Text this: Ultraviolet-ray treatment of polysulfone membranes on the O<inf>2</inf>/N<inf>2</inf> and CO<inf>2</inf>/CH<inf>4</inf> separation performance

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