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A space-time array difference magnetotelluric method is proposed in order to suppress the correlated noise and obtain reliable plane wave impedance data in strong interference region. First, we established a model of electromagnetic prospecting system with multi-input and multi-output. Both natural and man-made electromagnetic field is considered to incidence to earth simultaneously, constitute a...
Laser-induced incandescence (LII) is a non-intrusive method of measuring time-resolved soot particle volume fraction and primary particle sizes. We also can know the component by increasing the laser energy to the regime of laser-induced breakdown spectroscopy (LIBS). More model analysis and experiments should be studied to understand the LII/LIBS.
An improved zero-attracting normalized least mean square (IZA-NLMS) algorithm is proposed for sparse channel estimation. The proposed algorithm is realized by using the error sequence to design the step-size of the sparse-aware normalized least mean square (NLMS) algorithms. Also, the computational complexity reduction strategy is used in the proposed IZA-NLMS algorithm. Computer simulations are constructed...
This paper proposed a high efficient parallel scheme of method of moment (MOM) with RWG basis function to examine the far-field characteristics of electrically large antenna array used for target location. The antenna array is composed of three millimeter-wave conical antennas, which are symmetrically arranged on a spherical surface and geometrically focus on a point far away. Each antenna unit is...
Recently, we have developed the method of broadband Green's function with low wavenumber extraction (BBGFL) to investigate the problem of arbitrary shaped waveguides [1]. In the past, the Boundary Integral-the Resonant Mode Expansion (BIRME) [2, 3] method was applied to calculate the modes of an arbitrary shaped waveguide with a homogenous dielectric. In BIRME, a DC extraction is applied to remove...
Effective thermal management is one of the most important issues for system-level integration technique. In contrast to traditional 2-D integrated system, complicated and multiscale components of the 2.5-D system significantly increase the modeling complexity. What is more, the super-linear relationship between temperature and power consumption further complicates thermal simulation. Among existing...
In this paper, an efficient domain decomposition (DD) technique is introduced into the unconditionally stable finite-difference time-domain (FDTD) method based on weighted Laguerre polynomials (WLPs) for solving the far-field super-resolution focusing of time reversal (TR) waves. The WLP-FDTD method is very suitable for this multiscale problem due to the sub-wavelength array with some special microstructures...
Simulating laser ablation on an atomistic scale is a demanding task which requires millions to billions of atoms for sample sizes in the nano- to micrometer range.
Next generation solar energy converters rely on a combination of principles involving optics, thermodynamics, and device physics. To aid in the experimental design, it is often necessary to develop theoretical and computational models to guide the research. For traditional solar cells, standard computational packages are available; however, for more advanced designs incorporating sub-wavelength optical...
We investigate both optical and electrical properties of organic photovoltaics (OPVs) by a comprehensive multiphysics model.Using a unified finite-difference approach, the multiphysics model for OPVs is established for seamlessly connecting photon absorption to the exciton delocalization and diffusion, and to carrier transport and collection. Here we solve the Maxwell's equations and semiconductor...
Ultrashort laser interactions with dielectrics are numerically investigated by using a multi-physics approach based on Maxwell's equations coupled with a multiple rate free carrier density equation and with the integrated two-temperature model describing the energy transfer from the conduction band electrons to lattice. The model accounts for a complete Keldysh photoionization rate, impact ionization...
Searching for better results, the classic mathematical tools and theorems of dynamic control theory are applied to the analyses of the numeric routine for electrical transients' digital simulations. This numeric routine solves the linear system that represents the π circuits' cascade. So, the differential equations of this system are analyzed using Laplace's transform and, based on these analyses,...
On basis of the principle electromagnetic induction, the connections about initial firing rate of projectile and turns, sectional area and electric current of the coil have been deduced, and then a kind of four stage reluctance electromagnetic launcher is designed. In order to exert pulse current on the coil properly, a photoelectric sensor is installed into coil track. Therefore, the projectile can...
Plasmonics, a technique to tightly concentrate light down to the nanoscaleby coupling photons to surface plasmons,has been employed to downscalelasersto sub-wavelength dimensions. The resultant device is called a spaser, short for surface plasmon amplification by stimulated emission of radiation, or more generally plasmonic nanolaser, which is being explored for applicationsin areas such as sensing...
This paper presents a hybridized discontinuous Galerkin time-domain (DGTD) method with boundary integral equation (BIE) method to accurately solve the electromagnetic scattering problems. The weighted Laguerre polynomials are chosen as temporal entire basis functions to expand the temporal variables, which makes the proposed scheme free from Courant-Friedrichs-Lewy (CFL) condition and promising for...
Polarization cancellation is an effective method to improve the radar target detection performance under the main lobe interference environment. Interference suppression ratio is widely used to assessment polarization filter performance. However, the radar target detection performance is determined by the Signal Interference plus Noise Ratio (SINR). It is important to analyze the polarization filter's...
The work contains feasibility study of independent components analysis (ICA) in bioradar data processing. The method was tested on separation of respiratory and heart beat patterns in bioradar signals. A mathematical model of a bioradar signal reflected from biological objects is presented. Mathematical simulation confirmed that ICA is appropriate if observing a single person for separating vital...
This paper deals with Contactless power transfer of electric energy (CPT) modeled in a FEM specialized software for computing electromagnetical and elektromechanical parameters of electric devices. This software is also available to compute CPT affects on the surrounding electric devices. The first part mentions basic mathematical equations for computing basic CPT parameters. The main part of contactless...
In this work, the nonlinear response from metallic metamaterials is characterized by a finite-difference time-domain solution to the Maxwell-hydrodynamic equations. The spatial locations of E-fields (and electric currents) are interleaved with that of magnetic fields. The electron charge is at the center of Yee grids. The current continuity equation connects Maxwell and hydrodynamic equations. For...
In this paper we analyze mathematical model of the scattering of electromagnetic wave on the electrical inhomogeneities of clouds and precipitation. This model is based on the well-known Mie's approach together with the fact that a charged aerosol particle has semiconducting properties. The analysis of numerical results (with a size distribution for aerosol particles in the form of gamma-distribution)...
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