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Self-supported metal(Fe, Co, Ni)-embedded nitrogen-doping carbon nanorod framework as trifunctional electrode for flexible Zn-air batteries and switchable water electrolysis

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Green Energy & Environment 2023年第6期8卷 1644-1653页

作者： qiuyan jin Liping Xiao Weidong He Hao Cui Chengxin Wang State Key Laboratory of Optoelectronic Materials and Technologies School of Materials Science and EngineeringSun Yat-sen UniversityGuangzhou510275China The Key Laboratory of Low-Carbon Chemistry&Energy Conservation of Guangdong Province Sun Yat-sen UniversityGuangzhou510275China

To meet the practical demand of wearable/portable electronics, developing high-efficiency and durable multifunctional catalyst and in-situ assembling catalysts into electrodes with flexible features are urgently needed but challenging. Herein, we report a simple route to fabricate bendable multifunctional electrodes by in-situ carbonization of metal ion absorbed polyaniline precursor. Alloy nanoparticles encapsulated in graphite layer are uniformly distributed in the N-doping carbon nanorod skeleton. Profiting from the favorable free-standing structure and the cooperative effect of metallic nanoparticles, graphitic layer and N doped-carbon architecture, the trifunctional electrodes exhibit prominent activities and stability toward HER, OER and ORR. Notably, due to the protection of carbon layer, the electrocatalysts show the reversible catalytic HER/OER properties. The overall water splitting device can continuously work for 12 h under frequent exchanges of cathode and anode. Importantly, the bendable metal air batteries fabricated by self-supported electrode not only displays the outstanding battery performance,achieving a decent peak power density(125 mW cm^(-2)) and exhibiting favorable charge-discharge durability of 22 h, but also holds superb flexible stability. Specially, a lightweight self-driven water splitting unit is demonstrated with stable hydrogen production.

关键词： Trifunctional catalysts Self-supported electrodes Switchable water splitting Flexible Zn-air battery Self-powered system

Hierarchical assembly of uranyl metallacycles involving macrocyclic hosts

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Chinese Chemical Letters 2022年第7期33卷 3539-3542页

作者： Yuanyuan Liang Lei Mei qiuyan jin Junshan Geng jingyang Wang Kang Liu Kongqiu Hu Jipan Yu Weiqun Shi Laboratory of Nuclear Energy Chemistry Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Actinide metallacycles are an emerging class of functional coordination assemblies,but multi-level assembly from metallacycle units toward hierarchical supramolecular structures are still rarely investigated.In this work,we put forward a novel supramolecular inclusion-based method through introducing two macrocyclic hosts,cucurbit[7]uril(CB[7])and cucurbit[8]uril(CB[8])to facilitate hierarchical assembly of uranyl metallacycles with higher complexity,and successfully prepare two different kinds of uranyl metallacycle-based complexes with intriguing hierarchical structures,a CB[7]-based four-member molecular necklace([4]MN)and a CB[8]-involved ring-in-ring supramolecular polymer chain.The results obtained here prove the feasibility of supramolecular inclusion for regulating coordination assembly of uranyl metallacycles and related hierarchical structures.It is believed that this method can be used to achieve the construction of actinide coordination assemblies with higher structural complexity.

关键词： Metallacycle Coordination self-assembly Uranyl Cucurbituril Hierarchical structure Molecular necklace

滚仰式导引头斜置方案下的过顶奇异问题控制策略

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兵工学报 2024年第2期45卷 628-640页

作者：金秋延刘福祥王新春刘晓莫波北京理工大学宇航学院北京100081 北京航天自动控制研究所北京100070 北京航天长征飞行器研究所北京100048

在末制导阶段,由于制导目标位于弹体纵轴附近,滚仰式结构的导引头易出现奇异性问题而难以精确跟踪目标。针对上述问题,提出基于斜置方案的滚仰式导引头过顶奇异问题控制策略。在导引头稳定平台相对弹体斜置边界俯仰框架角的基础上,通过... 详细信息

在末制导阶段,由于制导目标位于弹体纵轴附近,滚仰式结构的导引头易出现奇异性问题而难以精确跟踪目标。针对上述问题,提出基于斜置方案的滚仰式导引头过顶奇异问题控制策略。在导引头稳定平台相对弹体斜置边界俯仰框架角的基础上,通过控制弹体的滚转运动,保证导引头光轴始终避开过顶奇异区域,实现目标位于弹体纵轴附近和斜置导引头初始光轴附近两个过顶奇异区域的稳定跟踪。研究结果表明:所提策略相比于增设第三轴的方法,导引头体积小、质量轻;相比于分区域变参数控制策略,解决了静止和减速控制时过顶奇异区域内导引头对视线角速度跟踪失效的问题;仿真对比结果验证了所提策略具有跟踪精确度高、有效抑制控制系统失稳、降低探测器失调角的特点。

关键词：斜置导引头过顶奇异问题滚仰式导引头滚转弹

认知参与型身体活动对发展儿童青少年执行功能的效果:基于ICF的系统综述

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中国康复理论与实践 2024年第1期30卷 44-53页

作者：闻嘉宁金秋艳张琦李杰司琦浙江大学教育学院体育学系浙江杭州市310058 北京体育大学心理学院北京市100084 杭州师范大学附属医院认知与脑疾病研究中心浙江杭州市311121 杭州师范大学心理科学研究院浙江杭州市311121

目的系统评价认知参与型身体活动(CEPA)对儿童青少年执行功能的干预效果。方法检索Web of Science、PubMed、Medline、EBSCO和中国知网等自建库至2023年11月30日的中、英文文献。根据纳入排除标准筛选出符合要求的文献,并对其做质量评... 详细信息

目的系统评价认知参与型身体活动(CEPA)对儿童青少年执行功能的干预效果。方法检索Web of Science、PubMed、Medline、EBSCO和中国知网等自建库至2023年11月30日的中、英文文献。根据纳入排除标准筛选出符合要求的文献,并对其做质量评价后进行系统综述。结果最终纳入15篇文献,发表于2014年至2023年之间,来自8个国家,涉及1806例年龄在4~16岁的研究对象。PEDro量表评分平均为6.6分。纳入分析的CEPA干预运动强度为64%~93%HRmax,单次干预的持续时间10~60 min,干预频率为每周2~5次,干预周期为4~24周。CEPA的具体形式包括结合认知任务的足球、篮球和地板球,结合认知任务的跑、跳、蹲、坐、旋转和保持平衡,以及结合认知任务的体感游戏。纳入的15项研究中有11项在执行功能的至少1种成分上表现出积极效果,但涉及工作记忆的7项研究有6项未能验证积极效应。在12项对比分析CEPA和身体活动或常规体育课的干预效果差异研究中,有9项发现CEPA对执行功能的干预效果更佳。结论CEPA对儿童青少年的认知灵活性有积极影响,对抑制控制的影响有争议,而对工作记忆的影响未得到验证。CEPA的干预类型分为结合认知任务的球类运动、基本动作技能训练和体感游戏。

关键词：儿童青少年执行功能认知参与型身体活动系统综述

The Exact Solution of the Space-Time Fractional Modified Kdv-Zakharov-Kuznetsov Equation

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Journal of Applied Mathematics and Physics 2017年第4期5卷 844-852页

作者： qiuyan jin Tiecheng Xia jinbo Wang Department of Mathematics Shanghai University Shanghai China Science and Technology on Communication Security Laboratory Chengdu China

In this paper, we get many new analytical solutions of the space-time nonlinear fractional modified KDV-Zakharov Kuznetsov (mKDV-ZK) equation by means of a new approach namely method of undetermined coefficients based on a fractional complex transform. These solutions have physics meanings in natural sciences. This method can be used to other nonlinear fractional differential equations.

关键词： Analytical Solutions the Space-Time Fractional Modified KDV-ZK Equation Nonlinear Fractional Differential Equation Modified Riemann-Liouville Derivative

Behavior modeling on the PIM performance in connectors using FEA method and circuit simulation

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The Journal of China Universities of Posts and Telecommunications 2021年第1期28卷 87-93页

作者： Dun Shubo jin qiuyan Bi Lingyu Wang Ziren Xie Jun The 54th Research Institute of CETC Shijiazhuang 050050China School of Information Science and Teehnology Southwest Jiaotong UniversityChengdu 614202China School of Electronie Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China

Coaxial connectors are generally regarded as a kind of potential passive non-linear source when magnetic materials are applied in the coating or under-plating, which may result in serious passive intermodulation(PIM) interference and degrade the communication quality. In this paper, the effect of connector coating materials on the PIM is theoretically studied using finite element analysis(FEA) and circuit simulations. Considering the material composition both in central and outer conductor, an FEA model of connector is proposed to identify the current density in magnetic material region. An equivalent circuit model expressing the nonlinearity in coating material is developed, coupled with the non-linear transfer model. The PIM product power of the connector with related material configuration is predicted by harmonic balance simulation. Intentionally design connector samples are used in PIM tests and the measurement results are consistent with the theoretical predictions. The PIM performance in coaxial connectors is demonstrated from the perspectives of both modeling analysis and experimental investigations.

关键词： passive intermodulation(PIM) finite element analysis(FEA) circuit model coaxial connector

Lifetime prediction of electrical connectors under multiple environment stresses of temperature and particulate contamination

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The Journal of China Universities of Posts and Telecommunications 2016年第5期23卷 61-67,81页

作者： Li Qingya Gao jinchun Xie Gang jin qiuyan Ji Rui School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing Key laboratory of Work Safety Intelligent Monitoring Beijing University of Posts and Telecommunications School of Information and Communication Engineering Beijing University of Posts and Telecommunications

Electrical connectors play a significant role in the electronic and communication systems. As they are often exposed in the atmosphere environment, it is extremely easy for them to cause electrical contact failure. It is essential to carry out the reliability modeling and predict the lifetime. In the present work, the accelerated lifetime testing method which is on account of the uniform design method was designed to obtain the degradation data under multiple environmental stresses of temperature and particulate contamination for electrical connectors. Based on the degradation data, the pseudo life can be acquired. Then the reliability model was established by analyzing the pseudo life. Accordingly, the reliability function and reliable lifetime function were set up, and the reliable lifetime of the connectors under the multiple environment stresses of temperature and particulate contamination could be predicted for electrical connectors,

关键词： electrical connectors accelerated lifetime testing lifetime prediction

阿帕替尼联合多西他赛腹腔灌注及静脉化疗治疗胃癌腹膜转移患者的效果

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黑龙江医药 2022年第2期35卷 348-350页

作者：金秋言抚顺市中心医院肿瘤内科辽宁抚顺113006

目的:探讨阿帕替尼联合多西他赛腹腔灌注及静脉化疗治疗胃癌腹膜转移患者的效果。方法:本研究选取的观察对象为78例胃癌腹膜转移患者,为我院2017年9月—2019年12月收治的。所有观察对象遵循随机数字表的分组方法,均分为2个组别。对照组3... 详细信息

目的:探讨阿帕替尼联合多西他赛腹腔灌注及静脉化疗治疗胃癌腹膜转移患者的效果。方法:本研究选取的观察对象为78例胃癌腹膜转移患者,为我院2017年9月—2019年12月收治的。所有观察对象遵循随机数字表的分组方法,均分为2个组别。对照组39例患者采用腹腔灌注多西他赛联合静脉化疗措施;治疗组在对照组治疗方法的基础加用阿帕替尼治疗。对两组患者的临床疗效进行比较分析及化疗不良反应,检测比较治疗前血清肿瘤标志物水平变化。结果:在临床治疗总有效率方面,治疗组和对照组分别为94.87%、76.92%,两组之间存在统计学差异(P<0.05)。治疗组治疗期间血小板计数和中性粒细胞计数减少情况、消化道反应以及手足综合征等不良反应发生率低于对照组(P<0.05)。两组经过治疗后,血清肿瘤标记着水平均低于治疗前(P<0.05);与对照组治疗后比较,治疗组治疗后血清肿瘤标记物水平降低(P<0.05)。结论:阿帕替尼联合多西他赛腹腔灌注及静脉化疗治疗胃癌腹膜转移患者的效果确切,患者化疗不良反应较少,血清肿瘤标志物水平,得到有效降低,临床值得进行推广。

关键词：多西他赛腹腔灌注阿帕替尼胃癌腹膜转移治疗效果

青少年体育健康促进干预项目评价指标体系构建

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武汉体育学院学报 2018年第3期52卷 67-74页

作者：司琦金秋艳浙江大学教育学院体育学系浙江杭州310028

我国青少年体育健康促进干预研究兴起,而评价相对滞后,在一定程度上限制了干预项目的完善与推广。采用文献分析和德尔菲法,构建基于RE-AIM框架的青少年体育健康促进干预项目评价指标体系。检索并筛选出国内外相关文献27篇用于文献分析,... 详细信息

我国青少年体育健康促进干预研究兴起,而评价相对滞后,在一定程度上限制了干预项目的完善与推广。采用文献分析和德尔菲法,构建基于RE-AIM框架的青少年体育健康促进干预项目评价指标体系。检索并筛选出国内外相关文献27篇用于文献分析,据此初步构建评价体系;随后使用德尔菲法,选取8名专家,进行两轮意见征询,专家意见一致性良好。采用界值法筛除"经济效果"指标,并根据专家意见修改指标条目、调整指标结构。构建完成的青少年体育健康促进干预评价指标体系包含"可及性"等5项一级指标、"参与学生的数量与比例"等14项二级指标、"参与学生的数量"等38项三级指标。

关键词： RE-AIM框架身体活动体育健康促进干预评价指标体系