Technical Physics Letters最新文献

Reproducibility of Velocity Profiles in Gas Flow Metering Units under Complex Gasdynamic Conditions 复杂气体动力学条件下气体流量计量装置速度分布的再现性

IF 0.8 4区物理与天体物理

Technical Physics Letters Pub Date : 2026-10-20 DOI: 10.1134/S1063785026700938

N. S. Dushin, I. V. Nikiforov, A. A. Valeev

引用次数: 0

Secondary Flows and Hydraulic Resistance in a Rectangular Channel with Spatially Inhomogeneous Discrete Roughness 具有空间非均匀离散粗糙度的矩形通道中的二次流和水力阻力

IF 0.8 4区物理与天体物理

Technical Physics Letters Pub Date : 2026-10-20 DOI: 10.1134/S1063785026700926

R. R. Shakirov, I. A. Davletshin, N. I. Mikheev

{"title":"Secondary Flows and Hydraulic Resistance in a Rectangular Channel with Spatially Inhomogeneous Discrete Roughness","authors":"R. R. Shakirov, I. A. Davletshin, N. I. Mikheev","doi":"10.1134/S1063785026700926","DOIUrl":"10.1134/S1063785026700926","url":null,"abstract":"Spanwise heterogeneous surface roughness can induce secondary flows of Prandtl’s second kind, which significantly affect momentum and heat transfer. Despite a large number of numerical studies of such flows, experimental data remain rather limited. In this paper, an experimental study of turbulent flow in a rectangular channel with walls formed by alternating smooth sections and strips of discrete roughness is performed. The fields of mean velocities and turbulence characteristics are obtained using the SIV method, and the structure of secondary flows is reconstructed. Measurements of hydraulic resistance are carried out for various surface configurations and Reynolds numbers. It is shown that heterogeneous roughness leads to the formation of large-scale secondary flows in the form of counter-rotating vortices with a transverse velocity of up to 5% of the main flow velocity. A correlation between the intensity of secondary flows and the hydraulic resistance coefficient is revealed, indicating a significant role of secondary circulation in momentum transfer mechanisms in the channel.","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 9","pages":"476 - 483"},"PeriodicalIF":0.8,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149222773","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

Monte Carlo Analysis of Ga2O3 Damage from Alpha Particle Radiation α粒子辐射对Ga2O3损伤的蒙特卡罗分析

IF 0.8 4区物理与天体物理

Technical Physics Letters Pub Date : 2026-10-20 DOI: 10.1134/S1063785026600626

Daotian Shi, Chuanyang Liu, Qing Sun, Jingjing Liu, Xinjiang Wang, Huakui Hu

{"title":"Monte Carlo Analysis of Ga2O3 Damage from Alpha Particle Radiation","authors":"Daotian Shi, Chuanyang Liu, Qing Sun, Jingjing Liu, Xinjiang Wang, Huakui Hu","doi":"10.1134/S1063785026600626","DOIUrl":"10.1134/S1063785026600626","url":null,"abstract":"In this study, we used the Monte Carlo method to simulate the interaction of alpha particles with Ga2O3 and assess radiation damage. The findings show that alpha particles are primarily stopped by electrons, with ionization dominating energy dissipation, while phonon and vacancy‑related losses contribute negligibly. Over the investigated energy range, ionization loss increased with radiation energy, while both phonon and vacancy losses decreased. At a radiation energy of 2.05 MeV, ionization accounts for 99.41% of the total energy loss, while phonon excitation and vacancy formation contribute only 0.03 and 0.52%, respectively. As the radiation energy increased from 2.05 to 5.48 MeV, the peak energy absorbed by Ga and O atoms decreased from 0.81 and 0.84 eV to 0.62 eV, respectively. Alpha particles in Ga2O3 have a spatial distribution similar to a tadpole. The calculated maximum values were 0.0347 for displacement per atom (DPA), 1.63 × 1021 cm–3 for VGa concentration, and 1.65 × 1021 cm–3 for VO concentration. These results demonstrate that alpha particle irradiation causes substantial damage in Ga2O3, posing a critical threat to both material integrity and device functionality.","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 9","pages":"493 - 500"},"PeriodicalIF":0.8,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149222571","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

Theoretical Estimation of the Heat Transfer Coefficient in a Plane Channel 平面通道内传热系数的理论估计

IF 0.8 4区物理与天体物理

Technical Physics Letters Pub Date : 2026-10-20 DOI: 10.1134/S106378502670094X

N. D. Bogdanov, I. A. Davletshin

引用次数: 0

The Formation of Majorana Zero Modes in Chiral Carbon Nanotubes under the Influence of Geometric Factors 几何因素影响下手性碳纳米管中Majorana零模式的形成

IF 0.8 4区物理与天体物理

Technical Physics Letters Pub Date : 2026-10-20 DOI: 10.1134/S1063785026600535

I. Erazo Velasco, D. A. Kuzmin

{"title":"The Formation of Majorana Zero Modes in Chiral Carbon Nanotubes under the Influence of Geometric Factors","authors":"I. Erazo Velasco, D. A. Kuzmin","doi":"10.1134/S1063785026600535","DOIUrl":"10.1134/S1063785026600535","url":null,"abstract":"In this paper, we investigate the occurrence of Majorana zero modes in carbon nanotubes in contact with a conventional superconductor and placed in a longitudinal magnetic field. The influence of nanotube geometry, determined by chirality indices ((n,m)), on the conditions for the formation of the topological superconducting phase is considered. It is shown that chirality changes the electronic structure of the nanotube, the spin–orbit interaction and the effective chemical potential, which determine the conditions of the topological phase transition. To describe the system, an effective model based on the Bogolyubov–de Gennes Hamiltonian is constructed, which allows one to obtain a criterion for the occurrence of Majorana null modes. Based on the developed model, a method for selecting the most favorable geometries of carbon nanotubes is proposed. Numerical results show that certain chiralities minimize the effective chemical potential and facilitate the transition of the system to the topological phase. The obtained results show that the geometry of the carbon nanotube is an effective parameter for controlling the topological properties of the system and can serve as a criterion for choosing the chiralities that are most promising for the experimental implementation of Majorana zero modes.","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 9","pages":"507 - 520"},"PeriodicalIF":0.8,"publicationDate":"2026-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149222771","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 Issue of Calculating Actuator Rod Stability When Regulating the Performance of a Piston Compressor 活塞式压缩机性能调节时作动杆稳定性计算问题研究

IF 0.8 4区物理与天体物理

Technical Physics Letters Pub Date : 2026-10-20 DOI: 10.1134/S1063785026600596

R. E. Kobyl’skiy

引用次数: 0

A Study of the Flow Rate Coefficient When Wet Refrigerant Vapor Leaks through Cracks 湿制冷剂蒸汽通过裂缝泄漏时流量系数的研究

IF 0.8 4区物理与天体物理

Technical Physics Letters Pub Date : 2026-10-20 DOI: 10.1134/S1063785026700914

N. A. Raikovsky, D. Kh. Sadvakasov, V. S. Evdokimov, E. A. Zhukova, M. N. Komarova, I. A. Leshakov

引用次数: 0

On the Need to Take into Account the Redistribution of Pressure Drop during Wear of the Seals of a Low-Speed Piston Stage 考虑低速活塞级密封件磨损时压降再分布的必要性

IF 0.8 4区物理与天体物理

Technical Physics Letters Pub Date : 2026-08-31 DOI: 10.1134/S1063785026600717

R. E. Kobyl’skiy, S. S. Busarov

引用次数: 0

Field Validation and Improvement of a Backlight Compensation Method for Optical 3D Scanning in Industrial Livestock Buildings Using a Physics-Informed Neural Network 基于物理信息神经网络的工业畜舍光学三维扫描背光补偿方法的现场验证与改进

IF 0.8 4区物理与天体物理

Technical Physics Letters Pub Date : 2026-08-31 DOI: 10.1134/S1063785026700902

D. A. Moskvichev

{"title":"Field Validation and Improvement of a Backlight Compensation Method for Optical 3D Scanning in Industrial Livestock Buildings Using a Physics-Informed Neural Network","authors":"D. A. Moskvichev","doi":"10.1134/S1063785026700902","DOIUrl":"10.1134/S1063785026700902","url":null,"abstract":"Previously developed combined methods of stray light compensation for time cameras of time-of-flight systems have demonstrated high efficiency in laboratory conditions, but their operation in real livestock buildings faces additional destabilizing factors: rapid changes in illumination (movement of the Sun, switching on/off LED lamps), dustiness of protective optics, and dynamic shadows from animals and personnel, as well as the movement of objects (animals). This paper presents the results of long-term field trials on a dairy farm (120 heads). A unique dataset (ToF + RGB + reference laser scanner) was collected in 12 different lighting scenarios. Based on this data, a physics-informed neural network (PINN) is a deep-learning neural network that takes raw intensity and phase data (224 × 171 pixels) as input and directly reconstructs depth without iteratively solving the inverse problem. The network uses regularization based on the diffusion approximation and the wet film model. After optimization on a Raspberry Pi 5 single-board computer, the processing time of one frame was 8.2 ms (120 fps), which is ten times faster than the previous algorithmic solution. Moreover, the root-mean-square depth error on moving animals is reduced by 72% compared to pure spectral filtering (from 28.4 to 7.9 mm) and by 41% compared to the best method (9.1 mm → 7.9 mm). The neural network approach also automatically compensates for dust on the camera’s protective glass and slow temperature drifts. The developed system has been put into trial operation as part of a robotized milking installation.","PeriodicalId":784,"journal":{"name":"Technical Physics Letters","volume":"52 8","pages":"435 - 441"},"PeriodicalIF":0.8,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148859762","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

Increasing the Service Life of Piston Machines for Autonomous Operating Facilities 提高自主操作设施活塞机的使用寿命

IF 0.8 4区物理与天体物理

Technical Physics Letters Pub Date : 2026-08-31 DOI: 10.1134/S1063785026600444

R. Kobylsky

引用次数: 0