Higher-order nonlinear electron-acoustic solitary excitations in   partially degenerate quantum electron-ion plasmas
  Propagation of dressed solitary excitations are studied in a partially degenerate quantum plasma in the framework of quantum-hydrodynamics (QHD) model using multiple scales technique. The evolution equation together with a linear inhomogeneous differential equation is solved using Kodama-Taniuti renormalizing technique. It is shown that the type of solitary excitations (bright or dark) is defined by two critical plasma parameter values. 
M. Akbari-Moghanjoughi
astro-ph.SR