Background and Objective: Due to the high potential of Hamedan city for agricultural products and subsequentlly effects of urban wastewaters and agricultural activities such as the use of fertilizers and chemical pesticides on soil quality, plant, and human health, performing this research was necessary. This research was done by purpose of investigating the effect of wastewater on accumulation of metals Pb and Cd in soil and vegetables. Method: For this purpose, sampling from soil and vegetables was performed randomly in the city of Hamedan. Sampling was done in an area irrigated with well water and in an area irrigated with wastewater. Vegetable Samples were prepared after washing and drying, powdered and prepared for experiment. Also soil samples after air-drying, sieve, and prepared for experiment. Then samples digested with acid mixture and heavy metals measured by Atomic Adsorption Spectroscopy (AAS). Finally obtained data were analyzed by SPSS 20. Findings: Results showed that wastewater had important effect on accumulation of Pb and Cd in soil and vegetables which means concentration of these metals in the soil and vegetables that was irrigated with wastewater was higher than those irrigated with well water. Also this is identified that the concentrations of Pb and Cd in studied vegetables was higher or equal to standards and Cd in the soil of both control and treatment were or equal to standards but Pb were lower than standards. Discussion and Conclusion: Since, in the treatment area, the mean concentration of Cd in scallion vegetable and mean concentration of Pb in leek vegetable is higher than standard. Therefore, in order to prevent creating problems for citizens’ health, irrigation of fields by wastewater must be prevented.

The objective of the present investigation is to codify a framework for the effectiveness of E-Learning programs of the work and technology course in the Islamic Republic system of Iran. The approach of the investigation is qualitative and the method used is grounded theory Strauss and J. Corbin (1994). The community of the investigation is experts of the domain of training and planning the new technologies and the work and technology course which 18 people of them were selected purposefully as samples. Open, axial and selective categorization techniques were used in order to analyze the data. Based on the results obtained, a matrix effectiveness framework of grounded, causal, inhibitor factors, strategies, and outcomes was formed such that the codification of a framework for the effectiveness of the e-learning programs as a comprehensive content included the mentioned factors. Each of these classes itself has various aspects in the basic contents. It is evident that the findings of the present investigation have made it possible to evaluate the effectiveness of the e-learning programs of the work and technology course in the Islamic Republic system of Iran.

The purpose of this research is Impact use of education model based on mobile learning environments on Social peresence and teaching peresence for Smart schools students in mathematical lesson. in this research goal, a combination research method was used. In this research we have been used some semi-experimental with pre-test and post-test design with control group. research statistical society are including all girl students are studying in Tehran Smart schools. For testing we have been used respected model volume with using of fast step cluster sampling way between Tehran Smart schools with suitable volume so that finally with pay attention to the resulted test decrease, 15 people have been settled in test group and 15 people in control group. Test group have been settled under provided education by researcher via mobile learning management system. That have been designed based on given model. For studying first and second we were used it by Multivaraite covariance analysis. Results was an indication of that using this sample at all dimensions of social and teaching presence in testing group had more increase than control group. Moreover, total score of social and teaching presence have been increased tangibly more than control group score on prosecution stage.