AIP Advances最新文献

Mathematical analysis of the Wiener processes with time-delayed feedback 具有延时反馈的维纳过程的数学分析

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-19 DOI: 10.1063/5.0209241

Miki U. Kobayashi, Kohta Takehara, Hiroyasu Ando, Michio Yamada

引用次数: 0

Numerical simulation and experimental study of the dynamic characteristics of a gas turbine rotor system with beam sea and head sea excitation 梁海和顶海激励下燃气轮机转子系统动态特性的数值模拟和实验研究

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-19 DOI: 10.1063/5.0220752

Xin Zhang, YongBao Liu, Qiang Wang, ZhiKai Xing, Mo Li

{"title":"Numerical simulation and experimental study of the dynamic characteristics of a gas turbine rotor system with beam sea and head sea excitation","authors":"Xin Zhang, YongBao Liu, Qiang Wang, ZhiKai Xing, Mo Li","doi":"10.1063/5.0220752","DOIUrl":"https://doi.org/10.1063/5.0220752","url":null,"abstract":"Vibration analysis is crucial for studying rotor dynamics. The gas turbine rotor system is subjected to complex alternating loads during navigation, resulting in vibrations transmitted to the bearings that alter the system’s dynamic characteristics. Based on the similarity law of the wave resistance test, a hull model was established. Beam sea and head sea tests were conducted in the towing pool to measure the acceleration response at the key positions. A finite element model of the turbine rotor system was established, and the test data were imported into the model after wavelet noise reduction and resampling to calculate the vibration response at the front and rear bearing points. The vibration responses transmitted to different locations and directions caused by beam sea and head sea conditions were analyzed. A comparison and analysis were conducted on the acceleration responses in various locations and directions under beam sea or head sea conditions. The equivalent von Mises stress distribution of the gas turbine rotor system under beam sea and head sea loads was obtained. The vibration transfer model was verified for accuracy and can be used to quickly analyze the vibration response of bearings under wave load transfer. This study provides a theoretical basis and reference for enhancing the stability of the gas turbine rotor system.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142252442","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

Flexible and anisotropically conductive film by assembly of silicone rubber and cobalt-coated glass fiber composites 通过硅橡胶和钴涂层玻璃纤维复合材料的组装实现柔性和各向异性导电薄膜

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-18 DOI: 10.1063/5.0226566

Ruihua Zhou, Baoyu Tan, Hairu Li

{"title":"Flexible and anisotropically conductive film by assembly of silicone rubber and cobalt-coated glass fiber composites","authors":"Ruihua Zhou, Baoyu Tan, Hairu Li","doi":"10.1063/5.0226566","DOIUrl":"https://doi.org/10.1063/5.0226566","url":null,"abstract":"In this study, we prepared electromagnetic cobalt-coated glass fiber (Co@GF) composites via an electroless plating method. Subsequently, a conductive sandwich flexible film consisting of Co@GF composites and liquid silicone rubber (RTV-2) was successfully formed using the tape casting method at room temperature. Based on the perfect coating and excellent electrical conductivity of the Co@GF composites, the resultant RTV-2/Co@GF/RTV-2 sandwich flexible film showed a low volume resistivity of 0.264 Ω·cm and could stretch to 100% (of 4.40 Ω·cm) without obvious fracture. When a magnetic field was applied during the curing process, the electromagnetic Co@GF composites were aligned automatically in the RTV-2 matrix because of their ferromagnetic nature. The as-prepared film exhibited anisotropy in its electrical performance. The volume resistivity parallel to the magnetic field direction is approximately two times lower than that in the perpendicular direction. The maximum difference in the volume resistivity (ρ∥ = 0.768 Ω·cm and ρ⊥ = 1.549 Ω·cm) was obtained at a magnetic field intensity of 800 mT. In addition, a magnetic field intensity of 100 mT helps improve the electrical conductivity of the as-obtained sandwich film. The anisotropic RTV-2/Co@GF/RTV-2 sandwich flexible film is considered a promising flexible electronic sensor, where discrepant inductive sensitivity is required in orthogonal directions.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142252445","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

First spectroscopic studies in the plasma-beam installation 等离子体束装置中的首次光谱研究

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-18 DOI: 10.1063/5.0224254

B. Chektybayev, S. Zhunisbek, Ye Kashikbayev, A. Duisen, I. Sokolov, T. Tulenbergenov

{"title":"First spectroscopic studies in the plasma-beam installation","authors":"B. Chektybayev, S. Zhunisbek, Ye Kashikbayev, A. Duisen, I. Sokolov, T. Tulenbergenov","doi":"10.1063/5.0224254","DOIUrl":"https://doi.org/10.1063/5.0224254","url":null,"abstract":"This paper presents the results of spectroscopic measurements of plasma in a linear simulator of a plasma-beam installation (PBI) for conducting materials science research. For the first time, non-contact optical diagnostic methods were employed to measure the plasma parameters in the PBI. These measurements were allowed for the clarification of the PBI plasma parameters and the identification of transition zones in different operational modes. Analysis of the plasma emission spectrum enabled the identification of impurity spectral lines and the estimation of key plasma parameters under varying experimental conditions. The spectra were recorded using two optical spectrometers covering a wavelength range of 200–800 nm. The experimental conditions varied in terms of electron beam accelerating voltage (1–5 kV), working gas pressure (1–6 mTorr), and target bias voltage (from −500 to −100 V). The Boltzmann plot method and Stark broadening of the Balmer lines were used to estimate electron temperature and density. Based on the obtained spectroscopic data, the electron density and the electron temperature were determined. The methods described in this study are applicable to linear plasma devices.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142252451","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

Design and simulation of a Ka-band frequency doubling gyroklystron amplifier Ka 波段倍频陀螺回旋放大器的设计与仿真

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-18 DOI: 10.1063/5.0190157

Abhijeet Singh, Madan Singh Chauhan, Neelam Srivastava

引用次数: 0

Decomposition characteristics and influencing mechanisms of C4F7N/CO2 gas with different metal materials C4F7N/CO2 气体与不同金属材料的分解特性及影响机理

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-18 DOI: 10.1063/5.0214100

Yuan Yang, Keli Gao, Hao Wang, Shuai Yuan, Jinchao Du, Yansong Ji, Dehui Fu, Yin Huang, Guangkai Cui

{"title":"Decomposition characteristics and influencing mechanisms of C4F7N/CO2 gas with different metal materials","authors":"Yuan Yang, Keli Gao, Hao Wang, Shuai Yuan, Jinchao Du, Yansong Ji, Dehui Fu, Yin Huang, Guangkai Cui","doi":"10.1063/5.0214100","DOIUrl":"https://doi.org/10.1063/5.0214100","url":null,"abstract":"C4F7N/CO2 gas mixture, as the main new environmentally friendly gas insulation medium, is now being widely used in the ring network switchgear and other gas electrical equipment. In this paper, a test platform was constructed to simulate partial discharge in a gas medium, the decomposition characteristics of the C4F7N/CO2 gas mixture during suspended potential discharge were studied under four different metal electrode materials: stainless steel, purple copper, tungsten copper, and aluminum alloy. The results show that the main decomposition products of the C4F7N/CO2 gas mixture during suspended discharge are CO, CF4, C4F8, C3F8, C3F6, CF3CN, and C2F4 gases, which are independent of the metal material. On the whole, when the metal electrode material is stainless steel, the highest amount of decomposition products are generated from the C4F7N/CO2 gas mixture; when the metal electrode material is aluminum alloy, the amount of decomposition products produced by C4F7N/CO2 gas mixture is the least, and the content difference of some decomposition products between these two metal materials is as high as 70%. The decomposition products of the C4F7N/CO2 gas mixture decreased gradually with the increase in the gas pressure. Finally, the influence mechanism of different metal materials on the decomposition process of the C4F7N/CO2 gas mixture was analyzed from the microscopic perspectives of charge transfer between gas molecules and molecular structural characteristics. In general, the research results can provide technical reference for the design, selection, and optimization of environmental protection gas insulation equipment.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142252446","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

Bridgeless modified Cuk–SEPIC power factor correction converter for E-bicycle applications 用于电动自行车应用的无桥改进型 Cuk-SEPIC 功率因数校正转换器

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-18 DOI: 10.1063/5.0229333

Shunmathi M., Julius Fusic S., Shanmugavel Rajesh, Jayant Giri, Sathish T., Abdullah Alarifi, S. M. Mozammil Hasnain

引用次数: 0

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":null,"pages":null},"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