Journal of the Korean Physical Society最新文献_第5页

Bionic modeling and neurocomputing of synaptic transistor based on egg white as gate dielectric 基于蛋白作为栅极电介质的突触晶体管的仿生建模和神经计算

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-08-01 DOI: 10.1007/s40042-024-01150-3

Liqiang Guo, Wenlong Li, Qian Dong, Chang Liu, Guanggui Cheng, Yanhua Ding, Jin Wu

{"title":"Bionic modeling and neurocomputing of synaptic transistor based on egg white as gate dielectric","authors":"Liqiang Guo, Wenlong Li, Qian Dong, Chang Liu, Guanggui Cheng, Yanhua Ding, Jin Wu","doi":"10.1007/s40042-024-01150-3","DOIUrl":"10.1007/s40042-024-01150-3","url":null,"abstract":"<div><p>Synaptic transistors are considered to hold great potential as electronic devices for constructing brain-inspired neuromorphic cognitive systems. Synaptic transistors made of degradable and environmentally friendly materials are a common concern among researchers today. Egg whites are rich in sources and contain abundant hydrophilic functional groups, including –NH and –OH groups, which can facilitate the movement of protons. In this paper, a synaptic transistor using egg white as the gate dielectric for biomimetic simulation and neuromorphic computing is prepared. The fabricated synaptic transistor successfully simulates typical biological synaptic behaviors, such as excitatory postsynaptic current and double-pulse facilitation, and effectively models the transition from short-term memory to long-term memory. Furthermore, based on the long-term memory and conductance linearity of egg-white gated synaptic transistors, it completes the neuromorphic computation for handwritten digit recognition in neural networks, indicating that egg-white gated synaptic transistors have great potential for application in “green” neural-form electronic devices.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 6","pages":"503 - 509"},"PeriodicalIF":0.8,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141872242","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

Exploring spontaneous CP violation in an axion model with seesaw mechanism 探索具有跷跷板机制的轴子模型中的自发 CP 违约现象

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-07-31 DOI: 10.1007/s40042-024-01143-2

Y. H. Ahn, Sin Kyu Kang

{"title":"Exploring spontaneous CP violation in an axion model with seesaw mechanism","authors":"Y. H. Ahn, Sin Kyu Kang","doi":"10.1007/s40042-024-01143-2","DOIUrl":"10.1007/s40042-024-01143-2","url":null,"abstract":"<div><p>We investigate an expansion of the Dine-Fischler-Srednicki-Zhitnitsky (DFSZ) model aiming at realizing spontaneous CP violation. By introducing singlet heavy Majorana neutrinos and an additional new singlet scalar, we formulate the Yukawa Lagrangian and scalar potential for the extended model, highlighting their pivotal role in inducing CP violation. This study reveals that CP can spontaneously be broken at the 1-loop level, facilitated by the generation of the quartic couplings in the scalar potential which are imperative for inducing spontaneous CP violation. We discuss the implications of the model on the new axion. By presenting the leptonic Yukawa Lagrangian and the structure of the Dirac neutrino mass matrix within the minimal seesaw framework, we study the interply between the CP-violating phase arising from the extended DFSZ model and the phases of the Pontecorvo–Maki–Nakagawa–Sakata (PMNS) mixing matrix. A brief numerical analysis is conducted to illustrate the compatibility of the extended DFSZ model with observed neutrino oscillation parameters, providing insights into the origin of leptonic CP violation.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 7","pages":"552 - 559"},"PeriodicalIF":0.8,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141873467","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

In-vacuum undulators for the first phase beamlines of Korea-4GSR 用于韩国-4GSR 第一阶段光束线的真空中起泡器

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-07-31 DOI: 10.1007/s40042-024-01133-4

Changwan Ha, Ik Seon Kwon, Ki-Jeong Kim, Jehan Kim, Jae-Hong Lim

{"title":"In-vacuum undulators for the first phase beamlines of Korea-4GSR","authors":"Changwan Ha, Ik Seon Kwon, Ki-Jeong Kim, Jehan Kim, Jae-Hong Lim","doi":"10.1007/s40042-024-01133-4","DOIUrl":"10.1007/s40042-024-01133-4","url":null,"abstract":"<div><p>Korea-4GSR, a new synchrotron radiation facility currently under construction in Ochang, Chungbuk, South Korea, introduces three types of in-vacuum undulators (IVUs) for its first phase hard X-ray beamlines: IVU20, IVU22, and IVU24. These IVU types share a common 3-m-long framework capable of adjusting the magnetic gap size between 5 and 18 mm, but they differ in the undulator period length (<i>λ</i><sub>u</sub>). This study characterizes their photon beams in terms of brightness, spectral coverage, source size, angular divergence, coherent fraction, coherent flux, and total and central cone radiation powers, using undulator calculations. The three IVU types are comparable in brightness. IVU20 is the most coherent, although lacking spectral continuity at around 7.5 keV. IVU22 and IVU24 ensure spectral continuity, but their coherent flux is moderately compromised. The performance of the undulators is assessed in comparison to the Pohang Light Source-II (PLS-II) undulator and the U21 undulator at Advanced Photon Source Upgrade (APS-U).</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 5","pages":"371 - 380"},"PeriodicalIF":0.8,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40042-024-01133-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141872367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Utilize azimuthal correlation to examine the collective flow influence caused by the reaction between (^{84})Kr nuclei and emulsion nuclei at 1 A GeV 利用方位角相关性研究 1 A GeV 下 $$^{84}$ Kr 核与乳状核之间的反应引起的集体流影响

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-07-25 DOI: 10.1007/s40042-024-01146-z

Manoj Kumar Singh, Babita Kumari, Kajal Attri

{"title":"Utilize azimuthal correlation to examine the collective flow influence caused by the reaction between (^{84})Kr nuclei and emulsion nuclei at 1 A GeV","authors":"Manoj Kumar Singh, Babita Kumari, Kajal Attri","doi":"10.1007/s40042-024-01146-z","DOIUrl":"10.1007/s40042-024-01146-z","url":null,"abstract":"<div><p>The expansion and decay of excited and compressed nuclear matter produced in heavy-ion collisions across a broad range of incident energies are largely dependent on collective flow. Hydrodynamic theories suggest that the fluid-like behavior of nuclear matter produces a substantial azimuthal correlation in the particle emission. The greatest opportunity to discover nuclear matter compressibility and, indirectly, the nuclear equation of state is through precise measurements of collective flow. The collective flow of projectile fragments (PFs) of charge <span>(Zge 2)</span> produced in <span>(^{84})</span>Kr in interacts with emulsion (composite target) and Ag(Br) target at 1 A GeV for <span>(N_{text {PF}}ge 3)</span> and <span>(N_{alpha }ge 3)</span> has been evaluated using azimuthal correlation functions. The collective flow is observed to be the most pronounced in semi-central collisions. The amplitude of the collective flow appears to be pretty stable at relativistic energy, according to our observation. Additionally, the obtained outcomes are compared to other existing experimental data.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 7","pages":"560 - 565"},"PeriodicalIF":0.8,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141776954","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

Macrocrack propagation with grain growth on transient heat loaded tungsten 瞬态热负荷钨上伴随晶粒生长的宏观裂纹扩展

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-07-25 DOI: 10.1007/s40042-024-01139-y

Ki-Baek Roh, Myeong-Geon Lee, Kyung-Min Kim, Gon-Ho Kim

{"title":"Macrocrack propagation with grain growth on transient heat loaded tungsten","authors":"Ki-Baek Roh, Myeong-Geon Lee, Kyung-Min Kim, Gon-Ho Kim","doi":"10.1007/s40042-024-01139-y","DOIUrl":"10.1007/s40042-024-01139-y","url":null,"abstract":"<div><p>The propagation of microcrack and grain growth in tungsten occurred at condition of transient heat loads was investigated experimentally, observing the effect on macrocrack development induced by stress intensification in time order. The temperature variation in short time, with frequency 30 Hz, heat flux 0.1 GWm<sup>−2</sup>, duration 2 ms at base temperature 1150 °C, induces fatigue fracture on the surface of tungsten, resulting in the formation of microcrack. Since the effective spatial temperature variation is limited to a few micron, microcrack is also occurred at the comparable depth. Following the initiation of microcrack, the grain growth propagation depth over time is measured and calculated based on the grain growth model with measuring the associated constants of the model. Within the grain growth layer, the degraded material properties at the microcrack tip lead to stress intensification which ultimately develop into macrocrack with order of millimeters. The study investigates that the subsurface microstructural changes in tungsten, caused by transient heat loads, have the potential to develop into macrocrack that extend into the deeper bulk area.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 4","pages":"305 - 314"},"PeriodicalIF":0.8,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141776955","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

Beam dynamics simulations at the high energy accelerator section in the RAON accelerator RAON 加速器高能加速器部分的光束动力学模拟

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-07-25 DOI: 10.1007/s40042-024-01145-0

Hyunchang Jin, Hyojae Jang, Ji-Ho Jang, Dong-O Jeon

引用次数: 0

Enhanced figure of merit of polycrystalline PtSe2/PtSe2 structures at room temperature by a facile wet-transfer stacking method 通过简便的湿转移堆叠法提高室温下多晶 PtSe2/PtSe2 结构的优越性能

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-07-25 DOI: 10.1007/s40042-024-01147-y

Jung-Min Cho, Yun-Ho Kim, Won-Yong Lee, Jae Won Choi, No-Won Park, Sree Sourav Das, Mona Zebarjadi, Gil-Sung Kim, Sang-Kwon Lee

{"title":"Enhanced figure of merit of polycrystalline PtSe2/PtSe2 structures at room temperature by a facile wet-transfer stacking method","authors":"Jung-Min Cho, Yun-Ho Kim, Won-Yong Lee, Jae Won Choi, No-Won Park, Sree Sourav Das, Mona Zebarjadi, Gil-Sung Kim, Sang-Kwon Lee","doi":"10.1007/s40042-024-01147-y","DOIUrl":"10.1007/s40042-024-01147-y","url":null,"abstract":"<div><p>We report a promising strategy to enhance the in-plane thermoelectric (TE) figure of merit (ZT) of few-layer semimetallic PtSe<sub>2</sub> films at 300 K by piling up PtSe<sub>2</sub> layers with the same thickness (3 nm) as stacked PtSe<sub>2</sub>/PtSe<sub>2</sub> (3-nm/3-nm) homostructures by a wet-transfer method. We observed that the Seebeck coefficient was enhanced meaningfully upon increasing the number of stacked layers and exceeded ~ 173.2 μV/K with a relatively constant electrical conductivity of ~ 18.4 S/cm at 300 K. By contrast, as the number of layers increased, thermal conductivity also showed a significant reduction, and ultimately, the ZT factor increased by ~ 380% compared to the single-stacked PtSe<sub>2</sub> structure. Such an increase in the ZT factor shows the possibility of a considerable improvement in the TE properties of semimetallic PtSe<sub>2</sub> with a new technique called facile wet-transfer stacking. The proposed method is expected to play a very important role in future microscopic cooling and energy-generating TE device applications.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 8","pages":"643 - 649"},"PeriodicalIF":0.8,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141776952","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

Effects of symmetry energy on the equation of state for hybrid neutron stars 对称能对混合中子星状态方程的影响

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-07-25 DOI: 10.1007/s40042-024-01148-x

Parada T. P. Hutauruk, Hana Gil, Seung-il Nam, Chang Ho Hyun

{"title":"Effects of symmetry energy on the equation of state for hybrid neutron stars","authors":"Parada T. P. Hutauruk, Hana Gil, Seung-il Nam, Chang Ho Hyun","doi":"10.1007/s40042-024-01148-x","DOIUrl":"10.1007/s40042-024-01148-x","url":null,"abstract":"<div><p>In this study, we explore the impact of symmetry energy on the transitions between hadron and quark phases within compact stars. We investigate the properties of potential configurations of quark-hadron hybrid stars using energy-density functional (EDF) models and the flavor SU(2) Nambu–Jona-Lasinio (NJL) model, employing Schwinger’s covariant proper-time regularization scheme. In this theoretical framework, we utilize equations of state (EoSs) of hadronic matter obtained from EDF models to describe the hadronic phase, and the flavor SU(2) NJL model with varying repulsive-vector interaction strengths represents the quark phase. By solving the Tolman–Oppenheimer–Volkoff equation, we examine the mass-radius properties of the hybrid star configurations for different vector interactions and nuclear symmetry energies. Our findings show that the critical density at which the phase transition occurs ranges from 3.6 to 6.7 times the normal nuclear-matter density, depending on the symmetry energy and the strength of the vector coupling (<span>(G_v)</span>). The value of <span>(G_v)</span> influences the maximum mass of the neutron star (NS). In the absence of a repulsive force, the maximum mass of the NS is only about 1.5 times the mass of the Sun (<span>(M_odot)</span>). Still, it exceeds 2.0<span>(M_odot)</span> when the vector coupling constant is approximately half of the attractive scalar coupling constant. Interestingly, quark matter does not impact the canonical mass of NS (1.4<span>(M_odot)</span>). Therefore, observing the canonical mass of NSs can provide valuable constraints on the EoS of hadronic matter at high densities.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 8","pages":"617 - 627"},"PeriodicalIF":0.8,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141776950","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

Inter-layer coupling strength in lipid bilayer can control the size of lipid domains 脂质双分子层的层间耦合强度可控制脂质结构域的大小

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-07-25 DOI: 10.1007/s40042-024-01144-1

Kan Sornbundit

引用次数: 0

Suppression of external noise in on-chip photon-pair sources 抑制片上光子对源的外部噪声

IF 0.8 4区物理与天体物理

Journal of the Korean Physical Society Pub Date : 2024-07-24 DOI: 10.1007/s40042-024-01141-4

Woncheol Shin, Kiwon Kwon, Dongjin Lee, Heedeuk Shin

{"title":"Suppression of external noise in on-chip photon-pair sources","authors":"Woncheol Shin, Kiwon Kwon, Dongjin Lee, Heedeuk Shin","doi":"10.1007/s40042-024-01141-4","DOIUrl":"10.1007/s40042-024-01141-4","url":null,"abstract":"<div><p>Quantum photonic integrated circuits are ideal for photon-based complex quantum information systems due to their size, stability, and scalability. Photon-pair sources integrated into these circuits help reduce connection losses. These pairs are generated by pumping strong light through optical fibers into the chip, which can introduce unwanted noise photons, lowering the performance of quantum sources. Here, we studied photon pairs generated solely from on-chip sources to improve quantum photonic applications. External filtering often fails due to environmental influences, leading us to propose on-chip filters before and after photon-pair generation to mitigate external noise. We fabricated silicon waveguides with and without on-chip asymmetric Mach–Zehnder interferometer filters and analyzed photon pair properties through experiments. The results showed that on-chip filters effectively eliminate external noise, tripling the coincidence-to-accidental coincidence ratio. This suggests that on-chip filtering holds significant promise for enhancing quantum photonic applications like quantum communications and computations.</p></div>","PeriodicalId":677,"journal":{"name":"Journal of the Korean Physical Society","volume":"85 6","pages":"476 - 481"},"PeriodicalIF":0.8,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141776953","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