zno and zno: mn nanocrystals were synthesized via reverse micelle method. the structural properties of nanocrystals were investigated by xrd. the xrd results indicated that the synthesized nanocrystals had a pure wurtzite (hexagonal phase) structure. resistive gas sensors were fabricated by providing ohmic contacts on the tablet obtained from compressed nanocrystals powder and the installation ...

It is shown that the radio and gamma-ray emission observed from newly-found “GeV-bright" supernova remnants (SNRs) can be explained by a model, in which a shocked cloud and shock-accelerated cosmic rays (CRs) frozen in it are simultaneously compressed by the supernova blastwave as a result of formation of a radiative cloud shock. Simple reacceleration of pre-existing CRs is generally sufficient...

the hcci combustion process is initiated due to auto-ignition of fuel/air mixture which is dominated by chemical kinetics and therefore fuel composition has a significant effect on engine operation and a detailed reaction mechanism is essential to analysis hcci combustion. a single zone-model permits to have a detailed chemical kinetics modeling for practical fuels. in this study a single-zone ...

natural gas is often associated with nitrogen and heavy compounds. the heavy components in the natural gas not only can feed downstream units, owing to the low temperature process may be formed solid as well. therefore, heavy components separation can be a necessity and produce useful products. virtually, all natural gases are containing nitrogen ​​that would lower the heating value of natural ...

During the inflation phase of intermittent positive pressure ventilation gas is compressed in the tubes and connections between the valves of the ventilator and the patient. In machines where the valves are an integral part of the mechanism of the ventilator, and are therefore situated at some distance from the patient, the volume of gas compressed in the collecting tubes may be appreciable. Th...

The elasticity mixed boundary values problems dealing with half-space contact are generally well resolved. A large number of these solutions are obtained by using the integral transformation method and methods based the integral equations. However, the problems of finite layer thicknesses are less investigated, despite their practical interests. This study resolves a quasi-stationary problem of...

Rupture of the esophageal wall is most commonly iatrogenic. Boerhaave’s syndrome refers to spontaneous esophageal perforation that occurs because of retching or vomiting. Spontaneous perforation of the esophagus results from a sudden increase in intraesophageal pressure combined with relatively a negative intrathoracic pressure. We report a case of esophageal rupture in a young patient caused b...