Sharif Digital Repository

This MA dissertaion is dedicated to the discussion of the error theory about all normative judgements and its consequences. This theory contains two main claims: 1- normative judgements are beliefs that ascribe normative properties, and 2- no normative property exists. In this dissertation, in particular, Bart Streumer’s arguments against the competitors of this theory are discussed and criticized. Streumer argues against non-reductivism, reductivism, and non-cognitivism in three separate arguments. In another argument, he tries to show that the error theory about all normative judgements is unbelievable. In addition to discussing Streumer’s arguments, I also propose new formulations of some... 

Since 1992, many different methods have been introduced and developed according to the type of application of catalytic Janu micromotors in various fields. In this study, the method of particles masking was used to construct magnesium based catalytic micromotors. The stabilizing of magnesium microparticles was carried out in 3 methods, resuspending with PVP, paraffin and static electricity generation on Slides. Finally, all three methods quality was investigated and paraffin stabilizing was best selected for the stability of particles on the slides. After making the micromotors, the effect of several factors, including the amount of sputtering time, PBS medium with different Ph of (7.4 , 6.4... 

In this work, the recovery of rhenium from ferromolybdenum furnace outgoing dust in semi industrial scale was conducted. The ferromolybdenum furnace outgoing dust contains rhenium as major part and large amounts of molybdenum plus Iron and copper as impurities. An overall flow sheet, consist of leaching, solvent extraction and precipitation methods, was design to recovery and purification of rhenium. Firstly, ferromolybdenum furnace outgoing dust was subjected to leaching treatment by 10 g/L sulfuric as solvent at 85 C. Secondly, solvent extraction method was employed, using LIX984N 10 %vol, to separate copper from rhenium containing solution. The results of MacCab thiele diagram for... 

Network coding, as a novel technique, suggests that the intermediate nodes of a network can combine independent flows to optimize the usage of a shared communication channel. Also, distributed source coding, exploits the joint statistics of correlated information sources to reduce the volume of transmitted information. Surprisingly, it has been shown that linear network codes are able to compress correlated sources. In this project, we have focused on this problem, i.e. joint distributed source and network coding. We have two important contributions with different directions. First we give a practical design for joint coding. Second, we use an evolutionary approach to find the best placement... 

In this thesis, coordination of a group of autonomous agents, through a scalable control structure and with very limited communications, is addressed. Inter-agent action functions are designed to guarantee the network connectivity. Two coordinator agents with different natures are designed. One is attractive and is named leader-agent (LA). The other is repulsive and is named shepherd-agent (SA). Under the assumption that both coordinators locally affect the group, we have proved that the governing equation of the whole group may have variable order.
By using nonlinear control techniques, coordination algorithms are designed to move the group on a predefined path or to a destination. It... 

For designing a unit operation, knowledge about physical properties is essential. This is attained either by direct measurement, which needs spending time and cost or, using proposed correlations. This project is subjected to theoretical analysis of viscosity as the most important rheological property of dilute suspensions of microgels, or in other words colloidal suspensions of porous spheres. They are applied in drug delivery, enhanced oil recovery, synthesis of catalyst and adsorption of heavy metal ions from aqueous systems for water purification purposes. In dilute suspensions particles are faraway from each other and there is no interaction between them therefore, it is better to... 

In the recent years, developing and using android applications has experienced a huge expansion. Due to the novelity of these applications and their environment for developers, we can find so many problems in their perfomance. At the same time as spread of developing these applications, new automatic and non-automatic methods are introduced for testing them. Usually mutation testing methods are used to evaluate new suggested software testing methods, so some rigorous and effective methods of mutation testing for android applications are needed too. Today, some primary methods are suggested for generating mutants of android applications which are not mature yet and have many defects. The goal...