Abstract The alloy 2.25Cr-1Mo-0.25V is commonly used for heavy wall pressure vessels in the petrochemical industry, such as hydrogen reactors. As these reactors are operated at elevated temperatures and high pressures, welding consumables require a beneficial combination of strength toughness well enhanced creep properties. mechanical properties known to be influenced by several parameters. Thi...

A study was performed to elucidate the mechanisms of extinction and autoignition of n-heptane in strained laminar flows under non-premixed conditions. A previously developed detailed mechanism made up of 2540 reversible elementary reactions among 556 species was the starting point for the study. The detailed mechanism was previously used to calculate ignition delay times in homogeneous reactors...

Polycyclic aromatic hydrocarbons (PAH) are regarded as environmental pollutants. A promising approach to reduce PAH pollution is based on the implementation of the natural potential of some microorganisms to utilize hydrocarbons. In this study Proteiniphilum acetatigenes was used for bioaugmentation of sewage sludge to improve the PAH removal. Bioaugmentation experiments were performed in paral...

Several hydrogenation reactions involving O-debenzylations, aromatic nitro group reductions and reductive dethionations were investigated under continuous flow conditions in a novel, laboratory scale hydrogenation device that combines endogeneous hydrogen generation and heterogeneous Pd/C or Raney-Ni catalyst cartridges. The hydrogenation of organic compounds through addition and/or hydrogenoly...

Cyclosporin A (CyA) is found as an antibiotics, exhibiting immunosuppressive and antifungal properties. Cyclosporine A has been synthesized in large quantities by fermentation process using various fungal species such as Tolypocladium, Trichoderma, Fusarium Penicillium and Aspergillus spp. Submerged liquid fermentation (SLF) and solid state fermentation (SSF) have been used successfully to prod...

background: natural methods of wastewater treatment, such as wetlands, are simple, cheap and acceptable for developing countries, especially small and remote cities. the aim of this study was to evaluate the efficiency of typha latifolica in subsurface flow constructed wetland for wastewater treatment. methods: in this experimental research, the efficiency of typha latifolica in subsurface flow...

in river meandering, when flow passes through a bend, reduction of flow velocity and rising hydrostatic pressure cause super elevation phenomena at outer side and reduction of water surface at inner-side of the bend. a helical motion results, causing erosion of the outer side of the bend. installation of submerged vanes on the stream bed can reduce erosion of the outer bank significantly. in th...