Journal of the Korean Physical Society最新文献_第4页

Thermal and radiative oscillations of three coronal loops in AR 11092 ar11092中三个日冕环的热与辐射振荡

IF 1 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2026-06-02 DOI: 10.1007/s40042-026-01660-2

Marjan Yousefzadeh Shabestari, Narges Fathalian

{"title":"Thermal and radiative oscillations of three coronal loops in AR 11092","authors":"Marjan Yousefzadeh Shabestari, Narges Fathalian","doi":"10.1007/s40042-026-01660-2","DOIUrl":"10.1007/s40042-026-01660-2","url":null,"abstract":"<div>We observed simultaneous intensity and temperature oscillations in three coronal loop slices of AR 11092, using four EUV channels of AIA/SDO. We applied AIA/SDO data of AR 11092 from 13:30–18:00 UT on August 1, 2010. These slices have lengths of 33, 29, and 18 Mm analyzed at the wavelengths of (131 , )Å, (171 ,)Å, (193 ,)Å, and (211 ,)Å. Exponential fits to intensity profiles enabled estimations of oscillation parameters: period, damping time, phase speed, and damping quality factor. Mean periods of intensity oscillations for slices (text {S}_1), (text {S}_2), and (text {S}_3) were (mathrm {26.2pm 1.2}), (mathrm {26.1pm 1.0}), and (mathrm {28.2pm 1.2}) minutes, and for temperature oscillations, 63, 67, and 54 min, respectively. Cross-correlation analysis across wavelengths showed the highest coefficients between (131 ,)Å, and (171 ,)Åfor all slices, with strong correlations across all wavelength pairs. Temperature diagnostics using the CHIANTI code yielded loop mean temperature (log) between (mathrm {5.6}), and (mathrm {7.2}), with closely matched values among loops. We derived phase speed ((V_{textrm{ph}})), and sound speed ((C_{textrm{s}})) for (text {S}_1): (42pm 2,mathrm {km/s}), and (215pm 102,mathrm {km/s}), for (text {S}_2): (37.0pm 1.4,mathrm {km/s}), and (215pm 76,mathrm {km/s}), for (text {S}_3): (21.3pm 0.9,mathrm {km/s}), and (271pm 95,mathrm {km/s}), respectively. In all cases, (V_{textrm{ph}}) < (C_{textrm{s}}), consistent with slow-mode waves. These results confirmed the presence of slow-mode waves in these three loops. Our study reveals simultaneous oscillations in intensity and temperature, with measurable phase differences, within post-flare coronal loops.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"89 6","pages":"590 - 607"},"PeriodicalIF":1.0,"publicationDate":"2026-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148909566","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 study of 28 GHz fundamental-frequency electron cyclotron resonance heating on the CN-H1 stellarator CN-H1仿星器28 GHz基频电子回旋共振加热的数值研究

IF 1 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2026-05-27 DOI: 10.1007/s40042-026-01661-1

Xudong Han, Pingwei Zheng, Lihua He, Chunyan Li, Zhengkun Gao, Lan Yin, Xianghui Yin, Dong Xiang, Xueyu Gong, Qianhong Huang

{"title":"Numerical study of 28 GHz fundamental-frequency electron cyclotron resonance heating on the CN-H1 stellarator","authors":"Xudong Han, Pingwei Zheng, Lihua He, Chunyan Li, Zhengkun Gao, Lan Yin, Xianghui Yin, Dong Xiang, Xueyu Gong, Qianhong Huang","doi":"10.1007/s40042-026-01661-1","DOIUrl":"10.1007/s40042-026-01661-1","url":null,"abstract":"<div>The Chinese Heliac One (CN-H1) is planned to employ two electron cyclotron resonance heating (ECRH) systems operating at 2.45 GHz and 28 GHz for plasma start-up and heating, with a maximum designed magnetic field of 1 T. The ray-tracing code TRAVIS is employed to evaluate the power absorption efficiency of the 28 GHz fundamental-frequency ordinary (O1) and extraordinary (X1) modes in CN-H1 plasma. During the low-density, low-temperature start-up phase, the single pass absorption of the O1 mode across the resonance layer is weak, with the absorption efficiency not exceeding 20% when the electron temperature is below 0.4 keV. However, the absorption efficiency of the O1 mode is significantly enhanced when the wave undergoes multiple reflections and repeatedly traverses the resonance layer. Under specific conditions, the X1 mode injected from the low field side can be efficiently absorbed by low-temperature, low-density plasma, with single pass absorption efficiencies exceeding 90%, making it suitable for plasma start-up. In addition, the optimal injection angle range for heating overdense plasma via O–X–B mode conversion of the 28 GHz O1 mode is obtained through a parameter scan. Based on these results, a scheme for plasma start-up and sustainment using 28 GHz fundamental-frequency electron cyclotron waves on the CN-H1 device is proposed.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"89 4","pages":"367 - 378"},"PeriodicalIF":1.0,"publicationDate":"2026-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148704208","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

Parameter diagnosis for the plasma of artificially triggered lightning based on collisional–radiative model 基于碰撞辐射模型的人工触发闪电等离子体参数诊断

IF 1 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2026-05-27 DOI: 10.1007/s40042-026-01656-y

Yiqi Wang, Xiaozhi Shen, Huaming Zhang, Qi Qi, Cuicui Sang, Yongliang Zhang, Zhi Li

{"title":"Parameter diagnosis for the plasma of artificially triggered lightning based on collisional–radiative model","authors":"Yiqi Wang, Xiaozhi Shen, Huaming Zhang, Qi Qi, Cuicui Sang, Yongliang Zhang, Zhi Li","doi":"10.1007/s40042-026-01656-y","DOIUrl":"10.1007/s40042-026-01656-y","url":null,"abstract":"<div>Based on the collisional–radiative model, the energy levels, transition rates, and collision excitation rate coefficients of N II ions were calculated by implementing the Flexible Atomic Code. The line intensity of characteristic spectral lines for N II ions was simulated, which shows that the variations of electron temperature and electron density can affect the simulation of line intensity. In addition, the plasma spectra for an artificially triggered lightning, derived from Guangdong, China, were adopted to be simulated. It is found that when the simulated spectrum is well matched with the experimental one, its plasma environment becomes as 32,000 K and 10(^{17}) cm(^{-3}), which is called Visual-Spectra-Matching (VSM) method. Moreover, through adopting the Multi-Spectra-Ratio-Matching (MSRM) method, the results are diagnosed as 32,000 ± 103 K and (1.38 ± 0.6) (times ) 10(^{17}) cm(^{-3}). Good agreements can be found in the comparisons among VSM, MSRM, and other measurements.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"89 4","pages":"379 - 391"},"PeriodicalIF":1.0,"publicationDate":"2026-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148704213","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

Redistribution of cations and enhanced magnetic properties in thermally processed Zn–Co–Ni ferrite nanoparticles 热处理Zn-Co-Ni铁氧体纳米颗粒中阳离子的重新分布和磁性能的增强

IF 1 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2026-05-13 DOI: 10.1007/s40042-026-01659-9

Hero S. Ahmed, Sarkawt A. Hussen, Ali M. Mohammad

{"title":"Redistribution of cations and enhanced magnetic properties in thermally processed Zn–Co–Ni ferrite nanoparticles","authors":"Hero S. Ahmed, Sarkawt A. Hussen, Ali M. Mohammad","doi":"10.1007/s40042-026-01659-9","DOIUrl":"10.1007/s40042-026-01659-9","url":null,"abstract":"<div>Using the sol–gel auto-combustion process, the nanocrystalline Zn0.2Co0.2Ni0.6Fe2O4 was created with the focus on analyzing the effect of calcination temperature on its structural and magnetic properties, specifically cation redistribution. The formation of the cubic spinel structure was verified by X-ray diffraction. As the calcination temperature increased from 400 to 600 °C, the crystallite size grew from 38.384 to 49.776 nm. Zn2+ ions were found to mainly occupy tetrahedral (A) sites according to Rietveld analysis, but Ni2+, Co2+, and Fe3+ ions were distributed over both A and B sites, suggesting a mixed spinel structure. The values of experimental and theoretical lattice parameters were very close to each other, confirming the successful cation distribution into their corresponding lattice sites. Two primary absorption bands were found by Fourier-transform infrared spectroscopy: a high-frequency absorption band (ν2) at around 560.367 and 569.323 cm−1 and a low-frequency absorption band (ν1) between 375.936 and 383.264 cm−1. The bands correspond to metal–oxygen stretching vibrations at tetrahedral and octahedral sites, confirming the spinel structure and accurate cation-site distribution. Depending on the calcination temperature, field emission scanning electron microscopy showed that most particles were spherical, with some agglomeration. Magnetic measurements at ambient temperature using a vibrating sample magnetometer showed that saturation magnetization decreased from 57.972 to 56.096 emu/g with increasing temperature. The nanoferrites exhibited soft magnetic behavior at room temperature, indicating potential for high-frequency and microwave applications, with coercive field values ranging from 325.284 to 364.915 Oe, typical of soft magnetic materials.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"89 4","pages":"400 - 415"},"PeriodicalIF":1.0,"publicationDate":"2026-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148704211","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

Erratum: Comparative evaluation of green-synthesized FeO, CuO, MnO, ZnO, NiO, and MgO nanoparticles in Fenton and photo-Fenton systems for molasses-based effluent treatment 更正：绿色合成FeO， CuO, MnO, ZnO， NiO和MgO纳米颗粒在Fenton和光Fenton系统中用于糖蜜基废水处理的比较评估

IF 1 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2026-05-11 DOI: 10.1007/s40042-026-01652-2

Mueed Akhtar, Farrukh Naeem, Parveen Akhter, Nadeem Tariq, Shaista Javaid, Murid Hussain

引用次数: 0

Beam commissioning of the RAON injector and low-energy superconducting linac SCL3 RAON注入器和低能超导直线加速器SCL3的束流调试

IF 1 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2026-05-11 DOI: 10.1007/s40042-026-01653-1

Ji-Ho Jang, Dong-O Jeon, Hyung Jin Kim, Jeongil Heo, Bum Sik Park, Jang Won Kwon, Yujung Ahn, Chul Jin Choi, Eunhun Im, Sangyoon Bae, Kyung Tae Seol, Ki Taek Son, Do Yoon Lee, In Seok Hong, Yoochul Jung, Youngkwon Kim, Hyojae Jang, Heetae Kim, Juwan Kim, Joonsun Kang, Hyung Joo Son, Chang Seok Seo, Yeon Sei Chung, Hyunchang Jin, Sukho Moon

{"title":"Beam commissioning of the RAON injector and low-energy superconducting linac SCL3","authors":"Ji-Ho Jang, Dong-O Jeon, Hyung Jin Kim, Jeongil Heo, Bum Sik Park, Jang Won Kwon, Yujung Ahn, Chul Jin Choi, Eunhun Im, Sangyoon Bae, Kyung Tae Seol, Ki Taek Son, Do Yoon Lee, In Seok Hong, Yoochul Jung, Youngkwon Kim, Hyojae Jang, Heetae Kim, Juwan Kim, Joonsun Kang, Hyung Joo Son, Chang Seok Seo, Yeon Sei Chung, Hyunchang Jin, Sukho Moon","doi":"10.1007/s40042-026-01653-1","DOIUrl":"10.1007/s40042-026-01653-1","url":null,"abstract":"<div>Beam commissioning of the RAON linac has been carried out with various ion species in the injector and with 40Ar9+ and 40Ar8+ beams in the low-energy superconducting linac SCL3. This paper primarily reports the results obtained with 40Ar8+ beams, while data from other ion species are included when needed. A beam-tuning procedure for the LEBT based on Allison scanner data was established, enabling proper beam matching at the RFQ entrance. In the MEBT, transverse beam parameters were refined through wire-scanner measurements. During SCL3 beam commissioning, cavity settings obtained from phase scans yielded beam energies consistent with TRACK predictions and were confirmed by TOF measurements. The SCL3 transmission was lower than expected, indicating that further study is required to clarify and mitigate the beam-loss mechanisms, including possible limitations in the longitudinal acceptance.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"89 on","pages":"536 - 550"},"PeriodicalIF":1.0,"publicationDate":"2026-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148807316","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

Erratum: Structure and transport properties of indium selenide thin films grown by sputtering: effect of post-deposition annealing 注：溅射生长硒化铟薄膜的结构和输运特性：沉积后退火的影响

IF 1 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2026-05-08 DOI: 10.1007/s40042-026-01651-3

Minh-Anh Nguyen Tran, Viet Huong Nguyen, Dinh Tam Phuong, Hung-Anh Tran Vu, Nguyen Dinh Nam, The Long Nguyen, Anh Tuan Duong

引用次数: 0

Structure of pitch-pattern motifs in Major League Baseball 美国职业棒球大联盟中投球图案图案的结构

IF 1 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2026-05-08 DOI: 10.1007/s40042-026-01641-5

Youngjai Park, Chaewoon Lim, Seung-Woo Son, Mi Jin Lee

{"title":"Structure of pitch-pattern motifs in Major League Baseball","authors":"Youngjai Park, Chaewoon Lim, Seung-Woo Son, Mi Jin Lee","doi":"10.1007/s40042-026-01641-5","DOIUrl":"10.1007/s40042-026-01641-5","url":null,"abstract":"<div>Baseball consists of two teams alternating between batting and fielding while competing to score runs through sequential pitching events. Recent advances in tracking technology have enabled all Major League Baseball (MLB) clubs to record every pitch with high resolution, yet most quantitative studies have primarily emphasized single-pitch metrics, leaving the role of sequential structure less explored. Here, we examine pitch-pattern motifs of multiple lengths using approximately 12.4 million Statcast pitch recordings from the 2008 to 2025 MLB regular seasons at two complementary scales. At the macroscale, we quantify pitch-sequence diversity using the Shannon entropy and inverse Simpson index and examine their relationships with earned run average and wins. At the microscale, we compare hit and out frequencies across pitch-pattern motifs. Rather than identifying outcome-determining sequences, we find that motif usage exhibits stable, non-random organization, as reflected in Zipf’s and Heaps’ laws, while showing limited association with conventional performance measures. While language-like scaling (Zipf’s and Heaps’ laws) clearly reveals an underlying ‘grammar’ of MLB pitch sequences, that grammar alone is insufficient to account for performance indicators such as earned run average or wins. These results suggest that sequence-based analyses clarify the structural organization of pitch usage, while also delineating the limits of motif-based approaches for explaining performance without richer contextual information.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"89 4","pages":"433 - 445"},"PeriodicalIF":1.0,"publicationDate":"2026-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148704196","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

Exploration of triboelectric mechanism in ferroelectric polymers via non-contact measurements 通过非接触测量探索铁电聚合物的摩擦电机制

IF 1 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2026-05-08 DOI: 10.1007/s40042-026-01655-z

Jae Hyeon Jeon, Ying Chieh Hu, Jong Yeon Kim, Min Su Yeo, Su Min Lee, Joo Hyeong Lee, Ju Won Jeong, Dong Geun Jeong, Jong Hun Kim, Jong Hoon Jung

{"title":"Exploration of triboelectric mechanism in ferroelectric polymers via non-contact measurements","authors":"Jae Hyeon Jeon, Ying Chieh Hu, Jong Yeon Kim, Min Su Yeo, Su Min Lee, Joo Hyeong Lee, Ju Won Jeong, Dong Geun Jeong, Jong Hun Kim, Jong Hoon Jung","doi":"10.1007/s40042-026-01655-z","DOIUrl":"10.1007/s40042-026-01655-z","url":null,"abstract":"<div>Although enhanced triboelectric output has been reported in ferroelectric polymers, the underlying mechanism remains unclear. Remnant polarization and piezoelectricity in poled ferroelectric polymers can be coupled with triboelectrification and electrostatic induction during physical contact. Here, we investigate the dominant mechanism responsible for the large triboelectric output of the ferroelectric polymer polyvinylidene fluoride (PVDF) through sequential non-contact, contact, and non-contact measurements. A systematic investigation of the charge outputs of unpoled, up-poled, and down-poled PVDF films, which exhibit very similar surface roughness and dielectric constants, reveals that the triboelectric charge outputs are strongly dependent on the relative polarization difference. It is greatest for contact between up-poled PVDF and down-poled PVDF, whereas it is smallest for contact between unpoled PVDF and unpoled PVDF. These results indicate that the surface potential difference, associated with the mutual energy level difference between the two surfaces, can be tuned by the remnant-polarization-induced electric field and plays a dominant role in governing the triboelectric output in ferroelectric polymers.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"89 4","pages":"392 - 399"},"PeriodicalIF":1.0,"publicationDate":"2026-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148704209","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

Energy–momentum tensor from diffeomorphism invariance in classical electrodynamics 经典电动力学中微分同胚不变性的能量动量张量

IF 1 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2026-05-08 DOI: 10.1007/s40042-026-01654-0

Taeseung Choi

{"title":"Energy–momentum tensor from diffeomorphism invariance in classical electrodynamics","authors":"Taeseung Choi","doi":"10.1007/s40042-026-01654-0","DOIUrl":"10.1007/s40042-026-01654-0","url":null,"abstract":"<div>We reexamine the energy–momentum tensor in classical electrodynamics from the perspective of spacetime-dependent translations, i.e., diffeomorphism invariance in flat spacetime. When energy–momentum is identified through local translations rather than constant ones, a unique, symmetric, and gage-invariant energy–momentum tensor emerges that satisfies a genuine off-shell Noether identity without invoking the equations of motion. For the free electromagnetic field, this tensor coincides with the familiar Belinfante–Rosenfeld and Bessel–Hagen expressions, but arises here directly from spacetime-dependent translation symmetry rather than from improvement procedures or compensating gage transformations. In interacting classical electrodynamics, comprising a point charge coupled to the electromagnetic field, diffeomorphism invariance yields well-defined energy–momentum tensors for the field and the particle, while the interaction term itself generates no independent local energy–momentum tensor. Its role is instead entirely encoded in the coupled equations of motion governing energy–momentum exchange, thereby resolving ambiguities in the local definition of the energy–momentum tensor present in canonical and improvement-based approaches.</div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"89 4","pages":"335 - 343"},"PeriodicalIF":1.0,"publicationDate":"2026-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148704214","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