Sharif Digital Repository

Through the recent years application of FRP material in structural engineering has been developed significantly. According to possible changes of a building function during its lifetime or alteration of the building codes, building structures usually need to be strengthened. Referring to merits of FRP material, its application seems to be a convenient idea toward the cited requirement. Curved beam and slab are known as highly used elements in building structures. Bridges composed of horizontal or vertical arches could be noted as common examples which need to be reinforced by FRP. However curved concrete surfaces, reinforced by FRP plates, seem to be studied than it is really required; For,... 

The purpose of this thesis is to investigate and identify the performance of a class D gas turbine and improve its efficiency.This thesis contains three parts: first part is to choose a specific engine in class D, for our case “Centaur 40”, then this engine, model and validate by GASTURB with existed data.Second part is tosurvey methods of pgradedemonstrated gas turbine with regard to upgraded Solar Centaur 40 “Taurus 60” using the FORTRAN code base on Stage Stacking method.Finally,the last part of this thesis is to investigate Compressor-Turbine matching. In this part the matching zone of the original and upgraded gas turbines are determined and effect of upgrading on matching zone is... 

This study investigates the cyclic experimental behavior of damaged exterior reinforced concrete beam–column joint specimens retrofitted with the proposed technique using steel elements called steel prop and curb. The technique is usable for local and global strengthening of reinforced concrete frames. Four half-scale RC joints were tested under the cyclic loading; two control specimens with the different beam heights were loaded up to their ultimate strength and this was followed by retrofitting of these damaged specimens as new specimens and tested again under the same loading system. This study indicate the importance of some parameters such as friction , jacket place , thickness of plate... 

Among cryptography devices, resource constrained devices like sensors, RFID tags, smart cards and etc need a special class of cryptography algorithms. These devices have three limitations: memory, consumed power and computing power. Therefore, need a special class of cryptography algorithms that is lightweight cryptography. Lightweight cryptography systems have features and limitations that make them more vulnerable against attacks such as power analysis attacks. For this reason strengthening them against these attacks need more attention. So far, various countermeasure for secure implementation of different cryptography systems proposed. Most of them trying to decrease the correlation... 

Seismic behavior of multi-story frames widely has been studied in recently. So that such studies can lead the earthquakes-resistance system to better performance. The dramatic growth of computer processing power make it possible that nonlinear dynamic analysis of structures with great precision could be done. One of the advantages of nonlinear analysis is achieve behavioral performance of structures during an earthquake. Knowledge of the performance, enables us to identify structural weaknesses result in devising to improve these. The aim of this study is to evaluate the seismic performance of reinforced concrete frames have been improved, using different techniques. The frames are designed... 

In recent years, in order to investigate the structural performance in seismic zones, concrete column reinforcement and observing their behavior under cyclic loading have attracted considerable attentions. The ductility and energy absorption capability of structure play an important role in structural performance against earthquake and consequently its failure patterns. A new chapter of these investigations has begun by the reinforcement of the concrete members, a major part of which is concerned with the confinement of concrete members in order to increase their ductility and energy absorption against the forces induced by earthquake. In this study, three prominent methods of concrete... 

Golpayegan Qaed Basir Petrochemical Company is one of the lucrative and entrepreneurial companies in Iran. Every day in this complex, a large amount of wastewater is being generated and transferred to the evaporative lag after the primary and secondary purification outside the complex and it is not restored. Considering the growing importance of surface and underground water resources, reuse of wastewater is a valuable production. In this research, the optimization of the sewage treatment system of the complex was evaluated by replacing the chemicals in the primary purification unit and also by using chloride-ferric and trickling filter for tertiary purification(treating) of the... 

in the present situation most of the bioproducts are supplied at the global markets. hence newcomers and also existing suppliers should study the economic and social trends to make strategic decisions in order to enter new markets. analysis of the effect of different parameters on the market entrance strategy is the main focus of this thesis. the pivotal subject of this thesis is the analysis of Enzyme industry value chain in Iran and the role of each actor and their interactions with each other. after visualizing the Enzyme industry value chain, we want to answer this question: what are the main obstacles for entering the Enzyme industry due to the interactions between the industry... 

The aim of this project was to upgrade and reduce viscosity of heavy oils by adsorbing of asphaltene on Ni-Mo/CB and converting it into lighter and more valuable gas and liquid compounds. Asphaltene has been extracted from a heavy crude oil sample of Soroush oil field in Iran. After adsorption, Asphaltene conversion to lighter components (gas/liquid) was studied through hydrocracking process. To prepare the support of catalyst, Carbon Black, initially a thermal treatment step under the argon gas atmosphere followed by acid-washing process was performed. Afterward, the catalysts was prepared through dry impregnation method. In order to activate catalyst for hydrocracking, the catalysts has... 

In recent years, utilization of hybrid attached and suspended growth system for modification of conventional activated sludge systems has attracted a lot of attentions. Nowadays, with development of urban areas and also introducing new emerging contaminants and as a result an increase in the influent loading of wastewater treatment facilities, the importance of upgrading and retrofitting available facilities have been highlighted. Conversion of Sequencing Batch Reactors to Sequencing Batch Biofilm Reactors is a viable solution for overcoming these problems. Eventhough several researches have been conducted on removal of different contaminants through these systems, the information about the... 

Today, global value chains(GVCs) have distributed the production of goods and services all over the world and have become the main part of global trade. GVCs provide developing countries with oppurtunities for engaging in economic activity and producing goods, without developing all the infrastructure needed for producing it yourself. but participating in GVCs also pose some challenges to developing countries. if developing countries do not enhance their ability for generating value-added, by losing the advantage of cheap labour over time, they will fall into the so-called "middle-income trap". therefore upgrading, with the broad definition of generating more value-added, should be targeted...