A hydrophobic-bentonite catalyst (cetyltrimethyl ammonium bromide-bentonite) has been used as a very mild, neutral, eco-friendly, reusable, non-toxic, low-cost and easily available catalyst. It was prepared by replacing the exchangeable Na+ cations of a homoionic Na–bentonite with cetyltrimethyl ammonium bromide (CTMAB) cations. The catalyst was characterized by XRD, BET and SEM. The...

A hydrophobic-bentonite catalyst (cetyltrimethyl ammonium bromide-bentonite) has been used as a very mild, neutral, eco-friendly, reusable, non-toxic, low-cost and easily available catalyst. It was prepared by replacing the exchangeable Na+ cations of a homoionic Na–bentonite with cetyltrimethyl ammonium bromide (CTMAB) cations. The catalyst was characterized by XRD, BET and SEM. The...

background: identify the optimal technique of radiotherapy for patients with high grade glioma. our initial year of experience with rapidarc radiation therapy. materials and methods: planning ct scans of 50 patients with grade iv glioma were reviewed and three plan sets by 3d conformal radiotherapy (3dcrt), intensity modulated radiotherapy (imrt) and rapid arc (ra) were generated and the plans ...

Deep mining has started in the Huaibei area, and serious threat of high confined water on floor to coal seam is gradually increasing. Based deep project at working face II633 Hengyuan mine, this paper theoretically analyzes damage depth risk inrush from floor. The best proportion grouting materials was quantitatively optimized by indoor experiments, an industrial field test conducted judge effe...

Hypernatremic dehydration is an important cause of intracranial hemorrhage. A possible association of intraventricular hemorrhage (IVH) with hypernatremia and/or high sodium intake has been suggested in preterm infants. To investigate the associations of early fluid and sodium intake or serum sodium concentrations with severe intraventricular hemorrhage (IVH) in extremely low birth weight (ELBW...

The present work aims to investigate the effect of sulphanilamide (SA) adsorption on the zeta potential and water loss of raw local bentonite (B) and Na-bentonite (Na-B) suspensions. This was accomplished by separating the fine particles of raw bentonite of size (< 1μm), then activating them by Na+ ions. Adsorption isotherms of SA on B and Na-B were obtained at different SA concentrations rangi...

Bentonite is a natural and finite mineral resource. Dilute suspensions of sodium montmorillonite clay in water represents bentonite slurries. Suspension orientation colloidal particles define rheological properties slurry (BS). The BS has been used about seventy years to temporarily support the excavations. More recently, polymer fluids (PSF) gained much popularity are widely compared fluids. P...

objective: to evaluate the efficacy of modified perihepatic packing (mphp) in reducing the rate of re-bleeding rate after packing removal. methods: this was an experimental study being performed in shiraz animal laboratory. high grade liver parenchymal injury was induced in 30 transgenic australian rabbits which were then divided into two groups. group a (control) included 14 and group b (exper...