TY - RPRT TI - Phase shift method to estimate solids circulation rate in circulating fluidized beds AU - Ludlow, James Christopher AU - Panday, Rupen AU - Shadle, Lawrence J. PY - 2013 DO - 10.1021/ie301275c UR - https://www.osti.gov/biblio/1129744 ID - 1129744 ER -