Improvement of pot mold and coating in pot casting
zhao fang-xia 1; zhang zhen-zhong 2 (1 dept.of m.e.e.of shaanxi institute of technology; hanzhong 723003; china; 2 northwestern polytechnical university; xi an 710072; china)
An electromagnetic analysis on birefringence phenomenon
ma xin-li 1; l jian 2 (1 dept. of b. c. of shaanxi institute of technology; hanzhong 723003; china; 2 dept.of s. s. of shaanxi institute of technology; hanzhong 723000; china)