The purpose of this study was to assess heavy metal contamination and health risks for residents in the vicinity of a tailing pond in Guangdong, southern China. Water, soil, rice, and vegetable samples were collected from the area in the vicinity of the tailing pond. Results showed that surface water was just polluted by Ni and As, while groundwater was not contaminated by heavy metals. The con...

Peter Petrik,1,∗ Nitish Kumar, Miklos Fried, Balint Fodor, Gyorgy Juhasz, Silvania F. Pereira, Sven Burger and H. Paul Urbach Institute for Technical Physics and Materials Science, Hungarian Academy of Sciences, H-1121 Budapest, Konkoly Thege u. 29-33 Optics Research Group, Department of Imaging Physics, Faculty of Applied Sciences, Delft University of Technology, P. O. Box 5046, 2600GA Delft, ...

A general semiconductor-independent two-dimensional character of the carrier distribution in top-gate polymer field-effect transistors is revealed by analysing temperature-dependent transfer characteristics and the sub-bandgap absorption tails of the polymer semiconductors. A correlation between the extracted width of the density of states and the Urbach energy is presented, corroborating the 2...

We present a comparative experimental and theoretical investigation of the two–dimensional charge-transfer gap in the strongly correlated material Sr2CuO2Cl2. We observe an Urbach behaviour in the absorption profile over a surprisingly wide range of energies and temperatures. We present a model that accounts for phonon scattering to infinite order and which allows us to explain the data accurat...

Cemented tailings backfill is widely used in worldwide mining areas, and its development trend increasing due to the technical economic benefits. However, there no reliable simple machine learning model for prediction of compressive strength. In present study, research process use artificial intelligence algorithms predict strength cemented tailing was conducted, overcoming shortcomings traditi...

The Tauc–Lorentz–Urbach (TLU) dispersion model allows us to build a dielectric function from only few parameters. However, this is non-analytic and presents some mathematical drawbacks. As consequence of issue, the becomes inaccurate. In present work, we will adopt procedure conveniently transform TLU into self-consistent model. transformation involves integration original imaginary ϵ2 by using...