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    Percolation theory in reservoir engineering

    , Book King, P. R ; Masihi, Mohsen
    World Scientific  2018

    Performance of RC Shear Walls Strengthened by Vertical Strips of Steel Plates under Seismic Loading

    , M.Sc. Thesis Sharif University of Technology VatanKhah Rahmani, Borna (Author) ; Khaloo, Alireza (Supervisor)
    Abstract
    Even though a considerable amount of research has been conducted on composite wall system during past years, very limited research has been reported on shear walls strengthened by steel plates. In 2008, the composite shear wall, which consisted of reinforced concrete wall, retrofitted by steel plates, attached to both sides of RC walls using mechanical connectors in form of shear studs, bolts or lateral ties tested under axial load and lateral force. In this research, seismic behavior of RC shear walls strengthened by vertical strips of steel plates is going to be studied. The result will be compared with RC shear wall which fully covered by steel plates. The behavior of RC shear wall will... 

    Formulation for Mechanical Modelling of Small-Scale Micro- and Nano- Beams and Plates for Statical and Vibrational Analysis Based on the Second Strain Gradient Theory

    , Ph.D. Dissertation Sharif University of Technology Momeni, Alireza (Author) ; Asghari, Mohsen (Supervisor) ; Vatankhah, Ramin (Co-Advisor)
    Abstract
    In this thesis, the formulation of beams and plates in the micro- and nano scales is presented based on the second strain gradient theory (SSGT) introduced by Mindlin. The SSGT is a non-classical continuum theory that includes the second-order gradients of strain tensor in its formulation and this leads to more accurate modeling for mechanical behavior of materials than the strain gradient theory. On the other hand, due to the ever-increasing use of micro- and nano-electromechanical systems, analysis of the mechanical behavior of their deformable components for design and construction is of particular importance. For this purpose, analysis of Timoshenko beams and Euler-bernoulli beams made... 

    Boundary Control of Vibration in Satellite Flexible Solar Panels

    , M.Sc. Thesis Sharif University of Technology Kaviani Rad, Hossein (Author) ; Alasty, Aria (Supervisor) ; Salarieh, Hassan (Supervisor) ; Vatankhah, Ramin (Co-Advisor)
    Abstract
    Many spacecrafts and satellites have long flexible components, the most common ones are the satellites with flexible solar panels, which are used to provide the satellite energy. The governing equations of the satellite rigid motion along with the solar panels vibrations are the combination of the coupled partial and ordinary differential equations. Various reasons, such as the satellite maneuvers and the external disturbances, cause the vibration of panels. Due to the dependence between the governing equations of the satellite rigid motion and the flexible components vibrations, these vibrations affect the satellite rigid dynamics and the control aims; therefore, in addition to the... 

    Design and Simulation of a Passive Microfluidic Device for Particle Separation

    , M.Sc. Thesis Sharif University of Technology Vatankhah, Parham (Author) ; Shamloo, Amir (Supervisor)
    Abstract
    Nowadays, separation and filtration of particles has many industrial applications in biology and medicine. In this thesis, passive microfluidics are designed and simulated which are able to separate and filter particles. Although particles aer generally expected to follow laminar flow streamlines in the absence of external forces, inertial forxes van cause particles to migrate across mictochannels in an accurate and predictable manner. The effect of these forces is invedtigated, and by using previous research, a model is developed to predict these forces. First design is a microchannel with Archimedean spiral which utilizes both inertial forces and Dean flow to separate particles in the... 

    Vibration Boundary Control in Micro-beams Equipped with a Layer of Piezoelectric Actuator

    , M.Sc. Thesis Sharif University of Technology (Author) ; Salarieh, Hassan (Supervisor) ; Alasti, Aria (Supervisor) ; Vatankhah, Ramin ($item.subfieldsMap.e)
    Abstract
    Nowadays, micro systems in many area of science and technology have special importance and status. The main function of these systems is based on the deformation of a beam at micro scale. Therefore study of behavior and control of micro-beams will have a great importance. Among micro-beams, clamped-free and clamped-clamped micro beams that actuated by piezoelectric and electrostatic actuators have wider applications. For example, clamped-free micro-beams are used in atomic force microscopy (AFM), micro switches, mass sensors and micro-accelerometers and clamped-clamped micro-beams are used in micro mirrors and Grating Light Valves (GLV). In this thesis, the studied system is clamped-free... 

    Passage-Way Identification and Crossing Control of an Experimental Swarm Robot

    , M.Sc. Thesis Sharif University of Technology Balaghi Enalou, Mohammad Hadi (Author) ; Alasti, Aria (Supervisor) ; Vatankhah, Ramin (Co-Advisor)
    Abstract
    The aim of the proposed thesis is to devise a method of passage-way identification and crossing control of an experimental swarm robot. In the previous works done in the Sharif University of Technology, The main focus was on the collective behaviours than can be emeged from a swarm robot. Collective behaviours are such a primitive behaviours that are combined in order to lead to a real mission. In this investigation, the main focus is on the design of a mission. In this way, by combining the aggregation-divegance, chain formation, leader following and wall following collective behaviours, the desired is fulfilled. The algorithms is so that in the first stage, the agents of the swarm... 

    Formulation of Geometrically Nonlinear Microbeams Based on the Second Strain Gradient Theory

    , M.Sc. Thesis Sharif University of Technology Karparvarfard, Mohammad Hassan (Author) ; Asghari, Mohsen (Supervisor) ; Vatankhah, Ramin (Supervisor)
    Abstract
    Nowadays, the usage of beam-shaped structures has widely spread in micro- and nano-electromechanical systems; consequently, scholars are extremely interested in precise modeling of static and dynamic behaviors of them. As the beams utilized in MEMS and NEMS structures have thicknesses in the order of microns and sub-microns, the experimentally validated small scale effects would be considerable in their behavior. In fact, experiments manifest that the size-dependent behavior is an intrinsic feature of materials when they are used in small-scale structures. In the classical continuum mechanics, there exists no material length scale parameter. Thus, the classical theory is unable to capture... 

    Vibration Control of Nonclassical Microbeams Using Boundary Control Theory of Partial Differential Equations

    , Ph.D. Dissertation Sharif University of Technology Vatankhah, Ramin (Author) ; Alasty, Aria (Supervisor)
    Abstract
    Nowadays, continuous systems such as strings, bars, beams and plates have become widespread in science and engineering applications. To achieve the control purposes of continuous systems, most of engineers use discretization techniques to reduce the governing partial differential equation (PDE) into a set of ordinary differential equations (ODEs). From practical point of view, this model reduction can cause many problems such as in-domain measurement and actuation and control spillover. This thesis attempts to investigate the problem of vibration control of nonclassical microscale beams using the partial differential equation control theory which eliminates spillover instabilities. To this... 

    Control and Optimization of Robotic Swarm Flocking Using Naturally Inspired Methods

    , M.Sc. Thesis Sharif University of Technology Vatankhah, Ramin (Author) ; Alasty, Aria (Supervisor)
    Abstract
    The idea of using groups of simple autonomous robots instead of one or limited number of very sophisticated robots is inspired by flocking behaviors of animals. Distributed control structures and artificial swarming have attracted lots of studies in robotics. There are many applications for robotic swarms in which members are very simple robots with low communication capabilities. These robots communicate only within very limited distances. In this thesis, a homogenous robotic swarm with at least two robots is assumed. Swarm robots are considered to be dimensionless with no time delay, which is a normal assumption in this field of studies. Robots move in planar space and their behaviors are... 

    Homoleptic tetraazaphenanthrene-based copper(I) complexes: Synthesis, spectroscopic characterization, crystal structures and computational studies

    , Article Inorganica Chimica Acta ; Vol. 423, issue. PA , 2014 , pp. 348-357 ; ISSN :0020-1693 Kia, R ; Scholz, M ; Raithby, P. R ; Techert, S ; Sharif University of Technology
    2014
    Abstract
    Three new Cu(I) complexes containing bidentate N^N donor ligands with the general formula [Cu(N^N)2][PF6] (N^N = 2,3-diphenyl-6,7-di-p-tolyl-1,4,5,8-tetraazaphenanthrene (L1), 2,3-diphenyl-6,7-di(2-thienyl)-1,4,5,8-tetraazaphenanthrene (L2), and 2,3-diphenyl-6,7-di-p-fluorophenyl-1,4,5,8-tetraazaphenanthrene (L3), were prepared by the reaction of [Cu(CH3CN)4][PF6] with two equivalents of the N^N ligand. Single-crystal X-ray diffraction analysis confirmed that in each complex the metal displays a distorted tetrahedral geometry surrounded by the four N atoms of the two sterically hindered substituted tetraazaphenanthrene (TAP) ligands. Density functional theory (DFT) and time-dependent density... 

    Electromechanical resonators based on electrospun ZnO nanofibers

    , Article Journal of Micro/ Nanolithography, MEMS, and MOEMS ; Vol. 13,Issue. 4 , 2014 ; ISSN: 19325150 Fardindoost, S ; Mohammadi, S ; Zad, A. I ; Sarvari, R ; Shariatpanahi, S. P ; Sharif University of Technology
    2014
    Abstract
    We present fabrication, characterization, and experimental results describing electrical actuation and readout of the mechanical vibratory response of electrospun ZnO nanofibers. For a fiber with an approximate radius of 200 nm and a length of 70 ìm, a resonance frequency around 3.62 MHz with a quality factor (Q) of about 235 in air at ambient conditions is observed. It is shown that the measured frequency of the resonance is consistent with results from finite element simulations. Also, the measurements were performed in an enclosed chamber with controlled levels of ethanol vapor. The adsorption of ethanol causes a shift in the resonance frequency of the fibers, which can be related to the... 

    Solid products characterization in a multi-step mineralization process

    , Article Chemical Engineering Journal ; Vol. 252 , 2014 , Pages 210-219 ; ISSN: 13858947 Hemmati, A ; Shayegan, J ; Sharratt, P ; Yeo, T. Y ; Bu, J
    2014
    Abstract
    In this paper, we describe a carbon dioxide mineralization process and its associated solid products. These solid products include amorphous silica, iron hydroxides and magnesium carbonates. These products were subjected to various characterization tests, and the results are published here. It was found that the iron hydroxides from this process can have different crystalline properties, and their formation depended very much on the pH of the reaction conditions. Different forms of magnesium carbonate were also obtained, and the type of carbonate precipitated was found to be dependent on the carbonation temperature. Hydromagnesite was obtained mainly at low temperatures, while dypingite was... 

    Physical properties of the WASP-67 planetary system from multi-colour photometry

    , Article Astronomy and Astrophysics ; Vol. 568 , August , 2014 ; ISSN: 00046361 Mancini, L ; Southworth, J ; Ciceri, S ; Calchi Novati, S ; Dominik, M ; Henning, Th ; Jorgensen, U. G ; Korhonen, H ; Nikolov, N ; Alsubai, K. A ; Bozza, V ; Bramich, D. M ; D'Ago, G ; Figuera Jaimes, R ; Galianni, P ; Gu, S. H ; Harpsoe, K ; Hinse, T. C ; Hundertmark, M ; Juncher, D ; Kains, N ; Popovas, A ; Rabus, M ; Rahvar, S ; Skottfelt, J ; Snodgrass, C ; Street, R ; Surdej, J ; Tsapras, Y ; Vilela, C ; Wang, X. B ; Wertz, O ; Sharif University of Technology
    2014
    Abstract
    Context. The extrasolar planet WASP-67 b is the first hot Jupiter definitively known to undergo only partial eclipses. The lack of the second and third contact points in this planetary system makes it difficult to obtain accurate measurements of its physical parameters  

    Studies of dijet transverse momentum balance and pseudorapidity distributions in pPb collisions at √sNN = 5.02 TeV

    , Article European Physical Journal C ; Vol. 74, issue. 7 , July , 2014 ; ISSN: 14346044 The CMS Collaboration ; Chatrchyan, S ; Khachatryan, V ; Sirunyan, A. M ; Tumasyan, A ; Adam, W ; Bergauer, T ; Dragicevic, M ; Ero, J ; Fabjan, C ; Friedl, M ; Fruhwirth, R ; Ghete, V. M ; Hartl, C ; Hrubec, J ; Hormann, N ; Jeitler, M ; Kiesenhofer, W ; Knunz, V ; Krammer, M ; Kratschmer, I ; Liko, D ; Mikulec, I ; Rabady, D ; Rahbaran, B ; Rohringer, H ; Schofbeck, R ; Strauss, J ; Taurok, A ; Treberer-Treberspurg, W ; Waltenberger, W ; Wulz, C. E ; Mossolov, V ; Shumeiko, N ; Suarez Gonzalez, J ; Alderweireldt, S ; Bansal, M ; Bansal, S ; Cornelis, T ; De Wolf, E. A ; Janssen, X ; Knutsson, A ; Luyckx, S ; Mucibello, L ; Ochesanu, S ; Roland, B ; Rougny, R ; Van Haevermaet, H ; Van Mechelen, P ; Van Remortel, N ; Sharif University of Technology
    2014
    Abstract
    Dijet production has been measured in pPb collisions at a nucleon–nucleon centre-of-mass energy of 5.02 TeV. A data sample corresponding to an integrated luminosity of 35 nb−1 was collected using the Compact Muon Solenoid detector at the Large Hadron Collider. The dijet transverse momentum balance, azimuthal angle correlations, and pseudorapidity distributions are studied as a function of the transverse energy in the forward calorimeters (E4<|η|<5.2 T). For pPb collisions, the dijet transverse momentum ratio and the width of the distribution of dijet azimuthal angle difference are comparable to the same quantities obtained from a simulated pp reference and insensitive to E4<|η|<5.2 T. In... 

    Process optimization for mineral carbonation in aqueous phase

    , Article International Journal of Mineral Processing ; Vol. 130 , July , 2014 , pp. 20-27 ; ISSN: 03017516 Hemmati, A ; Shayegan, J ; Bu, J ; Yeo, T. Y ; Sharratt, P ; Sharif University of Technology
    2014
    Abstract
    Carbon dioxide sequestration by a pH-swing carbonation process was considered in this work. A multi-step aqueous process is described for the fractional precipitation of magnesium carbonate and other minerals in an aqueous system at room temperature and atmospheric pressure. With the aim to achieve higher purity and deliver more valuable mineral products, the process was split into four steps. The first step consists of Mg leaching from the magnesium silicate in a stirred vessel using 1 M HCl at 80 °C, followed by a three step precipitation in reactors in sequence to remove Fe(OH)3, then Fe(OH)2 and other divalent ions, and finally MgCO3 nucleation and growth. Hydrated magnesium carbonate... 

    Search for excited quarks in the γ + jet final state in proton-proton collisions at √s=8TeV

    , Article Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics ; Vol. 738, issue , 2014 , pp. 274-293 Khachatryan, V ; Sirunyan, A. M ; Tumasyan, A ; Adam, W ; Bergauer, T ; Dragicevic, M ; Ero, J ; Fabjan, C ; Friedl, M ; Fruhwirth, R ; Ghete, V. M ; Hartl, C ; Hormann, N ; Hrubec, J ; Jeitler, M ; Kiesenhofer, W ; Knunz, V ; Krammer, M ; Kratschmer, I ; Liko, D ; Mikulec, I ; Rabady, D ; Rahbaran, B ; Rohringer, H ; Schofbeck, R ; Strauss, J ; Taurok, A ; Treberer Treberspurg, W ; Waltenberger, W ; Wulz, C. E ; Mossolov, V ; Shumeiko, N ; Suarez Gonzalez, J ; Alderweireldt, S ; Bansal, M ; Bansal, S ; Cornelis, T ; De Wolf, E. A ; Janssen, X ; Knutsson, A ; Luyckx, S ; Ochesanu, S ; Roland, B ; Rougny, R ; Van De Klundert, M ; Van Haevermaet, H ; Van Mechelen, P ; Van Remortel, N ; Van Spilbeeck, A ; Blekman, F ; Sharif University of Technology
    2014
    Abstract
    A search for excited quarks decaying into the γ + jet final state is presented. The analysis is based on data corresponding to an integrated luminosity of 19.7 fb-1 collected by the CMS experiment in proton-proton collisions at √s=8TeV at the LHC. Events with photons and jets with high transverse momenta are selected and the γ + jet invariant mass distribution is studied to search for a resonance peak. The 95% confidence level upper limits on the product of cross section and branching fraction are evaluated as a function of the excited quark mass. Limits on excited quarks are presented as a function of their mass and coupling strength; masses below 3.5 TeV are excluded at 95% confidence... 

    Search for top-squark pairs decaying into Higgs or Z bosons in pp collisions at √s=8 TeV

    , Article Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics ; Vol. 736 , 2014 , Pages 371-397 ; ISSN: 03702693 Khachatryan, V ; Sirunyan, A. M ; Tumasyan, A ; Adam, W ; Bergauer, T ; Dragicevic, M ; Ero, J ; Fabjan, C ; Friedl, M ; Fruhwirth, R ; Ghete, V. M ; Hartl, C ; Hormann, N ; Hrubec, J ; Jeitler, M ; Kiesenhofer, W ; Knunz, V ; Krammer, M ; Kratschmer, I ; Liko, D ; Mikulec, I ; Rabady, D ; Rahbaran, B ; Rohringer, H ; Schofbeck, R ; Strauss, J ; Taurok, A ; Treberer Treberspurg, W ; Waltenberger, W ; Wulz, C. E ; Mossolov, V ; Shumeiko, N ; Suarez Gonzalez, J ; Alderweireldt, S ; Bansal, M ; Bansal, S ; Cornelis, T ; De Wolf, E. A ; Janssen, X ; Knutsson, A ; Luyckx, S ; Ochesanu, S ; Roland, B ; Rougny, R ; Van De Klundert, M ; Van Haevermaet, H ; Van Mechelen, P ; Van Remortel, N ; Van Spilbeeck, A ; Blekman, F ; Sharif University of Technology
    2014
    Abstract
    A search for supersymmetry through the direct pair production of top squarks, with Higgs (H) or Z bosons in the decay chain, is performed using a data sample of proton-proton collisions at s=8 TeV collected in 2012 with the CMS detector at the LHC. The sample corresponds to an integrated luminosity of 19.5 fb-1. The search is performed using a selection of events containing leptons and bottom-quark jets. No evidence for a significant excess of events over the standard model background prediction is observed. The results are interpreted in the context of simplified supersymmetric models with pair production of a heavier top-squark mass eigenstate t~2 decaying to a lighter top-squark mass... 

    Measurement of the ratio B(t→Wb)/B(t→Wq) in pp collisions at s=8 TeV

    , Article Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics ; Vol. 736 , 2014 , Pages 33-57 ; ISSN: 03702693 Khachatryan, V ; Sirunyan, A. M ; Tumasyan, A ; Adam, W ; Bergauer, T ; Dragicevic, M ; Ero, J ; Fabjan, C ; Friedl, M ; Fruhwirth, R ; Ghete, V. M ; Hartl, C ; Hormann, N ; Hrubec, J ; Jeitler, M ; Kiesenhofer, W ; Knunz, V ; Krammer, M ; Kratschmer, I ; Liko, D ; Mikulec, I ; Rabady, D ; Rahbaran, B ; Rohringer, H ; Schofbeck, R ; Strauss, J ; Taurok, A ; Treberer Treberspurg, W ; Waltenberger, W ; Wulz, C. E ; Mossolov, V ; Shumeiko, N ; Suarez Gonzalez, J ; Alderweireldt, S ; Bansal, M ; Bansal, S ; Cornelis, T ; De Wolf, E. A ; Janssen, X ; Knutsson, A ; Luyckx, S ; Ochesanu, S ; Roland, B ; Rougny, R ; Van De Klundert, M ; Van Haevermaet, H ; Van Mechelen, P ; Van Remortel, N ; Van Spilbeeck, A ; Blekman, F ; Sharif University of Technology
    2014
    Abstract
    The ratio of the top-quark branching fractions R=B(t→Wb)/B(t→Wq), where the denominator includes the sum over all down-type quarks (q = b, s, d), is measured in the tt- dilepton final state with proton-proton collision data at s=8 TeV from an integrated luminosity of 19.7 fb-1, collected with the CMS detector. In order to quantify the purity of the signal sample, the cross section is measured by fitting the observed jet multiplicity, thereby constraining the signal and background contributions. By counting the number of b jets per event, an unconstrained value of R=1.014±0.003(stat.)±0.032(syst.) is measured, in a good agreement with current precision measurements in electroweak and flavour... 

    Constraints on the Higgs boson width from off-shell production and decay to Z-boson pairs

    , Article Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics ; Vol. 736 , 2014 , Pages 64-85 ; ISSN: 03702693 Khachatryan, V ; Sirunyan, A. M ; Tumasyan, A ; Adam, W ; Bergauer, T ; Dragicevic, M ; Ero, J ; Fabjan, C ; Friedl, M ; Fruhwirth, R ; Ghete, V. M ; Hartl, C ; Hormann, N ; Hrubec, J ; Jeitler, M ; Kiesenhofer, W ; Knunz, V ; Krammer, M ; Kratschmer, I ; Liko, D ; Mikulec, I ; Rabady, D ; Rahbaran, B ; Rohringer, H ; Schofbeck, R ; Strauss, J ; Taurok, A ; Treberer Treberspurg, W ; Waltenberger, W ; Wulz, C. E ; Mossolov, V ; Shumeiko, N ; Suarez Gonzalez, J ; Alderweireldt, S ; Bansal, M ; Bansal, S ; Cornelis, T ; De Wolf, E. A ; Janssen, X ; Knutsson, A ; Luyckx, S ; Ochesanu, S ; Roland, B ; Rougny, R ; Van De Klundert ,M ; Van Haevermaet, H ; Van Mechelen, P ; Van Remortel, N ; Van Spilbeeck, A ; Blekman, F ; Sharif University of Technology
    2014
    Abstract
    Constraints are presented on the total width of the recently discovered Higgs boson, ΓH, using its relative on-shell and off-shell production and decay rates to a pair of Z bosons, where one Z boson decays to an electron or muon pair, and the other to an electron, muon, or neutrino pair. The analysis is based on the data collected by the CMS experiment at the LHC in 2011 and 2012, corresponding to integrated luminosities of 5.1fb -1 at a center-of-mass energy s=7TeV and 19.7fb -1 at s=8TeV. A simultaneous maximum likelihood fit to the measured kinematic distributions near the resonance peak and above the Z-boson pair production threshold leads to an upper limit on the Higgs boson width of ΓH...