Cf = skin friction coefficient CD = drag coefficient CDf = friction drag coefficient CDp = pressure drag coefficient h = step height M0 = freestream Mach number Patm = atmospheric pressure Pi = stagnation pressure Re = freestream Reynolds number Ti = stagnation temperature U = velocity U = normalized velocity Uτ = friction velocity X = longitudinal coordinate Z = vertical coordinate Z = normali...

Research on automatic tracking solar concentrator photovoltaic systems has gained increasing focus in developing the solar PV technology. A paraboloidal concentrator with secondary optic is developed for a three-junction GaInP/GalnAs/Ge solar cell. The concentration ratio of this system is 200 and the photovoltaic cell is cooled by heat pipe. A detailed analysis on the temperature coefficient i...

Electrical conductivity and Seebeck coefficient in regioregular poly(3-hexylthiophene) (RR-P3HT) doped with iodine (I2) have been studied in temperature (T) range from 4.2 K to 300 K and from 77 K to 300 K, respectively. In spite of high doping rate (about 30%), RR-P3HT doped with I2 shows a semiconductive behavior in view of temperature dependence of both electrical conductivity and Seebeck co...