Electromagnetic railgun attracts more and more attention due to its advantage in speed,cost,and obscurity.It is found that the rail should withstand huge mechanical and thermal shocks during the launching operation.Th...Electromagnetic railgun attracts more and more attention due to its advantage in speed,cost,and obscurity.It is found that the rail should withstand huge mechanical and thermal shocks during the launching operation.The forms of rail failure are accompanied by gouge,grooving,transition,and arc ablation,etc.The service life of the rail has become a bottleneck restricting the development of electromagnetic railgun technology.A series of researches are carried out to solve rail failure,including analysing the failure mechanism and using various advanced rail materials.This paper provides a comprehensive review of rail materials,including material composition,preparation,microstructure,and properties.We begin from a short background of the requirement of the rail material.Then a detailed investigation of rail materials is described,and the performances of those materials are introduced.Finally,further development prospect of rail material is discussed.展开更多
目的探讨维甲酸诱导蛋白14(retinoic acid induced protein 14,RAI14)在胃腺癌组织中的表达及其与临床病理特征的关系。方法收集58例胃浸润性腺癌,采用免疫组化EliVision两步法检测RAI14蛋白表达,并分析其表达与临床病理特征的关系,并与...目的探讨维甲酸诱导蛋白14(retinoic acid induced protein 14,RAI14)在胃腺癌组织中的表达及其与临床病理特征的关系。方法收集58例胃浸润性腺癌,采用免疫组化EliVision两步法检测RAI14蛋白表达,并分析其表达与临床病理特征的关系,并与TCGA数据库样本分析结果进行比较。结果胃浸润性腺癌中RAI14高表达率为58.6%,与周围正常胃黏膜相比差异有显著性,所得结果与TCGA数据库样本分析结果一致;RAI14在肿瘤>5 cm、低分化、有脉管侵犯、有淋巴结转移以及高分期病例中阳性率较高,分别为82.6%、81.2%、72.5%、72.2%、68.2%,差异有统计学意义(P<0.05);与患者年龄、性别及神经侵犯并无相关性。结论RAI14蛋白在胃腺癌中高表达,RAI14的高表达与肿瘤侵袭性相关临床病理特征有相关性,RAI14有望成为胃癌治疗的潜在靶点。展开更多
基金This work is supported by the National Key R&D Program of China(No.2017YFB1200800)the National Natural Science Foundation of China(No.11725210,11572281,51827810,51637009)+1 种基金the Fundamental Research Funds for the Central Universities(2018XZZX001-05)the National Student’s Platform for Innovation and Entrepreneurship Training Program(201910335115).
文摘Electromagnetic railgun attracts more and more attention due to its advantage in speed,cost,and obscurity.It is found that the rail should withstand huge mechanical and thermal shocks during the launching operation.The forms of rail failure are accompanied by gouge,grooving,transition,and arc ablation,etc.The service life of the rail has become a bottleneck restricting the development of electromagnetic railgun technology.A series of researches are carried out to solve rail failure,including analysing the failure mechanism and using various advanced rail materials.This paper provides a comprehensive review of rail materials,including material composition,preparation,microstructure,and properties.We begin from a short background of the requirement of the rail material.Then a detailed investigation of rail materials is described,and the performances of those materials are introduced.Finally,further development prospect of rail material is discussed.
