In order to study the influence of loading conditions on propellant mesoscopic failure morphology, scanning electron microscopy was carried out observe morphology section a hydroxyl-terminated polybutadiene under different temperatures, speeds, and conditions. Using finite element method, model composite solid constructed, mechanical parameters particle–matrix interface were obtained based para...

Legionella is an opportunistic pathogen with a biphasic life cycle that occasionally infects humans. The aim of the study was to assess distribution virulence genes and genetic diversity among L. pneumophila isolated from water supply systems residential buildings in Latvia. In total, 492 samples 200 were collected. Identification spp. performed according ISO 11731, 58 isolates subjected whole-...

The addition of aluminum (Al) to the fuel is an effective way increase regression rate hybrid rocket motors (HRMs). Due its high rate, impact combustion surface on performance HRMs cannot be ignored. Therefore, it significant establish a dynamic numerical simulation model predict HRMs. In this study, was established based mesh technology and verified by firing test. results show that agree well...