The hydrogen fuel cell is a quite promising green device, which could be applied in extensive fields. However, as complex nonlinear system involving number of subsystems, the requires multiple variables to effectively controlled. Oxygen excess ratio (OER) key indicator controlled avoid oxygen starvation, may result severe performance degradation and life shortage stack. In this paper, air suppl...

Experimental observations of extensive air showers have revealed an excess the muon content with respect to their theoretical simulations, which we refer as puzzle. This puzzle hampers a precise determination ultra-high-energy cosmic ray mass composition. We investigate potential producing states dense quark-gluon matter (which call fireballs) resolve quantified data from Pierre Auger Observato...

Indoor air purifiers are advertised as safe household products for health-conscious individuals, especially for those suffering from allergies and asthma. However, certain air purifiers produce ozone (O3) during operation, either intentionally or as a byproduct of air ionization. This is a serious concern, because O3 is a criteria air pollutant regulated by health-related federal and state stan...

Human and animal toxicology has had a profound impact on our historical and current understanding of air pollution health effects. Early animal toxicological studies of air pollution had distinctively military or workplace themes. With the discovery that ambient air pollution episodes led to excess illness and death, there became an emergence of toxicological studies that focused on industrial ...

Measurements of vapour pressure, taken four times a day over a 3-year period, were used to investigate the urban influence on diurnal and annual patterns of vapour pressure differences. The examined settlement is a medium-sized city without significant relief in the Great Hungarian Plain. Its regional climate is continental with a long warm season. On the basis of the results, the air in the ci...

in the present study the adiabatic temperature of gaseous fuels were calculated and the influence of effective parameters of flame temperature was discussed. firstly, a new computational program named ftc (flame temperature calculations) was prepared to calculate the adiabatic flame temperature and then the effect of initial temperatures of combustion air and fuel, excess air content and oxygen...

Copollutants found in air samples and other complex chemical mixtures may alter the metabolism, and thus the biological activity, of chemical carcinogens. As an initial step to determine whether the metabolism and DNA binding of carcinogenic nitrated polycyclic aromatic hydrocarbons found in diesel exhaust particles are altered by copollutants, we studied the effect of pyrene on the metabolism ...

BACKGROUND The association between cardiovascular mortality and winter cold spells was evaluated in the population of the Czech Republic over 21-yr period 1986-2006. No comprehensive study on cold-related mortality in central Europe has been carried out despite the fact that cold air invasions are more frequent and severe in this region than in western and southern Europe. METHODS Cold spells...

The use of renewable energies, especially in metropolises has led to a reduction in environmental pollution and greater access to clean, renewable and sustainable energy. This paper evaluates the effectiveness of a national plan adopted by the Tehran city council for reducing air pollutions. This plan is designed to increase the share of renewable energies in residential buildings. This study a...