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Bulletin of the Lebedev Physics Institute最新文献

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Study of Efficiency of Formation of Core–Satellite Gold- and Iron-Based Nanostructures by Laser Ablation Synthesis 通过激光烧蚀合成形成核心-卫星金基和铁基纳米结构的效率研究
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-11-25 DOI: 10.3103/S1068335624601821
A. A. Laktionov, I. V. Sozaev, D. I. Tselikov, G. V. Tikhonovskii, M. S. Grigor’yeva, S. M. Klimentov, I. N. Zavestovskaya, A. V. Kabashin, A. A. Popov
{"title":"Study of Efficiency of Formation of Core–Satellite Gold- and Iron-Based Nanostructures by Laser Ablation Synthesis","authors":"A. A. Laktionov,&nbsp;I. V. Sozaev,&nbsp;D. I. Tselikov,&nbsp;G. V. Tikhonovskii,&nbsp;M. S. Grigor’yeva,&nbsp;S. M. Klimentov,&nbsp;I. N. Zavestovskaya,&nbsp;A. V. Kabashin,&nbsp;A. A. Popov","doi":"10.3103/S1068335624601821","DOIUrl":"10.3103/S1068335624601821","url":null,"abstract":"<p>We report the results of experimental work on laser synthesis of colloidal solutions of core–satellite nanostructures based on gold and iron (Au@Fe). The synthesis is optimized; the main result of optimization is an increase in the fraction of the synthesized Au@Fe nanoparticles (NPs) to 80% of the total number of NPs obtained while maintaining high synthesis productivity. The NPs synthesized using the optimized technology have a spherical shape with an average size of about 90 nm, and retain an optical extinction peak important for applications, which has a maximum of about 600 nm and a wide shoulder in the long-wavelength region. The Au@Fe nanoparticles are promising for use as a contrast agent in magnetic resonance and computed tomography, as well as sensitizers in photothermal and proton therapies.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 7 supplement","pages":"S602 - S607"},"PeriodicalIF":0.6,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714471","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
Filamentation of 100-fs Pulses from a Ti:Sapphire Laser in Gases to Generate a Signal Wave of a Difference Frequency Generator 将气体中的钛蓝宝石激光器发出的 100 fs 脉冲制成丝状，以产生差频发生器的信号波
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-11-25 DOI: 10.3103/S106833562460178X
I. O. Kinyaevskii, Ya. V. Grudtsyn, A. V. Koribut, M. V. Ionin
{"title":"Filamentation of 100-fs Pulses from a Ti:Sapphire Laser in Gases to Generate a Signal Wave of a Difference Frequency Generator","authors":"I. O. Kinyaevskii,&nbsp;Ya. V. Grudtsyn,&nbsp;A. V. Koribut,&nbsp;M. V. Ionin","doi":"10.3103/S106833562460178X","DOIUrl":"10.3103/S106833562460178X","url":null,"abstract":"<p>In order to increase the energy of a signal wave for a difference frequency generator, a spectral broadening of 100-fs pulses from a Ti:sapphire laser (center wavelength of 950 nm) is experimentally studied during their filamentation in five different gases: N<sub>2</sub>, NH<sub>3</sub>, He, CO<sub>2</sub>, and CO. The greatest broadening and the highest energy in the Stokes region of the spectrum are observed for CO<sub>2</sub>. Variation in the CO<sub>2</sub> pressure in the gas cell shows that for a Ti:sapphire laser with a pulse energy of several mJ, the highest radiation energy in the Stokes wing with a shift of ∼1000 cm<sup>–1</sup> is achieved at a pressure of 1 bar. Also, for each of the studied gases, the nonlinear refractive index is estimated at a pressure of 1 bar.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 7 supplement","pages":"S557 - S563"},"PeriodicalIF":0.6,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714469","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
Reconstruction of the Complex Field of an Exit Wave of a Phase Object from Measurements at Different Distances 从不同距离的测量结果重构相位物体出口波的复合场
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-11-22 DOI: 10.3103/S1068335624600931
I. A. Artyukov, A. V. Vinogradov, M. V. Gorbunkov, Yu. Ya. Maslova, N. L. Popov
{"title":"Reconstruction of the Complex Field of an Exit Wave of a Phase Object from Measurements at Different Distances","authors":"I. A. Artyukov,&nbsp;A. V. Vinogradov,&nbsp;M. V. Gorbunkov,&nbsp;Yu. Ya. Maslova,&nbsp;N. L. Popov","doi":"10.3103/S1068335624600931","DOIUrl":"10.3103/S1068335624600931","url":null,"abstract":"<p>Improving the efficiency and expanding the scope of application of lensless optics require increasing its reliability in measuring light fields. The paper examines the complex field generated by a phase object, i.e., a lens. It is shown that reliable phase reconstruction is possible using two or more measurements of the intensity distribution at different distances from the object. A combination of a circular diaphragm and a lens located behind it is used as an object.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 10","pages":"386 - 394"},"PeriodicalIF":0.6,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142691924","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
Properties of Magnetoacoustic Waves in Plasma with Heat Release Depending on the Magnetic Field 等离子体中的磁声波特性与磁场的热释放有关
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-11-22 DOI: 10.3103/S1068335624601249
N. E. Molevich, S. Yu. Pichugin, D. S. Riashchikov, D. V. Agapova, D. I. Zavershinskii, E. V. Scoptsova
{"title":"Properties of Magnetoacoustic Waves in Plasma with Heat Release Depending on the Magnetic Field","authors":"N. E. Molevich,&nbsp;S. Yu. Pichugin,&nbsp;D. S. Riashchikov,&nbsp;D. V. Agapova,&nbsp;D. I. Zavershinskii,&nbsp;E. V. Scoptsova","doi":"10.3103/S1068335624601249","DOIUrl":"10.3103/S1068335624601249","url":null,"abstract":"<p>We study the influence of the magnetic field dependence of the heating power on the dispersion properties of plane magnetoacoustic (MA) waves in the solar atmosphere. A dispersion relation is derived for MA waves in a homogeneous heat-releasing fully ionized plasma in the case when the specific heating power depends on the magnetic field strength, density, and temperature. Expressions are found for the phase velocities and decrements (increments) of slow and fast MA waves in the low-frequency and high-frequency approximations. For the conditions of the solar coronal plasma, stability regions of plane MA waves and entropy modes are constructed depending on the properties of the heating source, the propagation angle with respect to the magnetic field, and the plasma beta parameter. Anisotropy of propagation and damping (amplification) of both slow and fast MA waves is shown; this can lead to the observation of such waves in a limited angular sector with respect to the magnetic field, which is typical of the observed global waves in the solar atmosphere.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 10","pages":"419 - 425"},"PeriodicalIF":0.6,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142691989","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
Lean Blowout Limits in Combustion Chambers during Lean CH4‒H2‒Air Mixture Burning 燃烧室在稀薄的 CH4-H2 空气混合物燃烧过程中的稀薄爆破极限
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-11-22 DOI: 10.3103/S1068335624600980
S. S. Matveev, N. I. Gurakov, D. V. Idrisov, S. V. Lukachev, V. N. Azyazov
{"title":"Lean Blowout Limits in Combustion Chambers during Lean CH4‒H2‒Air Mixture Burning","authors":"S. S. Matveev,&nbsp;N. I. Gurakov,&nbsp;D. V. Idrisov,&nbsp;S. V. Lukachev,&nbsp;V. N. Azyazov","doi":"10.3103/S1068335624600980","DOIUrl":"10.3103/S1068335624600980","url":null,"abstract":"<p>The paper proposes a calculation method for determining the lean blowout limit in CH<sub>4</sub>‒H<sub>2</sub>‒air mixtures. The method is validated using the experimentally determined dependence of the excess air coefficient at the moment of lean blowout for different volume fractions of hydrogen content in the methane‒air mixture in a model combustion chamber. It is shown that the mathematical model of combustion of methane‒hydrogen mixtures satisfactorily predicts the boundaries of the concentration limit of combustion by lean blowout and can be used to determine the limits of stable operation of the developed combustion chambers of gas turbine power plants when they are converted to operate with hydrogen-containing mixtures.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 10","pages":"403 - 409"},"PeriodicalIF":0.6,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142691985","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
In Situ Study of the Effect of a Bi Surfactant on the Formation of InGaAs/GaAs Quantum Dots by Molecular Beam Epitaxy 双界面活性剂对分子束外延形成 InGaAs/GaAs 量子点的影响的原位研究
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-11-22 DOI: 10.3103/S1068335624600748
I. P. Kazakov
{"title":"In Situ Study of the Effect of a Bi Surfactant on the Formation of InGaAs/GaAs Quantum Dots by Molecular Beam Epitaxy","authors":"I. P. Kazakov","doi":"10.3103/S1068335624600748","DOIUrl":"10.3103/S1068335624600748","url":null,"abstract":"<p>The formation of InGaAs/GaAs quantum dots by molecular beam epitaxy is studied under the effect of Bi vapor flow on the growth surface at different temperatures of the GaAs substrate. It is shown that Bi acts as a surfactant, lowering the temperature of the formation of quantum dots by about 50°C.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 10","pages":"410 - 415"},"PeriodicalIF":0.6,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142691987","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
Hamiltonian Structure of the Quantum Kinetic Equation 量子动力学方程的哈密顿结构
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-11-22 DOI: 10.3103/S1068335624601018
A. M. Ignatov
{"title":"Hamiltonian Structure of the Quantum Kinetic Equation","authors":"A. M. Ignatov","doi":"10.3103/S1068335624601018","DOIUrl":"10.3103/S1068335624601018","url":null,"abstract":"<p>A Lie‒Poisson bracket for the quantum kinetic equation for the Wigner function of a collisionless plasma is proposed. The first few Casimir invariants are obtained explicitly.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 10","pages":"416 - 418"},"PeriodicalIF":0.6,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142691986","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
Likelihood Equilibria in the Ising Game 伊辛博弈中的可能性均衡
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-11-22 DOI: 10.3103/S1068335624601171
A. V. Leonidov
{"title":"Likelihood Equilibria in the Ising Game","authors":"A. V. Leonidov","doi":"10.3103/S1068335624601171","DOIUrl":"10.3103/S1068335624601171","url":null,"abstract":"<p>A description of static equilibria in the noisy binary choice (Ising) game on complete and random graphs resulting from maximization of the likelihood function of system configurations is presented. An equivalence of such likelihood equilibria to the competitive Bayes–Nash quantal response equilibria in the special case of self-consistent expectations of agents is established. It is shown that the same expectation equilibria can be obtained using the partition function formalism.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 10","pages":"395 - 402"},"PeriodicalIF":0.6,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142691889","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
Gamma-Astronomical Investigations at the Tien Shan High-Altitude Scientific Station of the Lebedev Physical Institute Based on Selection of Extensive Air Showers without Hadronic and Muonic Content 列别杰夫物理研究所天山高空科学站的伽马-天文研究，基于选择不含强子和μ子成分的大范围气流显影
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-11-22 DOI: 10.3103/S1068335624601250
V. A. Ryabov, V. V. Zhukov, V. V. Piskal, S. B. Shaulov, A. L. Shepetov, T. K. Idrisova, T. Kh. Sadykov
{"title":"Gamma-Astronomical Investigations at the Tien Shan High-Altitude Scientific Station of the Lebedev Physical Institute Based on Selection of Extensive Air Showers without Hadronic and Muonic Content","authors":"V. A. Ryabov,&nbsp;V. V. Zhukov,&nbsp;V. V. Piskal,&nbsp;S. B. Shaulov,&nbsp;A. L. Shepetov,&nbsp;T. K. Idrisova,&nbsp;T. Kh. Sadykov","doi":"10.3103/S1068335624601250","DOIUrl":"10.3103/S1068335624601250","url":null,"abstract":"<p>We discuss the first results of and prospects for performing gamma-astronomical investigations in the energy range of 10<sup>12</sup>‒10<sup>17</sup> eV, carried out without application of highly expensive Cherenkov detectors, at the detectors of the Tien Shan high-altitude scientific station. We consider the strategy of using the Tien Shan detector complex as a gamma-astronomy installation: combination of information about the parameters of extensive air showers (EAS’s) provided by the detectors of the shower installation with the data on the direction of EAS axis determined by the detectors of the shower front delay measurement system, as well as a special selection of the EAS events with a small number of muons and a low neutron content and acquisition of information from the gamma-block of the ionization calorimeter. Prospects for upgrading the complex in order to expand the energy range up to gamma-shower energies of 10<sup>18</sup> eV are considered.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 10","pages":"379 - 385"},"PeriodicalIF":0.6,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142691890","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
Thermometry of Spatially Inhomogeneous Methane–Air Flame Using Two-Color Planar Laser-Induced Fluorescence and Coherent Anti-Stokes Raman Scattering Spectroscopy 利用双色平面激光诱导荧光和相干反斯托克斯拉曼散射光谱测量空间不均匀甲烷-空气火焰的温度
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2024-11-05 DOI: 10.3103/S106833562460164X
K. A. Vereshchagin, V. D. Kobtsev, S. A. Kostritsa, D. N. Kozlov, V. V. Smirnov, V. I. Fabelinsky
{"title":"Thermometry of Spatially Inhomogeneous Methane–Air Flame Using Two-Color Planar Laser-Induced Fluorescence and Coherent Anti-Stokes Raman Scattering Spectroscopy","authors":"K. A. Vereshchagin,&nbsp;V. D. Kobtsev,&nbsp;S. A. Kostritsa,&nbsp;D. N. Kozlov,&nbsp;V. V. Smirnov,&nbsp;V. I. Fabelinsky","doi":"10.3103/S106833562460164X","DOIUrl":"10.3103/S106833562460164X","url":null,"abstract":"<p>Using two-color planar laser-induced fluorescence (PLIF) of OH hydroxyl radicals excited at two wavelengths and coherent anti-Stokes Raman scattering (CARS) spectroscopy of H<sub>2</sub> molecules in a laboratory burner, we have measured spatial temperature distributions in the central section of a stationary atmospheric laminar flame of a methane–air mixture with partial preliminary mixing of the components. The results of a comparative analysis of the data on two-dimensional PLIF and point CARS thermometry of a spatially inhomogeneous flame are presented, and possibilities of complementary application of these methods for diagnostics are shown.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"51 6 supplement","pages":"S489 - S498"},"PeriodicalIF":0.6,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142579444","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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