Background: In recent years, there has been an increased interest toward non-lead radiation shields consisting of small-sized filler particles doped into polymer matrices. In this paper, we study a new polyvinyl alcohol (PVA)/WO3 composite in the presence of high-energy gamma photons through simulation via the Monte Carlo N-Particle (MCNP) simulation code. Materia...

1 While lead-frame and wire-bond packages can be provided as eutectic or lead-free, currently Altera flip-chip packages are RoHS compliant. We use Exemption #15 for the first Level Connections between the flip-chip die to the substrate (RoHS Exemption #15: Lead in solders to complete a viable electrical connection between the semiconductor die and the carrier within the integrated circuit flip-...

Perovskite solar cells (PSCs) have attracted great attention all over the world because of advantages adjustable band gap, long carrier diffusion length, high light-absorption coefficient, and solution processability organic metal halide perovskite absorbers. As first-generation PSCs, highest efficiency lead PSCs has reached 25.5%, which is comparable with that silicon cells. However, toxicity ...

In this paper the performance of a sample of German companies is measured by comparing the initially invested capital adjusted for cost of capital, dividends paid, share repurchases and equity raised with the market value at the end of the holding period. All possible holding periods between 1987 and 2000 are covered. The sample is subdivided into companies listed in the DAX-, MDAXand SMAX-inde...