- by Dongwei Sun, Zulong Liu, Shuang Yi, Junfeng Chai, Kaibin Liang, Nian Tang, Feng Wang and Lipeng ZhongThe use of , a gas with an extremely high global warming potential, has been increasingly restricted, while gas mixtures are regarded as one of the most promising environmentally friendly insulating media for high-voltage applications and have already been employed in eco-friendly gas-insulated equipment. Lightning impulse insulation performance is an important criterion for evaluating the dielectric performance of novel gas-insulated equipment. However, fully relying on lightning impulse tests to determine the breakdown characteristics and the effects of key influencing factors […]
- by Igor E Filatov and Dmitrii L KuznetsovAn experimental approach is proposed to determine the relative reactivity of volatile organic compounds (VOCs) in air relative to the components of non-equilibrium discharge plasma. The experimental data were processed using the global kinetics method. It is shown that the relative reactivity of VOCs is a parameter that is weakly dependent on the plasma generation method, while the energy consumption for removing an impurity molecule varies significantly depending on the specific setup and plasma generation method. Using a mixture of […]
- by Pravin Sharma and Gunter LĆ¼pkeWe have performed atomistic spin-dynamics simulations to investigate how temperature and thickness affect the Gilbert damping parameter of the ferromagnetic CoFe thin film and its interface with MgO. Enhanced interfacial damping is considered at the interface compared with the bulk-like layers due to high spināorbit coupling. Our results reveal a strong dependence of Gilbert damping on thickness, consistent with experimental results for soft magnets. The enhancement of Gilbert damping at the interface was found to be greater than in bulk-like […]
- by Fuqian YangCurrent-assisted processing has increasingly been used to tune material microstructures and to heal structural flaws. At the heart of this technique is the interaction between electric current and the material, which induces localized heating, enhances atomic migration, and activates related physicochemical processes. In this work, we analyze the flow of electric current in an infinite conducting medium containing a planar crack, specifically a Griffith-like crack and a penny-shaped crack, and the resulting steady-state, current-induced temperature field. Closed-form solutions for both […]
- by Duo Zhao, Zhiheng Fang, Shixing Tao, Shouxian Li, Jianzhu an, Zhiyu He, Xu Wang, Zhiyong Xie, Jianhua Meng, Jing Wang, Guangwei Meng, Fang Wang and Qiong Li
- by Joongwon Lee, Thai-Son Nguyen, Len van Deurzen, Debaditya Bhattacharya, Chandrashekhar Savant, Siddhartha Ghosh, Patrick Shea, Carl Bernard, Huili Grace Xing, Debdeep Jena and Farhan RanaAlloys of AlN have rapidly emerged as a material platform for nonlinear optics. In this paper, we measure the second-order optical nonlinearity of AlScN films grown directly on nitrided c-plane sapphire by molecular beam epitaxy. This direct growth approach, which bypasses a thick AlN buffer layer, substantially reduces the influence of the buffer layer on the measured nonlinear response of the AlScN film. Our results show a large enhancement of , while no statistically significant enhancement of is resolved within […]
- by Seyed Mojtaba Taheri Balanoji and Seyed Mortaza Taheri BalanojiSelective formation of reactive ionic species out of CO plasmas is currently attracting significant attention for application in plasma processing, ion implantation, plasma-assisted catalysis, and innovative CO utilization approaches. In electron cyclotron resonance ion sources (ECRISs), the composition and extraction properties of the reactive ion beams are determined by the intricate interplay between electron heating, plasma transport, collisional plasma chemistry, and extraction-field dynamics, complicating the optimization of the operational conditions. In this work, a multi-stage numerical framework is devised to […]
- by Shipra Das, S Leelashree, Santanu De, Sanjib Nayak, M JakubÄin, I Å korvĆ”nek, P Murugavel and Santhosh P Nagappan NairHigh-entropy rare-earth orthoferrites with composition (Dy0.2Ho0.2Sm0.2Er0.2Tm0.2)Fe1āxMnxO3 (x = 0.0, 0.25, 0.35), provide an effective platform to investigate entropy-driven tuning of structural distortion and magnetic functionality. Incorporation of JahnāTeller active Mn-cations induce octahedral distortion, resulting in pronounced modifications to lattice vibrations and magnetic behavior. Raman spectroscopy reveals the appearance of an additional vibrational mode near (ā¼650 cmā1) in Mn-doped samples, confirming Mn-induced structural distortion. A substantial shift in the spin-reorientation temperature from 96 to 259 K, demonstrating strong sensitivity of magnetic […]
- by Zhenxin Zuo, Dong Wang, Zhaolin Li, Qi Wang, Xin Zhang, Yifan Wang, Haoxuan Wang, Feng Deng, Wenyuan Liu, Liang Ji, Xu Liang and Shengping ShenFlexoelectricity is a prominent and ubiquitous electromechanical coupling in dielectrics, which refers to the coupling between elastic strain gradients and electric polarization, or vice versa. This specific electromechanical coupling is independent on the materialās lattice symmetry, noticeable at the nano-scale, and sustain beyond the Curie temperature in ferroelectric materials. Thin film materials are emerged as the fundamental building blocks for constructive functional devices in chips, microelectromechanical systems and nanoelectromechanical systems driving by the advancements in micro- and nano-technologies. Flexoelectricity becomes […]
- by Wenzhe Li, Siyuan Chen, Shuang Wang, Tao Peng, Xiaotao Han, Heteng Zhang and Liang LiThe axially stacked pulsed magnet exhibits distinct advantages in reducing energy demands and mitigating electromagnetic coupling, but comprehensive investigations into its electromagnetic characteristics and subsequent design optimization remain insufficient. To address this, a 2D axisymmetric finite-difference time-domain computational method is developed for multi-physics analysis. This method accurately simulates axial and radial magnetic field penetration within conductor cross-sections, while accounting for eddy-current and magnetoresistance effects during discharge. Consequently, transient 2D electromagnetic and thermal characteristics can be rapidly calculated for each individual […]
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