Physics of Atomic Nuclei最新文献_第10页

Regularities of the Formation of the Structure of Rapidly Quenched Powder of a Heat-Resistant Ti-Based Alloy Produced by PREP Method 用 PREP 法生产的耐热钛基合金快速淬火粉末结构形成的规律性

IF 0.3 4区物理与天体物理

Physics of Atomic Nuclei Pub Date : 2025-02-22 DOI: 10.1134/S1063778824090370

A. V. Shulga

{"title":"Regularities of the Formation of the Structure of Rapidly Quenched Powder of a Heat-Resistant Ti-Based Alloy Produced by PREP Method","authors":"A. V. Shulga","doi":"10.1134/S1063778824090370","DOIUrl":"10.1134/S1063778824090370","url":null,"abstract":"A multiscale study of the structure of spherical particles (granules) of rapidly quenched powder of a heat-resistant (α + β) titanium-based alloy obtained by the PREP method, which has been subsequently used for the manufacture of products using PM HIP technology, has been carried out. Metallography LM, SEM, EDX, OIM methods are used to study the structure of granules of different sizes. The influence of the granule size and vacuum heat treatment at temperatures in the fields of the (α + β) and β phases on the regularities of the formation of the microstructure of granules has been revealed. The dendrite microstructure of grains of the metastable β phase has been found in the particles (granules) of the original rapidly quenched PREP powder. Dendrite segregation of alloying elements is clearly revealed in larger particles, for example, for Mo. In smaller particles, the formation of a more highly dispersed structure has been observed. The effect of granule size decreasing on the reduction of the size parameter of the dendritic structure (SDAS) has been determined. Schematic TTT diagrams of phase transformations in the studied alloy, including crystallization, martensitic transformation, and normal diffusion transformation β → (α + β), have been constructed.","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 11","pages":"1596 - 1608"},"PeriodicalIF":0.3,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471835","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

Analysis of the Efficiency of Flow Accumulators of Phase Transition Heat 相变热流动蓄能器效率分析

IF 0.3 4区物理与天体物理

Physics of Atomic Nuclei Pub Date : 2025-02-22 DOI: 10.1134/S1063778824090321

N. A. Rossikhin, A. G. Polyanskiy

引用次数: 0

Designing an Irradiator for the In-Reactor Testing of Absorbing Materials of Nuclear Reactor Control Bodies 设计用于核反应堆控制体吸收材料堆内测试的辐照装置

IF 0.3 4区物理与天体物理

Physics of Atomic Nuclei Pub Date : 2025-02-22 DOI: 10.1134/S1063778824100338

V. S. Moiseev, N. K. Kalinina, M. S. Kaplina, N. Yu. Marikhin, D. S. Moiseev

{"title":"Designing an Irradiator for the In-Reactor Testing of Absorbing Materials of Nuclear Reactor Control Bodies","authors":"V. S. Moiseev, N. K. Kalinina, M. S. Kaplina, N. Yu. Marikhin, D. S. Moiseev","doi":"10.1134/S1063778824100338","DOIUrl":"10.1134/S1063778824100338","url":null,"abstract":"The Atomic Reactor Research Institute is developing the design of an irradiator for conducting in-reactor tests of neutron-absorbing materials in nuclear reactor control systems. Dysprosium titanate is chosen as the absorbing material due to its high chemical and thermal stability, along with its enhanced corrosion and radiation resistance. The irradiator’s design consists of a suspension with a flange, a working section where the sample with the absorbing material is placed, a flow separator, and an absorbing screen. The flow separator is made of 12Kh18N10T stainless steel. The absorbing screen, designed to reduce the proportion of thermal neutrons in the spectrum, consists of two cylinders made of boron steel and aluminum, encased in 12Kh18N10T stainless steel. Neutron-physical calculations are made using the MCU-FR code, in addition to thermal-hydraulic calculations of the RD design obtained using the SolidWorks software. The calculations show that using a screen made of boron steel and aluminum allows the ratio of fast and thermal neutron flux to be adjusted during in-reactor tests of the absorbing materials. Results from thermal-hydraulic calculations show that using high-temperature loop installation VP-3 of the SM-3 reactor under conditions of forced circulation ensures the required temperature regime for irradiating a sample with dysprosium titanate in the third row of the SM-3 reflector.","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 11","pages":"1640 - 1644"},"PeriodicalIF":0.3,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471878","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

Multipoint Kinetics Model with Power Reactivity Effect for the Axial Offset Control in the VVER-1200 Nuclear Reactor in the Load-Following Mode 负载跟随模式下VVER-1200核反应堆轴向偏移控制的功率反应效应多点动力学模型

IF 0.3 4区物理与天体物理

Physics of Atomic Nuclei Pub Date : 2025-02-22 DOI: 10.1134/S1063778824100399

S. S. Pravosud, Ya. O. Yakubov, V. A. Susakin

{"title":"Multipoint Kinetics Model with Power Reactivity Effect for the Axial Offset Control in the VVER-1200 Nuclear Reactor in the Load-Following Mode","authors":"S. S. Pravosud, Ya. O. Yakubov, V. A. Susakin","doi":"10.1134/S1063778824100399","DOIUrl":"10.1134/S1063778824100399","url":null,"abstract":"In this work, a multipoint kinetics model for a VVER-1200 nuclear reactor consisting of a diverse (two-point, four-point, six-point, eight-point, and ten-point) set of point kinetics models in the axial direction that are coupled to each other by coefficients determined in the diffusion approximation is proposed and simulated in MATLAB environment. For a more precise description of the dynamic modes of the reactor, the model is provided with power reactivity feedback determined by temperature effects of reactivity and Mann’s approach to describing thermal-hydraulic processes in which it is assumed that two coolant nodes are adjacent to a single fuel node. The effect of different numbers of delayed neutron groups on the accuracy and speed of simulation of transient processes in the load-following mode is tested on the model with four axial points. In addition, a new mathematical model of control rods (CRs) is proposed that uses a combination of sign functions to sequentially influence all nodes during insertion or withdrawal. The results of numerical simulation show that the statistical accuracy of the proposed model is satisfactory, and general assumptions about transients are consistent with their physical definitions. This research contributes to the advancement of point nuclear reactor models for improving the synthesis of an automatic power controller.","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 11","pages":"1579 - 1590"},"PeriodicalIF":0.3,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471872","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

Developing a Two-Section 8-MeV Linear Electron Accelerator for Applied Research 用于应用研究的两段式8-MeV直线电子加速器

IF 0.3 4区物理与天体物理

Physics of Atomic Nuclei Pub Date : 2025-02-22 DOI: 10.1134/S1063778824100533

R. A. Zbruev, A. A. Batov, T. V. Bondarenko, S. M. Polozov, M. V. Lalayan

引用次数: 0

Interaction of Chrome Coating with Cladding Made of EP823-Sh Steel in the Temperature Range 420–650°C EP823-Sh钢覆层与铬涂层在420 ~ 650℃范围内的相互作用

IF 0.3 4区物理与天体物理

Physics of Atomic Nuclei Pub Date : 2025-02-22 DOI: 10.1134/S1063778824100144

R. Sh. Isayev, P. S. Dzhumaev

{"title":"Interaction of Chrome Coating with Cladding Made of EP823-Sh Steel in the Temperature Range 420–650°C","authors":"R. Sh. Isayev, P. S. Dzhumaev","doi":"10.1134/S1063778824100144","DOIUrl":"10.1134/S1063778824100144","url":null,"abstract":"Chromium coatings can significantly improve the corrosion resistance of fuel rod cladding made from EP823-Sh steel in liquid lead environments at temperatures up to 650°C. To ensure the long-term effectiveness of the coating, it is crucial to prevent the diffusion interaction between the chromium layer and the underlying steel throughout the operational lifespan of the fuel rod. High-temperature tests on samples reveal a coating-steel interaction layer. At 420°C, with a holding time of 1000 h, the coating retains its adhesion to the steel, and no interaction is observed between the two materials. However, at 540°C and 650°C with a holding time of 1000 h, a diffusion layer with uneven thickness (ranging from 150 to 600 nm) forms at the coating-steel interface. This layer, which has a complex composition, effectively blocks further diffusion of elements from both the coating and the steel. The EP823-Sh steel contains approximately 1 wt % molybdenum and tungsten, which promote the coating-steel interaction. Overall, the results suggest that chromium coatings are a promising option for enhancing the corrosion resistance and longevity of fuel rod cladding made from EP823-Sh steel.","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 11","pages":"1689 - 1695"},"PeriodicalIF":0.3,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471909","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 Dispersed Systems of Metal Oxide Nanoparticles Obtained in Plasma Discharge in Liquids under the Effect of Ultrasound 超声作用下等离子体放电液体中金属氧化物纳米颗粒分散体系的演化

IF 0.3 4区物理与天体物理

Physics of Atomic Nuclei Pub Date : 2025-02-22 DOI: 10.1134/S1063778824090084

O. A. Butusova, S. A. Sitnikov, N. A. Bulychev

{"title":"Evolution of Dispersed Systems of Metal Oxide Nanoparticles Obtained in Plasma Discharge in Liquids under the Effect of Ultrasound","authors":"O. A. Butusova, S. A. Sitnikov, N. A. Bulychev","doi":"10.1134/S1063778824090084","DOIUrl":"10.1134/S1063778824090084","url":null,"abstract":"In this work, nanoparticles of aluminum, copper, and titanium oxides were obtained by plasma discharge in the liquid phase (ethylene glycol, water) under the influence of intense ultrasound. Particular procedures have been developed for creating sedimentation-stable aqueous dispersed systems of nanoparticles of copper(II), aluminum, and titanium(IV) oxides. Nanoparticles are stabilized by the nonionic surfactant Tween 85 at its optimal concentration of 3 mmol/L and with a metal oxide content of up to 0.2 g/L. It has been shown that stable dispersed systems of particles are obtained by adding a surfactant to the initial system, followed by diluting it with distilled water and ultrasonic dispersion. Using scanning electron microscopy, it was shown that nanoparticles of copper, aluminum, and titanium oxides have a spherical shape. Highly stable dispersed systems with a narrow particle size distribution were obtained: 20 nm for Al2O3, 40 nm for CuO, and 30 nm for TiO2 after membrane filtration of the initial dispersed systems. Electrokinetic studies have shown that the surface of nanoparticles of copper, aluminum, and titanium oxides becomes negatively charged when stabilized by Tween-85. The average value of the ξ-potential was –20 ± 5 mV. The study of the kinetics of growth and stability of nanoparticles showed that titanium oxide nanoparticles, under equal conditions, have higher aggregation stability compared to copper and aluminum oxides. The stability time of the obtained samples was approximately 1.5 months.","PeriodicalId":728,"journal":{"name":"Physics of Atomic Nuclei","volume":"87 11","pages":"1722 - 1726"},"PeriodicalIF":0.3,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471928","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

Controlling the Luminescence of Quantum Dots in Hybrid Structures Based on Porous Silicon 多孔硅杂化结构中量子点发光的控制

IF 0.3 4区物理与天体物理

Physics of Atomic Nuclei Pub Date : 2025-02-22 DOI: 10.1134/S1063778824100259

I. S. Kriukova, E. A. Granizo, A. A. Knysh, P. S. Samokhvalov, I. R. Nabiev

引用次数: 0

CaCO3 Microparticle-Based Carriers: Optimization of BSA Loading by Coprecipitation 基于CaCO3微粒的载体：共沉淀法优化BSA负载

IF 0.3 4区物理与天体物理

Physics of Atomic Nuclei Pub Date : 2025-02-22 DOI: 10.1134/S1063778824100041

L. Biny, D. Kalenichenko, I. Nabiev, A. Sukhanova

引用次数: 0

Search for Neutrino–Gravitational Correlations on the OGRAN and BUST Underground Detectors 在OGRAN和BUST地下探测器上寻找中微子-引力相关性