Non-uniform illumination of solar cells leads to a decrease in efficiency. Two cases were investigated experimentally: loss of power due to the shadowing of a fringe area of one cell, and loss of output of two cells which were connected in series and were illuminated to different degrees. The results show that losses due to these effects will reduce the output of concentrator photovoltaic systems working
at low concentration conditions by a few per cent only.
How do changes in expected inflation affect gold prices? Using unexpected changes in the Consumer Price Index (CPI) this paper shows that surprises in the CPI do not affect gold spot prices. The results indicate that investors anticipating changes in inflation expectations should design speculation strategies Nike Free 4.0
in the bond markets rather than the gold markets. Additionally, investors cannot determine market inflation expectations by examining the price of gold.
An advanced spectrometer for time differential perturbed γ-γ-angular correlation measurements is presented. It consists of six Roshe Run Hyperfuse
detectors with BaF2-scintillators and is designed to reduce the data collection time as much as possible. Experimental results with “illumination” times of the order of 100 s are presented. This “camera” storing 30 coincidence subgroups simultaneously is compared with a conventional four-detector system with eight subgroups.