a b s t r a c tMagnetite nanoparticles with a size distribution of 15-21 nm were synthesized and decorated onto surface of graphene oxide by ultrasound assisted precipitation. Size and size distribution of the obtained M-GO hybrid were appreciably finer than the hybrids prepared by stirring method. M-GO is a superparamagnetic material with saturation magnetization of 31 emu g −1 . The Langevin equation was successfully applied for estimation of size of Fe 3 O 4 nanoparticles in M-GO hybrid, with maximum error of 17.5%. The study put forward a formation mechanism for M-GO, based on instrumental analyses. Adsorption isotherms of Sr 2+ and Co 2+ ions, which were fitted by Langmuir monolayer model, displayed two-fold higher capacity for Co 2+ ions, presumably due to its similarity to Fe 2+ (of Fe 3 O 4 component). Uptake of both Co 2+ and Sr 2+ ions were endothermic, and spontaneous, however the former proceeded through inner-shell complex formation, while the latter took place via ion exchange mechanism. Rate of adsorption of Co 2+ was faster, but for both ions, chemical reaction was the rate determining step. Sorption of Sr 2+ and Co 2+ ions greatly increased at pHs above 5, where (1) surface zeta potential changed its sign, and (2) deprotonating reactions at the surface became complete.

In vivo positive contrast MRI by magnetite/dextran-functionalized graphene oxide (SPIO-Dex-FGO) as compared to Magnevist® (the right rat).

Soil is a living, dynamic and non-renewable source in lifetime which is vital for food production and the global balance of ecosystems. Every year more than 75 billion tons of soil erodes from the surface of earth. Taking care for this, appropriate methods needed to prevent erosion and sediment movement, which in its turn requires the presence of information about erosion intensity in the basin. Lack of statistical data and information on soil erosion and sediment production in Zemkan basin located in the West of Kermanshah Province, is an issue that paved the way to carry out this study with the aim of identification of erosion rate and sedimentation production and exploring sensitive areas of erosion. To achieve the above-mentioned aim, there was used the erosion potential method (EPM) using of geographical information system (GIS) to reduce errors and increase the relative accuracy in the analysis of the model. Required data in this study were prepared through field observations, existing maps, statistics of meteorological and hydrometric stations and library resources. After inputting maps into the ArcGIS software environment and geo-referencing them, required layer was digitized and there created database for them. Finally, using standard tables provided in the EPM model, accordant values for the basin extracted and incorporated into the layers according to the relations given in EPM model, map of erosion intensity zoning, erosion and sediment ratio calculated for the basin. Results showed that the rates of especial erosion (WSP) and especial sediment are (GSP), 2742.02 and 1005.55 m3/Km2/y respectively. Class and intensity of erodibility of basin were also identified as very intensive (V). Therefore, different policies of erosion control in the basin are necessary.

No abstract

Objective: Depression and anxiety are common in children and a major cause of many illnesses and disabilities in this age group; Moreover, parents have the greatest impact on shaping the mental health and well-being of their children and there is a vast literature describing the importance of parenting factors in the development of depression and anxiety in children. Methods: We used the experimental research design in this study. The sample consisted of 34 children with depression and anxiety who were randomly allocated into ACT on parenting (intervention) and control groups via the randomization method. The intervention group received eight 2-h sessions weekly. The revised child anxiety and depression scale, parent short versions and the self-compassion scale were administered in both groups. The analyses of covariance (ANCOVA) and the repeated measures of analysis of variance (ANOVA) were employed to determine the difference between the intervention and control groups on depression, anxiety, and self-compassion. Results: ANCOVA and repeated measures ANOVA results showed clinically significant changes in depression and anxiety in children and self-compassion in parents in the intervention group (P<0.001). The Mean±SD of depression in the intervention group was 16.50±0.89 at baseline, which significantly decreased to 2.94±3.27 at post-measure and 2.25±3.35 at follow-up (P<0.001). The Mean±SD of anxiety was 18.19±1.87, which significantly decreased to 7.63±4.34 at post-measure and 7.06±4.52 at follow-up (P<0.001). Additionally, the mean and SD score of self-compassion was 56.43±3.14 in pre-intervention, which significantly improved to 97.18±3.72 in post-intervention and 98.25±4.76 at follow-up (P<0.001). Conclusion: The results show that ACT-based parenting is an effective treatment for depression and anxiety in children. This method also improves self-compassion in parents.