AIP Advances最新文献_第2页

Leakage current in GaN-on-GaN vertical GaN SBDs grown by HVPE on native GaN substrates 在原生氮化镓衬底上通过 HVPE 生长的氮化镓基垂直氮化镓 SBD 中的泄漏电流

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-17 DOI: 10.1063/5.0208706

Weiyi Jin, Yumin Zhang, Songyuan Xia, Qizhi Zhu, Yuanhang Sun, Juemin Yi, Jianfeng Wang, Ke Xu

引用次数: 0

Differences in microstructure and properties of Ti-based amorphous composites between recrystallization and partial remelting and semi-solid isothermal treatment 再结晶和部分重熔与半固态等温处理之间钛基无定形复合材料微观结构和性能的差异

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-17 DOI: 10.1063/5.0226545

Xin-hua Huang, Jin-heng Chen, Yu-huai Wang, Yong-xin Luo, Yue-jun Ouyang

{"title":"Differences in microstructure and properties of Ti-based amorphous composites between recrystallization and partial remelting and semi-solid isothermal treatment","authors":"Xin-hua Huang, Jin-heng Chen, Yu-huai Wang, Yong-xin Luo, Yue-jun Ouyang","doi":"10.1063/5.0226545","DOIUrl":"https://doi.org/10.1063/5.0226545","url":null,"abstract":"The as-cast specimens of Ti48Zr18V12Cu5Be17 amorphous composites were prepared by copper mold suction casting. Next, the as-cast specimens were treated using semi-solid isothermal treatment (SSIT) and recrystallization and partial remelting (RAP). The effects of SSIT and RAP on the microstructure and plasticity were analyzed. The results showed that the microstructure changed from fine crystals in the as-cast specimens to coarse bar crystals and near-spherical crystals in the SSIT and RAP specimens, respectively. The crystals of RAP specimens were finer and rounder than those of SSIT specimens due to recrystallization. In addition, the RAP specimens had high plasticity (20.93%), which is 428.5% and 45.2% higher than the as-cast and SSIT specimens, respectively. By observing the shear bands of the fractured specimens, it was found that the expansion of shear bands could not be impeded by the fine β-Ti crystals in the as-cast specimens, leading to an infinite extension that induces brittle fracture in the specimens. The essential cause of the poor plasticity of the as-cast specimens was revealed. In addition, the coarse β-Ti crystals effectively blocked the shear band expansion in the SSIT specimens, and a large number of shear bands were generated in these crystals. In contrast, the crystals of the RAP specimens had a greater number and density of shear bands compared to those of the SSIT specimens, and these shear bands intersected with each other in different directions. This revealed the mechanism by which the SSIT and RAP methods enhance the plasticity of amorphous composites.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":"65 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142252449","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

Karpman–Washimi ponderomotive force and self-generated magnetic field in nonextensive plasmas 非广延性等离子体中的卡普曼-瓦希米思动力和自生磁场

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-17 DOI: 10.1063/5.0228257

Ming-Chun Qi, Xiao-Song Yang, Chen Xia, San-Qiu Liu

引用次数: 0

Electronic structures and magnetism of MTe2 (M = Cr, V, and Fe) monolayer nanoribbons MTe2（M = Cr、V 和 Fe）单层纳米带的电子结构和磁性

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-17 DOI: 10.1063/5.0223768

Wei Chen, Qi Chen, Jianmin Zhang, Yu Zheng, Ying Long

{"title":"Electronic structures and magnetism of MTe2 (M = Cr, V, and Fe) monolayer nanoribbons","authors":"Wei Chen, Qi Chen, Jianmin Zhang, Yu Zheng, Ying Long","doi":"10.1063/5.0223768","DOIUrl":"https://doi.org/10.1063/5.0223768","url":null,"abstract":"Inspired by the fabrication of the transition metal dichalcogenide nanoribbons with well-defined atomically precise edges, we study the stability, electronic structures, and magnetism of MTe2 (M = Cr, V, and Fe) monolayer nanoribbons. The calculations indicate that all three types of monolayers can form structurally stable zigzag (ZNR) and armchair (ANR) nanoribbons, which significantly alter the properties of the monolayer films, as shown in Table I. For the zigzag nanoribbons, CrTe2-ZNR transitions from a non-magnetic semiconductor to a ferrimagnetic metal. VTe2-ZNR transforms from a ferromagnetic semiconductor to a ferrimagnetic metal. FeTe2-ZNR mostly maintains the characteristics of the monolayer. For the armchair nanoribbons, CrTe2-ANR exhibits ferrimagnetism. The electrical conductivity is related to the width. CrTe2-ANR with narrow width is semiconducting, while wider ones are metallic. VTe2-ANR displays ferromagnetic or ferrimagnetic metallic behavior depending on the width. FeTe2-ANR with widths larger than 11 remains ferromagnetic metal, while with narrow widths are unstable. In addition, the magnetism of all MTe2 monolayer nanoribbons primarily originates from the 3d transition metal atoms. These findings are essential for applications of MTe2 nanoribbons-based low-dimensional spintronic devices.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":"5 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142252450","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

Shaping the future of cancer treatment: The commitment of medical physicists 塑造癌症治疗的未来：医学物理学家的承诺

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-17 DOI: 10.1063/5.0219314

Marwan Al-Raeei

{"title":"Shaping the future of cancer treatment: The commitment of medical physicists","authors":"Marwan Al-Raeei","doi":"10.1063/5.0219314","DOIUrl":"https://doi.org/10.1063/5.0219314","url":null,"abstract":"The incorporation of medical physics into the field of oncology has profoundly changed the ways in which cancer is diagnosed and treated. This article highlights the essential roles that medical physicists play in cancer care, demonstrating how principles from physics improve various aspects of oncology practices. Our analysis reveals that medical physics plays a fundamental role in optimizing various oncological procedures, thereby revolutionizing the management of cancer. Specifically, medical physicists are integral to critical areas such as radiation therapy planning, surgical navigation, and quality assurance, which collectively facilitate personalized and effective treatment strategies for patients. By working closely with healthcare professionals, medical physicists help ensure patients receive top-notch care while minimizing side effects associated with treatments. Their dedication to innovation and research is essential for improving both patient outcomes and quality of life throughout the cancer journey. The ongoing partnership between medical physicists and clinicians is instrumental in propelling advancements in oncology research and clinical practices, leveraging physics principles alongside state-of-the-art technologies to enhance cancer management. As medical physicists commit to excellence and patient-centered practices, they are at the forefront of transforming oncology care, promising improved hope and outcomes for those battling cancer. This collaborative effort ensures a bright future for cancer treatment, where the integration of physics not only optimizes therapeutic approaches but also fosters a comprehensive understanding of cancer care.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":"27 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142252490","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 the electronic structure and lithium diffusion kinetics of amorphous tungsten oxide 探索无定形氧化钨的电子结构和锂扩散动力学

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-17 DOI: 10.1063/5.0229132

Chao Tang, Huachen Liu, Changlong Cai

引用次数: 0

Kinetic Alfvén solitary waves in astrophysical plasmas 天体物理等离子体中的动力学阿尔芬孤波

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-17 DOI: 10.1063/5.0226568

M. M. Hasan, M. R. Hossen, A. A. Mamun

{"title":"Kinetic Alfvén solitary waves in astrophysical plasmas","authors":"M. M. Hasan, M. R. Hossen, A. A. Mamun","doi":"10.1063/5.0226568","DOIUrl":"https://doi.org/10.1063/5.0226568","url":null,"abstract":"The magnetospheric plasma (hot and thin) and the solar wind plasma (cold and dense) are separated by the Earth’s magnetopause, in which plasmas of both origins coexist. Different types of plasma diffusions are found due to this plasma mixing, and kinetic Alfvén solitary waves (KASWs) are one of them. In this work, a theoretical approach is taken to study the fundamental properties of heavy ion acoustic KASWs (HIAKASWs) in a magnetized plasma system whose constituents are nonextensive q-distributed two temperature electrons with dynamical heavy ions. The perturbations of the magnetized collisionless plasma system are investigated using the reductive perturbation technique to deduce the Korteweg–de Vries (K–DV) and modified K–DV (MK–DV) equations to determine the fundamental characteristics of small, but finite amplitude HIAKASWs. The presence of nonextensive electrons, magnetic field, obliquity angle (the angle between the external magnetic field and wave propagation), plasma particle number densities, and the temperature of various plasma species are observed to significantly alter the fundamental properties of HIAKASWs. The findings of our present study may be useful for comprehending the nonlinear wave properties in diverse interstellar plasma environments.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":"42 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142252493","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

Evidence for the quenching of rapid photoresponse by defect generation in ultraviolet illumination of CuSbS2 films 在紫外线照射 CuSbS2 薄膜时通过产生缺陷淬灭快速光响应的证据

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-13 DOI: 10.1063/5.0227670

Y. Takagaki

引用次数: 0

Parallel conducting filaments in resistive switching ZnO thin films 电阻开关氧化锌薄膜中的平行导电丝

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-13 DOI: 10.1063/5.0232595

Tai-Min Liu, Zong-Wei Wu, Ting-An Chien, Pin-Qian Yang, Hua-Shu Hsu, Fang-Yuh Lo

{"title":"Parallel conducting filaments in resistive switching ZnO thin films","authors":"Tai-Min Liu, Zong-Wei Wu, Ting-An Chien, Pin-Qian Yang, Hua-Shu Hsu, Fang-Yuh Lo","doi":"10.1063/5.0232595","DOIUrl":"https://doi.org/10.1063/5.0232595","url":null,"abstract":"This study examines resistive switching in a Cu/ZnO/ITO structure, uncovering an anomalous phenomenon that provides insights into the mechanisms of parallel conducting filaments in ZnO thin films. The current–voltage (I–V) characteristics exhibit a sharp switch at a positive threshold voltage around 2 V, transitioning from a high resistance pristine state to a low resistance state, interpreted as the formation of a Cu filament via electrochemical metallization. However, after this forming process, the device remains in the low resistance state and cannot reset to a high resistance state in either polarity of the applied voltage, suggesting the presence of a strong, unbreakable Cu filament after the forming process. What makes this phenomenon anomalous is the observed weak bipolar resistive switching in the cycles following the forming cycle, despite the presence of the Cu filament. The I–V characteristics of forward- and reverse-bias sweeps suggest that the weak bipolar resistive switching results from an additional filament formed in parallel with the existing unbreakable Cu filament. Using a parallel conducting filaments model, the resistivity of this additional filament is calculated to be ∼10−7–10−5 Ω m, indicating that this filament is likely generated by oxygen vacancies rather than metal atoms in the ZnO films.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":"116 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142252501","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 analysis of pantograph–catenary coupling vibration for high-speed railways 高速铁路受电弓与轨道联轴器振动的数值分析

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-13 DOI: 10.1063/5.0219474

Like Pan, Peihuo Peng, Liming Chen, Fan He

{"title":"Numerical analysis of pantograph–catenary coupling vibration for high-speed railways","authors":"Like Pan, Peihuo Peng, Liming Chen, Fan He","doi":"10.1063/5.0219474","DOIUrl":"https://doi.org/10.1063/5.0219474","url":null,"abstract":"There is a pronounced coupling vibration between the catenary and pantograph during operation for high-speed railways. In this paper, a pantograph–catenary coupling vibration model is constructed to investigate the vibration characteristics under various working conditions. Two different types of catenaries (simple and elastic chain types) are simulated and compared using the finite element method. The pantograph is simplified into a mass–spring–damping combination member, the contact and messenger wires are set to linear beam cells, and the dropper and stitch wire are set to truss cells. The results suggest that the vibration characteristics of the two types of catenaries and pantograph exhibit different trends. The maximum stresses of the messenger wire, dropper, and contact wire do not follow a monotonically increasing trend with the train speed. The maximum stress of the messenger wire under the simple chain type of catenary is higher when the initial contact force increases from 80 to 120 N. However, the maximum stress under the elastic chain type of catenary is higher when the initial contact force is 60 or 140 N. Except for the initial contact force of 140 N, the maximum stresses of the dropper and contact wire under the simple chain type of catenary are lower than those under the elastic chain type. This work provides a valuable reference for optimizing the design of pantograph–catenary systems.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":"208 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142252503","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