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2018 IEEE International Conference on Computational Electromagnetics, ICCEM 2018

作者： Wang, Weidong Liu, Xin Wang, Mingliang Liu, Jiaqi Meng, Gang Gao, Zhiyong Mu, Lei Ai, Xia Zhang, Shengjun Li, Jianbing Beijing Institute of Space Long March Vehicle National Key Laboratory of Science and Technology on Test Physics Numerical Mathematical Beijing China College of Electronic Science National University of Defense Technology Changsha China

ISBN: (纸本)9781538612415

In this paper, a method of shielding the object behind a discrete metal wire array is proposed and verified by anechoic chamber experiments. Results show that if the metal wire array is dense enough (cell size is smaller than half of the wavelength), the object behind it can be effectually shielded by the discrete metal wire array. The principle can be applied to electromagnetic camouflage and protection. © 2018 IEEE.

关键词： Electromagnetic shielding

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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...

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

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

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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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Dual-Polarized Filtering Antenna for Base Station Application

Dual-Polarized Filtering Antenna for Base Station Applicatio...

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International Conference on Microwave and Millimeter Wave technology Proceedings

作者： Chao Feng Ding Xiu Yin Zhang Zhi Jie Zhang Yun Fei Cao Lu Gao Jun Yang School of Electronic and Information Engineering South China University of Technology Guangzhou China The State Key Laboratory of Millimeter Waves Nanjing China National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing China

In this paper, a broadband dual-polarized filtering dipole is proposed for base station application. Filtering response is obtained by adding simple slits on each arm of the traditional dual polarized dipole antenna. Both lower and upper stopband radiation nulls are generated. The operating bandwidth of the proposed antenna is 1.7-2.9 GHz (52%). The out-of-band suppression level is about 10 dB within 0.69-1.5 GHz and 3.3-3.8 GHz. The simulated port isolation is more than 26 dB. The proposed antenna element is suitable for potential base station applications.

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Fourth Hankel Determinant for a Subclass of Starlike Functions Based on Modified Sigmoid

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Journal of Function Spaces 2021年第1期2021卷

作者： Mashwani, Wali Khan Ahmad, Bakhtiar Khan, Nazar Khan, Muhammad Ghaffar Arjika, Sama Khan, Bilal Chinram, Ronnason Institute of Numerical Sciences Kohat University of Science and Technology Kohat Pakistan Govt. Degree College Mardan Mardan 23200 Pakistan Department of Mathematics Abbottabad University of Science and Technology Abbottabad 22010 Pakistan Department of Mathematics and Informatics University of Agadez Agadez Niger International Chair of Mathematical Physics and Applications (ICMPA-UNESCO Chair) University of Abomey-Calavi Post Box 072 50 Cotonou Benin School of Mathematical Sciences Shanghai Key Laboratory of PMMP East China Normal University 500 Dongchuan Road Shanghai 200241 China Algebra and Applications Research Unit Division of Computational Science Faculty of Science Prince of Songkla University Hat Yai Songkhla 90110 Thailand

In our present investigation, we obtain the improved third-order Hankel determinant for a class of starlike functions connected with modified sigmoid functions. Further, we investigate the fourth-order Hankel determinant, Zalcman conjecture, and also evaluate the fourth-order Hankel determinants for 2-fold, 3-fold, and 4-fold symmetric starlike functions. © 2021 Wali Khan Mashwani et al.

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PolSAR Image Edge Detection via Structure Tensor Analysis

PolSAR Image Edge Detection via Structure Tensor Analysis

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IEEE International Geoscience and Remote Sensing Symposium

作者： Xiangrong Liu Wei Mao Shunsheng Zhang Lei Wu Wen-Qin Wang National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing China Sch. of Info. Comm. Engin. University of Electronic Science and Technology of China Chengdu China

The weighted structure tensor (ST) can be usually used on edge detection of multi-channel images, including polarimetric synthetic aperture radar (polSAR) images. The traditional weighting method is average weighting, each channel considered to provide the same edge information. But in fact different channels tend to contain different amount of edge information, so the traditional weighting method cannot be adopted to extract full edge information of the multi-channel images. This letter proposes a novel weighting method for ST, in which the weight of each channel is obtained by the eigenvalue-measured way. Experimental results show that the proposed method outperforms the traditional method on edge detection.

关键词： Image edge detection Eigenvalues and eigenfunctions Estimation Optical imaging Hyperspectral imaging Corner detection

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Two-Dimensional Imaging With Stationary Nonuniform Frequency Diverse Array Transmitter

Two-Dimensional Imaging With Stationary Nonuniform Frequency...

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IEEE International Geoscience and Remote Sensing Symposium

作者： Xiangrong Liu Wei Mao Lei Wu National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing China Sch. of Info. Comm. Engin. University of Electronic Science and Technology of China Chengdu China

This paper proposes a simple two-dimensional imaging via stationary nonuniform frequency diverse array (FDA) transmitter by exploiting FDA both range and angle dependent transmit beampattern. The nonuniform FDA transmitter only generates range-dependent beampattern, so that two-dimensional (range-angle dimension) imaging of targets can be achieved without the employment of moving radar platform, by jointly utilizing the only range-dependent transmitter beampattern and general single-antenna or phased-array antenna. The effectiveness of the proposed method is verified by simulation results.

关键词： Radar imaging Imaging Frequency diversity Radar antennas Transmitters Radar remote sensing

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Automatic MHT Method Based on Target Characteristics Applied in the Small Space Targets

Automatic MHT Method Based on Target Characteristics Applied...

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2018 3rd International Conference on Design, Mechanical and Material Engineering (D2ME 2018)

作者： Qian ZHAO Zhenhong NIU Lian XUE Xin LIU Jianhua LI Zhifeng LI National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics

The Multi-Hypothesis Tracking(MHT) method is one of the most promising approaches to realize automatic tracking of small and dim targets in complex space ***,the number of hypotheses generated by this algorithm has an exponentially increasing relationship with the number of trajectories,measurement data,and the number of image *** the paper,the automatic detection and tracking method of judging the confidence coefficient of the trajectory obtained by the MHT which is based on the characteristics of dim targets,has been realized in the IRST *** performance of this method is greatly improved.

关键词： image Automatic MHT Method Based on Target Characteristics Applied in the Small Space Targets MHT Target

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The Design of Large Arc-shape High-precision Walking Device in TV(thermal-vacuum) Conditions

The Design of Large Arc-shape High-precision Walking Device ...

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2018 3rd International Conference on Design, Mechanical and Material Engineering (D2ME 2018)

作者： Xue Lian Nan Hua Liu Jiaqi Liu Xin Meng Gang National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics

The large-sized space environmental simulation test facility is mainly used for providing thermal radiation environment in high-vacuum,cold and dark space for satellites,spacecraft,lunar spacecraft to carry out whole satellite thermal vacuum test and for large equipment like antenna to carry out tests in TV *** the spacecraft's surface optical image or temperature is a main task in space environment simulation *** previous tests,optical image test mainly took place in a fixed position,so the measuring location and angle are *** paper focuses on large spherical space environmental simulation test facility,and designs a large arc-shape high-precision walking device in a space environment simulation test *** introduces key technology in detail like structure design,thermal design,processes and manufacturing,*** test results show that this device can work steadily and reliably under simulation space environments,and the precision exceeds 0.5.

关键词： thermal-vacuum Conditions The Design of Large Arc-shape High-precision Walking Device in TV Arc

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Author Correction: Transverse oscillations and an energy source in a strongly magnetized sunspot

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Nature Astronomy 2024年 674页

作者： Ding Yuan Libo Fu Błażej Kuźma Xueshang Feng Wenda Cao Michaël Geeraerts Tom Van Doorsselaere Juan C. Trelles Arjona Carlos Quintero Noda Basilio Ruiz Cobo Kris Murawski Abhishek K. Srivastava Yuhu Miao Song Feng Jiangtao Su Institute of Space Science and Applied Technology Harbin Institute of Technology Shenzhen Guangdong China Key Laboratory of Solar Activity and Space Weather National Space Science Center Chinese Academy of Sciences Beijing China Shenzhen Key Laboratory of Numerical Prediction for Space Storm Harbin Institute of Technology Shenzhen Guangdong China Big Bear Solar Observatory New Jersey Institute of Technology Big Bear City CA USA Center for Solar-Terrestrial Research New Jersey Institute of Technology Newark NJ USA Centre for mathematical Plasma Astrophysics Mathematics Department KU Leuven Leuven Belgium Instituto de Astrofísica de Canarias (IAC) San Cristóbal de La Laguna Tenerife Spain Dept. Astrofísica Universidad de La Laguna San Cristóbal de La Laguna Tenerife Spain Institute of Physics University of M. Curie-Skłodowska Lublin Poland Department of Physics Indian Institute of Technology (BHU) Varanasi India School of Information and Communication Shenzhen Institute of Information Technology Shenzhen Guangdong China Faculty of Information Engineering and Automation Kunming University of Science and Technology Kunming Yunnan China National Astronomical Observatories Chinese Academy of Sciences Beijing China School of Astronomy and Space Sciences University of Chinese Academy of Sciences Beijing China

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