Technical Physics最新文献_第5页

Simulation of the Temperature Field in the Quartz Substrate and the Effect of Thickness on the Laser Damage Mechanism 石英衬底温度场模拟及厚度对激光损伤机理的影响

IF 0.4 4区物理与天体物理

Technical Physics Pub Date : 2026-06-29 DOI: 10.1134/S1063784226600062

Guixia Wang, Yifan Liu

{"title":"Simulation of the Temperature Field in the Quartz Substrate and the Effect of Thickness on the Laser Damage Mechanism","authors":"Guixia Wang, Yifan Liu","doi":"10.1134/S1063784226600062","DOIUrl":"10.1134/S1063784226600062","url":null,"abstract":"The laser-induced damage threshold (LIDT) of optical components is a key parameter for evaluating their resistance to laser damage. Fused quartz is one of the most widely used optical materials. This study investigates the LIDT of quartz substrates with different thicknesses through both theoretical simulations and experimental measurements, aiming to reveal the underlying damage mechanisms. Numerical simulations were conducted to analyze the temperature field distribution of quartz substrates with thicknesses ranging from 1 to 4 mm under 1064 nm nanosecond laser irradiation. Generally, under identical conditions, a higher temperature rise corresponds to a lower LIDT. The simulation results show that as the substrate thickness increases, the LIDT decreases first, then increases, and finally decreases again. Laser-induced damage threshold experiments were subsequently performed, showing that the 1 mm thick quartz substrate exhibited the highest LIDT (30.02 J/cm2), which dropped to its minimum value (4.54 J/cm2) at 2.5 mm and then increased to 17.97 J/cm2 with further thickness growth. The experimental results show a certain degree of consistency with the numerical simulations in terms of the overall variation trend, although discrepancies remain in specific thickness ranges. These findings provide theoretical and practical insights into the thickness optimization and damage-resistance design of optical components.","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 6","pages":"488 - 496"},"PeriodicalIF":0.4,"publicationDate":"2026-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148336862","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

Calculation and Visualization of the Fine Structure of Periodic Flows in Heterogeneous Compressible Media 非均质可压缩介质中周期流精细结构的计算与可视化

IF 0.4 4区物理与天体物理

Technical Physics Pub Date : 2026-06-29 DOI: 10.1134/S1063784226700416

Yu. D. Chashechkin

{"title":"Calculation and Visualization of the Fine Structure of Periodic Flows in Heterogeneous Compressible Media","authors":"Yu. D. Chashechkin","doi":"10.1134/S1063784226700416","DOIUrl":"10.1134/S1063784226700416","url":null,"abstract":"A new universal classification of components of heterogeneous media (liquids, gases, and plasma) flows includes traditional waves and families of ligaments describing the fine structure of distributions of observable physical quantities. The mathematical basis of the classification includes the sets of complete solutions to the system of fundamental equations of fluid mechanics constructed taking into account macro- and microscopic mechanisms of transfer and conversion of energy components. A fluid medium is characterized by equations of state for the Gibbs potential and its derivatives. When solving problems using the algebra of complex numbers, the frequency, which is a measure of energy, preserves its real-valuedness and positive definiteness, and the wave number is chosen to be complex-valued. Complete solutions to linearized and weakly nonlinear equations are found using united perturbation theory. The spatiotemporal parameters of the solutions describing waves and ligaments determine the requirements to experimental techniques as regards the choice of observable physical quantities that permit the assessment of error, the size of the observation area, the sensitivity, as well as the spatial and temporal resolution of instruments. The paper presents complete dispersion relations of propagating periodic surface and internal gravity waves in stratified media. Schlieren methods for visualizations of periodic internal wave beams and ligaments in the depth of a continuously stratified fluid are also considered.","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 6","pages":"449 - 453"},"PeriodicalIF":0.4,"publicationDate":"2026-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148336812","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 External Chamfer on the Performance of a Hartmann Whistle with a Helmholtz Resonator 外倒角对带有亥姆霍兹谐振腔的哈特曼哨子性能的影响

IF 0.4 4区物理与天体物理

Technical Physics Pub Date : 2026-06-29 DOI: 10.1134/S1063784226600268

Yong Son Jong, Chol Jin Jon, Jong Ryol Kim

引用次数: 0

Physical and Mechanical Study of the Behavior of Hybrid Structures 混杂结构性能的物理力学研究

IF 0.4 4区物理与天体物理

Technical Physics Pub Date : 2026-06-29 DOI: 10.1134/S1063784226700441

A. I. Resinets, M. I. Tilinin

{"title":"Physical and Mechanical Study of the Behavior of Hybrid Structures","authors":"A. I. Resinets, M. I. Tilinin","doi":"10.1134/S1063784226700441","DOIUrl":"10.1134/S1063784226700441","url":null,"abstract":"The aim of the study is to comparatively evaluate the strength and mass characteristics of the all-metal and metal–composite versions of the helicopter fuselage design. The main emphasis is laid on the possibility of modernizing existing structures by partially replacing metal elements with polymer composite materials (PCMs). The research methodology includes the development of a standard fuselage design, the construction of finite-element models, and strength calculations. The study is based on a comparison of two configurations: an all-metal structure made of D16 alloy and a hybrid design with selective use of composite materials. For the analysis, the maneuverable calculation cases “pull-up” and “side-slip” are used. The main results show that replacing some of the metal elements with composite materials makes it possible• to maintain the required static safety factor (η ≥ 1.01);• to achieve a 24% reduction in the weight of replaceable components (from 48.2 to 36.7 kg);• to ensure an overall weight saving of the fuselage structure of approximately 12%.The study identifies optimal areas for PCM application: fuselage center skin, tail boom, engine and gearbox cowlings, fairings, and cabin floor panels. The findings of the study confirm the effectiveness of the combined approach to helicopter fuselage design. The obtained results demonstrate that partial replacement of metal elements with composite ones allows for a significant reduction in the weight of the structure while maintaining the required strength characteristics. The developed methodology can be used in the modernization of the existing helicopter fleet and in designing new aircrafts. The practical significance of the work lies in the possibility of using the obtained results to improve helicopter technology in order to enhance its flight performance.","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 6","pages":"497 - 504"},"PeriodicalIF":0.4,"publicationDate":"2026-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148336863","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

Numerical Study of the Helicopter’s Main Rotor Performance when Hovering above the Edge of a Limited Flat Surface 直升机在有限平面边缘盘旋时主旋翼性能的数值研究

IF 0.4 4区物理与天体物理

Technical Physics Pub Date : 2026-06-29 DOI: 10.1134/S106378422670043X

P. V. Makeev, A. I. Shomov, K. A. Erin

{"title":"Numerical Study of the Helicopter’s Main Rotor Performance when Hovering above the Edge of a Limited Flat Surface","authors":"P. V. Makeev, A. I. Shomov, K. A. Erin","doi":"10.1134/S106378422670043X","DOIUrl":"10.1134/S106378422670043X","url":null,"abstract":"On the basis of the original free-wake model the numerical study of the Mi-8 helicopter main rotor hovering above the edge of rectangular flat ground surface of limited dimensions was performed. The original free-wake model developed by authors is used. The study considers the range of distances from the main rotor plane to the surface in the range of 5–16 m. Four values of rotor/surface overlapping have been considered: 100, 75, 50, and 25% of rotor diameter. Hovering near an infinite ground surface was considered additionally. To simulate an infinite surface, the method of mirrored rotor’s wake is used. Limited surface is modeled by a layer of dipoles. Both approaches are validated by comparison with each other and with experimental data (for the case of an infinite surface). The main rotor wake shapes and flow structures have been obtained and analyzed. For constant rotor’s power, the curves of the thrust vs. hovering height have been constructed. Comparison with available experimental and calculated data has been performed. The authors made conclusions about the effect of a limited surface on the increase in rotor thrust with varying levels of rotor/surface overlapping area and hovering height values. In particular, the study showed that the maximum thrust gain (at the lowest possible hovering height) with the full (100%) rotor/surface overlapping is 22%. With a decrease in overlapping ratio to 75, 50, and 25% the thrust gain decreases to 15, 6, and 3%. The obtained results are the newest and can supply the computational and experimental data in this area.","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 6","pages":"505 - 513"},"PeriodicalIF":0.4,"publicationDate":"2026-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148336750","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

Optimized Toggle Flip-Flop for Asynchronous Mod-10 BCD Counter Layout Using QCA 基于QCA的异步Mod-10 BCD计数器布局的优化切换触发器

IF 0.4 4区物理与天体物理

Technical Physics Pub Date : 2026-06-29 DOI: 10.1134/S1063784225601437

Rohit Kumar Shaw, Angshuman Khan, M. C. Parameshwara

{"title":"Optimized Toggle Flip-Flop for Asynchronous Mod-10 BCD Counter Layout Using QCA","authors":"Rohit Kumar Shaw, Angshuman Khan, M. C. Parameshwara","doi":"10.1134/S1063784225601437","DOIUrl":"10.1134/S1063784225601437","url":null,"abstract":"Quantum-dot Cellular Automata (QCA) offers a paradigm shift from CMOS by leveraging quantum confinement and electron tunneling for ultra-low-power nanocomputing. This technology enables the creation of sequential digital circuits without transistors, utilizing cell polarization for both logic and data storage. This paper addresses the lack of reset-enabled flip-flops and dedicated decimal counters in QCA by proposing a novel T flip-flop with integrated asynchronous reset functionality, optimized from a baseline design to achieve highly polarized outputs and high energy efficiency. Based on this design, the first-ever QCA-based asynchronous Binary-Coded Decimal (BCD) counter is introduced, reducing cell count by 30.4% compared to existing 4-bit counters, using 61.8% less energy, and employing multilayer crossovers for full input-output accessibility and zero crosstalk. The design ensures scalability and thermal stability, making it ideal for applications like digital clocks and biomedical devices. This work bridges critical gaps in QCA sequential logic, providing a foundation for future nano-IC fabrication and complex decimal-based systems.","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 6","pages":"357 - 367"},"PeriodicalIF":0.4,"publicationDate":"2026-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148336723","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

Color Panoramic and Narrow-Field Schlieren Observations of Heterogeneous Fluid Flows 非均匀流体流动的彩色全景和窄场纹影观测

IF 0.4 4区物理与天体物理

Technical Physics Pub Date : 2026-06-29 DOI: 10.1134/S1063784226700428

Yu. D. Chashechkin

引用次数: 0

Features of the Formation of a Digital Elevation Model for Simulating the Transport of Suspended Sediments 模拟悬浮沉积物输运的数字高程模型的形成特征

IF 0.4 4区物理与天体物理

Technical Physics Pub Date : 2026-06-29 DOI: 10.1134/S1063784226700362

M. V. Ivanov, A. N. Ugarov, A. A. Ryazantsev, V. D. Vyazova, R. A. Taranov, B. S. Ksenofontov

引用次数: 0

Dynamic Model of a Robotic Train Based on Gauss’s Principle of Least Compulsion 基于高斯最小强迫原理的机器人列车动力学模型