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[IEEE 2018 28th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) - Greifswald (2018.9.23-2018.9.28)] 2018 28th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) - A Novel Vacuum Interruption Contact Design for High Current DC Vacuum Circuit Breaker
摘要： The vacuum interruption contact structure affect the insulation and breaking performance of DC vacuum circuit breaker directly. A novel vacuum interruption contact system with axial magnetic field (AMF)-double transversal magnetic field (TMF) is investigated for high current interruption in DC vacuum circuit breaker in this paper. It consists of one AMF cup-shaped contact and two concentric TMF contacts, which the internal contact is a disk-shaped structure and the external contact is a cup-shaped structure. The so-called novel TMF-TMF-AMF contact structure has the merits of having a very high axial magnetic flux density at large current condition, and producing rotation Lorentz force for metal vapor arc caused during interruption process. Its performance is compared with that of traditional TMF contact, traditional AMF contact and TMF-AMF contacts using three-dimensional finite-element method and the comparison results verify the validity of this proposed interruption contact structure design.
关键词： Lorentz force,vacuum interruption,finite element method,Axial magnetic flux density,metal vapor arc
更新于2025-09-23 15:23:52
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Stable Fano-like plasmonic resonance: its impact on the reversal of far- and near-field optical binding force
摘要： Even for a 100 nm interparticle distance or a small change in particle shape, optical Fano-like plasmonic resonance mode usually vanishes completely. It would be remarkable if stable Fano-like resonance could somehow be achieved in distinctly shaped nanoparticles for more than 1 μm interparticle distance, which corresponds to the far electromagnetic field region. If such far-field Fano-like plasmonic resonance can be achieved, controlling the reversal of the far-field binding force can be attained, like the currently reported reversals for near-field cases. In this work, we have proposed an optical set-up to achieve such a robust and stable Fano-like plasmonic resonance, and comparatively studied its remarkable impact on controlling the reversal of near- and far-field optical binding forces. In our proposed set-up, the distinctly shaped plasmonic tetramers are half immersed (i.e. air–benzene) in an inhomogeneous dielectric interface and illuminated by circular polarized light. We have demonstrated significant differences between near- and far-field optical binding forces along with the Lorentz force field, which partially depends on the object’s shape. A clear connection is shown between the far-field binding force and the resonant modes, along with a generic mechanism to achieve controllable Fano-like plasmonic resonance and the reversal of the optical binding force in both far- and near-field configurations.
关键词： Fano resonance,plasmonic,optical binding force,tetramer,Lorentz force
更新于2025-09-23 15:21:01
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Arrhenius Activation Energy Impact in Binary Chemically Reactive Flow of TiO2-Cu- H2O Hybrid Nanomaterial
摘要： Main motivation of the present research article is to investigate impact of Arrhenius activation energy in stagnation point flow of hybrid nanomaterial towards a stretched surface. Hybrid nanomaterial comprises of two or more types of nanomaterials along with continuous phase liquid. In this study two types of nanofluids are used namely titanium dioxide and copper. Nonlinear system is converted to ordinary system through appropriate transformation. For convergence series solutions, the obtained system is solved using homotopy analysis methods. Lorentz force impact is observed. Graphical results for different physical variables on the velocity, concentration, induced magnetic field and temperature for ???? ? ??2?? and ??????2 ? ????/??2?? are discussed. The physical aspects of skin friction and Sherwood and Nusselt numbers are discussed by tabulated values.
关键词： viscous dissipation,lorentz force,hybrid nanofluid,activation energy,chemical reaction,nonlinear radiation
更新于2025-09-23 15:21:01
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PRECISE FINITE DIFFERENCE ANALYSIS OF LORENTZ FORCE ACTING ON METAL NANOPARTICLE IRRADIATED WITH LIGHT
摘要： A ?nite di?erence method in the frequency domain is evaluated to clarify characteristics of the Lorentz force exerted on a metal nanoscale particle by light irradiation. Numerical results are compared with exact values obtained from Mie theory to show that applying a smoothing algorithm to the surface of a nanoparticle increases the accuracy of the simulation. Analysis of the Lorentz force exerted between two spheres aligned closely indicates that strong forces cause the spheres to attract each other at the plasmon resonant frequency. It was also noticed that application of the smoothing algorithm was indispensable in order to achieve the above result.
关键词： plasmon resonance,finite difference method,Lorentz force,light irradiation,metal nanoparticle,Mie theory
更新于2025-09-23 15:21:01
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Use of Magnetic Fields for Surface Modification of PbI2 Layers to Increase the Performance of Hybrid Perovskite Solar Cells
摘要： Hybrid perovskite ?lms are prepared via two-step spin coating. The impact of magnetic ?elds during the spin coating of the PbI2 precursor solution is assessed with atomic force microscopy and scanning electron microscopy of the obtained layers. Deeper and narrower peak–valley–peak formations are obtained in PbI2 ?lms when the magnetic ?eld applied and the spinning direction result in a Lorentz force that pushes the [PbI6]4? ions towards the inner area of the substrate. This produces rougher and more porous PbI2 ?lms with an increased surface area that facilitates the in?ltration of the methylammonium iodide and chloride precursor solution, thereby enhancing the formation of perovskite. Increased cell performance and more repeatable results are obtained when the PbI2 ?lm is spin-coated under the in?uence of a negative magnetic ?eld. Opposite effects are obtained when the direction of the magnetic ?eld, and therefore the Lorentz force, is inverted. This demonstrates that a magnetic ?eld can be used to modify the surface morphology of spin-coated thin ?lms prepared from ionic precursor solutions.
关键词： solar cells,Hybrid perovskite,assisted deposition,magnetic field,Lorentz force
更新于2025-09-23 15:19:57
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Laser polishing of tool steel using a continuous-wave laser assisted by a steady magnetic field
摘要： Continuous-wave (CW) lasers are widely used in laser polishing, but with CW laser polishing, it is difficult to reduce the surface roughness to 0.2 μm from an original value exceeding 1.0 μm. The aim of this study is to develop an innovative method of laser polishing assisted by a steady magnetic field to overcome that bottleneck and produce smoother surfaces. Two experiments confirm the hypothesis that the molten pool overflows during melting peaks to flow into valleys in CW laser polishing, resulting in secondary roughness that causes the aforementioned quality bottleneck. To either reduce or eliminate this secondary roughness, a steady magnetic field is used during CW laser polishing to suppress the overflow of the molten pool. A three-dimensional surface profiler, a scanning electron microscope, and a nanometer indentation tester are used to characterize and analyze the microstructure and properties of the materials. The experimental results show that the Lorentz force due to the steady magnetic field plays an important suppression role in reducing the secondary roughness.
关键词： laser polishing,steady magnetic field,Lorentz force,molten pool overflow,continuous-wave laser,surface roughness
更新于2025-09-19 17:13:59
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[IEEE 2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP) - Auckland (2018.8.5-2018.8.8)] 2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP) - Microrobot propulsion force generation using semiconductor based wireless power transfer coils
摘要： Currently, various kinds of biomedical microrobots have been proposed for medical and industrial applications. In order to maximize the utilization of microrobots, a method of supplying electrical energy by wireless power transfer has been proposed. Nevertheless, one of the critical issues of microrobot is miniaturization. In this paper, we successfully demonstrated 2.6 mm sized microrobot using wireless power transfer system to produce the propulsion force and transfer electric power simultaneously. A micro robot with several millimeters was fabricated using a semiconductor process, which was used in experiments. A 2.6 mm×2.6 mm sized spiral coil microrobot have been successfully demonstrated with 2.1 mm/s.
关键词： microrobot,Lorentz force,wireless power transfer,phase control,propulsion
更新于2025-09-09 09:28:46
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Holographic interferometric microscopy for measuring Cu2+ concentration profile during Cu electrodeposition in a magnetic field
摘要： We measured the concentration boundary layer during copper electrodeposition in a copper sulfate solution under an applied magnetic field. Using a holographic laser interference microscope, we demonstrated the formation of the diffusion layer near the cathode. In the initial stage of electrodeposition, the diffusion layer was distorted in a magnetic field. An analysis of the electrode surface concentration supported the following assertions: without a magnetic field, dendrites formed when the surface concentration of Cu2+ was depleted; with a magnetic field, the unique convection phenomena of the field gradient force and localized Lorentz force promoted Cu2+ mass transport in the diffusion layer, producing large crystal grains.
关键词： Diffusion layer,Magnetohydrodynamic,Magnetic field,Localized Lorentz force,Field gradient force
更新于2025-09-04 15:30:14