فهرست مطالب ali torki

One of the latest innovations in nano-technology is the use of Micro-Nano Air Bubbles (MINAB) as a substitute for water in concrete. Using MINAB as a substitute for water used in concrete can be used to improve the properties of concrete. The use of super- Plasticizer can have an effective role in reducing negative effects MINAB on concrete properties. In this study, to investigate the effects of MINAB with water in concrete in the presence of different super- Plasticizer percentages, the effect of MINAB on the setting time, cement mortar flow and compressive strength of cement mortar is investigated. For this purpose, 16 samples of VICT needles, 48 samples of cement mortar and 16 samples of cement mortar flow were used to check the curing time, compressive strength and cement flow with different percentages of super- Plasticizer (0.5, 0.9 and 1.4) were tested in the presence and absence of MINAB. The results showed that the compressive strength of cement mortar with MINAB increased by 16 and 7%, relative to water at 7 and 28 days respectively. The compressive strength of cement mortar with MINAB has increased in presence of super- Plasticizer in comparison to cement mortar with water in presence of super- Plasticizer at the age of 7 and 28 days, with the highest resistance in 0.5% super- Plasticizer, which increased by 21% at 7 days and increased by 10% at the age of 28.

This study tries to evaluate the servant organization based on OLA model in the form of a case study in Bank Melli Iran branches in Arak. For this purpose، a number of 91 individuals were selected from among the employees of the Bank Melli Iran branches throughout the city in Arak via stratified random sampling. The data were collected using OLA instrument، and later analyzed by means of parametric Student T-test and one-way ANOVA. The findings showed that the characteristics of servant organization in Arak branches of Bank Melli Iran were above the average and regarded as satisfactory. Meanwhile، one-side variance analysis of servant organization characteristics illustrated no significant relationship between age and education level in Arak branches of Bank Melli Iran.

This study aimed at "Investigation of employee’s perception of servant leadership of the organization and it’s relationship with the job satisfaction of the employees in Bank Melli Arak branch". For this purpose, 91 employees were selected from the Bank Melli Arak branch by stratified random sampling. The data were collected using OLA instrument and a job satisfaction questionnaire validated for bank employees. The data were analyzed using Pearson correlation, t-test, stepwise multi-regression and one-way ANOVA. The findings showed that servant leadership in Bank Melli Arak branch and the employee’s job satisfaction were both above the mean and satisfactory. there was significant positive correlation between servant leadership of the organization and employee’s job satisfaction(r = 0.58, p < 0.01). Stepwise regression analysis indicated that among the factors of servant leadership, provision of leadership was the strongest predictor of employees’ job satisfaction and could predict %35 of the variance related to employee’s job satisfaction (F=49.31, p<0.01). Also, in assessing the characteristics of servant leadership and employee’s job satisfaction, there was no significant difference in age and academic level.