AIP Advances最新文献_第4页

MoSe2 nanoflakes for zinc ion storage 用于锌离子存储的 MoSe2 纳米薄片

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-11 DOI: 10.1063/5.0226948

Renzhi Jiang, Yuncheng Cai

引用次数: 0

Experimental study of discharge current oscillations with dust particles 带尘埃粒子的放电电流振荡实验研究

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-10 DOI: 10.1063/5.0222899

Nidhi Patel, G. Prasad

引用次数: 0

Study on the cracking process of epoxy resin under oxygen and water atmosphere based on ReaxFF force field 基于 ReaxFF 力场的氧气和水环境下环氧树脂开裂过程研究

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-10 DOI: 10.1063/5.0226686

Xiajin Rao, Boya Peng, Lei Zhang, Dajian Li, Wei Zhang, Peng Liu, Fangyuan Han, Liangyuan Chen, Yi Su, Le Wang, Shaoming Pan, Rui Li, Wei Huang, Min Yu

{"title":"Study on the cracking process of epoxy resin under oxygen and water atmosphere based on ReaxFF force field","authors":"Xiajin Rao, Boya Peng, Lei Zhang, Dajian Li, Wei Zhang, Peng Liu, Fangyuan Han, Liangyuan Chen, Yi Su, Le Wang, Shaoming Pan, Rui Li, Wei Huang, Min Yu","doi":"10.1063/5.0226686","DOIUrl":"https://doi.org/10.1063/5.0226686","url":null,"abstract":"Amino-cured epoxy resins are widely used in the electrical and electronic industry for their excellent properties. To investigate the mechanism of the effect of O2 and H2O on the pyrolysis behavior of epoxy resin, in this paper, the cross-linked structure of bisphenol A type epoxy resin cured by adducts of diethylenetriamine and butyl glycidyl ether is modeled based on the ReaxFF force field, and the thermal decomposition processes at different temperatures and gas atmospheres were simulated and the pathways of the small molecule products were clarified. The results show that epoxy resin will produce small molecule gas products, such as H2, CO, H2O, OH, CH2O, and free radicals, in the process of pyrolysis; the presence of amino groups also generates nitrogen-containing radicals, such as CN, CH2N, and C2H4N; as the reaction temperature increases, the rate of pyrolysis reaction will be accelerated. The same temperature in oxygen and water atmospheres can accelerate the breakage of epoxy resin main chain by promoting the breakage of carbon and oxygen bonds and, at the same time, promote the generation of small molecule gases, such as H2 and CO.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224431","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

Fluid-acoustic monolithic simulation based on spectral element method to solve flows past a slotted circular cylinder at low Reynolds numbers 基于谱元法的流体-声学整体模拟，用于解决低雷诺数下流经开槽圆筒的问题

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-10 DOI: 10.1063/5.0215719

Ya Zhuo, Guoliang Qin, Ximeng Ye

{"title":"Fluid-acoustic monolithic simulation based on spectral element method to solve flows past a slotted circular cylinder at low Reynolds numbers","authors":"Ya Zhuo, Guoliang Qin, Ximeng Ye","doi":"10.1063/5.0215719","DOIUrl":"https://doi.org/10.1063/5.0215719","url":null,"abstract":"Aerodynamic noise resulting from the flow around cylinders is a significant engineering challenge in aviation and wind engineering. The phenomenon of alternating vortex shedding in the flow leads to vibration and noise generation. However, accurately describing both the flow field and the sound field is challenging due to the significant difference in magnitude between them. To tackle this issue, this work introduces the application of the spectral element method (SEM) and flow-acoustic monolithic simulation for solving the two-dimensional compressible Navier–Stokes equations at low Reynolds numbers. This study is to investigate the reduction of flow-induced noise through the implementation of slotting technology on a circular cylinder. This study focuses on examining two different slit width ratios, s/d = 0.15 and 0.25, with a slit angle of attack of 0°. A comparative analysis is conducted between a complete circular cylinder and a slotted circular cylinder. The findings indicate that the slotted cylinder exhibits reduced intensity of vortex shedding and an extended region of downstream vortex generation compared to the complete cylinder. Notably, when s/d = 0.25, the slotted cylinder demonstrates minimal noise generation. Even at s/d = 0.15, a significant reduction in flow-induced noise is observed. These results highlight the potential of utilizing slotting technology on cylinders to effectively mitigate aerodynamic noise. The application of SEM and flow-acoustic monolithic simulation shows their relevance in analyzing and designing noise mitigation techniques in aerodynamics. This work can develop innovative solutions to reduce noise and improve the performance of various applications in aviation and wind engineering.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142185394","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

Research on single-phase grounding fault location technology in distribution networks based on impedance method 基于阻抗法的配电网单相接地故障定位技术研究

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-10 DOI: 10.1063/5.0225951

Sha Wang, Shengkai Wei

引用次数: 0

Analysis of noise and its characteristics in avalanche photodiode 雪崩光电二极管的噪声及其特性分析

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-09 DOI: 10.1063/5.0229293

XiaoFei Jia, Qun Wei, Yan Zhu, WenPeng Zhang

引用次数: 0

Broadband metamaterial linear polarization converter designed by a hybrid neural network with data augmentation 利用混合神经网络设计的宽带超材料线性偏振转换器

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-09 DOI: 10.1063/5.0224049

Junyu Hua, Xiaodong He

{"title":"Broadband metamaterial linear polarization converter designed by a hybrid neural network with data augmentation","authors":"Junyu Hua, Xiaodong He","doi":"10.1063/5.0224049","DOIUrl":"https://doi.org/10.1063/5.0224049","url":null,"abstract":"Deep learning techniques provide a new approach to the design and optimization of electromagnetic metamaterials. This study used a convolutional neural network and long short-term memory (CNN–LSTM) hybrid network to design and optimize a broadband metamaterial reflective linear polarization converter. The data augmentation method was also employed in few-shot learning to reduce optimization costs and improve model prediction performance. With the inverse prediction, a linear polarization converter that perfectly covers the Ku-band was obtained and fabricated with flexible printed circuit technology. Both simulation and experimental results indicate that this network can accurately predict the structural parameters. The polarization converter not only achieves remarkable broadband polarization conversion efficiency spanning the 2.2–18 GHz range but also maintains precise cross-polarization control across the entire Ku-band. The mean polarization conversion ratio in the Ku-band was calculated to be an impressive 99.69%. Finally, the mechanism of polarization conversion and the influence of each structural parameter on its performance further verify the optimality of the inverse design model. The use of CNN–LSTM deep learning methods significantly simplified the design process of electromagnetic metamaterials, reducing design costs while ensuring high design precision and excellent performance.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224432","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

Non-limited vibrational effect on shock-induced phase transitions of condensed fluid in hard-sphere model 硬球模型中凝聚流体冲击诱导相变的非限制振动效应

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-09 DOI: 10.1063/5.0231113

Yue Zheng, Junjun Xu, Ke Tang

{"title":"Non-limited vibrational effect on shock-induced phase transitions of condensed fluid in hard-sphere model","authors":"Yue Zheng, Junjun Xu, Ke Tang","doi":"10.1063/5.0231113","DOIUrl":"https://doi.org/10.1063/5.0231113","url":null,"abstract":"The essence of fluid phase transition is the jump of physical properties distinctly induced by shock waves in the hard-sphere model. Due to the strong impact of the wave, the internal freedoms of molecules are stimulated, releasing tremendous energy that commonly triggers the phase transition. Conversely, typical thermal and dynamic jumps can be described by the Rankine–Hugoniot conditions based on the Euler equation. In the theoretical simulation, the initial density and rotational freedoms of molecules are directly regarded as the primary factors to affect processes of phase transition. However, the influence of vibrational freedom in molecules has not been discussed yet. As the increasing temperature can gradually excite the affection of vibrational freedom, it is unwise to assume that the temperature element is constant in the theory. What would be a suitable model that accurately reflects the relationship between temperature and affection from vibrational freedom? The non-limited model has been courageously attempted with the temperature range from T0 to 6T0 (T0 is unperturbed temperature). We have found that the vibrational freedom can have a great effect on properties during phase transition processes.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142185398","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

Analysis of edge stress of combined shell under internal waves 内波作用下组合壳体边缘应力分析

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-09 DOI: 10.1063/5.0225674

Yiqiong Cui

引用次数: 0

Experimental investigation on the tribo-mechanical behavior of PMMA reinforced by solid lubricant filler for dental implant applications 固体润滑剂填充物增强的 PMMA 在牙科植入物应用中的三重力学行为实验研究

IF 1.6 4区物理与天体物理

AIP Advances Pub Date : 2024-09-09 DOI: 10.1063/5.0225107

Mohamed S. Abdo, Muhammad A. Shar, Ahmed Fouly, Mushtaq A. Dar, Hany S. Abdo

{"title":"Experimental investigation on the tribo-mechanical behavior of PMMA reinforced by solid lubricant filler for dental implant applications","authors":"Mohamed S. Abdo, Muhammad A. Shar, Ahmed Fouly, Mushtaq A. Dar, Hany S. Abdo","doi":"10.1063/5.0225107","DOIUrl":"https://doi.org/10.1063/5.0225107","url":null,"abstract":"This study investigates the enhancement of mechanical and tribological behavior in polymethyl methacrylate (PMMA) composites reinforced with graphene oxide (GO) as a solid lubricant filler for advanced biomedical applications, particularly dental implants. PMMA/GO composites were prepared with varying weight percentages of GO (0, 0.2, 0.5, 0.7, and 1 wt. %) to assess their impact on material performance. A noteworthy improvement in both tensile strength and Young’s modulus was detected, reaching up to 141% and 10.6%, respectively, at optimized GO loadings of 1%. Microstructural analysis utilizing scanning electron microscopy for the worn surface revealed enhanced dispersion and interfacial adhesion between GO and the PMMA matrix, reinforcing mechanical coherence. Tribological properties also demonstrated enhancement, with PMMA composites containing 1 wt. % GO exhibiting optimal mechanical and tribological characteristics compared to lower weight fractions. Moreover, microscopic examination revealed a shift in the wear mechanism of the PMMA-GO composite, which was attributed to the lower friction coefficient obtained by GO integration.","PeriodicalId":7619,"journal":{"name":"AIP Advances","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142185401","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