جستجوی مقالات مرتبط با کلیدواژه « هیبرید » در نشریات گروه « پزشکی »

As for the enhancement of the various industries such as loom industry, the reduction of the pollutants in the sewerage of these industries is focused by protection office of environment. Therefore, the main aim of this research is the elimination of the methyl orange from water using photocatalytic procedure and ZnO nanoparticles.
The kinetic of the photocatalytic oxidation reaction of methyl orange using ZnO nanoparticles and hybrids containing decorated Multi Wall Carbon Nanotubes (MWCNT) with ZnO nanoparticles is investigated. The influence of irradiation time (from 5 to 30 min) and the concentration of the photo catalysts (0.1, 0.2 and 0.5 %wt) on the kinetic reaction of methyl orange decomposition is studied.
The kinetic reaction of methyl orange decomposition using ZnO nanoparticles and synthesized hybrids is pseudo first order. The reaction rate constant using ZnO nanoparticles is lower than that of studied hybrids. This means that the reaction rate of methyl orange decomposition using ZnO nanoparticles is low. Meanwhile, according to the results it can observe that the attachment of the ZnO nanoparticleson the outer surface of MWCNTs leads to the enhancement of the reaction rate. Also, the reaction rate of pollutants decomposition increases with respect to the attached ZnO nanoparticles on the outer surface of MWCNTs.
Based on the observed results, the introducing and enhancement of the ZnO nanoparticles on the outer surface of MWCNTs leads to the augmentation of the methyl orange decomposition rate. Therefore, according to this technique the decomposition of the pollutants accelerates.

Flowable composite is an appropriate choice for repairing old composite restorations because of its conservative nature, easy application and various colors available on the market. The aim of this study was to evaluate the shear bond strength between old hybrid and new flowable composite resins using Adhes, Single bond, Prompt L Pop and no dentin bonding agents. Eighty acrylic cylinders were fabricated with a standard cavity in the center. Tetric Ceram hybrid composite was placed in the cavities and cured. The cylinders were divided into two groups one group was kept in water for one month and was then randomly divided into four subgroups. Dentin bonding agents were not used in the first subgroup but the selected bonding agents were applied to the cylinders in the other subgroups. Tetric Flow composite was placed on the primary composite. The same procedure was used for the second group except that the samples were not stored in water for one month. The shear bond strength was measured using a universal testing machine. The data were subjected to LSD variance and independent t-analysis. Shear bond strength values ranged from 33.27 to 16.62 MPa in the first group (in decreasing order: Adhes, Single-bond, control and Prompt L pop subgroups) and from 32.73 to 18.15 MPa in the second group (in decreasing order: Adhes, Single-bond, Prompt–L–pop and control subgroups). In the first group, a significant difference was observed between the control versus Adhes and control versus Single bond subgroups and also between the Adhes and Prompt L pop and finally between the single bond and Prompt L pop subgroups. There was no significant difference between the control versus Prompt L pop and Adhes versus Single-bond subgroups. The results obtained in the 2nd group were similar to the first group. The shear bond strength between aged hybrid and new flowable composite resin may increase after application of dentin bonding agents.