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Fast sulfurization of nickel foam-supported nickel-cobalt carbonate hydroxide nanowire array at room temperature for hydrogen evolution electrocatalysis

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ELECTROCHIMICA ACTA 2019年 318卷 252-261页

作者： Lu, Wangting li, xuwen Wei, Feng Cheng, Kun li, Wenhui Zhou, Youhua Zheng, Wanquan Pan, Lei Zhang, Geng Jianghan Univ Inst Interdisciplinary Res Wuhan 430056 Hubei Peoples R China Jianghan Univ Sch Chem & Environm Engn Wuhan 430056 Hubei Peoples R China Univ Paris Saclay Univ Paris Sud Inst Sci Mol Orsay CNRS F-91405 Orsay France Jianghan Univ Sch Life Sci Wuhan 430056 Hubei Peoples R China Huazhong Agr Univ Coll Sci Dept Chem Wuhan 430070 Hubei Peoples R China

Transition metal sulfide is considered as a kind of promising noble metal-free material for hydrogen evolution reaction (HER). However, most of conventional sulfurization methods require high temperature and/or long reaction time. Herein, a sulfurization strategy at room temperature (25 degrees C) by using Na2S in aqueous solution is applied to sulfurize nickel foam-supported nickel-cobalt carbonate hydroxide nanowire array, during which amorphous sulfide gradually forms on the surface of nanowire and finally replaces the nanowire completely. It is found that the electrode sulfurized for 5 min in which only a thin sulfide layer is formed presents nearly identical catalytic performance for HER with the electrode that is sufficiently sulfurized for 120 min. The electrode sulfurized at 25 degrees C for 5 min only needs an overpotential of 100 mV to achieve hydrogen evolution current at 10 mA cm(-2) in 1 M KOH, and negligible loss of activity is observed after working at a current density of 20 mA cm(-2) for 25 h. The interface between carbonate hydroxide and sulfide is considered to play an important role in the catalysis of HER. The observation in this work can provide new insights into the sulfurization process and the role of sulfide in the process of HER. (C) 2019 Elsevier Ltd. All rights reserved.

关键词： HER Sulfide Amorphous Interface DFT

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一针法小切口重睑术的临床应用效果评价

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中国医疗美容 2024年第9期14卷 14-17页

作者：韩志强杜梦雨徐树岑田丽葛玉瑶李旭文徐静蚌埠医科大学第一附属医院整形烧伤科安徽蚌埠233000

目的探讨一针法小切口重睑术的临床应用。方法选取2023年1月至2024年1月于蚌埠医科大学第一附属医院接受重睑术的60例(120眼)患者行回顾性分析。其中30例接受一针法小切口重睑术,30例接受全切重睑术。比较两组患者的手术时间、患者满... 详细信息

目的探讨一针法小切口重睑术的临床应用。方法选取2023年1月至2024年1月于蚌埠医科大学第一附属医院接受重睑术的60例(120眼)患者行回顾性分析。其中30例接受一针法小切口重睑术,30例接受全切重睑术。比较两组患者的手术时间、患者满意度和并发症。结果观察组患者手术时间(22.07±2.92)min,低于对照组(63.40±5.90)min,差异有统计学学意义(P<0.001)。观察组患者非常满意90.0%(27/30),满意6.7%(2/30),不满意3.3%(1/30);对照组患者非常满意93.3%(28/30),满意6.7%(2/30)。两组患者满意度比较差异无统计学意义(P>0.05)。观察组患者术后并发症发生率为10.0%(3/30),低于对照组20.0%(6/30),但差异无统计学意义(P>0.05)。结论一针法小切口重睑术手术时间短、创伤小、瘢痕不明显,满意度高,适合手术初学者,值得在临床推广。

关键词：一针法小切口微创:重睑术

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Heterogeneous temporal graph powered DRL algorithm for channel allocation in Maritime IoT Systems

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COMPUTER COMMUNICATIONS 2024年 213卷 260-270页

作者： li, Zongwang Xie, Zhuochen He, Xiaohe liang, xuwen Chinese Acad Sci Innovat Acad Microsatellites 1 Xueyang Rd Shanghai 201304 Peoples R China Univ Chinese Acad Sci 1 Yanqihu East Rd Beijing 101408 Peoples R China

In actual maritime Internet of Things systems, the communication environment is characterized by its time-varying nature and the presence of highly heterogeneous network structures. Those attributes present considerable challenges in devising resource allocation strategies. Given the limited availability of frequency resources, designing a reasonable and flexible channel allocation strategy (CAS) is the primary task for meeting diverse and dynamic communication demands. In this paper, a heterogeneous temporal graph powered deep reinforcement learning algorithm is proposed to optimize the CAS to maximize the channel efficiency in a real-world maritime Internet of Things system. Specifically, we build relation-based heterogeneous edges to connect different types of terminal nodes and adopt a time encoding technology to capture the dynamic evolution of communication scenarios over time. The memory and public mailbox modules are constructed as the implementation entities of the information aggregation method based on the attention mechanism. In addition, we develop a corresponding heterogeneous temporal neural network to estimate the real-time resource requirements of target terminals, and subsequently learn the optimal CAS based on the deep reinforcement learning algorithm from the perspective of maximizing the cumulative channel efficiency. Simulation results prove that the proposed algorithm significantly outperforms the other state-of-the-art algorithms in terms of the channel efficiency and generalization ability.

关键词： Maritime IoT Heterogeneous temporal graph Deep reinforcement learning

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Software Design of Hardware-in-the-loop Simulation System Based on RapidIO 19

Software Design of Hardware-in-the-loop Simulation System Ba...

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Proceedings of the 2019 8th International Conference on Computing and Pattern Recognition

作者： xuwen li Jiashun Hu Xuegang Wu Qiang Wu Beijing University of Technology College of Life Science and Bioengineering Beijing China Beijing University of Technology Department of Informatics Beijing China Beijing University of Technology Information Department Beijing China

ISBN: (纸本)9781450376570

At present, Rapid IO has been widely used in embedded platforms due to its high transmission efficiency and low transmission delay, making the software of the embedded platform a new speed. Windows system has the advantages of friendly interface, wide user base, easy maintenance and upgrade, etc., which has received extensive attention in the industry, but the real-time performance is poor and it is impossible to directly communicate with the embedded processor directly through Rapid IO, which makes it impossible to become a semi-physical simulation system. Therefore, the TSI721 driver development based on the RTX environment is designed. The internal structure of Rapid IO protocol, RTX real-time subsystem and Tsi721 switch chip is briefly described. Detailed description of the development framework and interface design of the Tsi721Pcie driver, the main process of RTX driver development. Experiments verify that PCIe and RTX drivers are stable, reliable, and capable of completing tasks in real time.

关键词： Rapid IO Tsi721 RTX PCIE Driver

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Cobalt-decorated 3D hybrid nanozyme: A catalytic amplification platform with intrinsic oxidase-like activity

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ELECTROCHIMICA ACTA 2021年 395卷 139197-139197页

作者： Lu, Nannan Yan, Xiaoyi Gu, Yue Zhang, Tingting liu, Yu Song, Yu Xu, Zhiqian Xing, Yue li, xuwen Zhang, Zhiquan Zhai, Shengyong Jilin Univ Coll Chem Changchun 130012 Peoples R China Anhui Univ Chinese Med Sch Pharm Hefei 230013 Peoples R China Qingdao Univ Qingdao Canc Inst Qingdao 266071 Peoples R China Changchun Univ Chinese Med Jilin Ginseng Acad Changchun 130117 Peoples R China

Research about constructing multi-dimensional carbon nanomaterials is of great significance in electrocatalytic and sensing fields in order to integrate structural merits of each individual unit. Also, nano-materials with enzyme-like activities are prospective candidates for artificial enzyme design and electrochemical application. Herein, we fabricate Co, N co-doped hierarchical hybrid (Co@NCNTs/NC) nanozyme, which integrates of both N-doped carbon nanotubes (NCNTs) and N-doped carbon sheets (NC). The three-dimensional (3D) porous carbon composite is prepared by thermal treatment of metal-organic framework (MOF) which was synthesized by growing of ZIF-67 on ZIF-L at room temperature. The obtained nanomaterial not only possesses an improved oxidase-like activity that can catalyze 3,3',5,5'-tetramethylbenzidine (TMB) in the absence of hydrogen peroxide (H2O2), but also constructs a signal amplification platform towards dopamine (DA) due to the synergistic catalysis of Co species and N-doped porous carbon architecture. The electrocatalytic performance for DA detection shows a broad linear range from 30 nM to 710 mu M and a detection limit of 9 nM. The Co@NCNTs/NC/GCE is employed to practically detect DA in human serum and artificial cerebrospinal fluid (aCSF) samples with satisfactory results. The present work exhibits a great promising in colorimetric and electrochemical sensing fields and presents a new sight for the fabrication of MOF-derived nanozyme. (C) 2021 Elsevier Ltd. All rights reserved.

关键词： Metal-organic frameworks Oxidase-like activity Nanozyme Electrochemical sensing Dopamine

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Intelligent Spectrum Sharing Strategy for Integrated Satellite-Maritime Heterogeneous Mobile Networks

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2024年第5期73卷 6780-6794页

作者： Wu, Ruiwen li, Zongwang Xie, Zhuochen liang, xuwen Univ Chinese Acad Sci Beijing 100049 Peoples R China Shanghai Innovat Acad Microsatellites Shanghai 201304 Peoples R China Shanghai Engn Ctr Microsatellites Shanghai 201210 Peoples R China

Spectrum sharing is a pivotal technology for integrated satellite-maritime network to improve spectrum efficiency. However, the majority of existing spectrum sharing approaches relied on time-frequency multiplexing to circumvent or suppress interference, and often overlooked the problem of incomplete observability and interference present in heterogeneous systems. This limitation hindered overall system throughput improvements. In this article, an intelligent spectrum sharing strategy for integrated satellite-maritime heterogeneous mobile networks is firstly proposed. This strategy aims to operate co-frequency communication transmissions within the interference constraints, as derived from protocols and standards of International Telecommunication Union (ITU), to maximize the overall system throughput and spectral efficiency. Furthermore, considering the limitation that the satellite cannot fully observe channel statuses, we model the spectrum sharing process as a Partially Observable Markov Decision Process (POMDP). We employ an algorithm architecture that combines Dueling Deep Q-learning Network (DQN) and Double DQN to address this challenge, which enables satellites to efficiently evaluate the value of all channel allocation actions, thereby enhancing decision-making accuracy and algorithm convergence speed. Simulation results validate the superiority of our proposed strategy over compared methods in terms of throughput and stability.

关键词： Satellites Throughput Marine vehicles Interference Satellite broadcasting Optimization ITU Satellite-maritime heterogeneous mobile networks spectrum sharing interference constraints partially observable Markov decision process (POMDP) double dueling deep Q-learning network (DQN)

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A Multi-model Object Tracking Algorithm based on Texture and Color Features 19

A Multi-model Object Tracking Algorithm based on Texture and...

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Proceedings of the 2019 8th International Conference on Computing and Pattern Recognition

作者： xuwen li Wendong Xue liJuan Shi Qiang Wu Beijing University of Technology College of Life Science and Bioengineering Beijing China Beijing University of Technology Information Department Beijing China

ISBN: (纸本)9781450376570

Mean Shift is widely concerned because of its advantages like fast convergence, real-time performance and simple procedure. However, the tracking performance of the traditional Mean Shift algorithm is obviously interfered when the background has the similar color as the target or the illumination changes. Besides, the tracking is easy to defeat in the case of target occlusion and loss of important frames. Therefore, this paper proposes two improvements based on the traditional Mean Shift tracking algorithm. First, the HLBP texture feature and color feature are employed to describe the target feature in order to improve the robustness of the tracking algorithm. Second, multiple models are taken into account to provide more abundant choices for the tracking process which can improve the tacking performance. The result of experiments show that our algorithm is more robust under the case of object occlusion and posture change, and gets better performance in accuracy when the background color and target color are similar or the illumination changes.

关键词： Multi-model Object Tracking Mean Shift Color Features

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基于政策工具视角下体育助力乡村振兴的研究——以湖南省为例

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体育科技文献通报 2021年第4期29卷 71-73页

作者：李旭雯涂伟仕黎躜湖南师范大学体育学院湖南长沙410000 长沙理工大学湖南长沙410000

如何有效的促进“乡村振兴战略”的发展是国家和各省关注的重点,政府体育政策和乡村政策的颁布是解决问题、实现目标的重要手段,选择恰当的政策工具才能实现预设目标。本文选取8份湖南省层面与体育和乡村振兴相关的意见、规划、计划和... 详细信息

如何有效的促进“乡村振兴战略”的发展是国家和各省关注的重点,政府体育政策和乡村政策的颁布是解决问题、实现目标的重要手段,选择恰当的政策工具才能实现预设目标。本文选取8份湖南省层面与体育和乡村振兴相关的意见、规划、计划和纲要定为研究对象,通过建立基本政策工具X维度、体育Y维度和乡村Z维度的三维框架、确定分析单元、编码与归纳来分析各个政策的缺失与冲突,从而为体育助力乡村振兴的发展提供参考。

关键词：政策工具乡村体育农村体育乡村振兴

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Temporal assembly patterns of microbial communities in three parallel bioreactors treating low-concentration coking wastewater with differing carbon source concentrations

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Journal of Environmental Sciences 2024年第3期137卷 455-468页

作者： Weijia li Yu Xia Na li Jie Chang Jing liu Pei Wang xuwen He School of Chemical and Environmental Engineering China University of Mining and Technology-BeijingBeijing 100083China

Carbon source is an important factor of biological treatment systems, the effects of which on their temporal community assembly patterns are not sufficiently understood *** this study, the temporal dynamics and driving mechanisms of the communities in three parallel bioreactors for low-concentration coking wastewater(CWW) treatment with differing carbon source concentrations(S0 with no glucose addition, S1 with 200 mg/L glucose addition and S2 with 400 mg/L glucose addition) were comprehensively studied. Highthroughput sequencing and bioinformatics analyses including network analysis and Infer Community Assembly Mechanisms by Phylogenetic bin-based null model(iCAMP) were used. The communities of three systems showed turnover rates of 0.0029~0.0034 every 15days. Network analysis results showed that the S0 network showed higher positive correlation proportion(71.43%) and clustering coefficient(0.33), suggesting that carbon source shortage in S0 promoted interactions and cooperation of microbes. The neutral community model analysis showed that the immigration rate increased from 0.5247 in S0 to 0.6478in S2. The iCAMP analysis results showed that drift(45.89%) and homogeneous selection(31.68%) dominated in driving the assembly of all the investigated microbial *** contribution of homogeneous selection increased with the increase of carbon source concentrations, from 27.92% in S0 to 36.08% in S2. The OTUs participating in aerobic respiration and tricarboxylic acid(TCA) cycle were abundant among the bins mainly affected by deterministic processes, while those related to the metabolism of refractory organic pollutants in CWW such as alkanes, benzenes and phenols were abundant in the bins dominated by stochastic processes.

关键词： Coking wastewater treatment Temporal dynamics Network analysis Deterministic processes Stochastic processes

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A multi-model object tracking algorithm based on texture and color features 8

A multi-model object tracking algorithm based on texture and...

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8th International Conference on Computing and Pattern Recognition, ICCPR 2019

作者： li, xuwen Xue, Wendong Shi, lijuan Wu, Qiang Beijing University of Technology College of Life Science and Bioengineering Beijing China

ISBN: (纸本)9781450376570

关键词： Color

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