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- electromagnetic pulse
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- Southern University of Science and Technology
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- ELI-ALPS, ELI-HU Non-Profit Ltd.
- V.N. Karazin Kharkiv National University
- Politecnico di Torino
- Centro de laseres pulsados and University of Salamanca
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Unique electromagnetic loss properties of Co-doped ZnO Nanofiber
摘要： In this paper, Co-doped ZnO nanoparticle and nano?ber are prepared by electrospinning method. The results show that Co-doped ZnO nano?ber performs bead-like ?brous shape and exhibits ferromagnetic properties. The dielectric loss and magnetic loss properties of Co-doped ZnO nano?ber are much better than those of Co-doped ZnO nanoparticle due to the improvement of dipole polarization, interfacial polarization and shape anisotropy. The absorptivity of Co-doped ZnO nano?ber can reach 70% in the frequency range of 5.3–18 GHz when the coating thickness is 1.5–4.0 mm. It is demonstrated that the bead-like ?brous shape is bene?cial to optimize electromagnetic loss and microwave absorption properties of Co-doped ZnO.
关键词： Electronic materials,Electromagnetic loss,Magnetic materials,Zinc oxide
更新于2025-09-23 15:23:52
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[IEEE 2018 IEEE International Conference on Signal Processing, Communications and Computing (ICSPCC) - Qingdao, China (2018.9.14-2018.9.16)] 2018 IEEE International Conference on Signal Processing, Communications and Computing (ICSPCC) - A Low-Profile Differentially Feeding Dual-Polarized Antenna Using Wideband AMC Reflector
摘要： In this paper, we presented a novel low-profile differentially feeding dual-polarized antenna adopting wideband artificial magnetic conductor (AMC) reflector for the fifth generation (5G) base-station communications. There are some winding inductors arranged at both ends of the cross slots, which result in a small-size radiating patch as well as a wide bandwidth. Both impedance bandwidths of 47.3% (3.28-5.31 GHz) and 47.2% (3.29-5.32 GHz) can be achieved for Ports I and II, respectively. Due to differentially feeding scheme, a high port isolation of below -40 dB during the working frequency band is obtained. In addition, thanks to the AMC structure, the profile of proposed antenna can be reduced from 18 to 9.5 mm (0.13λc, λc is the free-space wavelength at the center frequency).
关键词： differentially feeding antenna,artificial magnetic conductor,Dual-polarized antenna
更新于2025-09-23 15:23:52
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Magneto-optical imaging characteristics of weld defects under alternating and rotating magnetic field excitation
摘要： This paper mainly examines the characteristics of magneto-optical (MO) images of weld defects under alternating and rotating magnetic field excitation. Weld defects including surface and subsurface defects were subjected to magneto-optical imaging (MOI) nondestructive testing (NDT) experiments. The MO images of different weld defects under alternating magnetic field excitation and rotating magnetic field excitation have been compared to determine the best effect of nondestructive testing, and a cruciform welding seam was used to verify the detection effect of rotating magnetic field. Besides, the values of standard deviation and maximum difference have been determined to analyze the difference in the effects of two magnetic fields, and image processing methods were applied to extract defect information, such as histogram equalization. Experimental results show that the optimal excitation voltage and lift-off value of rotating magnetic field are 120 V and 20 mm, respectively; image histogram equalization can significantly improve the contrast of MO images, and there is a distinct difference in the detection effect of two magnetic fields. Under the same excitation conditions, the detection effect of rotating magnetic fields is always better than the effect of alternating magnetic fields, and rotating magnetic field excitation has obvious advantages in detecting multidirection and subsurface defects in that the detection depth can reach about 8 mm.
关键词： Magneto-optical imaging,Electromagnetic optics,Nondestructive testing,Rotating magnetic field
更新于2025-09-23 15:23:52
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Structural, optical and magnetic elucidation of co-doped of Nd+3 and Pr+3 on lithium nanoferrites and its technological application
摘要： LiNiCo spinel ferrites were prepared, by doping with rare earth metals Nd and Pr, according to micro-emulsion method. In order to study the effect of Nd and Pr, the crystal structure and magnetic properties of prepared ferrites were scrutinized in detail. The endorsement of single-phase spinel ferrites with the co-occurrence of orthophase was confirmed by XRD and FTIR. The average crystallite size varied with increasing the doped concentration of Nd and Pr, which is in the range from 28nm to 70nm. Magnetic properties were analyzed by VSM within range of -10000Oe and 10000Oe. MS and MR values decreased with the increase in concentration. The value of HC, MR, and MS showed stability for transformer core where electromagnetic interference is reduced. Hence synthesized ferrites LiNi0.35-yCo0.15PryNdxFe2-xO4 are suitable for transformers and induction.
关键词： Microemulsion,XRD,Li-Pr,Neodymium,Nanocrystalline ferrites,Praseodymium,Magnetic properties
更新于2025-09-23 15:23:52
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[IEEE 2018 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW) - Montréal, QC, Canada (2018.6.3-2018.6.7)] 2018 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (Wow) - An Elliptical Magnetic Field-Orientated Control for Interoperability and Misalignment Tolerance in Inductive Power Transfer
摘要： To improve the interoperability and misalignment tolerance of the inductive power transfer (IPT) system, the concepts of circular rotating magnetic field control and elliptical rotating field orientated control(FOC) are proposed in this paper. The method of analogy analysis between LIM (liner inductive motor) and IPT is adopted to improve the magnetic field distribution characteristics. Detailed output voltage derivation of circular pads and DD pads under misalignment are given. An approximate calculation model is built to study the influence of end effect and gap variation on magnetic field distribution. Experimental results verify the laws of circular magnetic field and elliptical magnetic field.
关键词： misalignment,magnetic field-orientated control,analogy analysis,wireless power transfer,interoperability,inductive power transfer(IPT)
更新于2025-09-23 15:23:52
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Ultrasensitive and simultaneous detection of two cytokines secreted by single cell in microfluidic droplets via magnetic-field amplified SERS
摘要： A surface-enhanced Raman scattering (SERS)-microfluidic droplet platform for the rapid, ultrasensitive and simultaneous detection of vascular endothelial growth factor (VEGF) and interleukin-8 (IL-8) secreted by a single cell is presented. The high throughput water-in-oil droplets containing individual cell along with four kinds of immune-particles (antibody-conjugated silver nanoparticles or magnetic beads, AgNPs@Ab1 and MNs@Ab2) in each were achieved by a cross-typed microfluidic chip, and then they were captured by a collection channel array for SERS measurements. In the appearance of cytokines secreted by one cell, AgNPs@Ab1 can be linked onto the surface of MNs@Ab2 through the immune-recognition to form an immune-sandwich, which makes the 'turn on' SERS signal of the Raman reporters previously laid on the surface of MNs due to the adjacent AgNPs. Furthermore, the second SERS signal amplification is from the magnetic field-induced spontaneous collection effect, which brings 75 times enhancement for SERS signal. Additionally, the encapsulation of cytokines in an isolated droplet permits an accumulation effect of targets with time. Owing to the dual signal enhancement and the accumulation effect, such few cytokines secreted by single cell become detectable and a limit of detection is achieved as 1.0 fg/mL in one droplet. By using this ultrasensitive SERS-microdroplet method, the VEGF and IL-8 secretions from several cells in one droplet were explored and the data show that the cell–cell interactions may promote angiogenesis of cancer cells through the up-regulation of VEGF and IL-8.
关键词： surface-enhanced Raman scattering,VEGF,magnetic field amplification,single-cell analysis,IL-8,cytokines,microfluidic droplets
更新于2025-09-23 15:23:52
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Optical and Magnetic Properties of Cobalt Ions Doped Calcium Phosphate by Ultrasonication
摘要： Background: Hydroxyapatite (HAp) is a remarkable member of the calcium phosphate family. It resembles natural bone in both structure and chemical composition. Owing to its bioactive and chemical properties, it has been used as a biocompatible osteogenesis and energy materials as discussed in patents. Objective: To study the structural, optical properties and magnetic properties of hydroxyapatite and cobalt ions doped hydroxyapatite for biomedical application. Method: Hydroxyapatite and cobalt ions doped hydroxyapatite were synthesized by ultrasonication assisted wet chemical synthesis. Results: X-ray diffraction analysis confirmed the phase and crystallite size of hydroxyapatite. There was a 12% decrease in crystallite size compared to pristine. The functional groups and vibrational assignments of the samples were observed in infra-red and Raman spectra. Optical properties of the samples were analyzed by Diffuse Reflectance Spectroscopy, ultraviolet-visible and photoluminescence emission spectroscopy. Doped samples showed paramagnetic in nature. Conclusion: Therefore, the cobalt doped samples could be employed in biomedical applications.
关键词： optical,luminescence,hyperthermia,bioceramics,Cobalt ions,magnetic,hydroxyapatite
更新于2025-09-23 15:23:52
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Angular-Dependent Spontaneous Emission in Cholesteric Liquid Crystal Films
摘要： Due to the presence of a selective reflection band, cholesteric liquid crystals (CLCs) strongly modify the emission of fluorescent guest molecules. While emission along the helical axis is well understood, the emission properties at oblique angles with respect to the cholesteric helix have so far have not been explored in detail. We present a systematic study of the angular-dependent spontaneous emission properties of dye-doped cholesteric films, including a full Stokes analysis of the emitted light. Variation of the cholesteric pitch allows us to probe the effect of the photonic band structure on spontaneous emission in a wide angular range. We find exceptional angular-dependent intensity and polarization variations of the emitted light, and give experimental proof for the splitting of the first-order reflection band as well as its overlap with the second-order band at large detection angles.
关键词： and Hybrid Materials,Optical,Cholesteric Liquid Crystal,Stokes Analysis,Angular-Dependent,Plasmonics,Spontaneous Emission,Magnetic
更新于2025-09-23 15:23:52
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Effect of Co component in Co-Ag granular thin films on visible-light reflection applied by magnetic field
摘要： The reflection of visible light (wavelength from 350 to 800 nm) on magnetic granular thin films Cox-Ag1-x with x from 0 to 35 at % was studied. Dependence of reflection (R) is strong on magnetic and percentage of Co in the thin films, R strongly increase in wavelengths 560 and 660 nm. In this paper, some arguments relating to the spin-plasmon phenomenon were used to explain the results.
关键词： spin-plasmon,Granular magnetic thin films,visible light,reflection
更新于2025-09-23 15:23:52
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Resonance Coupling in Heterostructures Composed of Silicon Nanosphere and Monolayer WS <sub/>2</sub> : A Magnetic-Dipole-Mediated Energy Transfer Process
摘要： Light?matter resonance coupling is a long-studied topic for both fundamental research and photonic and optoelectronic applications. Here we investigated the resonance coupling between the magnetic dipole mode of a dielectric nanosphere and 2D excitons in a monolayer semiconductor. By coating an individual silicon nanosphere with a monolayer of WS2, we theoretically demonstrated that, because of the strong energy transfer between the magnetic dipole mode of the nanosphere and the A-exciton in WS2, resonance coupling evidenced by anticrossing behavior in the scattering energy diagram was observed, with a mode splitting of 43 meV. In contrast to plexcitons, which involve plasmonic nanocavities, the resonance coupling in this all-dielectric heterostructure was insensitive to the spacing between the silicon nanosphere core and the WS2 shell. Additionally, the two split modes exhibited distinct light-scattering directionality. We further experimentally demonstrated the resonance coupling effect by depositing silicon nanospheres with different diameters onto a WS2 monolayer and collecting the scattering spectra of the resulting heterostructures under ambient conditions. We further demonstrated active control of the resonance coupling by temperature scanning. Our findings highlighted the potential of our all-dielectric heterostructure as a solid platform for studying strong light?matter interactions at the nanoscale.
关键词： magnetic dipole modes,two-dimensional materials,resonance coupling,two-dimension excitons,silicon nanospheres
更新于2025-09-23 15:23:52