共查询到11条相似文献,搜索用时 15 毫秒
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自2007年下半年起,巴西铝工业经历了一个特殊的时期-反垄断和调整外贸政策.丰西反垄断局表示将改变一些特种产品如特种铝板的进口关税.本文着重对拉美比次关税调整进行了分析. 相似文献
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Over the last twenty years, there has been a discernable increase in the number of sholars who have focused their research on metal production, working and use in antiquity, a field of study which has come to be known as ARCHAEOMETALLURGY. Materials scientists and conservators have worked primarily in the laboratory while archaeologists have conducted fieldwork geared to the study of metal technology in a cultural context with laboratory analysis as one portion of the interpretive program. 相似文献
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Thomas Holden Aaron D. Krawitz Ian Anderson 《JOM Journal of the Minerals, Metals and Materials Society》2006,58(3):64-67
Six neutron sources are available for research in North America. The facilities are funded by their respective governments
as user-facilities. User proposals are accepted on a regular basis and if they are success ful in competition with all the
other proposals, time is allocated for the experiments. This paper describes the neutron sources and their capabilities.
Thomas M. Holden retired from the National Research Council of Canada at Chalk River in 1998. He is currently head of the
instrument development team for the VULCAN engineering diffractometer at the Spallation Neutron Source (SNS). Aaron D. Krawitz
is professor emeritus in the Department of Mechanical and Aerospace Engineering at the University of Missouri in Columbia,
Missouri, and Ian Anderson is Director of Experimental Facilities Division at the SNS at Oak Ridge National Laboratory. 相似文献
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美国铸造协会AFS铸铁分会熔炼技术委员会(5-L)对北美球铁生产技术进行了一次调查,向美国、加拿大及墨西哥球铁生产厂寄送了508份问卷,收回187份答卷。其中大型铸造厂(〉200t/周)74家,小型铸造厂(〈200t/周)113家。 相似文献
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根据铸拉工艺的特点和钢、铝变形性能,假设钢丝为刚性体,同时,假设变形体铝层的流动速度在截面上呈二次函数分布。在此基础上利用流函数建立了变形区速度场,并利用计算机对变形能进行求极小值,得到了变形区的速度分布及拉拔力。计算值与实测值比较吻合。 相似文献
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作者导出了包括氧化铝中α-Al2O3含量、电流效率、电解温度和室温四变量在内的理论能耗和理论能耗电压计算公式。进一步提出铝电解技术参数相互适应原理,根据这一原理,随着电解技术条件的改变及时调整能量平衡.电流效率将会提高。 相似文献