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Jet Electrical Discharge with a Liquid Plasma-Forming Medium in Interaction with Aluminum 液体等离子体形成介质与铝相互作用的射流放电
IF 0.8 4区 物理与天体物理
Technical Physics Letters Pub Date : 2026-08-15 DOI: 10.1134/S1063785026700604
Al. F. Gaisin, R. R. Kayumov, A. M. Shakirov, I. T. Fakhrutdinova
{"title":"Jet Electrical Discharge with a Liquid Plasma-Forming Medium in Interaction with Aluminum","authors":"Al. F. Gaisin,&nbsp;R. R. Kayumov,&nbsp;A. M. Shakirov,&nbsp;I. T. Fakhrutdinova","doi":"10.1134/S1063785026700604","DOIUrl":"10.1134/S1063785026700604","url":null,"abstract":"<p>The results of a study of a jet electrical discharge with a liquid plasma-forming medium interacting with an aluminum surface are presented. The discharge was realized in the “jet anode–metal cathode” configuration at atmospheric pressure. The electrical regimes of discharge formation, spatial structure of the plasma channel, spectral characteristics, and thermal parameters were investigated. Two characteristic geometries of the plasma channel were identified: a longitudinal discharge developing along the electrolyte jet and a near-surface conical luminous plasma torch at the jet–metal interface. It is shown that an electrochemical regime is observed, at voltages of about 200 V whereas the discharge transitions to an impulse-plasma regime at voltages around 700 V. According to optical emission spectroscopy data, the plasma composition was determined and the electron concentration was estimated using Stark broadening of hydrogen spectral lines.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 6","pages":"314 - 316"},"PeriodicalIF":0.8,"publicationDate":"2026-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751921","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
Modeling of Liquid Flow in Plasma-Electrolyte Surface-Treatment Systems 等离子体-电解质表面处理系统中液体流动的建模
IF 0.8 4区 物理与天体物理
Technical Physics Letters Pub Date : 2026-08-15 DOI: 10.1134/S1063785026700768
L. N. Kashapov, Yu. I. Pushkarev
{"title":"Modeling of Liquid Flow in Plasma-Electrolyte Surface-Treatment Systems","authors":"L. N. Kashapov,&nbsp;Yu. I. Pushkarev","doi":"10.1134/S1063785026700768","DOIUrl":"10.1134/S1063785026700768","url":null,"abstract":"<p>The article is devoted to the study of qualitative patterns of deformation of the phase interface during the impact of a liquid jet on a solid body in the context of modeling an installation with jet liquid and metal electrodes. Based on analysis of the physical properties of the liquid (viscosity, surface tension, density), the contact angle at the liquid–metal interface, and the flow velocity, the main types of liquid surface configurations in the contact zone were identified. The relationship between the shape of the phase boundary, the contact angle, and the initial velocity of the liquid has been established.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 6","pages":"302 - 306"},"PeriodicalIF":0.8,"publicationDate":"2026-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751923","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
Physical Modeling of Lightning Current Spreading Processes in Soil with High Resistivity 雷电电流在高电阻率土壤中传播过程的物理模拟
IF 0.8 4区 物理与天体物理
Technical Physics Letters Pub Date : 2026-08-15 DOI: 10.1134/S1063785026600432
O. S. Belova, S. Yu. Kazantsev, N. Yu. Lysov, G. P. Paimtsev, A. G. Temnikov, L. L. Chernensky
{"title":"Physical Modeling of Lightning Current Spreading Processes in Soil with High Resistivity","authors":"O. S. Belova,&nbsp;S. Yu. Kazantsev,&nbsp;N. Yu. Lysov,&nbsp;G. P. Paimtsev,&nbsp;A. G. Temnikov,&nbsp;L. L. Chernensky","doi":"10.1134/S1063785026600432","DOIUrl":"10.1134/S1063785026600432","url":null,"abstract":"<p>Physical modeling of the processes of spreading lightning pulse current in soil with high specific resistance was performed using the GROZA experimental and measuring complex. To record discharge processes in the soil layer, model soil in the form of glass spheres was used. Simultaneously with photographic recording of discharge processes, a current signal from a grounded electrode was recorded, which will allow us to link the fact of a discharge process in the soil, processes on the ground part of the electrode affected by the discharge from an artificial thundercloud, and an oscillogram of the current pulse for further identification of processes in experiments with opaque soil.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 5","pages":"208 - 213"},"PeriodicalIF":0.8,"publicationDate":"2026-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752100","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
Spraying of Liquid Electrolyte at the Plasma–Liquid Interface during Gas-Discharge Combustion 气体放电燃烧过程中等离子体-液界面处液体电解质的喷射
IF 0.8 4区 物理与天体物理
Technical Physics Letters Pub Date : 2026-08-15 DOI: 10.1134/S1063785026700732
L. N. Kashapov, R. N. Kashapov, N. F. Kashapov, Yu. I. Pushkarev
{"title":"Spraying of Liquid Electrolyte at the Plasma–Liquid Interface during Gas-Discharge Combustion","authors":"L. N. Kashapov,&nbsp;R. N. Kashapov,&nbsp;N. F. Kashapov,&nbsp;Yu. I. Pushkarev","doi":"10.1134/S1063785026700732","DOIUrl":"10.1134/S1063785026700732","url":null,"abstract":"<p>The mechanism of microspraying of an aqueous electrolyte during combustion of a gas discharge at the plasma–liquid interface is considered using the example of a sodium liquid-glass solution. It is shown that the formation of aerosol droplets is caused by the combined action of electrodynamic and thermal factors: deformation of the meniscus and emission of a jet under the action of electrical pressure and ionic wind, as well as local overheating of the surface layer, leading to bubble dynamics and pulsed fragmentation of the liquid. Based on the results of high-speed video recording and analysis of the aerosol fraction, spray modes (droplet jet, stable jet, and burst) were identified and the conditions for their transitions with changes in the voltage and electrical conductivity of the solution were determined. In a stable jet mode, intense generation of droplets with a diameter of about 5–30 µm is achieved at emission frequencies of up to ~10<sup>2</sup> Hz. An increase in conductivity leads to an increase in droplet size and an increase in discharge instability, up to and including breakdown events. It is shown that the drying of sprayed droplets of liquid-glass solution is accompanied by the formation of dispersed particles of silicon dioxide, including hollow-shell microspheres, which emphasizes the key role of the spraying stage in the subsequent synthesis of the solid phase. The obtained results clarify the physical picture of electrolyte spraying in a discharge and can be used to optimize plasma-chemical processes for obtaining dispersed materials and aerosol plasma processing.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 6","pages":"332 - 335"},"PeriodicalIF":0.8,"publicationDate":"2026-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751845","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 and Optical Characterization of Single Point Diamond-Turned Metallic Mirrors for the TACTIC Telescope 战术望远镜单点金刚石转金属反射镜的仿真与光学特性研究
IF 0.8 4区 物理与天体物理
Technical Physics Letters Pub Date : 2026-08-15 DOI: 10.1134/S1063785026600328
Vrishali Murudkar, K. Chanchalani, C. Borwankar, V. K. Dhar, N. Chouhan, N. K. Agarwal, M. Kothari, N. Kumar, P. Marandi, K. K. Gour, J. Hariharan, C. P. Kushwaha, K. K. Yadav
{"title":"Simulation and Optical Characterization of Single Point Diamond-Turned Metallic Mirrors for the TACTIC Telescope","authors":"Vrishali Murudkar,&nbsp;K. Chanchalani,&nbsp;C. Borwankar,&nbsp;V. K. Dhar,&nbsp;N. Chouhan,&nbsp;N. K. Agarwal,&nbsp;M. Kothari,&nbsp;N. Kumar,&nbsp;P. Marandi,&nbsp;K. K. Gour,&nbsp;J. Hariharan,&nbsp;C. P. Kushwaha,&nbsp;K. K. Yadav","doi":"10.1134/S1063785026600328","DOIUrl":"10.1134/S1063785026600328","url":null,"abstract":"<p>The TACTIC (TeV Atmospheric Cherenkov Telescope with Imaging Camera) is a 4 m imaging atmospheric Cherenkov telescope designed for very high-energy (VHE) gamma-ray observations and has been operational at Mount Abu, India, for over two decades. The telescope’s light collector has recently been upgraded to a tessellated structure comprising 34 spherical mirrors fabricated from single-point diamond-turned aluminum alloy (Al 6061-T6). Each mirror has a diameter of 600 mm and a focal length of ~4000 mm. Previously, the telescope employed glass mirrors of the same diameter, which required frequent aluminization due to degradation of reflectivity under prolonged atmospheric exposure. \u0000In this work, we present qualification studies of the diamond-turned metallic mirrors to evaluate their optical performance and environmental durability for Cherenkov light collection in the 300–700 nm wavelength range. The characterization includes spot size measurements using the 2f method, surface roughness evaluation, reflectivity assessment, and water ingress testing. Additionally, ray-tracing simulations were performed using ROBAST to estimate the point-spread function (PSF) for all 34 mirrors of the TACTIC telescope. The results demonstrate that the developed mirrors satisfy the required specifications and are suitable for long-term operation under site-specific environmental conditions.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 6","pages":"361 - 369"},"PeriodicalIF":0.8,"publicationDate":"2026-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751846","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
Specific Energy Characteristics of the Plasma-Electrolyte Process for Producing Hollow SiO2 Particles 等离子体-电解质法制备空心SiO2颗粒的比能量特性
IF 0.8 4区 物理与天体物理
Technical Physics Letters Pub Date : 2026-08-15 DOI: 10.1134/S106378502670063X
L. N. Kashapov, R. N. Kashapov, N. F. Kashapov
{"title":"Specific Energy Characteristics of the Plasma-Electrolyte Process for Producing Hollow SiO2 Particles","authors":"L. N. Kashapov,&nbsp;R. N. Kashapov,&nbsp;N. F. Kashapov","doi":"10.1134/S106378502670063X","DOIUrl":"10.1134/S106378502670063X","url":null,"abstract":"<p>The energy parameters of plasma-electrolyte spraying leading to the formation of hollow SiO<sub>2</sub> particles from an aqueous solution of Na<sub>2</sub>SiO<sub>3</sub> (5 wt % by SiO<sub>2</sub>) in a 300-mL reactor were studied. The discharge was excited at the end of a hollow steel cathode tube by rectangular pulses with a duration of 50 μs and an amplitude of up to 300 V. Modes with a frequency of 5 and 20 kHz were compared. Oscillograms <i>U</i>(<i>t</i>) and <i>I</i>(<i>t</i>), the change in the mass of the solution, and the heating and thermal field of the wall, as well as the yield and morphology of the solid product, were recorded. At 5 kHz, the average power obtained was 75 ± 5 W and the yield was 5.5 ± 0.2 g SiO<sub>2</sub> in 10 min; at 20 kHz, 270 ± 10 W and 11.4 ± 0.3 g in 10 min. The specific energy of synthesis was 8.1 ± 0.6 and 14.2 ± 1.2 kJ/g, respectively. The energy balance showed that, at 5 kHz, the main expenses are due to heating the solution and evaporation of water (a total of ~95%), while at 20 kHz a significant share is taken up by heat removal through the wall and electrode. According to morphological analysis, hollow spherical particles with a diameter of 3–15 µm predominate; an increase in frequency decreases the median diameter and increases the proportion of hollow particles. The obtained relationships between the supplied energy, phase transitions, and product yield were used to formulate ways for optimizing the pulse mode.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 6","pages":"271 - 274"},"PeriodicalIF":0.8,"publicationDate":"2026-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751917","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
A Plasma-Electrolyte Method of Obtaining Thin-Walled Hollow Particles of Silicon Oxide 等离子体-电解质法制备氧化硅薄壁空心颗粒
IF 0.8 4区 物理与天体物理
Technical Physics Letters Pub Date : 2026-08-15 DOI: 10.1134/S1063785026700653
L. N. Kashapov, R. N. Kashapov, N. F. Kashapov
{"title":"A Plasma-Electrolyte Method of Obtaining Thin-Walled Hollow Particles of Silicon Oxide","authors":"L. N. Kashapov,&nbsp;R. N. Kashapov,&nbsp;N. F. Kashapov","doi":"10.1134/S1063785026700653","DOIUrl":"10.1134/S1063785026700653","url":null,"abstract":"<p>A single-stage plasma-electrolyte method for the synthesis of hollow particles of silicon dioxide (SiO<sub>2</sub>) from an aqueous solution of liquid glass without the use of solid templates. A contact glow discharge in the electrolyte was maintained by a dc source with smooth regulation of the output voltage in the range of 0–400 V and a current of 0–10 A in an alkaline solution of Na<sub>2</sub>SiO<sub>3</sub> (≈5 g/L SiO<sub>2</sub>, pH ≈ 12). The morphology of the obtained particles was studied using scanning electron microscopy (SEM). It was found that the main product is hollow spherical particles with a diameter of 0.5–2 µm (<i>D</i><sub>50</sub> ≈ 1.1 µm). Based on SEM images of the destroyed spheres, the shell thickness was estimated to be about 50–120 nm, which corresponds to a relative thickness of <i>t</i>/<i>D</i> ≈ 0.05–0.10. The mechanism of formation of hollow spheres and possible areas of application of the obtained microspheres as lightweight fillers and platforms for subsequent functionalization are discussed.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 6","pages":"298 - 301"},"PeriodicalIF":0.8,"publicationDate":"2026-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751922","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
Metrological Support for Detecting Holes in Bushings for Camshaft Joints 凸轮轴接头衬套孔检测用计量支架
IF 0.8 4区 物理与天体物理
Technical Physics Letters Pub Date : 2026-08-15 DOI: 10.1134/S1063785026700550
O. A. Leonov, V. K. Zimogorsky
{"title":"Metrological Support for Detecting Holes in Bushings for Camshaft Joints","authors":"O. A. Leonov,&nbsp;V. K. Zimogorsky","doi":"10.1134/S1063785026700550","DOIUrl":"10.1134/S1063785026700550","url":null,"abstract":"<p>The study examined the influence of bore gauge measurement errors on the formation of the number of incorrectly accepted and incorrectly rejected bushing holes under the camshaft journals cylinder blocks of YaMZ engines. The rationality of using the most accurate bore gauge from a range of universal instruments that satisfy the basic conditions for selecting measuring instruments has been scientifically substantiated and practically proven; otherwise, even if the selection condition is met, the percentage of losses increases in the form of sending such expensive parts as cylinder blocks to scrap.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 5","pages":"235 - 238"},"PeriodicalIF":0.8,"publicationDate":"2026-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752085","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
A Method of Vibrational Diagnostics of Hydraulic Equipment of Technological Machines Using the Example of a Gear Pump 一种工艺机械液压设备振动诊断方法——以齿轮泵为例
IF 0.8 4区 物理与天体物理
Technical Physics Letters Pub Date : 2026-06-28 DOI: 10.1134/S1063785026700513
O. A. Stupin, A. V. Shitikova, A. S. Apatenko
{"title":"A Method of Vibrational Diagnostics of Hydraulic Equipment of Technological Machines Using the Example of a Gear Pump","authors":"O. A. Stupin,&nbsp;A. V. Shitikova,&nbsp;A. S. Apatenko","doi":"10.1134/S1063785026700513","DOIUrl":"10.1134/S1063785026700513","url":null,"abstract":"<p>Results of research in the field of improving diagnostic methods for the technical condition of the component base of technological machines, in particular, hydraulic drives, are presented. It is proposed to assess the condition of the elements of hydraulic systems of technological machines on the basis of vibroacoustic analysis. Using the example of a gear pump, informative signs in the vibration signal for various types of malfunctions, including wear of bearings and gears, are highlighted. The effectiveness of spectral analysis in terms of power spectral density for defect identification has been proven, which has shown consistent patterns under various operating modes. The method includes a modification with the inclusion of a developed software package for automated signal processing and control decision-making in the diagnostic apparatus. The technique allows a transition to be made from a traditional scheduled maintenance system to maintenance based on condition, adjusting the resource of the hydraulic drive of technological machines for various purposes in real time.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 4","pages":"189 - 196"},"PeriodicalIF":0.8,"publicationDate":"2026-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323621","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
Research of Radial Non-Uniformity of HBr/Cl2 Plasma in Planar ICP Reactor 平面ICP反应器中HBr/Cl2等离子体径向非均匀性研究
IF 0.8 4区 物理与天体物理
Technical Physics Letters Pub Date : 2026-06-28 DOI: 10.1134/S1063785026700367
E. E. Koryakova, A. M. Efremov, R. M. Giniyatullin
{"title":"Research of Radial Non-Uniformity of HBr/Cl2 Plasma in Planar ICP Reactor","authors":"E. E. Koryakova,&nbsp;A. M. Efremov,&nbsp;R. M. Giniyatullin","doi":"10.1134/S1063785026700367","DOIUrl":"10.1134/S1063785026700367","url":null,"abstract":"<p>A comprehensive study of the radial inhomogeneity of the plasma of a mixture of 75% HBr + 25% Cl<sub>2</sub> under conditions of induction RF (13.56 MHz) discharge in the pressure range of 0.8–2.8 Pa and power of 800–1600 W has been carried out. The profiles of radial distribution of concentrations of charged and neutral active particles have been established by methods of probe diagnostics and modeling. It is shown that (a) the best isotropy of the plasma in terms of electron concentration and ion flux is achieved at the upper boundary of the pressure range studied; and (b) the unequal concentration profiles of chlorine and bromine atoms cause a significant (especially at low pressures) change in the [Cl]/[Br] ratio from the center to the periphery.</p>","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 3","pages":"118 - 121"},"PeriodicalIF":0.8,"publicationDate":"2026-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323670","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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