发布求助
文献互助 智能选刊 最新文献

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

筛选
英文 中文
Influence of Noise Distortions of the Spectral Phase on the Profile of an Ultrashort Pulse 频谱相位噪声失真对超短脉冲轮廓的影响
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-11-18 DOI: 10.1134/S1068337224700208
V. Avetisyan, M. Sukiasyan, A. Avetisyan, A. Kirakosyan, A. Kutuzyan
{"title":"Influence of Noise Distortions of the Spectral Phase on the Profile of an Ultrashort Pulse","authors":"V. Avetisyan,&nbsp;M. Sukiasyan,&nbsp;A. Avetisyan,&nbsp;A. Kirakosyan,&nbsp;A. Kutuzyan","doi":"10.1134/S1068337224700208","DOIUrl":"10.1134/S1068337224700208","url":null,"abstract":"<p>Based on numerical and experimental studies, an analysis of the influence of the noise component in determining the spectral phase of an ultrashort pulse in the problems of reconstructing the pulse profile was carried out. Additive white noise was considered and it was shown that the error in field reconstruction becomes proportional to the product of the spectral amplitude and the error in determining the spectral phase at small values of the latter. The results obtained are applied to the technique of determining the spectral phase based on the dispersion Fourier transform. The high accuracy of the method and the possibility of its use as an effective technique were discussed. The spectral phases of double-peak pulses formed from a 120 fs laser pulse with a known spectral phase were experimentally determined, and the error in determining the spectral phase and reconstructing the pulse field was assessed.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 2","pages":"149 - 153"},"PeriodicalIF":0.5,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672692","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
Stationary States of an Electron in a Prolate Spheroidal Quantum Dot Prolate Spheroidal 量子点中电子的静止状态
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-11-18 DOI: 10.1134/S1068337224700269
M. V. Hayrapetyan, A. Zh. Muradyan
{"title":"Stationary States of an Electron in a Prolate Spheroidal Quantum Dot","authors":"M. V. Hayrapetyan,&nbsp;A. Zh. Muradyan","doi":"10.1134/S1068337224700269","DOIUrl":"10.1134/S1068337224700269","url":null,"abstract":"<p>The stationary states of an electron in a nanosized semiconductor quantum dot of spheroidal shape with a deep confining potential are considered. The discrete energy spectrum and corresponding wave functions are very sensitive to the elongation, especially in the region of high eccentricity values. The main attention is paid to identifying the patterns of the radial-angular distribution of electron wave functions, which should play an important role in the angular distribution of photons emitted by the quantum dot.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 2","pages":"144 - 148"},"PeriodicalIF":0.5,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672690","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
Thermodynamic Parameters of Binding of Small Molecules to DNA Irradiated by Low-Intensity Millimeter Electromagnetic Waves 小分子与低强度毫米电磁波辐照 DNA 结合的热力学参数
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-11-18 DOI: 10.1134/S1068337224700270
V. P. Kalantaryan, R. S. Ghazaryan, Yu. S. Babayan
{"title":"Thermodynamic Parameters of Binding of Small Molecules to DNA Irradiated by Low-Intensity Millimeter Electromagnetic Waves","authors":"V. P. Kalantaryan,&nbsp;R. S. Ghazaryan,&nbsp;Yu. S. Babayan","doi":"10.1134/S1068337224700270","DOIUrl":"10.1134/S1068337224700270","url":null,"abstract":"<p>The interaction of biologically active molecules (BAM) with the biopolymer DNA, which performs the most important functions in a living organism having a double helical structure, irradiated with non-thermal electromagnetic millimeter waves, has been studied. It has been shown, that BAM (doxorubicin, mitoxantrone, and netropsin) form more stable complexes with DNA irradiated with the resonant frequencies of natural vibrations of the molecular structures of water (64.5 and 50.3 GHz). Under the influence of the above non-thermal millimeter waves, dehydration of the DNA molecule occurs, which leads to an increase in the binding constant of BAM to irradiated DNA. Calculations show that as a result of irradiation, the thermodynamic parameters of the binding of BAM to DNA change-enthalpy (Δ<i>H</i>) and entropy (Δ<i>S</i>): For all studied BAM, Δ<i>H</i> &lt; 0, and Δ<i>S</i> &gt; 0. The greatest change in entropy occurs for netropsin that binds externally to DNA.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 2","pages":"228 - 232"},"PeriodicalIF":0.5,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672576","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
Thermodynamics of an Ideal Electron Gas Localized in a Thin Spherical CdSe Nanolayer 薄球形硒化镉纳米层中局部理想电子气的热力学
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-11-18 DOI: 10.1134/S1068337224700312
L. A. Tadevosyan, V. A. Stepanyan, H. T. Ghaltaghchyan, E. S. Mamasakhlisov, H. A. Sarkisyan
{"title":"Thermodynamics of an Ideal Electron Gas Localized in a Thin Spherical CdSe Nanolayer","authors":"L. A. Tadevosyan,&nbsp;V. A. Stepanyan,&nbsp;H. T. Ghaltaghchyan,&nbsp;E. S. Mamasakhlisov,&nbsp;H. A. Sarkisyan","doi":"10.1134/S1068337224700312","DOIUrl":"10.1134/S1068337224700312","url":null,"abstract":"<p>The thermodynamic characteristics of an electron gas localized in a thin spherical CdSe nanolayer have been studied. The dimensions of the CdTe/CdSe core-shell type quantum dot are considered large, which allows the gas to be considered ideal. Due to the small thickness, the particle spectrum has a subband character, when a family of levels of the spherical rotator is associated with each radial quantization level. Within the framework of Boltzmann statistics, the statistical sum for the gas under study was determined, as well as the mean energy, entropy, and heat capacity. The dependences of the thermodynamic characteristics of the electron gas on the geometric parameters of a CdTe/CdSe quantum dot have been studied.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 2","pages":"172 - 178"},"PeriodicalIF":0.5,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672584","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
Influence of Self-Focused Elliptical Laser Beam on Second Harmonic Generation in Cold Quantum Plasma 自聚焦椭圆激光束对冷量子等离子体中二次谐波产生的影响
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-11-18 DOI: 10.1134/S1068337224700300
K. Singh, K. Walia
{"title":"Influence of Self-Focused Elliptical Laser Beam on Second Harmonic Generation in Cold Quantum Plasma","authors":"K. Singh,&nbsp;K. Walia","doi":"10.1134/S1068337224700300","DOIUrl":"10.1134/S1068337224700300","url":null,"abstract":"<p>The present work investigates influence of self-focused elliptical laser beam on second harmonic generation (SHG) in cold quantum plasma (CQP). There is establishment of transverse intensity gradients on account of self-focused elliptical laser beam in relativistic plasma. These intensity gradients cause excitation of electron plasma wave (EPW) at pump beam’s frequency. Excited EPW interacts nonlinearly with pump wave thereby producing 2nd harmonics. The nonlinear differential equations representing beam waist’s behavior against normalized distance is derived through Wentzel, Kramers and Brillouin (WKB), approach and paraxial theory. Nonlinear Ordinary differential equation (ODE) is solved numerically in order to explore effect of distinct laser-plasma parameters and quantum contribution on beam waist of pump wave and 2nd harmonics efficiency. The present outcome is compared with classical relativistic plasma (CRP) case.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 2","pages":"154 - 164"},"PeriodicalIF":0.5,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672693","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
Features of Spherical X-Ray Wave Diffraction by a Low Angle Twist Boundary Perpendicular to the Crystal Surface 垂直于晶体表面的低角度扭曲边界的球形 X 射线波衍射特征
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-11-18 DOI: 10.1134/S1068337224700282
L. V. Levonyan, H. M. Manukyan
{"title":"Features of Spherical X-Ray Wave Diffraction by a Low Angle Twist Boundary Perpendicular to the Crystal Surface","authors":"L. V. Levonyan,&nbsp;H. M. Manukyan","doi":"10.1134/S1068337224700282","DOIUrl":"10.1134/S1068337224700282","url":null,"abstract":"<p>An X-ray point source was used to examine the diffraction behavior of a low-angle twist boundary. It is shown that when radiation is focused inside a crystal, because of the dislocation structure of the defect wall, the vertical divergence can be reduced so much that the size of the focus in this direction is significantly smaller than in the horizontal direction. This circumstance can be used to create X-ray optical elements.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 2","pages":"214 - 218"},"PeriodicalIF":0.5,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672579","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
Optical Transitions 1S–2Px between Lowest States of a Shallow Impurity in Graphene Monolayer 石墨烯单层中浅杂质最低态之间的 1S-2Px 光学跃迁
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-11-18 DOI: 10.1134/S1068337224700245
A. P. Djotyan, A. A. Avetisyan
{"title":"Optical Transitions 1S–2Px between Lowest States of a Shallow Impurity in Graphene Monolayer","authors":"A. P. Djotyan,&nbsp;A. A. Avetisyan","doi":"10.1134/S1068337224700245","DOIUrl":"10.1134/S1068337224700245","url":null,"abstract":"<p>The binding energy of the ground and first excited states of a hydrogen-like impurity electron in monolayer graphene is studied by a variational approach. It is shown that the binding energies of the impurity electron can be tuned by changing the value of the gap and the effective fine structure constant. An analytical expression for the dipole matrix element of the electron transition from the ground to the first excited state of a hydrogen-like impurity in graphene is found.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 2","pages":"165 - 171"},"PeriodicalIF":0.5,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672628","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
Reflective Properties of Black Silicon in a Wide Spectral Range 黑硅在宽光谱范围内的反射特性
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-11-18 DOI: 10.1134/S106833722470021X
G. Y. Ayvazyan
{"title":"Reflective Properties of Black Silicon in a Wide Spectral Range","authors":"G. Y. Ayvazyan","doi":"10.1134/S106833722470021X","DOIUrl":"10.1134/S106833722470021X","url":null,"abstract":"<p>The structural and reflective properties (total reflectance and scattering) of black silicon layers formed by reactive ion etching have been studied. Reflectance spectra were determined in the visible, near-infrared, and near-ultraviolet wavelength ranges. The influence of etching duration on the optical behavior of black silicon layers is studied and the possibilities of their use in solar cells and photodetectors are discussed.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 2","pages":"188 - 192"},"PeriodicalIF":0.5,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S106833722470021X.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672582","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
Correlation Function for Heteropolymers Near the Melting Temperature 杂聚合物在熔融温度附近的相关函数
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-11-18 DOI: 10.1134/S1068337224700191
A. V. Asatryan, Y. Sh. Mamasakhlisov, V. F. Morozov
{"title":"Correlation Function for Heteropolymers Near the Melting Temperature","authors":"A. V. Asatryan,&nbsp;Y. Sh. Mamasakhlisov,&nbsp;V. F. Morozov","doi":"10.1134/S1068337224700191","DOIUrl":"10.1134/S1068337224700191","url":null,"abstract":"<p>The stability of heterogeneous biopolymers is extremely important for maintaining their conformation and carrying out biological functions. The conformational stability of these molecules determines their ability to preserve the necessary structure for biological processes such as catalytic activity, molecular recognition, and cellular interactions. Within the framework of the Generalized Model of the Polypeptide Chain (GMPC), the correlation function of a two-component heteropolymer has been computed as a function of distance, specifically the number of repeating units between two monomers in a helical state, using the method of super-matrices. Through this research, dependencies of the correlation function on the number of repeating units between monomers in the helical state have been obtained for several realizations and different temperatures, particularly around the melting temperature. An interpolation dependency has been proposed for the curve at the melting temperature, expressed as a sum of exponential and power functions. This model allows for a more accurate description of the correlation function behavior under critical conditions close to the melting temperature. The exponential part of the model reflects intense decay of correlation at short distances, while the power function describes mild changes at longer distances.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 2","pages":"208 - 213"},"PeriodicalIF":0.5,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672578","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
Photocatalytic and Radiation-Optical Properties of Lead Metasilicate Obtained by the Microwave Method 微波法获得的偏硅酸铅的光催化和辐射光学特性
IF 0.5 4区 物理与天体物理
Journal of Contemporary Physics (Armenian Academy of Sciences) Pub Date : 2024-11-18 DOI: 10.1134/S1068337224700178
N. R. Aghamalyan, A. A. Sargsyan, T. S. Azatyan, T. V. Grigoryan, A. A. Kazaryan, A. A. Petrosyan, H. T. Gyulasaryan, Ye. A. Kafadaryan, M. N. Nersisyan, N. B. Knyazyan, V. V. Baghramyan
{"title":"Photocatalytic and Radiation-Optical Properties of Lead Metasilicate Obtained by the Microwave Method","authors":"N. R. Aghamalyan,&nbsp;A. A. Sargsyan,&nbsp;T. S. Azatyan,&nbsp;T. V. Grigoryan,&nbsp;A. A. Kazaryan,&nbsp;A. A. Petrosyan,&nbsp;H. T. Gyulasaryan,&nbsp;Ye. A. Kafadaryan,&nbsp;M. N. Nersisyan,&nbsp;N. B. Knyazyan,&nbsp;V. V. Baghramyan","doi":"10.1134/S1068337224700178","DOIUrl":"10.1134/S1068337224700178","url":null,"abstract":"<p>An analysis of the properties of lead metasilicate powders synthesized by the microwave method and low-melting (900°C) glass obtained based on it has been conducted. Physical and chemical studies have shown that the synthesized lead metasilicate and the glass obtained from it are promising materials for use in various fields, namely as a wide-bandgap semiconductor, photocatalyst, and glass used for protection against ionizing radiation.</p>","PeriodicalId":623,"journal":{"name":"Journal of Contemporary Physics (Armenian Academy of Sciences)","volume":"59 2","pages":"199 - 207"},"PeriodicalIF":0.5,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672580","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
下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信