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Absorption of Hypersonic Waves in Doped Lithium Niobate Single Crystals 掺杂铌酸锂单晶体对高超音速波的吸收
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-03-07 DOI: 10.1134/S1068337223040199
A. V. Yeganyan, N. E. Kokanyan, E. P. Kokanyan
{"title":"Absorption of Hypersonic Waves in Doped Lithium Niobate Single Crystals","authors":"A. V. Yeganyan,&nbsp;N. E. Kokanyan,&nbsp;E. P. Kokanyan","doi":"10.1134/S1068337223040199","DOIUrl":"10.1134/S1068337223040199","url":null,"abstract":"<p>Within the frameworks of the defect isotopic model, new expressions for the rapid estimation of the absorption coefficients of longitudinal and transverse hypersonic waves in the alloyed lithium niobate single crystals in the Akhiezer regime have been obtained. It is shown that the introduction of impurities in the crystal results in a change in both the magnitude of the sound attenuation coefficient and its temperature dependence.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"375 - 377"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056026","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
Vector Non-Stationary Electromagnetic Diffraction Fields and Fields of Charges in Media 矢量非静止电磁衍射场和介质中的电荷场
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-03-07 DOI: 10.1134/S1068337223040072
M. K. Balyan
{"title":"Vector Non-Stationary Electromagnetic Diffraction Fields and Fields of Charges in Media","authors":"M. K. Balyan","doi":"10.1134/S1068337223040072","DOIUrl":"10.1134/S1068337223040072","url":null,"abstract":"<p>Vector non-stationary diffraction electromagnetic fields and fields of charges in an arbitrarily chosen volume in both homogeneous and inhomogeneous media are considered. These formulas are presented in two forms, each of which has its advantages in applications. The generalization of the Kirchhoff–Kottler vector formulas for discontinuous fields in the non-stationary case is also directly obtained.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"349 - 354"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056253","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
Bandwidth Increase and Isolation Improvement of Elements in Miniaturized Phased Antenna Array 小型化相控天线阵列中元件带宽的增加和隔离度的改善
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/S1068337223030167
A. H. Stepanyan
{"title":"Bandwidth Increase and Isolation Improvement of Elements in Miniaturized Phased Antenna Array","authors":"A. H. Stepanyan","doi":"10.1134/S1068337223030167","DOIUrl":"10.1134/S1068337223030167","url":null,"abstract":"<p>Th<b>e</b> electrically small phased antenna array is investigated. High permittivity dielectric and magnetodielectric materials (MDM) are used for antenna array substrates to miniaturize antenna size. To analyze material parameter influence on antenna performance, the same refractive index is considered for dielectric and MDM. The basic parameters of high permittivity-based, and MDM-based microstrip patch antenna arrays are compared. The simulation results show that the usage of MDM results in the improvement in bandwidth and isolation between elements, perfect impedance matching (voltage standing wave ratio (VSWR) &lt; <span>(~1.1)</span> for center frequency) between material and free space over a much wider bandwidth.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 3","pages":"314 - 319"},"PeriodicalIF":0.5,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139053490","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
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
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