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2022 IEEE International Conference on Unmanned Systems, ICUS 2022

作者： He, Yuxin Zhuang, Yaqiang Zhuang, Xuebin Lin, Zijian School of System Science and Engineering Sun Yat-sen University Guangzhou China School of Integrated Circuits and Electronics Beijing Institute of Technology Beijing Key Laboratory of Millimeter Wave and Terahertz Technology Beijing China Science and Technology On Complex Aviation Systems Simulation Laboratory Beijing China

ISBN: (数字)9781665484565

ISBN: (纸本)9781665484565

By broadcasting false Global Navigation Satellite System (GNSS) signals, spoofing attacks will induce false position and time fixes within the victim receiver. In this article, we propose a Sparse Decomposition (SD)-based spoofing detection algorithm in the acquisition process, which can be applied in a single-antenna receiver. In the first step, we map the Fast Fourier transform (FFT)-based acquisition result in a two-dimensional matrix, which is a distorted autocorrelation function when the receiver is under spoof attack. In the second step, the distorted function is decomposed into two main autocorrelation function components of different code phases. The corresponding elements of the result vector of the SD are the code-phase values of the spoofed and the authentic signals. Numerical simulation results show that the proposed method can not only outcome spoofing detection result, but provide reliable estimations of the code phase delay of the spoof attack. © 2022 IEEE.

关键词： Fast Fourier transforms

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Evolution of N=20,28,50 shell closures in the 20≤Z≤30 region in deformed relativistic Hartree-Bogoliubov theory in continuum

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Chinese Physics C 2024年第1期48卷 144-153页

作者：郑茹尤孙向向申国防耿立升 School of Physics Beihang UniversityBeijing102206China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Institut für Kernphysik Institute for Advanced Simulation and Jülich Center for Hadron PhysicsForschungszentrum JülichD-52425 JülichGermany CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China Peng Huanwu Collaborative Center for Research and Education Beihang UniversityBeijing 100191China Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beihang UniversityBeijing 102206China Southern Center for Nuclear-Science Theory(SCNT) Institute of Modern PhysicsChinese Academy of SciencesHuizhou 516000China

Magicity,or shell closure,plays an important role in our understanding of complex nuclear *** this work,we employ one of the state-of-the-art density functional theories,the deformed relativistic Hartree-Bogoliubov theory in continuum(DRHBc)with the density functional PC-PK1,to investigate the evolution of the N=20,28,50 shell closures in the 20≤Z≤30 *** show how these three conventional shell closures evolve from the proton drip line to the neutron drip line by studying the charge radii,two-neutron separation energies,two-neutron gaps,quadrupole deformations,and single-particle *** particular,we find that in the 21≤Z≤27 region,the N=50 shell closure disappears or becomes quenched,mainly due to the deformation ***,both experimental data and theoretical predictions indicate that the N=28 shell closure disappears in the Mn isotopic chain,mainly due to the deformation *** DRHBc theory predicts the existence of the N=20 shell closure in the Ca,Sc,and Ti isotopic chains,but the existing data for the Ti isotopes suggest the contrary,and therefore further research is needed.

关键词： shell evolution covariant density functional theories magic numbers

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A New Control Method of VSC to Supporting Instantaneous Voltage at PCC Point 18th

A New Control Method of VSC to Supporting Instantaneous Volt...

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18th Annual Conference of China Electrotechnical Society, ACCES 2023

作者： Ji, Feng Gu, Huaiguang Gao, Lu Lin, Chang Zhu, Chengzhi Chen, Xiaogang State Key Laboratory of Advanced Transmission Technology State Grid Smart Grid Research Institute Co. LTD. Changping District Beijing102200 China Beijing Key Laboratory of DC Power Grid Technology and Simulation State Grid Smart Grid Research Institute Co. LTD. Changping District Beijing102200 China State Grid Zhejiang Electric Power Co. LTD. Beijing China

ISBN: (纸本)9789819714469

In recent years, the engineering practice shows that the VSC has obvious drawbacks when it is connected to weak grid. It is easy to cause insufficient voltage support at PCC point of power systems. In order to solve this problem, this paper proposed an instantaneous voltage control method by using the integral characteristic of filter capacitance, which is also based on the instantaneous current control method. Because there is only one low leakage reactance transformer between the external potential of VSC and the PCC point, the two are strongly connected, which can effectively control the voltage of PCC point. At first, this paper analyzed the principle of PCC instantaneous voltage control method. Then, the frequency response and stability of the proposed method are analyzed in the complex frequency domain. In the electromagnetic transient simulation software, the voltage support capacity and fault ride through ability of the proposed method is simulated and verified. Finally, this paper compared the proposed method proposed with the other existing method - the proposed method is simpler, more reliable, and more widely applicable and has strong voltage support capacity and fault ride through ability, which can provide key technical support for the construction of new power system dominated by new energy in the future. © Beijing Paike Culture Commu. Co., Ltd. 2024.

关键词： Capacitance

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Research on Modular Inverter Control technology of Dual Three-Phase Permanent Magnet Synchronous Motor

Research on Modular Inverter Control Technology of Dual Thre...

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IEEE International Conference on Power and Power and Renewable Energy (ICPRE)

作者： Changfang Wei Yiming Song Jin Wang Libing Zhou State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan China AECC Hunan Aviation Powerplant Research Institute Zhuzhou China

ISBN: (数字)9798350377460

ISBN: (纸本)9798350377477

Using medium-voltage DC transmission instead of traditional three-phase AC transmission can significantly reduce cable losses. However, high DC bus voltages pose challenges for voltage equalization across inverter modules. This paper proposes a topology for a modular dual three-phase permanent magnet synchronous motor (PMSM) inverter, and studies its dual closed-loop vector control and modular inverter voltage equalization control strategies. By using a series connection of inverters and three-phase decoupled PWM technology for individual control of inverter modules, a modular inverter series bus voltage equalization control strategy is established. Compared to parallel modular inverter, it can further reduce voltage fluctuations and enhance the dynamic performance of the motor. simulation has verified the performance of the motor operation based on this control strategy, demonstrating that this method can achieve effective voltage equalization.

关键词： Renewable energy sources Voltage fluctuations Fluctuations Pulse width modulation Permanent magnet motors Inverters Stability analysis Topology Voltage control Underwater vehicles

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Fabrication of silica-based ceramic cores with internal lattice structures by stereolithography

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China Foundry 2022年第5期19卷 369-379页

作者： Ke-hui Hu Hao-yuan Wang Kuan Lu Qian Feng Dao-ding Yang Jian Cao Bo Zhang Zhi-gang Lü Xing Ran State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Ten Dimensions(Guangdong)Technology Co. Ltd.Foshan 528225GuangdongChina Guizhou Anji Aviation Investment Casting Co. Ltd.Anshun 561003GuizhouChina Key Laboratory of Advanced Materials Processing Technology Ministry of EducationTsinghua UniversityBeijing 100084China

Ceramic cores are widely used in investment casting,and ideal properties of cores are essential for high-quality *** the circumstances requiring thick cores,solid cores are likely to encounter deformation and cracking defects due to the accumulation of ***,with the superiority of ceramic stereolithography in producing complex ceramic parts,hollow cores with lattice structures were designed and *** dimensional accuracy and properties of the green and sintered bodies were *** show the dimensional accuracy of sintered cores is controlled within±0.25 mm benefited from the precise green *** mechanical properties are not obviously *** bending strength reaches 11.94 MPa at room temperature and 12.87 MPa at 1,500℃ with a creep deformation of 0.345 ***,casting verifications prove that the hollow cores meet the requirements of investment *** casting surfaces are obtained,at the same time,the core-removal efficiency is improved by over 3 times.

关键词： silica ceramic cores stereolithography lattice structure investment casting

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Microstructuring Conductive Electrospun Mats for Enhanced Electro‑active Biofilm Growth and High‑Performance Bioelectrocatalysis

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advanced Fiber Materials 2023年第5期5卷 1699-1711页

作者： Min Li Hao Lu Jiadong Hu Xuemei Xiang Yanling Zheng Wenhu Gao Wei Sun Wei Wang Zhisong Lu Yan Qiao Institute for Clean Energy and Advanced Materials School of Materials and EnergySouthwest UniversityChongqing 400715People’s Republic of China Sino‑Singapore Joint Laboratory of Materials and Technologies for Proactive Health Monitoring School of Materials and EnergySouthwest UniversityChongqing 400715People’s Republic of China Experimental Center for Virtual Simulation of Sports and Health Southwest UniversityChongqing 400715People’s Republic of China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University TechnologyWuhan 430070People’s Republic of China Hubei Longzhong Lab Xiangyang 441000People’s Republic of China Key Laboratory of Laser Technology and Optoelectronic Functional Materials of Hainan Province College of Chemistry and Chemical EngineeringHainan Normal UniversityHaikou 571158People’s Republic of China Singapore Institute of Manufacturing Technology Singapore 138669Singapore

Electrospun materials have attracted considerable attention in microbial fuel cells(MFC)owing to their porous structures,which facilitate the growth of electro-active biofilms(EABs).However,the impact of fiber diameter-controlled porous architectures on EAB growth and MFC performance has not been extensively ***,a highly conductive polypyrrole-modified electrospun polyacrylonitrile(PAN)mat was prepared as an electrode material for Shewanella putrefaciens CN32-based *** dominant pore size of the corresponding mat increases from 1 to around 20μm as the fiber diameter increases from 720 to 3770 *** variation affects the adhesion and growth behaviors of electrochemically active bacteria on the mat-based *** electrodes with poresranging from 2 to 10μm allow bacterial penetration into the interior,leading to significant biofilm loading and effective ***,the tight lamination of the electrospun fibers restricts bacterial growth in the deep interior *** developed a friction-induced triboelectric expanding approach to rendering the mats with layered structures to overcome this *** inter-layer spaces of the expanded conductive mat can facilitate bacterial loading from both sides of each layer and serve as channels to accelerate the catalysis of organic ***,the expanded conductive mat with appropriate pore sizes delivers superior bioelectrocatalytic performance in MFCs and dye *** on the findings,a mechanism for the porous structure-controlled EAB formation and bioelectrocatalytic performance was *** work may provide helpful guidance and insights for designing microfiber-based electrodes for microbial fuel cells.

关键词： Electrospun mat Porous structure Bioelectrocatalysis Microbial fuel cells Polypyrrole

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Raman investigation of hydration structure of iodide and iodate

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Chinese Physics B 2021年第4期30卷 226-230页

作者： Zhe Liu Hong-Liang Zhao Hong-Zhi Lang Ying Wang Zhan-Long Li Zhi-Wei Men Sheng-Han Wang Cheng-Lin Sun Key Laboratory of Physics and Technology for Advanced Batteries(Ministry of Education) College of PhysicsJilin UniversityChangchun 130012China Coherent Light and Atomic and Molecular Spectroscopy Laboratory College of PhysicsJilin UniversityChangchun 130012China College of Aviation Foundation Aviation University of Air ForceChangchun 130000China

In the troposphere,the destruction of ozone and the formation of new particles are closely related to the iodine content,which mainly comes from iodide(I^(-)) and iodate(IO_(3)^(-)) in the ***,understanding the interactions between I^(-),IO_(3)^(-)and water molecules plays a certain role in alleviating the destruction of the ozone *** spectroscopy is commonly used to obtain the information of the interaction between I^(-),IO_(3)^(-)and water molecules quickly and ***,the effect of I^(-)and IO_(3)^(-)on the change in Raman band characteristics of water is investigated to reflect the associated intermolecular interactions *** the addition of the two ions,the Raman band corresponding to OH stretching vibration moves towards the high wavenumber,indicating the formation of hydration *** narrowing of the Raman band from OH stretching vibration under weak hydrogen bond agrees well with the hydrogen bond variation,while the abnormal broadening of the Raman band from OH stretching vibration under strong hydrogen bond indicates the formation of H-down *** the increase of ions concentration,the frequency shift of the Raman band from OH stretching vibration under both weak and strong hydrogen bonds becomes more ***,the frequency shift of I^(-)is more obvious than that of IO_(3)^(-),which indicates that I^(-)is more likely to form the hydration structure with water than IO_(3)^(-).These results contribute to analyzing the different interactions between I^(-)-water and IO_(3)^(-)-water,then helping to prevent ozone depletion.

关键词： Raman spectroscopy hydrogen bond hydration structure

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Interfacial Si-O Coordination for Inhibiting the Graphite Phase Enables Superior Sic/Nb Heterostructure Joining by Auni

SSRN

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SSRN 2024年

作者： Li, Peixin Yan, Yaotian Zhang, Zilong Wang, Yaoxuan Zhang, Jingkang Qiao, Liang Cao, Jian Qi, Junlei State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin150001 China Key Laboratory of Materials Design and Quantum Simulation College of Science Changchun University Changchun130022 China

The reaction between SiC and Ni base brazing alloy is extremely intense, where the brittle Ni-Si compound and accompanied dissociate graphite phase as the interfacial reaction product in the joint damage the mechanical properties. In this study, the design of "graphite-controlled" heterogeneous integration component structure on SiC surface is developed to weaken the intense reaction of Ni and SiC. The high-quality surface Si-O coordination was successfully achieved by plasma enhanced chemical vapor deposition (PECVD) method at relatively low temperature on SiC, which increases the Si bond strength due to that the higher binding energy of Si-O (451 KJ/mol) than that of Si-C (347 KJ/mol). SiO2 films enhance the mechanical properties of the joint through macro-weak side interface interlocking and micro-stress mismatch regulation. The shear strength of SiC/Nb heterostructure joints by AuNi alloy was increased by 44%, which paves an inspiring way for boosting heterogeneous integration of SiC ceramic components. © 2024, The Authors. All rights reserved.

关键词： Binary alloys

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Biodiversity conservation and ecological restoration of vulnerable ecosystems in the Anthropocene

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Journal of Plant Ecology 2024年第5期17卷 1-4页

作者： Zhonghua Ning Tian Xie Xinxin Wang Zhenchang Zhu Cong Chen Baoshan Cui Key Laboratory of Ecological Protection in the Yellow River Basin of National Forestry and Grassland Administration School of Ecology and Nature ConservationBeijing Forestry UniversityBeijing 100083China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of EnvironmentBeijing Normal UniversityBeijing 100875China Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering National Observations and Research Station for Wetland Ecosystems of the Yangtze EstuarySchool of Life ScienceFudan UniversityShanghai 200433China School of Ecology Environment and ResourcesGuangdong University of TechnologyGuangzhou 510006China Research and Development Center for Watershed Environmental Eco-engineering Advanced Institute of Natural SciencesBeijing Normal UniversityZhuhai 519087China

This editorial summarizes the contributions to the Special Issue Biodiversity conservation and ecological restoration of vulnerable ecosystems in the Anthropocene',established under the Journal of Plant Ecology.

关键词： Biodiversity ecosystems restoration

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EPIMR:Prediction of Enhancer-Promoter Interactions by Multi-Scale ResNet on Image Representation

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Big Data Mining and Analytics 2024年第3期7卷 668-681页

作者： Qiaozhen Meng Yinuo Lyu Xiaoqing Peng Junhai Xu Jijun Tang Fei Guo School of Computer Science and Technology College of Intelligence and ComputingTianjin UniversityTianjin 300350China Aeronautical Information Service Center of the Civil Aviation Administration of China(AISC.ATMB.CAAC) Beijing 100015China Center for Medical Genetics&Hunan Key Laboratory of Medical Genetics School of Life SciencesCentral South UniversityChangsha 410038China Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhen 518000China School of Computer Science and Engineering Central South UniversityChangsha 410083China

Prediction of enhancer-promoter interactions(EPIs)is key to regulating gene expression and diagnosing genetic *** to limited resolution,biological experiments perform not as well as expected while precisely identifying specific interactions,giving rise to computational biology *** EPI predictors have been developed,but their prediction accuracy still needs to be ***,we design a new model named EPIMR to identify enhancer-promoter ***,Hilbert Curve is utilized to represent sequences to images to preserve the position and spatial ***,a multi-scale residual neural network(ResNet)is used to learn the distinguishing features of different abstraction ***,matching heuristics are adopted to concatenate the learned features of enhancers and promoters,which pays attention to their potential interaction *** results on six cell lines indicate that EPIMR performs better than existing methods,with higher area under the precision-recall curve(AUPR)and area under the receiver operating characteristic(AUROC)results on benchmark and under-sampling ***,our model is pre-trained on all cell lines,which improves not only the transferability of cross-cell line prediction,but also cell line-specific prediction *** conclusion,our method serves as a valuable technical tool for predicting enhancer-promoter interactions,contributing to the understanding of gene transcription *** code and results are available at https://***/guofei-tju/EPIMR.

关键词： enhancer-promoter interactions Hilbert Curve multi-scale residual neural network(ResNet)

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