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Self-powered wireless environmental monitoring system for in-service bridges by galloping piezoelectric-triboelectric hybridized energy harvester

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Science China(Technological Sciences) 2024年第5期67卷 1498-1509页

作者： HUANG KangXu WANG xiaofei WANG Li ZHOU YuHui liu FuHai CHANG ShiYuan ZHU JunTao ZHOU YuXuan ZHANG He LUO JiKui College of Civil Engineering and Architecture Zhejiang UniversityHangzhou310058China Anhui Transport Consulting&Design Institute Co. Ltd.Hefei230088China College of Electronics&Information Hangzhou Dianzi UniversityHangzhou310018China Center for Balance Architecture Zhejiang UniversityHangzhou310058China College of Information Science&Electronic Engineering Zhejiang UniversityHangzhou310027China

The energy harvesting technology for the ubiquitous natural wind enables a desirable solution to the issue of distributed sensors in the bridge environmental sensing Internet of Things(Io T)system being restricted to conventional energy *** this work,a self-powered system based on a compact galloping piezoelectric-triboelectric energy harvester(GPTEH)is developed to achieve efficient wind energy *** GPTEH is constructed on the prototype of a cantilever structure with piezoelectric macro-fiber composite(MFC)sheets and a rectangular bluff body with triboelectric nanogenerators(TENGs).Through a special swing-type structural design with iron blocks inside the bluff body,the GPTEH exhibits preferable aerodynamic behavior and excellent energy conversion efficiency,compared to conventional cantilever kind of piezoelectric wind energy harvester(PWEH).The GPTEH also demonstrates the capability of high output power density(PEH of 23.65 W m^(-2)and TENG of 1.59 W m^(-2)),superior response wind speed(about 0.5 m s^(-1)),and excellent long-term stability(over 14000 cyclic tests).Furthermore,a power management system is developed to efficiently utilize the output energy from GPTEH to power the sensors and wirelessly transmit environmental data to the *** proposed GPTEH-powered system exhibits a great potential for the bridge environmental monitoring and Io T technologies.

关键词： self-powered hybrid nanogenerator triboelectric nanogenerator macro-fiber composite wireless environmental monitoring system

罐式断路器加装内置式特高频局部放电传感器方法研究

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河北工业科技 2024年第3期41卷 227-233页

作者：李建鹏孟延辉付炜平张伟李强刘晓飞李连众郝自为国网河北省电力有限公司超高压分公司河北石家庄050071 国网河北省电力有限公司衡水供电分公司河北衡水053000 西安西电开关电气有限公司陕西西安710077

为了提高罐式断路器绝缘状态监测水平,保障设备可靠运行,提出了现场加装内置式特高频局部放电传感器实施方法。首先,通过加装位置选择、传感器选型、密封结构设计、电场仿真计算和安装环境控制,实现内置式特高频局部放电传感器的现场安... 详细信息

为了提高罐式断路器绝缘状态监测水平,保障设备可靠运行,提出了现场加装内置式特高频局部放电传感器实施方法。首先,通过加装位置选择、传感器选型、密封结构设计、电场仿真计算和安装环境控制,实现内置式特高频局部放电传感器的现场安装;其次,通过密封试验检查加装位置的密封性能;最后,利用真型测试检验传感器的安装效果。结果表明:加装特高频传感器以后,罐式断路器内手孔表面和耦合电极的最大场强为12.45 kV/mm,屏蔽罩的最大场强为18.51 kV/mm,均小于设计许用值;密封结构包扎5 h后定量检漏SF6气体体积分数为8μL/L,小于标准要求值15μL/L;传感器灵敏度满足检测需要,且对外界干扰信号具有一定的抑制作用。运罐式断路器在加装内置式特高频局部放电传感器以后,其绝缘性能、密封性能和检测灵敏度均满足设计要求。研究结果为解决特高频局部放电现场检测提供了一种较为实用高效的方法。

关键词：波谱分析内置式罐式断路器局部放电特高频密封结构

Ammonium Salt Deposition Characteristics in an Air Cooler System Based on the Coupling of Fluid Flow and Heat Transfer Simulation

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China Petroleum Processing & Petrochemical Technology 2019年第4期21卷 94-102页

作者： Jin Haozhe Zhou Junfeng liu Wenwen liu xiaofei Ou Guofu The Institute of Flow-Induced Corrosion Zhejiang Sci-Tech UniversityHangzhou 310018 The Insititute of Flow-Induced Corrosion and Intelligent Precaution and Control Changzhou UniversityChangzhou 213016

The ammonium salt corrosion is a typical failure mode for the hydrogenation reaction effluent air cooler(REAC) system. In order to investigate the corrosion characteristics in the REAC system, numerical simulations were performed by using the mixture model, the heating transfer model, and the particles tracking model. The results show that the differences between the temperature and the velocity at each cross section of the first-row and second-row tubes are small. The inertia of the particles plays an important role in the particle’s deposition, and the smaller particles distribute more uniformly in the air cooler. However, for larger particles, they prefer falling from the inner side of the vertical elbow, and preferentially depositing at the inlet header and pipes before saturation. In the heat exchanger tubes, the particle deposition number is larger in the second-row tubes than that in the first-row tubes, and the high-risk tubes mainly concentrate on the middle and right side of the air cooler. The kinetic parameters of the particles are in accordance with the blocking-prone position in many real operating conditions.

关键词： hydrogenation air cooler multiphase flow ammonium salt corrosion particles drifting

Topology modulation of tetraphenylethylene graphdiyne at a liquid-liquid interface

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Nano Research 2024年第6期17卷 4661-4667页

作者： Tingting Xu Pei Wen Ng Shaofei Wu Danjun Fu Yunhan Ma Yao liu Lidao Li xiaofei Zhang Jun Zhu Department of Chemistry National University of SingaporeSingapore 117543Singapore Institute of Materials Research and Engineering(IMRE) Agency for ScienceTechnology and Research(A*STAR)Singapore 138634Singapore

Monomers with low symmetries can form different topological structures in the preparation of organic two-dimensional(2D)***,it remains challenging to modulate the topologies in practical *** theoretical insights into the formation energy of potential structural configurations,we report the topology modulation of a graphdiyne(GDY)derivative constructed from two-fold symmetric tetrakis(4-ethynylphenyl)ethene precursor by changing solvent combinations in a liquid-liquid interfacial *** aqueous-organic(water-dichloromethane)interface afforded GDY with a kagome topology while a rhombic topology was formed at an organic-organic(hexane-acetonitrile)interface.A comprehensive evaluation of their structures and optoelectronic properties was conducted through various characterization techniques and theoretical *** study provided new insights to modulate the topology of not only GDY but also other framework structures and obtain topologically pure materials in situations where different topologies are possible during practical synthesis.

关键词： graphdiyne derivative tetraphenylethylene topology modulation aggregation-induced emission(AIE)two-dimensional(2D)polymers interfacial synthesis

Hierarchical nanostructured composite cathode with carbon nanotubes as conductive scaffold for lithium-sulfur batteries

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Journal of Energy Chemistry 2013年第2期22卷 341-346页

作者： xiaofei liu Qiang Zhang Jiaqi Huang Shumao Zhang Hongjie Peng Fei Wei Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical Engineering Tsinghua University

Carbon nanotubes （CNTs） are excellent scaffolds for advanced electrode materials, resulting from their intrinsic sp2 carbon hybridization, interconnected electron pathway, large aspect ratio, hierarchical porous structures, and low cost at a large-scale production. How to make full utilization of the mass produced CNTs as building blocks for nanocomposite electrodes is not well understood yet. Herein, a composite cathode containing commercial agglomerated multi-walled CNTs and S for Li-S battery was fabricated by a facile melt-diffusion strategy. The hierarchical CNT@S coaxial nanocables exhibited a discharging capacity of 1020 and 740 mAh .g-1 at 0.5 and 2.0 C, respectively. A rapid capacity decay of 0.7% per cycle at the initial 10 cycles and a slow decay rate of 0.14% per cycle for the later 140 cycles were detected. Such hierarchical agglomerated CNT@ S cathodes show advantages in easy fabrication, environmentally benign, low cost, excellent scalability, and good Li ion storage performance, which are extraordinary composites for high performance Li-S battery.

关键词： carbon nanotubes lithium sulfur battery hierarchical nanocomposite cathode energy storage

Extension and application of a database for the rapid identification of Vibrio using MALDI-TOF MS

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Acta Oceanologica Sinica 2020年第10期39卷 140-146页

作者： Jing Wu Yuexia Zhou xiaofei liu Yuan Cao Chengjin Hu Yingjian Chen Departments of Laboratory Medicine The 960th Hospital of the PLA Joint Logistics Support ForceJinan 250031China Teaching and Research Office of Medical Laboratory Science Heze Medical CollegeHeze 274000China

Rapid and accurate identification of Vibrio species has been problematic because phenotypic characteristics are variable within species and biochemical identification requires two or more days to ***-assisted laser desorption ionization–time of flight mass spectrometry(MALDI-TOF MS)has become a powerful tool for rapidly distinguishing between related bacterial ***,its accuracy depends on the number of strains in a *** the current study,we extend and apply the Vibrio database based on MALDI-TOF MS.A total of 74 strains of Vibrio representing 28 species were identified and included in new database.A phylogenetic tree based on rpoB sequence and dendrograms were *** analyzed 30 clinical Vibrio of three species to evaluate the new database and carried out PCA dendrogram analyses for differences of *** created a new database that offered fast and accurate Vibrio *** and PCA dendrogram analyses provided technical support to track sources and incidences of Vibrio *** addition,the discovery of characteristic and differential peaks is useful for the future identification of *** represents a powerful tool for the rapid and accurate classification and identification of Vibrio and closely related species.

关键词： database Vibrio MALDI-TOF MS rpoB dendrograms

猪Linda病毒巢式RT-PCR检测方法的建立

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中国动物检疫 2024年第1期41卷 95-101页

作者：于浩洋王彩霞仇松寅刘晓飞景宏丽吴绍强冯春燕林祥梅中国检验检疫科学研究院动物检验与检疫研究所北京100176 三亚中国检科院生物安全中心海南三亚572000

猪Linda病毒能引起仔猪先天性震颤,严重危害养猪业的发展,目前在我国暂未发现感染病例。本研究根据猪Linda病毒Core-E~(ms)基因序列,设计并合成巢式RT-PCR引物,通过对退火温度、引物浓度等进行优化,建立了猪Linda病毒巢式RT-PCR检测方... 详细信息

猪Linda病毒能引起仔猪先天性震颤,严重危害养猪业的发展,目前在我国暂未发现感染病例。本研究根据猪Linda病毒Core-E~(ms)基因序列,设计并合成巢式RT-PCR引物,通过对退火温度、引物浓度等进行优化,建立了猪Linda病毒巢式RT-PCR检测方法。结果显示,该方法具有良好的特异性,与非洲猪瘟病毒、猪瘟病毒、猪繁殖与呼吸综合征病毒、猪伪狂犬病病毒、猪圆环病毒2型均无交叉反应;敏感性好,对慢病毒阳性对照品的最低检出限为10~1 copies/μL,比普通RT-PCR灵敏10倍。使用该方法检测模拟病毒样品,发现最低检出限为10~1 TU/mL,与荧光定量RT-PCR方法一致。本研究首次建立了可检测猪Linda病毒的巢式RT-PCR方法,其特异性强、灵敏度高,为在口岸以及条件有限的场地对猪Linda病毒进行精准且快速的检测提供了有效技术手段,也为防范Linda病毒传入提供了有力技术支撑。

关键词：猪Linda病毒巢式RT-PCR 检测方法非典型瘟病毒

肺移植术后支气管吻合口裂开行二次肺移植1例

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中华实用诊断与治疗杂志 2024年第7期38卷 699-703页

作者：杨建辉赵高峰丁志丹王跃斌李丰科刘晓飞赵凯郑州大学第一附属医院肺移植外科/胸外科河南郑州450052

目的探讨1例肺移植后支气管吻合口裂开患者行二次肺移植的疗效及安全性。方法 1例支气管肺泡细胞癌患者,男,66岁,2023年5月21日于郑州大学第一附属医院行序贯式同种异体原位双肺移植术,术后2周康复出院。2023年6月14日住院复查,期间患... 详细信息

目的探讨1例肺移植后支气管吻合口裂开患者行二次肺移植的疗效及安全性。方法 1例支气管肺泡细胞癌患者,男,66岁,2023年5月21日于郑州大学第一附属医院行序贯式同种异体原位双肺移植术,术后2周康复出院。2023年6月14日住院复查,期间患者突发胸痛、胸闷、呼吸困难、血压下降、意识障碍,给予气管插管等措施抢救,转入ICU治疗4 h后突发右侧张力性气胸,紧急胸腔闭式引流出大量气体。行CT及气管镜检查,确诊为右侧支气管吻合口裂开。多学科会诊评估内科治疗及介入治疗效果差,经家属同意后拟行右肺移植,再次加入肺移植等待系统。2023年6月21日于全身麻醉、静脉-动脉体外膜肺氧合辅助下行同种异体原位右肺移植。记录二次肺移植手术情况及术后恢复情况。结果手术时间230 min,支气管吻合及包埋时间45 min,动脉吻合时间18 min,左房袖吻合时间12 min,术中出血量400 mL,冷缺血时间315 min。术后第1天体外膜肺氧合撤机,术后第2天呼吸机撤机,继续给予高流量吸氧,术后第11天转入普通病房治疗,术后第38天顺利康复出院,无术后并发症发生。术后第2、3个月复查胸部CT,提示患者肺膨胀良好。随访至2024年5月,患者继续康复中。结论二次肺移植治疗肺移植后支气管吻合裂开安全、有效,可使患者获益。

关键词：肺移植支气管吻合口裂开二次肺移植

Spatial pattern and decadal change of agro-meteorological disasters in the main wheat production area of China during 1991-2009

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Journal of Geographical Sciences 2014年第3期24卷 387-396页

作者： ZHANG Zhao WANG Pin CHEN Yi ZHANG Shuai TAO Fulu liu xiaofei Academy of Disaster Reduction and Emergency Management/State Key Laboratory of Earth Surface Process and Resource Ecology Beijing Normal University Beijing 100875 China Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China

Agro-meteorological disasters （AMD） have become more frequent with climate warming. In this study, the temporal and spatial changes in the occurrence frequency of major meteorological disasters on wheat production were firstly explored by analyzing the observed records at national agro-meteorological stations （AMS） of China from 1991 to 2009. Fur- thermore, impact of climate change on AMD was discussed by comparing the warmer decade （2000-2009） with another decade （1991-2000）. It was found that drought was the most fre- quent disaster during the last two decades, with a highest proportion of 79%. And the fre- quency of AMD increased significantly with climate change. Specifically, the main disasters occurred more frequently in the reproductive period than in the vegetative period. Besides, the spatial changes in the AMD frequency were characterized by region-specific. For example the wheat cultivation areas located on the Loess Plateau and the middle-lower reaches of the Yellow River suffered mainly from drought. All these results were strongly linked to climate change in China. Therefore, sound adaptation options should be taken based on the latest changes of AMD under global warming to reduce agricultural damages.

关键词： wheat agro-meteorological disasters climate change drought heat stress