IF 6.7 2区物理与天体物理

Quantum Science and Technology Pub Date : 2024-11-13 DOI: 10.1088/2058-9565/ad895b

David Danin and Felix Tennie

引用次数: 0

Venusian ion escape under extreme conditions: A dynamic pressure and temperature simulation study 极端条件下的金星离子逃逸：动态压力和温度模拟研究

IF 6.5 2区物理与天体物理

Astronomy & Astrophysics Pub Date : 2024-11-13 DOI: 10.1051/0004-6361/202449326

M. C. Katrougkalou, M. Persson, S. Aizawa, N. André, R. Modolo, E. Jariel, A. Kullen, T. Karlsson

{"title":"Venusian ion escape under extreme conditions: A dynamic pressure and temperature simulation study","authors":"M. C. Katrougkalou, M. Persson, S. Aizawa, N. André, R. Modolo, E. Jariel, A. Kullen, T. Karlsson","doi":"10.1051/0004-6361/202449326","DOIUrl":"https://doi.org/10.1051/0004-6361/202449326","url":null,"abstract":"Context. We investigated the response of the Venusian atmospheric ion escape under the effect of interplanetary coronal mass ejections (ICMEs) using the Latmos Hybrid Simulation (LatHyS).Aims. In particular, we focused on the influence of extreme ICME dynamic pressures and temperatures, with the temperature being a parameter that has not been extensively studied in the past.Methods. Simulations were performed for two different dynamic pressures and three different temperatures. For the case of the dynamic pressure simulations, a density and a velocity enhancement event were studied separately. The H+ and O+ ion escape was then examined and compared for different escape channels.Results. In both dynamic pressure enhancement cases, we find that there is no clear dependence of the O+ ion escape on the dynamic pressure, which is consistent with observations. On the other hand, the temperature of the incoming solar wind positively influences the H+ and O+ ion escape. This is attributed in part to the enhanced gyroradius of the particles, which allows them to penetrate deeper into the planet’s atmosphere.","PeriodicalId":8571,"journal":{"name":"Astronomy & Astrophysics","volume":null,"pages":null},"PeriodicalIF":6.5,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142610362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

A Tale of NGC 3785: The formation of an ultra-diffuse galaxy at the end of the longest tidal tail NGC 3785的故事：在最长潮汐尾端形成的超漫射星系

IF 6.5 2区物理与天体物理

Astronomy & Astrophysics Pub Date : 2024-11-13 DOI: 10.1051/0004-6361/202452002

Chandan Watts, Sudhanshu Barway, Omkar Bait, Yogesh Wadadekar

引用次数: 0

Evaluation of degradation phenomena in the electric potential distribution inside organic light-emitting diodes by electron holography 利用电子全息技术评估有机发光二极管内部电动势分布的退化现象

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2024-11-13 DOI: 10.1063/5.0234923

Yusei Sasaki, Satoshi Anada, Noriyuki Yoshimoto, Kazuo Yamamoto

{"title":"Evaluation of degradation phenomena in the electric potential distribution inside organic light-emitting diodes by electron holography","authors":"Yusei Sasaki, Satoshi Anada, Noriyuki Yoshimoto, Kazuo Yamamoto","doi":"10.1063/5.0234923","DOIUrl":"https://doi.org/10.1063/5.0234923","url":null,"abstract":"Understanding the intrinsic degradation processes of organic light-emitting diodes is necessary to improve their lifetimes. This intrinsic degradation is typically caused by carrier injection at the interface between the hole transport layer (HTL) and the emissive layer (EML). However, revealing the charge behavior in this local region with a high spatial resolution remains challenging. Thus, this study employed electron holography, a transmission electron microscopy (TEM) technique, to measure the nanometer scale potential distribution inside an OLED composed of N,N′-di-[(1-naphthyl)-N,N′-diphenyl]-(1,1′-biphenyl)-4,4′-diamine (α-NPD) and tris-(8-hydroxyquinoline)aluminum (Alq3) that was degraded via continuous voltage application. The α-NPD and Alq3 functioned as the HTL and EML, respectively. The degraded OLED was found to exhibit several potential distributions, depending on the local positions from which the TEM samples were lifted out of the same bulk sample. The distributions included (i) formation of a potential valley at the α-NPD/Alq3 interface, (ii) disappearance of electric fields within the organic layers, and (iii) similar distribution to original before degradation. We suggest that the degradation was caused by charge accumulation, cationization of Alq3, and local failures. Thus, this study revealed the influence of electric degradation at the nanometer scale because of charge injection to the α-NPD/Alq3 interface. Electron holographic degradation analysis near the HTL/EML interface is expected to aid in the development of design guidelines for preventing device degradation and thus extend device lifetime.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":null,"pages":null},"PeriodicalIF":4.0,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142609897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Suppressed gate leakage and enlarged gate over-drive window of E-mode p-GaN gate double channel HEMTs 抑制 E 模式 p-GaN 栅极双通道 HEMT 的栅极漏电并扩大栅极过驱动窗口

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2024-11-13 DOI: 10.1063/5.0233528

Hang Liao, Zheyang Zheng, Li Zhang, Tao Chen, Yan Cheng, Kevin J. Chen

引用次数: 0

Hot carrier solar cells by adiabatic cooling 绝热冷却热载流子太阳能电池

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2024-11-13 DOI: 10.1063/5.0234167

Tom Markvart

引用次数: 0

Nebular dust attenuation with the Balmer and Paschen lines based on the MaNGA survey 基于 MaNGA 勘测的巴尔默线和帕申线的星云尘埃衰减

IF 6.5 2区物理与天体物理

Astronomy & Astrophysics Pub Date : 2024-11-13 DOI: 10.1051/0004-6361/202451339

Zesen Lin, Renbin Yan

{"title":"Nebular dust attenuation with the Balmer and Paschen lines based on the MaNGA survey","authors":"Zesen Lin, Renbin Yan","doi":"10.1051/0004-6361/202451339","DOIUrl":"https://doi.org/10.1051/0004-6361/202451339","url":null,"abstract":"Dust attenuations observed by stars and ionized gas are not necessarily the same. The lack of observational constraints on the nebular dust attenuation curve leaves a large uncertainty when correcting nebular dust attenuation with stellar continuum-based attenuation curves. Making use of the DAP catalogs of the MaNGA survey, we investigate the nebular dust attenuation of H II regions traced by the Balmer and Paschen lines. Based on a simple simulation, we find that star-forming regions on kpc scales favor the classic foreground screen dust model rather than the uniform mixture model. We propose a novel approach to fit the dust attenuation curve using the emission-line fluxes directly. For strong hydrogen recombination lines (e.g., Hγ, Hδ, and Hϵ), the slopes of the nebular attenuation curve can be well determined and are found to be in good agreement with the Fitzpatrick Milky Way extinction curve with an accuracy of ≲4% in terms of the correction factor. However, severe contaminations and/or systematic uncertainties prevent us from obtaining reasonable values of the slopes for weak recombination lines (e.g., the high-order Balmer lines or the Paschen lines). We discuss how the choice of emission line measurement methods affects the results. Our results demonstrate the difficulty of deriving an average nebular dust attenuation curve given the current ground-based emission-line measurements.","PeriodicalId":8571,"journal":{"name":"Astronomy & Astrophysics","volume":null,"pages":null},"PeriodicalIF":6.5,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142610352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Dynamically Switchable Mid-Infrared Perfect Absorber Based on Grating-Assisted Graphene Plasmon Excitation 基于光栅辅助石墨烯等离子体激发的动态可切换中红外完美吸收器

IF 7 1区物理与天体物理

ACS Photonics Pub Date : 2024-11-13 DOI: 10.1021/acsphotonics.4c01689

Min-Suk Kwon, Jihoon Seo, Yonghan Kim

引用次数: 0

Classical characters of spinor fields in torsion gravity 扭转引力中旋子场的经典特性

IF 3.5 3区物理与天体物理

Classical and Quantum Gravity Pub Date : 2024-11-13 DOI: 10.1088/1361-6382/ad8d9e

Luca Fabbri

引用次数: 0

Pt/β-Ga2O3 Schottky devices enabling 60 Hz half-wave rectification for power-efficient pixel display 实现 60 赫兹半波整流的 Pt/β-Ga2O3 肖特基器件，用于高能效像素显示器