Technical Physics最新文献

{"title":"Entropy Dependences of Thermal Radiation from Iron‒Chromium Alloys","authors":"D. V. Kosenkov,&nbsp;V. V. Sagadeev","doi":"10.1134/S1063784226700040","DOIUrl":"10.1134/S1063784226700040","url":null,"abstract":"<p>Our goal was to check the potential of the entropic approach in describing the behavior of thermal radiation from Fe‒Cr alloys. Based on experimental data on resistivity, the normal integral emissivity has been estimated according to the Foot approximation and the radiation flux density has been calculated. Results have been analyzed in terms of an approach in which the normalized thermal flux is compared with dimensionless entropy characterizing the thermodynamic state of the system. The efficiency of such an approach in elucidating the specific features of thermal radiation from alloys with a complex phase diagram has been demonstrated. From relationships found, one can predict the emission properties of Fe‒Cr alloys.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 2","pages":"76 - 82"},"PeriodicalIF":0.7,"publicationDate":"2026-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147631780","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}

{"title":"Analytical ETBDW Formulation for Electromagnetic Scattering by Circular Apertures on PMC Surfaces","authors":"M. Altınel,&nbsp;U. Yalçın","doi":"10.1134/S1063784225601206","DOIUrl":"10.1134/S1063784225601206","url":null,"abstract":"<p>This study presents and validates a uniform analytical formulation for electromagnetic diffraction from circular apertures on perfect magnetic conductor (PMC) surfaces using the extended boundary diffraction wave (ETBDW) theory. The proposed PMC–ETBDW model incorporates an in-phase reflection coefficient (<span>({{{{Gamma }}}_{E}})</span> = +1) within the boundary kernel, producing a physically continuous and energy-conserving representation of diffracted fields across illuminated, transition, and shadow regions. Expressed through detour parameters and Fresnel-type transition functions, the formulation eliminates phase discontinuities and maintains amplitude normalization consistent with theoretical energy conservation. Numerical evaluations performed for representative aperture radii (<i>a</i> = λ–3λ) and observation distances (<i>r</i> = 3λ–9λ) confirmed the expected 1/<i>r</i> amplitude decay, smooth Fresnel–Fraunhofer transitions, and constructive interference associated with magnetic reflection. Comparative analyses with PEC and opaque boundaries verified that in-phase magnetic reflection enhances on-axis field intensity and preserves phase continuity near the shadow boundary, in full agreement with the dual electromagnetic behavior predicted for PMC interfaces. Beyond its theoretical completeness, the proposed formulation provides a compact and computationally efficient framework for diffraction modeling and hybrid solver integration, offering practical applicability to magnetic coatings, low-RCS reflectors, and metasurface-based structures.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 2","pages":"47 - 59"},"PeriodicalIF":0.7,"publicationDate":"2026-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147631777","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}

{"title":"Photonic Interface between the Polarization and Phase Encodings of Photonic Qubits","authors":"L. R. Gilyazov,&nbsp;S. A. Moiseev,&nbsp;V. L. Kurochkin","doi":"10.1134/S1063784225600882","DOIUrl":"10.1134/S1063784225600882","url":null,"abstract":"<p>A photonic interface is suggested that provides the deterministic transformation of photonic qubits with polarization encoding to photonic qubits with phase encoding of two-frequency radiation. The suggested interface configuration employs the means of coherent optics and may be applied in creating hybrid quantum networks.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 2","pages":"64 - 70"},"PeriodicalIF":0.7,"publicationDate":"2026-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147631781","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}

{"title":"A New Approach to Evaluate Final Comprehensive Performance of Phase Change Materials by Multiple Multi Criteria Decision Making Methods","authors":"Chol-Ryong Pak,&nbsp;Won-Chol Yang,&nbsp;Chol-Min Jong","doi":"10.1134/S1063784226600116","DOIUrl":"10.1134/S1063784226600116","url":null,"abstract":"<p>For latent heat thermal energy storage systems, the comprehensive performance evaluation of phase change materials (PCMs) is very important task in the selection of the most suitable PCM from among multiple alternative PCMs. It is one of the typical multi criteria decision making (MCDM) problems. Some previous works applied various MCDM methods to the given PCM selection problem based on the experience and usage easiness. The results obtained from different MCDMs may differ with one another, and it is unknown which is the best suitable MCDM. This work proposed a new hybrid MCDM approach to evaluate final comprehensive performance of the PCMs. It is based on final comprehensive performance index (CPI), which is the priority weighted mean of the CPIs obtained from multiple MCDMs. This work applied the proposed approach to evaluate the comprehensive performance of 9 alternative PCMs for solar domestic hot water system using 6 MCDMs. As the result, the comprehensive performance ranking of the PCMs was <i>n</i>-eicosane &gt; <i>n</i>-octadecane &gt; <i>n</i>-nonadecane &gt; RT 60 &gt; RT 30 &gt; calcium chloride hexa-hydrate &gt; <i>n</i>-docosane &gt; p116 &gt; stearic acid. It could be actively applied to not only the PCMs but also various materials comprehensive performance evaluation ones arising in practice.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 3","pages":"119 - 129"},"PeriodicalIF":0.7,"publicationDate":"2026-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147631826","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}

{"title":"Calculation of the Dissipative Function in the Quantum Case","authors":"S. O. Gladkov","doi":"10.1134/S1063784225601188","DOIUrl":"10.1134/S1063784225601188","url":null,"abstract":"<p>Based on general quantum-mechanical concepts, a method of calculating the dissipative function in the general case for arbitrary interaction is suggested. Through the example of three- and four-particle interactions, sequential calculation of the dissipative function is performed according to general equation (17). From this formula, a purely estimative expression can be derived in the form <span>(leftlangle {dot {Q}} rightrangle approx varepsilon gamma )</span>, where ε is the particle (quasi-particle) energy and γ is the damping coefficient calculated using the quasi-classical kinetic equation.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 2","pages":"71 - 75"},"PeriodicalIF":0.7,"publicationDate":"2026-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147631778","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}

{"title":"Compact Quasi-Elliptic SIW Filter Equivalent to a Waveguide Structure: Size Reduction While Preserving High-Quality Frequency Response","authors":"S. V. Krutiev,&nbsp;S. P. Bukin,&nbsp;D. S. Gubskiy,&nbsp;M. A. Samoletova","doi":"10.1134/S1063784225601395","DOIUrl":"10.1134/S1063784225601395","url":null,"abstract":"<p>This paper considers the design and investigation of a quasi-elliptic bandpass filter implemented on the basis of a rectangular waveguide and its equivalent realization in the form of a substrate integrated waveguide (SIW) structure. The aim of the study is to reduce the mass–dimensional parameters of a classical waveguide filter while preserving the high quality factor and frequency selectivity required for modern communication systems. As a prototype, a four-resonator bandpass filter in a WR-137 rectangular waveguide with quarter-wavelength couplings is used. For this filter, a quasi-elliptic amplitude–frequency response with transmission poles and transmission zeros in the vicinity of the passband is synthesized by means of full-wave electromagnetic simulation. It is shown that the introduction of an additional electric cross-coupling based on a capacitive iris makes it possible to significantly improve the steepness of the response and the suppression of out-of-band signals. Subsequently, the geometrical parameters of the folded waveguide filter are transformed into an equivalent SIW configuration on an FR-4 substrate, implemented using standard printed-circuit technology. Three-dimensional electromagnetic simulation in CST Microwave Studio is carried out, and a prototype is fabricated using a CNC milling machine. Comparison of the simulated and measured amplitude–frequency responses demonstrates good agreement, which confirms the correctness of the synthesis procedure and the high reproducibility of the proposed design. A 34% reduction of the longitudinal size of the filter is achieved while maintaining the shape of the frequency response and an insertion-loss level comparable to that of the waveguide prototype. The obtained results demonstrate the feasibility of transitioning from classical waveguide filters to compact SIW devices with an almost fully shielded structure, promising for applications in telecommunication and radar systems. Special attention is paid to the influence of variations of geometrical parameters on the frequency response, which is important for ensuring technological robustness and series production of the developed filters.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 3","pages":"103 - 110"},"PeriodicalIF":0.7,"publicationDate":"2026-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147631828","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}

{"title":"Ring Multibeam Antenna Array with Frequency Scanning","authors":"E. A. Ishchenko,&nbsp;Yu. G. Pasternak,&nbsp;S. M. Fedorov","doi":"10.1134/S1063784226700015","DOIUrl":"10.1134/S1063784226700015","url":null,"abstract":"<p>Implementation of scanning antennas for noise-immune communication and radar systems is an important and urgent task. One of the most promising methods of beam deflection is frequency scanning that can be effectively combined with switching, which will provide full-azimuth and elevation scanning without using phase shifters. The aim of this work is the study and simulation of a ring multibeam antenna system with the ability to frequency scan and the formation of several beams simultaneously, as well as the simulation with feeding of different ports to assess the capabilities of forming different antenna beams in the multibeam mode also. The study of the possibility of beam deflection in frequency with the determination of the range of operating frequencies is also envisaged. The main results are obtained on the basis of electrodynamic modeling, which has been performed using the finite element method in DS CST Studio Suite 2025. The main methods for analyzing the characteristics are based on the consideration of the radiation patterns, as well as their behavior during diffraction on echelette gratings. The characteristics of the antenna system were obtained in the frequency range from 8.3 to 10 GHz. It is found that the antenna system allows implementing full-azimuth scanning by switching a different number of input ports. It is shown that the proposed design of the antenna system can be controlled both in the beam direction and in the main lobe width by switching a different number of antenna elements with maintaining frequency scanning in a wide range of operating frequencies. It is found that the antenna allows for the formation of two differently directed beams with frequency scanning. The proposed antenna system can be used to implement high-frequency detection of small targets and a noise-immune communication channel with frequency tuning to keep an object in the antenna beam. The peculiarity of the proposed multibeam antenna is the possibility of implementing the two-coordinate scanning based on the frequency scanning and switching connection of antenna elements.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 1","pages":"29 - 33"},"PeriodicalIF":0.7,"publicationDate":"2026-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388491","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}

{"title":"Ultrafast Laser-Induced Forward Gold Transfer for Spatially Selective Formation of Schottky Contacts on n-Type Silicon","authors":"M. S. Kovalev,&nbsp;E. V. Ulturgasheva,&nbsp;S. P. Babina,&nbsp;I. A. Voronov,&nbsp;I. M. Podlesnykh,&nbsp;G. K. Krasin","doi":"10.1134/S1063784225601462","DOIUrl":"10.1134/S1063784225601462","url":null,"abstract":"<p>The Au/<i>n</i>-Si Schottky contacts are formed using the ultrafast laser-induced forward transfer method for laser fluence of 7.8–25.9 J/cm². It is shown that the minimal energy ensures the lowest content of oxygen at the interface, a barrier height of ~0.60 eV, and the nonideality index close to unity, indicating the predominance of thermionic emission. An increase in this energy leads to oxidation, an increase in the barrier heterogeneity, and degradation of rectifying properties despite the apparent increase in the calculated barrier height.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 1","pages":"34 - 38"},"PeriodicalIF":0.7,"publicationDate":"2026-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388534","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}

{"title":"Study of Specific Reliability Indicators of 0.4 kV Power Networks","authors":"A. V. Vinogradova,&nbsp;A. V. Vinogradov,&nbsp;A. V. Bukreev","doi":"10.1134/S1063784225700604","DOIUrl":"10.1134/S1063784225700604","url":null,"abstract":"<p>The reliability of power supply determines the operation of power networks. The literature reviews have revealed that insufficient attention is paid to the research of specific reliability indices necessary for planning and evaluation of energy saving efficiency. Therefore, the purpose of the work is to study the specific reliability indicators of 0.4 kV power networks. Among the analyzed indicators, we consider the flow of failures, the flow of intentional outages, specific values of disconnected power and undersupply of electricity, and others. The authors have analyzed statistical data on emergency and planned outages of 0.4 kV power networks in the Orel region over the period 2018–2023. In total, 12 787 overhead power lines with a total length of more than 10 thousand kilometers have been examined. Based on the analysis, the authors identify the values of specific reliability indicators and trends in their changes over 6 years and analyze probable reasons for these changes. It has been revealed that the values of the failure flow parameters do not exceed the reference values until 2022 inclusive, and in 2023, they exceed the reference values by 1.2 times. In 2022–2023, there was a significant increase in the number of both emergency and intentional (planned) outages; the flow of failures per 100 km of 0.4 kV lines in 2023 was 29 per year, and intentional outages constituted 71 per year. The values of specific disconnected power per outage decreased by 17.5 times in 2023 as compared to 2018, the average value per outage was 0.0009 MW. The specific value of undersupply of electricity per consumer per year is in the range between 1 and 5.7 MWh/consumer for emergency shutdowns, and 3 to 8.1 MW h/consumption, according to the new plan. Specific reliability indices allow assessing the efficiency of 0.4 kV distribution networks in a particular region and can be used in assessing the effect of implementing measures to improve the reliability of power supply.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 1","pages":"39 - 44"},"PeriodicalIF":0.7,"publicationDate":"2026-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388537","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}

{"title":"On the Electrical Strength of the Accelerating Gap in a Forevacuum Plasma Electron Source","authors":"V. A. Burdovitsin,&nbsp;L. J. Ngon A Kiki,&nbsp;E. M. Oks,&nbsp;F. A. Sukhovolsky","doi":"10.1134/S106378422560122X","DOIUrl":"10.1134/S106378422560122X","url":null,"abstract":"<p>Some aspects determining the electrical strength of the accelerating gap in a fore-vacuum-pressure plasma-cathode electron beam source utilizing helium and argon as the working gas were explored. Penetration of plasma into the accelerating gap is the cause of breakdown. We find that gap breakdown occurs at larger emission hole diameter and at higher plasma density in helium than in argon. The greater stability of the plasma boundary in helium is explained by the observed greater anode potential drop and consequently greater sheath thickness.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 1","pages":"25 - 28"},"PeriodicalIF":0.7,"publicationDate":"2026-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147388531","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}