Measures for Improving the Aquatic Biodiversity on the Lower Sector of Bega Veche River

For surface water bodies, the main environmental objectives set out in the Water Framework Directive are aimed at achieving the good ecological status, respectively the good potential for heavily modified and artificial water bodies. The Banat River Basin Management Plan 2016-2021 identified several significant pressures at watercourses level, such as Bega Veche, which lead to the failure to achieve these objectives. This paper presents the proposed green measures which have a beneficial role from a biological and ecological point of view, which involve natural water retention measures and renaturation of water streams banks, including measures to improve the retention capacity at catchment level

Nanostructure, nanochemistry and grain boundary conductivity of yttria-doped zirconia

This work was directed at a comprehensive study of the role of the nanostructure and nanochemistry on the transport properties of yttria-stabilized zirconia. Alumina additions lead to a decrease Of sigma(gb) when the samples have clean grain boundaries, while sigma(gb) goes through a maximum in samples having glassy grain boundaries. The differences were attributed to the strong interaction between Al2O3 and SiO2 impurities leading to a glassy phase depletion at the grain-boundaries, due to a change in wettability. Moreover, XPS analyses show that Si and Y segregate near these interfaces according to a kinetic demixing process, explaining why a faster cooling rate after sintering has a beneficial effect on sigma(gb)

Transport properties of yttrium-doped zirconia-Influence of kinetic demixing

NRC publication: Ye

Physico-chemical properties of microarc oxidation of biocompatible coatings on titanium: Influence of electrochemistry parameters

cited By 2International audienceThe most important physico-chemical properties of materials with biomedical applications are: the morphology, the surface structure and the corrosion resistance. In this paper we follow the evolution of these properties, according to the conditions for obtaining TiO 2 coatings. These coatings were formed on titanium substrate by microarc oxidation (MAO). The electrolyte is a mixture consisting of β- glycerophosphate disodium salt pentahydrate and calcium acetate monohydrate. The obtained surfaces were characterized using scanning electron microscopy, X-rays analysis and corrosion tests. The anticorrosion properties of the layers were tested in biological environment (buffer solution) by means of electrochemical impedance spectroscopy (EIS), cyclic voltametry, Tafel tests. The results show a good electrochemical stability, combined with positive results regarding their biocompatibility