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含双边轴向裂纹N18锆合金薄壁管的蠕变裂纹扩展行为研究 被引量:1
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作者 李志浩 包陈 +1 位作者 王博 刘晓坤 《核动力工程》 EI CAS CSCD 北大核心 2020年第5期53-59,共7页
通过对含双边轴向裂纹管(DEAT)试样及其加载装置进行设计,基于能量等效和载荷分离原理获得了DEAT试样的能量率回路积分(C^*积分)表达式,从而建立了含轴向裂纹薄壁管的蠕变裂纹扩展速率测试方法。基于此方法,采用DEAT试样完成了N18锆合... 通过对含双边轴向裂纹管(DEAT)试样及其加载装置进行设计,基于能量等效和载荷分离原理获得了DEAT试样的能量率回路积分(C^*积分)表达式,从而建立了含轴向裂纹薄壁管的蠕变裂纹扩展速率测试方法。基于此方法,采用DEAT试样完成了N18锆合金薄壁管在350℃不同载荷水平下的蠕变裂纹扩展试验。结果表明,蠕变载荷会显著影响N18锆合金的蠕变裂纹扩展速率;蠕变裂纹扩展可分为稳态扩展和快速扩展2个阶段;蠕变裂纹扩展速率(da/dt)与C^*积分存在良好的幂律关系,可用于预测N18锆合金管蠕变裂纹扩展行为。 展开更多
关键词 含双边轴向裂纹管(DEAT) N18锆合金薄壁管 蠕变裂纹扩展 C^*积分
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Synthesis of Large-Area, Few-Layer Graphene on Iron Foil by Chemical Vapor Deposition 被引量:8
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作者 Yunzhou Xue Bin Wu Yunlong Guo Liping Huang Lang Jiang Jianyi Chen Dechao Geng Yunqi Liu Wenping Hu Gui Yu 《Nano Research》 SCIE EI CAS CSCD 2011年第12期1208-1214,共7页
We demonstrate a simple and controllable way to synthesize large-area, few-layer graphene on iron substrates by an optimized chemical vapor deposition (CVD) method using a mixture of methane and hydrogen. Based on a... We demonstrate a simple and controllable way to synthesize large-area, few-layer graphene on iron substrates by an optimized chemical vapor deposition (CVD) method using a mixture of methane and hydrogen. Based on an analysis of the Fe-C phase diagram, a suitable procedure for the successful synthesis of graphene on Fe surfaces was designed. An appropriate temperature and cooling process were found to be very important in the synthesis of highly crystalline few-layer graphene. Graphene-based field-effect transistor (FET) devices were fabricated using the resulting few-layer graphene, and showed good quality with extracted mobilities of 300-1150 cm2/(V.s). 展开更多
关键词 GRAPHENE iron foil chemical vapor deposition (CVD) method Raman spectroscopy field-effect transistor (FET)
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A Class of Oscillatory Singular Integrals
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作者 勒孚龙 胡国恩 《Journal of Mathematical Research and Exposition》 CSCD 1999年第1期18-24,共7页
LP mapping properties are considered for a class of oscillatory signular integral operators.Ketwords:Calderon-Zygmund kernel. oscillatory singular integral operator. polynomial growth estimate.
关键词 Calder n-Zyhmund kernel oscillatory singular integral operator polynomial growth estimate
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