chelating resins based on polyacrylonitrile and diethylenetriamine (pan-dta) wereprepared through the simple reaction of polyacrylonitrile with various volume percents ofdiethylenetriamine (dta), (25, 50, 75 and 100). the prepared resins were applied to removeheavy metal ions such as cu(ii), zn(ii) and cd(ii) from aqueous solutions. the sorptionbehaviors of the resins for these metal ions were ...

Composite resins were reinforced with glass and polyethylene fibers in this study, and the effect of fiber reinforcement on the color change of composite resins was investigated. After accelerated aging, the effect of fiber reinforcement on the color stability of composite resins was also examined. There were three experimental groups (n=12 disks per group): non-fiber-reinforced composite (non-...

We apply a cubic-plus-association equation of state to study the asphaltene precipitation from n-alkane diluted model solutions (asphalteneþtoluene), and heavy oils and bitumens. Heavy oils and bitumens are characterized in terms of saturates, aromatics/resins, and asphaltenes; n-alkanes are treated independently. The asphaltene precipitation is modeled as liquid-liquid phase equilibrium. The s...

The performance of MabSelect SuRe and IgSelect affinity chromatography resins designed for process-scale purification of antibodies was investigated. Various antibodies (4 human monoclonal, 1 human polyclonal and 1 bovine polyclonal antibody and 1 Fc-fusion protein) were used to evaluate the elution pH and dynamic binding capacity of the resins. The elution pH for each human antibody was simila...

The purpose of this study was to evaluate the effect of degradation of a denture base resin on bond strength to relining resins. Denture base resin specimens were immersed under various conditions to simulate degradation. Tensile bond strength of denture base resin after immersion to relining resins was measured with or without surface grinding. The bond strength of denture base resin without g...

Reline of ill-fitting complete and removable partial dentures enhances their stability and retention by improving the adaptation between the denture intaglio surface and denture-bearing mucosa1). In clinical situations, that reline procedure is usually performed using a direct (chair-side reline system) rather than indirect (laboratory-processed reline system) method, because the former is more...

The aims of the present study are to investigate: (1) the effect of using a hearing aid (HA) or a second cochlear implant (2nd CI) on speech recognition in noise for children; (2) the ability to perceive phoneme groups of different frequencies when using a CI and an HA in opposite ears (bimodal fitting) and when using a CI in each ear (bilateral implant fitting), and (3) the relationship betwee...

Treatment and disposal of waste radioactive ion exchange resins is one of the most urgent problems for nuclear industries in China. Cement solidification technology has many advantages, such as requiring simple equipment, easy scaling-up, low working temperature, no trouble of gas cleaning and low cost. It is a suitable technology for treatment of waste radioactive resins, and has been widely u...