Air pollutant gases include ground-level ozone, carbon monoxide, sulfur dioxides and nitrogen oxides, particulate matter, organic compounds, including polycyclic aromatic hydrocarbons and endotoxins, and metals [1]. Nitrogen is released during fuel combustion and combines with oxygen atoms in the atmosphere to produce nitric oxide and other nitrogen oxides, which can be inhaled by the upper res...

The rates of carbon monoxide recombination to six different kinds of chemically modified heme with various substituents at positions 2 and 4 have been studied in the proteinfree state (free heme) by the laser flash photolysis method in a mixture of ethylene glycol and 0.02 N NaOH (80:20, V/V) (80% ethylene glycol). The carbon monoxide combination rate constants to the various free hemes obtaine...

The aim of this research work is to build a regression model of air quality by using the multivariate adaptive regression splines (MARS) technique in the Oviedo urban area (northern Spain) at a local scale. To accomplish the objective of this study, the experimental data set made up of nitrogen oxides (NO x ), carbon monoxide (CO), sulfur dioxide (SO2), ozone (O3), and dust (PM10) was collected...

The feasibility of renewable energy technology, hydrogen production by water electrolysis, depends on the design of efficient and durable electrocatalyst composed of earth-abundant elements. Herein, a highly active and stable nonmetallic electrocatalyst, nitrogen doped hexagonal carbon (NHC), was developed for hydrogen production. It exhibited high activity for hydrogen evolution with a low ove...

Non-native fish species have been implicated in native fish extinction and endangerment in the United States. Access to standardized data from across the American West allowed the opportunity to study the distribution and abundance of native and non-native fish species at a scale that has rarely been approached previously. Nonnative fishes comprise 1 of every 4 individual fish in the West and a...

Recent U.S. Environmental Protection Agency emissions regulations have resulted in lower emissions of particulate matter and oxides of nitrogen from heavy-duty diesel trucks. To accelerate fleet turnover the State of California in 2008 along with the Ports of Los Angeles and Long Beach (San Pedro Bay Ports) in 2006 passed regulations establishing timelines forcing the retirement of older diese...

Abstract Systematic experimental data have been obtained on the results of catalytic chemical reactions in a microchannel reactor for synthesis methanol from gas. Synthesis gas contains hydrogen, carbon monoxide and dioxide, as well nitrogen ratio 58/29/5/8. The experiments were carried out at different flow rates temperature range 190-260C. Experiments also fixed bed pressures.

Availability analysis is an effective approach to studying energy conversion in systems and identifying inefficiency. In the present study, a single-zone model was used to examine energy performance parameters and heat release rates. The governing equation of availability analysis was applied in the model, and the possibility of using biodiesel produced from sunflower oil as diesel engine was i...

Asthma is one of the most common diseases in childhood, which has been increased during last decade because of epidemiological pattern changes with climate and industrialization of the communities. There are some controversies on the relationship between air pollution and asthma. Tehran, as the capital of Iran, is one of the densest populations and is one of the most polluted cities in the worl...