أرسل هذا في رسالة قصيرة: Materials Issues for Generation IV Systems : Status, Open Questions and Challenges

 _    _      ___      _  __     ___      _____   
| |  | ||   / _ \\   | |/ //   / _ \\   / ____|| 
| |/\| ||  | / \ ||  | ' //   / //\ \\ / //---`' 
|  /\  ||  | \_/ ||  | . \\  |  ___  ||\ \\___   
|_// \_||   \___//   |_|\_\\ |_||  |_|| \_____|| 
`-`   `-`   `---`    `-` --` `-`   `-`   `----`