Sharif Digital Repository

Major bone defects resulted from diseases or hurts that can not heal naturally, requaire bone transplantation. golden standard for transplantation is autologus one but it has some disad-vantages such as economic burden, the lack of graft source, surgery on patient, and so on. so exploring altrnative ways led to exploit stem cells.traditionally bone marrow mesenchymal stem cells (MSCs) used for stem cell-bsaed bone regeneration. bone marrow aspiration to aquaire stem cells is painfull and give a population of cells such as hematopoetic cells that requaire to seperate and can not be handled in first passages. MSCs can be substituted by multipotent adipose tissue-derived stem cells (ADSCs) in... 

Network Telescopes are used to extract security features of large a?a?s targeted large net-works.In this method all tra?cs received targeted to an unused address blo? are processedto ?nd useful informations about descriptive parameters of work propagation.Currently all resear?es are focused on dark addresses or unused address blo?s, in this re-sear? the idea is generalized to cover used and white address blo?s. Also the structure ofnetwork telescope is de?ned with a new manner whi?added more details to prediction andestimation methods. To extract security features of a?a?events, a newmethod have been introduced for inferenceabout a?a? parameters. ?e proposed method may be used to predict... 

In the past few decades, many attempts have been made to combine the benefits of homogeneous and heterogeneous catalysts. The immobilization of homogeneous catalysts onto the surface of heterogeneous supports is the result of such efforts. In this research, immobilized heterogeneous catalysts were designed and synthesized based on double network hydrogels, which produce from interpenetrating of two biocompatible and biodegradable polymer networks. In order to provide magnetic responsibility and easy separation of catalyst from the reaction mixture, the magnetic nanoparticles were dispersed onto the surface of double network hydrogel. Finally, various metal nanoparticles such as palladium and... 

One of the most modern types of inlets in aircraft is the Diverterless supersonic inlet, which is used in some new UAVs and fighters, and has many advantages over other types of inlets, especially in removing the boundary layer. The most important part of DSI design is the creation of bump geometry, which requires special precision and elegance. There are various methods for designing and creating bump geometry, some of which are mentioned in this report, and finally the method of creating bump geometry is selected based on the flow around the primary cone, which is in accordance with the analytical method and is in fact the most basic and widely used method.In this study, a DSI with cowl... 

Air transport system of each country consists of three interconnected elements (players); namely (1) Airlines, (2) Airports and (3) Air-Traffic Control. Any increase in the air transport capacity requires consistent growth in each sector. Obviously, any player can start such a process, but cannot continue without proper contribution of the other two. In this work, we study the process of growth capacity increase in the air-transportation system with an emphasis on the Airline characteristics. We show how the growth of an independent Airline will lead to the condition for which any subsequent investment will not have any effect on the quality of services provided by the system. We refer to... 

Agriculture consists a significant share in the economies of developing countries, and since temperatures and precipitation are considered to be the inputs for crop production, climate change has a direct impact on the agricultural sector. In this study, we are investigating the effect of climate change on the production and yield of crops in Iran, and for this purpose, we have used annual changes in temperature, precipitation, production, and yield of crops taking into account the fixed effects of year and district. To do this, we have used the panel data of districts between 1993 and 2015 regarding temperature and precipitation, the area under cultivation, and the amount of crops.... 

Event cameras are bio-inspired sensors. They have outstanding properties compared to frame based cameras: high dynamic range (120 vs 60), low latency, no motion blur. Event cameras are appropriate for using in challenging scenarios such as vision system in self-driving cars and they have been used for high level machine vision tasks such as semantic segmentation, depth estimation. In this project, we worked on semantic segmentation using an event camera for self-driving cars. i) We introduce a large dataset, our dataset was produced using Carla simulator and it contains RGB images, events and semantic segmentation labels. ii) This project introduces new event based semantic segmentation...