Tribochemical reactions frequently are decisive for friction and wear. In article number 2001673 by Christian Greiner co-workers, such investigated between copper its oxides in contact with sapphire. The authors find that freshly formed beneficial reducing friction, especially as sliding progresses. Sliding even provides enough energy a reduction of oxide to metallic copper.

The use of cermets as fuel electrodes for solid oxide electrolysis cells requires permanent circulation of reducing gas, e.g. H2 or CO, so called safe gas, in order to avoid oxidation of the metallic phase. Replacing metallic based electrodes by pure oxides is therefore proposed as an advantage for the industrial application of solid oxide electrolyzers. In this work, full-ceramic symmetrical s...

In Flanders, the northern part of Belgium, about 31% of the produced amount of MSWI bottom ash is recycled as secondary raw material. In view of recycling a higher percentage of bottom ash, a particular bottom ash fraction (Ø 0.1-2mm) was studied. As the leaching of this bottom ash fraction exceeds some of the Flemish limit values for heavy metals (with Cu being the most critical), treatment is...

A severe nuclear accident can lead to the release of radiotoxic iodine compounds in either aerosol form (e.g. metal iodides or oxides) gaseous organic iodide as CH3I inorganic I2) species. 131I is particularly dangerous because its possible absorption by human body especially thyroid. Gaseous mainly formed containment building, dispersed case outside releases and may contribute short term long-...

The effect of poly-N-vinylpyrrolidone on the size characteristics, morphology, composition particles obtained by reduction cobalt ions in aqueous solutions, and distribution over surface glass microspheres has been studied. absence leads to formation with a 200 nm microspheres. use made it possible obtain ranging from 30 300 nm, more localized resulting are mixture metallic oxides.

we call a module  essentially retractable if homr for all essential submodules n of m. for a right fbn ring r, it is shown that: (i)  a non-zero module  is retractable (in the sense that homr for all non-zero ) if and only if certain factor modules of m are essentially retractable nonsingular modules over r modulo their annihilators. (ii)  a non-zero module  is essentially retractable if and on...

Cellular materials, metallic bodies with gaseous voids, are a promising class of materials that offer high strength accompanied by a relatively low mass. Unfortunately, existing manufacturing techniques constrain a designer to a predetermined part mesostructure, material type, and macrostructure. In this paper, the authors document their design rationale for the selection of the Three-Dimension...