فهرست مطالب m .moazami

We have investigated the shape evolution and shape coexistence in the even-even neutron-rich isotopes of Yb, Hf, W, Os, and Pt and the isotones N = 110-122 in the A~190 within the microscopic-macroscopic Cranked Nilsson-Strutinsky framework. Here, we have focused on the potential energy surface (PES) calculations to detect shape variations with N and Z. The PESs in the ground state for low-lying energy show the presence of collective and non-collective bands. The results are comparable to the studies of others where the pairing correlation was also included. Deformation changes in the isotopic and isotonic chains with increasing the neutron and proton number and the filling of closed shells. The qualitative consistency of our calculations without pairing correlations, especially on the position of the PES's minima, shows that the pairing force has no considerable effect on the nuclear shape, at least in the mass region A~190.

Construction projects in the oil and gas sector require a heavy budget and a long construction time. As construction projects become larger and more complex, new planning methods are needed. The use of traditional planning methods for project management has not been responsive, and most projects face problems such as widespread delays, cost overruns, rework, wastage, and inadequate resource utilization. One of the challenges of oil and gas projects is the issue of delay and inadeqate resource utilization. Traditional planning techniques such as Critical Path Planning or PERT do not meet all linear projects' requirements. Planning for construction projects is often performed in a critical manner. In this way, the impact of resources and machinery is not well understood, and the uncertain nature of construction projects is not applied. In linear projects, similar activities are repeated in different positions. Pipeline construction projects require effective planning to ensure maximum utilization of resources and reduce time outage due to the constant movement of resources and machinery. Completing projects at a specified cost and time requires proper planning that the project can deliver on time. The current research introduces a framework to improve gas pipeline project planning using modern computer tools such as construction simulation. This framework aims to examine the impact of the number of resources on the project process, estimate realistic project duration, increase resource productivity, carefully evaluate construction operations, and ultimately reduce project time and cost. This framework would enable project employers and contractors to have greater flexibility in planning discussions and increase their supervisory capacity. The framework is presented in collaboration with the Iranian Gas Engineering and Development Company in the form of a case study of the Dehgolan to Miandoab gas transmission pipeline.

Nowadays on the one hand improving the performance of asphalt mixtures is a necessity and on the other hand disposal of steel slag and plastic containers causes serious environmental problems. Therefore, in this study the effect of two waste materials on enhancing creep performance of Stone Mastic Asphalt (SMA) mixture was investigated; In order to thoroughly investigate the impact of Polyethylene terephthalate (PET) modification, specimens with three percentages of PET (3,5 and 7) in two forms (PET particles and PET fibers) were prepared. It was found that cumulative permanent strain was the lowest for specimens modified with 5 percent PET followed by 7 and 3 percent, respectively; Furthermore, adding PET in the form of fiber is more effective. With increase in stress and temperature, differences between creep performance of modified and unmodified samples were more prone. Based on average damage ratios, slag samples with 5 percent PET fiber (S-5P-F) were 70 percent less damaging.

Genetically modified products have been the site of controversy over the last two decades. The main objective of this study is to examine these claims and identify the claim makers that raise these claims.  This is a qualitative case study and data has been collected from three sources: interview with key actors in the field, the contents of three debates among the claim-makers and specialized and non-specialized texts related to the field. Research findings show two networks have been formed around genetically modified products. Each network consists of different groups and actors with a common view about genetically modified products. Network of proponents frame genetically modified products as food security, clean environment, healthy food and national production. The network of opponents frames them as risks to environment and human health and a scheme for the intrusion and manipulation of the agricultural system particularly in developing countries. The dominance of a group of frames has different consequences for society.

The aim of the present study was to investigate the potential consequences of using the internet on students’ educational status regarding their motivation and improvement of qualitative and quantitative dimensions of their education. The statistical population included all secondary school students of Tehran that totaled to 382000. Out of this number, 384 individuals were taken as the sample of the study by using Morgan’s table. The instrument of data collection was a researcher-made questionnaire including Young’s addiction questionnaire items to measure respondents’ addiction to the internet. Validity of the instrument was confirmed by experts. In order to measure the reliability, the questionnaire was piloted among 30 respondents which led to a Cronbach’s alpha index of 0.78. After the administration of the questionnaire to the study sample, statistical analyses were conducted by using one-way ANOVA and t-test. Results indicated that 63 percent of students were internet users while 37 percent were not. Also, pastime did not have any effect on students’ educational status and no relationship was observed between them. Additionally, internet users had a worsened educational condition (p= 0.51). Finally, Young’s addiction test demonstrated that about 64 percent of the students were normal, 27 percent were at the verge of addiction, and 7 percent were addicted to using the internet.