hydropost hydro Hydroxymethylglutaryl-CoA reductase inhibitors Hydrodynamic Lubrication Principles and Practice hydroxyapatite/polyurethane scaffold material Hydrodynamic dispersion parameter of groundwater hydroxypropyltrimethyl ammonium chloride chitosan hydroxypropyl methylcellulose ophthalmic solution hydroxyl-terminated liquid polybutadiene rubber Hydrocracking of polycyclic aromatic hydrocarbons hydroenergy computation for hydroelectric station Hydrologic information automatic telemeter system