Sharif Digital Repository

Phenomena such as will and volition, the emergence of qualities, internal and external feelings are the main problems related to consciousness. Consciousness is one of the oldest and, of course, most complex problems in science, and scientists are striving to provide a suitable explanation for this problem, but a complete answer has not yet been presented. Quantum consciousness is also an attempt to provide a suitable answer using the theory of quantum mechanics as the most fundamental scientific theory regarding the behavior of matter. In this area, the Orch OR theory by Penrose-Hameroff, the Henry P. Stap’s theory of quantum consciousness, and the Eccles-Beck’s theory of quantum... 

Polymer translocation through the nanopores is one of the fundamental macromolecular processes in life. Some examples are , mRNA translocation through nuclear pores, injection of DNA from a virus head into a host cell, protein translocation across biological membranes through membrane channels. Also some applications are suggested for the process, e.g. DNA sequencing by probing the signals during the translocation, drug delivery and/or gene therapy. During the translocation the polymer should pass entropic barrier of the pore and it can be facilitated by changing the chemical potential, application of eclectic field, flow field, or chemical concentrations. In electrically driven... 

The use of named entity recognition systems as preprocessing is used in many natural language analysis issues. With the advent of deep learning, the methods of this area were also affected. Today, there is considerable progress in this area due to the development of data resources for English, Chinese, German, and Spanish. They are also good trained models in formal Persian. However, for informal Persian, which contains a large portion of the web content under the Web, the current models do not produce a suitable solution. In this study, we use the same approach to train our models due to achieving state-of-the-art results in pre-trained models. On the other hand, there is a lack of standard... 

Mixed matrix membranes (MMMs) are new generation of membranes which possess simple processability of polymeric membranes and high separation ability of zeolitic membranes. The present study, concentrates on the fabrication of MMM for CO2/CH4 separation in a combined method as encompasses not only higher permeability but also superior selectivity in comparison with conventional polymeric membranes. The most appropriate technique for MMM making, is the process which provides participation of distributed zeolite particles in separation efficiently while the polymeric matrix acts just like a particle support and dose not play an effective role in separation. Investigations demonstrates that... 

Nowadays recommender systems are one of the most important parts of big websites. These systems help users to find their intended items among enormous amounts of data. Traditionally, recommender systems are designed and implemented using different methods such as content based, collaborative and demographic filtering. Each of these methods had some problems that lead to emergence of a new kind of recommender systems called hybrid recommender systems. This kind of recommender systems try to combine the other methods and make them better. In this thesis, we have selected some previous recommender systems and then, we have made a new system by combining and reforming them. The resulted... 

Image registration is one of the fundamental and essential tasks for medical imaging and remote sensing applications. One of the most common challenges in this area is the presence of complex spatially varying intensity distortion in the images. The widely used similarity metrics, such as MI (Mutual Information), CC (Correlation Coefficient), SSD (Sum of Square Difference), SAD (Sum of Absolute Difference) and CR (Correlation Ratio), are not robust against this kind of distortion; because stationarity assumption and the pixel-wise independence cannot be obeyed and captured by these metrics. In this research, we proposed a new intensity-based method for simultaneous image registration and... 

The ternary 122-type AeFe2As2 (Ae=Ba,Sr,Ca) compounds are antiferromagnetic metals with the orthorhombic lattice structure at ambient pressure and low temperature. By applying mechanical pressure, structural, magnetic and superconducting transitions occur in these compounds. The isovalent doping of Ba with Sr and Ca elements induces chemical pressure and reduces the onset pressure of these transitions. The main purpose of this thesis is to investigate and compare the effects of mechanical and chemical pressures on the structural and magnetic phase transition in the 122 compounds. To achieve this purpose, we have done first-principle calculations for many properties such as the structural... 

In order to increase the mechanical properties and resistance of hydrogels to external damage, for their wide application in tissue engineering and medicine, self-healing two-grid hydrogels are used. Two-grid hydrogels with physical lattice have more advantages than two-grid hydrogels with chemical lattice because they have reversible and dynamic bonds, which in addition to increasing mechanical properties, also have self-healing properties. In order to achieve high mechanical properties, gelatin-based double-grid hydrogels with hydrogen bonding and metal-ligand interaction are designed. In the present paper, two-grid hydrogels consisting of gelatin network and other network of sodium... 

Excavation of metro tunnel beneath groundwater level causes disturbance of hydro geological balance and change in stress conditions at its environment. One of the usual methods of the tunnel construction is utilizing tunnel boring machine and one of the most important of them is called TBM-EPB which takes advantage of the earth pressure balance method. Control of surface settlements which is a result of creating underground space in urban area is a matter of great importance and is influenced by various parameters. This thesis has tried to investigate factors such as geotechnical properties among cohesion, internal friction angle, elasticity modulus, permeability and porosity and also... 

This project aims to determine seismic performance coefficients of Off-Center Braced lateral load resisting system (OBS) equipped with Buckling-Restrained Braces (BRBs), along with comparing its seismic performance in extreme seismicity level with those of Special Moment Frame (SMF). For this intent, the structural design of 24 regular-in-height residential OBS-BRB models was first carried out following ASCE7-16. Then, Static (Pushover) and Incremental Dynamic Analysis (IDA) were performed on the models using the methodology of FEMA P-695 to obtain the target coefficients. Furthermore, the coefficients were used for Pushover and IDA analysis of 27 irregular-in-height OBS-BRB models with soft... 

With the daily increase in the volume of information and due to the growth and pervasiveness of wireless networks, the structures and the way of connection of intermediate nodes have become very important in terms of energy, communication speed and communication overhead. In this thesis, we examine the structure of directionless wireless networks assuming nodes are selfish. In these networks, nodes seek to minimize their costs while being required to access all nodes with limited path length. Due to the selfishness of nodes, we used game theory to analyze the structure and behavior of nodes by calculating the Nash equilibrium state and to compare these networks with networks that are managed... 

Inelastic analysis of frames is considered in many researches to obtain the capacity of strength and deformation and also to predict of their realistic behavior. The yielded inelastic zones in the frames, usually occur in the limited length of the beams or columns. One of the inelastic analysis methods is the inelastic hinge method, where the inelastic behavior of elements is concentrated at the hinges, while the other regions are assumed to be elastic. Existing in the inelastic zones, the internal forces are not independent from the each other, and against the elastic zones, the interaction among them are important, too. In the present research, by using of the inelastic hinge concept, a... 

In this research project, It has been investigated the ability of thenoyltrifluoroacetone (HTTA) as a carrier for selective separation of yttrium ions from aqueous media using bulk liquid membrane (BLM) system as a simple model for selective separation of 90Y from radioactive liquid wastes by the mentioned technique. Thus, a study has been made on carrier-mediated transport of yttrium(III) using a bulk liquid membrane prepared by dissolving thenoyltrifluoroacetone (HTTA) in dichloromethane. It has been observed that the use of n-propylamine (n-PA) in source phase as a synergistic reagent showed a marked enhancement of transport of yttrium ion. The source phase comprised of a solution of ... 

In this Thesis, attitude and orbit of a satellite is estimated using a star sensor and an earth sensor. An algorithm has been developed to estimate satellite attitude and orbit that can be implement on a satellite as strap-down hardware. This system has an uncomplicated implementation compared with platform based systems. That mentioned algorithm estimates satellite orbit by using identified star vectors via star sensor and identified earth vector via earth sensor simultaneously. It also knows the stars vectors according to Star Catalog. Attitude estimation is also executed using both star and earth sensor. It has to be said that an Unscented Kalman Filter synthesize both sensors output data...