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激光处理对3D打印聚醚酰亚胺, 聚醚醚酮和聚醚醚酮/碳纤维制件胶接性能的影响 被引量:6
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作者 李卫杰 张伟 +5 位作者 李元成 桑琳 秦凤鸣 李楠 王锦艳 蹇锡高 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2021年第12期75-82,共8页
采用激光技术对3D打印机制备的聚醚酰亚胺(PEI)、聚醚醚酮(PEEK)和聚醚醚酮/碳纤维(PEEK/CF)制件表面进行处理,研究了激光处理对3种制件的表面结构、粗糙度、润湿性及胶接强度的影响;探究了激光处理对制件胶接强度增强机理。结果表明,... 采用激光技术对3D打印机制备的聚醚酰亚胺(PEI)、聚醚醚酮(PEEK)和聚醚醚酮/碳纤维(PEEK/CF)制件表面进行处理,研究了激光处理对3种制件的表面结构、粗糙度、润湿性及胶接强度的影响;探究了激光处理对制件胶接强度增强机理。结果表明,经激光处理的制件表面形成沟槽结构,表面粗糙度增加,制件表面由亲水变为疏水。以胶膜为胶黏剂时,PEEK和PEEK/CF制件的胶接强度分别从2.5 MPa和3.28 MPa增加到3.71 MPa和5.06 MPa;以液体胶为胶黏剂时,PEEK和PEEK/CF制件的胶接强度分别从2.36 MPa和2.41 MPa增加到6.79 MPa和5.06 MPa,提升幅度可达188%和154%。而激光处理对PEI制件的胶接强度无显著影响;激光处理的制件胶接强度的增强是制件胶接面间形成机械咬合作用和含氧官能团与胶黏剂间形成化学交联共同作用的结果。 展开更多
关键词 3D打印 胶接强度 飞秒激光
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Has Minority Foreign Investment in China's Banks Improved Their Cost Efficiency? 被引量:11
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作者 James Laurenceson fengming qin 《China & World Economy》 SCIE 2008年第3期57-74,共18页
Since 2001, foreign investors have been permitted to acquire minority ownership stakes m China's banks. This paper assesses whether there is any evidence of a cost efficiency payoff m those banks that have taken on f... Since 2001, foreign investors have been permitted to acquire minority ownership stakes m China's banks. This paper assesses whether there is any evidence of a cost efficiency payoff m those banks that have taken on foreign investment. Data envelopment analysis isfirst used to generate measures of cost efficiency for China's banks over the period 2001-2006. A second stage regression is then performed to determine whether foreign investment has an impact on cost efficiency. The results indicate a positive relationship, although one that is not statistically significant. Policy implications are discussed. 展开更多
关键词 BANKING cost efficiency foreign investment
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Impact of Foreign Bank Presence on Foreign Direct Investment in China 被引量:7
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作者 Steven Ongena Shusen Qi fengming qin 《China & World Economy》 SCIE 2015年第4期40-59,共20页
We analyze the impact of foreign bank presence on foreign direct investment (FDI) in China. The connection between the two couM be particularly relevant for an emerging economy like China because the supply of finan... We analyze the impact of foreign bank presence on foreign direct investment (FDI) in China. The connection between the two couM be particularly relevant for an emerging economy like China because the supply of financial services provided by banks may act as a constraining factor. Foreign bankpresence may then enable and foster FDI and not simply result from it. Our estimates demonstrate that FDI across regions in China is increasing in the existing network of regional branches of foreign banks, which itself is driven (and, therefore, instrumented) by the timing of the regional phasing out of the local limits for foreign banks on local currency business. The effect of foreign bank presence on FDI is particularly strong for some specific sectors (farming, manufacturing, construction, transportation, wholesale/ retail trade and real estate) if those sectors are strongly represented in the source economies. 展开更多
关键词 China foreign bank presence foreign direct investment
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