Shot peening beneficial effects on fatigue life of mechanical components are well known. However, there are some reports in the literature that indicate inappropriate shot peening parameters tend to reduce the fatigue life. It is therefore, the purpose of this study to find a logical quantitative justification for these observations. Using finite element method, a dynamic elastic-plastic simula...

In this study biomass acclimation in a side stream partial nitrification sequencing batch reactor (SBR) was performed under optimum conditions (T 30ºC, SRT 9± 1 days and hydraulic retention time (HRT) 1.2 day). Excess sludge for solids retention time (SRT) regulation was added to another batch reactor (main stream) which performed under different conditions for partial nitrification evaluation ...

This paper presents a low-frequency square-wave drive, consisting of a single high voltage converter, an ac lamp ignition circuit, current control devices and a single backlight controller, capable of driving an arbitrary number of parallel cold cathode fluorescent lamps (CCFLs) with independent accurate lamp current regulation. Key to the architecture is a proposed capacitive coupling approach...

The search for new and improvement of existing technical design energy converter systems specific consumers requires a reasonable choice the most rational these objects. Thermotransformers that operate on reverse mixed thermodynamic cycles, in combination with power plants utilizing renewable non-traditional primary (fuel), are considered to be interest small-scale generation (trigeneration sys...

Low-pressure cold spraying has gained much significance for its good economy in recent years. However, compared with high-pressure spraying, the unsatisfactory performance of coatings prepared by this method is a key problem restricting further development. To improve properties coating without incorporating severe conditions, paper proposed an original shot-peening-assisted low-pressure cold-s...

Nitrogen N , phosphorus P , and carbon C flux through a three pond wastewater stabilization system WWSP was measured over the course of a year in a cold weather region Minnesota with 4 months of ice cover. The system was surprisingly efficient at N removal averaging 80% primarily through volatilization of un-ionized ammonia during the late spring when the pH was above 8 and ammonia levels were ...

Context. Even though high-mass stars are crucial for understanding a diversity of processes within our galaxy and beyond, their formation and initial conditions are still poorly constrained. Aims. We want to understand the kinematic and thermal properties of young massive gas clumps prior to and at the earliest evolutionary stages of high-mass star formation. Do we find signatures of gravitatio...

Mine and mill effluents often contain appreciable quantities of ammonia. The discharge of effluents containing ammonia to aquatic systems can have significant environmental effects because ammonia is toxic to fish and other organisms. The Rotating Biological Contactor (RBC) technology has been in use for several years for the treatment of municipal and industrial wastewater. This study evaluate...