Technical Physics Letters最新文献_第3页

Study on Current Sheet Distortion in Pulsed Plasma Thrusters 脉冲等离子体推力器电流片畸变的研究

IF 0.8 4区物理与天体物理

Technical Physics Letters Pub Date : 2026-08-15 DOI: 10.1134/S1063785026600481

Guorui Sun

引用次数: 0

Electrolytic-Plasma Processing of the Surface of an Aluminum Part Manufactured by an Additive Method 用加法法制造的铝件表面的电解等离子体处理

IF 0.8 4区物理与天体物理

Technical Physics Letters Pub Date : 2026-08-15 DOI: 10.1134/S1063785026700616

F. M. Gaisin, Az. F. Gaisin, R. R. Kayumov, Al. F. Gaisin

引用次数: 0

Electric-Field Control of Terahertz Radiation Scattering Using Nanostructured Graphene Metasurfaces 利用纳米结构石墨烯超表面对太赫兹辐射散射进行电场控制

IF 0.8 4区物理与天体物理

Technical Physics Letters Pub Date : 2026-08-15 DOI: 10.1134/S1063785026700574

M. S. Nikitin, G. S. Makeeva

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A Study of the Operation of a Self-Acting Valve with Structural Elastomeric Elements of Low-Speed Long-Stroke Compressor Stages 低速长冲程压缩机级结构弹性元件自动阀的工作特性研究

IF 0.8 4区物理与天体物理

Technical Physics Letters Pub Date : 2026-08-15 DOI: 10.1134/S1063785025600863

I. S. Busarov, S. S. Busarov, R. E. Kobyl’skiy, Yu. D. Busarova

{"title":"A Study of the Operation of a Self-Acting Valve with Structural Elastomeric Elements of Low-Speed Long-Stroke Compressor Stages","authors":"I. S. Busarov, S. S. Busarov, R. E. Kobyl’skiy, Yu. D. Busarova","doi":"10.1134/S1063785025600863","DOIUrl":"10.1134/S1063785025600863","url":null,"abstract":"The work under consideration identifies and solves the problem of the operation of self-acting valves for low-speed long-stroke piston compressors (hereinafter referred to as LSLSPC), a feature of which is a significant length of the compression cycle compared to existing machines [1, 2]. Long working cycle times (more than 2 s) result in significant gas leaks. For this reason, ensuring a tight fit between the valve shut-off element and the seat is the main task of modernizing gas distribution systems. This problem was solved by installing an elastomeric element on the valve seat. This not only ensured a smaller gap, but also reduced the perimeter of the valve seat contact. A method is considered for determining the pressure coefficient of a gas flow on the shut-off element of a self-acting valve and the valve flow coefficient. The mathematical model of the working process of a low-speed long-stroke stage of a piston compressor has been improved by introducing a function for changing the pressure coefficient and flow coefficient due to changes in the stroke of the valve shut-off element. A mathematical model was verified, and integral characteristics of the working process of a low-speed long-stroke stage of a piston compressor with self-acting valves containing elastomeric elements were obtained.","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 6","pages":"370 - 377"},"PeriodicalIF":0.8,"publicationDate":"2026-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751849","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

Stages of Formation of Thin-Walled Hollow SiO2 Particles in a Plasma-Electrolyte Discharge 等离子体-电解质放电中薄壁空心SiO2颗粒形成的阶段

IF 0.8 4区物理与天体物理

Technical Physics Letters Pub Date : 2026-08-15 DOI: 10.1134/S1063785026700641

L. N. Kashapov, R. N. Kashapov, N. F. Kashapov

{"title":"Stages of Formation of Thin-Walled Hollow SiO2 Particles in a Plasma-Electrolyte Discharge","authors":"L. N. Kashapov, R. N. Kashapov, N. F. Kashapov","doi":"10.1134/S1063785026700641","DOIUrl":"10.1134/S1063785026700641","url":null,"abstract":"Plasma-electrolyte discharge in aqueous solutions of silicates is accompanied by the release of microdroplets, which undergo heating, dehydration, and structuring in fractions of a millisecond. The paper examines the mechanism for obtaining thin-walled hollow SiO2 particles according to the “bubble in a drop” scheme, when a surface gel crust of silica is formed at the boundary of the drop, and the subsequent vapor–gas expansion of the cavity stretches the shell and reduces its relative thickness. Experiments were carried out using a contact plasma-electrolyte discharge setup at a voltage of 550–750 V in liquid-glass solutions with a mass fraction of SiO2 5–15%. The morphology was analyzed by scanning electron microscopy; the specific surface area and porosity were estimated by nitrogen adsorption; the density was determined pycnometrically. Stable hollow particles with a diameter of 2–5 µm and a shell thickness of 0.10–0.32 µm were obtained. An increase in the discharge energy input led to a decrease in the shell thickness with a comparable range of sizes, which is consistent with the model of shell stretching in a plastic state. It is shown that the concentration of the initial solution determines the mass balance of silica and the upper limit of the wall thickness, while the electrical mode controls the rate of dehydration and the moment of gas expansion.","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 6","pages":"280 - 283"},"PeriodicalIF":0.8,"publicationDate":"2026-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751918","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

Key Processes in the Formation of Hollow SiO2 Particle in Plasma-Electrolytic Spraying 等离子体电解喷涂中SiO2空心颗粒形成的关键过程

IF 0.8 4区物理与天体物理

Technical Physics Letters Pub Date : 2026-08-15 DOI: 10.1134/S1063785026700720

L. N. Kashapov, R. N. Kashapov, N. F. Kashapov, V. Yu. Chebakova

{"title":"Key Processes in the Formation of Hollow SiO2 Particle in Plasma-Electrolytic Spraying","authors":"L. N. Kashapov, R. N. Kashapov, N. F. Kashapov, V. Yu. Chebakova","doi":"10.1134/S1063785026700720","DOIUrl":"10.1134/S1063785026700720","url":null,"abstract":"Plasma-electrolyte spraying of an aqueous solution of liquid glass allows one to obtain hollow microspheres of silicon dioxide (SiO2) without organic templates and core removal steps. The aim of the work is to describe the key thermal and chemical processes in the zone of a pulsed microarc discharge and to determine the parameter window in which stable hollow shells are formed. It is shown that, at pulses of 300–700 V (τ = 200 μs, f = 100 Hz), local heating and the formation of a gas bubble lead to intense evaporation of water and an increase in the concentration of silicate complexes in the surface layer of the microdroplet. At the same time, active particles (OH•, H•, H2O2, etc.) form in the plasma–liquid region [14, 15, 32–35], which may be accompanied by a local decrease in alkalinity and acceleration of the transition of soluble silicates into solid SiO2. A shell is formed at the “steam–solution” boundary, after which water vapor and H2, which arises during plasmolysis of water, expand the internal cavity. In a series of experiments with varying voltage, silicate concentration, and processing time, the maximum proportion of intact hollow spheres was achieved at U = 500 V and C = 100 g/L: according to scanning electron microscopy estimates, 70–85% of the particles have a pronounced cavity, an outer diameter of 4–6 μm and a wall thickness of about 0.08–0.15 μm. A stage model is proposed that relates the transition between solid spheres, destroyed shells, and stable hollow particles with competition of SiO2 deposition rates and gas formation.","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 6","pages":"317 - 321"},"PeriodicalIF":0.8,"publicationDate":"2026-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751937","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

First-Principles Study of the Structural, Electronic, and Optical Properties of Ba1–xSrxTiO3 for Semiconductor and Optoelectronic Applications 半导体与光电用Ba1-xSrxTiO3结构、电子与光学性质的第一性原理研究

IF 0.8 4区物理与天体物理

Technical Physics Letters Pub Date : 2026-08-15 DOI: 10.1134/S1063785026600237

F. Benlakhdar, Idris Bouchama, M. A. Ghebouli, Aseel Smerat, Mustafa Jaipallah Abdelmageed Abualreish, Murat Yaylacı, S. Alomairy, M. Fatmi

{"title":"First-Principles Study of the Structural, Electronic, and Optical Properties of Ba1–xSrxTiO3 for Semiconductor and Optoelectronic Applications","authors":"F. Benlakhdar, Idris Bouchama, M. A. Ghebouli, Aseel Smerat, Mustafa Jaipallah Abdelmageed Abualreish, Murat Yaylacı, S. Alomairy, M. Fatmi","doi":"10.1134/S1063785026600237","DOIUrl":"10.1134/S1063785026600237","url":null,"abstract":"First-principles calculations based on density functional theory (DFT) were performed to investigate the structural, electronic, and optical properties of Sr-substituted BaTiO3 (Ba1–xSrxTiO3) with emphasis on its semiconductor behavior and potential for optoelectronic applications. The calculations were carried out using the plane-wave pseudopotential method within the generalized gradient approximation as implemented in the CASTEP code. The results reveal a systematic lattice contraction with increasing Sr concentration, consistent with Vegard’s law, while preserving the tetragonal structural distortion. Electronic structure analysis shows that Ba1–xSrxTiO3 exhibits an indirect band gap character, with the band gap gradually increasing as a function of Sr content. This band gap modulation highlights the tunability of the material’s semiconductor properties through compositional engineering. Furthermore, the density of states indicates strong hybridization between Ti-3d and O-2p orbitals, confirming the covalent nature of bonding and its influence on the electronic behavior. Optical properties, including absorption coefficient, reflectivity, and refractive index, demonstrate enhanced optical response in the visible and ultraviolet regions with increasing Sr incorporation. These findings establish Ba1–xSrxTiO3 as a tunable semiconductor material with promising performance for optoelectronic applications, such as photovoltaic devices, sensors, and optical components.","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 5","pages":"214 - 220"},"PeriodicalIF":0.8,"publicationDate":"2026-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752081","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

Studying the Effect of Parameters of a High-Frequency Inductive Discharge on the Size of Silicon Dioxide Particles during Processing 研究高频电感放电参数对加工过程中二氧化硅颗粒尺寸的影响

IF 0.8 4区物理与天体物理

Technical Physics Letters Pub Date : 2026-08-15 DOI: 10.1134/S1063785026700628

V. E. Katnov, M. F. Shaekhov, S. A. Trubitsina, O. P. Kuznetsova, R. R. Katnova, T. A. Kholmurodov

引用次数: 0

Operating Processes of Periodic Compressors 周期压缩机运行过程

IF 0.8 4区物理与天体物理

Technical Physics Letters Pub Date : 2026-08-15 DOI: 10.1134/S1063785026600225

S. S. Busarov, D. R. Marchenko, I. S. Busarov

{"title":"Operating Processes of Periodic Compressors","authors":"S. S. Busarov, D. R. Marchenko, I. S. Busarov","doi":"10.1134/S1063785026600225","DOIUrl":"10.1134/S1063785026600225","url":null,"abstract":"For various mobile facilities utilizing general-purpose air-compressor units, simplifying equipment design and maintenance are pressing issues. These units often utilize intermittent compressors. The operating parameters of intermittent compressors and their design principles are poorly described in the available literature. This paper examines the operating modes and develops recommendations for the design of intermittent compressors. It is known that, for compressors with lubricated flow paths, the determining factor limiting the pressure ratio in the piston compressor stage is the oil flash point. Dry-chamber compressors are an alternative to such machines. For such machines, the determining factor for the maximum pressure ratio is the temperature in the friction zone. This approach is the basis for the presented study. It has been shown that the pressure increase in periodic compressors with dry flow chambers can range from 10 to 15. The selection of the maximum pressure increase ratio must take into account external (environmental) parameters, the material design of the compressor cylinders, and efficient operating parameters such as isothermal indicated efficiency and supply rate.","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 5","pages":"221 - 225"},"PeriodicalIF":0.8,"publicationDate":"2026-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752082","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

The Jump in the Emissivity of Metals upon Melting and Its Relationship with Electrical Resistivity and the Entropy of Fusion 金属熔化时发射率的跃变及其与电阻率和熔合熵的关系

IF 0.8 4区物理与天体物理

Technical Physics Letters Pub Date : 2026-08-15 DOI: 10.1134/S1063785026700537

D. V. Kosenkov, V. V. Sagadeev

引用次数: 0