The conventional practice of using 0.45 or 0.40 microm membranes to distinguish between the particulate and dissolved phases in natural waters neglects the importance of colloids. Many of the colloids in natural waters pass through 0.45 or 0.40 microm membranes, but a significant fraction at the upper end of the colloidal particle size range is retained. Membrane clogging during filtration decr...

chronic kidney disease (ckd) is an increasing cause of morbidity and mortality worldwide. prospective data on risk factors for ckd are few. hypertension is one of the risk factors for ckd. in the past serum creatinine concentration was used as marker of kidney function but it proffers a late reflection of reduced glomerular filtration rate(gfr), which limits its ability to detect impaired kidne...

A device has been developed to increase and control the cell concentration in continuous culture fermentation reactors. This cell control device, used to study mixed culture methane fermentations, was developed because it is necessary to obtain cell concentrations much higher than can be obtained in a single stage reactor by adjustment of residence time or substrate concencentration. Designed a...

The present study aims at investigation of the performance of nanofibrous filter, containing magnesium oxide (MgO) nanoparticles, for bioaerosols removal from the air stream. It synthesizes two types of polyacrylonitrile (PAN) and PAN/MgO nanofibers via electrospinning technique, and investigates the antibacterial properties of the produced nanofibers through disk diffusion. The air containing ...

background : one of the most prevalent side effects of hemodialysis is intradialytic hypotension and its symptoms. using sodium profiles 3 and ultra filtration profile 3 and cold dialysate are the ways to overcome this problem. since none of these methods could control this complication lonely, this study was done to investigate the effect of combination of two methods on intradialytic hypotens...

A high performance KIER TYPE CYBAGFILTER that combines a fabric filtration and centrifugal dust removal technologies was developed to maintain high performance of the existing bag filter. Based on the performance results obtained from a pilot-scale test unit and fluid dynamics computer simulation, a test CYBAGFILTER of 18,000m3/hr capacity was installed in the clinker calcination process of Yon...

This study evaluated the performance of aluminum-copper alloy filtration, without the original aluminum filter, for dental radiography in terms of x-ray energy spectrum, air kerma rate and image quality. Comparisons of various thicknesses of aluminum-copper alloy in three different percentages were made with aluminum filtration. Tests were conducted on an intra-oral dental x-ray machine and wer...

The procedure currently used for isolating legionellae from environmental samples recommend filtration through a 0.2-microns-pore-size polycarbonate filter. In this study we evaluated the performance of 23 other filters composed of various materials and having various pore sizes. We prefer the 0.2-micron-pore-size Gelman Supor filter because of its high level of recovery, faster filtration rate...

Over the past decades, industrial sector has been trying to improve use of resources and environmental impact they create. Significant work done in compressed air systems. However, there is still much room for improvement. The focus this study on a new approach energy efficient filtration. This involves installation different filter configurations that enable lower pressure drop, instead conven...