- by Fan Luo, Xian Zhou, Hongqin Yang, Wang Yao and Zhaoyang ShenThis paper presents a dual-band metamaterial differential sensor with dual-detection modes for the permittivity characterization of materials. The design aims to address common limitations in metamaterial sensors, such as susceptibility to environmental factors and reliance on single-mode detection. The sensor employs a differential configuration to suppress common-mode interference from the environment. Furthermore, by integrating a branch-line coupler with a complementary split-ring resonator (CSRR) structure, it achieves the capability to detect permittivity variations through both amplitude changes and frequency shifts. Through […]
- by Zhicui Wang, Qiuyue Ma, Yangfeng Ge, Yong Liu and Guochun YangTwo-dimensional (2D) magnetic materials, with their atomically thin layers, provide scalable, low-dissipation platforms for advanced spintronic devices. Here, we propose a tetragonal Fe2BC monolayer, in which Feā(B/C)āFe bond angles perfectly locked at 90Ā°. The monolayer exhibits robust room-temperature ferromagnetic (FM) half-metallicity with a Curie temperature (TC) of 442 K and a large magnetic anisotropy energy of 251 Ī¼eV per Fe. FM coupling between neighboring Fe atoms is strongly mediated by superexchange interaction through the intervening B/C atoms. Moreover, the Fe2BC […]
- by Qiang Zhan, Xiaodong Zhang, Shuang Yu, Hao Yu and Bo ZhouP2-type layered transition metal oxides (P2-ATMOā, A = Li, Na, K, Mg; TM = Mn, Co, Ni) are promising cathode materials for rechargeable batteries due to their open framework, which facilitates efficient charge carrier diffusion. However, these materials undergo complex phase transitions during charging and discharging cycles, significantly impacting battery performance. Phonon properties provide critical insights into structural stability and phase transitions, thus providing guidance for enhancing cathode stability. In this study, we investigated the phonon and electronic properties of […]
- by Bangkai Qian, Chuyan Zhang, Fanghui Yin, Liming Wang and Bin CaoUnusual flashovers of composite insulators with low pollution levels under rainfall conditions have been observed in recent years, yet their mechanisms remain unclear. This study investigates the triboelectric charging of hydrophobic silicone rubber surfaces under simulated rainfall. Using a custom-built water dripping platform, the charge of sliding water drops was measured by both a Faraday cup and a fine tungsten-wire probe connected to a current amplifier, while the surface potential distribution was obtained through electrostatic voltmeter scanning. Results show that […]
- by Zhanpeng Sun, Qijun Wang, Rui Li, Zhaofu Zhang, Xiang Sun, Wei Shen and Gai WuGallium oxide (Ga2O3) is an ultra-wide bandgap semiconductor with excellent potential for high-power device applications. Some defects will inevitably occur during the growth of Ga2O3. Dislocations, as one of the main defects, have a significant impact on the mechanical and electrical properties of materials. In this work, dislocations in Ī²-Ga2O3 are systematically studied via first principles calculations, with a primary focus on the screw dislocation occurring on the ( ) plane with b= . The concept of Gatetra-Gaocta-dislocation is proposed. […]
- by Yaqi Fang, Hao Zeng, Chuihui Zeng, Rui Li, Suhan Mao, Nnditshedzeni Eric Maluta and Xiaoxing ZhangChinaās energy resources and load centers are unevenly distributed, and many extra-high voltage and ultra-high voltage projects pass through high-altitude regions, posing challenges for air-gap insulation. Understanding streamer behavior in high-altitude conditions aids in optimizing insulation design for power systems. This paper conducts positive switching impulse discharge experiments on sphereāplane gap with electrode radii of 0.15ā0.45 m and a gap distance of 2 m at 2100 m altitude. The critical inception voltage, boost time delay, and statistical time delay are […]
- by Usha Rani Swargiary, Prabhat Sharma, Manoar Hossain and Maidul IslamWe investigate electrically induced, near-field coupled dipole resonant mode with a high-quality factor (Q) in a terahertz (THz) meta-waveguide. The waveguide structure is composed of I-shaped aluminum metamaterial constituents, placed periodically on a copper-quartz bilayer substrate in the propagation direction of an incident THz beam. The electric field vector is set along a I-shape design in the transverse direction of the meta-waveguide, leading to the excitation of a strong dipole resonance around the I-shaped meta-atom. The dipole resonance is quite […]
- by Yuan Yao, Matthew Musgrave, Zecong Qin, Qingbo Zheng, Han Gao, Jian Tang, Junsong Xie, Xu Qin, Long Tian, Yujie Zheng, Decai Ma, Junpei Zhang, Tianhao Wang and Xin TongRadio frequency (RF) plasma discharge constitutes a critical step in the generation of polarized 3He by metastability exchange optical pumping (MEOP). In this study, a model of an inductively coupled plasma device is employed to investigate plasma parameters and enhance the design of coils and plasma characteristics using COMSOL simulations. The findings are compared with experimental results obtained from the MEOP system at the China Spallation Neutron Source (CSNS). The influence of inductive coil configuration and other parameters (gas pressure, […]
- by Wenlong Li, Hailong Li, Yifan Tang, Yun Zhang, Shibin Xu, Yu Qin, Wanshan Hou, Haixia Liu, Licun Wang, Bin Wang, Yong Yin, Xiangwei Tang and Lin MengAs people continue to pursue an enhanced cooking experience, this paper proposes a microwave heating uniformity improvement system that effectively integrates the benefits of injection-locking technology. This system facilitates microwave frequency and phase scanning by integrating an external injection structure. A microwave heating cavity optimized for uniformity improvement system requirements is designed by simulation of the voltage standing wave ratio within the heating cavity. Properly tuning the impedance matching between the load and the transmission lineās characteristic impedance ensures that […]
- by Linxiao Wu, Junming Zhao, Tian Jiang, Ke Chen and Yijun FengAsymmetric transmission of circularly polarized (CP) waves holds immense potential for a wide range of applications, including spectroscopy and optical communications. Nevertheless, state-of-the-art structures designed for CP asymmetric transmission typically suffer from a constrained operating bandwidth (BW), which hinders their widespread adoption. To address this challenge, this paper introduces a pioneering receiverātransmitter meta-atom that achieves a broad asymmetric transmission BW for CP waves. The current-cutting effect, induced by rectangular slots etched into the patches of the meta-atom, is fully harnessed […]
- by S Yu and A von KeudellThe combination of plasma and catalysis allows flexible solutions for species conversion. Any plasma catalysis synergism can constitute either of plasma conversion enhanced by a surface process or a surface process enhanced by plasma-excited species as reaction partners. The first case of the impact of a catalytic surface on plasma dynamics is investigated using phase-resolved optical emission spectroscopy (PROES) in RF helium and argon discharges with nitrogen, hydrogen, and oxygen admixtures. Different surfaces are being employed, and the electron energetics […]
- by Zhiying Zhou, Xi Chen, Haitao Dai and Qieni LuPhotodetectors (PDs) capable of self-powered, wavelength-selective dual-band detection are highly desirable for secure optical communication, multispectral sensing, and encryption systems. In this work, we report a self-powered UVāvisible dual-band PD based on a p-CuBr/n-GaN heterojunction. The device was fabricated by thermally evaporating a 300 nm CuBr film onto an n-type GaN substrate, forming a type-II band alignment that generates an internal electric field of approximately 1.82 eV for efficient charge separation under zero bias. Distinct photoresponse peaks at 360 nm […]
- by Bibekananda PaikarayA magnetic skyrmionium, a skyrmion-like spin configuration with zero net topological charge, is a promising candidate for non-volatile spintronic information-processing technologies, and its ultrafast gigahertz-range dynamics open avenues for exploiting these topologically protected nanostructures in high-frequency applications. This work explores the tunable microwave response of skyrmionium in a nanodisk through micromagnetic simulations. The study examines how variations in disk size, the number of skyrmioniums, and material parameters influence the GHz-frequency response, along with a comparative analysis with skyrmions. Resonance modes […]
- by Yige Xian, Xuemei Cheng, Xinze Lu, Delong He, Yang Ma and Jinbo BaiA thorough understanding of soot particle formation and evolution during combustion is essential for improving energy efficiency and reducing pollutant emissions. In this study, we constructed an integrated diagnostic method combining two separate pulses with traditional two-color laser-induced incandescence (LII) and particle size analysis models, enabling simultaneous acquisition of multiple parameters (including initial temperature T0, peak temperature TM, absorption function Em, volume fraction fv, and primary particle size Dp). This system has high spatial and temporal resolution, allowing for detailed […]
- by B Arun, Jisna Rahman, Raman T S Akhil, Asokan Kandasami, N E Rajeevan and K C James RajuThis study focuses on the effect of electronic excitation induced by swift heavy ion (SHI) irradiation on the structural, morphological, and magnetic properties of FeGaB thin films deposited on an Al2O3 (0001) single crystal substrate via radio frequency magnetron sputtering. The FeGaB films were irradiated with 140 MeV Ag11+ ions at three different fluences: 1 Ć 1011, 1 Ć 1012, and 1 Ć 1013 ions cmā2. The x-ray diffraction patterns and field emission scanning electron microscope images confirm that SHI […]
Mass spectrometry websites, social media, journal feeds, and other links and items of interest to the mass spectrometry community.
