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| 1 | Sequential quadratic programming-based non-cooperative target distributed hybrid processing optimization method显示文摘The distributed hybrid processing optimization problem of non-cooperative targets is an important research direction for future networked air-defense and anti-missile firepower systems. In this paper, the air-defense anti-missile targets defense problem is abstracted as a nonconvex constrained combinatorial optimization problem with the optimization objective of maximizing the degree of contribution of the processing scheme to non-cooperative targets, and the constraints mainly consider geographical conditions and anti-missile equipment resources. The grid discretization concept is used to partition the defense area into network nodes, and the overall defense strategy scheme is described as a nonlinear programming problem to solve the minimum defense cost within the maximum defense capability of the defense system network. In the solution of the minimum defense cost problem, the processing scheme, equipment coverage capability, constraints and node cost requirements are characterized, then a nonlinear mathematical model of the non-cooperative target distributed hybrid processing optimization problem is established, and a local optimal solution based on the sequential quadratic programming algorithm is constructed, and the optimal firepower processing scheme is given by using the sequential quadratic programming method containing non-convex quadratic equations and inequality constraints. Finally, the effectiveness of the proposed method is verified by simulation examples. | SONG Xiaocheng WANG Jiangtao WANG Jun SUN Liang FENG Yanghe LI Zhi | 2023 | Journal of Systems Engineering and Electronics2023，34，1： | 1 |
| 2 | Asymptotically Optimal Golay-ZCZ Sequence Sets with Flexible Length显示文摘Zero correlation zone(ZCZ)sequences and Golay complementary sequences are two kinds of sequences with different preferable correlation properties.Golay-ZCZ sequences are special kinds of complementary sequences which also possess a large ZCZ and are good candidates for pilots in OFDM systems.Known Golay-ZCZ sequences reported in the literature have a limitation in the length which is the form of a power of 2.In this paper,we propose two constructions of Golay-ZCZ sequence sets with new parameters which generalize the constructions of Gong et al.(IEEE Trans.Commun.,61(9),2013)and Chen et al.(IEEE Trans.Commun.,66(11),2018).Notably,one of the two constructions generates optimal binary Golay-ZCZ sequences,while the other generates asymptotically optimal polyphase Golay-ZCZ sequences as the number of sequences increases.We also show,through numerical simulations,the applicability of the proposed Golay-ZCZ sequences in inter-symbol interference channel estimation.Interestingly,in certain application scenarios,the proposed Golay-ZCZ sequences performs better as compared to the existing state-of-the-art sequences. | GU Zhi ZHOU Zhengchun Adhikary Avik Ranjan FENG Yanghe FAN Pingzhi | 2023 | Chinese Journal of Electronics2023，32，4： | 1 |
| 3 | Room-temperature ferroelectric polarization in multiferroic BiMnO3显示文摘 | CHI Z H YANGH FENG S M | 2007 | J Magn Magn Mater2007，310，2： | 1 |
| 4 | Construction of isolated Ni sites on nitrogen-doped hollow carbon spheres with Ni-N_(3) configuration for enhanced reduction of nitroarenes显示文摘Designing and synthesizing high-efficiency non-precious metal-based catalysts having uniform active sites increases the reactivity and selectivity of materials and provides a platform for an in-depth understanding of their catalytic reaction mechanism.In this study,we provided an approach for fabricating isolated nickel single-atom sites(Ni SAs)with high loading(4.9 wt.%)stabilized on nitrogen-doped hollow carbon spheres(NHCS)using a core–shell structured Zn/Ni bimetallic zeolitic imidazolate framework(ZIF)composite as the sacrificial template.The as-fabricated Ni SAs/NHCS catalyst shows superior activity,selectivity,and recycling durability for the catalytic transfer hydrogenation of nitrobenzene to aniline,thus achieving 100%yield of aniline with a turn-over frequency(TOF)value as high as 29.9 h^(−1) under mild conditions.This TOF value is considerably superior to the supported Ni nanoparticle catalysts.The experiments designed show that the hollow structure feature of NHCS facilitates accessible active sites and mass transfer,which thus contributes to the enhancement of the catalytic performance of Ni SAs/NHCS.Density functional theory calculations show the high chemo-selectivity and activity of the Ni SAs catalyst,arising from the unique role of the single Ni-N3 site on simultaneously activating the H donor(N_(2)H_(4))and substrate,as well as the hydrogenation of the–NOH group as the rate-determining step. | Binbin Feng Rou Guo Qiulan Cai Yaping Song Nan Li Yanghe Fu De-Li Chen Jiangwei Zhang Weidong Zhu Fumin Zhang | 2022 | Nano Research2022，15，7： | 0 |
| 5 | Heuristic dynamic programming-based learning control for discrete-time disturbed multi-agent systems显示文摘Owing to extensive applications in many fields,the synchronization problem has been widely investigated in multi-agent systems.The synchronization for multi-agent systems is a pivotal issue,which means that under the designed control policy,the output of systems or the state of each agent can be consistent with the leader.The purpose of this paper is to investigate a heuristic dynamic programming(HDP)-based learning tracking control for discrete-time multi-agent systems to achieve synchronization while considering disturbances in systems.Besides,due to the difficulty of solving the coupled Hamilton–Jacobi–Bellman equation analytically,an improved HDP learning control algorithm is proposed to realize the synchronization between the leader and all following agents,which is executed by an action-critic neural network.The action and critic neural network are utilized to learn the optimal control policy and cost function,respectively,by means of introducing an auxiliary action network.Finally,two numerical examples and a practical application of mobile robots are presented to demonstrate the control performance of the HDP-based learning control algorithm. | Yao Zhang Chaoxu Mu Yong Zhang Yanghe Feng | 2021 | Control Theory and Technology2021，19，3： | 0 |
| 6 | PdZn intermetallic compound stabilized on ZnO/nitrogendecorated carbon hollow spheres for catalytic semihydrogenation of alkynols显示文摘Enhancing the selectivity of noble metal catalysts through electronic modulation is important for academic research and chemical industrial processes.Herein,we report a facile sacrificial template strategy for the synthesis of PdZn intermetallic compound(3-4 nm)highly distributed in ZnO/nitrogen-decorated carbon hollow spheres(PdZn-ZnO/NCHS)to optimize the selectivity of Pd catalysts,which involves carbonization of a core-shell structured polystyrene(PS)@ZIF-8 precursor in an inert atmosphere,impregnation Pd precursor,and subsequent H2 reduction treatment.Due to the unique structural and compositional features,the developed PdZn-ZnO/NCHS delivers an excellent catalytic performance for the semihydrogenation of 2-methyl-3-butyn-2-ol(MBY)to 2-methyl-3-buten-2-ol(MBE)with high activity(>99%),high selectivity(96%),and good recyclability,outperforming the analog Pd on ZnO(Pd/ZnO)as well as the supported Pd nanoparticles(Pd/C and Pd/NC).Density functional theory(DFT)calculations reveal that the presence of Znδ+species in PdZn-ZnO/NCHS alters the adsorption modes of reactant and product,leading to a decrease of the adsorption strength and an enhancement of the energy barrier for overhydrogenation,which results in a kinetic favor for the selective transformation of MBY to MBE.In addition,PdZn-ZnO/NCHS was also very effective for the partial hydrogenation of dehydrolinalool to hydrolinalool. | Chunlin Ye Xujian Chen Shasha Li Binbin Feng Yanghe Fu Fumin Zhang De-Li Chen Weidong Zhu | 2022 | Nano Research2022，15，4： | 0 |
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