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Inﬂuence Mechanism of Process Parameters on Relative Density, Influence Mechanism of Process Parameters on Relative Density, Microstructure, and Mechanical Properties of Low Sc-Content Al-Mg-Sc-Zr Alloy Fabricated by Selective Laser Melting

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Chinese Journal of Mechanical Engineering(Additive Manufacturing Frontiers) 2022年第4期1卷 3-15页

作者： Di Wang Yongwei Feng linqing liu Xiongmian Wei Yongqiang Yang Pan Yuan Yang liu Changjun Han Yuchao Bai School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou510641China Faculty of Mechanical Engineering and Mechanics Ningbo UniversityNingbo315211China Department of Mechanical Engineering National University of SingaporeSingapore117575Singapore

Additive manufacturing of Al-Mg-Sc-Zr alloys is a promising technique for the fabrication of lightweight components with complex *** this study,the effect of the process parameters of selective laser melting(SLM)on the surface morphology,relative density,microstructure,and mechanical properties of Al-Mg-Sc-Zr high-strength aluminum alloys with low Sc content was systematically *** results show that the energy density has an important effect on the surface quality and densification behavior of the Al-Mg-Sc-Zr alloy during the SLM *** the energy density increased,the surface quality and the number of internal pores ***,the area of the fine-grained region at the boundary of the molten pool gradually *** the laser energy density was set to 151.52 J/mm3,a low-defect sample with a relative density of 99.2%was *** heat treatment,the area of the fine grains at the boundary increased significantly,thereby contributing to the excellent mechanical *** microstructure was characterized by a unique“fan-shaped”heterogeneous *** the energy density increased,the microhardness first increased and then decreased,reaching a maximum value of 122 *** the optimized process parameters,the yield strength(YS),ultimate tensile strength(UTS),and elongation of the as-built Al-Mg-Sc-Zr alloys were 346.8±3.0 MPa,451.1±5.2 MPa,14.6%±0.8%,*** heat treatment at 325°C for 8 h,the hardness increased by 38.5%to 169 HV0.3,and the YS and UTS increased by 41.3%and 18.1%,respectively,to 490.0±9.0 MPa and 532.7±7.8 MPa,respectively,while the elongation slightly decreased to 13.1%±0.7%.

关键词： Selective laser melting Al-Mg-Sc-Zr alloy Process parameter Relative density Microstructure Mechanical property Surface morphology

Interfacial Characteristics and Formation Mechanisms of Copper–steel Multimaterial Structures Fabricated via Laser Powder Bed Fusion Using Different Building Strategies

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Chinese Journal of Mechanical Engineering(Additive Manufacturing Frontiers) 2022年第3期1卷 80-90页

作者： linqing liu Di Wang Guowei Deng Yongqiang Yang Jie Chen Jinrong Tang Yonggang Wang Yang liu Xusheng Yang Yicha Zhang School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou510641China Laboratory of Impact and Safety Engineering Ministry of EducationNingbo UniversityNingbo315211China State Key Laboratory of Ultra-precision Machining Technology Department of Industrial and Systems EngineeringThe Hong Kong Polytechnic UniversityHong KongChina Department of Design&Mechanical Engineering University of Technology Belfort-MontbéliardSevenansFrance

Laser powder bed fusion(LPBF)is an innovative method for manufacturing multimaterial components with high geometrical *** LPBF-printing sequences of materials may be diverse in the actual design and application of multimaterial *** this study,multimaterial copper(CuSn10)–steel(316 L)structures are printed using different building strategies(printing 316 L on CuSn10 and printing CuSn10 on 316 L)via LPBF,and the characteristics of two interfaces(the 316 L/CuSn10 or“L/C”and CuSn10/316 L or“C/L”interfaces)are ***,the interfacial melting mode and formation mechanisms are *** the L/C interface,the keyhole melting mode induced by the high volumetric energy density(EL/C=319.4 J/mm3)results in a large penetration depth in the pre-solidified layer and enhances laser energy absorption,thus promoting the extensive migration of materials and intense intermixing of elements to form a wide diffusion zone(∼400μm).At the C/L interface,the conduction mode induced by the low volumetric energy density(EC/L=74.1 J/mm3)results in a narrow diffusion zone(∼160μm).The interfacial defects observed are primarily cracks and *** cracks appeared at the C/L interface,which is attributable to the weak bonding strength of the narrow diffusion *** study provides guidance and reference for the design and manufacturing of multimaterial components via LPBF using different building strategies.

关键词： Multimaterial structures Laser powder bed fusion Building strategies Interfacial characteristics

激光选区熔化成形CuCrZr合金导电率提升机理研究

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机械工程学报 2022年第17期58卷 297-308页

作者：欧远辉王迪刘林青杨永强韩昌骏陶振青伊浩邓澄谭超林吴光正华南理工大学机械与汽车工程学院广州510641 广汽丰田发动机有限公司广州511455 重庆大学机械传动国家重点实验室重庆400044

为了满足制件的高导电性能要求,对激光选区熔化(Selective laser melting,SLM)成形CuCrZr合金的导电率进行研究。首先优化工艺参数获得了致密度为99.37%的试样,然后讨论了致密度和热处理工艺对导电率的影响规律。结果表明,CuCrZr合金的... 详细信息

为了满足制件的高导电性能要求,对激光选区熔化(Selective laser melting,SLM)成形CuCrZr合金的导电率进行研究。首先优化工艺参数获得了致密度为99.37%的试样,然后讨论了致密度和热处理工艺对导电率的影响规律。结果表明,CuCrZr合金的导电率与致密度具有较强的正线性关系;对合金导电率影响较大的热处理参数是固溶温度和时效时间。固溶处理过程中,CuCrZr的导电率随固溶时间增加先略微降低后升高,而随固溶温度升高先大幅度降低后升高。时效过程中,导电率随时效时间增加逐渐升高并趋于稳定;热处理后的冷却速度越慢,合金的导电率越高;CuCrZr合金最佳的热处理制度为1000℃固溶2h并炉冷却至室温,此时合金导电率为91.20%±0.49%IACS。相较于已有研究,系统地分析了热处理工艺对导电率的提升机理并提出调控方向,为增材制造高导电率合金提供参考依据。

关键词：激光选区熔化 CuCrZr合金热处理导电率

Evidential combination of augmented multi-source of information based on domain adaptation

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Science China(Information Sciences) 2020年第11期63卷 38-55页

作者： linqing HUANG Zhunga liu Quan PAN Jean DEZERT School of Automation Northwestern Polytechnical University ONERA-The French Aerospace Lab

In the applications of domain adaptation(DA), there may exist multiple source domains, and each source domain usually provides some auxiliary information for object classification. The combination of such complementary knowledge from different source domains is helpful for improving the accuracy. We propose an evidential combination of augmented multi-source of information(ECAMI) method. The information sources are augmented at first by merging several randomly selected source domains to generate extra auxiliary information. We can obtain one piece of classification result with the assistance of each information source based on DA. Then these multiple classification results are combined by belief functions theory, which is expert at dealing with the uncertain information. Nevertheless, the classification results derived from different information sources may have different weights. The optimal weights are calculated by minimizing an given error criteria defined by the distance between the combination result and the ground truth using some training data. For each object, the augmented information sources will produce multiple classification results that will be discounted by the learnt weights under the belief functions framework. Then the combination of these discounted results is employed to make the final class decision. The effectiveness of ECAMI is evaluated with respect to some related methods based on several real data sets, and the experimental results show that ECAMI can significantly improve the classification accuracy.

关键词： information fusion domain adaptation evidence theory belief functions pattern classification

猪ADAMTS1基因的多态性与产仔数性状的关联分析

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养猪 2022年第3期 70-72页

作者：刘林清李庆岗王重龙安徽省农业科学院畜牧兽医研究所畜禽产品安全工程安徽省重点实验室安徽合肥230031

通过比较序列测定法,在ADAMTS1基因第7外显子发现C/G突变,建立了PCR-PvuⅡ-RFLP分型技术,并在淮猪新品系Ⅱ猪种中进行多态性分型,分析其基因型频率和等位基因频率,检测该位点的多态性并与产仔数性状进行关联分析。结果表明,在淮猪新品... 详细信息

通过比较序列测定法,在ADAMTS1基因第7外显子发现C/G突变,建立了PCR-PvuⅡ-RFLP分型技术,并在淮猪新品系Ⅱ猪种中进行多态性分型,分析其基因型频率和等位基因频率,检测该位点的多态性并与产仔数性状进行关联分析。结果表明,在淮猪新品系Ⅱ猪群中,所有胎次产仔数呈现AB>BB>AA的趋势,AB型个体的所有胎次产仔数显著高于BB型个体0.665头(P<0.05)。因此,ADAMTS1基因在淮猪新品系Ⅱ猪群中与产仔数性状显著相关,可能为提高猪产仔数性状提供一个有用的分子标记。

关键词：猪 ADAMTS1 产仔数关联分析

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新型藜麦杂粮面包工艺研究

农产品加工（下） 2017年第1期 24-28页

作者：郝亭亭唐琳清刘瑶付丽红山西农业大学食品科学与工程学院山西太谷030801

为满足多样化、营养型食品需求,拟开发一种新型藜麦杂粮面包。以感官评分、比容、酸度和质构为评价指标,采用单因素试验和正交试验对面包配方进行优化。结果表明,以藜麦粉和面包粉为基重,最佳工艺配方为藜麦粉添加量12%,面包改良剂添加... 详细信息

为满足多样化、营养型食品需求,拟开发一种新型藜麦杂粮面包。以感官评分、比容、酸度和质构为评价指标,采用单因素试验和正交试验对面包配方进行优化。结果表明,以藜麦粉和面包粉为基重,最佳工艺配方为藜麦粉添加量12%,面包改良剂添加量0.35%,白砂糖添加量8.75%,酵母添加量1%,食盐添加量1%,甜蜜素添加量0.20%,鸡蛋添加量5%,黄油添加量3%,水添加量43%。此时,藜麦杂粮面包感官评分93分,酸度4.20°T,比容3.96 m L/g,硬度13.83 N,弹性17.87 mm,咀嚼性102.47 m J。

关键词：藜麦面包配方优化质构分析

老年2型糖尿病患者合并骨质疏松的相关危险因素分析

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中国临床保健杂志 2019年第6期22卷 786-789页

作者：刘林青王娟胡世莲顾朋颖中国科技大学附属第一医院(安徽省立医院)老年医学科

目的分析老年2型糖尿病患者合并骨质疏松的相关危险因素。方法收集124例年龄≥65岁的2型糖尿病患者病历资料。根据骨密度检测结果,分为骨质正常组和骨密度降低组(包括骨量减少组和骨质疏松组),其中骨质正常者40例,骨密度降低组84例。对... 详细信息

目的分析老年2型糖尿病患者合并骨质疏松的相关危险因素。方法收集124例年龄≥65岁的2型糖尿病患者病历资料。根据骨密度检测结果,分为骨质正常组和骨密度降低组(包括骨量减少组和骨质疏松组),其中骨质正常者40例,骨密度降低组84例。对这两组患者的性别、糖尿病病程、体质指数(BMI)、空腹血糖(FBG)、糖化血红蛋白(HbA1c)、血钙(Ca)、血磷(P)、血尿酸(UA)、总胆固醇(TC)、25-羟基维生素D[25-(OH)D3]指标进行比较分析。结果老年2型糖尿病患者合并骨密度降低组的女性比例明显高于男性比例(P=0.022)。多因素logistic回归分析得出:糖尿病病程、BMI、HbA1c、P、25-(OH)D3均是老年2型糖尿病患者合并骨质疏松的独立危险因素(P<0.05)。结论长糖尿病病程、低BMI、高HbA1c、高P、低25-(OH)D3是老年2型糖尿病患者合并骨质疏松的危险因素。

关键词：糖尿病,2型骨质疏松危险因素老年人

基于边缘计算的智能电能表能耗与寿命优化方法

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电测与仪表 2023年第5期60卷 173-179页

作者：刘林青马红明李鹏段子荷李梦宇邓芳明国网河北省电力有限公司营销服务中心石家庄050022 国网河北省电力有限公司石家庄050022 华东交通大学电气与自动化工程学院南昌330013

针对智能电能表在大规模使用后出现的寿命异常缩短,能耗异常增高问题。提出了一种基于边缘计算的智能电能表能耗与寿命优化方案。使用边缘服务器接收和上传智能电能表数据,在边缘端通过卷积神经网络(CNN)提取能耗与寿命的影响因子,采用K... 详细信息

针对智能电能表在大规模使用后出现的寿命异常缩短,能耗异常增高问题。提出了一种基于边缘计算的智能电能表能耗与寿命优化方案。使用边缘服务器接收和上传智能电能表数据,在边缘端通过卷积神经网络(CNN)提取能耗与寿命的影响因子,采用K-means聚类算法预测用电量变化从而得到能耗与寿命优化模型。仿真结果表明,在基于边缘计算的能耗与寿命优化环境中,优化的1000个智能电能表的使用寿命提高了30%,总能耗降低了26%。为智能电能表长期稳定工作提供了一种研究方法。

关键词：智能电能表边缘计算 CNN K-means聚类算法

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基于大数据的专变客户用能健康状态综合评价

智慧电力 2021年第12期49卷 96-103页

作者：王立斌孙寻航杨迪董彦军刘林青段子荷国网河北省电力有限公司河北石家庄050000 西安交通大学(智能网络与网络安全教育部重点实验室) 自动化科学与工程学院陕西西安710049 国网河北省电力有限公司营销服务中心河北石家庄050000 国网邢台供电分公司河北邢台054000

提出了一种基于大数据的专变客户用能健康状态综合评价模型。首先从用能安全、经济效益和可靠性3个方面建立专变客户用能健康状态评价指标体系;进而利用改进层次分析法和熵权法对评价指标进行组合赋权;然后利用灰色关联度和马氏距离对... 详细信息

提出了一种基于大数据的专变客户用能健康状态综合评价模型。首先从用能安全、经济效益和可靠性3个方面建立专变客户用能健康状态评价指标体系;进而利用改进层次分析法和熵权法对评价指标进行组合赋权;然后利用灰色关联度和马氏距离对理想解法进行改进,借助改进理想解法实现评价对象的综合排序,再结合秩和比法将评价对象分档,实现目标客户的筛选。基于某省电网专变客户的实际数据,验证了所提评价模型的可行性与有效性,并为目标客户制定了针对性用能改进策略。

关键词：能源互联网大数据专变客户用能健康状态综合评价