أرسل هذا في رسالة قصيرة: Effect of vibro-milling time on phase formation and particle size of lead titanate nanopowders

 _    _     _____     ______   __   __   _    _   
| || | ||  |  ___||  /_   _//  \ \\/ // | || | || 
| || | ||  | ||__    `-| |,-    \ ` //  | || | || 
| \\_/ ||  | ||__      | ||      | ||   | \\_/ || 
 \____//   |_____||    |_||      |_||    \____//  
  `---`    `-----`     `-`'      `-`'     `---`