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Journal of Contemporary Physics (Armenian Academy of Sciences)最新文献

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On the Kinetic Theory of Formation and Growth of Synthetic Diamond in the Region of Thermodynamic Stability in Diffusion and Diffusion-Less Approximation 论扩散和无扩散近似热力学稳定区人造金刚石形成和生长的动力学理论
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-12-26 DOI: 10.1134/S1068337223030052
A. N. Avagyan, A. V. Hovsepyan, G. G. Harutyunyan, M. S. Sakanyan
{"title":"On the Kinetic Theory of Formation and Growth of Synthetic Diamond in the Region of Thermodynamic Stability in Diffusion and Diffusion-Less Approximation","authors":"A. N. Avagyan,&nbsp;A. V. Hovsepyan,&nbsp;G. G. Harutyunyan,&nbsp;M. S. Sakanyan","doi":"10.1134/S1068337223030052","DOIUrl":"10.1134/S1068337223030052","url":null,"abstract":"<p>The results of the ten years of diamond synthesis from graphite in industrial volumes (2 × 10<sup>8</sup> carats) based on the PA “Almaz”, Yerevan, Armenia are analyzed. Theoretical studies are used in the physics of first-order phase transitions. The process of diamond growth is described within the frames of the transition state model using the Fokker-Planck and Zeldovich–Frenkel equations. The formation of a diamond carbon phase nucleus is the result of a direct graphite-diamond phase transition under high pressures and temperatures.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 3","pages":"224 - 237"},"PeriodicalIF":0.5,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139054054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Analysis of the Magnetic Characteristics of Single-Domain Ferromagnetic and Superparamagnetic Nanoparticles in a Ni@C Nanocomposite 镍@碳纳米复合材料中单域铁磁性和超顺磁性纳米粒子的磁特性分析
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-12-26 DOI: 10.1134/S1068337223030118
H. T. Gyulasaryan
{"title":"Analysis of the Magnetic Characteristics of Single-Domain Ferromagnetic and Superparamagnetic Nanoparticles in a Ni@C Nanocomposite","authors":"H. T. Gyulasaryan","doi":"10.1134/S1068337223030118","DOIUrl":"10.1134/S1068337223030118","url":null,"abstract":"<p>The magnetic size effects of single-domain nickel nanoparticles encapsulated in a graphite-like carbon shell (Ni@C nanocomposites) have been studied. Along with ferro- and superparamagnetic characteristics, the samples exhibit paramagnetism due to surface nickel ions formed through charge transfer from the carbon matrix. A detailed analysis of the total curves of magnetization <i>M</i>(<i>H</i>) and coercivity at 10 K was carried out and the corresponding magnetic parameters were determined.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 3","pages":"282 - 286"},"PeriodicalIF":0.5,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139053540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Single Crystals of YAlO3:Er for 1.6 μm Spectral Range Lasers 用于 1.6 μm 光谱范围激光器的 YAlO3:Er 单晶体
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-12-26 DOI: 10.1134/S1068337223030088
M. V. Derdzyan, K. L. Hovhannesyan, A. V. Yeganyan, I. Ghambaryan, G. Badalyan, K. N. Gorbachenya, V. E. Kisel, N. V. Kuleshov, A. G. Petrosyan
{"title":"Single Crystals of YAlO3:Er for 1.6 μm Spectral Range Lasers","authors":"M. V. Derdzyan,&nbsp;K. L. Hovhannesyan,&nbsp;A. V. Yeganyan,&nbsp;I. Ghambaryan,&nbsp;G. Badalyan,&nbsp;K. N. Gorbachenya,&nbsp;V. E. Kisel,&nbsp;N. V. Kuleshov,&nbsp;A. G. Petrosyan","doi":"10.1134/S1068337223030088","DOIUrl":"10.1134/S1068337223030088","url":null,"abstract":"<p>Single crystals of YAlO<sub>3</sub>-Er (YAP:Er) are grown by the Bridgman method from melts with different Y/Al ratio. The structural defects and color centers are compared for Y/Al = 1 and Y/Al &gt; 1, as well as formed in the processes of gamma-irradiation and thermal treatment. Based on the obtained data, the growth conditions of YAP:Er crystals free of color centers and twins are determined. Spectral-luminescent properties of crystals are investigated: the absorption and luminescent spectra are registered in the polarized light, the luminescence kinetics is investigated and the lifetime of the <sup>4</sup><i>I</i><sub>13/2</sub> level of Er<sup>3+</sup> ion is determined.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 3","pages":"238 - 244"},"PeriodicalIF":0.5,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139054059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Erratum to: On the Features of Double-Wire Vibrating Wire Monitor 勘误：论双线振动导线监测器的特点
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-12-26 DOI: 10.1134/S1068337223030131
G. V. Mirzoyan, L. Spottek, S. G. Arutunian, A. V. Margaryan, E. G. Lazareva, L. M. Lazarev, G. S. Harutyunyan, A. S. Vardanyan, M. Chung
{"title":"Erratum to: On the Features of Double-Wire Vibrating Wire Monitor","authors":"G. V. Mirzoyan,&nbsp;L. Spottek,&nbsp;S. G. Arutunian,&nbsp;A. V. Margaryan,&nbsp;E. G. Lazareva,&nbsp;L. M. Lazarev,&nbsp;G. S. Harutyunyan,&nbsp;A. S. Vardanyan,&nbsp;M. Chung","doi":"10.1134/S1068337223030131","DOIUrl":"10.1134/S1068337223030131","url":null,"abstract":"","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 3","pages":"320 - 320"},"PeriodicalIF":0.5,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139054018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Capacitive Immunosensors Based on Structures Electrolyte-Insulator-Semiconductor 基于电解质-绝缘体-半导体结构的电容式免疫传感器
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-12-26 DOI: 10.1134/S106833722303009X
F. V. Gasparyan, V. V. Simonyan, L. F. Gasparyan
{"title":"Capacitive Immunosensors Based on Structures Electrolyte-Insulator-Semiconductor","authors":"F. V. Gasparyan,&nbsp;V. V. Simonyan,&nbsp;L. F. Gasparyan","doi":"10.1134/S106833722303009X","DOIUrl":"10.1134/S106833722303009X","url":null,"abstract":"<p>The results of modeling the electrophysical characteristics of reusable capacitive immunosensors based on the electrolyte-insulator-semiconductor (EIS) structure are presented. Electrophysical and geometrical data on the most common viruses are collected and classified from a unified point of view. The results of theoretical computations of the capacitance and capacitive sensitivity of multiple-use EIS immunosensors for COVID-19 viruses are presented and analyzed.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 3","pages":"257 - 265"},"PeriodicalIF":0.5,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139053585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Conditionally Exactly Solvable 1D Dirac Pseudoscalar Interaction Potential 有条件精确求解的一维狄拉克伪谱相互作用势能
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-12-26 DOI: 10.1134/S1068337223030106
A. M. Ghazaryan, A. M. Ishkhanyan, V. M. Red’kov
{"title":"A Conditionally Exactly Solvable 1D Dirac Pseudoscalar Interaction Potential","authors":"A. M. Ghazaryan,&nbsp;A. M. Ishkhanyan,&nbsp;V. M. Red’kov","doi":"10.1134/S1068337223030106","DOIUrl":"10.1134/S1068337223030106","url":null,"abstract":"<p>We study an analytically solvable pseudoscalar interaction potential for the one-dimensional stationary Dirac equation, which consists of power terms proportional to <span>({{x}^{{ - 1}}})</span>, <span>({{x}^{{ - 1/3}}})</span>, and <span>({{x}^{{1/3}}})</span>. This potential is classified as conditionally exactly solvable due to the fixed strength of the first term at a specific constant. We present the general solution to the Dirac equation in terms of non-integer index Hermite functions, which are distinct from the conventional integer index Hermite polynomials. We analyze the energy spectrum of the bound states and the eigenfunctions and compare the results with the case without the <span>({{x}^{{ - 1/3}}})</span> term.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 3","pages":"212 - 219"},"PeriodicalIF":0.5,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139053957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Validation of 3D Depletion Model of the Parcs–Paths Program for WWER-440 Type Reactors 为 WWER-440 型反应堆验证 Parcs-Paths 程序的三维损耗模型
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-12-26 DOI: 10.1134/S1068337223030179
A. Ugujyan
{"title":"Validation of 3D Depletion Model of the Parcs–Paths Program for WWER-440 Type Reactors","authors":"A. Ugujyan","doi":"10.1134/S1068337223030179","DOIUrl":"10.1134/S1068337223030179","url":null,"abstract":"<p>Within the framework of a three-dimensional model, the burnup process of the core of the WWER-440 reactor was studied using measurements of the operating cycles of the Armenian NPP (ANPP). Simulation results showed that a model study that takes into account only the temperature dependence of the thermal conductivity of the PATHS (PARCS Advanced Thermal Hydraulic Solver) fuel leads to discrepancies with the measured values of the boron concentration as the cycle time increases. However, taking into account the dependence of thermal conductivity on burnup significantly improved the agreement between the results of PARCS–PATHS (Purdue Advanced Reactor Core Simulator) and measurements. Taking into account the heat transfer of the fuel rod gap further improved the agreement between the simulation and measurement results. For the non-peripheral fuel assemblies, the relative difference between the predicted PARCS–PATHS and measured thermocouple results meet the acceptance criteria (≤10%). For peripheral assemblies that are in contact with the reflector by three faces, the relative error exceeds the acceptance criteria (15%) by 1–2%.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 3","pages":"205 - 211"},"PeriodicalIF":0.5,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139053531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Possibility of a Point Explosion due to the Presence of UV Radiation and Mercury Vapor in the Reaction Medium for Oxidation of Organic Compounds on the Example of Propane 以丙烷为例，有机化合物氧化反应介质中存在紫外线辐射和汞蒸气导致点状爆炸的可能性
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-12-26 DOI: 10.1134/S1068337223030143
G. N. Sargsyan, M. A. Evinyan, P. S. Ghukasyan, H. P. Sargsyan
{"title":"Possibility of a Point Explosion due to the Presence of UV Radiation and Mercury Vapor in the Reaction Medium for Oxidation of Organic Compounds on the Example of Propane","authors":"G. N. Sargsyan,&nbsp;M. A. Evinyan,&nbsp;P. S. Ghukasyan,&nbsp;H. P. Sargsyan","doi":"10.1134/S1068337223030143","DOIUrl":"10.1134/S1068337223030143","url":null,"abstract":"<p>The influence of external factors on the process of low-temperature propane oxidation in the presence of vacuum ultraviolet (UV) radiation (λ = 100–200 nm) and mercury vapor was studied. The modeling of the process of low-temperature propane oxidation taking into account the above external factors was carried out within the framework of the mathematical theory of a point explosion in gases, which allowed consideration of the possibilities for the formation of shock fronts. For numerical computations, the computer program PTS Mathcad Prime 3.1 was used. The results obtained show the possibility of the formation of shock fronts because of the initiation of the process when the reaction medium is exposed to the vacuum UV radiation and mercury vapor and at a certain symmetry of the reaction vessel. The reflection of thermal radiation of the reaction medium and active particles by mercury atoms (vapors) because of their neutrality and focusing of thermal radiation to the center of the reactor because of the symmetry of the reaction vessel, allows one to apply the theory of thermal development of a chain process and to determine the values of parameters for the point explosion. The phenomenon is explained as the formation of a flame front during initiation in the center of the reaction vessel, and mercury vapor reflects the thermal radiation of the reaction to the center of the vessel. When the amount of energy is sufficient for a point explosion, a shock front is generated.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 3","pages":"245 - 250"},"PeriodicalIF":0.5,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139053539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dependence of the Conductivity Mechanism and Dielectric Properties of Zinc Oxide Films on the Degree of Lithium Doping 氧化锌薄膜的传导机制和介电特性与锂掺杂程度的关系
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-12-26 DOI: 10.1134/S1068337223030039
N. R. Aghamalyan, H. L. Ayvazyan, T. A. Vartanyan, Y. A. Kafadaryan, H. G. Mnatsakanyan, R. K. Hovsepyan, A. R. Poghosyan
{"title":"Dependence of the Conductivity Mechanism and Dielectric Properties of Zinc Oxide Films on the Degree of Lithium Doping","authors":"N. R. Aghamalyan,&nbsp;H. L. Ayvazyan,&nbsp;T. A. Vartanyan,&nbsp;Y. A. Kafadaryan,&nbsp;H. G. Mnatsakanyan,&nbsp;R. K. Hovsepyan,&nbsp;A. R. Poghosyan","doi":"10.1134/S1068337223030039","DOIUrl":"10.1134/S1068337223030039","url":null,"abstract":"<p>The effect of lithium impurity on the dielectric characteristics and the mechanism of conductivity of zinc oxide thin films obtained by the electron beam deposition method was studied. At low frequencies, a strong dispersion of permittivity constants associated with interfacial polarization at grain boundaries was found. It was shown that the frequency dependencies of the conductivity are well described by the Mott theory. It has been established that the mechanism of ac conductivity undergoes qualitative changes with increasing lithium concentration: hopping conductivity is replaced by correlated hops through the barrier and tunneling of small radius polarons. The characteristics of the obtained films indicate the possibility of using them to create a capacitive memory element and a channel of a field-effect transistor.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 3","pages":"274 - 281"},"PeriodicalIF":0.5,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139053587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Synthesis, Investigation and Neural Network Modeling of the Properties of Sol-Gel ITO/ZnO and ITO/ZnO:Mg Structures 溶胶凝胶 ITO/ZnO 和 ITO/ZnO：Mg 结构的合成、特性研究和神经网络建模
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2023-12-26 DOI: 10.1134/S1068337223030064
G. Y. Ayvazyan, K. D. Danilchenko, D. L. Kovalenko, A. A. Maevsky, Yu. V. Nikityuk, V. A. Prokhorenko, A. V. Semchenko, V. V. Sidsky, S. A. Khakhomov, V. V. Malyutina-Bronskaya, A. V. Nesterenok
{"title":"Synthesis, Investigation and Neural Network Modeling of the Properties of Sol-Gel ITO/ZnO and ITO/ZnO:Mg Structures","authors":"G. Y. Ayvazyan,&nbsp;K. D. Danilchenko,&nbsp;D. L. Kovalenko,&nbsp;A. A. Maevsky,&nbsp;Yu. V. Nikityuk,&nbsp;V. A. Prokhorenko,&nbsp;A. V. Semchenko,&nbsp;V. V. Sidsky,&nbsp;S. A. Khakhomov,&nbsp;V. V. Malyutina-Bronskaya,&nbsp;A. V. Nesterenok","doi":"10.1134/S1068337223030064","DOIUrl":"10.1134/S1068337223030064","url":null,"abstract":"<p>The ITO/ZnO and ITO/ZnO:Mg bilayer structures were fabricated by the sol-gel method and their structural and photoelectric properties were experimentally studied. It is shown that, compared with ZnO and ZnO:Mg films without an ITO sublayer, the morphology changes noticeably and the band gap decreases. The <i>I–V</i> characteristics of obtained structures were analyzed in the dark and under the influence of optical radiation of different wavelengths. Using artificial neural networks, their spectral photosensitivity was modeled.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 3","pages":"266 - 273"},"PeriodicalIF":0.5,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139054061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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