A 48-year-old male with a history of benign nephrosclerosis and chronic haemodialysis for the last 6 years was admitted to our hospital. He was diagnosed with left radial arteriovenous fistula thrombosis. The right internal jugular vein (RIJV) was thrombosed (history of RIJV catheter) as confirmed by Doppler echography. A Dual-Cath (Medcomp) was inserted in the left jugular vein without complic...

The paper presents the results of a Computational Fluid Dynamics (CFD) study undertaken to upgrading the hydraulic efficiency of the contact tank of the wastewater treatment plant of Nola-Marigliano, near Napoli. First numerical simulations were performed to compare the hydraulic performances of two existing operating schemes (A and B). The results pointed out the presence of recirculation area...

Flow through mixed flow compressor stage was evaluated theoretically to understand internal flow behaviour. Various shroud configurations in terms of clearance has been considered to see the effect of clearance on compressor performance. The blade to blade relative flow variation from impeller inlet to outlet was evaluated through theoretical analysis. A 3D viscous commercial code Fluent was us...

Abstract: Nonlinear model predictive controllers based on neural networks are implemented in this paper to regulate the activated-sludge process. The simulation protocol BSM1 is used to apply the predictive controller schemes and study the closed loop process behavior in different situations. Also input-output data are gathered from the benchmark for the neural networks training. Control result...

In order to comply with the increasingly tough emission standards worldwide, engine manufacturers are forced not only to substantially reduce emissions of particulate matter (PM), but also emissions of nitrogen oxides. The main approach pursued by MTU is low-emission combustion, in other words an internal engine solution. However, this means taking into account a basic principle that governs th...

We explored the temporal and topographic relations between local cerebral blood flow and regional brain prostaglandin profile following prolonged or transient occlusion of the middle cerebral artery in cats. Each experimental group was subjected to a sham operation, prolonged ischemia, or recirculation. Local cerebral blood flow was measured by the hydrogen clearance method. Following in situ f...

Recirculation systems create unique environments for fish culture. Opportunistic microorganisms may cause disease due to favorable conditions occurring in recirculation systems. The biofilters used may become reservoirs of infectious microorganisms. Stressful conditions such as suspended solids in culture tanks and high rearing densities may contribute to disease outbreaks. Additionally, noninf...

The effect of recirculation in increasing organic loading rate (OLR) and decreasing hydraulic retention time (HRT) in a semi-continuous two-stage anaerobic digestion system using stirred tank reactor (CSTR) and an upflow anaerobic sludge bed (UASB) was evaluated. Two-parallel processes were in operation for 100 days, one with recirculation (closed system) and the other without recirculation (op...

Whether the calcium entry blocker, nimodipine, prevents the increase in the concentration of free fatty acids and metabolic disturbances during ischemia and promotes functional and metabolic recovery after recirculation were examined. Severe forebrain ischemia in rats was induced by four-vessel occlusion with mild hypotension. After 30 minutes of ischemia, recirculation was started by removal o...

A microbial fluidized electrode electrolysis cell (MFEEC) was used to enhance hydrogen gas production from dissolved organic matter. Flowable granular activated carbon (GAC) particles were used to provide additional surface area for growth of exoelectrogenic bacteria. The use of this exoelectrogenic biofilm on the GAC particles with fluidization produced higher current densities and hydrogen ga...