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Plasma Emission Spectrum Formed during Micropoint Explosion
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-04-03 DOI: 10.3103/S1068335624601973
E. V. Oreshkin
{"title":"Plasma Emission Spectrum Formed during Micropoint Explosion","authors":"E. V. Oreshkin","doi":"10.3103/S1068335624601973","DOIUrl":"10.3103/S1068335624601973","url":null,"abstract":"<p>Explosive emission processes are of great importance in electrodynamic and accelerating structures exposed to high-power radio-frequency electromagnetic waves. These processes emerge due to the explosion of microprotrusions on the surface of electrodes. The paper presents the results of radiation magnetohydrodynamic calculations of the explosion of copper conductors under conditions similar to those that arise during the explosion of microprotrusions. This means that the current density is about 10<sup>9</sup> A/cm<sup>2</sup>. Quasi-stationary and radio-frequency explosion regimes are considered. It turns out that in both cases the maximum of the spectral distribution lies in the ultraviolet range. However, the radiation power that comes out of the conductor in the radio frequency regime is almost two orders of magnitude less than that in the quasi-stationary regime.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"52 2","pages":"66 - 71"},"PeriodicalIF":0.6,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761782","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
Optoelectrical Properties of Titanium Dioxide Microscrolls Doped with Metal‒Carbon Complexes
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-04-03 DOI: 10.3103/S1068335624602449
V. D. Samyshkin, D. N. Bukharov, A. O. Kucherik, A. F. Lelekova
{"title":"Optoelectrical Properties of Titanium Dioxide Microscrolls Doped with Metal‒Carbon Complexes","authors":"V. D. Samyshkin,&nbsp;D. N. Bukharov,&nbsp;A. O. Kucherik,&nbsp;A. F. Lelekova","doi":"10.3103/S1068335624602449","DOIUrl":"10.3103/S1068335624602449","url":null,"abstract":"<p>We report the results of a study of optoelectric properties of thin films consisting of titanium dioxide microscrolls doped colloidal systems containing linear carbon chains with anchor ends in the form of metal nanoparticles. The electric current generation in such films during irradiation with optical radiation is investigated. The presence of developed optoelectric properties due to the generated structure of the microscrolls is demonstrated. In the approximation of a Schottky photodiode, a model for calculating the photocurrent in the structures in question is proposed. The integral quantum efficiency is estimated and a conclusion is made that the considered samples are promising materials for solar cells.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"52 2","pages":"62 - 65"},"PeriodicalIF":0.6,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761654","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
Evaluation of Neutron Field Parameters at the VITA Facility Using Geant4 Simulation
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-04-03 DOI: 10.3103/S1068335624602371
M. Yu. Azarkin, I. N. Zavestovskaya, M. R. Kirakosyan, D. S. Petrunya, D. A. Kasatov, V. D. Konovalova, S. Yu. Taskaev
{"title":"Evaluation of Neutron Field Parameters at the VITA Facility Using Geant4 Simulation","authors":"M. Yu. Azarkin,&nbsp;I. N. Zavestovskaya,&nbsp;M. R. Kirakosyan,&nbsp;D. S. Petrunya,&nbsp;D. A. Kasatov,&nbsp;V. D. Konovalova,&nbsp;S. Yu. Taskaev","doi":"10.3103/S1068335624602371","DOIUrl":"10.3103/S1068335624602371","url":null,"abstract":"<p>Parameters of the neutron field generated at the VITA (Vacuum Insulated Tandem Accelerator) installation are assessed using Monte Carlo simulation in the Geant4 software package. A detailed model of the target section of the installation is developed, including the output accelerator tube, frontal lithium target for neutron generation, backplate cooling system, and neutron moderator system. The simulation makes it possible to obtain the energy and spatial distributions of the neutron flux intensities in the configuration intended for irradiation of small biological objects at a proton energy of 2.05 MeV. It is shown that the obtained calculated values of the neutron flux intensities correspond to the target values, providing acceptable time intervals for irradiating biological objects. Moreover, the transverse profiles of the simulated neutron field are consistent with the experimental data and preliminary theoretical expectations. The developed model can be used for dose planning in experiments on irradiation of small biological objects in vitro and in vivo and for further optimization of the neutron beam formation system to increase a therapeutic index in neutron capture therapy.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"52 2","pages":"72 - 77"},"PeriodicalIF":0.6,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761765","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
Study of Laser Transfer Regimes to Increase the Efficiency of Application of Antibacterial Silver Nanoparticles
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-04-03 DOI: 10.3103/S1068335624602462
A. A. Nastulyavichus, E. R. Tolordava, E. V. Ulturgasheva, S. N. Shelygina, S. P. Babina, I. N. Saraeva, S. I. Kudryashov
{"title":"Study of Laser Transfer Regimes to Increase the Efficiency of Application of Antibacterial Silver Nanoparticles","authors":"A. A. Nastulyavichus,&nbsp;E. R. Tolordava,&nbsp;E. V. Ulturgasheva,&nbsp;S. N. Shelygina,&nbsp;S. P. Babina,&nbsp;I. N. Saraeva,&nbsp;S. I. Kudryashov","doi":"10.3103/S1068335624602462","DOIUrl":"10.3103/S1068335624602462","url":null,"abstract":"<p>The paper examines the antibacterial effect of silver nanoparticles applied by laser-induced forward transfer to infected pig skin as a function of the transfer regime and film thickness. Optimal regime of nanoparticle application are found, with the minimum inhibitory concentration against gram-positive bacteria Staphylococcus aureus being about 3 μg/cm<sup>2</sup>.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"52 2","pages":"82 - 87"},"PeriodicalIF":0.6,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761786","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
Optimal Composition of the Ar‒He Mixture of Atmospheric Pressure for Production of Metastable Argon Atoms in a Nanosecond Repetitively Pulsed Discharge
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-04-03 DOI: 10.3103/S1068335624601882
M. V. Zagidullin, P. A. Mikheyev, R. A. Kuramshin, A. D. Dvornikov
{"title":"Optimal Composition of the Ar‒He Mixture of Atmospheric Pressure for Production of Metastable Argon Atoms in a Nanosecond Repetitively Pulsed Discharge","authors":"M. V. Zagidullin,&nbsp;P. A. Mikheyev,&nbsp;R. A. Kuramshin,&nbsp;A. D. Dvornikov","doi":"10.3103/S1068335624601882","DOIUrl":"10.3103/S1068335624601882","url":null,"abstract":"<p>Use is made of the 0D kinetic model to calculate the optimal composition of the Ar‒He mixture of atmospheric pressure in a nanosecond repetitively pulsed discharge (NRPD) generating excited argon atoms Ar* at an average density of ~10<sup>13</sup> cm<sup>–3</sup> over the period. The optimal argon content is found, at which the minimum, reduced electric field amplitude <i>E</i>/<i>N</i> dependent on the NRPD parameters is required. In particular, the optimal argon content at plasma temperatures of 300 and 700 K is found to be ~0.3% and ~1%, respectively. The optimal argon content is practically independent of the pulse duration, pulse shape, interelectrode distance, and content of stray quenching impurities [up to ~(0.5–5) × 10<sup>‒2</sup> Torr of atmospheric gases]. Heat release in the discharge is calculated as a function of the composition of the Ar‒He mixture.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"52 2","pages":"48 - 55"},"PeriodicalIF":0.6,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761652","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-Vivo Studies of Wound Healing Properties of Antibacterial Copper Nanoparticles
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-04-03 DOI: 10.3103/S1068335624602450
A. A. Nastulyavichus, E. R. Tolordava, E. V. Ulturgasheva, S. N. Shelygina, S. P. Babina, I. N. Saraeva, S. I. Kudryashov
{"title":"In-Vivo Studies of Wound Healing Properties of Antibacterial Copper Nanoparticles","authors":"A. A. Nastulyavichus,&nbsp;E. R. Tolordava,&nbsp;E. V. Ulturgasheva,&nbsp;S. N. Shelygina,&nbsp;S. P. Babina,&nbsp;I. N. Saraeva,&nbsp;S. I. Kudryashov","doi":"10.3103/S1068335624602450","DOIUrl":"10.3103/S1068335624602450","url":null,"abstract":"<p>The rate of wound healing on white laboratory mice BALB/C was assessed after application of antibacterial copper nanoparticles with a surface mass density of ≈30 μg/cm<sup>2</sup> by laser-induced forward transfer from a 100-nm thick copper film. For comparison, a group of mice with untreated wounds was used as a control group. As a result, copper nanoparticles were shown to have a wound-healing effect without causing harm to the mice themselves.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"52 2","pages":"88 - 94"},"PeriodicalIF":0.6,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761787","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
Elemental Boron-10 Nanoparticles Synthesized by Laser Fragmentation for Boron Neutron Capture Therapy: In Vitro Experiments
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-04-03 DOI: 10.3103/S1068335624602541
A. I. Kasatova, K. S. Kuzmina, D. A. Kasatov, E. V. Barmina, K. O. Aiyyzhy, P. A. Kotelnikova, M. S. Grigoryeva, D. S. Petrunya, E. L. Zavjalov, S. Yu. Taskaev, S. M. Deyev, I. N. Zavestovskaya
{"title":"Elemental Boron-10 Nanoparticles Synthesized by Laser Fragmentation for Boron Neutron Capture Therapy: In Vitro Experiments","authors":"A. I. Kasatova,&nbsp;K. S. Kuzmina,&nbsp;D. A. Kasatov,&nbsp;E. V. Barmina,&nbsp;K. O. Aiyyzhy,&nbsp;P. A. Kotelnikova,&nbsp;M. S. Grigoryeva,&nbsp;D. S. Petrunya,&nbsp;E. L. Zavjalov,&nbsp;S. Yu. Taskaev,&nbsp;S. M. Deyev,&nbsp;I. N. Zavestovskaya","doi":"10.3103/S1068335624602541","DOIUrl":"10.3103/S1068335624602541","url":null,"abstract":"<p>Elemental boron-10 nanoparticles synthesized by laser fragmentation of micropowder in isopropanol are used for the first time as a boron-containing agent for boron neutron capture therapy. The study is conducted on human cell cultures U87, BT474, and BJ-5TA. It is found that these nanoparticles are nontoxic to all three cell cultures at boron-10 concentrations required for successful boron neutron capture therapy. The cell cultures are pre-incubated with nanoparticles and then irradiated for 30 min with a beam of epithermal neutrons generated by the VITA accelerator source (BINP SB RAS, Novosibirsk). Using in vitro study results (MTT assay and clonogenic analysis), an enhancement of the therapeutic effect of boron neutron capture therapy is observed.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"52 2","pages":"95 - 102"},"PeriodicalIF":0.6,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761763","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 Method for TiO2 Particle Detection in Plastic
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-04-03 DOI: 10.3103/S1068335624602383
D. F. Aminev, E. E. Onishchenko, S. I. Chentsov
{"title":"New Method for TiO2 Particle Detection in Plastic","authors":"D. F. Aminev,&nbsp;E. E. Onishchenko,&nbsp;S. I. Chentsov","doi":"10.3103/S1068335624602383","DOIUrl":"10.3103/S1068335624602383","url":null,"abstract":"<p>Raman scattering and photoluminescence techniques are used to study polystyrene containing TiO<sub>2</sub> (the white dye pigment). It is shown that the spectral features of TiO<sub>2</sub> emission, caused by the vanadium intrinsic impurity in TiO<sub>2</sub>, can be used as a luminescent marker that allows the presence of TiO<sub>2</sub> particles in plastic to be determined.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"52 2","pages":"78 - 81"},"PeriodicalIF":0.6,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761785","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
Destructive Quantum Interference in Bicyclic Conjugated Hydrocarbons
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-04-03 DOI: 10.3103/S1068335624602322
N. M. Shubin, A. A. Gorbatsevich
{"title":"Destructive Quantum Interference in Bicyclic Conjugated Hydrocarbons","authors":"N. M. Shubin,&nbsp;A. A. Gorbatsevich","doi":"10.3103/S1068335624602322","DOIUrl":"10.3103/S1068335624602322","url":null,"abstract":"<p>We theoretically study coherent transport of charge carriers in molecular conductors based on bicyclic conjugated hydrocarbons. In the case of electrodes attached to the same cycle, within the framework of the Huckel model (the tight-binding model) without taking into account the electron-electron interaction, an analytical expression for the numerator of the transmission coefficient is derived, which zeroes determine energies of antiresonances. Analysis of this expression allowed us to formulate a relatively simple and clear rule for determining the presence/absence of destructive quantum interference near the Fermi energy, which, in essence, comes down to counting the number of atoms in the cycles and their mutual arrangement, as well as their arrangement relative to the electrodes. In particular, the proposed model correctly agrees with the results of numerical simulation and experiment for the azulene molecule, which did not fit into the previously proposed similar schematic rules.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"52 2","pages":"56 - 61"},"PeriodicalIF":0.6,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761655","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-Color Picosecond Raman Laser on Water with Multiple Temporal Compression of the Stokes Pulse in a Collimated Beam
IF 0.6 4区 物理与天体物理
Bulletin of the Lebedev Physics Institute Pub Date : 2025-04-03 DOI: 10.3103/S1068335624602498
S. M. Pershin, M. Ya. Grishin, V. N. Lednev, V. A. Orlovich, V. A. Zavozin, E. V. Shashkov, G. A. Boldin
{"title":"Two-Color Picosecond Raman Laser on Water with Multiple Temporal Compression of the Stokes Pulse in a Collimated Beam","authors":"S. M. Pershin,&nbsp;M. Ya. Grishin,&nbsp;V. N. Lednev,&nbsp;V. A. Orlovich,&nbsp;V. A. Zavozin,&nbsp;E. V. Shashkov,&nbsp;G. A. Boldin","doi":"10.3103/S1068335624602498","DOIUrl":"10.3103/S1068335624602498","url":null,"abstract":"<p>For the first time to our knowledge, we report a 10-fold temporal compression of stimulated Raman scattering (SRS) pulses in bulk double distilled water in a 30-cm long cuvette pumped by a collimated beam of a picosecond Nd<sup>3+</sup>:YAP laser (60 ps, 540 nm). The effect of the pump pulse forerunning by the SRS pulse due to group velocity mismatch and a large red shift of the Stokes component of SRS pulses in water on the Stokes pulse temporal compression coefficient is discussed.</p>","PeriodicalId":503,"journal":{"name":"Bulletin of the Lebedev Physics Institute","volume":"52 2","pages":"43 - 47"},"PeriodicalIF":0.6,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143761653","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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