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Tool wear performance and surface integrity studies for milling DD5 Ni-based single crystal superalloy

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Science China(Technological Sciences) 2018年第4期61卷 522-534页

作者： GONG YaDong li Qiang li JinGuo liU yin SUN Yao School of Mechanical Engineering & Automation Northeastern University Institute of Metal Research Chinese Academy of Sciences

Based on the results of slot milling experiments on the DD5 Ni-based single crystal superalloy(001) crystal plane along the [110]crystal direction, in this paper, efforts were devoted to investigate the tool wear process, wear mechanism and failure modes of the physical vapor deposition(PVD)-AlTiN and TiAlN coated tools under dry milling and water-based minimum quantity lubrication(MQL) conditions. The scanning electron microscope(SEM) morphological observation and energy dispersive X-ray spectroscopy(EDX) elements analysis methods were adopted. Moreover, under the water-based MQL condition, the surface integrity such as surface roughness, dimensional and shape accuracy, microhardness and microstructure alteration were researched. The results demonstrated that the tool edge severe adhesion with the work material, induced by the high Al content in the PVD-AlTiN coating caused the catastrophic tool tip fracture. In contrast, the PVD-TiAlN tool displayed a steady and uniform minor flank wear, even though the material peeling and slight chipping also occurred in the final stage. In addition, due to the high effective cooling and lubricating actions of the water-based MQL method, the PVD-TiAlN coated tool demonstrated intact tip geometry; consequently it could be repaired and reused even if the failure criterion was attained. Moreover, as the accumulative milling length and the tool wear increased, all indicators of the surface integrity forehand were deteriorated.

关键词： DD5 tool wear performance coating material cooling method surface integrity

New methods of controlled-source electromagnetic detection in China

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Science China Earth Sciences 2020年第9期63卷 1268-1277页

作者： Qingyun DI Guoqiang XUE Changchun yin Xiu li Key Laboratory of Shale Gas and Geoengineering Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Frontier Technology and Equipment Development Center for Deep Resources Exploration Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China College of Geo-exploration Science and Technology Jilin UniversityChangchun 130026China School of Geology Engineering and Geomatics Chang’an UniversityXi’an 710054China

As an important branch of geophysical exploration method,the electromagnetic method with artificial source has advanced rapidly in the past *** methods are classified as airborne electromagnetic method,ground-air electromagnetic method,ground electromagnetic method,and marine electromagnetic *** the years,researchers in China have made significant improvement to the fundamental theory,forward modeling and inverse for series of electromagnetic detection ***,significant progress was made in the development of corresponding *** researched techniques and their developed equipment have been successfully utilized to detect underground targets as deep as 10 ***,there is increasing need for deep resources exploration,urban subsurface study,and prediction,monitoring and detection of geological *** meet the increasing need and catch up with the advanced international level of exploration technologies and developed equipment,there is urgent necessity and requirement to continue developing geophysical methods and the corresponding equipment.

关键词： Controlled-source Electromagnetic method Multiscale Deep earth detection

NiCoLDH nanosheets grown on MOF-derived Co_(3)O_(4) triangle nanosheet arrays for high-performance supercapacitor

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Journal of materials Science & Technology 2021年第3期62卷 60-69页

作者： Xuemin yin Hejun li Ruimei Yuan Jinhua Lu State Key Laboratory of Solidification Processing Carbon/Carbon Composites Research CenterNorthwestern Polytechnical UniversityXi’an 710072China

Hierarchical Co_(3)O_(4)@NiCoLDH nanosheets(NSs)were prepared on carbon cloth through a multistep method,containing Metal-organic frameworks(MOF)-templated thermal annealing and *** triangle-shaped Co_(3)O_(4 NSs)were firstly obtained by thermal treatment of MOF templates in ***,ultrathin NiCoLDH_(NSs)were in-situ electrodeposited on the surface of Co_(3)O_(4NSs),constructing a core-shell *** the unique hierarchical structure,high conductivity of Co_(3)O_(4 NSs)core and large surface area of NiCoLDHNSs shell,the Co_(3)O_(4)@NiCoLDH_(NSs)array served as supercapacitor electrode exhibits excellent electrochemical properties,such as high specific capacitance of 1708 F g^(-1)(850 C g^(-1))at a current density of 1 A g^(-1),good rate capability,and excellent cycling ***,the asymmetric supercapacitor assembled by Co_(3)O_(4)@NiCoLDH_(NSs)and activated carbon,also displays superior electrochemical perfo rmance with high energy density and power ***,the strategy of constructing core-shell structure based on MOF templates could be extended to other electrochemical fields.

关键词： NiCoLDH Co_(3)O_(4) Core-shell Supercapacitor MOF

Multiple-dimensioned defect engineering for graphite felt electrode of vanadium redox flow battery

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Carbon Energy 2024年第2期6卷 143-153页

作者： yingqiao Jiang yinhui Wang Gang Cheng Yuehua li Lei Dai Jing Zhu Wei Meng Jingyu Xi ling Wang Zhangxing He School of Chemical Engineering North China University of Science and TechnologyTangshanChina Tsinghua Shenzhen International Graduate School Institute of Materials ResearchTsinghua UniversityShenzhenChina

The scarcity of wettability,insufficient active sites,and low surface area of graphite felt(GF)have long been suppressing the performance of vanadium redox flow batteries(VRFBs).Herein,an ultra-homogeneous multipledimensioned defect,including nano-scale etching and atomic-scale N,O codoping,was used to modify GF by the molten salt ***_(4)Cl and KClO_(3) were added simultaneously to the system to obtain porous N/O co-doped electrode(GF/ON),where KClO_(3) was used to ultra-homogeneously etch,and O-functionalize electrode,and NH4Cl was used as N dopant,***/ON presents better electrochemical catalysis for VO_(2)+/VO_(2)+ and V3+/V2+ reactions than only O-functionalized electrodes(GF/O)and *** enhanced electrochemical properties are attributed to an increase in active sites,surface area,and wettability,as well as the synergistic effect of N and O,which is also supported by the density functional theory ***,the cell using GF/ON shows higher discharge capacity,energy efficiency,and stability for cycling performance than the pristine cell at 140 ma cm^(−2) for 200 ***,the energy efficiency of the modified cell is increased by 9.7% from 55.2% for the pristine cell at 260 ma cm^(−2).Such an ultra-homogeneous etching with N and O co-doping through“boiling”molten salt medium provides an effective and practical application potential way to prepare superior electrodes for VRFB.

关键词： graphite felt molten salt N O co-doping ultra-homogeneous etching vanadium redox flow battery

帝迈DM79x血细胞分析仪的精密度和准确度情况分析

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实验室检测

实验室检测 2024年第1期2卷 136-144页

作者：肖丽君尹利民黄政瀚孔瑞蔡引昆明市第一人民医院检验科昆明650000

目的通过比对室内质控数据,评估4台DM79x血细胞分析仪在医院检验科每日室内质量控制中最宜工作状态下的精密度和准确度水平,提高检验结果准确性和一致性。方法统计2023年2月份(28天)实验室4台仪器使用原装低、中、高定值质控品以及每日... 详细信息

目的通过比对室内质控数据,评估4台DM79x血细胞分析仪在医院检验科每日室内质量控制中最宜工作状态下的精密度和准确度水平,提高检验结果准确性和一致性。方法统计2023年2月份(28天)实验室4台仪器使用原装低、中、高定值质控品以及每日检测一份随机门诊新鲜患者样本的室内质控数据,项目包括:白细胞(WBC)、红细胞(RBC)、血红蛋白(HGB)、血细胞比容(HCT)、血小板(PLT)、平均红细胞体积(MCV)、平均红细胞血红蛋白量(MCH)、平均红细胞血红蛋白浓度(MCHC),计算平均值(-X)、标准差(S)和变异系数(CV),以变异系数指数(CVI)和标准差指数(SDI)分别作为精密度和准确度评价指标。结果DM79x 4台仪器间室内质控比对,统计分析发现仪器对血细胞分析包括WBC、RBC、HGB、PLT、HCT、MCV、MCH、MCHC 8项参数,每台仪器的CVI不一,SDI室内质控测定结果<2.0,新鲜样本比对数据CVI、SDI的测定值均在要求范围内。结论医院检验科4台DM79x型全自动血细胞分析仪通过比对实验室间室内质量控制数据,具有良好的精密度和高准确度,仪器性能可满足临床实验室的工作需求,且通过患者新鲜样本比对,确保结果在不同仪器的准确性和一致性。

关键词：实验室间比对室内质量控制血细胞分析仪

Polarization characteristics and controllability mechanism of passive scattering elements

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系统工程与电子技术：英文版 2023年第2期34卷 342-349页

作者： GUO Jie yin Hongcheng maN liang li Xin Science and Technology on Electromagnetic Scattering Laboratory Beijing 100854China Beijing Institute of Environmental Features Beijing 100854China

Polarization feature is one of the important features of radar targets,which has been used in many *** this paper,the grid models of some typical foreign moving targets are constructed on the simulation platform,such as glider,cruiser,fixed wing aircraft,and *** electromagnetic scattering characteristics of the moving platforms under the incidence of circular polarization waves are *** typical polarization characteristics which the orthogonal and in-phase components have in the echoes are analyzed and *** on the polarization scattering matrix(PSM)theory,from the point of view of the physical reproduction,the technical status quo that the existing technical approaches are difficult to realize the passive simulation of polarization characteristic of the target is *** solve this problem,combined with the vector synthesis law,the realization mechanism of controllable polarization characteristic of target echoes is proposed,the analytical expressions of polarization control matrix and polarization ratio are deduced,and the controllability of polarization ratio feature in the case of circular polarization is verified by simulation calculation.

关键词： polarization characteristic physical reproduction passive scattering element controllability mechanism radar feature simulation

maFA-PDX1过表达慢病毒感染人脐带间充质干细胞向胰岛素分泌细胞的分化

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中国组织工程研究 2024年第7期28卷 1000-1006页

作者：邱晓燕李碧欣黎敬弟范垂钦马廉王鸿武汕头大学医学院第二附属医院儿科广东省汕头市515041 深圳市儿童医院儿科研究所广东省深圳市518038 广州医科大学第三附属医院(广州医科大学妇女儿童医院) 广东省广州市512000 汕头大学医学院干细胞研究中心广东省汕头市515041

背景:干细胞来源胰岛β细胞移植被认为是治疗1型糖尿病的有效手段。人脐带间充质干细胞是理想的细胞来源,但其向胰岛β细胞分化的效率不高。目的:研究maFA、PDX1修饰促进人脐带间充质干细胞向胰岛素分泌细胞分化的潜能。方法:构建maFA-P... 详细信息

背景:干细胞来源胰岛β细胞移植被认为是治疗1型糖尿病的有效手段。人脐带间充质干细胞是理想的细胞来源,但其向胰岛β细胞分化的效率不高。目的:研究maFA、PDX1修饰促进人脐带间充质干细胞向胰岛素分泌细胞分化的潜能。方法:构建maFA-PDX1过表达慢病毒载体,用细胞形态学、RT-qPCR法、双硫腙染色比较3种方案[方案A:单纯慢病毒组;方案B:先药物(尼克酰胺、β-巯基乙醇)诱导再加慢病毒组;方案C:慢病毒和药物诱导同时进行组]诱导人脐带间充质干细胞分化为胰岛素分泌细胞的效率和潜能。结果与结论:(1)细胞形态学改变:经3种方案诱导后细胞形态均发生了改变,方案B在诱导第11天细胞聚集生长最为明显,出现聚集生长的胰岛样细胞团;(2)RT-qPCR检测胰岛相关基因的表达差异:同一诱导时间点3种方案横向比较,在诱导第5天,方案C的maFA和PDX1基因表达量最高,方案B的GCG基因表达量最高;在诱导第11天,方案B的maFA、PDX1基因表达量以及INS和GLUT2基因表达量最高;(3)双硫腙染色鉴定锌离子:3种方案诱导第11天部分细胞被双硫腙染成棕红色,其中方案B中部分小岛状细胞被染成棕红色,颜色较深(阳性表达);(4)结果表明,maFA和PDX1共过表达可促进人脐带间充质干细胞向胰岛素分泌细胞分化;maFA-PDX1基因修饰联合药物诱导方案优于单纯基因修饰方案。

关键词：脐带间充质干细胞 maFA PDX1 过表达慢病毒载体胰岛素分泌细胞糖尿病诱导分化

Novel strategy for space group determination in real space

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Journal of materials Science & Technology 2023年第1期132卷 252-259页

作者： Yi Yang Rui li Bingbing yin Qibin Yang School of materials Science and Engineering Xiangtan UniversityXiangtan 411105China

Traditional space group determination methods are all in reciprocal space,which involves ambiguous identification on some space groups which have glide plane and screw *** novel strategy herein for space group determination in real space is based on the atom resolution high angle annular dark field(HAADF)*** HAADF images in three specific crystal zone axes are needed at *** proposed strategy for space group determination is easy and effective.

关键词： Space group Real space HAADF(high angle annular darkﬁeld)

一种结合增强对齐与多注意力融合的偏振视频超分辨方法

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光学技术 2024年第3期50卷 269-276页

作者：徐国明金苗梁栋马健王峰李毅安徽大学互联网学院安徽合肥230039 安徽大学农业生态大数据分析与应用技术国家地方联合工程研究中心安徽合肥230601 偏振光成像探测技术安徽省重点实验室安徽合肥230031 安徽文达信息工程学院智能技术研究所安徽合肥231201

在偏振成像探测中,偏振多通道视频序列给数据传输和处理带来挑战,同时探测精度又依赖高分辨率图像,为此超分辨率计算成像就成为偏振成像探测系统的关键技术。从视频运动特征入手,提出一种结合增强对齐与多注意力融合的偏振视频超分辨率... 详细信息

在偏振成像探测中,偏振多通道视频序列给数据传输和处理带来挑战,同时探测精度又依赖高分辨率图像,为此超分辨率计算成像就成为偏振成像探测系统的关键技术。从视频运动特征入手,提出一种结合增强对齐与多注意力融合的偏振视频超分辨率重建方法。采用三级级联结构实现特征对齐,每一级特征由上一级特征下采样两倍得到,并采用光流引导的可变形卷积进行特征对齐;在融合阶段结合包括时间注意力、空间注意力、通道注意力在内的多种注意力机制,以充分利用通道间依赖性和时空相关性来提升超分辨率重建效果。所提方法与VSR-DUF、RBPN、EDVR、RLSP、RSDN、RRN、DARN、MSAWN等视频超分辨率方法在0°、45°、90°、135°偏振角视频上进行定性和定量对比实验,该实验表明该算法峰值信噪比和结构相似度指标高于其他算法,并且视频帧的高频纹理细节的修复更加丰富,接近偏振成像系统的原始高清图像帧。

关键词：成像探测视频超分辨率深度学习偏振视频注意力机制