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

{"title":"Erratum to: On the Features of Double-Wire Vibrating Wire Monitor","authors":"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","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}

{"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}

{"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}

{"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}

{"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}

{"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}

{"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}

{"title":"Paramagnetism of Surface Ni Atoms in Ni@C Nanocomposites. “Anomalous” Magnetic Size Effects in Ultrasmall Ni Particles: Manifestations of Surface Magnetic Anisotropy in Squid Magnetometry and FMR Spectra","authors":"E. G. Sharoyan,&nbsp;H. T. Gyulasaryan,&nbsp;A. S. Manukyan","doi":"10.1134/S1068337223030155","DOIUrl":"10.1134/S1068337223030155","url":null,"abstract":"<p>The dimensional magnetic effects of single-domain Ni nanoparticles encapsulated by a carbon shell (Ni@C nanocomposites) have been studied. The studied samples were obtained by solid-phase pyrolysis of solid solutions of nickel phthalocyanine (NiPc) and metal-free phthalocyanine (H₂Pc): (NiPc)_<i>x</i>(H₂Pc)_{1 – <i>x</i>}, where 0 ⩽ <i>x</i> ⩽ 1. The Ni concentration in the carbon matrix varied in the range of 0–12 wt %, the sizes of the average diameter of nanoparticles in different samples were from 4 to 40 nm. The paramagnetism of the surface and near-surface atoms of Ni nanoparticles, which is due to the charge transfer from the carbon matrix with the formation of Ni ions has been studied in detail. A method for determining the blocking temperature of superparamagnets in temperature measurements of the paramagnetic susceptibility in the case of high magnetic fields is considered. The magnetic characteristics, which reflect size effects in SQUID magnetometry and FMR, exhibit “anomalous” deviations in the range of ultrasmall particles. These are high values of the blocking temperature, high values of the coercive force, and the ferromagnetic resonance linewidth, as well as a significant shift of the effective g-factor in the FMR spectra. Generalizing equations are presented that include the contributions of the surface magnetic anisotropy along with the bulk magnetocrystalline anisotropy, which is consistent with the experimental results over the entire investigated range from 4  to 40 nm. It is shown that the parameters of the total magnetic resonance spectra (FMR + ESR) are caused by the ferromagnetism of the core of nickel nanoparticles and the paramagnetism of surface and near-surface Ni ions, as well as π-electrons of the organic matrix. A general diagram of the dependence of the coercive force on particle sizes for temperatures lower than the blocking temperature (<i>T</i> &lt; <i>T</i>_b) is also presented.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 3","pages":"287 - 298"},"PeriodicalIF":0.5,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139053484","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}

{"title":"Preparation of the Ferromagnetic Intermetallic Compound Ni3Fe by Solution Combustion Synthesis","authors":"N. H. Amirkhanyan,&nbsp;Y. G. Grigoryan,&nbsp;M. K. Zakaryan,&nbsp;A. S. Kharatyan,&nbsp;H. T. Gyulasaryan,&nbsp;A. B. Harutyunyan","doi":"10.1134/S1068337223030040","DOIUrl":"10.1134/S1068337223030040","url":null,"abstract":"<p>The intermetallic compound Ni₃Fe was obtained using the solution combustion synthesis (SCS) method, based on heating an aqueous solution containing nitrates of the corresponding metals and hexamethylenetetramine (HMTA) in a nitrogen atmosphere. The limits for the implementation of a self-propagating reaction in the metal nitrates-HMTA system were determined depending on the amount of HMTA in the reacting mixture (<i>n</i>). It has been established that by changing the value of <i>n</i> it is possible to control phase composition and microstructure of the obtained SCS products. The X-ray examinations have shown that at <i>n</i> = 6, a single-phase target product Ni₃Fe is obtained, and electron microscopic studies indicated that the product is characterized by a pronounced porous structure because of abundant gas evolution during the SCS process. Based on thermogravimetric analyses of the individual compounds and the mixture of reagents (iron and nickel nitrates with HMTA), a possible mechanism for forming the target Ni₃Fe intermetallic compound is discussed. The magnetic characteristics of the synthesized substance have been studied.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 3","pages":"299 - 304"},"PeriodicalIF":0.5,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139053530","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}

{"title":"Electromagnetic Vector Monochromatic Diffraction Fields and Fields of Charges in Media","authors":"M. K. Balyan","doi":"10.1134/S1068337223030076","DOIUrl":"10.1134/S1068337223030076","url":null,"abstract":"<p>Monochromatic electromagnetic fields are considered inside an arbitrarily chosen volume both in homogeneous and inhomogeneous media. Formulas for the fields in the selected volume are obtained using the vector Green’s function of the medium. Two forms of the vector Green’s function are found for homogeneous media. The Kirchhoff and Kirchhoff–Kottler vector formulas for the problem of diffraction by an aperture in an opaque screen are obtained. Because of the use of the vector Green’s function, the Kirchhoff–Kottler formula is obtained directly, without using additional assumptions.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 3","pages":"251 - 256"},"PeriodicalIF":0.5,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139053583","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}