Sharif Digital Repository

Aqueous environment with vegetation in coastal areas plays important role in ecologic systems. The plants in aqueous environment caused to vertical and lateral changes of flow velocity profile. When sunlight penetrates the water, it will turns into heat energy. The plants caused to blocking the light path, to make a difference in temperature and thus the density differences on the horizon. This density gradient will lead to the gravity flow. Due to the observations, in coastal wetlands, beside the plants the emerged from the water, there are some completely submerged plants that their root in the soil and shallow layer of fluid covered on them. This study to approaching the conditions, is... 

Performance based design was first introduced in order to evaluate seismic vulnerability of structures in retrofitting topic and was rapidly implemented in new design codes. The main cause conducting widely developing of performance based design methods, has been accurate estimation of seismic demand parameters. Since seismic structural members displacement during earthquake has a direct effect on the amount of sustained damages, displacement index has always been a key concept in performance based design. The main goal followed by this research is comparing the results obtained from the standard pushover method (with two theorems of distributed plasticity and plastic hinges) and the... 

One of the most important criteria in travel analysis is the vehicle kilometer traveled (VKT). The distance which personal cars, vans or other automobiles travel is measured through this criterion. In addition, the VKT is used in transportation planning, accident analysis, transportation budgets assignment, and estimation of automobile pollutions. In this work we process origin-destination data gathered in Shiraz, Iran to estimate the VKT. To this end, we incorporate the linear regression and geographically weighted regression (GWR) methods. Through this research, data from origin-destination statistics of Shiraz, gathered by the transportation institute of Sharif University of Technology in... 

Polymeric film for packaging applications are commonly made from a variety of polyethylenes using a blown film process. Nowadays high density polyethylene with bimodal molecular weight distributions are used to improve the performance and the final properties. In the present study samples with different bimodal molecular weight distribution in a similar film preparation are developed. The EX5 sample from the Jam Petrochemical showed microstructure with heavily oriented stack of lamellae in the machine direction. In contrast, the 7000F sample from the Mehr Petrochemical presented a microstructure with a lower degree of lamellae, containing lamella twist and more link between the crystalline... 

The soil-water retention curves (SWRC) is an unsaturated soil mechanics hydro chemical state surface, which expresses the relationship between the soil suction and water content. The soil-water retention curve could describe the water adsorption and desorption process that happened in soils. The difference between the desorption or drying retention curve and the adsorption or wetting retention curves in a specific soil specimen indicates the hydraulic hysteresis phenomenon. Generally, the amount of water remaining in the drying process is greater than the amount of water adsorbed in the wetting process at a certain amount of suction. Suction due to the combined effects of capillary and... 

In much of the financial economics literature, banks are modeled as financial intermediaries that transfer household deposits to loan applicants. In these models, deposits are obtained from the accumulation of real amounts (household savings). In addition to this, another approach describes banks not as intermediaries of loanable funds, but as money-creators who do not need to accumulate deposit resources to lend. In this study, by modeling the money-creation behavior of the banking network, we try to answer the question that if the bank can create credit and purchasing power for the firm based on its future income, how will the general variables of the economy, including consumption and... 

Nowadays, two metallic catalyst are used in many organic reaction; so,different types of these catalytic systems have been synthesized up to now and been employed. One of these systems that recently has attracted many attention is magnetic two metallic nanocatalyst, that showing very good activity due to the synergistic effect between the two metal and fine particle size.On the other hand, poly cyclic heterocyclic compounds are one the main families of organic compounds having many application in biochemicals and pharmaceuticals. The main purpose of this project is to introduce a new method for the synthesize of these compounds such as tetrazoles and 1,4-dihydropyridines, using two- and...