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This paper presents the electric breakdown arc behavior of micro electrical contact with respect to electric field across contact gap. The breakdown electric field characteristics of Al, Cu, Fe, Ni, and Pt are reported. The 3D plane-plane micro electrical contact has been considered and maximum electric field is analyzed mathematically. Also the considered electrode has been simulated using COMSOL...
Based on metamaterials and transformation optics theory, we develops a method to design 3D invisibility cloak with arbitrary shapes. The proposed electromagnetic invisibility cloak can perfectly hide the target object with arbitrary shapes and materials. Full-wave simulation results demonstrate that 3D electromagnetic invisibility cloaks designed by the proposed method have good performance for hiding...
We investigated ultrafast dynamics of Dirac electrons under a high electric field in graphene combining strong THz pulses and ultrafast transient absorption spectroscopy. Comparison with semi-classical Boltzmann equation clarifies efficient impact ionization process.
In this study, we examined the accumulation mechanism of the space charge in a covering insulating material of motor windings under high voltage based on measurement results of space charge distributions. In these days, the inverter-fed motor drive using pulse width modulation control is applied to many electric devices for industrial machinery, automotive, railway cars and so on. For further improvement...
The development of high voltage devices is a great challenge. At least, railway and smart grids are examples of applications requiring high voltage devices. SiC power devices and technology seem to be mature enough to give a short term solution. Indeed, silicon carbide devices appear to be the semiconductor of choice for high voltage (> 6.5 kV) applications compared to Gallium Nitride. Diamond...
In this paper, the distributions of electric field and electric displacement in a three-layer beam-like piezoelectric harvester are revisited from the accurate piezoelectricity theory. The electric displacement D3 is obtained from the Gauss theorem in electrostatics and found to be uniformly distributed along the thickness direction. The electric field is observed linearly dependent on x3. The efficiency...
Since the artificial materials recently have been widely applied for various applications, such as resonators, filters, transmission lines, and antennas, it is necessary to explore how to extract the properties of materials, i.e. permittivity and permeability. Information about the materials properties is very important for the user before materials utilization. In this paper, a rectangular waveguide-based...
This paper suggests a possible explanation to the geometry-dependence of core loss by solving Maxwell's equations for the flux distribution inside a magnetic conductor carrying eddy currents. The solution reveals a displacement of flux towards the edges of the magnetic sheet. Core loss with and without the displacement effect are compared for the tooth of a highly excited and high-frequency electric...
A dimer is the simplest form of cluster that exhibits some of the salient properties resulting from coupling interactions between the particles. The semiconductor nanodimer is a self-contained nanostructure supporting the intensification of the local electric field as a result of plasmon resonance and proximity effects. By means of a simulation framework based on charge transport analysis for the...
Automatic manipulation and patterning of biological cells into an artificial scaffold is an imperative step in the production of high-quality tissue for tissue transplantation. This paper examines the incorporation of dielectrophoresis into a three-dimensional (3D) scaffold body for batch manipulation and patterning of cells. To facilitate dielectrophoresis-based manipulation, a multi-layer biocompatible...
The operational efficiency of ultra fast actuators used as drives in high voltage direct current breakers are at best 5 %. To boost their efficiency, the design of the energizing circuit is crucial. A multi-physics finite element method (FEM) model coupled with a SPICE circuit model that is able to predict the performance of the actuator with an accuracy of at least 95 % has been developed and verified...
Energy harvesting has been studied with great interest in recent years. Ambient vibration is a potential energy resource for low-power devices or electronic devices in extreme/remote area. Methods on enhance the energy conversion amount has been long been a main subject in energy harvesting field. The present study developed a precise model working under hybrid of electrical and mechanical excitations...
The template grain growth technique was used to synthesis textured 60BiFeO3-PbTiO3(60:40BFPT) by using platelets of BaTiO3 as template. Synchrotron measurement clearly showed textured 60:40BFPT. Moreover, in situ high energy synchrotron radiation was employed to investigate the influence of an external electric filed on crystallographic structure of mixed phase 60:40BFPT. Application of an electric...
PbZr1−x TixO3 (PZT) is an important class of ferroelectrics materials with the ABO3 perovskite-type structure due to their exceptional dielectric and piezoelectric properties. It is well known that PZT ceramics and thin films are sensitive to the level of stress induced by both external elastic and electric fields which fundamentally modifies their physical properties. In order to improve the understanding...
Structure stability of a multiwall carbon nanotube - polystyrene nanocomposite was investigated in two operational modes. Statistical analysis of the emission parameters of the whiskers formed on the anode surface during field emission was carried out. The histograms of the statistical distribution of effective heights at different current levels were plotted. Mass-spectrometry data in alternating...
The mechanical damage evaluation of Z2CN18.12N welding joint with Lamb wave was concerned in this study. The excitation parameters were optimized from the aspects of number of cycles, central excitation frequency, and the electric fields excitation profiles of the piezoelectric transducers. Moreover, the influence of the mechanical clamping was also analyzed. Results show that the enhanced anti-symmetric...
Review of the most recent data on the critical possibilities and mechanisms of field and explosive emission from carbon nanoclusters was provided. It's given information about the latest achievements in the field of portable X-ray devices operating on the basis of these processes.
In this work, a two dimensional (2-D) analytical model and simulation of dual material gate (DMG) Al0.7Ga0.3Sb/InAs High Electron Mobility Transistor (HEMT) has been presented. Superiority of DMG over single material gate (SMG) structure for this kind of HEMTs has been highlighted. Simulation results show the suppression of short channel effects (SCEs) and improvement of carrier transport efficiency...
The model of dynamic characteristics of ferroelectric material is considered. The numerical modeling achieved the satisfactory agreement with experimental data. It has been shown that the maximum of a switching electric current as well as the magnitude which inversely proportional to a switching time increases gradually since some value of external applied voltage. Conditions of an electroluminescence...
This paper presents a novel 30 nm n-channel asymmetric Silicon Germanium-on-Insulator (SGOI) based Tunnel Field Effect transistor using Non-Local Band-to-Band tunneling model that shows the good switching characteristic. Here, we analyzed four different models such as Simple Model, Schenk Model, Hurkx Model and Non-Local Model. Germanium is used as the source because of low band gap material and Silicon...
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