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A novel synthesis of Nb_(2)O_(5)@rGO nanocomposite as anode material for superior sodium storage

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Chinese Chemical Letters 2021年第3期32卷 1144-1148页

作者： Yu Zhang Li Fang Wang Sun Bin Shi Xiaotao Chen Yujie Gu kunpeng Ding Zhenhua Wang Kening Sun Beijing Key Laboratory for Chemical Power Source and Green Catalysis School of Chemistry and Chemical EngineeringBIT-QUB Joint Center on Novel Energy and Materials ResearchBeijing Institute of TechnologyBeijing 100081China State Key Laboratory of Advanced Chemical Power Sources Guizhou Meiling Power Sources Co.Ltd.Zunyi 563003China Yinlong Energy Co. Ltd.Zhuhai 519000China

The development of novel anode materials,with superior rate capability,is of utmost significance for the successful realization of sodium-ion batteries(SIBs).Herein,we present a nanocomposite of Nb_(2)O_(5)and reduced graphene oxide(rGO)by using hydrothermal-assisted microemulsion *** water-in-oil microemulsion formed nanoreactors,which restrained the particle size of Nb_(2)O_(5)and shortened the diffusion length of ***,the rGO network prevented agglomeration of Nb_(2)O_(5)nanoparticles and improved electronic ***,Nb_(2)O_(5)@rGO nanocomposite is employed as anode material in SIBs,delivering a capacity of 195 mAh/g after 200 charge/discharge cycles at 0.2 A/***,owing to conductive rGO network,the Nb_(2)O_(5)@rGO electrode rende red a specific capacity of 76 mAh/g at high current density of 10 A/g and maintained 98 mAh/g after 1000 charge/discharge cycles at 2 A/*** Nb_(2)O_(5)@rGO electrode material prepared by microemulsion method shows promising possibilities for application of SIBs.

关键词： Nb_(2)O_(5)@rGO nanocomposite Microemulsion Anode material Sodium-ion battery

Design and parameters optimization for cutting-conveying mechanism of ramie combine harvester

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International Journal of Agricultural and Biological Engineering 2020年第6期13卷 94-103页

作者： Jicheng Huang kunpeng Tian Cheng Shen Bin Zhang Haolu Liu Qiaomin Chen Xianwang Li Aimin Ji Nanjing Institute of Agricultural Mechanization Ministry of Agriculture and Rural AffairsNanjing 210014China College of Mechanical and Electrical Engineering Hohai UniversityChangzhou 213022JiangsuChina School of Mechanical Engineering Southeast UniversityNanjing 211189China

In order to solve the problems of uneven stubble,low cutting efficiency and frequent breaking and blocking in the cutting and conveying links of ramie combine harvester,a reciprocating double movable blades cutter and a double-layer chain conveyor were designed,and the operating parameter test and optimization were carried out by using the central combination test design theory,with the emphasis on the influence of the forward speed,the cutting speed of the cutter and the conveying speed of the chain on the cutting efficiency,the failure rate and the conveying rate,and the multi-objective optimization was carried out based on these response ***,the structure and operating parameters of the cutting-conveying mechanism of ramie combine were ***,the experiment was designed by the quadratic orthogonal rotation combination test method,and the data is processed by *** regression mathematical model of cutting efficiency,failure rate and conveying rate was established and variance analysis was carried *** analyzing the effect of interaction of various factors on cutting efficiency,failure rate and conveying rate by response surface methodology,and performing multi-objective optimization on the regression model according to the importance of the optimization target,the optimal combination of the operating parameters of the cutting-conveying parts of the ramie combine harvester was obtained:when the forward speed was 0.85 m/s,the cutting speed was 1.40 m/s,and the chain conveying speed was 1.33 m/s,the cutting efficiency and conveying rate were the maximum and the failure rate was the minimum,with the values of 44.36 plants/s,93.60%and 4.16%,*** optimized parameters were verified in the field on the ramie combine *** the field test,the cutting efficiency,conveying rate,and failure rate were 43.80 plants/s,92.45%,and 4.52%,respectively,and the relative errors with the optimized values were 1.3%,1.2%,and 8.7%,respec

关键词： ramie harvester operating parameters multi-objective optimization response surface

Non-layered InSe nanocrystalline bulk materials with ultra-low thermal conductivity

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Journal of Materiomics 2024年第2期10卷 448-455页

作者： Yifei Liu Tian-Ran Wei Jiangtao Wu Hexige Wuliji Haoran Huang Zhengyang Zhou kunpeng Zhao Jie Ma Xun Shi State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Key Laboratory of Artificial Structures and Quantum Control School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China

Exploring new prototypes for a given chemical composition is of great importance and interest to several *** a famous semiconducting binary compound,InSe usually exhibits a two-dimensional layered structure with decent physical and mechanical ***,it is less noticed that InSe can also adopt a monoclinic structure,denoted as *** synthesis of such a phase usually re-quires high-pressure conditions,and the knowledge is quite scarce on its chemical bonding,lattice dynamics,and thermal *** in this work,by developing a facile method combining me-chanical alloying and spark plasma sintering,we successfully synthesize mcl-InSe bulks with well-crystallized *** chemical bonding of mcl-InSe is understood as compared with layered InSe via charge *** cut-off frequencies of acoustic phonons and several low-lying optical modes are ***,mcl-InSe exhibits a low room-temperature thermal conductivity of 0.6 W·m^(-1)·K^(-1),which is smaller than that of other materials in the IneSe system and many other ***-temperature thermal analyses corroborate the role of nanograin boundaries and low-frequency optical phonons in scattering acoustic *** work provides new insights into the non-common prototype of the InSe binary compound with potential applications in thermoelectrics or thermal insulation.

关键词： Monoclinic InSe Chemical bond Nano grains Thermal transport

Effects of film-stalk spaced dual mulching system on corn growth and yield

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Journal of Arid Land 2024年第12期16卷 1714-1729页

作者： CAO Jinjun SUN Yaqi PENG Shuili LI Wanxing HE Xiaobing LI Xiaoxia LI Dan JIN kunpeng YANG Yi LIU Yongzhong Shanxi Agricultural University/Shanxi Academy of Agricultural Sciences Millet Research InstituteChangzhi 046011China College of Agriculture Shanxi Agricultural University(Institute of Crop Science)Taigu 030801China Shanxi Agricultural Machinery Development Center Taiyuan 030002China

Film-stalk spaced dual mulching is a new type of cultivation measure that is increasingly highlighted in semi-arid areas in *** its potential,there is limited understanding of how different mulching materials affect both soil quality and crop yield in these *** address this gap,we conducted a two-year(2020-2021)field experiment in central China to explore the yield-enhancing mechanisms and assess the impact of various mulching materials on soil and corn *** experiment comprised six treatments,i.e.,plastic film-whole stalk spaced mulching in fall(PSF),plastic film-whole stalk spaced mulching in spring(PSS),black and silver plastic film-whole stalk spaced mulching in spring(BPSS),biodegradable film-whole stalk spaced mulching in spring(BSS),liquid film-whole stalk spaced mulching in spring(LSS),and non-mulching cultivation(CK).Results revealed that BPSS demonstrated the most significant yield increase,surpassing CK by a notable 10.0%and other mulching treatments by 2.4%-5.9%.The efficacy of BPSS lied in its provision of favorable hydrothermal conditions for corn cultivation,particularly during hot *** cooling effect facilitated the establishment of optimal temperature conditions relative to transparent mulching,leading to higher root growth indices(e.g.,length and surface area),as well as higher leaf photosynthetic rate and dry matter accumulation per ***,BPSS maintained higher average soil moisture content within 0-100 cm depth compared with biodegradable mulching and liquid *** a result,BPSS increased activities of urease,catalase,and alkaline phosphatase,as well as the diversity and abundance of soil bacteria and fungi in the rhizosphere zone of corn,facilitating nutrient accessibility by the *** findings suggest that selecting appropriate mulching materials is crucial for optimizing corn production in drought-prone areas,highlighting the potential of BPSS cultivation.

关键词： film-stalk spaced dual mulching black plastic film cover corn yield conservational tillage system

空间无人系统智能精准运维: 机制、技术与应用

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中国科学:物理学、力学、天文学 2025年第2期55卷 40-69页

作者：李文博梁寒玉刘切王坤朋刘成瑞刘文静张妍徐赫屿黄晓峰王彤叶志玲北京控制工程研究所北京100094 空间智能控制技术全国重点实验室北京100094 南京航空航天大学自动化学院南京211106 重庆大学自动化学院重庆400044 西南科技大学信息工程学院绵阳621010 北京空间飞行器总体设计部北京100094

运维技术是地球轨道卫星、深空探测器、高超声速飞行器、地外天体巡视器等空间无人系统实现安全可靠稳定运行的重要保障.针对现有远程集中运维方式存在的执行效率偏低、精准程度不高等问题,本文提出了一种支持隐私保护的分布式云边协同... 详细信息

运维技术是地球轨道卫星、深空探测器、高超声速飞行器、地外天体巡视器等空间无人系统实现安全可靠稳定运行的重要保障.针对现有远程集中运维方式存在的执行效率偏低、精准程度不高等问题,本文提出了一种支持隐私保护的分布式云边协同运维机制,为解决“资源配置不充分、先验知识不完备、信息交互不安全”等挑战提供了一种有效途径.在此基础上,同时关注“数据、模型与算法”人工智能技术的三大核心要素,重点针对数据增强、状态监测、异常检测、故障诊断、健康评估、寿命预测等空间无人系统智能精准运维6项关键核心技术的研究现状与应用情况进行了汇总与梳理.最后,结合未来航天型号任务需求以及人工智能技术发展态势,对空间无人系统智能精准运维技术未来可能的发展趋势进行了分析与展望.

关键词：空间无人系统智能精准运维云边协同机制隐私保护

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考虑5G基站备用储能优化调控的配电网重构双层优化方法

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电工技术学报 2024年第16期39卷 5028-5041页

作者：麻秀范张乐萱于琨澎杨璐华北电力大学电气与电子工程学院北京102206

5G基站建设数量激增带来的大量负荷影响了配电网的运行经济性,但基站备用储能在保证可靠性的动态备电前提下能够参与削峰填谷,如何利用配电网重构和储能调控提高双方运行经济性亟待研究。该文首先分析了5G基站备用储能的调控潜力,建立... 详细信息

5G基站建设数量激增带来的大量负荷影响了配电网的运行经济性,但基站备用储能在保证可靠性的动态备电前提下能够参与削峰填谷,如何利用配电网重构和储能调控提高双方运行经济性亟待研究。该文首先分析了5G基站备用储能的调控潜力,建立了基站储能可调控容量模型。针对配电网不同拓扑结构的节点可靠性,利用序贯蒙特卡洛法进行评估,提出了考虑节点可靠性的基站储能备电时长确定方法。在此基础上,构造了考虑5G基站备用储能优化调控的配电网重构双层优化模型。通过算例说明,该文提出的重构模型考虑了基站备用储能削峰填谷,使配电网运行经济性更高;重构提高了节点的可靠性,使基站储能拥有更大的调控空间,有效地降低了基站运行成本,实现了双方的互利共赢。

关键词： 5G基站备用储能配电网重构可靠性

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具备跨区协同的接地线全流程管控系统研究

电气技术 2025年第1期26卷 69-74页

作者：杨迎春王少鹏张航王鹍鹏李晨阳许昌许继软件技术有限公司河南许昌461000

接地线是保证电力作业人员人身安全的重要设备。传统的接地线缺乏信息化、智能化管理手段,接地线的提取、归还无闭环管理手段,容易出现错挂、漏挂、漏还等情况,给电网的安全稳定运行带来巨大风险。本文对接地线、接地线柜、接地桩进行... 详细信息

接地线是保证电力作业人员人身安全的重要设备。传统的接地线缺乏信息化、智能化管理手段,接地线的提取、归还无闭环管理手段,容易出现错挂、漏挂、漏还等情况,给电网的安全稳定运行带来巨大风险。本文对接地线、接地线柜、接地桩进行物联化、智能化改造,设计涵盖“云管边端”的接地线全流程管控系统架构,研发接地线全流程管控系统和智能监测装置。通过边缘物联代理跨区同步方式实现接地线、接地线柜、接地桩实时状态及业务数据在安全Ⅳ区和互联网区的协同一致,基于数据跨区同步实现接地线数据跨区采集和全景监视,保证接地线精准挂接,提高现场运检人员的安全性和工作效率,为电网的安全稳定运行提供保障。

关键词：接地线边缘物联代理跨区协同数据跨区采集全景监视

Understanding the Correlations between Social Attention and Topic Trends of Scientific Publications

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Journal of Data and Information Science 2016年第1期1卷 28-49页

作者： Xianlei Dong Jian Xu Ying Ding Chenwei Zhang kunpeng Zhang Min Song School of Management Science and Engineering Shandong Normal University School of Information Management Sun Yat-sen University Department of Information and Library Science Indiana University Department of Information and Decision Sciences University of Illinois at Chicago Department of Library and Information Science Yonsei University

Purpose： We propose and apply a simplified nowcasting model to understand the correlations between social attention and topic trends of scientific publications. Design/methodology/approach： First, topics are generated from the obesity corpus by using the latent Dirichlet allocation （LDA） algorithm and time series of keyword search trends in Google Trends are obtained. We then establish the structural time series model using data from January 2004 to December 2012, and evaluate the model using data from January 2013. We employ a state-space model to separate different non-regression components in an observational time series （i.e. the tendency and the seasonality） and apply the ＂spike and slab prior＂ and stepwise regression to analyze the correlations between the regression component and the social media attention. The two parts are combined using Markov-chain Monte Carlo sampling techniques to obtain our results. Findings： The results of our study show that （1） the number of publications on child obesity increases at a lower rate than that of diabetes publications; （2） the number of publication on a given topic may exhibit a relationship with the season or time of year; and （3） there exists a correlation between the number of publications on a given topic and its social media attention, i.e. the search frequency related to that topic as identified by Google Trends. We found that our model is also able to predict the number of publications related to a given topic.

关键词： First we study a correlation rather than causality between topics'trends and social media. As a result the relationships might not be robust so we cannot

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渤中19-6油田井漏治理技术的优化及应用

天津科技 2025年第1期52卷 83-86页

作者：陈昆鹏刘东鑫于庆川何斌童志明中海油田服务股份有限公司油田化学事业部天津300450

渤中19-6凝析气田开发项目在第三系地层钻遇多套复杂薄弱性地层。地质条件复杂主要表现为由构造运动形成的断层型漏失,层位以东营组为主,发生严重漏失时往往为多种漏失特征同发,窄密度窗口和多套压力系统并存的情况也影响着井下作业安... 详细信息

渤中19-6凝析气田开发项目在第三系地层钻遇多套复杂薄弱性地层。地质条件复杂主要表现为由构造运动形成的断层型漏失,层位以东营组为主,发生严重漏失时往往为多种漏失特征同发,窄密度窗口和多套压力系统并存的情况也影响着井下作业安全。对渤中19-6凝析气田开发项目中钻遇的漏失特点和难点进行分析,剖析区域漏失的特点及归纳井漏治理过程中的规律性认识,提出基于“预防为主、防堵结合、科学治理、高效堵漏”理念的措施,并在井漏治理现场成功应用,对于提高该区域的作业效率和保障生产安全具有积极意义。

关键词：渤中19-6 井漏治理断层发育窄密度窗口