Journal of the Korean Physical Society最新文献

{"title":"Nonlinear shock dynamics in charge-fluctuating dusty plasmas: the role of viscosity and mobility","authors":"Noor Ahmad Nayan,&nbsp;M. Himel Azad,&nbsp;M. Masum Haider","doi":"10.1007/s40042-025-01299-5","DOIUrl":"10.1007/s40042-025-01299-5","url":null,"abstract":"<div><p>This study investigates the influence of viscosity contributions from ion and dust particles on the dynamics of charge fluctuating dusty plasma. The analysis incorporates the motion of both positively charged ions and negatively charged, lighter dust particles, which are treated as mobile constituents alongside Maxwellian electrons. Utilizing the reductive perturbation technique, we derive the Korteweg–de Vries–Burgers (KdV–Burgers) equation, which serves as a framework for exploring the characteristics of dust and ion acoustic shock profiles. Our findings indicate that the viscosity within the dusty plasma plays a pivotal role in the dissipation processes, significantly impacting the propagation characteristics of dust and ion acoustic shocks. Furthermore, the study reveals that the nonlinear and dispersive coefficients are altered when accounting for the mobility of dust particles in conjunction with ions. As a result, both the amplitude and width of the dust and ion acoustic shock waves exhibit deviations from those observed in traditional dust-ion-acoustic waves, highlighting the complex interplay between particle dynamics and wave propagation in dusty plasma environments.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 7","pages":"605 - 614"},"PeriodicalIF":0.8,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143749267","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":"Pressure–temperature limit for APR-1400 reactor pressure vessel nozzles","authors":"Hyunchul Lee,&nbsp;Jae-Boong Choi","doi":"10.1007/s40042-025-01305-w","DOIUrl":"10.1007/s40042-025-01305-w","url":null,"abstract":"<div><p>The reactor pressure vessel (RPV) is a critical component of nuclear power plants (NPPs), designed to endure high temperatures and pressures to prevent coolant leakage. During operation, the RPV is irradiated by fast neutrons (E &gt; 1 MeV), which reduces the fracture toughness of its materials. Regulatory rules require monitoring the neutron irradiation embrittlement to ensure the fracture toughness satisfies the criteria throughout the plant design life and these rules also require evaluating the pressure–temperature (P–T) limit curves considering the neutron irradiation embrittlement. Traditionally, P–T limit curves have been developed based on the beltline region, which is mostly affected by the neutron exposure. However, the geometric discontinuities of the RPV nozzles cause the higher stresses in that region, which potentially requires more conservative operating limits. In this study, P–T limit curves for APR-1400 (Advanced Power Reactor 1400) RPV nozzles are developed using the finite element analysis (FEA) model and the resultant stress intensity factor under internal pressure and cooldown conditions. These nozzle P–T limit curves are also compared to the traditional beltline region P–T limit curves.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 6","pages":"555 - 565"},"PeriodicalIF":0.8,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143612246","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":"Accuracy of extracted optical conductivity by Kramers–Kronig analysis from reflectivity spectrum","authors":"Jeong Woo Han","doi":"10.1007/s40042-025-01308-7","DOIUrl":"10.1007/s40042-025-01308-7","url":null,"abstract":"<div><p>Kramers–Kronig (KK) analysis has been widely used to extract the optical conductivity spectrum from a broad range of reflectance spectra from far-infrared to ultraviolet frequency ranges. In this study, we present how measurement uncertainty in the reflectivity spectrum affects the extracted optical conductivity spectrum obtained through KK analysis. We consider realistic experimental errors that can easily occur in reflectance measurement environments: (1) a rigid shift of the absolute reflectance in the whole measurement frequency window, and (2) a linear decrement of reflectance with increasing frequency. Our investigation reveals that the reliability of the extracted optical conductivity spectrum, especially in the lower frequency range, should be carefully addressed, particularly when the reflectance is above approximately 95%.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 6","pages":"550 - 554"},"PeriodicalIF":0.8,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143612248","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":"Development of a radioactivity estimation algorithm for an arbitrary geometry radiation source in nuclear power plant workspace","authors":"Ju Young Kim,&nbsp;Ji Woo Kim,&nbsp;Min Seong Kim,&nbsp;Dae Ho Lee,&nbsp;Kwang Pyo Kim","doi":"10.1007/s40042-025-01300-1","DOIUrl":"10.1007/s40042-025-01300-1","url":null,"abstract":"<div><p>Nuclear power plant workers can be exposed to radiation under various working conditions, such as during normal operation, maintenance period, and emergency. To establish an optimal work plan, radiation dose prediction and assessment must be conducted in advance. Radioactivity data are essential to assess radiation dose. However, in some situations, these data may not be available, and analyzing precise activity of radiation source in all nuclear power plant work environments may require significant time and financial resource. Therefore, an algorithm is needed that can swiftly estimate the radioactivity of the radiation sources utilizing the radiation dose rate which are readily available data. The objective of this study is to develop an algorithm for estimating the radioactivity of arbitrary geometry radiation sources within the nuclear power plant workspaces. To achieve this, an algorithm was initially developed to estimate the radioactivity of point sources and arbitrary geometry radiation sources. Subsequently, scenarios for the point sources and cylindrical volume sources were established, and the effectiveness of the algorithm was validated with applying these scenarios. In the radioactivity estimation algorithm for the point sources, the radioactivity was estimated by reverse-calculating the external exposure dose assessment equation from the radiation dose rate data. However, various uncertainties may exist in the radiation dose rate data. Because limitations exist in deriving an exact activity value, a numerical analysis method was employed to obtain an optimal solution. The estimation procedure was divided into five steps: (1) obtaining input parameters, (2) establishing the simultaneous equation, (3) deriving an initial solution set, (4) deriving the approximate solution set, and (5) calculating uncertainty and determining the optimal solution. Additionally, a radioactivity estimation algorithm for arbitrary geometry radiation sources was developed integrating the point source radioactivity estimation algorithm and the point-kernel method. The estimation procedure was divided into two steps: (1) point segmentation of the arbitrary geometry radiation source and (2) estimation of radioactivity for the segmented point source. In the validation results of each algorithm, the error ratio between the actual and the estimated values ranged from approximately 1.19% to 11.2%. The results of this study are expected to be utilized in future for optimizing work plans in nuclear power plant workspaces where radioactivity information is unavailable.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 6","pages":"566 - 574"},"PeriodicalIF":0.8,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143612247","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":"Dirac analysis of 3He scattering at intermediate and low energy","authors":"A. F. Hamza","doi":"10.1007/s40042-025-01292-y","DOIUrl":"10.1007/s40042-025-01292-y","url":null,"abstract":"<div><p>The Dirac optical model is extended to describe the scattering of the ³He particles, which are regarded as spin-half one-body particles. The model is employed for ³He + ¹²C, ³He + ⁵⁸Ni, and ³He + ⁹⁰Zr elastic scattering at 443 MeV. The scalar and vector optical potentials are derived, producing a good description of the experimental differential cross-sections and polarization data. Furthermore, a satisfactory description of the elastic scattering data for the ³He + ⁹⁰Zr over an incident energy range of 29.8–217 MeV is obtained, which confirms the validity of the Dirac optical model at intermediate and low energy. A wine-bottle-shaped potential is observed for the description of ³He + ⁹⁰Zr scattering at incident energies of 43.3 and 72.3 MeV per nucleon; this is analogous to the behavior of potentials describing the scattering of protons and deuterons. Volume integrals of effective central optical potentials for ³He scattering are discussed, and the calculated total cross-sections are compared with the available measured values.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 6","pages":"473 - 485"},"PeriodicalIF":0.8,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143612245","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":"Structure, microstructure and hyperfine properties of nanostructured FeAl and FeAl–2wt%Sn powders","authors":"Z. Hamlati,&nbsp;F. Otmane,&nbsp;A. Mahi,&nbsp;H. Mechri,&nbsp;W. Laslouni","doi":"10.1007/s40042-025-01304-x","DOIUrl":"10.1007/s40042-025-01304-x","url":null,"abstract":"<div><p>Fe–Al and Fe–Al–Sn alloys were prepared using the high-energy ball milling process. The effects of adding small amounts of tin on structural and microstructural properties were studied using X-ray diffraction (XRD), ⁵⁷Fe Mössbauer spectroscopy, and scanning electron microscopy. The Mössbauer spectra of all samples reveal the presence of both magnetic and paramagnetic components. For Fe–Al alloys, the spectrum obtained after 1 h of milling contains a magnetically split sextet with a hyperfine field (<i>H</i>ₕ_f) of 33.1 T and an isomer shift (IS) of 0.00 mm/s, characteristic of the starting bcc Fe powder. The spectrum recorded after 32 h of milling indicates more advanced alloying. At this stage, a significant decrease in the intensity of the bcc Fe sextet in favor of the paramagnetic quadrupole doublet’s intensity was observed. The doublet seen in the center of the Mössbauer spectrum was attributed to the paramagnetic Fe(Al) solid solution. The relative fraction of this paramagnetic component increased to approximately 63.11%, with an isomer shift (IS) of 0.21 mm/s. For the Fe–Al–Sn alloy, the relative fraction of the paramagnetic component was found to be 33.33%.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 6","pages":"535 - 549"},"PeriodicalIF":0.8,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143612167","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":"Improving the electrical properties and stability of amorphous indium gallium zinc oxide thin-film transistors through ozone treatment","authors":"Yeongtae Choi,&nbsp;Seokyoon Shin,&nbsp;Changwoo Byun,&nbsp;Hee-Soo Kim,&nbsp;Hyeongtag Jeon","doi":"10.1007/s40042-025-01290-0","DOIUrl":"10.1007/s40042-025-01290-0","url":null,"abstract":"<div><p>The effect of ozone (O₃) treatment on amorphous indium gallium zinc oxide (a-IGZO) thin-film transistors (TFTs) was investigated. The study utilized O₃ exposure durations ranging from 60 to 600 s, with a concentration maintained at 100 g/m³. The results indicated that a-IGZO TFTs subjected to O₃ treatment for 600 s exhibited enhanced electrical characteristics in comparison to their untreated counterparts. Specifically, there was an increase in saturation mobility (<i>µ</i>_sat) from 4.54 to 4.85 cm²/Vs, a decrease in subthreshold swing (S.S) from 0.41 to 0.33 V/decade, and an improvement in the on/off current ratio (<i>I</i>_on/off) from 1.23 × 10⁶ to 2.54 × 10⁷. Furthermore, the O₃-treated a-IGZO TFTs demonstrated greater stability in threshold voltage (<i>V</i>_th) shifts when subjected to humidity and negative bias illumination stability (NBIS) conditions. Notably, the Vth shift for the a-IGZO TFT treated with O₃ for 600 s remained relatively stable (Δ<i>V</i>_th &lt;  – 0.3 V) under NBIS conditions over 3 h. These findings suggest that the 600-s O₃ treatment highly effective in reducing oxygen vacancy (<i>V</i>_O) defects within the a-IGZO channel.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 6","pages":"529 - 534"},"PeriodicalIF":0.8,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143612019","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":"Design of an innovative surface-volume dielectric barrier discharge ozone generator for water treatment applications","authors":"Raouti Driss,&nbsp;Kamel Nassour,&nbsp;Bouanane Abdelkrim,&nbsp;Tahtah Abdelkarim,&nbsp;Said Nemmich,&nbsp;Ghaitaoui Essama Ahmed,&nbsp;Amar Tilmatine","doi":"10.1007/s40042-025-01298-6","DOIUrl":"10.1007/s40042-025-01298-6","url":null,"abstract":"<div><p>The study presents the development of a novel hybrid ozone generator utilizing dielectric barrier discharge (DBD) technology for water treatment applications. This generator features a cylindrical design with multiple stainless steel balls as the internal high-voltage electrode, enhancing the electric field and increasing ozone concentration. Key results indicate that the hybrid configuration outperforms traditional volume and surface DBD systems in both ozone production and energy efficiency. Specifically, the hybrid reactor with smaller balls achieved ozone concentrations approximately 2 to 3 times higher than those produced by surface and volume DBD generators. Additionally, energy efficiency exceeded 500 g/kWh at low voltages for the hybrid system, significantly surpassing the efficiencies of the other configurations. The experimental results demonstrate that the hybrid reactor can decolorize contaminated water more effectively, achieving near-complete discoloration in just 20 min, compared to 30 min for conventional systems. This research highlights the potential of hybrid DBD systems in improving ozone generation efficiency for environmental applications, particularly in water treatment processes.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 6","pages":"512 - 521"},"PeriodicalIF":0.8,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143612150","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":"Plasma atomic layer etching of SiO2 and Si3N4 using low global warming hexafluoropropene","authors":"Minsuk Choi,&nbsp;Hyeongwu Lee,&nbsp;Taeseok Jung,&nbsp;Minsung Jeon,&nbsp;Heeyeop Chae","doi":"10.1007/s40042-024-01258-6","DOIUrl":"10.1007/s40042-024-01258-6","url":null,"abstract":"<div><p>In this work, plasma atomic layer etching (ALE) process was developed for silicon dioxide (SiO₂) and silicon nitride (Si₃N₄) in an inductively coupled plasma (ICP) reactor with octafluorocyclobutane (c-C₄F₈), trifluoromethane (CHF₃) or low global warming hexafluoropropene (C₃F₆) plasma. The SiO₂ and Si₃N₄ surface was fluorinated with the c-C₄F₈, CHF₃ and C₃F₆ gases in the surface modification step and the fluorinated surface was etched by ion bombardment using argon (Ar) plasma in the removal step. c-C₄F₈ plasma resulted in the formation of a fluorine-rich fluorocarbon layer after the modification step, followed by C₃F₆ and CHF₃ plasma, indicated by the highest F 1s/C 1s ratio of the fluorocarbon layer. Self-limiting characteristics were observed at 90 s of Ar plasma time for both SiO₂ and Si₃N₄. The etch per cycle (EPC) was investigated depending on ion energy in the removal step. The ALE window region was identified in the energy range of 35 ~ 45 V and the EPC was found to be 17.2 Å/cycle for SiO₂ and 6.9 Å/cycle for Si₃N₄ with C₃F₆ plasma. Infinite SiO₂/Si₃N₄ etch selectivity was achieved at early stages of etching due to the higher fluorocarbon consumption rate of SiO₂ during the removal step. The surface roughness was reduced from 0.35 nm to 0.28 nm for SiO₂ and from 0.26 nm to 0.21 nm for Si₃N₄ before and after the etch process with C₃F₆ plasma, confirming the advantage of the ALE process.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 6","pages":"501 - 511"},"PeriodicalIF":0.8,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143612149","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":"Improving endurance and thermal stability in IGZO-based ReRAM using an a-BN intermediate layer","authors":"Jaewook Park,&nbsp;Won Suk Oh,&nbsp;Jaegoo Lee,&nbsp;Hongseok Oh","doi":"10.1007/s40042-025-01295-9","DOIUrl":"10.1007/s40042-025-01295-9","url":null,"abstract":"<div><p>We report the fabrication of IGZO-based resistive random-access memory (ReRAM) and discuss the improved reliability achieved with an amorphous boron nitride (a-BN) intermediate layer. The IGZO ReRAM with Ag/IGZO/ITO structure exhibited typical resistive switching behaviors. Importantly, using a-BN intermediate layer between the IGZO channel and the Ag top electrode greatly improved the device’s reliability, including long-term endurance and high-temperature stability. The impact of the a-BN intermediate layer on the conduction mechanism is analyzed using temperature-dependent double logarithm I–V analysis, and the possible mechanism for improved endurance and thermal stability is discussed.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"86 6","pages":"522 - 528"},"PeriodicalIF":0.8,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143612216","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}