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具有正交约束的多因子可加性实验模型参数估值的无偏性
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作者 谭立扬 《北京工业大学学报》 CAS 1987年第4期1-6,共6页
一个好的实验模型选择的主要准则之一,是模型中参数的估值应该是无偏的。本文在“多因子可加性实验模型参救估值及唯一性”一文的基础上,进一步证明了在因子间各级交互效应满足正交约束及正态误差分布条件下,模型参数估值是无偏的。
关键词 正交约束 可加性实验 正态误差分布 无偏
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Scratching and Turning Experiments on Machinability of Optical Glass SF6 in Diamond Cutting Process 被引量:1
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作者 贾鹏 周明 《Transactions of Tianjin University》 EI CAS 2011年第4期280-283,共4页
To improve the machinability of optical glass and achieve optical parts with satisfied surface quality and dimensional accuracy, scratching experiments with increasing cutting depth were conducted on glass SF6 to eval... To improve the machinability of optical glass and achieve optical parts with satisfied surface quality and dimensional accuracy, scratching experiments with increasing cutting depth were conducted on glass SF6 to evaluate the influence of cutting fluid properties on the machinability of glass. The sodium carbonate solution of 10.5% concentration was chosen as cutting fluid. Then the critical depths in scratching experiments with and without cutting fluid were examined. Based on this, turning experiments were carried out, and the surface quality of SF6 was assessed. Compared with the process of dry cutting, the main indexes of surface roughness decrease by over 70% totally. Experimental results indicated that the machinability of glass SF6 can be improved by using the sodium carbonate solution as cutting fluid. 展开更多
关键词 diamond cutting optical glass MACHINABILITY scratching experiment cutting fluid
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