Pathology of Iran's Water Resources Management Laws Using A Systems Dynamics Approach and the Development of Necessary Frameworks for New Law Development

, M.Sc. Thesis Sharif University of Technology Maleki Ghaleh, Hamid Reza (Author) ; Ardakanian, Reza (Supervisor) ; Khorashadizadeh, Farkhondeh (Supervisor) ; Bagheri, Ali (Co-Supervisor)

Abstract

The water crisis in Iran is not only caused by climatic changes, in other words, human factors have also influenced the increase in water consumption. The intertwining of various economic, political, and social factors has caused a direct and dynamic impact on water resources. Undoubtedly, one of the most important processes in policy-making and in the continuation of planning the country's water resources is the approval of useful laws from the point of view of implementation, monitoring and finally having a positive impact on the subject under discussion. From this point of view, the main research question is the role of laws on the current state of water resources management. The first...

Strategic Studies on Bioproducts Supply at the Present Situation of Local and Global Markets

, M.Sc. Thesis Sharif University of Technology Hosseini, Hamid Reza (Author) ; Roostaazad, Reza (Supervisor) ; Maleki, Ali (Co-Advisor)

Abstract

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...

Investigating on Filtration of Solid Particles in Culture Media after Fermentation

, M.Sc. Thesis Sharif University of Technology Maleki, Maziar (Author) ; Roosta Azad, Reza (Supervisor)

Abstract

In biotechnology processes, in addition of culture media there is a solid phase which dispensed across the system.In most of bioprocesses, first operational unit for downstream treatment is the separation of this particles from fermentation liquor. In contrast with other categories like inorganic chemistry, solid particles in fermentation liquor (which the main part of it is biomass itself) have complicated physical & rheological properties. For example, all of biomass species are hydrophilic and sometimes form colloidal solutions.With this perspective, separation of solid phase from fermentation liquor is a hard challenge in this kind of processes.In this research, with regard of great...

Dynamic Analysis of Torsional Vibration of Ship Shaft

, M.Sc. Thesis Sharif University of Technology Maleki, Ali (Author) ; Sayyadi, Hasan (Supervisor) ; Mehdigholi, Hamid (Co-Advisor)

Abstract

Torsional vibration is a phenomenon that caused shear in rotational shafts by out of center torsion. This issue must be considered in design of shafts. Unfortunately,the rules for designing shafts that suggested by standards causes that producers don’t try to usefurther calculation for designing shafts.
In this thesis, at first and by use of finite element method and ANSYS, a shaft of a vesselthat designed based on BV rule was modeled in the software, then, the model was analyzed by modal analysis of the software. In the next level, by specifying the defect of designed shaft, optimizing of shaft’s system to minimize the first torsional natural frequency is applied. In this case, by use...

Surface layer nanocrystallization of carbon steels subjected to severe shot peening: Analysis and optimization

, Article Materials Characterization ; Volume 157 , 2019 ; 10445803 (ISSN) Maleki, E ; Unal, O ; Reza Kashyzadeh, K ; Sharif University of Technology

Elsevier Inc 2019

Abstract

Severe shot peening (SSP) process is widely used for surface nanocrysallization of a bulk material that demonstrates excellent mechanical properties compared with its coarse-grained equivalents. In this study, a plastically deformed surface was produced with nanostructured grains on different materials of AISI 1045, 1050, and 1060 carbon steels by means of SSP. Shot peening was applied with a wide range of Almen intensities and coverages. Optical microscopy, scanning electron microscopy, field emission scanning electron microscopy, high resolution transmission electron microscope observations, and X-ray diffraction analysis were employed to analyze the mechanism of grain refinement...

Efficiency analysis of shot peening parameters on variations of hardness, grain size and residual stress via taguchi approach

, Article Metals and Materials International ; Volume 25, Issue 6 , 2019 , Pages 1436-1447 ; 15989623 (ISSN) Maleki, E ; Unal, O ; Reza Kashyzadeh, K ; Sharif University of Technology

Korean Institute of Metals and Materials 2019

Abstract

In the present study, the main purpose is to detect the most key factors of shot peening (SP) process on the microhardness, grain size, and residual stress of AISI 1060 high carbon steel. The specimens were treated using various types of SP process namely conventional shot peening and severe shot peening. Several experiments were performed to study metallurgical and mechanical properties of AISI 1060 steel. Almen intensity and surface coverage from one side and microhardness, grain size, and residual stress from the other side were considered as input and output parameters for the design of experiment methodology, respectively. The L18(21and31) mixed level of Taguchi orthogonal array design...

Identification of the Set of Single Nucleotide Variants in Genome Responsible for the Differentiation of Expression of Genes

, M.Sc. Thesis Sharif University of Technology Khatami, Mahshid (Author) ; Rabiee, Hamid Reza (Supervisor) ; Beigi, Hamid (Supervisor)

Abstract

Single nucleotide polymorphs, There are changes caused by a mutation in a nucleotide in the Dena sequence. Mononucleotide polymorphisms are the most common type of genetic variation. Some of these changes have little or no effect on cells, while others cause significant changes in the expression of cell genes that can lead to disease or resistance to certain diseases. Because of the importance of these changes and their effect on cell function, the relationships between these changes are also important. Over the past decade, thousands of single disease-related mononucleotide polymorphisms have been identified in genome-related studies. Studies in this field have shown that the expression of...

Synthesis & Characterization of Au-HKUST-1 Nanocomposite and Evaluation of Plasmonic Properties of Gold Nanoparticles in this Nanocomposite

, M.Sc. Thesis Sharif University of Technology Moazzeni, Hamid Reza (Author) ; Madaah Hosseini, Hamid Reza (Supervisor)

Abstract

In the past few years, many research works on the controllable integration of metal nanoparticles and metal-organic frameworks were done, since the obtained composite material shows a synergism effect in catalysis and photocatalysis, drug delivery applications, gas, and energy storage, as well as sensing. For the first time, in this study, we employed template-assisted growth to synthesize Au-HKUST-1 Nanocomposite. XRD analysis entirely confirms that employing this strategy in synthesizing Au-HKUST-1 was wholly successful, and the plasmonic properties of this nanostructure were studied via UV-visible spectroscopy. In the course of synthesis, gold nanoparticles with 70nm diameter were...

Live Layered Video Streaming over Multichannel P2P Networks

, M.Sc. Thesis Sharif University of Technology Ghalebi, Elahe (Author) ; Rabiee, Hamid Reza (Supervisor)

Abstract

Nowadays, video streaming over peer-to-peer networks has become an interesting field to deliver video in large scale networks. As multi-channel live video streaming networks increase,distributing video with high quality among channels faces many challenges. The most significant challenges cause from frequent channel churns, unbalanced channel resources, network heterogeneity and diversity of users’ bandwidths. They include: nodes’ unstability, low users participations, large startup and playback delays, low video quality received by users and lack of resources in unpopular channels.In order to solve the above problems, we have proposed several solutions such as: 1- using distribution groups...

Local Community Detection in Social

, M.Sc. Thesis Sharif University of Technology Rajabi, Arezoo (Author) ; Rabiee, Hamid Reza (Supervisor)

Abstract

The fast growth of social networks and their wide range of applications have made the anal-ysis of them an interesting field of research. The growth of concern in modeling large social networksand investigation of their structural features leads studies towards community detec-tion in such networks. In recent years, a great amount of effort has been done for introducing community detection algorithms, many of which are based on optimization of a global cri-terion which needs network’s topology. However, because of big size of most of the social networks , accessing their global information tends to be impossible. Hence, local commu-nity detection algorithms have been introduced. In this...

Improving Graph Construction for Semi-supervised Learning in Computer Vision Applications

, M.Sc. Thesis Sharif University of Technology Mahdieh, Mostafa (Author) ; Rabiee, Hamid Reza (Supervisor)

Abstract

Semi-supervised Learning (SSL) is an extremely useful approach in many applications where unlabeled data can be easily obtained. Graph based methods are among the most studied branches in SSL. Since neighborhood graph is a key component in these methods, we focus on methods of graph construction in this project. Graph construction methods based on Euclidean distance have the common problem of creating shortcut edges. Shortcut edges refer to the edges which connect two nearby points that are far apart on the manifold. Specifically, we show both in theory and practice that using geodesic distance for selecting and weighting edges results in more appropriate neighborhood graphs. We propose an...

Investigating Conformal Vector Field on Riemannian Manifolds

, M.Sc. Thesis Sharif University of Technology Hessam, Hamed (Author) ; Fanai, Hamid Reza (Supervisor)

Abstract

At first the killing vector fields will be investigated. Conditions are introduced for the hypersurface of a Riemannian manifold with a killing vector field to be equipped with the same killing vector field. Then 2-killing vector field is studied and its relation with killing vector fields and monotone vector fields is presented. After that conformal vector fields are discussed and conditions are introduced in order that the Riemannian manifold equipped with a conformal vector field, isisometric to n-dimensional sphere with constant curvature. Finally we will present the conditions which conformal vector field is a 2-killing vector field. Then we will present the results in which the...

Network Topology Inference from Incomplete Data

, M.Sc. Thesis Sharif University of Technology Siyari, Payam (Author) ; Rabiee, Hamid Reza (Supervisor)

Abstract

During the last decade, there have been a great number of researches on complex networks.Data aggregation is the first step in the analysis of these networks. However, due to the large scale of them, almost never is there complete information about a network’s different aspects. Therefore, analysis of a complex network is usually done based on the incomplete data. Al-though a good sampling approach in a way that the achieved sample is a good representative of the whole network has its own challenges, analysis of incomplete data causes a significant alternation in the estimation results. Consequently, one of the first problems emerging after sampling is the possibility of predicting the...

Continuous Time Modeling of Marked Events

, Ph.D. Dissertation Sharif University of Technology Hosseini, Abbas (Author) ; Rabiee, Hamid Reza (Supervisor)

Abstract

A great deal of information are continuously generated by users in different contexts such as social networks and online service providers in terms of temporal marked events. These events indicate that what happened to who by when and where.Modeling such events and predicting future ones has interesting applications in different domains such as item recommendation in online service providers and trending topic prediction in online social networks. However, complex longitudinal dependencies among such events makes the prediction task challenging. Moreover, nonstationarity of generative model of events and large size of events, makes the modeling and learning the models challenging.In this...

Analysis and Modeling of User Behavior over Social Media

, Ph.D. Dissertation Sharif University of Technology Khodadadi, Ali (Author) ; Rabiee, Hamid Reza (Supervisor)

Abstract

Nowadays many of us spend a big part of our daily times on social media.One of the most important research problems in social media analysis is how to engage users. The trace of user activity over these websites is a valuable resource for user understanding and engagement, but this data is very huge and unstructured. An approach to deal with this problem is user behavior modeling. In this process, first a behavioral model is considered for users, then using the activity data and the behavioral model, some parameters are learned. Finally, using the learned parameters, a user profile is constructed for each user. This profile can be used for user engagement and many other applications....

Influence of Fe3O4 nanoparticles in hydroxyapatite scaffolds on proliferation of primary human fibroblast cells

, Article Journal of Materials Engineering and Performance ; 2016 , Pages 1-9 ; 10599495 (ISSN) Maleki Ghaleh, H ; Aghaie, E ; Nadernezhad, A ; Zargarzadeh, M ; Khakzad, A ; Shakeri, M. S ; Beygi Khosrowshahi, Y ; Siadati, M. H ; Sharif University of Technology

Springer New York LLC 2016

Abstract

Modern techniques for expanding stem cells play a substantial role in tissue engineering: the raw material that facilitates regeneration of damaged tissues and treats diseases. The environmental conditions and bioprocessing methods are the primary determinants of the rate of cultured stem cell proliferation. Bioceramic scaffolds made of calcium phosphate are effective substrates for optimal cell proliferation. The present study investigates the effects of two bioceramic scaffolds on proliferating cells in culture media. One scaffold was made of hydroxyapatite and the other was a mixture of hydroxyapatite and ferromagnetic material (Fe3O4 nanoparticles). Disk-shaped (10 mm × 2 mm) samples of...

The stability and surface activity of environmentally responsive surface-modified silica nanoparticles: the importance of hydrophobicity

, Article Journal of Dispersion Science and Technology ; Volume 41, Issue 9 , 2020 , Pages 1299-1310 Ghaleh, V.R ; Mohammadi, A ; Sharif University of Technology

Taylor and Francis Inc 2020

Abstract

In this study, the effect of hydrophobicity of environmentally responsive surface-modified silica nanoparticles on the stability and surface activity of the nanoparticles is examined. To this end, n-propyl, n-hexyl, or n-octyl chains and methoxy poly(ethylene glycol) chains at various quantities were coated covalently on the surface of silica nanoparticles to regulate the hydrophobicity of the responsive nanoparticles. Various experimental tools such as stability analysis, interfacial-tension and contact-angle measurements, and emulsion formation were performed to investigate the effect of hydrophobicity. It became evident that the presence of the hydrophobic agents influences considerably...

Design of Floating Antenna Release System

, M.Sc. Thesis Sharif University of Technology Ghaleh, Hossein (Author) ; Durali, Mohammad (Supervisor)

Abstract

Communication Buoys are devices that facilitate radio communication between underwater ships and surface stations. In this research such device is thoroughly designed for a submersible application. The system comprises of buoy, connection cable, buoy cavity, cable passage, winch and other supporting and safety subsystems. Buoy and cable system was analyzed in a general form and their stable states were determined for different ship maneuvers, sea streams, and wave conditions. Based on this, optimum buoy geometry and cable length were found for the defined application and other subsystems were detail designed. To evaluate the design, some of the system components were manufactured and...

Using Statistical Pattern Recognition on Gene Expression Data for Prediction of Cancer

, M.Sc. Thesis Sharif University of Technology Hajiloo, Mohsen (Author) ; Rabiee, Hamid Reza (Supervisor)

Abstract

The classification of different tumor types is of great importance in cancer diagnosis and drug discovery. However, most previous cancer classification studies are clinical based and have limited diagnostic ability. Cancer classification using gene expression data is known to contain the keys for addressing the fundamental problems relating to cancer diagnosis. The recent advent of DNA microarray technique has made simultaneous monitoring of thousands of gene expressions possible. With this abundance of gene expression data, researchers have started to explore the possibilities of cancer classification using gene expression data and quite a number of Pattern Recognition approaches have been...

Relations Between Dynamical Systems And Knot Theory

, M.Sc. Thesis Sharif University of Technology Madani, Meysam (Author) ; Fanaii, Hamid Reza (Supervisor)

Abstract

In fact knot theory is working by an elastic string. A knot is A smooth embedding of in . We say that two knots are equivalent if there is an ambient isotopic between them. In knot theory we study equivalent classes of knots. As it seems from its name, a dynamical system is the study of motions, mechanics and dynamics of a system. We will observe some systems and stability of orbits in theme. Then we define templates which contain orbits in themselves. At last, we observe relations between discrete dynamical systems and knot theory. Then for any arbitrary chaotic knot we observe that there exist an universal template that contain a copy of any kind of not. Finally we will study some open...