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| 1 | A Global Seamless Hybrid Constellation Design Approach with Restricted Ground Supporting for Space Information Network显示文摘In space information networks, satellites are generally in high speed orbit motion. In order to obtain better spacial and temporal coverage performance, satellites should cooperate with each other as a constellation. Previous works on constellations mainly focus on global seamless coverage using fewer satellites. However, like most countries, it is hard for China to build ground stations in overseas, and the geostationary Earth orbit position resource is scarce. In this paper, we investigate the constellation design problem with restricted ground supporting. We first proposes a 'backbone network + enhanced network' hybrid constellation design approach. Then a hybrid '4GEO+5IGSO' constellation is designed using the proposed approach, and the coverage performance of this constellation is analyzed in detail. Simulation results show the proposed approach can realize global seamless coverage only using a small number of satellites. Furthermore, the proposed hybrid constellation meets the coverage demand only relies on ground stations inside China. | Wei ZHANG Tao WU Hong MA Guixin LI | 2019 | Journal of Systems Science and Information2019，10，3： | 0 |
| 2 | Sulfur-induced dynamic reconstruction of iron-nitrogen species for highly active neutral oxygen reduction reactions显示文摘The neutral oxygen reduction reaction(ORR)has attracted tremendous attention for its broad prospects in next-generation power storage systems.However,the extremely sluggish cathodic reaction process and the limited cognition of the reaction mechanism greatly hinder its practical application.Here,we demonstrate a dynamic reconstruction behavior induced by sulfur of the iron-nitrogen(Fe-Nx)species in neutral solution.Our developed FeS_(1)N_(3)-OH configuration effectively optimizes the reaction kinetics by regulating the adsorption energy of oxygen intermediates for central catalytic sites.Consequently,this structure exhibits over 363%enhancement in ORR mass activity compared to the pristine FeN_(4) sites under neutral electrolyte.Moreover,a neutral zinc-air battery assembled with this electrocatalyst reached an ultrahigh peak power density(81.2 mW cm^(−2)),robust stability(more than 100 h)as well as superior tolerance to extreme environments(operating between−20°C and 60°C),representing a critical breakthrough for neutral ORR exploration and application. | Wenjie Wang Tianpei Zhou Kai Zhang Chun Wang Xiang Shi Lin Wang Qinghua Liu Yang Wang Qiyang Jiao Guixin Ma Chen Ye Yi Xie Xiaojun Wu Wangsheng Chu Changzheng Wu | 2022 | Science China Chemistry2022，65，12： | 0 |
| 3 | Review of Charge Accumulation on Spacers of Gas Insulated Equipment at DC Stress显示文摘Charge accumulation on the spacer surface in gas insulated equipment is very severe in the DC field,leading to easy flashover,which restricts the application of DC GIS/GIL.Therefore,knowledge about the charge accumulation characteristics of gas insulated equipment at DC stress is essential.In this paper,we reviewed the research methods and the characteristics of charge accumulation on spacers.A summary of charge measurement methods and setups are presented.And the surface charge inversion algorithms are introduced.Then the simulation model for charge accumulation in the DC field is reviewed.Subsequently,the charge accumulation mechanisms and phenomenon,the influence factor of surface charge accumulation and the influence of accumulated charge on spacer insulation characteristics are summarized.In addition,some suppression methods of surface charge accumulation are discussed.Finally,based on the understanding of charge accumulation on spacers,some suggestions on further studies are presented to aid in the design of a better spacer free from surface charges. | Hongyang Zhou Guoming Ma Cong Wang Jue Wang Guixin Zhang Youping Tu Chengrong Li | 2020 | CSEE Journal of Power and Energy Systems2020，6，3： | 0 |
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