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| 1 | Nonuniform Three-dimensional Configuration Distributed SAR Signal Reconstruction Clutter Suppression显示文摘This paper deals with the problem of clutter suppression in spaceborne distributed synthetic aperture radar (D-SAR) with nonuniform three-dimensional (3D) configuration geometry. In order to make a breakthrough of the configuration limitation of the traditional space time adaptive processing (STAP) based on uniform array and improve the inhomogeneous clutter suppression performance, this paper considers signal reconstruction technique using array interpolation to process the D-SAR signal. An array interpolation signal reconstruction method based on pitching-partition is derived then a signal reconstruction 3D-STAP clutter suppression method applied to nonuniform 3D configuration is proposed. In particular, the proposed method is compared with conventional methods and the performance analysis is carried out based on simulations. The improvement factor (IF) for clutter suppression is imported and reported as a benchmark on the clutter suppression effect. | LIU Mei ZHANG Lei LI Chenlei | 2012 | Chinese Journal of Aeronautics2012，25，3： | 4 |
| 2 | Silicon-based on-chip hybrid(de)multiplexers显示文摘A review is given on the recent progress of silicon-based on-chip hybrid multiplexers, which are the key elements to enable more than one(de)multiplexing techniques simultaneously, including wavelengthdivision-multiplexing(WDM), polarization-division-multiplexing(PDM), and mode-division-multiplexing(MDM). This helps enhance the link capacity of optical interconnects multiplexed with many channels.The first part gives a review on the recent developed silicon-based hybrid WDM-PDM(de)multiplexers enabling WDM and PDM simultaneously, which helps achieve 2 N channels by introducing N wavelengths and dual polarizations. The recent progress of silicon-based hybrid WDM-MDM(de)multiplexers developed is reviewed in the second part. With the hybrid WDM-MDM(de)multiplexers, one can achieve N × M channels by using N wavelengths and M guided-modes. Finally, the silicon-based hybrid MDM-PDM(de)multiplexers are presented as the key to enhance the link capacity for a single wavelength carrier. | Chenlei LI Hao WU Ying TAN Shipeng WANG Daoxin DAI | 2018 | Science China(Information Sciences)2018，61，8： | 1 |
| 3 | Solidification Interface Shape Control in a Continuous Czochralski Silicon Growth System 显示文摘 | Wang ChenLei Zhang Hui Wang Ti Hu Zheng Li Li | 2006 | Crystal Growth2006，287，： | 1 |
| 4 | FrFT-CSWSF: Estimating cross-range velocities of ground moving targets using multistatic synthetic aperture radar显示文摘Estimating cross-range velocity is a challenging task for space-borne synthetic aperture radar(SAR), which is important for ground moving target indication(GMTI). Because the velocity of a target is very small compared with that of the satellite, it is difficult to correctly estimate it using a conventional monostatic platform algorithm. To overcome this problem, a novel method employing multistatic SAR is presented in this letter. The proposed hybrid method, which is based on an extended space-time model(ESTIM) of the azimuth signal, has two steps: first, a set of finite impulse response(FIR) filter banks based on a fractional Fourier transform(FrFT) is used to separate multiple targets within a range gate; second, a cross-correlation spectrum weighted subspace fitting(CSWSF) algorithm is applied to each of the separated signals in order to estimate their respective parameters. As verified through computer simulation with the constellations of Cartwheel, Pendulum and Helix, this proposed time-frequency-subspace method effectively improves the estimation precision of the cross-range velocities of multiple targets. | Li Chenlei Liu Mei Zhao Bowen Zhang Lei | 2014 | Chinese Journal of Aeronautics2014，27，5： | 0 |
| 5 | Technical challenges for high-frequency wireless communication显示文摘Recent rapid developments in 4G wireless communication have been motivated by breakthroughs in air interface technology,exemplified by the replacement of WCDMA(Wideband Code Division Multiple Access)with OFDM(Orthogonal Frequency-division Multiplexing).Although the protocol to adopt for 5G HF(High-Frequency)wireless communication-including such matters as waveform,network deployment,and frequency range-has been a controversial issue for a number of years,a common view is that there is a large gap between the rapidly increasing requirements pertaining to traffic capacity and the capabilities of current LTE(Long Term Evolution)networks in terms of spectral and power efficiency.A number of technical challenges need to be overcome in order to bridge this gap.In this paper,by briefly reviewing progress in HF technology,we summarize technical challenges ranging from propagation attenuation and the implementation of circuit devices,to signal processing and the Ka-band to offer feasible reflection on the forthcoming technological revolution. | ZHAO Jianping LI Chenlei LI Xianghua SHEN Long | 2016 | Journal of Communications and Information Networks2016，1，2： | 0 |
| 6 | Reactive ball-milling synthesis of Co-Fe bimetallic catalyst for efficient hydrogenation of carbon dioxide to value-added hydrocarbons显示文摘Catalytic hydrogenation of CO_(2) using renewable hydrogen not only reduces greenhouse gas emissions,but also provides industrial chemicals.Herein,a Co-Fe bimetallic catalyst was developed by a facile reactive ball-milling method for highly active and selective hydrogenation of CO_(2) to value-added hydrocarbons.When reacted at 320℃,1.0 MPa and 9600 mL h^(-1) g_(cat)^(-1),the selectivity to light olefin(C_(2)^(=)-C_(4)^(=)) and C_(5)+ species achieves 57.3% and 22.3%,respectively,at a CO_(2) co nversion of 31.4%,which is superior to previous Fe-based catalysts.The CO_(2) activation can be promoted by the CoFe phase formed by reactive ball milling of the Fe-Co_(3)O_(4) mixture,and the in-situ Co_(2)C and Fe_(5)C_(2) formed during hydrogenation are beneficial for the C-C coupling reaction.The initial C-C coupling is related to the combination of CO species with the surface carbon of Fe/Co carbides,and the sustained C-C coupling is maintained by self-recovery of defective carbides.This new strategy contributes to the development of efficient catalysts for the hydrogenation of CO_(2) to value-added hydrocarbons. | Haipeng Chen Chenwei Wang Mengyang Zheng Chenlei Liu Wenqiang Li Qingfeng Yang Shixue Zhou Xun Feng | 2023 | Journal of Energy Chemistry2023，，9： | 0 |
| 7 | Confined synthesis of MoS_(2) with rich co-doped edges for enhanced hydrogen evolution performance显示文摘Activating MoS_(2) with atomic metal doping is promising to harvest desirable Pt-matched hydrogen evolution reaction(HER)catalytic performance.Herein,we developed an efficient method to access edgerich lattice-distorted MoS_(2) for highly efficient HER via in-situ sulphuration of atomic Co/Mo species that were well-dispersed in a formamide-derived N-doped carbonaceous(f-NC)substrate.Apart from others,pre-embedding Co/Mo species in f-NC controls the release of metal sources upon annealing in S vapor,grafting the as-made MoS_(2) with merits of short-range crystallinity,distorted lattices,rich defects,and more edges exposed.The content of atomic Co species embedded in MoS_(2) reaches up to 2.85 at.%,and its atomic dispersion has been systematically confirmed by using XRD,HRTEM,XPS,and XAS characterizations.The Co-doped MoS_(2) sample exhibits excellent HER activity,achieving overpotentials of 67 and155 m V at j=10 m A cm^(-2) in 1.0 M KOH and 0.5 M H_(2)SO_(4),respectively.Density functional theory simulations suggest that,compared with free-doping MoS_(2),the edged Co doping is responsible for the significantly improved HER activity.Our method,in addition to providing reliable Pt-matched HER catalysts,may also inspire the general synthesis of edge-rich metal-doped metal chalcogenide for a wide range of energy conversion applications. | Zongge Li Chenlei Li Jianwen Chen Xu Xing Yaqun Wang Ying Zhang Miaosen Yang Guoxin Zhang | 2022 | Journal of Energy Chemistry2022，31，7： | 0 |
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