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FeCrBSiWNb喷涂层的钨极氩弧摆动重熔处理 被引量:3
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作者 蹤雪梅 李稳 +2 位作者 王井 员霄 朱青海 《表面技术》 EI CAS CSCD 北大核心 2017年第7期195-200,共6页
目的设计一种新型的FeCrBSiWNb高速电弧喷涂涂层的钨极氩弧摆动重熔工艺,解决传统钨极氩弧无摆动重熔层单道宽度窄且不均匀、多道搭接处易出现气孔及裂纹等问题。方法通过几何分析和计算设计摆动重熔工艺,并制备FeCrBSiWNb重熔层,利用XR... 目的设计一种新型的FeCrBSiWNb高速电弧喷涂涂层的钨极氩弧摆动重熔工艺,解决传统钨极氩弧无摆动重熔层单道宽度窄且不均匀、多道搭接处易出现气孔及裂纹等问题。方法通过几何分析和计算设计摆动重熔工艺,并制备FeCrBSiWNb重熔层,利用XRD衍射仪、光学显微镜、扫描电镜对摆动重熔层的相结构、显微组织进行表征,用显微硬度仪对其纵截面的显微硬度进行测量。结果设计的钨极氩弧摆动重熔工艺参数:电流53~55A,钨极移动在X方向移动速度65~68mm/min,Y方向移动速度485~500mm/min。摆动重熔层内部无裂纹且单道宽度增大,FeCrBSiWNb重熔层的基体组织由马氏体、残余奥氏体、Fe-Cr固溶体组成,硬质相由硼化物及拉弗斯相组成,重熔层存在固溶强化、析出强化等多种强化方式。重熔层、热影响区、母材的显微硬度分别是820HV0.3、563HV0.3、242HV0.3。结论所设计的新型摆动重熔工艺增大了单道重熔层宽度,进而有效解决了重熔层内部残余应力大易导致裂纹产生的问题。 展开更多
关键词 高速电弧喷涂 FeCrBSiWNb涂层 钨极氩弧重熔 几何分析 裂纹 摆动重熔 拉弗斯
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Similarity Reductions of Nearly Concentric KdV Equation
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作者 WANG Jia LI Biao 《Communications in Theoretical Physics》 SCIE CAS CSCD 2009年第6期1083-1090,共8页
Basing on the direct method developed by Clarkson and Kruskal, the nearly concentric Korteweg-de Vries (ncKdV) equation can be reduced to three types of (1+1)-dimensional variable coefficients partial differentia... Basing on the direct method developed by Clarkson and Kruskal, the nearly concentric Korteweg-de Vries (ncKdV) equation can be reduced to three types of (1+1)-dimensional variable coefficients partial differential equations (PDEs) and three types of variable coefficients ordinary differential equation. Furthermore, three types of (1+1)-dimensional variable coefficients PDEs are all reduced to constant coefficients PDEs by some transformations. 展开更多
关键词 nearly concentric KdV equation CK direct method similarity reductions
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The Vietnam War in the New Century: The Evolution of Apocalypse Now Redux (2001) in Narrative Perspective
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作者 SHAO Bing-qing LIU Xiao 《Journal of Literature and Art Studies》 2015年第2期100-106,共7页
Apocalypse Now is a 1979 American epic war film set during the Vietnam War, directed and produced by Francis Ford Coppola. It was originally adapted from the novella Heart of Darkness (1902), which was written in th... Apocalypse Now is a 1979 American epic war film set during the Vietnam War, directed and produced by Francis Ford Coppola. It was originally adapted from the novella Heart of Darkness (1902), which was written in the colonial era. Apocalypse Now Redux (2001) is a refined version of the 1979 edition. In previous researches, most scholars only focused on either of the two adapted versions in terms of thematic discussion and narrative analysis, which have ignored the significance of the evolution of the film and the changing historical contexts. Accordingly, on the basis of narrative theory and cultural study, the thesis makes a narrative analysis of the evolution of Apocalypse Now Redux (2001). It indicates that through some newly-inserted narrative elements in Apocalypse Now Redux (2001), more attention is paid to minority groups, darkness in war and media quagmire, which is related to different historical and political contexts and endeavors to remind the American public of the harsh lesson of Vietnam War in the 20th century. However, efforts to restraint the war seem to be ineffective, which is fully exemplified by Iraq War in 2003 展开更多
关键词 Apocalypse Now Redux (2001) Vietnam War narrative theory new century
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动物园桥牌故事——是否要迟疑
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作者 王止戈 《桥牌》 2023年第11期60-63,共4页
晚餐吃过了。63年德拉弗斯的酒瓶在桌上转来转去,主要是围绕着公猪兜圈子。“一切关于牌德的所谓研究啊,纯粹是瞎耽误功夫。”公猪说道。他刚刚被魔鬼分委员会叫去提供证言了,他念不平的原因就是这浪费了他打二又四分之一局牌的时间。
关键词 拉弗斯 公猪 动物园
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《吉尼斯大全》 与世界之最
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作者 孙福秋 《世界博览》 1992年第3期8-9,共2页
几年来,南梯斯公园的雇员安德烈·格里一直在精心护理他的大丽花,为之倾注了大量心血。回报终于来了——他以培育出世界上最饱满、最高大(5.1米)的大丽花而进入1991年版的《吉尼斯大全》。格里先生现在与第一个在月球上行走的内尔&#... 几年来,南梯斯公园的雇员安德烈·格里一直在精心护理他的大丽花,为之倾注了大量心血。回报终于来了——他以培育出世界上最饱满、最高大(5.1米)的大丽花而进入1991年版的《吉尼斯大全》。格里先生现在与第一个在月球上行走的内尔·艾登·阿姆斯特朗和苹果王——在一个苹果上削下57.27米的果皮的莫里斯·达拉弗斯一样,在这一标志世界新纪录的宝库中占据了一席之地。吉尼斯无所不包。 展开更多
关键词 拉弗斯 安德烈 艾登 世界纪录 内尔 世界博览 世界之最 阿姆斯特朗 法兰 唐纳德
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