125301-7474 IJET-IJENS @ February 2012 IJENS I J E N S Abstract—To better understand the vacuum arc remelting (VAR) process, a 3D finite element model is established to analyzing the electromagnetic, temperature and flow fields of titanium alloy ingot during steady state melting process using ANSYS software. The research results show that the current flows from the crucible to consumable electr...

Logistic Regression for Crystal Growth Process Modeling through Hierarchical Nonnegative Garrote based Variable Selection Hongyue Sun, Xinwei Deng, Kaibo Wang, and Ran Jin Grado Department of Industrial and Systems Engineering, Virginia Tech., Blacksburg, VA 24061, USA Department of Statistics, Virginia Tech., Blacksburg, VA 24061, USA Department of Industrial Engineering, Tsinghua University, ...

The heat flow control is an important link in directional solidification. Mathematical model for unidirectional solidified ingot with multiple sets of cooling system was established. Temperature field and flow field influenced by traditional water-cooled stool and improved one during solidification of a 45 t was carried out by using ProCAST software. The results of temperature distribute and fl...

The segregation of Alloy 718 ingots and the technical factors which affect the ingot homogenization practice are studied in this paper. The segregation and melting point of Alloy 7 18 ingots are studied by DTA, electron microprobe and structure analysis. The elimination of Laves phase is studied in detail. After the solution of Iaves phase the segregation elimination of Nb is reviewed further. ...

Deliberate dopant compensation has proven to be an effective way to control ingot resistivity, although the impact of compensation on carrier recombination and mobilities remains under investigation. This paper summarizes recent findings regarding the carrier transport properties of compensated silicon. The capacity of common mobility models to describe compensated silicon is reviewed and compa...

Both optimal and suboptimal distributed parameter state estimation @ o m were applied in real time to a heated cylindrical ingot. Following this, deterministic and stochastic feedback controllers were implemented Detailed studies of the effects of variables such as sensor choice, measurement error, model acanacy, controller and estimator parameters, and computational approximations on the contr...

2014 Some aspects of the thermodynamic state of CdTe crystals grown by different zone passing techniques (sealed ingot zone refining technique and THM in tellurium solvent) are considered with regard to the general objective of getting high resistivity crystals. A vapour growth technique, called sublimation THM, which reduces several drawbacks of classical THM using a tellurium solvent, is deve...