Technical Physics最新文献_第2页

Nature of the Emissivity Behavior of Tellurium and Antimony upon Melting 碲和锑熔化时发射率行为的性质

IF 0.4 4区物理与天体物理

Technical Physics Pub Date : 2026-08-15 DOI: 10.1134/S1063784226700490

D. V. Kosenkov, V. V. Sagadeev

引用次数: 0

Calculating Electric Flux of Non-Uniform Electric Fields for Corona Discharge of Freon Gas 氟利昂气体电晕放电非均匀电场的电通量计算

IF 0.4 4区物理与天体物理

Technical Physics Pub Date : 2026-08-15 DOI: 10.1134/S1063784225601619

Hassan J. Mohammed, Ali Sachit Kaittan, Mayyadah S. Ibrahim

{"title":"Calculating Electric Flux of Non-Uniform Electric Fields for Corona Discharge of Freon Gas","authors":"Hassan J. Mohammed, Ali Sachit Kaittan, Mayyadah S. Ibrahim","doi":"10.1134/S1063784225601619","DOIUrl":"10.1134/S1063784225601619","url":null,"abstract":"This paper examines the self-breakdown of voltage effort in short gaps and mm of flat-out electrical electric poles filled with Freon gas at pressures ranging from 0.5–3 bar. The characterization of electrical breakdown in compressed Freon gas can be studied theoretically. Freon gas can be used as an electrical insulator alone or mixed with Sulphur hexafluoride gas, in order to reduce the cost and obtain a strong insulator at a lower cost, as Freon gas is less insulating compared to Sulphur hexafluoride gas. A proposed formulation of results is presented to make use of gas in the design, insulation, electrical appliances and equipment. Theoretical conclusions on the calculations of the breakdown voltage and the electric field of irregular fields were clarified in the research using non uniform electrodes (needle to plane) for different distances (in mm) and comparing this with Sulphur hexafluoride and air. The theoretical calculations obtained were compared with the practical results and there was a clear match indicated. Freon (R-12) is one of the famous known types of Freon and its name in the International Union of Research and Applied Chemistry is dichlorodifluoromethane. Its chemical shape is (CCL2F2). Freon has been used in many applications in homes, and including in the industrial field, Freon gas voltage is higher in varying electric fields in gaps of a few mm and above due to negative activation compared to positive energy. Negative stimulation reduces the field near the acute cathode, leading to a high breakdown voltage.","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 8","pages":"652 - 660"},"PeriodicalIF":0.4,"publicationDate":"2026-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752107","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

Polymer Composite for Sprayers of Farm Syringes: Tests 农场注射器喷雾器用聚合物复合材料：试验

IF 0.4 4区物理与天体物理

Technical Physics Pub Date : 2026-08-15 DOI: 10.1134/S1063784226700507

V. A. Slavkina, Yu. V. Kataev, A. S. Sviridov, E. F. Malykha, N. V. Sergeeva

{"title":"Polymer Composite for Sprayers of Farm Syringes: Tests","authors":"V. A. Slavkina, Yu. V. Kataev, A. S. Sviridov, E. F. Malykha, N. V. Sergeeva","doi":"10.1134/S1063784226700507","DOIUrl":"10.1134/S1063784226700507","url":null,"abstract":"The service life of an agricultural syringe depends on the sprayer material. To increase the wear resistance of polymer nozzles, disperse fillers are implanted into the composite. The composite for sprayers of agricultural syringes must possess a high chemical resistance to agrochemicals and mechanical strength, as well as low hydro-abrasive wear. To choose an optimal polymer composite for sprayers of agricultural syringes, three composites have been prepared based on polyoxymethylene of grade MASCON POM 27, in which glass fiber, graphite, and silicon carbide have been used with volumetric degrees of filling of 10, 15, and 20%, respectively. Polymer composites have been tested for 14 weeks for chemical resistance to agrochemicals (herbicide “Lazurite,” fungicide “Rakurs,” and insecticide “Boreas Neo”), mechanical strength, and hydro-abrasive wear. Samples of polyoxymethylene of grade MASCON POM 27 have been used as the standard. The results of tensile mechanical strength tests have revealed the largest increase in the strength factor at 15% content of the filler irrespective of its type. The strength of the composite with silicon carbide, glass fiber graphite has increased by 30.2, 26.8, and 27.4%, respectively. It has been established that the chemical resistance of composites is independent of the concentration of agrochemical solution. Experiments on hydro-abrasive wear have revealed that graphite and silicon carbide are effective as fillers and can reduce wear by up to 7.5 times. For manufacturing sprayers for farm syringes, it is recommended to use polyoxymethylene with a silicon carbide content of 15%.","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 8","pages":"644 - 651"},"PeriodicalIF":0.4,"publicationDate":"2026-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752106","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

Terahertz Generation and Nonlinear Propagation of Laguerre–Gaussian Laser Beams in Plasma Channel with Relativistic-Ponderomotive Effects 拉盖尔-高斯激光束在等离子体通道中的太赫兹产生和非线性传播

IF 0.4 4区物理与天体物理

Technical Physics Pub Date : 2026-08-15 DOI: 10.1134/S1063784226600566

Gourab Samantaray, Hansa Upreti, Keshav Walia, Arvinder Singh

{"title":"Terahertz Generation and Nonlinear Propagation of Laguerre–Gaussian Laser Beams in Plasma Channel with Relativistic-Ponderomotive Effects","authors":"Gourab Samantaray, Hansa Upreti, Keshav Walia, Arvinder Singh","doi":"10.1134/S1063784226600566","DOIUrl":"10.1134/S1063784226600566","url":null,"abstract":"In this article, we carry out a theoretical investigation of the self-focusing and propagation characteristics and terahertz (THz) radiation generation of Laguerre–Gaussian (LG) laser beams in an inhomogeneous plasma channel, considering the effects of relativistic and ponderomotive nonlinearities. The analysis is carried out by the method of moments to derive the equation for the evolution of the width of LG laser beams propagating in a preformed parabolic plasma channel. From the results, it is observed that the overall effect of relativistic mass variation and intensity-dependent ponderomotive force results in a significant modification in the plasma refractive index, which in turn affects self-focusing and confinement. The self-focusing is observed to be sensitive to various parameters such as intensity, plasma density, channel depth, and order of LG modes. It is also noted that the most efficient generation of THz radiation occurs in the regime where self-focusing is strongest, which suggests an intrinsic connection between beam confinement effects and plasma low-frequency responses. It is also noted that the THz signal increases with increasing laser intensity and channel depth, which suggests that relativistic ponderomotive effects are key to understanding the overall efficiency of the process. It is also noted that the presence of a preformed parabolic plasma channel enhances the guiding effects, which supports the interaction process. On the whole, the study suggests that structured LG beam modes, especially of higher orders, can be a promising way of controlling self-focusing and boosting THz generation in plasmas, and this may have implications for the creation of a new generation of radiation sources.","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 8","pages":"634 - 643"},"PeriodicalIF":0.4,"publicationDate":"2026-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752105","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

Logical, Mathematical, and Observational Foundations of Flight Theory and Metrology 飞行理论和计量学的逻辑、数学和观测基础

IF 0.4 4区物理与天体物理

Technical Physics Pub Date : 2026-07-08 DOI: 10.1134/S1063784226700465

Yu. D. Chashechkin

{"title":"Logical, Mathematical, and Observational Foundations of Flight Theory and Metrology","authors":"Yu. D. Chashechkin","doi":"10.1134/S1063784226700465","DOIUrl":"10.1134/S1063784226700465","url":null,"abstract":"For describing the energy, dynamics, and structure of heterogeneous media with a nonuniform distributions of pressure, temperature, and concentrations of substances, the system of fundamental equations (SFE) has been chosen and closed with the equations of state for the Gibbs potential and the velocity of sound. The continuous rearrangement of the fine structure of the spatial distribution of thermodynamic potentials, which reflexes the variability of the supramolecular pattern of associates, is accompanied with the conversion of total energy components that affect the general dynamics and structure of flows. The classification of flow components is based on complete solutions of the linearized and weakly nonlinear form of the system of fundamental equations, which are constructed using consistent methods of the theory of regular and singular perturbations. Numerical solutions to problems on a flow past a plate are found using the open source code software. The results of experimental investigations of the dynamics and geometry of slow diffusion-induced creeping flows, nonstationary internal waves, vortices, and wakes, which have been performed at the setups of the Institute for Problems in Mechanics, Russian Academy of Sciences, are in conformity with calculations. The requirement to metrological characteristics of measuring instruments and techniques for application of high-resolution optical systems are considered, which allows to investigate the dynamics and evolution of the fine spatial structure of heterogeneous fluid flows.","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 7","pages":"567 - 580"},"PeriodicalIF":0.4,"publicationDate":"2026-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148433728","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

Evolution of Drop Flows in Gravity and Electrostatic Fields 重力和静电场下滴流的演化

IF 0.4 4区物理与天体物理

Technical Physics Pub Date : 2026-07-08 DOI: 10.1134/S1063784226700489

Yu. D. Chashechkin

引用次数: 0

Coalescence Patterns of Homogeneous Drops of Solutions and Suspensions of Chemically Neutral and Reacting Media 化学中性和反应介质中溶液和悬浮液均相液滴的聚结模式

IF 0.4 4区物理与天体物理

Technical Physics Pub Date : 2026-07-08 DOI: 10.1134/S1063784226700477

Yu. D. Chashechkin

{"title":"Coalescence Patterns of Homogeneous Drops of Solutions and Suspensions of Chemically Neutral and Reacting Media","authors":"Yu. D. Chashechkin","doi":"10.1134/S1063784226700477","DOIUrl":"10.1134/S1063784226700477","url":null,"abstract":"The evolution of the fine structure of the momentum, matter, and energy transfer pattern for а freely falling drop of pure liquid, a homogeneous solution, and suspensions of nanoparticles upon its coalescence with a stationary target liquid has been traced. A system of fundamental equations of heterogeneous fluid mechanics, including the equations of state for the Gibbs potential and density, is selected as the scientific basis of experimental methodology. High-speed video recording with multipoint illumination has made it possible to identify several flow regimes, the structure of which is determined by the ratio of the total energy components of the drop. At a low contact velocity, when the kinetic energy of the drop is lower than the potential surface energy (PSE), in the intrusive mode, the drop smoothly flows into the depth of the liquid and transforms into a vortex ring. In the intermediate mode, the drop hangs on the surface and partially coalesces, ejecting the remainder into the air. In the impact mode, the drop loses its continuity and disintegrates into separate trickles flowing along the contact surface and piercing the bottom of the cavity. The trickles leave behind colored filaments that form linear and reticular structures. The coalescence of chemically reacting liquids and nanoparticle suspensions is also considered.","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 7","pages":"533 - 548"},"PeriodicalIF":0.4,"publicationDate":"2026-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148433751","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 Investigation of CNT/NiO Composite Front Layers Deposited by Pulsed Laser Deposition for Enhanced Solar-Cell Performance: A Literature-Guided Single-Diode MATLAB Study 脉冲激光沉积CNT/NiO复合材料前层提高太阳能电池性能的数值研究：文献导向的单二极管MATLAB研究

IF 0.4 4区物理与天体物理

Technical Physics Pub Date : 2026-07-08 DOI: 10.1134/S1063784226600463

Ghasaq A. Tomaa, Haneen Abass Alrubaie, Nawrs Dhafer Hamzah

{"title":"Numerical Investigation of CNT/NiO Composite Front Layers Deposited by Pulsed Laser Deposition for Enhanced Solar-Cell Performance: A Literature-Guided Single-Diode MATLAB Study","authors":"Ghasaq A. Tomaa, Haneen Abass Alrubaie, Nawrs Dhafer Hamzah","doi":"10.1134/S1063784226600463","DOIUrl":"10.1134/S1063784226600463","url":null,"abstract":"Nickel oxide (NiO) is an attractive p-type wide-band-gap semiconductor for transparent hole-selective interfaces in photovoltaic devices, while carbon nanotubes (CNTs) can provide highly conductive and partially transparent percolation pathways. In this study, the influence of a CNT/NiO composite front layer deposited by pulsed laser deposition (PLD) is investigated numerically through a MATLAB implementation of the single-diode equivalent-circuit model. CNT incorporation is represented through literature-guided reductions in series resistance, moderate increases in photocurrent, and improved shunt resistance relative to a reference NiO layer, enabling a design-oriented interpretation of how conductive CNT networks can strengthen current collection without abandoning the transparency advantages of NiO. The simulated I–V and P–V characteristics predict systematic improvements in short-circuit current density, fill factor, and power-conversion efficiency as CNT loading increases from 0 to 3 wt %. For the assumed parameter set, the efficiency rises from 5.07% for pure NiO to 9.25% for the optimized CNT/NiO configuration. A comparison with prior CNT/NiO coating studies and transparent-conductive CNT literature is used to position the numerical predictions within an experimental context. Overall, the results provide quantitative guidance for selecting CNT loading windows, controlling resistive losses, and prioritizing PLD conditions for future experimental optimization of NiO-based solar-cell front layers.","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 7","pages":"581 - 587"},"PeriodicalIF":0.4,"publicationDate":"2026-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148433748","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

Rheology of Dilute Aqueous Suspensions of Cellulose Nanocrystals and Morphology of Their Films 纤维素纳米晶体稀水悬浮液的流变学及其膜的形态

IF 0.4 4区物理与天体物理

Technical Physics Pub Date : 2026-07-08 DOI: 10.1134/S1063784226700453

O. V. Surov, N. E. Kochkina, M. I. Voronova

{"title":"Rheology of Dilute Aqueous Suspensions of Cellulose Nanocrystals and Morphology of Their Films","authors":"O. V. Surov, N. E. Kochkina, M. I. Voronova","doi":"10.1134/S1063784226700453","DOIUrl":"10.1134/S1063784226700453","url":null,"abstract":"The formation of liquid crystalline (LC) phases in aqueous suspensions of cellulose nanocrystals (CNCs) largely depends on the geometric dimensions of the CNC particles, their concentration, polydispersity, and surface charge. Obtaining reproducible LC structures requires meticulous control over the particle production conditions that determine these properties. The objective of this work is to investigate the possibility of formation of LC phases in dilute aqueous suspensions of CNCs and the preservation of nematic and chiral nematic order in dried films. CNCs were prepared via sulfuric acid hydrolysis of filter paper. Their properties were characterized using transmission electron microscopy, polarized optical microscopy, FTIR spectroscopy, dynamic light scattering, X-ray diffraction and elemental analysis. The rheological properties of dilute CNC suspensions and the morphology of films formed from these suspensions were examined. Additionally, the effect of ultrasonic treatment on the properties of CNC suspensions was evaluated. It was found that LC phase formation begins at a CNC suspension concentration of approximately 1 wt %. Furthermore, the preservation of the oriented distribution of CNC particles in films during their formation was successfully demonstrated.","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 7","pages":"549 - 557"},"PeriodicalIF":0.4,"publicationDate":"2026-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148433851","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

Topological Phase Transition and Majorana Bound States in a One-Dimensional Rashba–Zeeman Superconducting System 一维Rashba-Zeeman超导系统的拓扑相变和Majorana束缚态

IF 0.4 4区物理与天体物理

Technical Physics Pub Date : 2026-07-08 DOI: 10.1134/S1063784226600360

Ismael Elias Erazo Velasco

引用次数: 0