited. The solution is based on an analysis performed in the spectral domain, through which a compact asymptotic formula describes the behavior of the EM field, which emanates from a vertical Hertzian radiating dipole, located above flat, lossy ground. The paper is divided into two parts. We first demonstrate an efficient technique for the accurate numerical calculation of the well-known Sommerfeld integrals. The results are compared against alternative calculation approaches and validated with the corresponding Norton figures for the surface wave. In the second part, we introduce the asymptotic solution and investigate its performance; we compare the solution with the accurate numerical evaluation for the received EM field and with a more basic asymptotic solution to the given problem, obtained via the application of the Stationary Phase Method. Simulations for various frequencies, distances, altitudes, and ground characteristics are illustrated and inferences for the applicability of the solution are made. Finally, special cases leading to analytical field expressions close as well as far from the interface are examined.
16 Plasma Diagnostics on Pulse Plasma-Focus Generators and Their Features as Alternative Fusion Reactors Zhukeshov, A.M., Moldabekov, Z.M., Ibraev, B.M., Amrenova, A.U., Gabdullina, A.T. 2021 Fusion Science and Technology, Volume 77, Issue 5, Pages 359 - 3652021, Q2.
This paper is devoted to discussing the technical characteristics of pulsed plasma-focus (PF) generators and their features as fusion reactors as an alternative for stationary thermonuclear installations. First, the authors present results of experimental data obtained on the Pulse Plasma Accelerator–30 (PPA-30) and dense PF-4 devices. The pulse discharge current and jumped parameters and the energy distribution along and across the axis on the 31-kJ (at 30 kV and 69 μF) PPA-30 device were determined. It is indicated that plasma already is completely ionized at the kilo-ampere range and its inductance is small. The maximum energy density of the plasma was equal to 230 J/cm2 and a macrofocusing effect was observed. Second, the emission parameters of the PF-4 device were determinate. The neutron yield was equal to about 107 imp/shot. The variation of the axial and radial neutron yield was observed. Further, the problems of neutron yield on PF devices and options for the development of a fusion reactor taking into account other technical capabilities of PF are discussed. It is proposed to develop the design of PF in such a way as to take into account the peculiarities of the interaction of particles with an electric and magnetic field. In this situation, the important indicator is not the temperature of the plasma, but the geometry of the electrode system to provide a directed flow of particles.
17 An Al and Cu layers with microporous deposited using pulsed arc spraying Zhukeshov, A.M., Fermakhan, K., Gabdullina, A.T., Useinov, B.M. 2021 Material Letters, Volume 2981, September 2021, Article number 130028, Q1.
The pulsed vacuum arc plasma have been using as media for spraying of copper and aluminum cathodes. The product of cathode erosion was deposited on the substrates made from crystalline silicon and stainless steel. A porous metal thick layers on the silicon substrate, that consist of spherical hollow particles were obtained. The continuous growing films and large particles on the metal surface as well as a number of cavities on the silicon surface were observed. The process of larger micron-sized particles formed from hundreds of nanoscale ones was observed. The difference of layer structure on surfaces can be explain that a morphology of the original surface affects the size of the deposited particles. The role of cathode drops and buffer plasma in deposition process discussed.
18 A New Passive Lossless Snubber Dzhunusbekov, E., Orazbayev, S. 2021 IEEE Transactions on Power Electronics, Volume 36, Issue 8, Pages 9263 - 9272, August 2021,  Article number 9345462, Q2.
Galvanically isolated photovoltaic (PV) microinverters based on single-stage flyback topology have advantages: simplicity, better reliability, and low cost. But isolated flyback topology comes with voltage stresses on semiconductor switches caused by transformer leakage inductance. An improved regenerative snubber has been proposed to meet the ever-growing demand for higher efficiency of PV microinverters. The proposed topology is the inductor-capacitor-diode (LCD) snubber with flying capacitor modified to reduce circulating currents. Theoretical analysis reveals a number of advantages. Experimental results are presented to verify the performance.