In {TAIL ~ one embodiment, phenolic resins}, pyrolyzable binders, or {HEAD ~ other sources} of carbon are used 
In
In { TAIL ~ one embodiment , phenolic resins } , pyrolyzable binders , or { HEAD ~ other sources } of carbon are used
REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH