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Evolution of globular microstructures during processing of aluminium slurries 被引量:4
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作者 Yucel BIROL 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第1期1-6,共6页
Slurry processing experiments were performed with AlSi7Mg0.6 to identify the globularization mechanisms.The melt sample water quenched slightly above the liquidus point is predominantly dendritic while that cooled int... Slurry processing experiments were performed with AlSi7Mg0.6 to identify the globularization mechanisms.The melt sample water quenched slightly above the liquidus point is predominantly dendritic while that cooled into the semi-solid temperature range internally via stirring the melt with a rotating cylindrical block of the alloy itself becomes fully globular.The globules are much smaller when internal cooling and stirring are employed longer to achieve higher solid fractions before casting.Coarse dendrite fragments of various sizes are revealed,in the case of stirring after an initial fraction of solid is first formed without the benefit of additional internal cooling. 展开更多
关键词 Al alloys AlSi7Mg0.6 alloy SOLIDIFICATION microstructure internal cooling STIRRING solid fraction
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ROBUST H∞ CONTROL FOR UNCERTAIN NONLINEAR SYSTEMS 被引量:2
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作者 Weiping BI 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2007年第4期545-553,共9页
This paper studies the robust H∞ disturbance attenuation with internal stability for uncertain nonlinear control systems. By adding one power integrator technique, this paper designs a explicit smooth robust dynamic ... This paper studies the robust H∞ disturbance attenuation with internal stability for uncertain nonlinear control systems. By adding one power integrator technique, this paper designs a explicit smooth robust dynamic feedback law while rejecting the disturbance to any specified degree of accuracy. Further, the example and simulation results show the effectiveness of the proposed schemes. 展开更多
关键词 Internal stability robust dynamic feedback specified degree.
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