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Double‒Slit X-Ray Dynamical Diffraction in the Transmitted Beam 透射光束中的双缝x射线动态衍射
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/S1068337225700252
A. P. Aivazyan, M. K. Balyan, S. A. Petrosyan, V. P. Mkrtchyan
{"title":"Double‒Slit X-Ray Dynamical Diffraction in the Transmitted Beam","authors":"A. P. Aivazyan,&nbsp;M. K. Balyan,&nbsp;S. A. Petrosyan,&nbsp;V. P. Mkrtchyan","doi":"10.1134/S1068337225700252","DOIUrl":"10.1134/S1068337225700252","url":null,"abstract":"<p>The double-slit dynamical X-ray diffraction in the transmitted beam is investigated. The features and differences are compared with the double-slit dynamical diffraction in the diffracted beam. The expressions for the period of the obtained interference fringes are found. The intensity distributions based on numerical calculations are compared with theoretical predictions based on approximate expressions.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"60 1","pages":"101 - 107"},"PeriodicalIF":0.4,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161399","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 Fluorescent Properties of Methylene Blue Complexes with Ribo- and Deoxyribo-Polynucleotides 含核糖和脱氧核糖多核苷酸的亚甲基蓝配合物的荧光性质研究
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/S1068337225700264
A. P. Antonyan, M. A. Parsadanyan, A. H. Karapetyan, P. O. Vardevanyan
{"title":"Study of Fluorescent Properties of Methylene Blue Complexes with Ribo- and Deoxyribo-Polynucleotides","authors":"A. P. Antonyan,&nbsp;M. A. Parsadanyan,&nbsp;A. H. Karapetyan,&nbsp;P. O. Vardevanyan","doi":"10.1134/S1068337225700264","DOIUrl":"10.1134/S1068337225700264","url":null,"abstract":"<p>A study of the fluorescent properties of MB complexes with ss-poly(dA), poly(rU), poly(rA), and poly(dT), as well as hybrid ds-structures poly(rA)-poly(dT) and poly(dA)-poly(rU), was carried out. Based on changes in fluorescence and absorption spectra, it was revealed that this ligand exhibits unequal affinity for homopolynucleotide sequences. Particularly, it was found that MS binds to poly(rA) with pronounced specificity, compared to ss-poly(dA), poly(rU), and poly(dT). The difference was also obtained for the interaction of MB with hybrid ds-polynucleotides poly(rA)-poly(dT) and poly(dA)-poly(rU).</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"60 1","pages":"108 - 114"},"PeriodicalIF":0.4,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161405","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
Weak Shock Waves in Spherically Symmetric Reactors during Propane Oxidation: Experimental Evidence of the Presence of a Saddle-Type Special Point at the Center of the Reactor 球对称反应器在丙烷氧化过程中的弱激波：在反应器中心存在鞍型特殊点的实验证据
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/S1068337225700392
G. N. Sargsyan
{"title":"Weak Shock Waves in Spherically Symmetric Reactors during Propane Oxidation: Experimental Evidence of the Presence of a Saddle-Type Special Point at the Center of the Reactor","authors":"G. N. Sargsyan","doi":"10.1134/S1068337225700392","DOIUrl":"10.1134/S1068337225700392","url":null,"abstract":"<p>The phase space of low-temperature propane oxidation in a spherical reactor has been investigated in terms of the presence of special points by registering light emission pulses resulting from the generation of weak shock waves in the near-surface layer of the reactor. The phenomenon is explained using the results of the well-known self-similar method to assert that a saddle point forms at the center of the reactor due to the convergence of the weak shock wave towards the reactor’s center. The property of the weak shock wave to reflect off surfaces, as well as from the saddle point, leads to a situation where both the periphery and the center of the reactor reflect the weak shock wave. Under these conditions, closed trajectories typically exist, onto which the trajectory of the shock wave wraps. As a result, it becomes possible to register the radiation of the shock wave occurring in the combustible mixture. Justification is provided for the possibility of experimentally registering weak shock waves in the reactor.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"60 1","pages":"89 - 93"},"PeriodicalIF":0.4,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S1068337225700392.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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
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