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Nano-Micro Letters 2022年第6期14卷 219-233页

作者： Changyuan Yan Yangyang Wang xianyu deng Yonghang Xu Shenzhen Key Laboratory of Advanced Materials School of Materials Science and EngineeringHarbin Institute of TechnologyShenzhen 518055People’s Republic of China School of Materials Science and Hydrogen Energy Foshan UniversityFoshan 528000China

Aqueous zinc ion batteries have high potential applicability for energy storage due to their reliable safety,environmental friendliness,and low cost.However,the freezing of aqueous electrolytes limits the normal operation of batteries at low temperatures.Herein,a series of high-performance and low-cost chloride hydrogel electrolytes with high concentrations and low freezing points are developed.The electrochemical windows of the chloride hydrogel electrolytes are enlarged by>1 V under cryogenic conditions due to the obvious evolution of hydrogen bonds,which highly facilitates the operation of electrolytes at ultralow temperatures,as evidenced by the low-temperature Raman spectroscopy and linear scanning voltammetry.Based on the Hofmeister effect,the hydrogen-bond network of the cooperative chloride hydrogel electrolyte comprising 3 M ZnCl_(2)and 6 M LiCl can be strongly interrupted,thus exhibiting a sufficient ionic conductivity of 1.14 mS cm;and a low activation energy of 0.21 e V at-50℃.This superior electrolyte endows a polyaniline/Zn battery with a remarkable discharge specific capacity of 96.5 mAh g;at-50℃,while the capacity retention remains~100%after 2000 cycles.These results will broaden the basic understanding of chloride hydrogel electrolytes and provide new insights into the development of ultralow-temperature aqueous batteries.

关键词： Chloride hydrogel Electrochemical window Cooperative effect Hydrogen-bond Ultralow temperature Aqueous zinc ion battery

Cryoactivated proton-involved redox reactions enable stable-cycling fiber cooper metal batteries operating at-50℃

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Journal of Energy Chemistry 2023年第5期80卷 758-767,I0016页

作者： Changyuan Yan Zixuan Chen Hongzhong deng Hao Huang xianyu deng Shenzhen Key Laboratory of Advanced Materials School of Materials Science and EngineeringHarbin Institute of TechnologyShenzhen 518055GuangdongChina

Fiber-shaped batteries that feature outstanding flexibility,light weight,and wovenability are extremely attractive for powering smart wearable electronic textiles,which further stimulates their demand in extreme environments.However,there are rare reports on ultralow-temperature fiber batteries to date.This is mainly attributed to the poor conductivity of electrodes and freezing of electrolytes that restrain their satisfactory flexible operation in cold environments.Herein,we propose a fiber cooper metal battery consisting of a conductive polyaniline cathode,an anti-freezing Cu(BF4)2+H3PO4electrolyte and an acidresistant copper wire anode,which can withstand various deformations at ultralow temperatures.Impressively,enhanced capacity and cyclic stability can be achieved by cryoactivated abundant reactive sites in the polyaniline,while benefiting from redox reactions with rapid kinetics involving protons rather than copper ions.Consequently,this well-designed polyaniline/Cu fiber battery delivers excellent flexibility without obvious capacity decay after being bent at-30℃,as well as a remarkable discharge capacity of 120.1 mA h g-1and a capacity retention of 96.8%after 2000 cycles at-50℃.The fiber batteries integrated into wearable textiles can power various electronic devices.These performances greatly outperform those of most reported works.Overall,this work provides a promising strategy toward applications of cryogenic wearable energy storage devices.

关键词： Cryoactivated sites Proton-involved redox reactions Fiber cooper metal battery Polyaniline Cyclic stability Low temperature

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基于麻雀搜索算法的梯级泵站优化调度

水力发电学报 2024年第5期43卷 43-53页

作者：马夏敏张雷克刘小莲田雨王雪妮邓显羽太原理工大学水利科学与工程学院太原030024 中国水利水电科学研究院流域水循环模拟与调控国家重点实验室北京100038 中水东北勘测设计研究有限公司长春130021

针对梯级泵站系统运行效率普遍偏低、能耗损失较大等问题,建立了梯级泵站优化调度模型,引入了寻优能力强、搜索精度高的麻雀搜索算法(SSA),对算法中安全阈值和侦察者占比两参数进行了比选;据此提出了基于SSA算法的梯级泵站优化调度方法... 详细信息

针对梯级泵站系统运行效率普遍偏低、能耗损失较大等问题,建立了梯级泵站优化调度模型,引入了寻优能力强、搜索精度高的麻雀搜索算法(SSA),对算法中安全阈值和侦察者占比两参数进行了比选;据此提出了基于SSA算法的梯级泵站优化调度方法,并将其应用于密云水库调蓄工程中的三级泵站优化调度研究。结果表明,三种不同流量工况下,相较于现状方案,PSO及GA算法所得优化方案其系统运行效率可提升0.03%~0.18%,年运行成本可节省¥9,700~¥69,500。利用SSA算法所获优化方案在两项指标改进方面更为突出,可达到0.98%~1.20%的效率提升及¥369,000~¥443,900的年运行费用的节省,验证了SSA算法在梯级泵站优化调度中的可行性和高效性,可为梯级泵站优化调度提供一种合理可靠的方法。

关键词：梯级泵站优化调度麻雀搜索算法高效运行大系统分解协调模型

轴流式水轮发电机组不对中-碰摩耦合故障振动特性分析

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振动与冲击 2024年第8期43卷 11-18,60页

作者：张雷克蔚建辉王雪妮张金剑马震岳邓显羽太原理工大学水利科学与工程学院太原030024 河南省黄河流域水资源节约集约利用重点实验室郑州450046 大连理工大学建设工程学部辽宁大连116023 中水东北勘测设计研究有限公司长春130021

针对轴流式水轮发电机组因联轴器偏角不对中引起的碰摩转子-转轮系统振动问题,基于修正的LuGre摩擦模型,该研究推导了联轴器不对中故障下转轮叶片碰摩力表达式。在此基础上,搭建了综合考虑不平衡磁拉力等外激励作用下系统动力学模型。... 详细信息

针对轴流式水轮发电机组因联轴器偏角不对中引起的碰摩转子-转轮系统振动问题,基于修正的LuGre摩擦模型,该研究推导了联轴器不对中故障下转轮叶片碰摩力表达式。在此基础上,搭建了综合考虑不平衡磁拉力等外激励作用下系统动力学模型。采用数值方法研究了不对中角度对系统振动特性的影响,并结合Floquet理论分析了以转速为控制变量的系统周期解稳定性。结果表明,不对中的存在增大了系统发生失稳可能性,显著改变了系统动态特性。此外,不对中角度对转子与转轮振动响应的影响具有较大差异,随着不对中角度的增加,转轮振动变化明显且碰摩程度较为恶劣。该研究结果可为轴流式水轮发电机组安全运行及稳定性分析提供有益借鉴。

关键词：轴流式水轮发电机组转子-转轮系统不对中碰摩

自发性脑出血重症患者30 d死亡风险预测模型的建立及验证

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中华脑血管病杂志（电子版） 2024年第2期18卷 121-128页

作者：邓仙裕罗钰璇张溱乐余展鹏彭亮广州医科大学金域检验学院 511436 广州医科大学第一临床学院广州510120 广州医科大学附属第五医院医学检验科广州510700

目的分析自发性脑出血重症患者30 d死亡的危险因素,并建立自发性脑出血重症患者30 d死亡风险预测模型。方法从重症监护数据库中提取自发性脑出血重症患者临床数据,使用Lasso回归分析筛选患者30 d死亡的潜在危险因素,在此基础上,使用Logi... 详细信息

目的分析自发性脑出血重症患者30 d死亡的危险因素,并建立自发性脑出血重症患者30 d死亡风险预测模型。方法从重症监护数据库中提取自发性脑出血重症患者临床数据,使用Lasso回归分析筛选患者30 d死亡的潜在危险因素,在此基础上,使用Logistic回归分析构建自发性脑出血重症患者30 d死亡风险预测模型并绘制列线图,通过计算C指数、绘制该模型的校准曲线及临床决策曲线等,评价模型的预测能力与临床适用性。结果死亡组与生存组患者在基础疾病、生命体征、检验指标等方面存在显著差异。所建立模型的C指数为0.906,重抽样后C指数为0.867,模型校准曲线与实际曲线有较好的一致性。此外,决策曲线分析结果显示,使用此列线图模型能使患者获得临床净收益。结论基于Logistic回归分析构建的自发性脑出血重症患者30 d死亡风险预测模型具有良好的临床适用性。

关键词：自发性脑出血重症监护数据库预测模型列线图

College English Teaching Based on the Theory of Core Competencies

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Cultural and Religious Studies 2024年第5期12卷 309-313页

作者： xianyu Jing Beijing Union University BeijingChina

The core competencies of college students can influence their further learning,employment,and personal development.This paper explores college English teaching from the three aspects of core competencies:cultural foundation,self-development,and social participation.Adapting to the challenges posed by the new era for the cultivation of foreign language talents,the paper aims to improve students’cultural literacy,independent learning,the ability of problem discovery and problem solving,and critical cultural thinking,so as to make them more competitive in employment and entrepreneurship.

关键词： core competency cultural literacy self-development social participation

Demonstration of a small‐scale power generator using supercritical CO_(2)

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Carbon Energy 2024年第4期6卷 269-290页

作者： Ligeng Li Hua Tian Xin Lin xianyu Zeng Yurong Wang Weilin Zhuge Lingfeng Shi Xuan Wang Xingyu Liang Gequn Shu State Key Laboratory of Engines Tianjin UniversityTianjinChina Department of Thermal Science and Energy Engineering University of Science and Technology of ChinaHefeiChina State Key Laboratory of Automotive Safety and Energy Tsinghua UniversityBeijingChina

The supercritical CO_(2)(sCO_(2))power cycle could improve efficiencies for a wide range of thermal power plants.The sCO_(2)turbine generator plays an important role in the sCO_(2)power cycle by directly converting thermal energy into mechanical work and electric power.The operation of the generator encounters challenges,including high temperature,high pressure,high rotational speed,and other engineering problems,such as leakage.Experimental studies of sCO_(2)turbines are insufficient because of the significant difficulties in turbine manufacturing and system construction.Unlike most experimental investigations that primarily focus on 100 kW‐or MW‐scale power generation systems,we consider,for the first time,a small‐scale power generator using sCO_(2).A partial admission axial turbine was designed and manufactured with a rated rotational speed of 40,000 rpm,and a CO_(2)transcritical power cycle test loop was constructed to validate the performance of our manufactured generator.A resistant gas was proposed in the constructed turbine expander to solve the leakage issue.Both dynamic and steady performances were investigated.The results indicated that a peak electric power of 11.55 kW was achieved at 29,369 rpm.The maximum total efficiency of the turbo‐generator was 58.98%,which was affected by both the turbine rotational speed and pressure ratio,according to the proposed performance map.

关键词： generator performance map power generation supercritical CO_(2) turbine

Light-triggered fluorochromic cholesteric liquid crystal elastomer with hydrogen-bonded fluorescent switch: dualmodal-switchable circularly polarized luminescence

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Science China Chemistry 2024年第8期 2719-2727页

作者： Siyang Lin Tianqi Ren xianyu Meng Wenxin Kang Jinbao Guo Key Laboratory of Carbon Fibers and Functional Polymers Ministry of Education College of Materials Science and Engineering Beijing University of Chemical Technology

Solid materials with dynamically tunable circularly polarized luminescence（CPL） feature higher security levels and devicefriendly characteristics, showing great superiority in the field of information technology and anti-counterfeiting. To address the limited photoisomerization of fluorescent photoswitch in CPL-active solid materials, here a cholesteric liquid crystal elastomer（CLCE） containing a hydrogen-bonded（H-bonded） polymerizable fluorescent switch AHBA-PSD is prepared. Owing to the good flexibility and low glass-transition temperature of CLCE, AHBA-PSD shows a fast and fully reversible photocyclization/cycloreversion with fluorochromic behavior in CLCE. Further, by controlling the spectral overlapping area between the emission and reflection bands, the CLCE exhibits a strong CPL with a glumvalue of up to 0.76 accompanied by a reversible phototunable CPL signal. Meanwhile, the H-bond helps to stabilize the mechanical property, and the force-induced switching-off of CPL signal could be achieved due to the destroyed helical structures by external force. Finally, an automatically-recognized identification card with abundant chiroptical information is demonstrated.

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志贺氏菌噬菌体ΦDS8对患病肉鸡的治疗及其肠道菌群的影响

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浙江农业学报 2022年第7期34卷 1386-1395页

作者：陈诗雨徐美余邓征宇王峰张麒麟邓先余林连兵昆明理工大学生命科学与技术学院云南昆明650500 云南省高校饲用抗生素替代技术工程研究中心云南昆明650500

志贺氏菌是一种常见的肠道致病菌,其引起的细菌病是危害公共卫生的人畜共患病之一。随着抗生素的滥用,志贺氏菌耐药性的问题难以控制,急需新的方法来解决,采用噬菌体杀灭耐药性细菌已日益受到重视。本研究建立肉鸡感染志贺氏菌模型,分... 详细信息

志贺氏菌是一种常见的肠道致病菌,其引起的细菌病是危害公共卫生的人畜共患病之一。随着抗生素的滥用,志贺氏菌耐药性的问题难以控制,急需新的方法来解决,采用噬菌体杀灭耐药性细菌已日益受到重视。本研究建立肉鸡感染志贺氏菌模型,分别采用感染前2 h灌喂噬菌体液预防和感染2 h后灌喂噬菌体液两种方法对肉鸡进行治疗。灌喂志贺氏菌2 h后的肉鸡均出现腹泻状况,粪便中志贺氏菌含量最高达到1×10^(7) CFU·g^(-1),优势菌群含量大幅下降,有害菌群占比上升。噬菌体治疗后,肉鸡粪便中噬菌体含量上升,志贺氏菌含量下降,粪便性状及肠道菌群恢复正常,且肉鸡存活率100%。没有噬菌体治疗的肉鸡存活率60%,解剖观察发现器官病变明显。噬菌体ΦDS8在治疗志贺氏菌株感染方面有良好的效果,其作为抗生素替代产品有较好的应用价值和前景。

关键词：志贺氏菌噬菌体肉鸡肠道菌群

Dabie Mountains Spirit——Cultural Assets of CPC

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China News Release 2024年第4期 58-61页

作者： Sun Wei Zhang xianyu 不详

In September 2019,during President Xi Jinping’s inspection of Henan Province in central China,he remarked that"the Jiao Yulu spirit,the Red Flag Canal spirit,and the Dabie Mountains spirit are all valuable cultural wealth of the Communist Party of China(CPC)."This underscores the crucial position of the Dabie Mountains spirit in the revolutionary legacy of the CPC.

关键词： CPC spirit Mountains