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    Synthesis, Characterization and Applications of Antibacterial Metal-Organic Framework Nanocomposites for Water Remediation

    , M.Sc. Thesis Sharif University of Technology Talebi Deylamani, Sara (Author) ; Borghei, Mehdi (Supervisor) ; Yaghmaei, Soheila (Supervisor) ; Ghobadi Nejad, Zahra (Co-Supervisor)
    Contaminants in drinking water, including microbial contaminants, have a great impact on the health of people in the community and can seriously threaten public health. In recent years, diseases caused by pathogenic bacteria due to the consumption of contaminated water have led to many deaths. As a result, water treatment has been one of the most important human concerns. Among the new water treatment technologies, metal-organic(MOF) frameworks are a new generation of porous materials that have properties such as high surface area, water stability and functionality due to their dual structure. As a result, they are widely used today in various scientific fields, including water purification.... 

    Experimental Investigation of Biodiesel Production from Oils by Transesterification Method Catalyzed by Nano-heterogeneous Catalysts

    , M.Sc. Thesis Sharif University of Technology Talebi, Soroush (Author) ;
    Today polyolefin definitely is one of the most applicable polymers in the world. One of these polymers is ultra-high molecular weight polyethylene. Being applicable in a number of high-tech industries such as military service, battery separators, and other areas, expands the usage of these polymers. Electrospinning is one of the molding methods in order to synthesize fiber polymers. Using this method, a great deal of polymer fibers have been prepared. It is worth noting that the device used for olefins should have temperature control and temperature increase ability. The electrospinning device with the temperature control has not been built in the country; therefore, this device has been... 

    Non-statistical rational maps

    , Article Mathematische Zeitschrift ; Volume 302, Issue 1 , 2022 , Pages 589-608 ; 00255874 (ISSN) Talebi, A ; Sharif University of Technology
    Springer Science and Business Media Deutschland GmbH  2022
    We show that in the family of degree d⩾ 2 rational maps of the Riemann sphere, the closure of strictly postcritically finite maps contains a (relatively) Baire generic subset of maps displaying maximal non-statistical behavior: for a map f in this generic subset, the set of accumulation points of the sequence of empirical measures of almost every point in the phase space, is equal to the largest possible one, that is the set of all f-invariant measures. We also introduce an abstract setting to study non-statistical dynamics and sufficient conditions for their existence in a general family of maps. These sufficient conditions are related to the notions of “statistical instability” and... 

    Role of Affective Commitment in the Relationship between Ostracism and Turnover Intention

    , M.Sc. Thesis Sharif University of Technology Zeytonli, Asiyeh (Author) ; Banki, Sara (Supervisor)
    A lot of researchers have suggested that ostracism as a disruptive behavior, has been widespread among organizations and a lot of researches has been studied its consequences in recent years.This research studies ostracism’s consequences and proposes a theoretical model of organizational ostracism with affective commitment, intention to turnover and organizational dependability as one of affective commitment’s antecedents. This study has been done on 231 employees of three medium knowledge-based organizations to identify the effects of ostracism on employee’s turnover behavior. Results show that ostracism, due to its impact on the affective commitment of ostracized peoples, reduces this type... 

    Design of Tensegrity Structure as Supporting Structure of Mesh-Like Deployable Antenna for use in Micro-Satellites

    , M.Sc. Thesis Sharif University of Technology Talebi, Behnam (Author) ; Abedian, Ali (Supervisor)
    Deployable structures have been used on small satellites since the beginning of such space programmes. Here, the design sequence for a special tensegrity structure, for use as supporting structure for deployable mesh-like antenna will be proposed. The design process is conducted to prevent structural elements from failure, and satisfy the minimum specified natural frequency. In this research, structural modeling is performed based on two external geometric parameters (overall height and diameter), and three internal geometric parameters (elements cross-section properties). The pre-stress in structural element is the last design parameter. Also, materials are pre-assigned. Internal forces of... 

    A Stochastic Process Algebra for Ad Hoc Protocols Verification

    , M.Sc. Thesis Sharif University of Technology Talebi, Mahmood (Author) ; Movaghar, Ali (Supervisor)
    Processalgebras,acompositionalmethodofmodelingsystemsandtheirbehavioural features, have been a key instrument in the verification of systems and have strived to completely span a whole spectrum of verification solutions for diverse areas of applications. In this sense, modeling and analysis of the performance metrics in a Mobile Ad hoc Network (MANET) in contrast to other systems, face different challenges which demand different strategies. Hence, our goal here is to model and analyze the qualitative and quantitative aspects of MANETs within one especially designed compositional framework. To achieve this framework, we will first have a look at the different methods which aim to model MANETs... 

    Numerical modeling of adhesively bonded composite patch repair of cracked aluminum panels with concept of CZM and XFEM

    , Article Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering ; Volume 230, Issue 8 , 2016 , Pages 1448-1466 ; 09544100 (ISSN) Talebi, B ; Abedian, A ; Sharif University of Technology
    SAGE Publications Ltd  2016
    Application of composite patches in repair of damaged/aged aircraft structures is one of the most popular repairing methods in aerospace engineering. Since running experiments are difficult, time consuming, expensive, and also require high level of expertise, simulation of the behavior of the patch and also the faulty components after repair can assist designers and engineers in optimization of their designs. In this article, full-scale simulation of a damaged panel that is experimentally repaired with a composite patch will be considered using ABAQUS, a commercial finite element code. The crack growth process is modeled with the extended finite element method and the cohesive zone model... 

    Numerical and Experimental Methods to Optimization and Damage Detection in Composite Patch Repairs

    , Ph.D. Dissertation Sharif University of Technology Talebi, Behnam (Author) ; Abedian, Ali (Supervisor)
    Application of composite patches in repair of damaged/aged aircraft structures is one of the most popular repairing methods in aerospace engineering and because of its advantages the use of this type of repair is increasing today. However, to use these patches in life extension of aged aircraft, the added weight to the structure should be strictly controlled. This could be best done if achieving the optimum and smart design by using optimization and structural health monitoring methods. These two concept about pre-designed of composite patch repair are investigated in this thesis. The simulation by Abaqus software and experimental results and tests will be used for this purpose. In first... 

    Optimization of composite patch repair for maximum stability of crack growth in an aluminum plate

    , Article Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science ; Volume 231, Issue 20 , 2017 , Pages 3690-3701 ; 09544062 (ISSN) Talebi, B ; Abedian, A ; Sharif University of Technology
    In this paper, the configuration parameters of pre-designed composite patch repair are optimized with the aim of achieving the highest level of stability of crack growth in aluminum in the presence of some constraints such as weight, load sustainability, shear stress in the adhesive layer and maximum stress in the patch. For this purpose, the patch is modeled in full scale by ABAQUS, a commercial finite element code. The crack growth process is simulated with the extended finite element method under uniaxial tensile loading, and the Cohesive Zone Model is used to model the progressive damage in the adhesive of the composite patch repair. Also, sensitivity analysis is performed on the... 

    Conceptual Study of an Unmanned Water-Thrusted Aerial Firefighting System (UWFS)

    , M.Sc. Thesis Sharif University of Technology Talebi, Mohammad (Author) ; Saghafi, Fariborz (Supervisor)
    In this research work, the concept of an unmanned aerial firefighting system with water thrusters has been studied. This system consists of a platform head, a waterhose and a ground pump. The concept is briefly to pump water through the hose and then fall it down on fire from the platform. This conceptual system may have many other applications. The other applications have also been addressed in the introduction section. This platform can be considered as an unmanned aerial vehicle whose lift and control forces is provided by water thrusters. The conceptual study has been carried out based on three subjects of preliminary sizing, system dynamic modeling and controller design for platform... 

    A Bounded Translation of Universal Quantifier-Free Sequents of Intuitionistic Predicate Logic into Basic Predicate Logic

    , M.Sc. Thesis Sharif University of Technology Talebi, Marzieh (Author) ; Ardeshir, Mohammad (Supervisor)
    In this thesis we construct a bounded translation of intuitionistic predicate logic into Basic predicate logic with restricted use of universal quantifier and without equality inspired by papers [1] and [2]  

    Management of Classifiers Pool in Data Stream Classification Using Probabilistic Graphical Models

    , M.Sc. Thesis Sharif University of Technology Talebi, Hesamoddin (Author) ; Beigy, Hamid (Supervisor)
    Concept drift is a common situation in data streams where distribution which data is generated from, changes over time due to various reasons like environmental changes. This phenomenon challenges classification process strongly. Recent studies on keeping a pool of classifiers each modeling one of the concepts, have achieved promising results. Storing used classifiers in a pool enables us to exploit prior knowledge of concepts in the future occurrence of them. Most of the methods presented so far, introduce a similarity measure between current and past concepts and select the closest stored concept as current one. These methods don’t consider possible relations and dependenies between... 

    Numerical Simulation of Incompressible Turbulent Flow with the Artificial Compressibility-Based Incompressible Smoothed Particle Hydrodynamics

    , M.Sc. Thesis Sharif University of Technology Talebi, Mahyar (Author) ; Hejranfar, Kazem (Supervisor)
    In the present study, an incompressible smoothed particle hydrodynamics based on the artificial compressibility method is applied for simulating the incompressible turbulent flows. The Reynolds-averaged incompressible Navier–Stokes equations using the artificial compressibility method in the Eulerian reference frame are written in the Lagrangian reference frame to provide an appropriate incompressible SPH algorithm for the turbulent flow computations. Here, the k-L_m turbulence model, which is a simplified k-ϵ turbulence model, is used and formulated in the Lagrangian reference frame. The SPH formulation implemented here is based on an implicit dual-time stepping scheme to be capable of... 

    Spin and charge fluctuations in a one-dimensional lattice with long-range interactions

    , Article Physica B: Condensed Matter ; Volume 571 , 2019 , Pages 204-209 ; 09214526 (ISSN) Talebi, A. H ; Davoudi, B ; Sharif University of Technology
    Elsevier B.V  2019
    We study the competition between spin and charge fluctuations of the extended Hubbard model with on-site and dipole-dipole interactions in a one-dimensional lattice. Using the extended two-particle self consistent (ETPSC) method, we find the corresponding expressions for spin and charge response functions. In this approach, the irreducible spin and charge vertices are a function of inter-particle distance (r) and wave-number (q). This theory allows us to determine the crossover temperatures and the dominant instability as a function of U and V. The phase diagrams are obtained for several effective particle densities: n = 0.5, n = 1 and n = 4/3. Each phase diagram (U − V − T space)... 

    Performance of BRBF System and Comparing it with the OCBF System

    , M.Sc. Thesis Sharif University of Technology Talebi, Elnaz (Author) ; Kazemi, Mohammad Taghi (Supervisor)
    Buckling-Restrained Braced Frame system (BRBFs) are a new type of steel seismic-load-resisting system that has found use in several countries because of its efficiency and its promise of seismic performance far superior to that of conventional braced frames. The system is addressed in the 2005 edition of the AISC Seismic Provisions for Structural Steel Buildings, also a set of design provisions has been developed by NEHRP. This thesis illustrates the seismic design of buckling-restrained braced frames and compares its seismic performance with the performance of ordinary bracing systems. This work investigates the advantage and disadvantages of this new type of seismic resisting. By having... 

    Experimental Investigation of Pressure Distribution on the Surface of a Supercritical Airfoil in Transonic Regime

    , M.Sc. Thesis Sharif University of Technology Talebi, Masoud (Author) ; Soltani, Mohammad Reza (Supervisor)
    Transonic flow study is important due to its vast applications. Supercritical airfoils are designed for transonic flow to postpone drag divergence and reduce the strength of shock. This type of airfoils are chiefly used in modern commercial airplanes because of their low drag in transonic regime and, as a result, reduction in their fuel consumption. Using supercritical airfoils needs accurate investigation of flow field due to several influential factors such as specific geometry, nonlinear nature of flow phenomena, and compressibility effects. However, the availability of experimental and numerical data for supercritical airfoils is less than that of the conventional ones. Thus,... 

    Asynchronous track-to-track fusion by direct estimation of time of sample in sensor networks

    , Article IEEE Sensors Journal ; Vol. 14, issue. 1 , Jan , 2014 , p. 210-217 ; 1530437X Talebi, H ; Hemmatyar, A. M. A ; Sharif University of Technology
    Asynchronous data fusion is inevitable in track-to-track fusion for tracking high-speed targets. For low-speed targets, e.g., the movement of clouds, synchronization is insignificant and, depending on the application, may be disregarded. Real-time asynchronous fusion is a demanding task in sensor networks when the sensors are not synchronous in sampling-rate or in sampling-phase. In the method proposed in this paper, an estimator in the fusion center estimates the actual time of the sample with respect to the time-reference of the fusion center upon receiving the data from a sensor. Then, the computer of the fusion center uses predictions to transfer all the received data to the data... 

    Synthesis and Photophysical Study of Heterobinuclear Cyclometalated Pt-Au Complexes

    , M.Sc. Thesis Sharif University of Technology Talebi Mojarad, Tahereh (Author) ; Jamali, Sirous (Supervisor)
    The cyclometalated heterobinuclear platinum-gold complexes [PtMe(bhq)(dppy)AuCl], 2, and [PtMe(bhq)(dppy)Au(NHC1)] PF6, 3, in which bhq= benzo{h}quinoline, dppy = 2-diphenylphosphinopyridine and NHC1 = 1,3-dimethylimidazol-2-ylidine have been prepared by reaction of the cyclometalated platinum complex [PtMe(bhq)(dppy)], 1, with 1 equivalent of AuCl(SMe2) or 1 equivalent of [Au(NHC1)]+ (prepared from ClAu(NHC1) and AgPF6), respectively. Complexes 2 and 3 were fully characterized using multinuclear NMR spectroscopy (1H, 31P). However complex 2was further characterized by x-ray crystallography, crystallization of complex 3 leads to form anew dimer complex 4,[Pt2(bhq)2(-dppy)2]2(PF6)2. The NMR ... 

    Improving Reliability of Screw Compressor by Condition Monitoring

    , M.Sc. Thesis Sharif University of Technology Talebi Ahooie, Elahe (Author) ; Behzad, Mahdi (Supervisor)
    Screw compressors are one of the most applicable compressors in marine engineering. Producing of compressed air for ignition of ship’s disel engine, air conditioning, cooling of food and producing of Nitrogen are applications of this compressor in marine industry. So, improving reliability of these compressors is so important.First of all, componenets of screw compressors, failure modes and different ways for improving reliability of this compressor are studied. The best way to improve reliability of rotating machinery is condition monitoring and so this way was chosen to be studied. In this approach, by using CM data and failure history data of a high pressure water descaling pump are used... 

    Optimum and reliable routing in VANETs: An opposition based ant colony algorithm scheme

    , Article 2013 International Conference on Connected Vehicles and Expo, ICCVE 2013 - Proceedings ; 2013 , Pages 926-930 Kazemi, B ; Ahmadi, M ; Talebi, S ; Sharif University of Technology
    IEEE Computer Society  2013
    By the advancement in technology on one side, and governmental as well as social demands for lowest rate of driving accidents and reliable communication among vehicles on the other side, particularly in highways, vehicular ad-hoc networks (VANETs) are of special interest as a reliable approach to this aim. VANET is typically defined as the communication network for wireless communicating between vehicles in a region. One of the most important challenges in such networks is reliable routing of data packages among the vehicle users. Several VANET routing topologies are published in the literature; however, there is still a lack of reliable scheme. This is due to the nature of users behaviour...