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Enhanced low cycle fatigue properties of selective laser melting Ti-6Al-4V with fine-tuned composition and optimized microstructure

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Journal of Materials Science & Technology 2024年第13期180卷 129-140页

作者： Yuqi He Fengying Zhang yuhong Dai Kexin Zhao Zimeng Ye Zerong Yu Chao Xia Hua Tan School of Material Science and Engineering Chang'an UniversityXi'an 710064China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072China School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou 510641China

Improving the low-cycle fatigue(LCF)properties of additively manufactured Ti-5.6Al-3.8V alloy is critical in ensuring its service safety and represents a significant research *** work discusses a so-lution that optimizes the alloy's microstructure and ductility by precisely controlling the over-saturated strengthening elements and heat *** was accomplished using selective laser melting(SLM),heat treatment at 800 ℃ for 2 h,and furnace cooling on a Ti-5.6Al-3.8V alloy with tightly controlled Al,V,and O concentrations in a lower *** results showed that the SLM-fabricated Ti-5.6Al-3.8V alloy,post-heat treatment,exhibited α laths with a width of~1.4 μm and β columnar grains with a diameter of~126 μm,without experiencing coarsening or variant selection *** alloy bal-anced strength and ductility post-heat treatment with a UTS of 1015 MPa and an EL of 16.5%relative to the as-deposited state(UTS of 1199 MPa and EL of 11.9%).Notably,the LCF properties of the heat-treated SLM Ti-5.6Al-3.8V alloy are superior to those of other Ti-6Al-4V alloys produced by additive manu-facturing and comparable to traditional *** high strain amplitudes(1-1.5%),the fatigue life of this alloy was twice that of the Ti-6Al-4V ***,we comprehensively analyzed the mi-crostructure,strength,and ductility of the SLM Ti-5.6Al-3.8V alloy to elucidate the factors influencing its LCF *** findings provide a solid foundation for improving the LCF properties of additively manufactured Ti-6Al-4V alloy,thereby contributing to its safe and reliable use in critical applications.

关键词： Additive manufacturing Selective laser melting Titanium alloy Low cycle fatigue microstructure

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郧县乔家院墓地东周～汉代居民牙齿的形态观察与测量

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江汉考古 2010年第3期 106-112页

作者：周蜜黄玉洪湖北省文物考古研究所湖北武汉430077

本文运用牙齿人类学的研究方法,对出土于湖北郧县乔家院墓地东周至汉代居民的牙齿形态进行了研究。提供了人们对牙齿形态特征的认识,丰富了我国古代居民牙齿各个项目的测量数据,积累了现代人类微观演化的证据。

关键词：郧县乔家院墓地牙齿形态特征

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非均匀载荷作用下套管挤压失效数值分析

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石油机械 1999年第7期27卷 34-37页

作者：房军谷玉洪米丰珍华东石油大学江汉石油管理局石油机械厂济南三爱富公司

在已有的理论研究与试验工作的基础上，采用有限元数值方法，分析计算了受非均匀地应力作用下套管－水泥环结构的受力与变形，讨论了两个敏感参数─—非均匀载荷比和套管椭圆度对套管失效的影响问题。计算分析发现，随地应力非均匀程度... 详细信息

在已有的理论研究与试验工作的基础上，采用有限元数值方法，分析计算了受非均匀地应力作用下套管－水泥环结构的受力与变形，讨论了两个敏感参数─—非均匀载荷比和套管椭圆度对套管失效的影响问题。计算分析发现，随地应力非均匀程度的增加，套管形变经历了由两向挤压－挤压到两向拉伸－挤压组合方式的转变，而套管应力的变化相对较小。由此可得出初步结论：与非均匀地应力作用相对应的套管结构的拉伸－挤压形变，有可能是导致套管失效的主要机制；套管椭圆度的存在使得套管的强度和刚度被进一步的削弱。

关键词：非均匀载荷套管挤压失效数值分析固井

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百合鳞茎营养素与植物化学成分研究进展

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食品工业科技 2024年第14期45卷 1-14页

作者：米璐林玉红廖小军徐贞贞中国农业大学食品科学与营养工程学院北京100083 中国农业科学院农业质量标准与检测技术研究所农业农村部农产品质量安全重点实验室北京100081 甘肃省农业科学院生物技术研究所甘肃兰州730070

百合是多年生草本植物,兼具观赏、食用和药用价值,其可食用或药用部位一般为鳞茎。近年来,百合鳞茎作为一种特色蔬菜,受到消费者青睐。本文重点从不同品种视角对百合鳞茎进行了分析,首先归纳了碳水化合物(包括活性多糖)、蛋白质及氨基... 详细信息

百合是多年生草本植物,兼具观赏、食用和药用价值,其可食用或药用部位一般为鳞茎。近年来,百合鳞茎作为一种特色蔬菜,受到消费者青睐。本文重点从不同品种视角对百合鳞茎进行了分析,首先归纳了碳水化合物(包括活性多糖)、蛋白质及氨基酸、脂类、矿物质和维生素等营养素的详细构成,进一步总结了其甾体皂苷(包括螺甾烷醇、异螺甾烷醇、变形螺甾烷醇、呋甾烷醇类)、酚酸类(包括单聚酚酸、酚酸甘油酯和苷类)、黄酮类(包括黄酮醇、黄烷醇、查尔酮、黄烷酮、黄烷酮醇、花色苷类等)和生物碱类(包括异喹啉、吡咯啉、哌啶和甾体糖苷类)等已知植物化学成分的构成及其生物活性,最后对百合在保健食品中的应用进行概括,以期为百合研究及非药用加工利用提供理论依据和研究思路。

关键词：百合百合鳞茎特色蔬菜植物化学成分生物活性功能性食品

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Artificial Bear Bile:A Novel Approach to Balancing Medical Requirements and Animal Welfare

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Engineering 2024年第7期38卷 100-112页

作者： Yong Li yuhong Huang Nan Feng Heping Zhang Jing Qu Shuanggang Ma Yunbao Liu Jiang Li Shaofeng Xu Ling Wang mi Zhang Jie Cai Weiping Wang Ru Feng Hang Yu Bo Yu Dailiang Liang Heping Qin Suxiang Luo Yanfen Li Meifeng Li Ruihua Wang Chen Ma Yan Wang Xiaobo Cen Xiaoxian Xu Boli Zhang Xiaoliang Wang Shishan Yu State Key Laboratory of Bioactive Substance and Function of Natural Medicines Institute of Materia MedicaChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100050China The Second Affiliated Hospital of Tianjin University of Traditional Chinese Medicine Tianjin 300250China Zhongshan Belling Biotechnology Co. Ltd.Zhongshan 528437China Zhongshan Anshi Biopharmaceutical Co. Ltd.Zhongshan 528437China WestChina-Frontier Pharma Tech Co. Ltd.Chengdu 610041China Tianjin University of Traditional Chinese Medicine Tianjin 301617China

Bear bile has been a valuable and effective medicinal material in traditional Chinese medicine(TCM)for over 13 ***,the current practice of obtaining it through bear farming is under scrutiny for its adverse impact on bear ***,we present a new approach for creating artificial bear bile(ABB)as a high-quality and sustainable alternative to natural bear *** study addresses the scientific challenges of creating bear bile alternatives through interdisciplinary collaborations across various fields,including resources,chemistry,biology,medicine,pharmacology,and TCM.A comprehensive efficacy assessment system that bridges the gap between TCM and modern medical terminology has been established,allowing for the systematic screening of therapeutic *** the utilization of chemical synthesis and enzyme engineering technologies,our research has achieved the environmentally friendly,large-scale production of bear bile therapeutic compounds,as well as the optimization and recomposition of ABB *** resulting ABB not only closely resembles natural bear bile in its composition but also offers advantages such as consistent product quality,availability of raw materials,and independence from threatened or wild *** preclinical efficacy evaluations have demonstrated the equivalence of the therapeutic effects from ABB and those from commercially available drained bear bile(DBB).Furthermore,preclinical toxicological assessment and phase I clinical trials show that the safety of ABB is on par with that of the currently used *** innovative strategy can serve as a new research paradigm for developing alternatives for other endangered TCMs,thereby strengthening the integrity and sustainability of TCM.

关键词： Artificial bear bile Chemical profile Formula optimization Pharmacodynamic consistency Preclinical toxicological assessment

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航空燃料高温裂解条件下热稳定添加剂的研究进展

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化工进展 2006年第6期25卷 595-599页

作者：朱玉红米镇涛张香文天津大学化工学院绿色合成与转化教育部重点实验室天津300072

介绍了供氢剂和结焦抑制剂两类热稳定剂抑制航空燃料高温(>400℃)热裂解期结焦的研究进展。评述了一元、二元供氢剂以及含磷、有机硒、含硫结焦抑制剂的抑焦机理及其抑焦效果,并提出今后的研究方向。

关键词：航空燃料焦炭供氢剂结焦抑制剂热稳定剂

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Molecularly tagged genes and quantitative trait loci in cucumber with recommendations for QTL nomenclature

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Horticulture Research 2020年第1期7卷 2678-2697页

作者： Yuhui Wang Kailiang Bo Xingfang Gu Junsong Pan yuhong Li Jinfeng Chen Changlong Wen Zhonghai Ren Huazhong Ren Xuehao Chen Rebecca Grumet Yiqun Weng Department of Horticulture University of WisconsinMadisonWI 53706USA Institute of Vegetables and Flowers Chinese Academy of Agricultural SciencesBeijing 100081China Department of Plant Sciences Shanghai Jiaotong UniversityShanghai 200240China Horticulture College Northwest A&F UniversityYangling 712100China Horticulture College Nanjing Agricultural UniversityNanjing 210095China Beijing Vegetable Research Center Beijing Academy of Agricultural and Forestry SciencesBeijing 100097China College of Horticulture Science and Engineering Shandong Agricultural UniversityTai’an 271018China College of Horticulture China Agricultural UniversityBeijing 100193China College of Horticulture and Plant Protection Yangzhou UniversityYangzhou 225009China Department of Horticulture Michigan State UniversityEast LansingMI 48824USA USDAARS Vegetable Crops Research Unit 1575 Linden Dr.MadisonWI 53706USA

Cucumber,Cucumis sativus L.(2n=2x=14),is an important vegetable crop *** was the first specialty crop with a publicly available draft *** relatively small,diploid genome,short life cycle,and selfcompatible mating system offers advantages for genetic *** recent years,significant progress has been made in molecular mapping,and identification of genes and QTL responsible for key phenotypic traits,but a systematic review of the work is ***,we conducted an extensive literature review on mutants,genes and QTL that have been molecularly mapped or characterized in *** documented 81 simply inherited trait genes or major-effect QTL that have been cloned or fine *** each gene,detailed information was compiled including chromosome locations,allelic variants and associated polymorphisms,predicted functions,and diagnostic markers that could be used for marker-assisted selection in cucumber *** also documented 322 QTL for 42 quantitative traits,including 109 for disease resistances against seven *** alignment of these QTL on the latest version of cucumber draft genomes,consensus QTL across multiple studies were inferred,which provided insights into heritable correlations among different *** collaborative efforts among public and private cucumber researchers,we identified 130 quantitative traits and developed a set of recommendations for QTL nomenclature in *** is the first attempt to systematically summarize,analyze and inventory cucumber mutants,cloned or mapped genes and QTL,which should be a useful resource for the cucurbit research community.

关键词： trait traits cucumber

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The root-knot nematode effectormi2G02 hijacks a host plant trihelix transcription factor to promote nematode parasitism

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Plant Communications 2024年第2期5卷 151-168页

作者： Jianlong Zhao Kaiwei Huang Rui Liu Yuqing Lai Pierre Abad Bruno Favery Heng Jian Jian Ling Yan Li yuhong Yang Bingyan Xie michael Quentin Zhenchuan Mao State Key Laboratory of Vegetable Biobreeding Institute of Vegetables and FlowersChinese Academy of Agricultural SciencesBeijing 100081China INRAE Universite´Cote d’AzurCNRSISA06903 Sophia AntipolisFrance Department of Plant Pathology and Key Laboratory of Pest Monitoring and Green Management of the ministry of Agriculture China Agricultural UniversityBeijing 100193China

Root-knot nematodes(RKNs)cause huge agricultural losses every *** secrete a repertoire of effectors to facilitate parasitism through the induction of plant-derived giant feeding cells,which serve as their sole source of ***,the mode of action of these effectors and their targeted host pro-teins remain largely *** this study,we investigated the role of the effector mi2G02 in Meloidogyne incognita ***-derived mi2G02 RNA interference in Arabidopsis thaliana affected giant cell development,whereas ectopic expression of mi2G02 promoted root growth and increased plant sus-ceptibility to *** used various combinations of approaches to study the specific interactions between mi2G02 and *** GT-3a,a trihelix transcription ***-3a knockout in *** affected feeding-site development,resulting in production of fewer egg masses,whereas GT-3a overex-pression in *** increased susceptibility to *** and also root ***,we demon-strated that mi2G02 plays a role in maintaining GT-3a protein stabilization by inhibiting the 26S proteasome-dependent pathway,leading to suppression of TOZ and RAD23C expression and thus promoting nematode *** work enhances our understanding of how a pathogen effector manipulates the role and regulation of a transcription factor by interfering with a proteolysis pathway to reprogram gene expression for development of nematode feeding cells.

关键词： Meloidogyne incognita effector giant cell mi2G02 transcription factor interaction

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内窥扫频光学相干层析探测牙齿根裂的研究

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光学学报 2019年第8期39卷 140-149页

作者：孙伟李嘉男戚苈源朱锐梁宇红米磊中国科学院西安光学精密机械研究所瞬态光学与光子技术国家重点实验室陕西西安710119 中国科学院大学北京100049 北京大学口腔医学院口腔医院牙体牙髓科北京100081 深圳市中科微光医疗器械技术有限公司广东深圳518052 北京大学国际医院口腔科北京102206

根裂诊疗是目前牙科临床医学的难点。搭建三维扫频光学相干层析成像系统,结合心血管内窥成像探头,对46个有根裂(裂缝宽度8~283μm)牙齿切片样本进行扫描成像,该系统对根裂大于30μm的样本的诊断准确率可达98.3%,对根裂小于30μm的诊断... 详细信息

根裂诊疗是目前牙科临床医学的难点。搭建三维扫频光学相干层析成像系统,结合心血管内窥成像探头,对46个有根裂(裂缝宽度8~283μm)牙齿切片样本进行扫描成像,该系统对根裂大于30μm的样本的诊断准确率可达98.3%,对根裂小于30μm的诊断准确率为36.3%;对25个无根裂样本扫描,诊断准确率为92%。分析准确率差异原因,优化内窥导管探头与牙齿切片的相对位置和角度,并对部分图像进行三维重建,使得根裂大于30μm的样本的诊断准确率提高到100%,根裂小于30μm的诊断准确率提高到57.6%。实验表明,内窥光学相干层析技术在牙齿根裂临床诊断中具有良好的应用前景。

关键词：成像系统内窥成像光学相干层析成像内窥导管三维重建

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航空燃料超临界热裂解过程中焦炭的形成

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石油化工 2006年第12期35卷 1151-1155页

作者：朱玉红余彩香李子木米镇涛张香文天津大学化工学院绿色合成与转化教育部重点实验室天津300072

采用连续流动反应装置研究了国产航空燃料RP-3在超临界热裂解条件下焦炭形成的规律和性质,总结了焦炭的形成机理和形成过程。示差扫描量热仪测定结果显示,5MPa下RP-3燃料的起始裂解温度为471.8℃;程序升温氧化和扫描电子显微镜的分析结... 详细信息

采用连续流动反应装置研究了国产航空燃料RP-3在超临界热裂解条件下焦炭形成的规律和性质,总结了焦炭的形成机理和形成过程。示差扫描量热仪测定结果显示,5MPa下RP-3燃料的起始裂解温度为471.8℃;程序升温氧化和扫描电子显微镜的分析结果显示,沉积焦炭中有3种不同的焦炭,分别为富氢吸附碳、无定形碳和纤维焦炭;超临界流体对焦炭前体和沉积的焦炭有较强的萃取及溶解能力,可携带90%以上的焦炭;用X射线能谱分析剥离下来焦炭的结果显示,焦炭中含有质量分数为17.09%和11.12%的铁、铬原子,说明金属发生了渗碳现象;用气相色谱-质谱联用仪对RP-3燃料及其裂解液的分析结果显示,裂解液中烷基苯和烷基萘含量的增加最为显著。

关键词：焦炭航空燃料热裂解超临界萃取

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