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Anharmonic Quantum Oscillator as a Model of Resonant Optics 谐振光学的非调和量子振荡器模型
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-08-06 DOI: 10.3103/S0027134925700511
A. M. Basharov
{"title":"Anharmonic Quantum Oscillator as a Model of Resonant Optics","authors":"A. M. Basharov","doi":"10.3103/S0027134925700511","DOIUrl":"10.3103/S0027134925700511","url":null,"abstract":"<p>The specific features of the theory of resonant interactions of electromagnetic coherent fields with an anharmonic oscillator, as compared to the case of a multilevel atom, are highlighted. It is shown that within the framework of the local approach—the algebraic resonance perturbation theory—it is possible to account for the requirements of the global approach of the theory of open quantum systems. Based on the auxiliary model of the ‘‘internal nonlinearity’’ of the anharmonic oscillator, the possible conditions for the resonance of a coherent wave with an anharmonic oscillator involving the absorption of a single photon are analyzed.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"80 3","pages":"551 - 559"},"PeriodicalIF":0.4,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161985","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
Quantum Oscillator As an Open System 作为开放系统的量子振荡器
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-08-06 DOI: 10.3103/S0027134925700523
A. I. Trubilko
{"title":"Quantum Oscillator As an Open System","authors":"A. I. Trubilko","doi":"10.3103/S0027134925700523","DOIUrl":"10.3103/S0027134925700523","url":null,"abstract":"<p>Using algebraic perturbation theory, the applicability of the quantum oscillator model within the theory of open quantum systems is demonstrated. The case of resonant and nonresonant interactions between two spatially separated oscillators is considered, where each oscillator interacts with its own thermostat at different temperatures. The possibility of the decay of an isolated oscillator into the thermostat of the oscillator-mediator under conditions of its nonresonant interaction with the latter is demonstrated. In all the cases presented, algebraic perturbation theory does not lead to any nonphysical features or contradictions, such as violations of the second law of thermodynamics or discrepancies in the description of these cases within the frameworks of the global and local approaches.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"80 3","pages":"573 - 584"},"PeriodicalIF":0.4,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161986","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
Controlled Growth of Carbon Nanotubes and Highly Ordered Graphene on the Pt(111) Surface Using Fluorofullerene Molecules 利用氟富勒烯分子在Pt（111）表面控制碳纳米管和高度有序石墨烯的生长
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-08-06 DOI: 10.3103/S0027134925700547
D. A. Muzychenko, S. I. Oreshkin, V. O. Surov, A. V. Samorodskiy, M. Yu. Alexandrov, V. I. Panov, A. I. Oreshkin
{"title":"Controlled Growth of Carbon Nanotubes and Highly Ordered Graphene on the Pt(111) Surface Using Fluorofullerene Molecules","authors":"D. A. Muzychenko,&nbsp;S. I. Oreshkin,&nbsp;V. O. Surov,&nbsp;A. V. Samorodskiy,&nbsp;M. Yu. Alexandrov,&nbsp;V. I. Panov,&nbsp;A. I. Oreshkin","doi":"10.3103/S0027134925700547","DOIUrl":"10.3103/S0027134925700547","url":null,"abstract":"<p>The possibility of using fluorofullerene C<span>({}_{60})</span>F<span>({}_{48})</span> for the controlled growth of carbon nanotubes and domains of highly ordered graphene, stimulated by intermediate fluorination of the platinum catalyst surface, has been demonstrated. To ensure facile detachment of fluorine atoms from the carbon framework on the Pt(111) surface, the C<span>({}_{60})</span>F<span>({}_{48})</span> molecule was selected. It is shown that fluorofullerene molecules decompose on the Pt(111) surface, losing fluorine atoms already at room temperature. High-temperature pyrolysis promotes fluorination of the Pt(111) surface and binding of amorphous carbon, inducing sequential growth of carbon nanotubes and graphene with increasing temperature.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"80 3","pages":"589 - 594"},"PeriodicalIF":0.4,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145162135","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
Remote Fiber-Optic 3D Microprobing of Scattering Media 散射介质的远程光纤三维微探测
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-08-06 DOI: 10.3103/S0027134925700626
D. A. Balakin, A. V. Belinsky
{"title":"Remote Fiber-Optic 3D Microprobing of Scattering Media","authors":"D. A. Balakin,&nbsp;A. V. Belinsky","doi":"10.3103/S0027134925700626","DOIUrl":"10.3103/S0027134925700626","url":null,"abstract":"<p>A novel method of microprobing scattering media for studying their three-dimensional structure using femtosecond light pulses, propagated to the object and returned back via a bundle of single-mode fibers, is considered. The second harmonic, generated by frequency summation of the backscattered and reference signals, is detected in the process. A number of algorithms for reconstructing the spatial distribution of the attenuation coefficient and their combination have been investigated through computer modeling.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"80 3","pages":"416 - 424"},"PeriodicalIF":0.4,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145162618","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
Algorithm for Investigating Transit Exoplanet Candidates Using the MASTER Global Robotic Telescope Network 利用MASTER全球机器人望远镜网络调查过境系外行星候选者的算法
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-08-06 DOI: 10.3103/S0027134925700432
A. N. Tarasenkov, V. M. Lipunov, A. S. Kuznetsov, N. M. Budnev, A. G. Tlatov, V. V. Yurkov
{"title":"Algorithm for Investigating Transit Exoplanet Candidates Using the MASTER Global Robotic Telescope Network","authors":"A. N. Tarasenkov,&nbsp;V. M. Lipunov,&nbsp;A. S. Kuznetsov,&nbsp;N. M. Budnev,&nbsp;A. G. Tlatov,&nbsp;V. V. Yurkov","doi":"10.3103/S0027134925700432","DOIUrl":"10.3103/S0027134925700432","url":null,"abstract":"<p>The paper presents the fundamental principles of photometric investigation of exoplanet candidates through the analysis of archival wide-field images obtained with the robotic telescopes of the MASTER Global Network of Lomonosov Moscow State University. An algorithm has been developed and applied for studying transit exoplanet candidates that does not interfere with the primary objectives of the MASTER network—the detection of optical counterparts of high-energy astrophysical sources and the study of processes occurring in them on various time scales. A number of candidates in the field of the microquasar V404 Cyg have been examined. For the candidate TOI-3570.01, a light curve during the transit of the presumed exoplanet has been obtained, consistent with the calculated ephemerides.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"80 3","pages":"619 - 624"},"PeriodicalIF":0.4,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145162143","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 Misalignment on Track Reconstruction in the Time Projection Chamber of the MultiPurpose Detector (MPD) 误差对多用途探测器时间投影室航迹重建的影响
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-08-06 DOI: 10.3103/S0027134925700456
V. A. Kuzmin
{"title":"Influence of Misalignment on Track Reconstruction in the Time Projection Chamber of the MultiPurpose Detector (MPD)","authors":"V. A. Kuzmin","doi":"10.3103/S0027134925700456","DOIUrl":"10.3103/S0027134925700456","url":null,"abstract":"<p>Using the previously developed alignment method for the Time Projection Chamber (TPC) in the MPD detector, the influence of misalignment on the reconstructed parameters of a charged particle track, such as transverse momentum and rapidity, is studied. The concept of a misalignment unit is introduced for the TPC. By simulating the TPC response to charged particles, distortions in the reconstructed track parameters depending on the magnitude of misalignment are analyzed. The influence of alignment errors on the reconstructed track parameters in the MPD TPC can be neglected. A systematic variation of the measured transverse momentum depending on the track projection width onto the readout plane is observed. This width is determined by the gas conditions and the electric field in the detector chamber. The alignment tools developed for the MPD Time Projection Chamber make it possible to estimate this width from experimental data and apply corrections to the reconstructed track parameters.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"80 3","pages":"500 - 505"},"PeriodicalIF":0.4,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145162431","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
New Approaches to Visualization and Analysis of Flows in Shock Tubes 激波管内流动可视化与分析的新方法
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-08-06 DOI: 10.3103/S0027134925700596
D. I. Dolbnia, I. A. Doroshchenko, I. A. Znamenskaya, M. I. Muratov
{"title":"New Approaches to Visualization and Analysis of Flows in Shock Tubes","authors":"D. I. Dolbnia,&nbsp;I. A. Doroshchenko,&nbsp;I. A. Znamenskaya,&nbsp;M. I. Muratov","doi":"10.3103/S0027134925700596","DOIUrl":"10.3103/S0027134925700596","url":null,"abstract":"<p>In this paper, new approaches to the investigation of gas-dynamic processes in shock tubes using modern methods of visualization and analysis are presented. Studies were conducted on the flow behind a shock wave in a rectangular channel of a shock tube with constant cross-section and in a channel with an obstacle. The experiments include the use of high-speed digital imaging, infrared thermography, particle tracing, allowing high temporal and spatial resolution analysis of the flow evolution in the shock tube. The obtained results showed that the flow in the channel of the shock tube can be used for investigations for 20–25 ms, which significantly exceeds the time ranges previously used. It is possible to carry out experiments, including studies of heat-and-mass transfer associated with the flow around the channel walls, obstacles with initiation of pulsed discharges in the flow. Results of the investigation of the evolution of flow parameters are presented. It is shown that the use of machine learning and computer vision methods, including convolutional neural networks, enables effective processing and analysis of large datasets obtained during high-speed recording.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"80 3","pages":"625 - 632"},"PeriodicalIF":0.4,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145162144","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
Gravitational Bremsstrahlung in Collisions of Ultrarelativistic Charges in the Five-Dimensional ADD Model 五维ADD模型中超相对论性电荷碰撞中的引力轫致效应
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-08-06 DOI: 10.3103/S0027134925700717
Yu. V. Grats, P. A. Spirin
{"title":"Gravitational Bremsstrahlung in Collisions of Ultrarelativistic Charges in the Five-Dimensional ADD Model","authors":"Yu. V. Grats,&nbsp;P. A. Spirin","doi":"10.3103/S0027134925700717","DOIUrl":"10.3103/S0027134925700717","url":null,"abstract":"<p>Within the five-dimensional ADD model of space-time with compactification radius <span>(R)</span>, we consider the classical gravitational bremsstrahlung arising from the collision of two ultrarelativistic charges. The collision is governed by the impact parameter <span>(b)</span> and the Lorentz factor <span>(gamma)</span>. Using the perturbation theory, the total energy, radiated as a gravitational wave, is calculated in the leading order in <span>(gamma)</span>, as well as the spectral-angular and polarization characteristics. The radiation is characterized by concentration within a cone of opening angle of order <span>(1/gamma)</span>, with the dominant contribution coming from frequencies of order <span>(gamma^{2}/b)</span>. The average number of Kaluza–Klein emission modes is estimated to be of the order of <span>(gamma R/b)</span>.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"80 3","pages":"467 - 474"},"PeriodicalIF":0.4,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145162146","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
Secure Quantum Channels Based on Multiphoton Entanglement 基于多光子纠缠的安全量子通道
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-08-06 DOI: 10.3103/S0027134925700444
A. V. Belinsky, A. P. Grigorieva, I. I. Dzhadan
{"title":"Secure Quantum Channels Based on Multiphoton Entanglement","authors":"A. V. Belinsky,&nbsp;A. P. Grigorieva,&nbsp;I. I. Dzhadan","doi":"10.3103/S0027134925700444","DOIUrl":"10.3103/S0027134925700444","url":null,"abstract":"<p>The potential for information transmission via quantum channels with multiphoton entanglement is considered. Protocols for quantum key distribution and direct information transmission are developed, with strict consideration of the sending and receiving times of messages, which helps to counteract a wide range of attacks.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"80 3","pages":"425 - 431"},"PeriodicalIF":0.4,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145162428","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
Existence and Stability of a Stationary Solution with a Boundary Layer in a Two-Dimensional System of Fast and Slow Reaction–Diffusion–Advection Equations with KPZ Nonlinearities 含KPZ非线性的二维快、慢反应-扩散-平流方程组具有边界层的平稳解的存在性和稳定性
IF 0.4 4区 物理与天体物理
Moscow University Physics Bulletin Pub Date : 2025-08-06 DOI: 10.3103/S0027134925700675
A. O. Orlov
{"title":"Existence and Stability of a Stationary Solution with a Boundary Layer in a Two-Dimensional System of Fast and Slow Reaction–Diffusion–Advection Equations with KPZ Nonlinearities","authors":"A. O. Orlov","doi":"10.3103/S0027134925700675","DOIUrl":"10.3103/S0027134925700675","url":null,"abstract":"<p>The paper considers a boundary-value problem for a singularly perturbed elliptic system of fast and slow equations, commonly referred to as a system of Tikhonov type. A distinctive feature of the problem is the presence of terms containing the squared gradient of the unknown function (KPZ nonlinearities). A boundary layer asymptotic expansion of the solution is constructed in the case of Dirichlet boundary conditions, the existence of a solution with the constructed asymptotics is proved, and its Lyapunov asymptotic stability is studied. The proof of the theorems is based on the asymptotic method of differential inequalities developed by N.N. Nefedov.</p>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":"80 3","pages":"441 - 448"},"PeriodicalIF":0.4,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145162430","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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