Technical Physics最新文献_第3页

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

Industrial Robot Selection Using a New Multi-Criteria Decision-Making Method with Linguistic Evaluation Data Based on Final Overall Evaluation Grade Indices 基于最终综合评价等级指标的语言评价数据多准则决策的工业机器人选择

IF 0.4 4区物理与天体物理

Technical Physics Pub Date : 2026-07-08 DOI: 10.1134/S1063784226600232

Won-Chol Yang, Chung-Gil Choe, Jin-Sim Kim

{"title":"Industrial Robot Selection Using a New Multi-Criteria Decision-Making Method with Linguistic Evaluation Data Based on Final Overall Evaluation Grade Indices","authors":"Won-Chol Yang, Chung-Gil Choe, Jin-Sim Kim","doi":"10.1134/S1063784226600232","DOIUrl":"10.1134/S1063784226600232","url":null,"abstract":"Robot selection is one of the typical multi-criteria decision making (MCDM) problems. Many MCDM methods with linguistic evaluation terms have been used to solve robot selection problem. This paper proposed a new simple and straightforward MCDM method with linguistic evaluation data given by multiple decision-makers (DMs) based on final overall evaluation grade index. It consists of two major steps: (1) determining overall evaluation grade indices (OGIs) and overall evaluation grades (OGs) of the alternatives by each DM based on importance-weighted grade-membership degree, and (2) determining final OGIs, final OGs, and final ranks of the alternatives based on preference-weighted mean operation by integrating the OGIs from each DM. To illustrate its effectiveness, it was applied to evaluate and rank eight alternative industrial robots in consideration of 7 criteria. The final ranking determined using the proposed method was compared with the rankings determined using some previous works. The results demonstrated that the final ranking using the proposed method were pretty coincided with the rankings from the other previous works, and the proposed method had the highest mean correlation coefficient and lowest mean rank deviation from among the compared MCDM methods. It is not only simple, easy to understand and implement but also accurate and reasonable in the result. It could be easily and widely applied to many group linguistic MCDM problems with linguistic evaluation terms arising in the advanced industrial manufacturing technologies.","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 7","pages":"524 - 532"},"PeriodicalIF":0.4,"publicationDate":"2026-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148433750","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 CFD Analysis of Soy Wax Encapsulated Concrete Sandwich Panel for Thermal Energy Storage 大豆蜡包覆储热混凝土夹芯板的数值CFD分析

IF 0.4 4区物理与天体物理

Technical Physics Pub Date : 2026-07-08 DOI: 10.1134/S1063784226600451

Amisha Singh, Anjali Agrawal, Mohd. Sharique Ahmad

{"title":"Numerical CFD Analysis of Soy Wax Encapsulated Concrete Sandwich Panel for Thermal Energy Storage","authors":"Amisha Singh, Anjali Agrawal, Mohd. Sharique Ahmad","doi":"10.1134/S1063784226600451","DOIUrl":"10.1134/S1063784226600451","url":null,"abstract":"This study investigates the thermal performance of soy wax phase change material (PCM) integral within M30-grade concrete sandwich blocks for passive cooling of building housings in hot-dry climates. A representative 500 × 500 × 100 mm specimen incorporating 40 mm concrete outer layers sandwiching a 20 mm soy wax core was overcome to 880 J total heat input (equivalent to q = 2.44 W/m2 over 0.25 m2 × 36 000 s) on the top surface. Transient 3D heat transfer was simulated in ANSYS Fluent v2025 R1 using the enthalpy-porosity method (Amush = 105 kg/(m3 s)), incorporating M30 concrete properties per IS 10262:2009 (ρ = 2300 kg/m3, k = 1.37 W/(m K), Cp = 880 J/(kg K)) and soy wax attributions (ΔH = 182 kJ/kg, Tm = 45–50°C, k = 0.22 W/(m K), ρsolid/liquid = 920/860 kg/m3). Outcomes demonstrate the PCM core absorbed 598 J (68%) as latent heat, achieving 38% peak bottom-surface temperature reduction (68°C → 42°C vs. plain concrete baseline), 55% heat flux damping (decrement factor DF = 0.45), and 25-min thermal time lag. Complete PCM melting (β = 0.992) nurtured near-isothermal buffering at 45–50°C for ~600 min, with global energy balance closure <0.5% (Elatent + Esensible + Etransmitted = 880 J).These decisions validate soy wax-M30 concrete sandwiches as a cost-effective (₹150–250/kg PCM), recyclable solution providing 6.9× greater energy density than concrete sensible storage, ideal for scalable diurnal solar heat administration in Indian building envelopes.","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 7","pages":"558 - 566"},"PeriodicalIF":0.4,"publicationDate":"2026-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148433747","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