فهرست مطالب هدی جعفری زاده

In water applications, improper drainage systems increase the pollution of water resources. This study aimed to find an eco-friendly water disinfectant in the coagulation stage of drinking water treatment plants. In this study, iron oxide nanoparticles were synthesized by the co-precipitation method. The antibacterial activity of iron oxide nanoparticles was assessed on six important water-polluting bacteria (Escherichia coli, Enterococcus faecalis, Klebsiella pneumoniae, Pseudomonas aeruginosa, Bacillus cereus, and Staphylococcus aureus). The results showed that the highest effect of synthesized iron oxide nanoparticles with MIC< 0.07 μg/ml is against B. cereus and E. faecalis. In addition, iron oxide nanoparticles had antibacterial activity against Staphylococcus aureus with MIC= 0.3 μg/ml and in K. pneumoniae with MIC= 1.25 and P. aeruginosa and E. coli with MIC= 0.6 μg/ml. MBC results showed that iron oxide nanoparticles were to eliminate 99.9% of E. coli and S. aureus bacteria at a concentration of 1.25 μg/ml and K. pneumoniae at a concentration of 2.5 μg/ml. The obtained results show the antibacterial potential of nanoparticles for use in water treatment. It seems that the use of Fe3O4 nanoparticles as adsorbents in the water treatment process can be an efficient and economical alternative to disinfect water in the early stages of water treatment.

Skills training have been welcomed as employment training students and graduated of university students. This paper surveys ways to increase the skills of students while studying for entrepreneurship and job creation, through the design of skills training and internship in a new way. In this regard, the center of entrepreneurship and graduate students to enhance the professional competence of college students and graduates paid with the approach to meet the needs of the country's labor market for to the specialist staff of the national design workshop in a new way in cooperation with universities to provide a platform for increasing job satisfaction among alumni who will be attracted to the labor market and thereby increase entrepreneurship, productivity and profitability of the industry. With increasing student skills can increase entrepreneurship and job satisfaction. Nearly 1% of the professors and 3% of the students had a very good opinion of the old-fashioned internship, when they reached 20% and 25% in new way of internship, respectively