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60 MW级空冷发电机电磁设计及试验验证

电机技术 2024年第1期 11-12,18页

作者：李翊一上海电气电站设备有限公司发电机厂 200240

随着能源结构的改变,小空冷发电机市场逐渐成为行业关注的重点。文章介绍了60 MW级空冷发电机电磁设计方案,并通过型式试验验证了发电机的主要电气性能,结果符合预期,发电机整体性能优良。

关键词：分布式能源 60 MW级空冷发电机电磁设计

安徽省医疗废物产生量的时空变化趋势及其影响因素

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环境工程学报 2024年第6期18卷 1713-1722页

作者：孙明珍杨婷孟晶晶李依依安徽医科大学卫生管理学院合肥230032

从省、市等不同层级视角,利用空间自相关模型,分析了安徽省医疗废物产生量的时空演变趋势。在此基础上,运用地理探测器模型分析了经济发展水平、人口状况、医疗卫生水平等相关因素对医疗废物产生量的影响程度及其交互作用,并进一步运用G... 详细信息

从省、市等不同层级视角,利用空间自相关模型,分析了安徽省医疗废物产生量的时空演变趋势。在此基础上,运用地理探测器模型分析了经济发展水平、人口状况、医疗卫生水平等相关因素对医疗废物产生量的影响程度及其交互作用,并进一步运用GM(1,1)模型对安徽省16个地级市未来4年的医疗废物产生量进行预测分析。结果表明,安徽省各地市的医疗废物产生量在空间上存在显著差异,但空间聚集效应不显著,常住人口、医院病床数、医疗卫生技术人员数和人均地区生产总值等因素对医疗废物的产生具有显著影响,其中常住人口的影响最为显著。未来,安徽省医疗废物产生量将呈现持续增长的趋势,在近年来各类突发性传染病疫情的背景下,各城市应注重加强医疗废物应急处置能力及其韧性水平提升。结果可以为医疗废物的有效管理提供有益借鉴。

关键词：医疗废物时空变化影响因素空间自相关模型地理探测器

Modeling of Solidification Microstructures Based on Fully Coupling of Macro-transport Phenomena with Cellular Automata

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Journal of Materials Science & Technology 2000年第6期16卷 568-572页

作者： Qiang DU DianZhong li yiyi li Institute of Metal Research Chinese Academy of SciencesShenyang 110015China

This paper has attempted to simulate the microstructure formation based on fully coupling of temperature field, concentration field and velocity field with micro-kinetics. The authors presented a new way, which is the combination of FDM and cellular automata (CAFD) to visualize the microstructure formation of the thin complex superalloy turbine blades cast by the vacuum investment process. The distribution, orientation and mechanism of the heterogeneous nucleation, the growth kinetics of dendrites and the columnar to equiaxed transition (CET) are considered. Capitalizing on these simulating schemes, the comprehensive influence of key process variables on the scale and uniformity of grains has been investigated quantitatively. The simulated grain size and morphology agree well with the experimental results.

关键词： Microstructure

Microstructural evolution and stress relaxation cracking mechanism for Super304H austenitic stainless steel weld metal

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Journal of Materials Science & Technology 2022年第5期100卷 82-90页

作者： Xiaopeng Xiao Dianzhong li yiyi li Shanping Lu Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Key Laboratory of Nuclear Materials and Safety Assessment Insititute of Metal ResearchChinese Academy of SciencesShenyang 110016China

The pre-compressed CT technique was used to quantitatively investigate the formation of stress relaxation cracks under different tensile residual stresses and aging time in Super304H austenitic stainless steel weld *** statistical results revealed that intergranular cracks could occur within 2000 h under 650℃ when the residual stress was applied with greater than 18 KN pre-compression *** grain interior and boundary analyses showed that the growth of intragranular Cu-rich particles could induce a strong grain interior,and the intergranular Nb(C,N)carbides were one of the causes to crack under short-term aging *** long-term aging time conditions,the intergranular M_(23)C_(6)carbides were more susceptible to crack than intergranular Nb(C,N)***,the mechanism responsible for stress relaxation cracking formation was carefully illustrated for the weld metals after short-term aging and long-term aging,respectively.

关键词： Stress relaxation cracking Super304H steel Weld metal Aging treatment Residual stress Precipitates

营销互动中拟人化对消费者态度的影响研究与展望

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商业经济 2024年第8期 62-66页

作者：李焱李小妮李伊一李强兰州财经大学信息工程与人工智能学院甘肃兰州730020 甘肃省智慧商务重点实验室甘肃兰州730020

通过赋予品牌或产品人格特征和情感元素,拟人化能够与消费者建立更加紧密的情感联系,提升品牌形象和市场竞争力。本研究以拟人化的概念维度和研究对象着手,梳理现有研究中拟人化对消费者态度的正面影响和负面影响,进而归纳出拟人化对消... 详细信息

通过赋予品牌或产品人格特征和情感元素,拟人化能够与消费者建立更加紧密的情感联系,提升品牌形象和市场竞争力。本研究以拟人化的概念维度和研究对象着手,梳理现有研究中拟人化对消费者态度的正面影响和负面影响,进而归纳出拟人化对消费者态度的影响因素。通过梳理与分析得出拟人化在影响消费者态度时,其影响因素可以归结为拟人化设计、个体特征、情境因素、产品属性四个方面。

关键词：拟人化消费者态度人工智能人机交互影响因素

维普期刊数据库博看期刊

Multi-scale study on the heterogeneous deformation behavior in duplex stainless steel

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Journal of Materials Science & Technology 2021年第13期72卷 180-188页

作者： Xiao Zhang Pei Wang Dianzhong li yiyi li Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

The heterogeneous deformation behavior of austenite and ferrite in the 2205 duplex stainless steel was subjected to multiscale analysis based on the in situ synchrotron-based high energy X-ray diffraction,microscopic digital image correlation,electron backscatter diffraction,and transmission electron *** is found that the heterogeneous deformation triggers from the yielding of *** this deformation stage,austenite experiences greater strain in the area near the phase boundaries because of the impeded function of the phase boundaries to *** to the relatively small difference in hardness between the constituent phases,the strain in austenite grains extends into the adjacent ferrite grains when entering into the ferrite yielding *** addition,the strain distribution of the austenite grains is more homogeneous than that of the ferrite grains because of the lower stacking fault energy of austenite,which results in a planar slip,and higher stacking fault energy in case of ferrite,causing cross *** interaction between austenite and ferrite becomes considerably obvious when the strain further increases after both constituent phases yielding because of the back stress and forward stress in austenite and ferrite,respectively,which are generated by the pile-up of the geometrically necessary dislocations.

关键词： Duplex stainless steel Heterogeneous deformation behavior Digital image correlation Back stress Geometrically necessary dislocation

Principles Giving High Penetration under the Double Shielded TIG Process

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Journal of Materials Science & Technology 2014年第2期30卷 172-178页

作者： Dongjie li Shanping Lu Dianzhong li yiyi li Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences

A new welding method named double shielded tungsten inert gas （TIG） has been developed to improve the TIG weld penetration. The main principles to increase the weld depth have been discussed. Results show that the critical oxygen content in the weld pool is around 100 × 10 -6 as the temperature coefficient of surface tension changes from negative to positive. The tracer test using pure silver shows that the direction of Marangoni convection changes as the oxygen content increases in the weld pool. The effect of arc constriction on the weld depth has been evaluated on a water-cooled copper plate, and the result indicates that the torch of double shielded can give a more powerful arc. Heavy oxide on the pool surface has undesirable impacts on the increasing of weld depth as the oxygen excessively accumulates in weld pool. It is possible to form chromium oxide in the weld process, while the iron oxide may form as the weld surface exposes to the air after the shielded gas moving away.

关键词： Marangoni convection Penetration Tungsten inert gas (TIG) Arc Oxide

Effect of Structural Parameters of Double Shielded TIG Torch on the Fusion Zone Profile for 0Cr13Ni5Mo Martensitic Stainless Steel

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Journal of Materials Science & Technology 2014年第9期30卷 922-927页

作者： Dongjie li Shanping Lu Dianzhong li yiyi li Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences

The effects of double shielded TIG （tungsten inert gas） torch＇s structural parameters, including the flow rate ratio between the inner and outer layers of gas and the extended length of the electrode （abbreviated as ELE in this work）, on the fusion zone profile have been investigated for OCrl3NiSMo martensitic stainless steel. Results show that the double shielded TIG process yields relatively high penetration of the weld pool in a broad range of the structural parameters. ELE over 3 mm is too large and causes adverse reactions on the protection of electrode. The outer gas with relatively high flow rate or the outer layer with high oxygen content is conducive to the oxygen dissolved into the arc, which results in the oxidation of the weld pool surface and the electrode tip. The double shielded TIG welded metal was tested and presented good impact property.

关键词： Structural parameters Flow rate Electrode extended length Impact energy

High-temperature Tensile Behavior in Coarse-grained and Fine-grained Nb-containing 25Cr-20Ni Austenitic Stainless Steel

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Acta Metallurgica Sinica(English Letters) 2020年第11期33卷 1455-1465页

作者： Guodong Hu Pei Wan Dianzhong li yiyi li Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences72 Wenhua Road.Shenyang 110016China School of Materials Science and Engineering Universityof Science and Technology of China72 Wenhua RoadShenyang 110016China Centre of Excellence for Advanced Materials Dongguan 523808China Songshan Lake Laboratory for Materials Science Dongguan 523808China

In this study,tensile behavior of Nb-containing 25Cr-20Ni austenitic stainless steels composed of coarse or fine grains has been investigated at temperatures ranging from room temperature to 900℃.Results show that the tensile strength of fine-grained specimens decreases faster than that of coarse-grained specimens,as the test temperature increases from 600℃ to 800℃.The rapidly decreasing tensile strength is attributed to the enhanced dynamic recovery and recrystallization,because additional slip systems are activated,and cross-slipping is accelerated during deformation in fine-grained *** tensile testing at 700-900℃,sigma phases are formed concurrently with dynamic recrystallization in fine-grained *** precipitation of sigma phases is induced by simultaneous recrystallization as the diffusion of alloying elements is accelerated during the recrystallization ***,the minimum ductility is observed in coarse-grained specimens at 800℃,which is caused by the formation of M23C6 precipitates at the grain boundaries.

关键词： Austenitic stainless steels High-temperature tensile properties Grain size Precipitates