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Bulletin of the Lebedev Physics Institute最新文献

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Sector Spiral Plate Based on the DHF Effect in Liquid Crystal Ferroelectrics 基于DHF效应的液晶铁电体扇形螺旋板
IF 0.7 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-09-21 DOI: 10.3103/S106833562560295X
S. P. Kotova, E. P. Pozhidaev, S. A. Samagin
{"title":"Sector Spiral Plate Based on the DHF Effect in Liquid Crystal Ferroelectrics","authors":"S. P. Kotova,&nbsp;E. P. Pozhidaev,&nbsp;S. A. Samagin","doi":"10.3103/S106833562560295X","DOIUrl":"10.3103/S106833562560295X","url":null,"abstract":"<p>We report a detailed study of characteristics of vortex light fields formed using a sector spiral plate based on the DHF effect in liquid crystal ferroelectrics with a subwavelength helix pitch. In contrast to conventional nematic liquid crystal spatial light modulators, this crystal provides a switching frequency of up to 3 kHz. However, the process of crystal reorientation leads to a change in the polarization state of the modulated light. The issues of light field formation under these conditions are considered. It is shown that a change in the light polarization state does not significantly affect the formation of vortex fields. The experimentally measured values of the topological charge are in good agreement with the calculated ones.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"52 4 supplement","pages":"S407 - S418"},"PeriodicalIF":0.7,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145100712","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
Simulation of Oblique Ray Trajectories in a Multimode Tapered Optical Fiber 多模锥形光纤中斜射线轨迹的模拟
IF 0.7 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-09-21 DOI: 10.3103/S1068335625603012
A. A. Makovetskii, S. M. Popov, D. V. Ryakhovskii
{"title":"Simulation of Oblique Ray Trajectories in a Multimode Tapered Optical Fiber","authors":"A. A. Makovetskii,&nbsp;S. M. Popov,&nbsp;D. V. Ryakhovskii","doi":"10.3103/S1068335625603012","DOIUrl":"10.3103/S1068335625603012","url":null,"abstract":"<p>Within the framework of the geometric optics model, an algorithm is developed for numerical calculation of the oblique ray trajectory in a highly multimode tapered optical fiber with a rectilinear generatrix. The algorithm makes it possible to simulate 3D trajectories of oblique rays in a tapered fiber with larger and smaller core diameters <i>D</i>/<i>d</i> = 400/200 μm/μm, length <i>l</i><sub><i>t</i></sub> = 10 cm, and a nominal numerical aperture <i>NA</i> = 0.42. Aperture properties of such fiber and regimes of ray propagation along the taper are studied; “resonant” types of trajectories are identified. Experiments are performed to excite oblique rays in a taper with core diameters <i>D</i>/<i>d</i> = 2000/400 μm/μm, <i>l</i><sub><i>t</i></sub> = 30 cm, and a nominal numerical aperture <i>NA</i> = 0.22 upon illumination from a larger diameter, qualitatively confirming the results of numerical simulation.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"52 4 supplement","pages":"S396 - S406"},"PeriodicalIF":0.7,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145100760","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
Two-Dimensional Model for Induction Current Distribution in a Superconducting Film 超导薄膜中感应电流分布的二维模型
IF 0.7 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-08-20 DOI: 10.3103/S106833562560233X
S. Yu. Gavrilkin, A. Yu. Tsvetkov
{"title":"Two-Dimensional Model for Induction Current Distribution in a Superconducting Film","authors":"S. Yu. Gavrilkin,&nbsp;A. Yu. Tsvetkov","doi":"10.3103/S106833562560233X","DOIUrl":"10.3103/S106833562560233X","url":null,"abstract":"<p>We present a simple model for calculating the distribution of the currents induced in a superconducting film by a local alternating magnetic field of a measuring coil. The model takes into account both radial and thickness nonuniform current distribution. The spatial distribution of the peak values of the current density in the sample is obtained, and the spectral composition of the response signal is considered depending on the amplitude of the drive current. The model response is compared with the experimental data.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"52 7","pages":"316 - 320"},"PeriodicalIF":0.7,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144868991","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
On Weak Gravitational Radiation 关于弱引力辐射
IF 0.7 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-08-20 DOI: 10.3103/S106833562560192X
A. I. Nikishov
{"title":"On Weak Gravitational Radiation","authors":"A. I. Nikishov","doi":"10.3103/S106833562560192X","DOIUrl":"10.3103/S106833562560192X","url":null,"abstract":"<p>This paper shows that when the velocities of particles in a source are small in comparison with the velocity of light any source generates soft gravitational radiation in which the wavelength is much larger then the dimension of the source. In this case only the polarization of gravitons determines the source and it should not depend on its nature: it may be a string, an accelerated electron, or only the gravitational force acting between the particles in the source. The main harmonic is, of course, quadrupole, the rest are small because of the small velocities of the particles in the source. Their observation would be interesting because it would provide information on the particle velocities in the source.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"52 7","pages":"308 - 308"},"PeriodicalIF":0.7,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144868992","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
Electronic and Spectral Properties of an Anion and a Radical of the CH2CHO Molecule CH2CHO分子阴离子和自由基的电子和光谱性质
IF 0.7 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-08-20 DOI: 10.3103/S1068335625602353
A. V. Mekshun, A. A. Narits
{"title":"Electronic and Spectral Properties of an Anion and a Radical of the CH2CHO Molecule","authors":"A. V. Mekshun,&nbsp;A. A. Narits","doi":"10.3103/S1068335625602353","DOIUrl":"10.3103/S1068335625602353","url":null,"abstract":"<p>Potential energy surfaces of a neutral radical and an anion of the CH<sub>2</sub>CHO molecule are calculated. The effect of the presence of two alternative electronic configurations of the neutral molecule is analyzed. New data are presented on the dependence of the energies of the ground states of the radical and valence-bound negative ion on the key geometric parameters. The oscillator strengths of the transition between the valence-bound and dipole-bound anion states are determined.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"52 7","pages":"291 - 300"},"PeriodicalIF":0.7,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144868994","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
Simulation of a Muography Experiment on Studying the Kagan-Princely Type Monument 研究卡根-王子式纪念碑的摄影实验模拟
IF 0.7 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-08-20 DOI: 10.3103/S1068335625602201
N. S. Konovalova, N. M. Okateva, Zh. T. Sadykov, E. N. Starkova
{"title":"Simulation of a Muography Experiment on Studying the Kagan-Princely Type Monument","authors":"N. S. Konovalova,&nbsp;N. M. Okateva,&nbsp;Zh. T. Sadykov,&nbsp;E. N. Starkova","doi":"10.3103/S1068335625602201","DOIUrl":"10.3103/S1068335625602201","url":null,"abstract":"<p>We report the results of simulation of expected angular flux distributions of atmospheric muons after their absorption in an object with a foreign inclusion for a muography study of the Early Saka period monument, the Karkara burial complex.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"52 7","pages":"301 - 307"},"PeriodicalIF":0.7,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144868995","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
Temperature Dependence of Grain-Boundary Critical Current in K0.8Fe1.7(Se0.73S0.27)2 and CaKFe4As4 K0.8Fe1.7(Se0.73S0.27)2和CaKFe4As4晶界临界电流的温度依赖性
IF 0.7 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-08-20 DOI: 10.3103/S1068335625602390
T. E. Kuzmicheva, S. A. Kuzmichev, A. D. Ilina, I. A. Nikitchenkov, Ye. O. Rakhmanov, A. I. Shilov, I. V. Morozov, A. S. Medvedev, V. A. Vlasenko, K. S. Pervakov
{"title":"Temperature Dependence of Grain-Boundary Critical Current in K0.8Fe1.7(Se0.73S0.27)2 and CaKFe4As4","authors":"T. E. Kuzmicheva,&nbsp;S. A. Kuzmichev,&nbsp;A. D. Ilina,&nbsp;I. A. Nikitchenkov,&nbsp;Ye. O. Rakhmanov,&nbsp;A. I. Shilov,&nbsp;I. V. Morozov,&nbsp;A. S. Medvedev,&nbsp;V. A. Vlasenko,&nbsp;K. S. Pervakov","doi":"10.3103/S1068335625602390","DOIUrl":"10.3103/S1068335625602390","url":null,"abstract":"<p>Using tunneling spectroscopy of break-junctions, we have studied the temperature behavior of the critical current <i>I</i><sub>c</sub>(<i>T</i>) at zero magnetic field for alkali-metal based superconductors: composite K<sub>0.8</sub>Fe<sub>1.7</sub>(Se<sub>0.73</sub>S<sub>0.27</sub>)<sub>2</sub> selenides with natural phase separation and polycrystalline samples of CaKFe<sub>4</sub>As<sub>4</sub> pnictides. The measured bulk and intergrain <i>I</i><sub>c</sub>(<i>T</i>) dependences are analyzed and compared.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"52 7","pages":"321 - 329"},"PeriodicalIF":0.7,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144868996","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
Concept of Dynamical Traps and Action Points 动态陷阱和行动点的概念
IF 0.7 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-08-20 DOI: 10.3103/S1068335625602316
I. A. Lubashevsky, V. I. Lubashevskiy, N. G. Gusein-zade
{"title":"Concept of Dynamical Traps and Action Points","authors":"I. A. Lubashevsky,&nbsp;V. I. Lubashevskiy,&nbsp;N. G. Gusein-zade","doi":"10.3103/S1068335625602316","DOIUrl":"10.3103/S1068335625602316","url":null,"abstract":"<p>Within the paradigm of intermittent human control, we propose a novel model of dynamical traps to describe the balancing of a dynamical system near its unstable equilibrium. The core of this model is probabilistic, featuring alternating transitions between two behavioral modes of the subject – active and passive phases – in regulating the dynamics of the controlled object. These modes are delineated by action points, which represent the moments when the subject decides to switch between modes. This switching behavior is modeled using an original stochastic differential equation. Within this approach, action points are conceptualized as stepwise transitions in a special variable, <span>(zeta )</span>, which switches between two boundary values: <span>(zeta = 0)</span> and <span>(zeta = 1)</span>. The introduced trap function, <span>(Omega (Delta ))</span>, quantifies the subject’s perception of the object’s deviation from the unstable equilibrium or a desired state, thereby determining the current priority of the two behavioral modes. Crucially, these transitions— action points—occur before the trap function reaches its extreme values, <span>(Omega (Delta ) = 0)</span> or <span>(Omega (Delta ) = 1)</span>, underscoring the probabilistic nature of intermittent human control.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"52 7","pages":"338 - 345"},"PeriodicalIF":0.7,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144868990","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
Analysis of RICH Detector Images Using a Neural Network RICH探测器图像的神经网络分析
IF 0.7 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-08-20 DOI: 10.3103/S1068335625602225
N. I. Starkov
{"title":"Analysis of RICH Detector Images Using a Neural Network","authors":"N. I. Starkov","doi":"10.3103/S1068335625602225","DOIUrl":"10.3103/S1068335625602225","url":null,"abstract":"<p>The paper considers a possibility of processing signals from a RICH detector using a neural network when a high-energy particle passes through it at an angle to the sensitive plane. It is shown that only the coordinates of the initiated photomultiplier tubes are required in this case to determine the charge, velocity, and angle of a particle.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"52 7","pages":"330 - 337"},"PeriodicalIF":0.7,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144868989","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
Modification of Bismuth Ferrite BiFeO3 Nanopowder under the Action of High-Power Pulsed Microwave Radiation of a Gyrotron 高功率脉冲微波回旋管作用下铋铁氧体BiFeO3纳米粉体的改性
IF 0.7 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-08-20 DOI: 10.3103/S1068335625602456
Z. G. Ragimkhanova, G. B. Ragimkhanov, S. Kh. Gadzimagomedov, D. V. Malakhov, A. S. Sokolov, E. V. Voronova, N. N. Skvortsova, N. G. Gusein-zade
{"title":"Modification of Bismuth Ferrite BiFeO3 Nanopowder under the Action of High-Power Pulsed Microwave Radiation of a Gyrotron","authors":"Z. G. Ragimkhanova,&nbsp;G. B. Ragimkhanov,&nbsp;S. Kh. Gadzimagomedov,&nbsp;D. V. Malakhov,&nbsp;A. S. Sokolov,&nbsp;E. V. Voronova,&nbsp;N. N. Skvortsova,&nbsp;N. G. Gusein-zade","doi":"10.3103/S1068335625602456","DOIUrl":"10.3103/S1068335625602456","url":null,"abstract":"<p>Microwave radiation of a gyrotron, during its interaction with powder mixtures, initiates plasma-chemical exothermic processes in air in which components of the initial powder mixture participate. In the experiments performed, use is made of bismuth ferrite (<span>({text{BiFe}}{{{text{O}}}_{3}})</span>) nanopowders with a particle size of 40–50 nm, which are transformed into spheroid microparticles with a size up to 100 μm and a complicated structure and surface morphology. The surface of the synthesized particles has nanoinclusions and dips, due to which the surface area increases (by ~1.5 times). On the surface of the produced particles, two types of inclusions (grains) with an increased iron content and a size up to 3 μm are found against the background of bismuth ferrite, with their shape having the form of quadrangles and hexagons.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"52 7","pages":"309 - 315"},"PeriodicalIF":0.7,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144868993","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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