Background: Industrialization and urbanization had a devastating impact on public health and caused an increase in health related morbidity and mortality. In fact, asthma is a chronic condition which is considered as one of the significant challenges of public health. In this study, we investigated the association of air pollution and weather conditions with excess emergency ward admissions o...

in this study the performance and emissions characteristics of a heavy-duty, direct injection, compression ignition (ci) engine which is specialized in agriculture, have been investigated experimentally. for this aim, the influence of injection timing, load, engine speed on power, brake specific fuel consumption (bsfc), peak pressure (pp), nitrogen oxides (nox), carbon dioxide (co2), carbon mon...

This preliminary study presents a new method for the determination of dissolved gases in sea-water. After headspace extraction, gaseous compounds are separated by GC on a dual column adsorption system. The individual species are thereafter eluted to three different detectors (thermal conductivity, flame ionization and FPD) using a second switching valve. The analysis is quantitative for methane...

Ammonia (NH3) is produced from atmospheric nitrogen and hydrogen from a hydrocarbon source. Natural gas is the most commonly used hydrocarbon feedstock for new plants; other feedstocks that have been used include naphtha, oil, and gasified coal. Natural gas is favored over the other feedstocks from an environmental perspective. Ammonia production from natural gas includes the following processe...

Using the “equivalent cores” approximation in combination with a Born-Haber cycle we calculate core-level binding energies for adsorbates on metal surfaces. Since accurate thermodynamic data are required for the molecule both in the initial and in the final state, we restrict our discussion to adsorbed carbon monoxide, surface species that contain nitrogen and the halogens bromine and iodine. R...

J. Matusiak, J. Wyciślik, Institute of Welding, Gliwice, Poland The article presents the results of research into the fume and gas emission during MIG/MAG arc weld brazing. Investigations were conducted for hot dip coated steel sheets with zinc and zinc and iron alloy coatings. Steel grades of DX 54D Z 100 MBO and DX 54D ZF 100 RBO were used during research. ARC shielding gases applied were Ar ...

The atmosphere is an oxidizing medium. Many environmentally important trace gases emitted from the Earth’s surface are removed from the atmosphere by oxidation. The list includes methane and other organic compounds, carbon monoxide, nitrogen oxides, and sulfur gases (Table 1). Understanding the processes and rates by which species are oxidized in the atmosphere, i.e., the oxidizing power of the...

Aircraft measurements of nitrogen oxides, ozone, and carbon monoxide during MINOS 2001: distributions and correlation analyses J. Heland, H. Ziereis, H. Schlager, M. de Reus, M. Traub, J. Lelieveld, G.-J. Roelofs, P. Stock, and A. Roiger Deutsches Zentrum für Luftund Raumfahrt (DLR), Oberpfaffenhofen, Germany Max-Planck-Institute for Chemistry (MPI-CH), Mainz, Germany Institute for Marine and A...

We present a new method for vapor deposition of columnar ZnO structures in the form of rods on various substrates without the need for substrate modification with catalyst seed particles and at relatively low temperatures compared to other vapor deposition methods. These structures are used for the photodegradation of stearic acid (C18H36O2) and the photoactivated detection of gases such as car...

Crystal structures of bovine heart cytochrome c oxidase in the fully oxidized, fully reduced, azide-bound, and carbon monoxide-bound states were determined at 2.30, 2.35, 2.9, and 2.8 angstrom resolution, respectively. An aspartate residue apart from the O2 reduction site exchanges its effective accessibility to the matrix aqueous phase for one to the cytosolic phase concomitantly with a signif...