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检索条件"主题词=Finite-Difference Time-Domain Method"

共 1147 条记录，以下是451-460 订阅

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FDTD Computation of Lightning Currents in a Multilayer CFRP Panel with a Conductivity Matrix Approach 60

FDTD Computation of Lightning Currents in a Multilayer CFRP ...

引用

Joint 60th IEEE International Symposium on Electromagnetic Compatibility (EMC) / IEEE Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC)

作者： Ueno, Koki Umeda, Teruo Baba, Yoshihiro Tsubata, Hiroyuki Nishi, Takayuki Doshisha Univ Kyotanabe Kyoto 6100321 Japan SUBARU Corp Utsunomiya Tochigi 3208564 Japan

ISBN: (纸本)9781509059973

The transient distribution of lightning current, which flows in a multilayer carbon-fiber-reinforced plastic (CFRP) material of aircraft, has been studied using the finite difference time-domain (FDTD) method. Each layer of the multilayer CFRP panel has a fiber direction of 45, 90, 45 or 0, and, therefore, has an anisotropic conductivity. It is quite difficult to represent such an anisotropic layered panel using the FDTD method with common rectangular prism or cubic cells. In this paper, the distribution of lightning currents on a 3-mm-thick multilayer CFRP panel, composed of 16 layers, is computed using the FDTD method with a conductivity matrix approach.

关键词： Carbon fiber reinforced plastics finite-difference time-domain method lightning conductivity matrix approach

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On-chip Photonic Particle Sensor 16

On-chip Photonic Particle Sensor

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Conference on Microfluidics, BioMEMS, and Medical Microsystems XVI

作者： Singh, Robin Ma, Danhao Agarwal, Anu Anthony, Brian MIT Inst Med Engn & Sci Dept Mech Engn Cambridge MA 02139 USA MIT Microphoton Ctr Dept Mat Sci & Engn Cambridge MA 02139 USA

ISBN: (数字)9781510614680

ISBN: (纸本)9781510614680

We propose an on-chip photonic particle sensor design that can perform particle sizing and counting for various environmental applications. The sensor is based on micro photonic ring resonators that are able to detect the presence of the free space particles through the interaction with their evanescent electric field tail. The sensor can characterize a wide range of the particle size ranging from a few nano meters to micron (similar to 1 micron). The photonic platform offers high sensitivity, compactness, fast response of the device. Further, FDTD simulations are performed to analyze different particle-light interactions. Such a compact and portable platform, packaged with integrated photonic circuit provides a useful sensing modality in space shuttle and environmental applications.

关键词： Particles Resonators Sensors Waveguides Atmospheric particles Photodetectors Aerosols Atmospheric modeling finite-difference time-domain method Light scattering

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Numerical Simulation of EMP Environment Radiated by X-rays inside a High-Power Laser Facility

Numerical Simulation of EMP Environment Radiated by X-rays i...

引用

International Applied Computational Electromagnetics Society Symposium (ACES)

作者： Xu, Zhiqian Meng, Cui Tsinghua Univ Dept Engn Phys Beijing Peoples R China

In high-power laser facility, X-rays could generate very strong system-generated electromagnetic pulse (SGEMP). There are two types of SGEMP response and they are both studied through the numerical simulation.

ISBN: (纸本)9780996007870

关键词： finite-difference time-domain method Monte Carlo method PIC particle simulation SGEMP X-rays

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3D simulation for scatter light distribution of optical surface defects 12

3D simulation for scatter light distribution of optical surf...

引用

Conference on Optical Manufacturing and Testing XII

作者： Chai, Huiting Zhang, Pengfei Yang, Yongying Bai, Jian Zhang, Yihui Zhejiang Univ Coll Opt Sci & Engn State Key Lab Modern Opt Instrumentat Hangzhou 310027 Zhejiang Peoples R China

ISBN: (数字)9781510620568

ISBN: (纸本)9781510620568

Surface defects evaluation system (SDES) works on the principle of microscopic scattering dark-field imaging (MS-DFI) and takes the criterion board as reference for calibration. Unfortunately, for criterion board with rectangular section scribed lines, image width of narrow lines doesn't follow the linear law, making it confusing to get real width. Besides, other criterion board except with rectangular section scribed lines in a flat plane is difficult to fabricate, which limits measurement accuracy and extensive use of SDES. In this paper, a 3D simulation model is established to simulate scatter light distribution induced by surface defects. The interactions between the incident light and surface defects in near field is calculated with the help of finite-difference time-domain (FDTD) method, a kind of Maxwell's solver. Skills as rotation and incoherent summation are applied to obtain results under illumination of unpolarized, broad-spectrum natural light sources in uniform annular layout. Finally, near to far field projections based on vector diffraction theory is carried out to get scatter light intensity distribution in far field. The data is also post-processed by scripts to describe imaging process simplified by a lens system so that it can be compared to experiment images. The 3D simulation model reveals MS-DFI process theoretically and may help to interpret image width of surface defects. The establishment of the 3D imaging model is an attempt to overcome the limits of the criterion board and is expected to provide reference for calibration for wider applications of SDES.

关键词： Surface defects microscopic scattering dark-field imaging finite-difference time-domain method scatter light intensity distribution 3D electromagnetic simulation model measurement

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Nano-structured GaAs Solar Cell Design, Simulation and Analysis for Conversion Efficiency Improvement

Nano-structured GaAs Solar Cell Design, Simulation and Analy...

引用

Australasian Universities Power Engineering Conference (AUPEC)

作者： Tan, Shiyao Das, Narottam Helwig, Andreas Islam, Syed Univ Southern Queensland Sch Mech & Elect Engn Toowoomba Qld 4350 Australia Cent Queensland Univ Sch Engn & Technol Melbourne Vic 3000 Australia Curtin Univ Dept Elect & Comp Engn Perth WA Australia Federat Univ Sch Sci Engn & Informat Technol Ballarat Vic 3353 Australia

ISBN: (纸本)9781538684740

This paper discusses nano-structured GaAs solar cell design and analysis for conversion efficiency improvement by increasing the light transmission and absorption, reducing the light reflection. The focus of this research is to construct different type of nano-grating shaped GaAs solar cells with various nano-grating heights and pitches, to compare the simulation results and find a suitable nano-structure that can provide higher conversion efficiency. finite difference time domain ( FDTD) simulation tool is used to simulate and calculate the light reflection, transmission and absorption for different nano-grating shapes, such as, parabolic, triangular, trapezoidal and rectangular. Based on the simulation results, it has been confirmed that the light reflection of parabolic shaped nano-grating structures is higher than triangular nano-grating structures, but it is lower than rectangular and trapezoidal shaped nano-grating structures. Moreover, the simulation results confirmed that the light transmission of parabolic shaped nano-grating structures is about 62.3% having a 200-nm grating height and an 810-nm grating pitch, which is about 22% higher than the rectangular ( i. e., flat) type substrates.

关键词： Conversion efficiency finite-difference time-domain method GaAs solar cells Light reflection transmission and absorption Nano-grating structure Solar or renewable energy

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Theoretical and experimental investigations of photonic jet array from rectangle phase diffraction grating

Theoretical and experimental investigations of photonic jet ...

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Optical Manipulation Conference

作者： Liu, Cheng-Yang Yen, Tzu-Ping Minin, Oleg V. Minin, Igor V. Tamkang Univ Dept Mech & Electromech Engn New Taipei Taiwan Siberian State Univ Geosyst & Technol Novosibirsk Russia

ISBN: (数字)9781510619821

ISBN: (纸本)9781510619821

The generations of photonic jet array using rectangle phase diffraction grating at visible light region are demonstrated numerically and experimentally for the first time. The power flow patterns for the rectangle diffraction grating are simulated by using the finite-difference time-domain method. In experiment, the rectangle phase diffraction grating was fabricated with polydimethylsiloxane material. The direct imaging of the spatial and amplitude features for the grating-assisted photonic jet array is performed with a scanning optical microscope system. The focusing qualities of photonic jet array are evaluated in terms of focal length and transversal width along propagation and transversal directions. The photonic jet array could be operated in a wide range application for nanotechnology, self-assembly, energy generation and storage materials through the rectangle phase diffraction grating.

关键词： photonic jet diffraction grating subwavelength imaging focusing finite-difference time-domain method

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Circular-Shaped Uniaxial Perfectly Matched Layer for the FDTD method in Cartesian System

Circular-Shaped Uniaxial Perfectly Matched Layer for the FDT...

引用

International Applied-Computational-Electromagnetics-Society Symposium - China (ACES)

作者： Wang, Lu Zheng, Hong-Xing Hebei Univ Technol Sch Elect & Informat Engn Xiping Rd 5340 Tianjin 300401 Peoples R China

ISBN: (纸本)9780996007849

To reduce unnecessary lattices work of the FDTD method in the traditional Cartesian coordinate system, circular-shaped uniaxial perfectly matched layer strategy is introduced, which can omit four corner regions calculations in the two-dimensional situation, so that the calculation efficiency can be improved and the simulation time can be saved to some extent, compared to the conventional method. Two numerical experiments are simulated to verify the stability and efficiency of the proposed strategy.

关键词： circular-shaped uniaxial perfectly matched layer finite-difference time-domain method Cartesian system

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A hybrid method for scattering by multiple bodies

A hybrid method for scattering by multiple bodies

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Conference on Metamaterials, Metadevices, and Metasystems

作者： Gourdin, Anthony Genevet, Patrice Felbacq, Didier Univ Montpellier L2C CNRS F-34095 Montpellier France SAFRAN Elect & Def Paris France Univ Cote Azur CNRS CRHEA Valbonne France

ISBN: (纸本)9781510620100

We present a numerical methods that allows to compute the field scattered by a collection of resonant elements. It is a hybrid scheme based on one part on a variant of the DDA to deal with a single scatterer, associated with a multiple scattering theory based on Calderon projectors and the method of fictitious sources. This allows to deal efficiency with aperiodic set of scatterers not disposed arbitrary in space.

关键词： Multiple scattering Scattering Defense and security Electronics Numerical analysis Projection systems finite element methods finite-difference time-domain method Homogenization Metamaterials

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Estimation of the Parameters of Cold Unmagnetized Plasma Media Based on time-domain Inverse Scattering Technique

Estimation of the Parameters of Cold Unmagnetized Plasma Med...

引用

International Applied-Computational-Electromagnetics-Society Symposium - China (ACES)

作者： Feng, Xuejian Deng, Haochuan Wei, Xiao Yin, Hongcheng Sci & Technol Electromagnet Scattering Lab Beijing 100089 Peoples R China Commun Univ China Dept Informat Engn Beijing 100024 Peoples R China

ISBN: (纸本)9780996007849

In this paper, a time-domain inverse scattering technique for estimating the resonance frequency of 2-D cold un magnetized plasma scatters is proposed. The resonance frequency properties of the unknown plasma region are estimated by post processing scattering-field measurements, which are obtained when the domain of reconstructing region is illuminated by time harmonic source. The plasma scatters parameters are reconstructed by applying a global optimization technique, which combines the finite-difference time-domain (FDTD) method and the particle swarm optimization (PSO) algorithm. During the inversion, the resonance frequency parameters of the unknown region are expanded by a cosine Fourier series. The numerical results illuminate that the proposed method with well reconstruction accuracy and anti ill-posedness characteristics.

关键词： finite-difference time-domain method particle swarm optimization Fourier series expansion plasma

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Brightness Temperature from Very Lossy Medium

Brightness Temperature from Very Lossy Medium

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IEEE-Antennas-and-Propagation-Society International Symposium on Antennas and Propagation / USNC/URSI National Radio Science Meeting

作者： Lai, Zhi-Hong Kiang, Jean-Fu Natl Taiwan Univ Grad Inst Commun Engn Taipei Taiwan

The brightness temperature from moistured soil with a flat surface is computed by defining near-field bistatic transmission coefficients (BTCs) and modifying the Planck's law for lossy medium. The efficacy of the ... 详细信息

ISBN: (纸本)9781538671054

关键词： brightness temperature moistured soil bistatic transmission coefficient finite-difference time-domain method

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