zahra zareei

In this study, we tried to present an efficient method for removal of Reactive red 241 (RR241) from aqueous media, using a modified carbon composite with GO sheets. The prepared nanocomposites were then charcterizded by commonly identical techniques involve FESEM, BET and FT-IR. In removal studies, various parameters affecting the adsorption process including pH, time, adsorbent dose, temperature as well as the amount of GO in the constraction of composite were studied by respond surface method. The optimum conditions for removal of 100 mg/L of dye was pH of 5.0, time of 75 minutes and the adsorbent dose of 1.47 g/L containing 4.15 wt.% of GO. The maximum removal of 96% was also achieved under optimum conditions. Experiments showed that the adsorption was more consistent with the Langmuir equations and the maximum adsorption under this model was 160 mg/g. The results of the removal experiments showed that the amount of the adsorbent, GO content and pH had a significant effect on RR241 removal. BET analysis indicated that the addition of GO to the carbon composite structure improved the pore size, total pore volume, and effective surface area of the composite. Also, isotherms, kinetics and thermodynamic studies of adsorption were depicted that Langmuir isotherm model, pseudo-second-order kinetic model and self-adsorption are suitable models for RR241dye adsorption.

artificial airway lead to weakened cough reflex and the loss of ciliated cells eventually that finaly lead to accumulation of secretions so patients need periodic suction. This study aimed to compare the effect of open suction endotracheal tube using two different size suction catheter on the arterial blood oxygen saturation in critical care patients were admitted.
In this clinical trial 36 patients in one group and under suction catheter with two size 12 and 14, respectively. Changes in blood oxygen saturation before, during, after 5 minutes and 20 minutes after suctioning was recorded. For Oxygen saturation suction compare changes in different stages, analysis with variance and repeated measures was used.
The results showed that oxygen saturation during small suction catheter is a significant difference (p=0/000). In addition to suction the blood oxygen saturation rate in the first episode there is a significant difference (p=0/000). 5 minutes after suctioning blood oxygen saturation in compare of 5 minutes before the suction has no significant difference (p=0/597) but blood oxygen saturation 20 minutes after suction in compare of 5 minutes prior to suctioning and suctioning episodes were significantly different(p=0/050).
Since the fall endotracheal suctioning of arterial blood oxygen saturation and the reduction in the episodes become more frequent suctioning, it is recommended to reduce the duration of suction.

Globalization is a concept embedding social, political, and economic dimensions, which have been summarized by Mac. Luhan in the compression of time and place in to human affairs. The main objective of this study is to analyze the management of human resources, and the impacts of globalization on it. The research methodology is descriptive, and analytical. In this research no special tool of that kind which is used in field research was used.However; some forms were used for collecting information, and making conclusion on the basis of related studies. Whereas, the data of the research were qualitative, qualitative analysis was used for analyzing and concluding.The collections and findings of human resources are categorized beneath management in its general meaning, and its objective is to manage personnel to reach competitive status. Regarding the impacts of globalization on the activities and processes of human resources management, we have to outline the acceleration of activities and process of human resources by using electronic system of human resources management, incorporation of multinational companies, etc.