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Bulletin of the Russian Academy of Sciences: Physics最新文献

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Analyzing Heart Tones to Diagnose Pulmonary Hypertension 心音分析诊断肺动脉高压
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2026-02-25 DOI: 10.1134/S1062873825714321
M. V. Ryabkov, V. V. Gramovich, K. V. Dmitriev
{"title":"Analyzing Heart Tones to Diagnose Pulmonary Hypertension","authors":"M. V. Ryabkov,&nbsp;V. V. Gramovich,&nbsp;K. V. Dmitriev","doi":"10.1134/S1062873825714321","DOIUrl":"10.1134/S1062873825714321","url":null,"abstract":"<p>The authors propose a way of diagnosing pulmonary hypertension through machine learning-based analysis of phonocardiograms. The technique offers a cost-effective and non-invasive solution that allows it to be used in primary healthcare. It is particularly valuable for regions with limited access to specialized clinics and highly qualified cardiologists.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"90 1","pages":"118 - 122"},"PeriodicalIF":0.48,"publicationDate":"2026-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147341848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A 3D Model of the Upper Mantle near the Hawaiian Archipelago Based on Surface-Wave Tomography Data 基于表面波层析成像数据的夏威夷群岛附近上地幔三维模型
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2026-02-25 DOI: 10.1134/S1062873825714412
D. D. Pozdnyakova, D. A. Presnov, A. S. Shurup
{"title":"A 3D Model of the Upper Mantle near the Hawaiian Archipelago Based on Surface-Wave Tomography Data","authors":"D. D. Pozdnyakova,&nbsp;D. A. Presnov,&nbsp;A. S. Shurup","doi":"10.1134/S1062873825714412","DOIUrl":"10.1134/S1062873825714412","url":null,"abstract":"<p>The results of tomographic reconstruction of shear-wave velocity inhomogeneities in the lithosphere and upper asthenosphere near the Hawaiian archipelago are presented. The initial data used are surface-wave propagation times estimated from microseismic noise correlations recorded by a network of ocean bottom seismic stations. The obtained reconstruction results agree with the expected parameter distribution in the region of the Hawaiian hotspot.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"90 1","pages":"123 - 128"},"PeriodicalIF":0.48,"publicationDate":"2026-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147341963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Using Radio Photonics in Designing Microwave Receivers to Determine the Angle of Signal Arrival by Creating Radio Holograms 利用射电光子学设计微波接收机，通过创建射电全息图来确定信号到达的角度
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2026-02-25 DOI: 10.1134/S1062873825714230
D. Burkitbayev, V. V. Kulagin, R. V. Ryzhuk, V. V. Valuev, N. I. Kargin, V. A. Cherepenin
{"title":"Using Radio Photonics in Designing Microwave Receivers to Determine the Angle of Signal Arrival by Creating Radio Holograms","authors":"D. Burkitbayev,&nbsp;V. V. Kulagin,&nbsp;R. V. Ryzhuk,&nbsp;V. V. Valuev,&nbsp;N. I. Kargin,&nbsp;V. A. Cherepenin","doi":"10.1134/S1062873825714230","DOIUrl":"10.1134/S1062873825714230","url":null,"abstract":"<p>A theoretical study is performed of a microwave receiver constructed using radio-photonic components to determine the angle of arrival of a spherical wave front reflected from a distant object. A way for arranging receivers on a linear antenna array is proposed to reduce the error in determining the angle of arrival of a signal with a spherical wave front.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"90 1","pages":"59 - 63"},"PeriodicalIF":0.48,"publicationDate":"2026-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147341967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Electron Beam Bunching in High-Power Relativistic Klystrons 高能相对论速调管中的电子束聚束
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2026-02-25 DOI: 10.1134/S1062873825714242
V. E. Rodyakin, V. N. Aksenov
{"title":"Electron Beam Bunching in High-Power Relativistic Klystrons","authors":"V. E. Rodyakin,&nbsp;V. N. Aksenov","doi":"10.1134/S1062873825714242","DOIUrl":"10.1134/S1062873825714242","url":null,"abstract":"<p>The authors discuss results from studying the effect 2D processes have on the bunching of electrons in high-power single-beam relativistic klystrons. Data are presented on the maximum achievable efficiency of such devices. Results are presented from a numerical analysis of the structure and magnitude of wake fields of relativistic electron bunches as a function of the degree of compression of bunches and the energy of electrons.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"90 1","pages":"64 - 69"},"PeriodicalIF":0.48,"publicationDate":"2026-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147341974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Two-Color Parametric Solitons 双色参数孤子
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2026-02-25 DOI: 10.1134/S106287382571414X
S. V. Sazonov
{"title":"Two-Color Parametric Solitons","authors":"S. V. Sazonov","doi":"10.1134/S106287382571414X","DOIUrl":"10.1134/S106287382571414X","url":null,"abstract":"<p>A brief analysis is performed of theoretical constructions related to studying the formation of two-color parametric solitons in the mode of second harmonic generation. Spatial, temporal, and spatiotemporal two-color solitons of different types are considered, including bright, dark, and bright–dark wave objects.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"90 1","pages":"12 - 15"},"PeriodicalIF":0.48,"publicationDate":"2026-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147341964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Anisotropy of the Floquet Spectrum of a Dirac Crystal, Induced by a Bichromatic Field 双色场诱导狄拉克晶体Floquet谱的各向异性
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2026-02-25 DOI: 10.1134/S1062873825714205
I. A. Konishchev, S. V. Kryuchkov, E. I. Kukhar
{"title":"Anisotropy of the Floquet Spectrum of a Dirac Crystal, Induced by a Bichromatic Field","authors":"I. A. Konishchev,&nbsp;S. V. Kryuchkov,&nbsp;E. I. Kukhar","doi":"10.1134/S1062873825714205","DOIUrl":"10.1134/S1062873825714205","url":null,"abstract":"<p>The quasi-energy of Dirac electrons in the electromagnetic field of bichromatic radiation is calculated using the Floquet formalism. The possibility of the law of charge carrier dispersion being altered by its interaction with a wave of a high-frequency electric field is demonstrated. The existence of the second harmonic ensures anisotropy of the modified law of dispersion in the momentum space.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"90 1","pages":"42 - 46"},"PeriodicalIF":0.48,"publicationDate":"2026-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147341970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Using a Structure of Plane-Parallel Solid Layers to Suppress Multiple Reflections between a Piezoelectric Source and a Target Particle in the Study of Acoustic Radiation Force 在声辐射力研究中，利用平面平行固体层结构抑制压电源与目标粒子之间的多次反射
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2026-02-25 DOI: 10.1134/S106287382571428X
E. A. Petrov, L. M. Kotelnikova, S. A. Tsysar, O. A. Sapozhnikov
{"title":"Using a Structure of Plane-Parallel Solid Layers to Suppress Multiple Reflections between a Piezoelectric Source and a Target Particle in the Study of Acoustic Radiation Force","authors":"E. A. Petrov,&nbsp;L. M. Kotelnikova,&nbsp;S. A. Tsysar,&nbsp;O. A. Sapozhnikov","doi":"10.1134/S106287382571428X","DOIUrl":"10.1134/S106287382571428X","url":null,"abstract":"<p>It was demonstrated that oscillations in the dependence of the acoustic radiation force on the distance between a focusing piezoelectric source and a spherical scatterer can be reduced by adding a layered structure consisting of plane-parallel acrylic glass plates to the space between the transducer and the scatterer. It was experimentally confirmed that the formation of standing waves, which cause oscillations, is minimized by absorbing and scattering acoustic waves reflected from the source. The ability to control the oscillation level by varying the number of plates was shown. The theoretically calculated radiation force levels in the presence of the layered structure agree with those measured.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"90 1","pages":"85 - 89"},"PeriodicalIF":0.48,"publicationDate":"2026-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147341976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Laminar and Oscillatory Convection of a Fluid in a Closed Area with Lateral Heating 横向加热封闭区域内流体的层流和振荡对流
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2026-02-25 DOI: 10.1134/S1062873825714308
A. I. Fedyushkin
{"title":"Laminar and Oscillatory Convection of a Fluid in a Closed Area with Lateral Heating","authors":"A. I. Fedyushkin","doi":"10.1134/S1062873825714308","DOIUrl":"10.1134/S1062873825714308","url":null,"abstract":"<p>Results are presented from numerical parametric calculations based on a finite-difference solution of two-dimensional Navier–Stokes equations for a viscous incompressible fluid in a closed square region heated from the side. Gravitational convection is modeled for a wide range of defining dimensionless parameters: Grashof number <span>(0 &lt; {text{Gr}} &lt; {{10}^{8}})</span>, Prandtl number <span>({text{1}}{{{text{0}}}^{{ - 2}}} &lt; {text{Pr}} &lt; {{10}^{2}})</span>, concentrational Grashof number <span>(0 &lt; {text{G}}{{{text{r}}}_{{text{C}}}} &lt; {{10}^{8}})</span>, and Schmidt number <span>({text{1}}{{{text{0}}}^{{ - 2}}} &lt; {text{Sc}} &lt; {{10}^{2}})</span>. Results from modeling show the nonmonotonic nature of the dependence of the vertical stratification in temperature and concentration on the Grashof numbers, along with dynamics of the formation of steady-state oscillatory convective flows of a viscous liquid. For intense laminar convection, there is a narrow range of Grashof numbers that depends non-linearly on the Prandtl number. In this range, the steady convective flow has an ordered oscillatory periodic pattern caused by metastable changes in the stable state of secondary macro-vortices on the heated and cooled boundaries, and their subsequent movement along the closed boundary layer. When the Grashof numbers are raised even more, the periodic convective flow regime becomes a chaotic oscillatory and then turbulent regime.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"90 1","pages":"104 - 111"},"PeriodicalIF":0.48,"publicationDate":"2026-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147341983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Polarization Holographic Monitoring for Laser Treatment Diffractive Optical Elements and Metasurfaces Fabrication in Functional Materials Photonics 激光处理衍射光学元件的偏振全息监测及功能材料光子学中的超表面制造
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2026-02-19 DOI: 10.1134/S1062873825714898
T. V. Reztsov, A. V. Chernykh, A. S. Ezerskii, Tangkun Han, V. R. Gresko, E. G. Tsiplakova, Jianyi Li, M. M. Sergeev, Baoku Wang, T. Orlova, Li Li, S. Makarov, Hao Tian, N. V. Petrov
{"title":"Polarization Holographic Monitoring for Laser Treatment Diffractive Optical Elements and Metasurfaces Fabrication in Functional Materials Photonics","authors":"T. V. Reztsov,&nbsp;A. V. Chernykh,&nbsp;A. S. Ezerskii,&nbsp;Tangkun Han,&nbsp;V. R. Gresko,&nbsp;E. G. Tsiplakova,&nbsp;Jianyi Li,&nbsp;M. M. Sergeev,&nbsp;Baoku Wang,&nbsp;T. Orlova,&nbsp;Li Li,&nbsp;S. Makarov,&nbsp;Hao Tian,&nbsp;N. V. Petrov","doi":"10.1134/S1062873825714898","DOIUrl":"10.1134/S1062873825714898","url":null,"abstract":"<p>We demonstrate the application of a custom-built polarization holographic microscope (PHM) for comprehensive characterization of laser-fabricated and self-assembled optical elements. We investigate two distinct material platforms: silver-doped zinc oxide (ZnO:Ag) sol–gel films structured by femtosecond direct laser writing, and self-assembled torons, namely soft topological solitons, in chiral nematic liquid crystals (LCs). The PHM enables single-shot, multi-wavelength (450, 532, 660 nm) reconstruction of the full Jones matrix, providing complete amplitude, phase, and polarization information. For ZnO:Ag films, we show that laser writing induces programmable dichroism and birefringence, characterized by a spectrally dependent phase shift (e.g., +π/4 at 450 nm and –π/8 at 660 nm between orthogonal Jones matrix components), establishing a foundation for all-dielectric metasurfaces. For torons, PHM analysis of torons in 25 µm LC cells reveals complex ring structure of the corresponding phase and light intensity distributions and confirms the robustness of their optical functions (e.g., vortex generation) across the visible spectrum.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 4","pages":"S523 - S533"},"PeriodicalIF":0.48,"publicationDate":"2026-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Advanced Pulsed Laser Ablation in Liquid Technique to Fabricate Composite Si/Au Nanoparticles for Biophotonics 先进脉冲激光烧蚀液相技术制备生物光子学用硅/金复合纳米颗粒
IF 0.48
Bulletin of the Russian Academy of Sciences: Physics Pub Date : 2026-02-19 DOI: 10.1134/S1062873825714825
V. Nesterov, S. Zabotnov, D. Shuleiko, D. Presnov, S. Terentev, S. Gurbatov, E. Sergeeva, M. Kirillin, A. Kuchmizhak
{"title":"Advanced Pulsed Laser Ablation in Liquid Technique to Fabricate Composite Si/Au Nanoparticles for Biophotonics","authors":"V. Nesterov,&nbsp;S. Zabotnov,&nbsp;D. Shuleiko,&nbsp;D. Presnov,&nbsp;S. Terentev,&nbsp;S. Gurbatov,&nbsp;E. Sergeeva,&nbsp;M. Kirillin,&nbsp;A. Kuchmizhak","doi":"10.1134/S1062873825714825","DOIUrl":"10.1134/S1062873825714825","url":null,"abstract":"<p>Silicon nanoparticles decorated with small gold (Au) inclusions are of potential interest as agents for efficient photothermal conversion in tumor hyperthermia applications. In this work, we present the technology for synthesizing a suspension of composite silicon–gold (Si/Au) nanoparticles with a core-satellite type morphology. They are quasi-spherical with the mean diameter of up to 75 nm and relative size dispersion not exceeding 32%, while the decorating Au inclusions range in size of 5–15 nm. Fabrication is implemented through a dual-stage laser ablation technique employing a porous silicon target, ethanol (first stage) and a water-ethanol solution with chloroauric acid HAuCl<sub>4</sub> (second stage) as buffer media. The fabricated composite Si/Au nanoparticles possess a high degree of crystallinity and exhibit moderate colloidal stability in water.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 4","pages":"S487 - S491"},"PeriodicalIF":0.48,"publicationDate":"2026-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","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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