| 1 | A multiphase sodium vanadium phosphate cathode material for high-rate sodium-ion batteries显示文摘The unsatisfactory rate capability and poor cycling stability at high rate of sodium-ion batteries(SIBs) have impeded their practical applications. Herein, a Na_(3)V_(2)(PO_(4))_(3)/Na_(3)V_(3)(PO_(4))_(4) multiphase cathode materials for high-rate and long cycling SIBs was successfully synthesized by regulation the stoichiometric ratio of raw materials. The combined experiment and simulation results show that the multiphase materials consisted of NASICON structural phase Na3V2(PO4)3 and layered structure phase Na_(3)V_(3)(PO_(4))_(4), possess abundant phase boundaries. Electrochemical experiments demonstrate that the multiphase materials maintain a remarkable reversible capacity of 69.0 mA h g^(-1) even at an ultrahigh current density of 100 C with a high capacity retention of 81.25 % even after 10,000 cycles. Na_(3)V_(2)(PO_(4))_(3)/Na_(3)V_(3)(PO_(4))_(4) electrode exhibits a higher working voltage, superior rate capability and better cycling stability than Na_(3)V_(2)(PO_(4))_(3) electrode, which indicates that the introduction of second phase can be an effective strategy for the development of novel cathode materials for SIBs. | Chuan Wang Hai Long Lijiao Zhou Chao Shen Wei Tang Xiaodong Wang Bingbing Tian Le Shao Zhanyuan Tian Haijun Su Keyu Xie | 2021 | Journal of Materials Science & Technology2021，，7： | 1 |
| 2 | Frequency domain based super-resolution method for mixed-resolution multi-view images显示文摘Super-resolution(SR) techniques, which are based on single or multi-frame low-resolution(LR) images, have been extensively investigated in the last two decades. Mixed-resolution multiview video format plays an important role in three-dimensional television(3DTV) coding scheme. Previous work considers multiview or multi-camera images and videos at the same resolution,which performs well under the planar model without or with little projection error among the videos captured by different cameras.In recent years, several researchers have discussed the SR problem in mixed-resolution multi-view video format, where the superresolved image is created using the up-sampled version of the LR image and the high frequency components extracted from the warped image in the adjacent high-resolution(HR) views. Unfortunately, the output HR images suffer from artifacts caused by depth error. To obtain the detailed texture and edge information from the HR image as much as possible, while preserving the structure of the LR image, a novel SR reconstruction algorithm is proposed.The algorithm is composed of three components: the structure term, the detail information term, and the regularization term. The first term preserves the structure similarity of the LR image; the second term extracts detailed information from the adjacent HR image; and the last term ensures the uniqueness of the solution.Experimental results show the effectiveness and robustness of the proposed algorithm, which achieves high performance both subjectively and objectively. | Zhizhong Fu Yawei Li Yuan Li Lan Ding Keyu Long | 2016 | Journal of Systems Engineering and Electronics2016，27，6： | 0 |
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