GIK;
Institute;
of;
Engineering;
Sciences;
and;
Technology,;
Topi,;
District;
Swabi,;
NWFP;
23640,;
Pakistan;
Physical;
Technical;
Institute;
of;
Academy;
of;
Sciences,;
Rudakr;
Ave;
33,;
Dushanbe,;
734025,;
Tajikistan;
School;
of;
Materials;
&;
Mineral;
Resources;
Engineering,;
Engineering;
Campus,;
Universiti;
Sains;
Malaysia,;
14300;
Nibong;
Tebal,;
Penang,;
Malaysia;