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           __   __    _  __     ___      _  _   
  ____     \ \\/ //  | |/ //   / _ \\   | \| || 
 |    \\    \ ` //   | ' //   | / \ ||  |  ' || 
 | [] ||     | ||    | . \\   | \_/ ||  | .  || 
 |  __//     |_||    |_|\_\\   \___//   |_|\_|| 
 |_|`-`      `-`'    `-` --`   `---`    `-` -`  
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發送短信 : Andreev reflection at a NS interface for non-normal angle of incidence