Concentración de gases de efecto invernadero en los motores de combustión interna de los grupos electrógenos

The work is in the Oil Fuel Maintenance and Generation Company of Pinar del Rio, where the installation of facilities is composed of batteries of generators with Hyundai engines, which run on diesel and fuel. In order to carry out a detailed analysis of the atmospheric emissions resulting from the combustion, a sampling was made of the exhaust gases of the engines, as well as the areas of the neighboring houses, for a month, with exhaust gas analyzers, with a view to determining the possible contamination of the environment by these gases. The results obtained, that the elements contained in the emissions do not exceed the current parameters of the regulations in force, which regulate.El trabajo se desarrolló en la Empresa de Mantenimiento y Generación Eléctrica Fuel Oil de Pinar del Río donde la instalación de emplazamientos se encuentra compuesto por baterías de grupos electrógenos con motores Hyundai, que operan con diésel y fuel-oil. Con el propósito de realizar un análisis detallado de las emisiones atmosféricas producto de la combustión, se realizó un muestreo de los gases de escape de los motores, así como en las áreas de las casas colindantes, durante un mes, con analizadores de gases de escape, con vistas a determinar la posible contaminación del medio ambiente por estos gases. Los resultados obtenidos, muestran que los elementos contenidos en las emisiones no sobrepasan los establecidos por las normas aplicables vigentes, que regulan éstas

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