检索结果-南通市图书馆

Acta Metallurgica Sinica(English Letters) 2024年第5期37卷 793-807页

作者： Jinpeng Hu Tao Sun Fujun Cao yifu shen Zhiyuan Yang Chan Guo College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics(NUAA)Nanjing 210016China

Submerged friction stir processing(SFSP)with flowing water was employed to alleviate the porosities and coarse-grained structure introduced by wire-arc *** a result,uniform and ultrafine grained(UFG)structure with average grain size of 0.83μm was achieved with the help of sharply reduced heat input and holding time at elevated *** optimized UFG structure enabled a superior combination of strength and ductility with high ultimate tensile strength and elongation of 273.17 MPa and 15.39%.Specifically,grain refinement strengthening and decentralized θ(Al_(2)Cu)phase in the sample subjected to SFSP made great contributions to the enhanced *** addition,the decrease in residual stresses and removal of pores substantially enhance the *** rates of cooling and low temperature cycling,which are facilitated by the water-cooling environment throughout the machining process,are vital in obtaining superior *** work provides a new method for developing a uniform and UFG structure with excellent mechanical properties.

关键词： Submerged friction stir processing Wire-arc additive manufacturing Al-Cu alloy Residual stress Strengthening and toughening mechanism Ultrafine grained microstructure

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

基于数字孪生的热处理智能化技术研究进展

南京航空航天大学学报 2024年第3期56卷 375-386页

作者：沈以赴胡涨泉周益民李发亮南京航空航天大学材料科学与技术学院南京211106 盐城工学院机械工程学院集优学院盐城224007 盐城辉途科技有限公司盐城224005

为减少热处理智能化技术数据孤岛的状态,数字孪生的运用被广泛关注。数字孪生技术是智能化制造领域的先进智能技术,也是解决数据孤岛的重要方法之一。本文介绍了数字孪生技术与基于数字孪生的热处理研究现状。以车间数字孪生框架为基础... 详细信息

为减少热处理智能化技术数据孤岛的状态,数字孪生的运用被广泛关注。数字孪生技术是智能化制造领域的先进智能技术,也是解决数据孤岛的重要方法之一。本文介绍了数字孪生技术与基于数字孪生的热处理研究现状。以车间数字孪生框架为基础,从物理车间、虚拟车间、车间服务系统、孪生数据4个方面介绍数字孪生的研究现状,分析了各部分中存在的主要问题。针对基于数字孪生为基础的热处理技术,结合传统热处理技术与特殊热处理的智能化研究进展,分析数字孪生技术在热处理中的应用与进展。

关键词：热处理数字孪生智能制造车间控制技术

稀土元素对桥梁缆索用热浸镀Zn-10Al镀层钢丝耐蚀性能的影响

在线全文

学校读者我要写书评

暂无评论

当代化工研究 2024年第5期 1-3页

作者：葛云鹏朱晓雄沈以赴南京航空航天大学材料科学与技术学院江苏210017 江苏东纲金属制品有限公司江苏214400

通过双镀法制备Zn-10Al-xRE(x=0.05,0.08,0.11,0.14,0.17)五种热浸镀锌铝镀层,并利用中性加速盐雾试验、电化学实验及扫描电子显微镜(SEM)分析其腐蚀形貌及耐蚀性能。结果表明,五种镀层在中性加速盐雾试验下,可保证基体在120d以内不被腐... 详细信息

通过双镀法制备Zn-10Al-xRE(x=0.05,0.08,0.11,0.14,0.17)五种热浸镀锌铝镀层,并利用中性加速盐雾试验、电化学实验及扫描电子显微镜(SEM)分析其腐蚀形貌及耐蚀性能。结果表明,五种镀层在中性加速盐雾试验下,可保证基体在120d以内不被腐蚀,而纯锌镀层在30d时已经出现红锈,证明Zn-10Al-xRE的耐蚀性能可达到纯锌镀层4~5倍。Zn-10Al-xRE镀层钢丝的耐蚀性能随稀土含量的上升先升高再降低,添加0.08%RE的Zn-10Al镀层耐蚀性最好。用SEM对120d盐雾试验下的镀层钢丝进行观察,可以看出纯锌镀层的腐蚀产物较为疏松,Zn-10Al-xRE的腐蚀产物较为致密,Zn-10Al-xRE中腐蚀产物大约分为韧窝状、球状及针片状,耐蚀性能最好的Zn-10Al-0.08RE镀层中含有大量韧窝状腐蚀产物。

关键词：热浸镀锌铝镀层稀土耐蚀性能

在线全文

学校读者我要写书评

暂无评论

不锈钢波纹膜片激光焊接的组织和性能研究

焊接技术 2024年第7期53卷 38-42页

作者：季文杰沈以赴周光夏宏营南京航空航天大学江苏南京210000 南京晨光集团有限责任公司江苏南京210000

对SUS304奥氏体不锈钢波纹膜片进行激光焊接工艺试验,基于Minitab软件,分析工艺试验结果,筛选最佳工艺参数。结果表明:基值功率120 W、峰值功率500 W、离焦量+4 mm、焊接速度1050 mm∕min时,可获得成形良好的焊缝。接头显微组织表明:焊... 详细信息

对SUS304奥氏体不锈钢波纹膜片进行激光焊接工艺试验,基于Minitab软件,分析工艺试验结果,筛选最佳工艺参数。结果表明:基值功率120 W、峰值功率500 W、离焦量+4 mm、焊接速度1050 mm∕min时,可获得成形良好的焊缝。接头显微组织表明:焊接热影响区较窄,主要为轧制状的奥氏体组织,但其组织相比母材区有所增大;焊缝中心区主要为细的等轴晶粒,边缘处主要为垂直于熔合线的柱状晶粒。力学性能测试结果表明:接头断裂于热影响区,其最大抗拉强度为493 MPa,达到母材抗拉强度的82%;接头主要呈现韧窝断裂特征,断口同时存在等轴和剪切韧窝。

关键词：波纹膜片激光焊显微组织力学性能

Preparation and Microwave Absorption Property of Sr_2FeMoO_6 Powder

在线全文

学校读者我要写书评

暂无评论

Transactions of Nanjing University of Aeronautics and Astronautics 2017年第2期34卷 205-210页

作者： Feng Xiaomei Chen Jiankun shen yifu College of Materials Science and Technology Nanjing University of Aeronautics and Astronauticsnanjing 211106china

Double perovskite oxide Sr_2FeMoO_6 powder is prepared by a solid state reaction *** microwave absorption properties of Sr_2FeMoO_6 and paraffin wax composites are studied in the frequency range of 2—18GHz at room *** optimum absorption-36.7dB is achieved at 17.7GHz with a matching thickness of 5.0mm,which indicates that Sr_2FeMoO_6/paraffin composites can be potential microwave absorbers in a relatively high frequency *** excellent microwave absorption properties are attributed to the good electromagnetic match between dielectric loss and magnetic *** dielectric loss is considered to be caused by orientation polarization and interfacial polarization,while the magnetic loss is caused by natural resonance in the low frequency range,eddy current loss as well as exchange resonance in the high frequency range.

关键词： double perovskite solid state reaction microwave absorption property

A perspective to ammonia-hydrogen energy industry in China

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第6期67卷 1765-1775页

作者： Baoshun Zhang Wangyang Ji Jiewei Zhu Baian shen Menghao Lv Bin Zhang Tihu Wang yifu Yu Department of Chemistry Institute of Molecular PlusSchool of ScienceTianjin UniversityTianjin300072China Tianjin University-Asia Silicon Joint Research Center of Ammonia-Hydrogen New Energy Asia Silicon(Qinghai)Co.Ltd.Xining810007China Department of Catalysis Science and Engineering School of Chemical Engineering and TechnologyTianjin UniversityTianjin300072China

1 *** meet the 1.5℃ climate goal in our planet,the world is making a hard work for decarbonization[1-5].Constructing a clean energy system based on green energy is considered as the most promising way to achieve the ... 详细信息

关键词： ammonia planet energy

同方期刊数据库

Cyclin L1 controls cardiomyocyte proliferation and heart repair after injury

在线全文

学校读者我要写书评

暂无评论

Signal Transduction and Targeted Therapy 2023年第7期8卷 3236-3239页

作者： Rui Gong Xinlu Gao Yu Liu yifu shen Zuke Jiang Xiuxiu Wang Naufal Zagidullin Wenya Ma Ning Wang Benzhi Cai Department of Pharmacy at The Second Affiliated Hospital and Department of Pharmacology at College of Pharmacy(The Key Laboratory of Cardiovascular Medicine ResearchMinistry of Education)Harbin Medical University150081 HarbinChina Department of Laboratory Medicine at The Fourth Affiliated Hospital Harbin Medical University150086 HarbinChina Department of Internal Diseases Bashkir State Medical UniversityUfa 450008Russia

Dear Editor,Myocardial infarction(MI)is characterized by the loss of functional cardiomyocyte(CM)in the heart,resulting in cardiac systolic dysfunction and heart failure.1,2 Increasing evidence suggested that in the heart of neonatal mice after apical resection(AR),the CM can proliferate and regenerate myocardium to repair the *** in the heart of adult mice after MI,the CM loses the ability to re-enter the cell cycle but undergoes hypertrophic growth.

关键词： cardio cardiac neonatal

搅拌摩擦加工制备FeCoNiCrMn高熵合金增强铝基复合材料的组织与力学性能研究

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Transactions of Nanjing University of Aeronautics and Astronautics 2023年第1期40卷 98-105页

作者：江剑沈以赴南京航空航天大学材料科学与技术学院中国南京211106

采用多道搅拌摩擦加工(Friction stir processing,FSP)工艺将高熵合金(High entropy alloy,HEA)颗粒分散到2024铝合金基体中,制备了HEA/Al复合材料。研究了搅拌摩擦加工道次对复合材料宏观形貌、微观结构和力学性能的影响。显微组织观... 详细信息

采用多道搅拌摩擦加工(Friction stir processing,FSP)工艺将高熵合金(High entropy alloy,HEA)颗粒分散到2024铝合金基体中,制备了HEA/Al复合材料。研究了搅拌摩擦加工道次对复合材料宏观形貌、微观结构和力学性能的影响。显微组织观察表明,增加搅拌摩擦加工道次有助于高熵合金颗粒的均匀分布和晶粒细化。力学性能测试结果表明,随着搅拌摩擦加工道次的增加,搅拌摩擦加工制备复合材料的显微硬度值显著提高,分布更加均匀,强度和塑性也有所提高。五道次搅拌摩擦加工所制备复合材料的显微硬度、强度和塑性分别达到138 HV、597 MPa和5.1%。

关键词：搅拌摩擦加工铝基复合材料高熵合金显微组织机械性能

SURFACE MODIFICATION ON STEEL BY RARE EARTH AND LASER TREATMENT

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 1997年第4期7卷 77-80页

作者： shen, yifu Feng, Zhongchao Chen, Jizhi Liang, Yong Inst of Metal research Chinese Acad of Sciences Shenyang China

ＳＵＲＦＡＣＥＭＯＤＩＦＩＣＡＴＩＯＮＯＮＳＴＥＥＬＢＹＲＡＲＥＥＡＲＴＨＡＮＤＬＡＳＥＲＴＲＥＡＴＭＥＮＴ①ＳｈｅｎＹｉｆｕ１，２，ＦｅｎｇＺｈｏｎｇｃｈａｏ１，ＣｈｅｎＪｉｚｈｉ１，ＬｉａｎｇＹｏｎｇ１１Ｉｎｓｔ... 详细信息

ＳＵＲＦＡＣＥＭＯＤＩＦＩＣＡＴＩＯＮＯＮＳＴＥＥＬＢＹＲＡＲＥＥＡＲＴＨＡＮＤＬＡＳＥＲＴＲＥＡＴＭＥＮＴ①ＳｈｅｎＹｉｆｕ１，２，ＦｅｎｇＺｈｏｎｇｃｈａｏ１，ＣｈｅｎＪｉｚｈｉ１，ＬｉａｎｇＹｏｎｇ１１ＩｎｓｔｉｔｕｔｅｏｆＭｅｔａｌＲｅｓｅａ...

关键词： rare earth laser treatment surface modification

Targeted G-to-T base editing for generation of novel herbicide-resistance gene alleles in rice

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2024年第6期66卷 1048-1051页

作者： yifu Tian Xinbo Li Jiyong Xie Zai Zheng Rundong shen Xuesong Cao Mugui Wang Chao Dong Jian-Kang Zhu Ministry of Agriculture and Rural Affairs Key Laboratory of Gene Editing Technologies(Hainan) Institute of Crop Sciences and National Nanfan Research InstituteChinese Academy of Agricultural SciencesSanya 572024China Hainan Seed Industry Laboratory Sanya 572024China Shanghai Center for Plant Stress Biology CAS Center for Excellence in Molecular Plant SciencesThe Chinese Academy of SciencesShanghai 201602China University of Chinese Academy of Sciences Beijing 100049China Institute of Advanced Biotechnology and School of MedicineSouthern University of Science and TechnologyShenzhen 518055China

Deaminase-based cytosine base editors(CBEs)and adenine base editors(ABEs)induce C-to-T and A-to-G transitions,respectively,enabling single-nucleotide variants(SNVs)in plants for research and crop enhancement(Li et al.,2023a).The C-to-G base editors(CGBEs)and A-to-Y base editors(AYBEs),developed by incorporating glycosylases with CBEs and ABEs,expand the repertoire of base editing products,allowing C-to-T/G and A-to-T/G transversions in plants(Li et al.,2023b,2023c;Sretenovic et a.,2021).

关键词： base alleles CBE