Modelling of methane partial oxidation in an asymmetric multilayered membrane reactor

C

Development of layered anode structures supported over Apatite-type Solid Electrolytes

Apatite-type lanthanum silicates (ATLS) materials have attracted interest in recent literature as solid electrolytes for SOFCs. The fabrication of an ATLS based fuel cell with the state-of-art electrodes (NiO/YSZ as anode and LSCF or LSM as cathode) can show degradation after long operation hours due to Si diffusion mainly towards the anode. In this work, we report a “layer-by-layer anodic electrodes” fabrication by means of spin coating and physical spraying. The overall aim of this work is the successful fabrication of such a layered structure including suitable blocking layers towards the inhibition of Si interdiffusion from the apatite electrolyte to the anode. The results showed that the deposition of 3 layers of LFSO/GDC (3μm), NiO/GDC (4μm) and the final NiO/YSZ anode layer provided a stable half-cell, with no solid state reaction occurring among the electrodes and no Si diffusion observed towards the anode after thermal treatment at 800°C for 120h

Analysis of the flammability of forests in the Orenburg region

The article provides information on the dynamics of forest fires in the forestry districts of the Orenburg region, the potential danger to the gas processing and oil production industries of the region, and the impact of fires on forest phytocenoses. The Orenburg region, compared to other regions of Russia, is characterized by a high level of anthropogenic impact, so it is the most vulnerable, prone to fires, including forest fires, which in recent years tend to increase. The analysis of fire dynamics has shown that in the sparsely forested territory of the Orenburg region, forest fires cause serious economic damage every year. The territory of the Orenburg region is characterized by a high risk of fires. During the period under review, fires occurred everywhere. The most fire-prone areas are the territories confined to the transition from steppe to dry-steppe zones, as well as those located near large population centers. It is recommended to take into account the presented data when planning forest protection measures in the territory of the Orenburg region

Search for dark matter produced in association with bottom or top quarks in √s = 13 TeV pp collisions with the ATLAS detector

A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √s = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements