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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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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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A New One-Dimensional Photonic Crystals for Infrared Emission Modulation

A New One-Dimensional Photonic Crystals for Infrared Emissio...

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

作者： Zhang, Yuning Zhang, Shengjun Song, Hang Cui, Yichun Liu, Jiaqi Ai, Lihong National Key Laboratory of Science & Technology on Test Physics and Numerical Mathematics Beijing China Capital Aerospace Machinery Corporation Limited Beijing China

ISBN: (纸本)9781665452366

With the wide application of infrared detection in the military field, the problem of how to reduce the probability of military targets being detected and identified has become urgent. In this paper, one-dimensional photonic crystals with wide incidence angle range are analyzed and simulated. The reflectance and transmittance properties of different structures are discussed with application in modulation of infrared emission. © 2022 IEEE.

关键词： Photonic crystals

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numerical and feasibility study of onboard MHD power extraction on supersonic vehicle 45

Numerical and feasibility study of onboard MHD power extract...

引用

45th EPS Conference on Plasma physics, EPS 2018

作者： Chai, Song Meng, Gang Wu, Runhui Liu, Jiaqi Liu, Xin Sun, Ruiqi 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

Within this paper, a concept model containing main features of on-board magnetohydrodynamic (MHD) generators has been constructed and its feasibility of power extraction on supersonic vehicle for a typical flight condition has been studied numerically. The results revealed that the MHD generator is capable of providing substantial energy output up to tens of kilowatts per square meter or even several hundred kilowatts if the alkali-seeded boundary layer has been coated. © Copyright (2018) by European Physical Society (EPS) All rights reserved.

关键词： Magnetohydrodynamic converters

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

Ballistic Target Micro-motion Parameters Identification with...

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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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A Physical Layer Key Generation method with Reliable Negotiation

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

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

Piecewise Linear Recursive Convolution Method Applied in One...

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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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A Radiation Pattern-Reconfigurable Patch Antenna with Tunable CSRR based on Liquid Metal and 3-D Printed Microfluidics

A Radiation Pattern-Reconfigurable Patch Antenna with Tunabl...

引用

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

作者： Wang, Yumeng Gao, Lu Zheng, Pei Song, Lingnan School of Electronic and Information Engineering Beihang University Beijing China National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing China

ISBN: (纸本)9781665452366

In this article, a radiation patternreconfigurable patch antenna with tunable complementary split-ring resonators (CSRR) based on liquid metal (LM) and 3-D printed microfluidics is presented. The antenna is composed of three layers, a top coaxial fed rectangular patch, a middle ground plane with two CSRRs etched symmetrically, and two bottom microfluidics channels each adhered underneath the corresponding CSRR. Pattern reconfiguration is achieved by filling the microfluidic channels with the liquid metal plugs to change the physical parameters of the CSRR structure. By adjusting the length of the slot stubs in CSRRs, the main beam of the double CSRR-loaded antenna can be continuously scanned from -46° to 46° in elevation plane. © 2022 IEEE.

关键词： Slot antennas

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Source-Configured Microwave Plasmonic Vortices Based on Single Meta-Particle

Source-Configured Microwave Plasmonic Vortices Based on Sing...

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2023 International Applied Computational Electromagnetics Society Symposium, ACES-China 2023

作者： Kong, Xianglin Zhao, Lei Shen, Xiaopeng Xu, Yinfang School of Information and Control Engineering China School of Materials Science and Physics China University Mining and Technology Xuzhou China National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics Beijing China

ISBN: (纸本)9781733509657

In this paper, generation of plasmonic vortices with tunable topologic charges is proposed in the microwave regime. Tunable vortices with topologic charges of 0, +1 and -1 can be configured by illuminating incident plane waves with linearly polarization (LP), left-circularly polarization (LHCP) and right-circularly polarization (RHCP) on a single meta-particle, respectively. A spiral meta-particle operating at 2.94 GHz is designed, fabricated and measured to demonstrate the source-configured characteristics. The results showed that simulation and test are consistent with the theoretical ones. © 2023 Applied Computational Electromagnetics Society (ACES).

关键词： Vortex flow

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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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