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Investigation on the Novel High-performance Copper/Graphene Composite Conductor for High Power Density Motor

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CES Transactions on Electrical Machines and Systems 2024年第1期8卷 80-85页

作者： Jiaxiao Wang Tingting Zuo jiangli xue Yadong Ru Yue Wu Zhuang Xu Yongsheng Liu Zhaoshun Gao Puqi Ning Tao Fan Xuhui Wen Li Han Liye Xiao Shanghai University of Electric Power Shanghai 200090Chinaand the Institute of Electrical EngineeringChinese Academy of SciencesShanghai 200090China the Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China with Shanghai University of Electric Power Shanghai 200090China

High-performance Cu/Graphene composite wire synergistically strengthened by nano Cr_(3)C_(2) phase was directly synthesized via hot press sintering followed by severe cold plastic deformation, using liquid paraffin and CuCr alloy powder as the raw materials. Since graphene is in situ formed under the catalysis of copper powder during the sintering process, the problem that graphene is easy to agglomerate and difficult to disperse uniformly in the copper matrix has been solved. The nano Cr_(3)C_(2)-particles nailed at the interface favor to improve the interface bonding. The Cu/Graphene composite possesses high electrical conductivity, hardness, and plasticity. The composite wire exhibits high electrical conductivity of 96.93% IACS, great tensile strength of 488MPa, and excellent resistance to softening. Even after annealing at 400℃ for 1 h, the tensile strength can still reach 268 MPa with a conductivity of about 99.14% *** wire's temperature coefficient of resistance(TCR) is largely reduced to 0.0035/℃ due to the complex structure,which leads the wire to present low resistivity at higher temperatures. Such Cu/Graphene composite wire with excellent comprehensive performance has a good application prospect in high-power density motors.

关键词： Cu/Graphene composite Mechanical properties Electrical property Microstructure Temperature coefficient of resistance

A general synthesis strategy for the multifunctional 3D polypyrrole foam of thin 2D nanosheets

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Frontiers of Materials Science 2018年第2期12卷 105-117页

作者： jiangli xue Maosong MO Zhuming LIU Dapeng YE Zhihua CHENG Tong XU Liangti QU Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China College of Mechanical and Electronic Engineering Fujian Agriculture and Forestry University Fuzhou 350002 China Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials Key Laboratory of Cluster Science (Ministry of Education) Beijing Institute of Technology Beijing 100081 China

A 3D macroporous conductive polymer foam of thin 2D polypyrrole （PPy） nanosheets is developed by adopting a novel intercalation of guest （monomer Py） between the layers of the lamellar host （3D vanadium oxide foam） template-replication strategy. The 3D PPy foam of thin 2D nanosheets exhibits diverse functions including reversible compressibility, shape memory, absorption/adsorption and mechanically deformable supercapacitor characteristics. The as-prepared 3D PPy foam of thin nanosheets is highly light weight with a density of 12 mg·cm^-3 which can bear the large compressive strain up to 80% whether in wet or dry states; and can absorb organic solutions or extract dye molecules fast and efficiently. In particular, the PPy nanosheetbased foam as a mechanically deformable electrode material for supercapacitors exhibits high specific capacitance of 70 F·g^-1 at a fast charge-discharge rate of 50 mA·g^-1, superior to that of any other typical pure PPy-based capacitor. We envision that the strategy presented here should be applicable to fabrication of a wide variety of organic polymer foams and hydrogels of low-dimensional nanostructures and even inorganic foams and hydrogels of low-dimensional nanostructures, and thus allow for exploration of their advanced physical and chemical properties.

关键词： intercalation polymerization polypyrrole nanosheet supercapacitor foam multifunctionality

热压烧结及轧制工艺对CuCr/CNTs复合材料组织与性能的优化

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材料导报 2021年第2期35卷 2078-2085页

作者：李健左婷婷薛江丽茹亚东赵兴科高召顺韩立肖立业北京科技大学材料科学与工程学院北京100083 中国科学院电工研究所多学科交叉研究中心北京100190 中国科学院洁净能源创新研究院大连116000 中国科学院电工研究所微纳加工技术与智能电气设备研究部北京100190

基于电工材料高电导、高强度的发展需求,本工作通过粉末真空热压烧结成功制备出微量Cr元素掺杂的功能化碳纳米管增强铜基复合材料(CuCr/CNTs),系统研究了热压烧结及轧制工艺对复合材料电导率和力学性能的影响。研究发现,在烧结温度为90... 详细信息

基于电工材料高电导、高强度的发展需求,本工作通过粉末真空热压烧结成功制备出微量Cr元素掺杂的功能化碳纳米管增强铜基复合材料(CuCr/CNTs),系统研究了热压烧结及轧制工艺对复合材料电导率和力学性能的影响。研究发现,在烧结温度为900℃、保温1 h、保压压力为50 MPa的工艺下,样品的电导率高达96.2%IACS,硬度为73.0HV。通过对微观组织与性能的分析,发现热压烧结工艺显著影响基体晶粒的尺寸以及界面处碳化物的数量,界面处适量Cr 3C 2纳米相的存在可以改善界面润湿性,增强界面结合,有利于电流传递和载荷传递。通过进一步冷轧,CNTs定向排列并均匀分散,样品的电导率和力学性能均有提升,在电导率保持96.6%IACS时,其屈服强度可达311 MPa,拉伸强度达到373 MPa,具有非常好的工程应用前景。

关键词： Cu/CNTs复合材料真空热压烧结轧制界面结构电导率力学性能

激光显微共聚焦拉曼光谱仪变温系统的设计与研制

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低温与超导 2022年第4期50卷 13-18,74页

作者：伍岳高召顺薛江丽李艳丽孔祥东左婷婷茹亚东许壮韩立肖立业中国科学院电工研究所北京100190 中国科学院大学北京100049

针对常规激光显微共聚焦拉曼光谱仪无法满足物质变温,特别是低温测试需求的问题,设计了适用于拉曼光谱仪的高精度变温系统。该系统采用GM制冷机作为制冷源,利用高纯无氧铜作为导冷介质,通过将GM制冷机的冷量传导至样品台,并利用控温仪... 详细信息

针对常规激光显微共聚焦拉曼光谱仪无法满足物质变温,特别是低温测试需求的问题,设计了适用于拉曼光谱仪的高精度变温系统。该系统采用GM制冷机作为制冷源,利用高纯无氧铜作为导冷介质,通过将GM制冷机的冷量传导至样品台,并利用控温仪进行温度控制,可以实现待测样品10 K-402 K范围的温度变化控制,控温精度高于0.008 K。相比于常规的低温测试设备,该系统无需采用液氮、液氦进行制冷,大幅降低了设备的使用及维护费用。同时,使用激光显微共聚焦拉曼光谱仪搭载该系统,成功获得了Si、V_(2)O_(5)等材料的变温拉曼光谱,验证了激光显微共聚焦拉曼光谱仪变温系统设计的可靠性。

关键词：拉曼光谱仪变温系统低温

Machine learning assisted prediction of dielectric temperature spectrum of ferroelectrics

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Journal of Advanced Ceramics 2023年第9期12卷 1793-1804页

作者： Jingjin He Changxin Wang Junjie Li Chuanbao Liu Dezhen xue jiangli Cao Yanjing Su Lijie Qiao Turab Lookman Yang Bai Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Institute for Advanced Material and Technology University of Science and Technology BeijingBeijing 100083China Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China Sichuan Province Key Laboratory of Information Materials and Devices Application College of Optoelectronic EngineeringChengdu University of Information TechnologyChengdu 610225China School of Materials Science and Technology University of Science and Technology BeijingBeijing 100083China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China AiMaterials Research LLC Santa FeNM 87501USA

In material science and engineering,obtaining a spectrum from a measurement is often time-consuming and its accurate prediction using data mining can also be *** this work,we propose a machine learning strategy based on a deep neural network model to accurately predict the dielectric temperature spectrum for a typical multi-component ferroelectric system,i.e.,(Ba_(1−x−y)Ca_(x)Sr_(y))(Ti_(1−u−v−w)Zr_(u)Sn_(v)Hf_(w))O_(3).The deep neural network model uses physical features as inputs and directly outputs the full spectrum,in addition to yielding the octahedral factor,Matyonov–Batsanov electronegativity,ratio of valence electron to nuclear charge,and core electron distance(Schubert)as four key *** to the physically meaningful features,our model exhibits better performance and generalization ability in the broader composition space of BaTiO3-based solid *** the prediction accuracy is superior to traditional machine learning models that predict dielectric permittivity values at each ***,the transition temperature and the degree of dispersion of the ferroelectric phase transition are easily extracted from the predicted spectra to provide richer physical *** prediction is also experimentally validated by typical samples of(Ba_(0.85)Ca_(0.15))(Ti_(0.98–x)Zr_(x)Hf_(0.02))O_(3).This work provides insights for accelerating spectra predictions and extracting ferroelectric phase transition information.

关键词： machine learning(ML) dielectric temperature spectrum ferroelectrics phase transition information

广州地区性病门诊就诊者生殖支原体感染状况分析

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实用医学杂志 2024年第10期40卷 1434-1439页

作者：徐磊蓝银苑吴茜黄进梅何政强方铭恒欧江丽吴兴中薛耀华杨斌南方医科大学公共卫生学院广州510515 南方医科大学皮肤病医院广州510091

目的了解广州地区性病门诊就诊者生殖支原体(MG)感染状况,以期为临床诊疗和实验室筛查提供流行病学依据。方法采用实时荧光聚合酶链反应对2019年7月至2021年12月在南方医科大学皮肤病医院性病门诊2722例就诊者的2749份临床标本进行了MG ... 详细信息

目的了解广州地区性病门诊就诊者生殖支原体(MG)感染状况,以期为临床诊疗和实验室筛查提供流行病学依据。方法采用实时荧光聚合酶链反应对2019年7月至2021年12月在南方医科大学皮肤病医院性病门诊2722例就诊者的2749份临床标本进行了MG DNA检测,同时对其中的2382例就诊者进行了沙眼衣原体(CT)和淋病奈瑟菌(NG)DNA的检测,收集并分析患者尿道炎和宫颈炎等临床症状与MG感染的相关性。结果2722例性病门诊就诊者,共检测生殖支原体阳性感染者120例,总体阳性率为4.4%,其中男性生殖支原体阳性率为4.9%(87/1790),女性为3.5%(33/932)。随着年龄的增大,阳性率降低。女性18~25岁组阳性率最高,为6.4%(18/281);男性≥46岁组阳性率最低,为1.5%(5/342),各年龄组生殖支原体阳性率差异有统计学意义(P<0.05)。有尿道炎症状的男性就诊者MG检出率为7.3%(42/574),显著高于无尿道炎症状就诊者(3.7%,45/1216)。79例男性MG阳性患者中,MG单一感染占89.9%(71/79)。26例女性MG阳性患者中,MG单一感染占61.5%(16/26)。女性MG与CT合并感染率为1.2%,男性为0.3%,差异有统计学意义(P<0.05)。结论广州地区性病门诊就诊者MG阳性率相对较高,尤其是年轻人群,同时存在常见病原体的混合感染。应加强性病门诊患者MG早期筛查和监测的力度,以减少高危性活跃人群中MG感染的传播。

关键词：生殖支原体流行核酸扩增试验性传播疾病合并感染

冻存温度、冻融次数和冻存时间对血清生化指标稳定性的影响

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转化医学杂志 2018年第4期7卷 212-217页

作者：范泽涵章月蟾索晨徐珂琳薛江莉李淑元袁子宇王久存金力陈兴栋复旦大学生命科学学院现代人类学教育部重点实验室上海200438 复旦大学遗传工程国家重点实验室、遗传与发育协同创新中心上海200438 复旦大学数据学院、遗传与发育协同创新中心上海200438 复旦大学泰州健康科学研究院江苏泰州225300 上海交通大学医学院附属国际和平妇幼保健院生殖遗传科、上海交通大学医学院胚胎源性疾病研究所上海200030

目的分析在生物样本库中,冻存温度、冻存时间及反复冻融效应对血清常规生化指标的影响,以探讨血清常规生化指标在生物样本库中的稳定性。方法以2014年7月江苏省泰兴市人民医院160例健康体检者为研究对象,取空腹静脉血制备混合血清。24 ... 详细信息

目的分析在生物样本库中,冻存温度、冻存时间及反复冻融效应对血清常规生化指标的影响,以探讨血清常规生化指标在生物样本库中的稳定性。方法以2014年7月江苏省泰兴市人民医院160例健康体检者为研究对象,取空腹静脉血制备混合血清。24 h内检测新鲜混合血清的12项常规生化指标作为基准值。将混合血清样本随机分组:A组贮存于-20℃,B组、C组、D组、E组均贮存于-80℃,其中C组、D组、E组分别于冻存开始的1、5、10 d内,每天进行一次冻融处理。在第1,3,5,7,9个月时进行重复检测。运用配对t检验比较各时点检测值与基准值的差异,运用线性混合效应模型分析冻存温度、冻融循环次数、冻存时间效应对各指标含量稳定性的影响。结果 9个月的冻存中,12项生化指标的含量均不稳定。导致含量不稳定的因素有冻存温度、反复冻融次数、冻存时间,冻存温度、冻融次数与冻存时间分别产生的交互效应。结论血清样本不宜在生物样本库中冻存,应选择新鲜样本进行血清常规生化指标的检测,否则会降低检测结果的准确性。

关键词：生物样本库血清生化指标温度反复冻融

Diagnostic and Therapeutic Analysis to 5 Cases of Male Breast Cancer

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The Chinese-German Journal of Clinical Oncology 2002年第3期1卷 175-176页

作者： jiangli xueXinbo 等 DepartmentofGeneralSurgery TongjiHospitalTnognjiMedicalCollegeHuazhongUniversityofScienceandTechnologyWuhan430030China DepartmentofGeneralSurgery TongjiHospitalTnognjiMedicalCollegeHuazhongUnive

Objective to retrospectively review the characteristics and the diagnostic and therapeutic procedure of 5 cases of male breast *** To select 5 cases of male breast carcinoma of 1057 patients admitted in our hospital between 1992 and 2002 who suffered breast *** The incidence of breast cancer is low,ages of patients, are old,The major pathological type was infiltrative ductal *** mastectomy is the primary treatment,accompanied,accompanied with adjuvant therapy such as chemotherapy,radiotherapy and antiestrogen therapy,Conclusion Male breast cancer has low incidence,low differentiation,and early metastasis,Patients should accept systemic treatment,and the primary treatment is radical mastectomy.

关键词：男性乳腺癌根治术诊断治疗淋巴结转移

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木质素分级对其应用性能的影响

化工学报 2022年第5期73卷 1894-1907页

作者：王江丽薛敏赵承科岳凤霞华南理工大学轻工科学与工程学院制浆造纸工程国家重点实验室广东广州510640

木质素是一种结构复杂的天然芳香类聚合物,功能基团丰富,具有良好的开发应用前景。工业碱木质素是当前木质素转化利用的主体,主要源于制浆黑液。由于原料来源、制浆工艺的影响,木质素多分散性高、结构与性能不一,致使相应的木质素基产... 详细信息

木质素是一种结构复杂的天然芳香类聚合物,功能基团丰富,具有良好的开发应用前景。工业碱木质素是当前木质素转化利用的主体,主要源于制浆黑液。由于原料来源、制浆工艺的影响,木质素多分散性高、结构与性能不一,致使相应的木质素基产品的均一性与稳定性较差。通过木质素分级可以获得具有不同分子量或特定化学结构特征的木质素级分,促使各级分的多分散性降低、均一性提高,进而针对特定性能的级分进行改性或者直接利用可进一步提高产品的稳定性。对现行木质素的主要分级方式进行了总结,重点探讨了工业碱木质素的分级方式对其后续利用的影响及存在问题。最后,针对木质素不同级分的特点对木质素未来分级的方向及应用前景提出了展望。

关键词：木质素分级碱木质素分子量多分散性膜分级分离纯化

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