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

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The Interaction of TOEPyP4 and ZnTOEPyP4 Porphyrins with G-Quadruplexes TOEPyP4和ZnTOEPyP4卟啉与g -四络合物的相互作用
IF 0.4 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2025-07-04 DOI: 10.1134/S1068337225700410
I. V. Vardanyan, M. Kh. Badalyan, Ts. M. Jomardyan, Y. B. Dalyan, S. G. Haroutiunian
{"title":"The Interaction of TOEPyP4 and ZnTOEPyP4 Porphyrins with G-Quadruplexes","authors":"I. V. Vardanyan,&nbsp;M. Kh. Badalyan,&nbsp;Ts. M. Jomardyan,&nbsp;Y. B. Dalyan,&nbsp;S. G. Haroutiunian","doi":"10.1134/S1068337225700410","DOIUrl":"10.1134/S1068337225700410","url":null,"abstract":"<p>The methods of Circular Dichroism and UV/Vis spectrophotometry were used to study the influence of two cationic porphyrins meso-tetra-(4N-oxyethylpyridyl) porphyrin (TOEPyP4) and its Zn-containing derivative (ZnTOEPyP4) on the G-quadruplex conformation of d[5'-A(GGGTTA)<sub>3</sub>GGG-3'] sequence of human telomeric DNA. The analysis of the results indicates a single binding site for these porphyrins, but it differs depending on the porphyrin. It is assumed that TOEPyP4 binds parallel to the quartet plane on the outer surface of the G-quadruplex (external π-π stacking), and the binding of ZnTOEPyP4 also occurs externally, but in the groove of the lateral surface of the G-quadruplex (groove binding).</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"60 1","pages":"115 - 119"},"PeriodicalIF":0.4,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161398","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
Modeling and Experimental Study of Black Silicon Angular Reflection 黑硅角反射的建模与实验研究
IF 0.4 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2025-07-04 DOI: 10.1134/S106833722570029X
G. Y. Ayvazyan, M. V. Katkov, L. M. Lakhoyan
{"title":"Modeling and Experimental Study of Black Silicon Angular Reflection","authors":"G. Y. Ayvazyan,&nbsp;M. V. Katkov,&nbsp;L. M. Lakhoyan","doi":"10.1134/S106833722570029X","DOIUrl":"10.1134/S106833722570029X","url":null,"abstract":"<p>We present the results of angular reflection analysis of black silicon (b-Si) layers formed by reactive ion etching. Calculations using the transfer matrix method and experimental measurements confirm the excellent antireflective properties of b-Si at light incidence angles of up to 60°. This ensures the stability of the short-circuit current in solar cells across a wide angular range, which is particularly important for the efficient operation of stationary photovoltaic stations during daytime and under cloudy conditions.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"60 1","pages":"83 - 88"},"PeriodicalIF":0.4,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161408","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
Spin-Dependent Multichannel Tunneling of an Electron in a Nanotube with an Impurity in a Longitudinal Magnetic Field 纵向磁场中含杂质纳米管中电子的自旋相关多通道隧穿
IF 0.4 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2025-07-04 DOI: 10.1134/S1068337225700306
D. A. Badalyan, A. Zh. Muradyan
{"title":"Spin-Dependent Multichannel Tunneling of an Electron in a Nanotube with an Impurity in a Longitudinal Magnetic Field","authors":"D. A. Badalyan,&nbsp;A. Zh. Muradyan","doi":"10.1134/S1068337225700306","DOIUrl":"10.1134/S1068337225700306","url":null,"abstract":"<p>Multichannel quantum tunneling of an electron through a potential barrier of a thin impurity introduced into a nanotube in the presence of a longitudinal magnetic field of arbitrary intensity is investigated. Tunneling and polarization characteristics of the system are studied in detail and illustrated as a function of the electron energy, nanotube radius, and magnetic field induction. It is indicated that in some electron energy ranges the system can operate as an ideal polarizer of the electron flow.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"60 1","pages":"35 - 41"},"PeriodicalIF":0.4,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161892","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
Detailed Spectroscopic and Theoretical Analysis of Yb:LuAG Crystal at Cryogenic and Room Temperatures 低温和室温下Yb:LuAG晶体的详细光谱和理论分析
IF 0.4 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2025-07-04 DOI: 10.1134/S106833722570032X
G. Demirkhanyan, B. Patrizi, G. Toci, P. Muzhikyan, M. Vannini, A. Pirri, M. Margaryan, R. Kostanyan
{"title":"Detailed Spectroscopic and Theoretical Analysis of Yb:LuAG Crystal at Cryogenic and Room Temperatures","authors":"G. Demirkhanyan,&nbsp;B. Patrizi,&nbsp;G. Toci,&nbsp;P. Muzhikyan,&nbsp;M. Vannini,&nbsp;A. Pirri,&nbsp;M. Margaryan,&nbsp;R. Kostanyan","doi":"10.1134/S106833722570032X","DOIUrl":"10.1134/S106833722570032X","url":null,"abstract":"<p>By the analysis of the low-temperature absorption and emission spectra of the crystal 20% Yb<sup>3+</sup>:Lu<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>, the energies of the Stark levels of Yb<sup>3+</sup> ion in dodecahedral positions are determined. Within the framework of the crystal field (CF) theory of point charges (<i>D</i><sub>2</sub> point symmetry group), the CF parameters are determined, and the wave functions of the Stark states are constructed. The line strengths of indirect electric dipole and magnetic dipole inter-Stark transitions are calculated and the Judd–Ofelt parameters are determined. Low temperature absorption and emission spectra show a complex fine structure that cannot be explained on the basis of the standard level structure of Yb<sup>3+</sup> occupying sites with dodecahedral crystal field symmetry.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"60 1","pages":"29 - 34"},"PeriodicalIF":0.4,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161895","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
Human Detection Using an Elliptical Horn Element in the Thermal Infrared Region 利用椭圆角元在热红外区域进行人体检测
IF 0.4 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2025-07-04 DOI: 10.1134/S1068337225700355
A. E. Martirosyan, P. H. Muzhikyan, V. A. Martirosyan, R. B. Kostanyan
{"title":"Human Detection Using an Elliptical Horn Element in the Thermal Infrared Region","authors":"A. E. Martirosyan,&nbsp;P. H. Muzhikyan,&nbsp;V. A. Martirosyan,&nbsp;R. B. Kostanyan","doi":"10.1134/S1068337225700355","DOIUrl":"10.1134/S1068337225700355","url":null,"abstract":"<p>The application of an elliptical horn element for focusing radiation from relatively hot objects in the environment onto a thermal infrared sensor is presented. Theoretical calculations were used to determine the radiation concentration values in the horn element with the normal incidence of rays relative to the entrance section and a single reflection from the inner surface. The device with the horn element and thermal infrared sensor enables the detection of a person at a long distance (16 m) with a wide field of view in the horizontal direction (100°). The setup can operate both independently and in conjunction with other devices that monitor internal and external adjacent spaces.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"60 1","pages":"94 - 100"},"PeriodicalIF":0.4,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161897","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
Study of Excitation Functions of Proton-Induced Reactions on Natural Tin Using Talys 1.96 and Empire 3.2 Codes 利用Talys 1.96和Empire 3.2代码研究天然锡质子诱导反应的激发函数
IF 0.4 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2025-07-04 DOI: 10.1134/S1068337225700379
A. Yu. Petrosyan
{"title":"Study of Excitation Functions of Proton-Induced Reactions on Natural Tin Using Talys 1.96 and Empire 3.2 Codes","authors":"A. Yu. Petrosyan","doi":"10.1134/S1068337225700379","DOIUrl":"10.1134/S1068337225700379","url":null,"abstract":"<p>The excitation functions of proton-induced reactions on natural tin <sup>nat</sup>Sn(<i>p</i>, <i>x</i>)<sup>118m;120m;122;124</sup>Sb and <sup>113;117m</sup>Sn, were investigated using statistical nuclear codes TALYS 1.96 and EMPIRE 3.2. Various models were implemented in these codes for the proton energy range from reaction thresholds to 70 MeV. A comparison of theoretical calculations, utilizing different models of the TALYS 1.96 and EMPIRE 3.2 codes, with experimental data from the EXFOR database was performed. The experimental data were compared with theoretical results through statistical analysis. Weighted statistical parameters of relative deviation were used to assess the differences between experimental and theoretical cross-section values and to evaluate the reliability of the codes. The importance of this study is determined by the practical applications of the <sup>124</sup>Sb, <sup>122</sup>Sb, and <sup>117m</sup>Sn isotopes.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"60 1","pages":"8 - 15"},"PeriodicalIF":0.4,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161900","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
Formation of Diamond Embryos in the Region of Thermodynamic Stability as a Result of Direct Phase Transition Graphite-Diamond of Martensitic Type 马氏体型石墨-金刚石直接相变在热力学稳定区形成金刚石胚
IF 0.4 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2025-07-04 DOI: 10.1134/S1068337225700276
A. N. Avagyan, G. G. Arutyunyan, A. V. Hovsepyan, M. S. Sakanyan, A. K. Kostanyan
{"title":"Formation of Diamond Embryos in the Region of Thermodynamic Stability as a Result of Direct Phase Transition Graphite-Diamond of Martensitic Type","authors":"A. N. Avagyan,&nbsp;G. G. Arutyunyan,&nbsp;A. V. Hovsepyan,&nbsp;M. S. Sakanyan,&nbsp;A. K. Kostanyan","doi":"10.1134/S1068337225700276","DOIUrl":"10.1134/S1068337225700276","url":null,"abstract":"<p>In a stochastic approximation, taking into account the conclusions of the theory of elasticity for micro nonhomogeneous media, a model of diamond nucleation in a high-pressure chamber (HPC) is considered as a result of the direct graphite–diamond phase transition. Considerations are presented regarding the distribution of the number of nuclei <i>N</i> as a function of the intensive parameters pressure <i>P</i> and temperature <i>T</i>. The assumption that the number of grown diamond crystals equals the number of formed diamond nuclei made it possible to use the normal distribution (Gaussian distribution) for analyzing the diamond nucleation processes. As a result, a probabilistic analytical expression for the number of nuclei was obtained, allowing for sufficiently accurate determination of <i>N</i> depending on the measured pressure (<i>P</i><sub>meas</sub>) and temperature (<i>T</i><sub>meas</sub>) values. The rate of diamond nucleation was estimated within the framework of a martensitic-type phase transition model.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"60 1","pages":"71 - 82"},"PeriodicalIF":0.4,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161901","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
Resonance of Electromagnetically Induced Transparency in the Selective Reflection Signal of Atomic Cs Vapor 原子Cs蒸气选择性反射信号中电磁感应透明的共振
IF 0.4 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2025-07-04 DOI: 10.1134/S1068337225700380
A. D. Sargsyan, D. E. Bostanjyan, D. H. Sarkisyan
{"title":"Resonance of Electromagnetically Induced Transparency in the Selective Reflection Signal of Atomic Cs Vapor","authors":"A. D. Sargsyan,&nbsp;D. E. Bostanjyan,&nbsp;D. H. Sarkisyan","doi":"10.1134/S1068337225700380","DOIUrl":"10.1134/S1068337225700380","url":null,"abstract":"<p>The process of electromagnetically induced transparency (EIT) was investigated using two different probe radiations in Cs atomic vapor: in the first case probe radiation– transmission through a nanocell (NC) with the formation of EIT<sub>T</sub>; in the second–selective reflection (SR) of laser radiation from the boundary of the atom-dielectric vapor (dielectric is nanocell window) with the formation of EIT<sub>SR</sub>. To form EIT resonances, we used two continuous narrow-band lasers with λ = 852 nm and a nanocell with an atomic vapor column thickness in the range of 150–1500 nm. A comparison of the formation of EIT resonance in the first and second cases was carried out. Probe radiation containing EIT<sub>T</sub> and EIT<sub>SR</sub>-resonances propagates in opposite directions. It is noted that in a few cases, the formation of EIT resonance is more effective using SR radiation. The splitting of the EIT<sub>SR</sub>-resonance in the longitudinal magnetic field into seven equidistant components was recorded, which allows remote monitoring of the magnetic field.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"60 1","pages":"24 - 28"},"PeriodicalIF":0.4,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161894","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
Light-Induced Abrupt Hydrodynamic Inversion of Molecular Orientation Direction in Liquid Crystals 液晶中分子取向方向的光诱导突变流体动力学反转
IF 0.4 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2025-07-04 DOI: 10.1134/S1068337225700331
V. S. Hakobyan, T. V. Galstian, R. S. Hakobyan
{"title":"Light-Induced Abrupt Hydrodynamic Inversion of Molecular Orientation Direction in Liquid Crystals","authors":"V. S. Hakobyan,&nbsp;T. V. Galstian,&nbsp;R. S. Hakobyan","doi":"10.1134/S1068337225700331","DOIUrl":"10.1134/S1068337225700331","url":null,"abstract":"<p>The problem of laser-induced hydrodynamic reorientation (LIHR) of the director of a hybrid-oriented nematic liquid crystal (NLC) with arbitrary boundary conditions has been numerically solved. LIHR is studied at different laser powers and for two opposite directions of the temperature gradients. The hydrodynamic flow velocity gradient results in a small increase in curvature when light creates a temperature gradient in the out-of-curvature side of the hybrid orientation. The curvature changes sign when light creates a temperature gradient from outside to inside the curvature of the hybrid orientation. The dependence of reorientation on the anchoring energy of molecules to the boundaries is also investigated.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"60 1","pages":"50 - 55"},"PeriodicalIF":0.4,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161896","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
Coherent Control of a Shallow Impurity Quantum States in Graphene Monolayer by Bichromatic Phase Modulated Laser Pulses: Influence of Relaxation Processes 双色相位调制激光脉冲相干控制石墨烯单层中浅杂质量子态：弛豫过程的影响
IF 0.4 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2025-07-04 DOI: 10.1134/S1068337225700288
A. A. Avetisyan, A. P. Djotyan, G. P. Djotyan, A. L. Vartanian, A. L. Asatryan
{"title":"Coherent Control of a Shallow Impurity Quantum States in Graphene Monolayer by Bichromatic Phase Modulated Laser Pulses: Influence of Relaxation Processes","authors":"A. A. Avetisyan,&nbsp;A. P. Djotyan,&nbsp;G. P. Djotyan,&nbsp;A. L. Vartanian,&nbsp;A. L. Asatryan","doi":"10.1134/S1068337225700288","DOIUrl":"10.1134/S1068337225700288","url":null,"abstract":"<p>The dipole matrix elements for optical transitions 1<i>S</i> –<span>(2{{P}^{ + }})</span> and 2<i>S</i> –<span>(2{{P}^{ + }})</span> of a shallow donor impurity in a graphene monolayer with an opened energy gap are calculated in a perpendicular magnetic field using a variational approach. In the next step, population transfer between the two metastable states 1<i>S</i> and <i>2S</i> by a bichromatic phase modulated (frequency chirped) laser pulse is analyzed taking into account relaxation processes in the system. It is demonstrated that such population transfer may be performed in a robust way without a considerable population of the excited state <span>(2{{P}^{ + }})</span> if the duration of the bichromatic pulse is much shorter than the relaxation times of the system. Spontaneous decay of the excited state and dephasing relaxation processes result in not complete transfer of the population between the metastable states.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"60 1","pages":"42 - 49"},"PeriodicalIF":0.4,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161406","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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