Towards the end of the 1940s the air’s contamination began in Mexico. It just happened when Mexico starts its industrial growing. During these years the population increased notably. Industrial growing in the 1950s was carried through an urbanization process (Restrepo, 1992). Mexico City was the first because it had industries, services, government offices, culture attractions and higher educat...

We present the results of a spectral-line survey W51e1/e2 star-forming region at 68-88 GHz. 79 molecules and their isotopologues were detected, from simple diatomic or triatomic molecules, such as SO, SiO, CCH, to complex organic compounds, CH$_3$OCH$_3$ CH$_3$COCH$_3$. A number lines that are absent Lovas list molecular observed in space most these identified. significant detected typical for ...

Utilization of fossil fuels significantly worsens the problems global warming due to emission carbon dioxide and other gases with greenhouse effect. Agricultural machinery diesel engines has its own negative contribution this harmful gases, because tractors are not only used as working traction machines, but also on roads for transporting goods people. In work, was measured in simulated operati...

We present the discovery in TMC-1 of vinyl acetylene, CH 2 CHCCH, and detection, for first time a cold dark cloud, HCCN, HC 4 N, 3 CN. A tentative detection CCH is also reported. The column density acetylene (1.2 ± 0.2) × 10 13 cm −2 , which makes it one most abundant closed-shell hydrocarbons detected TMC-1. Its abundance only three times lower than that propylene, CHCH . densities derived HCC...

Abstract The study aims to examine the effects of palm biodiesel blended with additives in compression ignition (CI) engine. Biodiesel as fuel was limited by challenges such lower calorific value (CV) and higher viscosity while increasing brake specific consumption (BSFC) nitrogen oxides (NO x ) emissions. Nanoparticles antioxidant added play an essential role avoiding hindrances biodiesel. ant...