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Mechanism and application of mechanical property improvements in engineering materials by pulsed magnetic treatment:A review

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Friction 2024年第10期12卷 2139-2166页

作者： Zhipeng CAI chengkai qian Xu ZHANG Ning DAI Yao WU Wen JI State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing 100084China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Tianjin Research Institute for Advanced Equipment Tsinghua UniversityTianjin 300304China

Pulsed magnetic treatment(PMT)has been adopted as an effective strengthening method for engineering materials and components in recent years,and the development of its application depends on the comprehensive understanding of the nature of *** deep mechanism was thought initially to be the magnetostrictive effect,while further investigation found that the magnetic field could lead to the change of the defect states in the crystal,which is called the magnetoplastic *** to the complexity of the engineering materials,manifestations of the magnetoplastic effect become more diverse,and they were reviewed in the form of microstructure homogenization and interfacial ***,the mechanism of the magnetoplastic effect was discussed,focusing on the changes in the spin states under the external magnetic *** modifications could also alter material performances,especially the residual stress,plasticity,and fatigue ***,PMT with specific parameters can be utilized to obtain an ideal combination of microstructure,residual stress,and mechanical properties for better service performance of different mechanical parts,and its applications on machining tools and bearings are perfect *** work reviews the effect of PMT on the microstructure and properties of different materials and the mechanism,and it also summarizes the fundamental applications of PMT on essential mechanical parts.

关键词： pulsed magnetic treatment wear resistance microstructure modifications mechanical properties magnetoplastic effect

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ZnCo2O4/ZnO induced lithium deposition in multi-scaled carbon/nickel frameworks for dendrite-free lithium metal anode

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Journal of Energy Chemistry 2020年第4期29卷 16-23页

作者： Kai Wu Binglu Zhao chengkai Yang qian Wang Wen Liu Henghui Zhou College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871China College of Science Beijing University of Chemical TechnologyBeijing 100029China Beijing National Laboratory for Molecular Sciences Beijing 100871China Beijing Engineering Research Center of Power Lithium-ion Battery Beijing 102202China

Lithium metal attracts growing attention as an ideal anode candidate for next generation lithium battery systems owing to its high capacity,low density,and low working ***,the volume expansion of the bulk and dendrite growth on the surface of lithium anode limits its practical ***,we fabricate a composite lithium host featuring both multiple scaled structure and lithiophilic property to address obstacles at both aspects of bulk and surface *** which,the multiple scaled structure provides void space to accommodate lithium volume change while zinc and cobalt oxides sites derived from Zeolitic Imidazolate Frameworks can react with lithium and form a stable solid electrolyte interphase,leading to a stable cycling of lithium symmetrical cell for more than 500 cycles with voltage hysteresis of only 88 mV at 2 mAcm^-2 and 5 mAh cm^-***,full cells paired with LiFePO4 cathode can realize 500 cycles with 99.2%capacity retention,showing great potential for practical *** excellent electrochemical performance of the composite lithium anode proves the effectiveness of our anode design with multiple scaled structure and lithiophilic feature,which can be also expanded to other metal anodes for batteries.

关键词： Lithium metal battery Lithium metal anode Zeolitic Imidazolate Frameworks Lithiophilic surface SEI

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Circulating Current Suppression for MMC-HVDC Systems with Asymmetric Arm Impedance

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CSEE Journal of Power and Energy Systems 2021年第3期7卷 530-540页

作者： Fujin Deng qian Heng chengkai Liu Yongqing Lyu Qingsong Wang Dan Liu Rongwu Zhu School of Electrical Engi-neering Southeast Universityand Jiangsu Key Laboratory of Smart Grid Technology and EquipmentNanjing 210096China School of Electrical Engineering Southeast UniversityNanjing 210096China State Grid Jiangsu Electric Power CO. LTD.Research InstituteNanjing 211106China Department of Power Electronics Christian-Albrechts-University of KielKiel2D-24142Germany

The modular multilevel converter(MMC)has been a highly promising topology in the high-voltage direct-current(HVDC)transmission area,where each arm of the MMC may consist of hundreds of series-connected submodules and an *** to its parameter inaccuracy,component aging,and so on,the component parameter in different arms of the MMC may be different,which may cause circulating current in the MMC-HVDC transmission system,and result in current deterioration,power losses,and electromagnetic interference,*** this paper,the circulating current suppressing(CCS)in the MMC-HVDC system,due to asymmetric arm impedance,is *** on the mathematical analysis,a method of using an auxiliary circuit is proposed for the MMC to realize the CCS and improve the performance of the MMC-HVDC *** studies are conducted with PSCAD/EMTDC in the HVDC system,which confirms the feasibility of the proposed method.

关键词： Circulating current suppressing control strategy high-voltage direct-current modular multilevel converter

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Overview on Submodule Topologies,Modeling,Modulation,Control Schemes,Fault Diagnosis,and Tolerant Control Strategies of Modular Multilevel Converters

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Chinese Journal of Electrical Engineering 2020年第1期6卷 1-21页

作者： Fujin Deng Yongqing Lu chengkai Liu qian Heng qiang Yu Jifeng Zhao School of Electrical Engineering Southeast UniversityNanjing 210096China

In the present scenario,modular multilevel converters(MMCs)are considered to be one of the most promising and effective topologies in the family of high-power converters because of their modular design and good scalability;MMCs are extensively used in high-voltage and high-power *** on their unique advantages,MMCs have attracted increasing attention from academic circles over the past *** studies have focused on different aspects of MMCs,including submodule topologies,modeling schemes,modulation strategies,control schemes for voltage balancing and circulating currents,fault diagnoses,and fault-tolerant control *** summarize the current research status of MMCs,all the aforementioned research issues with representative research approaches,results and characteristics are systematically *** the final section,the current research status of MMCs and their future trends are emphasized.

关键词： Capacitor voltage balancing control circulating current control fault diagnosis fault tolerant control modular multilevel converters modulating strategy modeling scheme submodule topology

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Interwoven nickel(II)-dimethylglyoxime nanowires in 3D nickel foam for dendrite-free lithium deposition

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Chinese Chemical Letters 2022年第4期33卷 2165-2170页

作者： Tianyi Zhou Yanlu Mu Jianyang Wu Bing Zhong chengkai Yang qian Wang Wen Liu Henghui Zhou Peng Jiang CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Chemical Resource Engineering College of ChemistryBeijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China College of Materials Science and Engineering Fuzhou UniversityFuzhou 350108China Institute of Energy Innovation College of Materials Science and EngineeringTaiyuan University of TechnologyTaiyuan 030024China

Metal skeletons,such as Nickel Foam(NF) has attracted worldwide interests as stable host for lithium metal anode because of its high stability,large specific surface area and high ***,most metal skeletons have lithophobic surface and uneven current distribution that result in sporadic lithium nucleation and uncontrolled dendrites ***,we describe a sequential immersing strategy to generate interwoven Nickel(Ⅱ)-dimethylglyoxime(Ni-DMG) nanowires at NF to obtain composite skeleton(NDNF),which can be used as an stable host for Li metal *** Ni-DMG has proved effective to realize uniform lithium nucleation and dendrite-free lithium *** with the three dimensional(3 D) hierarchical porous structure,the composite host shows a significantly improved coulombic efficiency(CE) than pristine commercial nickel ***,the corresponding Li‖Li symmetrical cells can run more than 700 h with low voltage hysteresis 22 mV at 1.0 mA/cm^(2),and Li@NDNF‖LiFePO;full-cell exhibits a high capacity retention of 82.03% at 1.0 C during 630 *** results proved the effectiveness of metal-organic complexes in governing Li metal growth and can be employed as a new strategy for dendrite-free Li metal anode and safe Li metal batteries(LMBs).

关键词： Nickel(II)-dimethylglyoxime Nickel foam Metal-organic complex Uniform nucleation Dendrite-free

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Leap of Li Metal Anodes from Coin Cells to Pouch Cells:Challenges and Progress

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Electrochemical Energy Reviews 2023年第1期6卷 39-86页

作者： qian Wang Tiantian Lu Yuanbin Xiao Jianyang Wu Lixiang Guan Lifeng Hou Huayun Du Huan Wei Xiaoda Liu chengkai Yang Yinghui Wei Henghui Zhou Yan Yu College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina Corrosion and Protection Engineering Technology Research Center of Shanxi Province Taiyuan 030024ShanxiChina Key Laboratory of Advanced Materials Technology College of Materials Science and EngineeringFuzhou UniversityFuzhou 350108FujianChina College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871China

Li metal anodes have attracted tremendous attention in the last decade because of their high theoretical capacities and low electrochemical ***,until now,there has only been limited success in improving the interfacial and structural stabilities and in realizing the highly controllable and large-scale fabrication of this emerging material;these limitations have posed great obstacles to further performing fundamental and applied studies in Li metal *** this review,we focus on summarizing the existing challenges of Li metal anodes based on the leap from coin cells to pouch cells and on outlining typical methods for designing Li metal anodes on demand;we controllably engineer their surface protection layers and structure sizes by encapsulating structured Li metal inside a variety of synthetic protection *** aim to provide a comprehensive understanding and serve as a strategic guide for designing and fabricating practicable Li metal anodes for use in pouch *** and opportunities regarding this burgeoning field are critically evaluated at the end of this review.

关键词： Li metal anode Dendrites Pouch cells Air stability Energy density

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上海地区真菌培养鉴定及体外药物敏感性试验室间质量评价结果分析

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检验医学 2021年第4期36卷 441-443页

作者：陈蓉张敏敏夏启航钱诚凯崔琳刘学杰徐蓉王庆忠葛平黄维纲王敬华上海市临床检验中心上海200126

目的通过室间质量评价(EQA)了解上海地区临床实验室真菌培养鉴定及体外药物敏感性试验的开展情况及检测质量。方法2019年EQA共发放10份样本(冻干菌株)进行真菌培养鉴定,其中4份要求同步进行体外药物敏感性试验。通过反馈结果对真菌鉴定... 详细信息

目的通过室间质量评价(EQA)了解上海地区临床实验室真菌培养鉴定及体外药物敏感性试验的开展情况及检测质量。方法2019年EQA共发放10份样本(冻干菌株)进行真菌培养鉴定,其中4份要求同步进行体外药物敏感性试验。通过反馈结果对真菌鉴定符合率和体外药物敏感性试验的开展情况进行统计分析。结果共收到75份有效回报结果,其中有45份进行了真菌体外药物敏感性试验。10株菌株(涵盖2个属9个种)中有4株鉴定结果符合率为100%,鉴定结果有误的菌株分别为葡萄牙念珠菌、季也蒙念珠菌、近平滑念珠菌、白念珠菌、罗伦隐球菌和新生隐球菌。2019年第1次EQA有93.3%(70/75)的实验室结果完全正确,6.7%(5/75)的实验室出现错误结果但总成绩合格;第2次EQA有94.7%(71/75)的实验室结果完全正确,4.0%(3/75)的实验室出现错误结果但总成绩合格,1.3%(1/75)的实验室成绩不合格。结论上海地区临床实验室真菌培养鉴定总体检测能力和准确率较高,开展真菌体外药物敏感性试验项目的临床实验室数量有限。质量控制对于保证检测结果的准确性具有十分重要的作用。

关键词：真菌培养鉴定体外药物敏感性试验室间质量评价质量控制

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听神经瘤大小与患者年龄的相关性分析

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中华神经外科杂志 2022年第8期38卷 816-820页

作者：钱珂王洋洋张诚楷贾旺首都医科大学附属北京天坛医院神经外科北京100070

目的:初步探讨听神经瘤大小与患者年龄的相关性。方法:回顾性分析2016年10月至2018年11月首都医科大学附属北京天坛医院神经外科采用经乙状窦后入路手术治疗的单侧听神经瘤患者的临床及影像学资料,共362例。根据术前MRI将患者分为中小... 详细信息

目的:初步探讨听神经瘤大小与患者年龄的相关性。方法:回顾性分析2016年10月至2018年11月首都医科大学附属北京天坛医院神经外科采用经乙状窦后入路手术治疗的单侧听神经瘤患者的临床及影像学资料,共362例。根据术前MRI将患者分为中小型听神经瘤(最大径59岁患者的占比分别为38.2%(55/144)、47.2%(68/144)、14.6%(21/144),中小型听神经瘤组的占比分别为21.1%(46/218)、64.7%(141/218)、14.2%(31/218),两组的年龄构成比差异有统计学意义(P=0.009)。多因素logistic回归分析显示,除囊实性、囊性肿瘤外,年龄59岁为参照,OR=2.09,95%CI:1.01~4.30),差异均有统计学意义(均P<0.05)。结论:初步观察显示,听神经瘤大小与年龄有相关性,其中年龄<40岁的患者发生大型听神经瘤的风险高。

关键词：神经瘤听年龄因素肿瘤大小

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孤独症谱系障碍儿童的观点采择能力特点及其相关因素

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中国心理卫生杂志 2023年第7期37卷 577-582页

作者：陈嘉洁王馨陈倩刘斯宇詹晓玲金诚开陈强静进中山大学公共卫生学院妇幼卫生系广州510080 珠海市妇幼保健院儿童心理卫生科广东珠海519000

目的:探讨孤独症谱系障碍(ASD)儿童观点采择特点及其关联因素。方法:纳入符合美国精神病诊断与统计手册第5版ASD诊断标准的儿童100例和年龄、性别匹配的正常对照组儿童100例。采用社会观点采择测验(SPT)评估入组儿童的认知和情感观点采... 详细信息

目的:探讨孤独症谱系障碍(ASD)儿童观点采择特点及其关联因素。方法:纳入符合美国精神病诊断与统计手册第5版ASD诊断标准的儿童100例和年龄、性别匹配的正常对照组儿童100例。采用社会观点采择测验(SPT)评估入组儿童的认知和情感观点采择能力,韦氏儿童智力量表第四版(WISCⅣ)、社交反应量表(SRS)及执行功能行为评定量表分别测评儿童的智力、社交反应能力及执行功能。Pearson偏相关分析观点采择能力与社交及认知功能的相关性。结果:孤独症组SPT中认知及情感观点采择得分均低于对照组儿童(均P<0.001)。不同性别、年龄的孤独症组儿童观点采择得分均低于正常对照组(均P<0.050)。孤独症组认知观点采择得分与总智商正相关(r=0.26,P=0.011),与社交反应量表得分负相关(r=-0.20,P<0.05);情感观点采择能力与总智商正相关(r=0.33,P<0.01),与社交反应量表得分及执行功能评定量表得分负相关(r=-0.32、-0.03,P<0.05)。结论:ASD儿童认知及情感观点采择均存在缺陷,其观点采择能力与智力水平、社交反应能力和执行功能低下相关。

关键词：孤独症谱系障碍观点采择社交能力执行功能智商

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还原型烟酰胺腺嘌呤二核苷酸氧化酶-4在成骨细胞凋亡中的作用

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中华骨科杂志 2018年第12期38卷 742-751页

作者：张华峰白树财徐倩李晖李东李呈凯宋秀钢秦亚飞马信龙天津医科大学总医院骨科 300052 天津医科大学研究生院 300070 天津中医药大学基础实验教学部 300193 天津市天津医院 300211

目的探讨高浓度地塞米松（dexamethasone，DEX）激活还原型烟酰胺腺嘌呤二核苷酸（nicotinamide adenine dinucleotide phosphate-reduced, NADPH）氧化酶-4（NADPH oxidase 4，Nox4）途径产生氧自由基对成骨细胞凋亡的影响和作用机制... 详细信息

目的探讨高浓度地塞米松（dexamethasone，DEX）激活还原型烟酰胺腺嘌呤二核苷酸（nicotinamide adenine dinucleotide phosphate-reduced, NADPH）氧化酶-4（NADPH oxidase 4，Nox4）途径产生氧自由基对成骨细胞凋亡的影响和作用机制。方法设正常对照组，DEX组，DEX＋N-乙酰半胱氨酸（n-aeetylcysteine，NAC）组，NAC组，DEx＋二亚苯基碘（diphenyleneiodonium chloride，DPI）组，DPI组。干预培养24h后，倒置显微镜下观察成骨细胞形态；MTT法检测细胞活性；荧光探针DCFH-DA检测细胞内氧自由基水平；Hoechst染色检测成骨细胞凋亡；荧光定量PCR及Western-Blot检测Nox4／NADPH氧化酶基因和蛋白的表达；Nox4 siRNA沉默细胞内Nox4／NADPH氧化酶表达后，通过荧光探针检测氧自由基水平。结果采用1000nmol／L地塞米松处理成骨细胞，按照实验分组干预培养24h，倒置相差显微镜下观察和MTT结果提示，与正常对照组相比，DEX组成骨细胞出现明显的皱缩、变形，细胞存活率显著降低，加入NAC或DPI后细胞形态良好，生长旺盛。荧光探针检测结果显示，DEX组成骨细胞内氧自由基生成（45．14％±1．49％）与正常对照组（5．86％±0．28％）相比，差异有统计学意义（P=0．000）；Hoechst染色结果显示，DEX组成骨细胞凋亡（29．60％±1．52％）与正常对照组（4．12％±0．67％）相比，差异有统计学意义（P=0．000）。DEX组成骨细胞内氧自由基生成与DEX＋NAC组（28．06％±1．61％）和DEX＋DPI组（23．70％±1．28％）相比，差异均有统计学意义（均P=0．000），提示NAC或DPI显著降低了成骨细胞内氧自南基的产生。DEX组成骨细胞凋亡与DEX＋NAC组（8．94％±1．47％）和DEX＋DPI组（12．96％±2．03％）相比，差异均有统计学意义（均P=0．000），提示NAC或DPI显著降低了成骨细胞凋亡。Nox4的荧光定量PCR显示DEX组Nox4的基因表达是正常对照组的2．67倍（t=-10．301，P=0．009），Western Blot检测显示DEX组Nox4的蛋白表达是正常对照组的2．37倍（t=-15．542，P=0．004），差异有统计学意义。进一步通过Nox4 siRNA靶向沉默Nox4的表达，DEX＋Nox4 siRNA组成骨细胞内氧自由基的生成（14．53％±1．00％）比DEX组（31．45％±0．72％）降低了16．92％，两者比较差异有统计学意义（P=0．000）。结论Nox4介导的氧自由基生成在高浓度地塞米松诱导成骨细胞凋亡过程中起重要作用，Nox4可能是糖皮质激素性股骨头坏死治疗过程中的重要靶点。

关键词：地塞米松细胞凋亡活性氧 NADPH氧化酶

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