- by Antonios Makridis, Nikolaos Maniotis, Georgios Natsiopoulos and Makis AngelakerisMagnetic particle hyperthermia (MPH) is a rapidly advancing field with significant potential for biomedical applications; however, the interpretation and comparison of experimental and theoretical results remain challenging due to variability in nanoparticle properties, excitation conditions, and analysis methodologies. In this work, we introduce an open-access online toolbox developed to support education, data analysis, and experimental optimization in MPH research. The toolbox provides a unified framework for estimating key physical properties of magnetic nanoparticles (MNPs) as functions of size, magnetic anisotropy, […]
- by Yan Zhang, Gengmin Zhang, Xianlong Wei and Wensheng ZhouNew types of miniature vacuum electron tubes are under intense study. Previously, planar nanoscale vacuum channel transistors (NVCTs) with resistive-switching (RS) SiOx electron sources have been developed, in which the current collected by the Collector electrode—and thus the ON/OFF state—can be well controlled by the voltage applied to the Grid electrode. In this work, the application potential of RS-based NVCTs for logic operations was explored. The Si substrate was utilized as the Back Grid electrode, and its modulation of the […]
- by Hao Wang, Dandan Liu, Qinhan Zeng, Haifeng Yin and Yizhou ZhengHigh-order harmonic generation was simulated for benzene, furan, pyrrole, thiophene, cyclopentane, and trans-1,3-butadiene in intense linearly polarized laser fields using time-dependent density functional theory. The harmonic spectra were compared for multiple driving wavelengths and peak intensities, and polarization-resolved emission was analyzed to separate in-plane and out-of-plane responses. Plateau yield, plateau extent, and cutoff energy were evaluated and related to vertical ionization potentials and aromaticity descriptors. Within the wavelength–intensity range explored here, aromatic and heteroaromatic rings exhibit stronger plateau emission than […]
- by Chenglin Li, Mingyong Xin, Jingran Chen, Jie Liu, Xin Li, Xi Wang and Caijiang LuSelf-powered wireless sensor nodes are highly desirable for Internet of Things (IoT) applications. Among various energy-harvesting technologies, magneto-mechano-electric (MME) harvesters are attractive for scavenging stray magnetic field energy. However, conventional MME harvesters cannot efficiently utilize the circumferential magnetic field around transmission lines, resulting in limited magnetic-to-force transduction and low output performance. In this work, a U-shaped flux-focusing magnet circuit is proposed to enhance the output of MME harvesters for transmission lines. Its effectiveness is systematically verified through theoretical modeling, finite-element […]
- by Chuang Zhang, Zixi Liu, Zhengkai Feng, Jingcheng Zhang, Xinlu Li, Ruomeng An, Shihang Wang and Shengtao LiHigh-frequency harmonics (>10 kHz) generated by high-voltage semiconductor devices, combined with extremely cold environments, pose a serious threat to the insulation reliability of power equipment for clean energy utilization. This paper investigates the breakdown characteristics of epoxy resin-impregnated paper (EPIP) used in dry type busing under low-temperature and high-frequency harmonic conditions, with focus on the influence of dielectric loss and the orientation of crepe paper within the EPIP on breakdown strength. Additionally, the breakdown mechanism is investigated in relation to […]
- by Ayşe Sönmez, Sümeyye Cörüt, Semran Ipek, Osman Öztürk, Savaş Berber and MirHasan Yu SeyidovThe optical properties and band structure of hydrogenated nanocrystalline silicon (nc-Si:H(x) and nc-Si:H(x)A, where the symbol marks the hydrogen flow rate and the superscript indicates the annealed samples) in ultrathin films are investigated using UV-visible spectroscopic ellipsometry (SE) and ultraviolet photoelectron spectroscopy (UPS). The optical properties were investigated using SE in the photon energy range of ∼1.4–4.1 eV at room temperature. UPS spectra obtained with 21.2 eV photons were used to examine the differences between the Fermi level ( ) […]
- by Yunfeng Luo, Shuo Wang, Fuhua Cao and Yiren WangDensity functional theory calculations are applied to perform a systematic study on the interaction between oxygen atoms and interface structure in W/Cu composites. The interactions between all considered O-incorporated defects and the interface are attractive, which can be understood by a combination of thermodynamic and electronic interactions. We find that oxygen can form spontaneously in the interfacial region of the W/Cu composite while it can be detrimental to the interfacial binding. Furthermore, we explore the synergistic effect among interfacial vacancies […]
- by Rui Yang, Haoxuan Sun, Peidong Wu, Yaping Cui, Fangcheng Lv and Xiang YuAs high-voltage power systems progress, there arises an urgent demand for high-performance insulating materials to ensure stable operation and prolonged service life. Poly (m-phenylene isophthalamide) (PMIA) aramid is recognized for its inherent mechanical robustness and electrical insulation capabilities. However, PMIA-based nanopapers feature a honeycomb porous structure, which can induce localized electric field distortions and mechanical stress concentrations. Here, fluorinated γ-Al2O3 (F-Al2O3) fillers, prepared by fluorination plasma treatment, are incorporated into the PMIA matrix. These fillers occupy the honeycomb cavities and […]
- by Gang Li, Xiaotong Gu, Wei Li and Weitian WangThis study presents a comprehensive investigation into the synergistic effects of trivalent scandium (Sc3+) and pentavalent vanadium (V5+) co-doping on the structural, dielectric, and third-order nonlinear optical properties of titanium dioxide (TiO2). Dense ceramics and high-quality thin films with nominal compositions (Sc0.5V0.5)xTi1−xO2 (x = 0.05–0.20) were fabricated via high-temperature solid-state reaction and pulsed laser deposition, respectively. Phase purity and crystal structure were confirmed by x-ray diffraction, which revealed the formation of rutile-type solid solutions across the compositional range. Complementary x-ray […]
- by Yuzheng Ma, Minxia Shi, Yusen Li, Leran Zhang, Shuai Yuan and Gang LiuHigh performance magnetic shielding is necessary in the fields of high-precision measurement based on quantum sensors such as biological magnetic field. Demagnetization is one of the most prevalent techniques employed to enhance the performance of a magnetically shielded room (MSR). This paper proposes a three-stage demagnetization method based on the quantification of incremental irreversible permeability and the dynamic hysteresis parameter JA(DHP-JA) model. The method is developed from the fundamental perspective of demagnetization theory. First, a quantitative indicator is introduced to […]
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