Physics of Plasmas最新文献_第4页

Interaction mechanism of cold atmospheric plasmas and fusion peptides of spike protein in SARS-CoV-2 revealed by reactive molecular dynamics simulation 反应分子动力学模拟揭示冷大气等离子体与 SARS-CoV-2 中尖峰蛋白融合肽的相互作用机制

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-09-03 DOI: 10.1063/5.0216072

Yang Chen, Zhao-Nan Chai, Yuan-Tao Zhang

{"title":"Interaction mechanism of cold atmospheric plasmas and fusion peptides of spike protein in SARS-CoV-2 revealed by reactive molecular dynamics simulation","authors":"Yang Chen, Zhao-Nan Chai, Yuan-Tao Zhang","doi":"10.1063/5.0216072","DOIUrl":"https://doi.org/10.1063/5.0216072","url":null,"abstract":"Despite the conclusion of the COVID-19 pandemic, the coronavirus-killing ability of cold atmospheric plasma (CAP) remains impressive, and investigations into its underlying mechanisms are still ongoing. The fusion peptide (FP) is a crucial site of membrane fusion and toxicity exerted by the S-protein in severe acute respiratory syndrome CoV-2 (SARS-CoV-2). In this study, reactive molecular dynamics simulations were performed to investigate the interaction mechanisms of FP and reactive oxygen species (ROS). The simulation results show that the given ROS (O atoms and OH radicals as examples) can destroy hydrophobic residues, negatively charged acidic residues, and peptide bonds through structurally altering essential sites. Furthermore, the reaction typically initiates from the H-abstraction reaction, followed by various types of oxidative modifications such as dehydrogenation, hydroxylation, carbonylation, cyclogenesis, ring cleavage, and decarboxylation, which are consistent with the experimental findings made on peptides. Therefore, it can be predicted that the membrane fusion ability of FP and the toxicity of SARS-CoV-2 will be reduced, with CAP functioning as a bactericidal disinfectant. The dose effects were also investigated, providing experimental guidance for the optimization of CAP. In this study, the interaction processes of FP and CAP are explored by revealing the chemical pathways and final reaction products from the computational data, thus providing a fundamental understanding of the mechanisms for inactivating SARS-CoV-2 by CAP.","PeriodicalId":20175,"journal":{"name":"Physics of Plasmas","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Steady state stability features of the electron–positron plasma diode in a mode with particle reflection from potential extrema 电子-正电子等离子体二极管在粒子从极值电位反射模式下的稳态稳定性特征

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-09-03 DOI: 10.1063/5.0225861

L. A. Bakaleinikov, V. I. Kuznetsov, E. Yu. Flegontova, D. P. Barsukov, I. K. Morozov

引用次数: 0

Dust–ion–acoustic damped solitary waves and shocks in laboratory and Saturn's E-ring magnetized nonthermal dusty plasmas with anisotropic ion pressure and dust-charge fluctuation 具有各向异性离子压力和尘埃电荷波动的实验室和土星 E 环磁化非热尘埃等离子体中的尘埃-离子-声阻尼孤波和冲击

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-09-03 DOI: 10.1063/5.0220030

Num Prasad Acharya, Suresh Basnet, Amar P. Misra, Raju Khanal

{"title":"Dust–ion–acoustic damped solitary waves and shocks in laboratory and Saturn's E-ring magnetized nonthermal dusty plasmas with anisotropic ion pressure and dust-charge fluctuation","authors":"Num Prasad Acharya, Suresh Basnet, Amar P. Misra, Raju Khanal","doi":"10.1063/5.0220030","DOIUrl":"https://doi.org/10.1063/5.0220030","url":null,"abstract":"We study the oblique propagation of weakly nonlinear dust–ion–acoustic (DIA) solitary waves (SWs) and shocks in collisional magnetized nonthermal dusty plasmas that are relevant in laboratory and space (Saturn's E-ring) environments. We consider plasmas to be composed of q-nonextensive hot electrons, thermal positive ions, and immobile negatively charged dust grains immersed in a static magnetic field and take into account the effects of ion creation (source), ion loss (sink), ion–neutral and ion–dust collisions, anisotropic ion pressure, and dust-charge fluctuations on the evolution of small-amplitude SWs and shocks. The ion–neutral collision enhancement equilibrium dust-charge number is self-consistently determined using Newton–Raphson method. We found that in laboratory dusty plasmas with adiabatic dust-charge variation [i.e., when the dust charging frequency (νch) is much higher than the dust–plasma oscillation frequency (ωpd)], the DIA solitary waves (DIASWs) get damped by the effects of the ion–dust and ion–neutral collisions, whereas the ion creation and ion loss lead to the amplification of solitary waves, and they appear as only compressive types with positive potential. On the other hand, in Saturn's E-ring plasmas, where the collisional and ion creation or ion loss effects are insignificant, the non-adiabaticity of dust-charge variation can give rise to the evolution of either damped DIASWs or DIA shocks, depending on the smallness of the ratios νch/ωpd or ωpd/νch, respectively. Furthermore, two critical values of the nonextensive parameter q exist, below (or above) which, the DIASWs and shocks can appear as rarefactive (or compressive) types. The characteristics of DIASWs and shocks are also analyzed numerically for parameters relevant to the laboratory and Saturn's E-ring plasmas.","PeriodicalId":20175,"journal":{"name":"Physics of Plasmas","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Hall MHD waves: A fundamental departure from their MHD counterparts 霍尔 MHD 波：与 MHD 对应波的根本区别

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-09-03 DOI: 10.1063/5.0227375

Swadesh M. Mahajan, Prerana Sharma, Manasvi Lingam

引用次数: 0

Effect of radiofrequency bias power on transmission spectrum of flat-cutoff sensor in inductively coupled plasma 射频偏置功率对电感耦合等离子体中平截传感器传输谱的影响

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-09-03 DOI: 10.1063/5.0221016

Hee-Jung Yeom, Gwang-Seok Chae, Min Young Yoon, Wooram Kim, Jae-Heon Lee, Jun-Hyung Park, Chan-Woo Park, Jung-Hyung Kim, Hyo-Chang Lee

{"title":"Effect of radiofrequency bias power on transmission spectrum of flat-cutoff sensor in inductively coupled plasma","authors":"Hee-Jung Yeom, Gwang-Seok Chae, Min Young Yoon, Wooram Kim, Jae-Heon Lee, Jun-Hyung Park, Chan-Woo Park, Jung-Hyung Kim, Hyo-Chang Lee","doi":"10.1063/5.0221016","DOIUrl":"https://doi.org/10.1063/5.0221016","url":null,"abstract":"Real-time monitoring of plasma parameters at the wafer plane is important because it significantly affects the processing results, yield enhancement, and device integrity of plasma processing. Various plasma diagnostic sensors, including those embedded in a chamber wall and on-wafer sensors, such as flat-cutoff sensors, have been developed for plasma measurements. However, to measure the plasma density on the wafer surface in real-time when processing plasma with bias power, such as in the semiconductor etching process, one must analyze the transmission spectrum of the flat-cutoff sensor in an environment with bias power applied. In this study, the transmission-spectrum and measured plasma-density characteristics of an electrode-embedded flat-cutoff sensor are analyzed via electromagnetic simulations and experiments under applied bias power. Our findings indicate that the flat-cutoff sensor accurately measures the plasma density, which is equivalent to the input plasma density under low bias power. Conversely, under high bias power, the plasma density measured by the sensor is lower than the input plasma density. Also, a thick-sheath layer is formed owing to the high bias power, which may complicate the measurement of plasma parameters using the flat-cutoff sensor. Plasma diagnostics using a flat-cutoff sensor in thick-sheath environments can be achieved by optimizing the flat-cutoff sensor structure. Our findings can enhance the analysis of plasma parameters on-wafer surfaces in processing environments with bias power applied.","PeriodicalId":20175,"journal":{"name":"Physics of Plasmas","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Conceptual research on meeting tomographic reconstruction and measurement accuracy requirements: Key factors in the development of a radiated power diagnostics for DEMO 关于满足断层重构和测量精度要求的概念研究：为 DEMO 开发辐射功率诊断的关键因素

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-30 DOI: 10.1063/5.0209330

M. Chernyshova, K. Malinowski, K. Mikszuta-Michalik, S. Jabłoński, M. Jagielski

{"title":"Conceptual research on meeting tomographic reconstruction and measurement accuracy requirements: Key factors in the development of a radiated power diagnostics for DEMO","authors":"M. Chernyshova, K. Malinowski, K. Mikszuta-Michalik, S. Jabłoński, M. Jagielski","doi":"10.1063/5.0209330","DOIUrl":"https://doi.org/10.1063/5.0209330","url":null,"abstract":"This work addresses the development of diagnostics for core plasma radiated power and soft x-ray intensity measurements, which will be useful in future fusion reactors to ensure reliable plasma control (by monitoring the power loss across the separatrix) in accordance with the DEMO control requirements. For this purpose, we look into the development of such a detection system that will provide the required information via soft x-ray diagnostics. The target photon range for such a detecting system is considered to be 3–50 keV. The aspects of the development have included detailed diagnostics design, physics, engineering and integration studies, as well as an investigation into the feasibility and performance of the diagnostics and its components. The development is currently in the design phase. Nevertheless, the answer is already needed regarding the fulfillment of system requirements. In order to monitor the power crossing the separatrix, a precise estimation of the plasma radiation is needed to maintain the high-efficiency plasma. This requires strict measurement accuracy criteria, with 3% accuracy margin for the core plasma radiated power estimate and 5% noise for a single measurement of a single detector within the detector array. Here, an initial estimation of the detecting system's accuracy was provided based on an analysis of both the tomography reconstruction and detector measurement capabilities. The optimal number of lines of sight for tomography reconstruction was found for the considered plasma field of view. Additionally, the initial concept for a photon-sensitive chamber of the detecting system was developed. This allowed for the assessment of the predicted measurement accuracy of the detector for horizontal and vertical lines of sight.","PeriodicalId":20175,"journal":{"name":"Physics of Plasmas","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Three-dimensional plasmoid-mediated reconnection and turbulence in Hall magnetohydrodynamics 霍尔磁流体力学中的三维等离子体介导的重联和湍流

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-30 DOI: 10.1063/5.0216561

Yi-Min Huang, Amitava Bhattacharjee

{"title":"Three-dimensional plasmoid-mediated reconnection and turbulence in Hall magnetohydrodynamics","authors":"Yi-Min Huang, Amitava Bhattacharjee","doi":"10.1063/5.0216561","DOIUrl":"https://doi.org/10.1063/5.0216561","url":null,"abstract":"Plasmoid instability accelerates reconnection in collisional plasmas by transforming a laminar reconnection layer into numerous plasmoids connected by secondary current sheets in two dimensions (2D) and by fostering self-generated turbulent reconnection in three dimensions (3D). In large-scale astrophysical and space systems, plasmoid instability likely initiates in the collisional regime but may transition into the collisionless regime as the fragmentation of the current sheet progresses toward kinetic scales. Hall magnetohydrodynamics (MHD) models are widely regarded as a simplified yet effective representation of the transition from collisional to collisionless reconnection. However, plasmoid instability in 2D Hall MHD simulations often leads to a single-X-line reconnection configuration, which significantly differs from fully kinetic particle-in-cell simulation results. This study shows that single-X-line reconnection is less likely to occur in 3D compared to 2D. Moreover, depending on the Lundquist number and the ratio between the system size and the kinetic scale, Hall MHD can also realize 3D self-generated turbulent reconnection. We analyze the features of the self-generated turbulent state, including the energy power spectra and the scale dependence of turbulent eddy anisotropy.","PeriodicalId":20175,"journal":{"name":"Physics of Plasmas","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Rayleigh–Taylor turbulence in strongly coupled dusty plasmas 强耦合尘埃等离子体中的雷利-泰勒湍流

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-28 DOI: 10.1063/5.0216032

Rauoof Wani, Mahendra Verma, Sanat Tiwari

引用次数: 0

Electron tail suppression and effective collisionality due to synchrotron emission and absorption in mildly relativistic plasmas 轻度相对论等离子体中同步辐射和吸收导致的电子尾抑制和有效碰撞性

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-28 DOI: 10.1063/5.0228464

Ian E. Ochs, Mikhail E. Mlodik, Nathaniel J. Fisch

引用次数: 0

Causal analysis among azimuthal Fourier modes in linear plasma based on multivariate time series models 基于多元时间序列模型的线性等离子体方位傅立叶模式之间的因果分析

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-28 DOI: 10.1063/5.0223028

F. Miwakeichi, M. Sasaki

引用次数: 0