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Method for Determining the Configuration of a Protective Film at Numerical Simulation of Pulsation Modes of Convective-Film Coolings 在对流膜冷却脉动模式数值模拟中确定保护膜配置的方法
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2024-09-27 DOI: 10.1134/S1063784224070478
A. L. Tukmakov, A. A. Akhunov, N. A. Tukmakova, V. V. Kharkov
{"title":"Method for Determining the Configuration of a Protective Film at Numerical Simulation of Pulsation Modes of Convective-Film Coolings","authors":"A. L. Tukmakov,&nbsp;A. A. Akhunov,&nbsp;N. A. Tukmakova,&nbsp;V. V. Kharkov","doi":"10.1134/S1063784224070478","DOIUrl":"10.1134/S1063784224070478","url":null,"abstract":"<p>Presented is a method of determining the configuration of a protective film during numerical modeling of systems convective-film cooling on the example of double-sided flow around the plate with high-temperature and cooling flows communicating through an inclined slit channel that connects the regions cooling and high-temperature gas flow. Gas dynamic field calculations were performed for both of the plate side, and the configuration of the cooling film in the pulsating supply of the cooling film is described air.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 7","pages":"2155 - 2162"},"PeriodicalIF":1.1,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414443","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
Development of a Flexible Thin-Film Radio-Absorbing Structure for UHF and SHF Microwave Range 开发适用于超高频和甚高频微波范围的柔性薄膜无线电吸收结构
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2024-09-27 DOI: 10.1134/S1063784224070107
V. Yu. Buzko, A. I. Goryachko, S. N. Ivanin, I. Yu. Shutkin
{"title":"Development of a Flexible Thin-Film Radio-Absorbing Structure for UHF and SHF Microwave Range","authors":"V. Yu. Buzko,&nbsp;A. I. Goryachko,&nbsp;S. N. Ivanin,&nbsp;I. Yu. Shutkin","doi":"10.1134/S1063784224070107","DOIUrl":"10.1134/S1063784224070107","url":null,"abstract":"<p>A broadband printed thin-layer radio absorbing structure based on an array of coupled dipole antennas has been developed and created. The resulting material can be used to solve the problems of shielding electromagnetic waves and reduce the level of electromagnetic emission from various devices in the 4–7 GHz frequency range, as well as to create building radio shielding materials.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 7","pages":"1933 - 1937"},"PeriodicalIF":1.1,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414507","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
Dust Particles Selection in Plasma-Forming Gases with Different Ionization Potentials 不同电离电位等离子体形成气体中尘埃粒子的选择
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2024-09-27 DOI: 10.1134/S1063784224070120
E. S. Dzlieva, V. Yu. Karasev, L. A. Novikov, S. I. Pavlov, M. S. Golubev, I. Ch. Mashek
{"title":"Dust Particles Selection in Plasma-Forming Gases with Different Ionization Potentials","authors":"E. S. Dzlieva,&nbsp;V. Yu. Karasev,&nbsp;L. A. Novikov,&nbsp;S. I. Pavlov,&nbsp;M. S. Golubev,&nbsp;I. Ch. Mashek","doi":"10.1134/S1063784224070120","DOIUrl":"10.1134/S1063784224070120","url":null,"abstract":"<p>The sizes of dust particles capable of levitating in dust traps in striations in a glow discharge in all inert gases are quantitatively determined for the same discharge parameters. A more than twofold decrease in the particle size was established upon passing from the gas with the maximum ionization potential (He) to Xe. The dependence found in the experiment is interpreted from the point of view of the conditions of particle levitation. It is shown that in gases with a low ionization potential in the balance of forces, the ion drag force exceeds the force of gravity, while the absolute values of the forces decrease with decreasing particle size. The discovered effect can be used for fine trapping of dust particles in plasma traps.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 7","pages":"1945 - 1949"},"PeriodicalIF":1.1,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414525","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 the Applicability of the Universal Lindhard Function for Describing the Scattering Cross Sections of Atomic Particles 论通用林哈德函数在描述原子粒子散射截面时的适用性
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2024-09-27 DOI: 10.1134/S106378422407003X
P. Yu. Babenko, A. N. Zinoviev
{"title":"On the Applicability of the Universal Lindhard Function for Describing the Scattering Cross Sections of Atomic Particles","authors":"P. Yu. Babenko,&nbsp;A. N. Zinoviev","doi":"10.1134/S106378422407003X","DOIUrl":"10.1134/S106378422407003X","url":null,"abstract":"<p>It is shown that the application of the universal Lindhard function for calculating the scattering cross section of atomic particles is, as a rule, limited to the region of scattering angles less than 20°. The results obtained for various popular interaction potentials are compared with the available experimental data. It is shown that the presence of inelastic channels in scattering leads to the appearance of additional maxima in the scattering cross section. Recommendations are given on the use of the universal Lindhard function to describe quasi-elastic scattering in the region η = εsin(θ/2) &gt; 0.01, ε is the reduced impact energy, θ is the scattering angle. At high energies, the scattering is well described by screened Coulomb potentials, and the application of the Lindhard function provides an accuracy of 10% for calculating the scattering cross sections.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 7","pages":"1886 - 1892"},"PeriodicalIF":1.1,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414461","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
Effect of the Small-Scale Field on the Heating of the Polar Cap of the Radio Pulsar J0901-4046 小尺度场对射电脉冲星 J0901-4046 极冠加热的影响
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2024-09-27 DOI: 10.1134/S1063784224070053
D. P. Barsukov, I. K. Morozov, A. N. Popov
{"title":"Effect of the Small-Scale Field on the Heating of the Polar Cap of the Radio Pulsar J0901-4046","authors":"D. P. Barsukov,&nbsp;I. K. Morozov,&nbsp;A. N. Popov","doi":"10.1134/S1063784224070053","DOIUrl":"10.1134/S1063784224070053","url":null,"abstract":"<div><p>The effect of a small-scale magnetic field on the heating of the polar cap of the pulsar J0901-4046 by the reverse current of positrons is considered. It is shown that under some configurations of a small-scale field, the luminosity of its polar cap can reach 10<sup>25</sup> erg/s.</p></div>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 7","pages":"1898 - 1900"},"PeriodicalIF":1.1,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414495","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
Development and Generalization of the Method of Reflections in Problems of Electrostatics and Thermal Conductivity of Plane-Layered Media 平面介质的静电和导热问题中反射法的发展和推广
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2024-09-27 DOI: 10.1134/S1063784224070351
A. B. Petrin
{"title":"Development and Generalization of the Method of Reflections in Problems of Electrostatics and Thermal Conductivity of Plane-Layered Media","authors":"A. B. Petrin","doi":"10.1134/S1063784224070351","DOIUrl":"10.1134/S1063784224070351","url":null,"abstract":"<p>The method of mirror reflections of electrostatics for a point charge located next to a plane-layered medium consisting of a single film on a dielectric half-space is formulated. The method is generalized to the case of an arbitrary system of charges. The proposed approach is applied to mathematically similar problems of electrostatics and stationary heat conduction of plane-layered media. In particular, the problems of finding distributions of the electrostatic potential around a conducting sphere, an ellipsoid of revolution and a drop-shaped body located near the dielectric film on the dielectric half-space. It is shown how to apply the results obtained for electrostatic problems to similar problems of finding the temperature distribution of uniformly heated bodies of the same geometry located near a heat-conducting film in a heat-conducting half-space.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 7","pages":"2079 - 2092"},"PeriodicalIF":1.1,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414670","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
Integral Estimating an Impact Peril by Sequence of Ultra-Wideband Electromagnetic Pulses on Human Organism 综合估算超宽带电磁脉冲序列对人体的影响危险性
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2024-09-27 DOI: 10.1134/S1063784224070491
V. G. Usychenko, L. N. Sorokin
{"title":"Integral Estimating an Impact Peril by Sequence of Ultra-Wideband Electromagnetic Pulses on Human Organism","authors":"V. G. Usychenko,&nbsp;L. N. Sorokin","doi":"10.1134/S1063784224070491","DOIUrl":"10.1134/S1063784224070491","url":null,"abstract":"<p>Impact peril for warm-blooded organisms produced by a sequence of ultra-wideband electromagnetic sub-nanosecond pulses, used in various scientific and technological applications, is assessed by calculation methods of radiophysics and classical mechanics. Threshold values of the sequence parameters whose long time excess can be perilous for human have been determined.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 7","pages":"2170 - 2174"},"PeriodicalIF":1.1,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414513","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
Strengthening Polycrystalline Ice with SiO2 Nanoparticles 用二氧化硅纳米颗粒强化多晶硅冰
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2024-09-27 DOI: 10.1134/S1063784224070144
Yu. I. Golovin, A. A. Samodurov, V. V. Rodaev, A. I. Tyurin, D. Yu. Golovin, S. S. Razlivalova, V. M. Buznik
{"title":"Strengthening Polycrystalline Ice with SiO2 Nanoparticles","authors":"Yu. I. Golovin,&nbsp;A. A. Samodurov,&nbsp;V. V. Rodaev,&nbsp;A. I. Tyurin,&nbsp;D. Yu. Golovin,&nbsp;S. S. Razlivalova,&nbsp;V. M. Buznik","doi":"10.1134/S1063784224070144","DOIUrl":"10.1134/S1063784224070144","url":null,"abstract":"<p>The paper presents the results of ice strengthening by means of ultrafme silica nanoparticles introduced to distilled water prior to its crystallization. Stable SiO<sub>2</sub> particles suspensions with concentrations ranging from 0.003 to 5 wt % have been prepared, and nanoparticles size distribution and zeta potential have been monitored in them. Both values remain almost constant for a week. Concentration dependences of maximal stress, Young’s modulus and inelastic deformation at and after reaching peak stress in uniaxial compression test have been studied. The highest rate of change with the particles concentration for these properties is between 0.01 and 1 wt % while beyond the above range the concentration sensitivity is much weaker. The strongest effect of silica concentration is on inelastic deformation, and the weakest effect is on Young’s modulus. Concentration sensitivity of the properties has been estimated by the power index of the best fitted power function for each of the property. Dependence of strength upon average grain size, that diminishes sixfold with growing concentration, is well approximated by power function also, but with negative power index –1/2. Additive constant in this dependence is found to be much lower than the strength of large grain pure ice and is close to zero within experiment accuracy. Hence, the strength of studied polycrystalline ice and ice composites is limited by the nucleation and subsequent propagation of Griffiths cracks with characteristic length proportional to average size of ice grain.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 7","pages":"1956 - 1966"},"PeriodicalIF":1.1,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414666","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
Control of Fluid Flow Movement in Porous Medium with NMR-Relaxometry Method 用核磁共振再axometry 方法控制多孔介质中的流体流动
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2024-09-27 DOI: 10.1134/S1063784224070260
V. V. Maikov, S. V. Zhakov, I. V. Byzov, A. A. Mysik
{"title":"Control of Fluid Flow Movement in Porous Medium with NMR-Relaxometry Method","authors":"V. V. Maikov,&nbsp;S. V. Zhakov,&nbsp;I. V. Byzov,&nbsp;A. A. Mysik","doi":"10.1134/S1063784224070260","DOIUrl":"10.1134/S1063784224070260","url":null,"abstract":"<p>The possibility of fixing velocities of fluid motion in model porous medium (glass beads) by measuring the transverse relaxation time <i>T</i><sub>2</sub> by spin echo method is shown. The magnetic field gradient arising due to the difference in the magnetic permeability of the fluid and the porous medium causes a decrease in the average time <i>T</i><sub>2</sub>, which makes it possible to fix the fluid motion in the absence of an external magnetic field gradient. The addition of magnetic nanoparticles to the fluid under study increases the dependence of <i>T</i><sub>2</sub> on fluid velocity and increases the sensitivity in determining the permeability of porous medium by NMR-relaxometry.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 7","pages":"2033 - 2036"},"PeriodicalIF":1.1,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414371","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
Low-Temperature Radiation-Induced Conductivity of Polystyrene under the Action of Low-Energy Electrons 低能电子作用下聚苯乙烯的低温辐射诱导电导率
IF 1.1 4区 物理与天体物理
Technical Physics Pub Date : 2024-09-27 DOI: 10.1134/S1063784224070326
I. R. Mullakhmetov, V. S. Saenko, A. P. Tyutnev, E. D. Pozhidaev
{"title":"Low-Temperature Radiation-Induced Conductivity of Polystyrene under the Action of Low-Energy Electrons","authors":"I. R. Mullakhmetov,&nbsp;V. S. Saenko,&nbsp;A. P. Tyutnev,&nbsp;E. D. Pozhidaev","doi":"10.1134/S1063784224070326","DOIUrl":"10.1134/S1063784224070326","url":null,"abstract":"<p>A technique has been developed and, for the first time, sufficiently complete data on the radiation-induced conductivity (RIC) of polystyrene (PS) at a temperature of 79 K, close to the boiling point of liquid nitrogen (77 K). RIC has been studied under pulsed and continuous exposure to electrons with an energy of 50 keV. It is shown that the RIC of PS at a temperature of 79 K, as well as at room temperature, determined by the sum of two components: prompt and delayed. Both components at 79 K are much smaller than at 298 K. The total signal falls off by a factor of 40, while the delayed component falls off by a factor of almost 200, and the prompt component dominant in the RIC signal. The possibility of the occurrence of electrostatic discharges (ESD) in PS with decreasing temperature was studied. It has been shown that PS, which is capable of resisting the occurrence of ESD at room temperature, at 79 K passes into the category of materials in which ESD is possible.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"69 7","pages":"2066 - 2070"},"PeriodicalIF":1.1,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142414382","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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