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Relationships between the surface quality of a single crystal copper ingot and the process parameters of a heated mould continuous casting method 被引量:1
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作者 G.J.Xu Z.F.Ding +3 位作者 Y.T.Ding S.H.Kou G.L.Liu c.l.feng 《China Foundry》 SCIE CAS 2004年第S1期62-66,共5页
The relationships between the surface quality of a single crystal copper ingot and the process parameters of heated mould continuous casting method were studied experimentally using our own design of horizontal heated... The relationships between the surface quality of a single crystal copper ingot and the process parameters of heated mould continuous casting method were studied experimentally using our own design of horizontal heated mould continuous casting apparatus, and the mechanism by which process parameters affect the surface quality of a single crystal copper ingot is analyzed in the present paper. The results show that the process parameters affect the surface quality of a pure copper ingot by affecting the position of the liquid-solid interface in the mould. The position of the liquid-solid interface in the mould must be controlled carefully within an appropriate range, which is determined through a series of experiments, in order to gain a single crystal copper ingot with good surface quality. 展开更多
关键词 heated mould continuous casting single crystal copper surface quality process parameter
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华北地区土壤水分问题——Ⅰ.土壤水的扩散机制及水在剖面中运动的限制
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作者 冯兆林 陈玲爱 《土壤学报》 1958年第1期1-24,共24页
华北地区在土壤水分问题上,据我们估计,存在着五种情况:第一种情况是在秋耕时期耕层的土壤水分是适宜于耕翻和耙耘的。在耕翻和耙耘的适当时,冬季土壤水分不但不丢失反而在春季开冻时剖面上部有不同程度的增加,冬季土壤水分结冻在20—5... 华北地区在土壤水分问题上,据我们估计,存在着五种情况:第一种情况是在秋耕时期耕层的土壤水分是适宜于耕翻和耙耘的。在耕翻和耙耘的适当时,冬季土壤水分不但不丢失反而在春季开冻时剖面上部有不同程度的增加,冬季土壤水分结冻在20—50厘米,可是在解冻后随着气温的上升和干风的到来(约在2月下旬或3月上旬),土壤水分蒸发的丢失,就使有些年份的春季下种出苗遇到困难,特别是棉花、小米和玉米的下种和出苗。 展开更多
关键词 扩散机制 剖面 华北地区 冬季土壤水分
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