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405 results on '"Jin, Rencheng"'

81. Study on displacement estimation in low illumination environment through polarized contrast-enhanced optical flow method for polarization navigation applications

Author

Jinkui Chu, Liyuan Zhai, Huikai Xie, Cai Hong, Jin Rencheng, Peiqi Zhang, Le Guan, and Yahong Li

Subjects
Physics, Brightness, Spectrometer, Linear polarization, business.industry, Optical flow, Polarimetry, 02 engineering and technology, 021001 nanoscience & nanotechnology, Laser, Polarization (waves), 01 natural sciences, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, law.invention, 010309 optics, Interferometry, Optics, law, 0103 physical sciences, Electrical and Electronic Engineering, 0210 nano-technology, business
Abstract

Polarization navigation techniques become more and more significant for a wide range of researches and applications. However, most of the polarization navigation sensors can only output the navigation angle information of a carrier based on the angle of polarization (AoP) from the skylight in the daytime; they cannot provide the displacement information in day and night. In this paper, a polarized contrast-enhanced (PCE) optical flow method is proposed to improve the accuracy of displacement estimation and reduce the influence of the ambient brightness. We acquire the degree of linear polarization (DoLP) images during the motion of the carrier in low illumination environment, and the hypothesis of the DoLP continuity is used for the theoretical foundation of this PCE optical flow method under the conditions of parallel light source and small displacements. The displacement calibration on the experimental platform is obtained by using a laser interferometer and spectrometer, and the contrast of the polarimetric image and the calculated polarized optical flow value are used as the validation criteria. Under 0.7198Lx illumination intensity, the cumulative error of the displacement obtained by the PCE method is less than 8 mm and the accuracy of the displacement estimation is almost 2 times higher than that of the traditional Lucas-Kanade(LK) optical flow method. Our experimental results have also shown that under 10°, 10−1, or even 10-2 levels of the standard illumination, the displacement values from the PCE optical flow method are in good agreement with the theoretical values.

Published
2020

89. Oxygen‐Vacancy Abundant NiCo2O4 on the N‐Doped Carbon Nanosheets as Anode for High Performance Lithium Ion Batteries.

Author

Jin, Rencheng, Yue, Hailong, Xia, Juan, Ren, Congying, and Gao, Shanming

Subjects
*LITHIUM-ion batteries, *NANOSTRUCTURED materials, *TRANSITION metal oxides, *NITROGEN, *ANODES, *LITHIUM ions, *CARBON
Abstract

Abstract: In this work, the oxygen‐vacancy abundant NiCo2O4 grown on the N‐doped carbon nanosheets are designed and fabricated through a facile procedure. The obtained special structure combined with the oxygen vacancies effectively enhance the contact area, keep the structural integrity as well as accelerate the electron and lithium ion transfer. As an anode for lithium ion batteries, the special architecture exhibits good cycle stability (1096 mAh g−1 after 100 cycles at current density of 200 mA g−1) and long cycle capability at high current rate (398 mAh g−1 after 500 cycles at 5000 mA g−1). The advantageous features by constructing oxygen‐vacancy abundant transition metal oxides with the conductive N‐doped carbon nanosheets may pave the way for improving the electrochemical performance. [ABSTRACT FROM AUTHOR]

Published
2021
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91. Sb Nanoparticles Anchored on Nitrogen-Doped Amorphous Carbon-Coated Ultrathin CoSxNanosheets for Excellent Performance in Lithium-Ion Batteries

Author

Jin, Rencheng, Jiang, Hua, Wang, Qingyao, Li, Guihua, and Gao, Shanmin

Abstract

Compared to single-component materials, hybrid materials with various components display superior electrochemical performance. In this work, two-dimensional CoSx@NC@Sb nanosheets assembled by ultrathin CoSxnanosheets (∼4 nm) and a thin layer of N-doped amorphous carbon (NC) combined with colloidlike Sb nanoparticles are designed and synthesized via a solvothermal route accompanied by a carbonization and Sb deposition procedure. If applied in lithium-ion batteries (LIBs), the hybrids exhibit a specific capacity of 960 mA h g–1at the 100th cycle at 0.1 A g–1. Moreover, the reversible capacity still maintains at 494 mA h g–1after 500 cycles at a high rate of 10 A g–1. All enhanced electrochemical properties of the hybrids are attributed to the synergistic effect of the two components and their unique structural features, which can effectively increase the electrical conductivity, shorten the pathway of Li+diffusion, accommodate the volume variation, and inhibit the aggregation and pulverization of the electrode. We believe that the current work can provide a new strategy for designing and fabricating high-performance anode materials for LIBs.

Published
2024
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