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Hierarchical Antireflective Surface of Silicon Substrates for Tandem Solar Cells 用于串联太阳能电池的硅基板分层抗反射表面
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/S1068337223040059
G. Y. Ayvazyan
{"title":"Hierarchical Antireflective Surface of Silicon Substrates for Tandem Solar Cells","authors":"G. Y. Ayvazyan","doi":"10.1134/S1068337223040059","DOIUrl":"10.1134/S1068337223040059","url":null,"abstract":"<p>The structural and optical properties of tandem silicon/perovskite structures with a hierarchical antireflective surface at the interface have been studied. The surface consisted of micro-sized pyramids and nano-sized short needles formed respectively by chemical and reactive ion etching of silicon substrates. It is shown that a perovskite film without pores and voids covers a hierarchical surface with high conformity. The manufactured samples are characterized by low reflectance over a wide range of radiation wavelengths.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"410 - 414"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056038","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
Comparison of Gamma Activation Analysis and Instrumental Neutron Activation Analysis of Geological Samples 地质样品伽马活化分析与仪器中子活化分析的比较
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/S1068337223040023
A. Y. Aleksanyan, S. M. Amirkhanyan, A. G. Aperyan, H. R. Gulkanyan, T. V. Kotanjyan, M. A. Levonyan, V. S. Pogosov, L. A. Poghosyan, A. S. Saakov, A. A. Shahinyan
{"title":"Comparison of Gamma Activation Analysis and Instrumental Neutron Activation Analysis of Geological Samples","authors":"A. Y. Aleksanyan,&nbsp;S. M. Amirkhanyan,&nbsp;A. G. Aperyan,&nbsp;H. R. Gulkanyan,&nbsp;T. V. Kotanjyan,&nbsp;M. A. Levonyan,&nbsp;V. S. Pogosov,&nbsp;L. A. Poghosyan,&nbsp;A. S. Saakov,&nbsp;A. A. Shahinyan","doi":"10.1134/S1068337223040023","DOIUrl":"10.1134/S1068337223040023","url":null,"abstract":"<p>For the first time in Armenia, gamma activation analysis of geological samples of obsidian was carried out using beams of bremsstrahlung photons at the linear electron accelerator of the A. Alikhanyan National Scientific Laboratory (AANL). It is shown that the results of the chemical composition of the obsidian sample are comparable with the results of instrumental neutron activation analysis (INAA) of the same sample, carried out at the Curt-Engelhom-Center for Archaeometry (Mannheim, Germany), after irradiation with neutrons in a specialized nuclear reactor TRIGA at the Institute of Nuclear Chemistry of the Mainz University. It is also shown that gamma activation analysis makes it possible to determine the content of a number of elements for which the use of INAA is impossible or difficult.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"326 - 332"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056130","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
Investigation of Nanostructured Fe2O3:ZnO Sensor by Impedance Spectroscopy 利用阻抗光谱学研究纳米结构的 Fe2O3:ZnO 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 : 2024-03-07 DOI: 10.1134/S1068337223040175
G. H. Shahkhatuni
{"title":"Investigation of Nanostructured Fe2O3:ZnO Sensor by Impedance Spectroscopy","authors":"G. H. Shahkhatuni","doi":"10.1134/S1068337223040175","DOIUrl":"10.1134/S1068337223040175","url":null,"abstract":"<p>A sensor sensitive to hydrogen peroxide vapor based on Fe<sub>2</sub>O<sub>3</sub>:ZnO (80 : 20 wt %) nanostructured film was studied. Investigation of the Fe<sub>2</sub>O<sub>3</sub>:ZnO sensor has been carried out by impedance spectroscopy. Based on the analysis of the frequency dependences of the real and imaginary parts of the complex impedance, the equivalent electrical circuit for the studied sensor structure was proposed, the parameters of its constituent elements were estimated, and approximating curves were computed. Scanning electron microscopy (SEM) images of the Fe<sub>2</sub>O<sub>3</sub>:ZnO film showed a nanoparticle structure. This type of sensor can be used in alternating signal-based detectors for sensing the hydrogen peroxide vapors, at the same time the sensor must be tuned to achieve maximum sensitivity by selecting an appropriate operating frequency range.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"385 - 390"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056257","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
Interaction of Serum Albumin with Erythrosine B under the Influence of Millimeter-Range Electromagnetic Waves 毫米范围电磁波影响下血清白蛋白与赤藓红 B 的相互作用
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/S106833722304014X
M. A. Parsadanyan, M. A. Shahinyan, S. V. Grigoryan, M. S. Mikaelyan, G. H. Poghosyan, V. P. Kalantaryan, P. O. Vardevanyan
{"title":"Interaction of Serum Albumin with Erythrosine B under the Influence of Millimeter-Range Electromagnetic Waves","authors":"M. A. Parsadanyan,&nbsp;M. A. Shahinyan,&nbsp;S. V. Grigoryan,&nbsp;M. S. Mikaelyan,&nbsp;G. H. Poghosyan,&nbsp;V. P. Kalantaryan,&nbsp;P. O. Vardevanyan","doi":"10.1134/S106833722304014X","DOIUrl":"10.1134/S106833722304014X","url":null,"abstract":"<p>The interaction of nutritional preservative and dye erythrosine B with bovine serum albumin (BSA) under the influence of millimeter range electromagnetic waves (MM EMW) with frequencies 41.8 and 51.8 GHz has been studied by the UV-denaturation and spectroscopic methods (absorption, fluorescence, and circular dichroism (CD)). We show that the irradiation by MM EMW with the frequency 51.8 GHz stabilizes the complex BSA-erythrosine B. At the same time, denaturation parameters of the complex at the irradiation of BSA solution with the frequency 41.8 GHz do not differ from those obtained for non-irradiated samples within the limits of experimental error. We also show that under the influence of the irradiation by 51.8 GHz frequency there is no conformational change of BSA. However, a change in the protein conformation takes place in the case of the complex BSA-erythrosine B. In addition, the complex-formation process is thermodynamically beneficial and implemented because of the additional hydrogen bonds and van-der-Waals interaction between BSA and erythrosine B under the influence of MM EMW.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"58 4","pages":"428 - 434"},"PeriodicalIF":0.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140056259","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
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
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