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| 1 | Numerical simulation and experimental study for rheo-forged component using direct and indirect die system显示文摘Sand casting and die casting processes have been used widely for complex automotive products such as knuckle, arm, etc.Usually, a part fabricated by casting has limited strength due to manufacturing defects such as the dendrite structure, segregation and porosities.As an attempt to offer a solution to these problems, forging has been used as an alternative process.However, the forging process provides limited formability for complex shape products.Rheo-forging of metal offers not only superior mechanical strength but also requires significantly lower machine loads than solid forming processes.In order to produce semi-solid materials of the desired microstructure, a stirring process is applied during solidification of molten metal.The results of an A356 aluminum alloy sample, which are obtained by experiment and by simulation using DEFORM 3D, are present. | H.H.KIM C.G.KANG | 2010 | Transactions of Nonferrous Metals Society of China2010，20，9： | 2 |
| 2 | Development of mathematical model with a genetic algorithm for automatic arc welding process显示文摘This paper is to represent new algorithms to predict process parameters on top-bead width in robotic gas metal arc(GMA) welding process.The models have been developed:linear, curvilinear and intelligent model based on full factorial design with two replications.Regression analysis was employed for optimization of the coefficients of linear and curvilinear models, while genetic algorithm(GA) was utilized to estimate the coefficients of an intelligent model.Not only the fitting of these models were checked and compared by using a variance test(ANOVA), but also the prediction on top-bead width using the developed models were carried out based on the additional experiments.The developed models were employed to investigate the characteristic between process parameters and top-bead width.Resulting solutions and graphical representation showed that the intelligent model developed can be employed for prediction of bead geometry in GMA welding process. | D.T.Thao I.S.Kim J.W.Jeong J.H.Lee J.Y.Shim H.H.Kim | 2010 | Acta Metallurgica Sinica(English Letters)2010，23，3： | 0 |
| 3 | 城市热岛显示文摘应用陆地卫星/TM数据资料在首都华盛顿地区结合利用推导的波谱反射率与温度资料研究了城市热岛现象,分析了5种地表类型的复合表面能。结果表明城市加热是由于建筑、沥青、裸露土壤和短草草地构成快速加热,使城市地表引起过量热。总之,夏日加热现象开始于早晨,它可以比附近的林区高约10℃。 | H.H.Kim 刘允良 | 1993 | 世界地质1993，12，3： | 0 |
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