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检索条件"机构=National Key Laboratory of Science and Technology on Test Physics and umerical Mathematics"

共 319 条记录，以下是61-70 订阅

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Spatial diffusion model and simulation analysis of the heterogeneous un-magnetized jet plasma 45

Spatial diffusion model and simulation analysis of the heter...

引用

45th EPS Conference on Plasma physics, EPS 2018

作者： Wu, Runhui Liu, Jiaqi Meng, Gang Chai, Song Liu, Xin Ren, Aimin Yan, Feng Beijing Institute of Space Long March Vehicle National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing100076 China

ISBN: (纸本)9781510868441

In this paper, the spatial distribution characteristics of electron density are calculated based on the plasma jet diffusion model. The computed results are compared with the results of numerical calculation, validation test results. Researches of the paper are demonstrated that the plasma electron density is attenuated as the approximate exponential with increasing distance from the nozzle exit, the closer distance from the nozzle exit, the greater the attenuation slope, on the far away from the nozzle exit, the electron density attenuation with distance is the flat state. This method is simple and efficient, and it is a good tool to solve engineering calculation problems. © Copyright (2018) by European Physical Society (EPS) All rights reserved.

关键词： Plasma jets

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Study on 2D Plasma Photonic Crystals with Defect Modes Using FDTD Method

Study on 2D Plasma Photonic Crystals with Defect Modes Using...

引用

2022 International Applied Computational Electromagnetics Society Symposium, ACES-China 2022

作者： Song, Hang Zhang, Yuning Liu, Jiaqi Ai, Lihong Zhang, Shengiun National Key Laboratory of Science & Technology on Test Physics and Numerical Mathematics Beijing China Captial Aerospace Machinery Coporation Limited Beijing China

ISBN: (纸本)9781665452366

In this paper, a typical uniform unmagnetized two-dimensional plasma photonic crystal with a single linear defect mode is simulated based on the finite difference time domain method, and the effects of defect mode position and size on its photonic band gaps characteristics are explored respectively. the research can provide an idea for tuning the electromagnetic properties of two-dimensional plasma photonic crystals. © 2022 IEEE.

关键词： Finite difference time domain method

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Influence of particle size distribution on the radiation characteristics of SiC particle swarm 9

Influence of particle size distribution on the radiation cha...

引用

9th Symposium on Novel Photoelectronic Detection technology and Applications

作者： Yanan, Li Xia, Ai Lu, Gao Shikui, Dong Beijing University of Technology Beijing China National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics Beijing China Harbin Institute of Technology Harbin China

ISBN: (纸本)9781510664432

Based on electromagnetic scattering mechanism, Mie scattering theory and Monte Carlo method are used to analyze the radiation characteristics of SiC particle swarm with different distribution forms in this paper. The study find that the form of particle size distribution has a significant impact on the spectral transmittance of particle swarms. The proportion of particles of different sizes in the particle size distribution, the dispersion of particle size distribution, and the span of particle size scale all affect the infrared extinction performance of particle swarms in varying degrees. Among them, the proportion of particles of specific size in the particle size distribution is the most one, which is a necessary factor to ensure the existence and amplitude of particle characteristic spectra. The relationship between particle size distribution and radiation characteristics was deeply analyzed, and the results showed that increasing the proportion of particles within the 0.16~2.5µm particle size range of SiC particle can comprehensively improve the extinction performance of SiC particle swarm, which is of practical significance for optimizing the infrared radiation performance of particle swarms. © 2023 SPIE.

关键词： Particle size analysis

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A Physical Layer key Generation method with Reliable Negotiation

A Physical Layer Key Generation method with Reliable Negotia...

引用

2019 IEEE International Conference on Signal, Information and Data Processing, ICSIDP 2019

作者： Wang, Yuchen Wu, Xuanli Xu, Zhicong Wu, Wei Li, Hu Zhang, Ran School of Electronics and Information Engineering Harbin Institude of Technology Harbin China National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing China

ISBN: (纸本)9781728123455

There is a risk of information leakage in the process of wireless communication. The introduction of key generation in the physical layer can effectively improve the security of wireless communication. This paper proposes a new physical layer key generation method in the TDD (time division duplex) communication system. Assume that the uplink and downlink channels are reciprocal. Through LDPC (Low Density Parity Check)channel coding and negotiation algorithm, the inconsistency rate of key generation between Alice and Bob is reduced. Simulation and analysis results show that the method improves the key generation rate and reduces the key inconsistency rate. © 2019 IEEE.

关键词： Hash functions

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Influence of clusters on radiation properties of Si3N4particles

Influence of clusters on radiation properties of Si3N4partic...

引用

2022 International Applied Computational Electromagnetics Society Symposium, ACES-China 2022

作者： Li, Yanan Wang, Qun Dong, Shikui Cui, Yichun Gao, Lu Ai, Xia Beijing University of Technology Beijing China National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics Beijing China Harbin Institute of Technology Harbin China

ISBN: (纸本)9781665452366

We analyze the radiation characteristics of Si3N4 elementary particles based on Mie theory, and Si3N4 cluster particles by GMM theory. The results show that the larger the Si3N4 cluster particles, the larger the extinction factor and scattering factor, which variation trend is similar to that of the elementary particles with the same scale, and the position of the scattering peak is also similar to that of the elementary particles. The influence of cluster particles on the amplitude of absorption factor is relatively small, but some absorption characteristic peaks disappear, which is very different from the elementary particles with the same scale. © 2022 IEEE.

关键词： Silicon compounds

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Analysis of infrared radiation properties of SiC particles with different microstructures

Analysis of infrared radiation properties of SiC particles w...

引用

2022 International Applied Computational Electromagnetics Society Symposium, ACES-China 2022

ISBN: (纸本)9781665452366

In order to control the infrared radiation properties by adjusting the micro morphology of SiC particles, we analyze the radiation characteristics of solid and hollow SiC particles with different scales. The results show that the particle size has a great influence on the radiation characteristics of SiC spherical solid particles, and the particle thickness directly affects the amplitude changes of extinction and scattering absorption peaks of SiC spherical hollow particles with small scale (d=100nm). © 2022 IEEE.

关键词： Particle size

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Piecewise Linear Recursive Convolution Method Applied in One-dimensional Unmagnetized Plasma

Piecewise Linear Recursive Convolution Method Applied in One...

引用

2022 International Applied Computational Electromagnetics Society Symposium, ACES-China 2022

作者： Liu, Jiaqi Meng, Gang Mu, Lei Gao, Lu Mo, Jinjun Wu, Runhui Wang, Weidong National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics Beijing China Guilin University of Electronic Technology School of Information and Communication Guilin China

ISBN: (纸本)9781665452366

The piecewise linear recursive convolution(PLRC) method based on finite difference time domain(FDTD) is used to calculate the reflection and transmission characteristics of electromagnetic waves from one-dimensional unmagnetized plasma. The results are shown that this method has obvious advantages in accurately calculating the electromagnetic problems of one-dimensional, small-scale and thin-layer dielectric materials. © 2022 IEEE.

关键词： Electromagnetic waves

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Ballistic Target Micro-motion Parameters Identification with CNN Denoiser Based on Deep Learning

Ballistic Target Micro-motion Parameters Identification with...

引用

2022 International Applied Computational Electromagnetics Society Symposium, ACES-China 2022

作者： Lai, Ruixin Ai, Xia Wang, Shaoran Li, Mengmeng Liu, Jiaqi Ding, Dazhi Nanjing University of Science and Technology School of Electronics and Optical Engineering Nanjing China National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing100076 China

ISBN: (纸本)9781665452366

This paper proposes a method to identify micromotion parameters of radar echo with noise based on deep learning. The radar echo database is constructed from the point scattering model and the micro-Doppler spectrogram dataset is obtained then. The convolutional neural network is constructed to denoise radar echo with three kind of noises with different SNR, and target micro-motion parameters are identified. © 2022 IEEE.

关键词： Deep learning

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In-material measurement technique for brittle materials subjected to shock loading

In-material measurement technique for brittle materials subj...

引用

2011 International Conference on Electronic and Mechanical Engineering and Information technology, EMEIT 2011

作者： Xu, Songlin Liu, Yonggui Zheng, Hang Wang, Daorong CAS Key Laboratory for Mechanical Behavior and Design of Materials University of Science and Technology of China Hefei Anhui 230026 China National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing 100076 China

ISBN: (纸本)9781612840857

Two kinds of magnetic gauges, including electromagnetic particle velocity (EMV) gauge and a combined gauge composed of EMV gauge and electromagnetic (EM) stress gauge, are introduced to investigate the dynamic damage of brittle materials subjected to shock loading. The former is now used for the measurements of non-magnetic materials under pressure-shear impact loading. The latter one can be used in normal plate impact, and the experimental results with this gauge could be self-proofed. The preliminarily experimental results show that these techniques are satisfactory. © 2011 IEEE.

关键词： Gages

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Design of Non-uniform Flexible Meta-surface for Antenna Beam-steering 3

Design of Non-uniform Flexible Meta-surface for Antenna Beam...

引用

3rd IEEE International Conference on Electronic Information and Communication technology, ICEICT 2020

作者： Qiu, Yuwei Jiang, Zhiye Zheng, Pei School of Electronic Information Northwestern Polytechnical University Xi'an China National Key Laboratory of Science and Technology on Test Physics Numerical Mathematics Beijing China

ISBN: (纸本)9781728190457

Design of non-uniform flexible meta-surface for antenna beam-steering is presented in this paper. By properly tuning the dimensions of quasi-I-shaped unit cells on meta-surface, we propose a bi-layer meta-surface that can achieve beam deflection of up to 34°. Horn antenna is adopted as the feed antenna to illuminate the meta-surface which is printed on flexible plastic sheet. The meta-surface is fixed on the outside surface of horn antenna with an electric motor, making it possible to slide relative to the aperture of feed antenna. The horn antenna together with the meta-surface will work like a projector when operating, the main-beam of the horn antenna can be steered when different frames of the meta-surface cover the horn aperture and the steering range is ±34°•Radiation reconfigurable is thus achieved through a simple structure. Prototype will be fabricated in the following research. © 2020 IEEE.

关键词： Horn antennas

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