provided is setting {HEAD ~ means} for {TAIL ~ temperature gradient} by making most of a differential diffusion velocity due to thermal diffusion 
provided is setting { HEAD ~ means } for { TAIL ~ temperature gradient } by making most of a differential diffusion velocity due to thermal diffusion
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH