Liquid Crystal as Solar Cell Concentration

Abstract

In this work, a solar concentrator was constructed using liquid crystalline material of the isotropic type to increase the efficiency of the solar cell. Two different concentrations of this liquid crystal were prepared and mixed with epoxy resin to manufacture the plates with an equal area of solar cell space. having Considered this kind of mixture, it was found that a high concentration of this material has contributed to increase the efficiency of the solar cell from 8.51 to 10.85, were also calculated the absorption, fluorescence spectra, short circuit current (Isc), open circuit voltage (Voc) and fill factor(FF). The quantum efficiency of fluorescence in this concentration was (93%, 90%).

Dose assessment for radon and thoron concentrations in iraqi thermostone bricks

“…1. Scheme device RAD7 [18] Radon concentration (CRn), equilibrium factor (F) that has been determined to be 0.40 for 222Rn and 0.02 for 220 Rn as determined by the UNSCEAR study, and residence time in the room (T= 7008 h, considering mean time spent by humans is 80% inside rooms), are all factors that affect the annual effective dose produced on by indoor exposure. We can write the equation as follows: [19] 𝐷𝑜𝑠𝑒 ( EEC is an equilibrium-equivalent concentration to effective dose conversion (9 ×10 -6 mSv h -1 per Bq/m 3 for 222 Rn and 40 ×10 -6 mSv h -1 per Bq/m 3 for 220 Rn).…”