أرسل هذا في رسالة قصيرة: Photocatalytic degradation of methylene blue by C<inf>3</inf>N<inf>4</inf>/ZnO: The effect of the melamine/ZnO ratios

           _    _      _____    _____             
  ____    | || | ||   / ___//  |  ___||     ___   
 |    \\  | || | ||   \___ \\  | ||__      /   || 
 | [] ||  | \\_/ ||   /    //  | ||__     | [] || 
 |  __//   \____//   /____//   |_____||    \__ || 
 |_|`-`     `---`   `-----`    `-----`      -|_|| 
 `-`                                         `-`