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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

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

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Effect of a modified quenching on impact toughness of 52100 bearing steels

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Journal of Materials Science & Technology 2023年第29期160卷 96-108页

作者： Yonghan li Zhonghua Jiang Pei Wang Dianzhong li yiyi li Shenyang National Laboratory for Materials Science Institute of Metal ResearchCASShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China

In order to improve the uniformity of microstructures,and thus enhance the mechanical properties,espe-cially the impact toughness,of 52100 bearing steels,modified quenching heat treatments with different austenitizing processes have been *** results show that 740°C is the optimal holding tem-perature(approaching Ac 1=750°C)to improve the impact toughness of the steel by 37%after quench-ing and low-temperature *** observations reveal that 740°C holding shortens the nucleation incubation period of austenitization phase transformation,and inhibits the overfast growth of austenite in some regions,which leads to simultaneous nucleation and growth of austenite during austen-itizing,and homogeneous dissolution of carbides in different austenite *** changes in microstruc-ture evolution improve the microstructure uniformity(carbide and grain size)after *** distributed carbides and grain size effectively reduce stress concentration and retard crack propagation during impact loading,thus resulting in high impact toughness.

关键词： Austenitizing process Carbides distribution Impact toughness 52100 steels

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界限类偏瘤型麻风伴Ⅱ型麻风反应一例

中国麻风皮肤病杂志 2024年第5期40卷 309-310页

作者：班跃军龚晓莉李依依袁伟遵义医科大学附属医院皮肤科贵州遵义563000

临床资料患者,男,38岁。全身无痛痒性红斑、丘疹、结节1年,左手指麻木伴眉毛、睫毛脱落半年。1年前患者无明显诱因于大腿上出现散在红斑、丘疹、结节,大小不一,无自觉症状。皮损逐渐增多并蔓延至面部、颈部、四肢及腹部,出现大量暗红色... 详细信息

临床资料患者,男,38岁。全身无痛痒性红斑、丘疹、结节1年,左手指麻木伴眉毛、睫毛脱落半年。1年前患者无明显诱因于大腿上出现散在红斑、丘疹、结节,大小不一,无自觉症状。皮损逐渐增多并蔓延至面部、颈部、四肢及腹部,出现大量暗红色斑、丘疹、结节,边界不清,部分破溃、结痂,有脓性分泌物流出,无明显疼痛,部分皮损自行愈合并遗留色素沉着。

关键词：手指麻木睫毛脱落脓性分泌物色素沉着 Ⅱ型麻风反应临床资料自觉症状自行愈合

Precipitation Behavior and Mechanical Properties of a 16Cr-25Ni Superaustenitic Stainless Steel Weld Metal During Post-weld Heat Treatment

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Acta Metallurgica Sinica(English Letters) 2022年第4期35卷 577-590页

作者： Wenbin Tian Dong Wu 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 CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

A 16Cr-25Ni superaustenitic stainless steel weld metal for austenitic stainless steel/ferrite heat-resistance steel dissimilar metal weld was designed and prepared through tungsten inert-gas *** precipitate evolution and its correlation with mechanical properties were investigated during post-weld heat treatment(PWHT)at 690℃ for up to 12 *** primary precipitates in the as-welded weld metal were identified as Mo-rich M6C carbides in the interdendritic region and semicontinuous fine-sized M23C6 carbides along grain *** PWHT,three types of precipitates coexisted in the interdendritic region:primary M6C carbides,newly precipitated Mo-rich M2X carbonitrides and some of the secondary M23C6 ***,mass secondary M23C6 carbides formed and coarsened along grain *** undesirable intermetallic phases formed during the whole *** M2X and interdendritic M23C6 improved the strength of the weld metal after PWHT,but the elongation and impact toughness degraded,which were mainly owing to the intergranular M23C6 carbides that changed the fracture mode from ductile transgranular mode to mixed mode of transgranular and intergranular ***,the coarsening of M2X carbonitrides may lead to the elongation loss during 8 h to 12 *** of impact toughness was also related to the M2X carbonitrides,which made the crack easier to propagate compared with austenitic matrix and contributed to the decline of impact ***,due to the sluggish precipitation of M2X carbonitrides with longer holding time,the decreasing trend became slow from 4 to 12 *** results showed that PWHT should be controlled within 8 h to obtain better combination of strength and ductility.

关键词： Superaustenitic stainless steel Weld metal Post-weld heat treatment Precipitate evolution Mechanical properties

Effects of Stabilization Heat Treatment on Microstructure and Mechanical Properties of Si‑Bearing 15Cr–9Ni–Nb Austenitic Stainless Steel Weld Metal

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Acta Metallurgica Sinica(English Letters) 2023年第4期36卷 637-649页

作者： Yakui Chen Dong Wu 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 CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

Two 15Cr–9Ni–Nb austenitic stainless steel weld metals with 2.5%Si and 3.5%Si(namely 2.5Si and 3.5Si samples,respectively)were designed and prepared through tungsten inert gas(TIG)welding and then hold at 800℃ or 900℃ for 3 h for *** microstructure and mechanical properties were investigated both for the as-welded and after-stabilization heat treatment(SHT)weld *** are 3.0–4.0%martensite and 2.5–3.5%δferrite in the 2.5Si as-welded weld metal and 6.0–7.0%δferrite in the 3.5Si as-welded weld *** SHT,a large amount of martensite formed in the 2.5Si weld metal,andδ→γtransition occurred during the SHT process both for the 2.5Si and 3.5Si weld *** were a large amount of coarse NbC and few nanoscale NbC in the as-welded weld *** the SHT,a large amount of nanoscale NbC formed in the matrix,while a large number of G phases formed at the austenite grain boundaries and theδ/γ*** decrease in solid solution C andδferrite content led to the decline of the yield strength of the weld metal after *** martensite formed in 2.5Si weld metal after SHT had less effect on strength because of its low carbon *** G phases formed during the SHT reduced the impact energy of the weld metal because it promoted the intergranular fracture,while theδ→γtransition reduced the amount of theδ/γinterfaces and avoided the intergranular fracture,which was beneficial for the impact toughness of the weld metals.

关键词： Austenitic stainless steel Weld metal Stabilization heat treatment Martensite NbC δ→γtransition

Spatial evolution and spatial production of traditional villages from "backward poverty villages" to "ecologically well-off villages": Experiences from the hinterland of national nature reserves in China

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Journal of Mountain Science 2024年第4期21卷 1100-1118页

作者： Zhang yiyi li Yangbing College of Geography and Environmental Sciences Guizhou Normal UniversityGuiyang 550001China

With the rapid urbanization process,the space of traditional villages in China is undergoing significant *** the spatial evolution of traditional villages is significant in promoting rural spatial transformation and realizing rural revitalization and sustainable rural *** on the traceability analysis of spatial production theory,this paper constructed an analytical framework for the spatial production evolution of traditional villages,analyzed the spatial evolution process and characteristics of traditional villages by using buffer analysis,spatial syntax,and other research methods,and revealed the characteristics of the spatial production evolution of traditional villages and the driving *** results show that:(1)The village spatial formation and development follow the village life cycle theory and usually develop from embryonic villages to diversified and integrated villages;(2)The evolution of village spatial production is characterized by the diversity of material space,the sublimation of daily life space,and the integration of social system space and generalization of emotional space;(3)The evolution of village spatial production from backward and poor village to ecologically well-off village is influenced by a combination of factors;(4)The village has formed a spatial structure of"people-land-scape-culture-industry",realized comprehensive reconstruction and spatial *** study results reflect the spatial evolution characteristics of traditional villages in mountainous areas in a more comprehensive way,which helps to promote the protection and development of traditional villages in mountainous areas and,to a certain extent,provides a reference for the development of rural revitalization.

关键词： Traditional villages Spatial production Spatial evolution Spatial reconstruction