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    The effect of geometry on structural behavior of buildings with steel plate shear wall system subjected to blast loading

    , Article International Journal of Steel Structures ; Volume 21, Issue 2 , 2021 , Pages 650-665 ; 15982351 (ISSN) Shabanlou, M ; Moghaddam, H ; Saedi Daryan, A ; Sharif University of Technology
    Korean Society of Steel Construction  2021
    Abstract
    Many important public buildings have suffered significant damages due to terrorist attacks in the last few decades. This paper investigates the behavior of structures with steel plate shear wall lateral load resisting system under various blast loadings. A number of twenty steel frames with different heights and widths subjected to four different blast scenarios are modeled and analyzed in opensees software. The results showed that structures with steel plate shear wall systems subjected to blast loading have better behavior in high-rise structures than in low-rise structures in terms of drift and ductility ratio. The steel plate shear wall system exhibited shear-dominated,... 

    Size and layout optimum design of frames with steel plate shear walls by metaheuristic optimization algorithms

    , Article Structures ; Volume 48 , 2023 , Pages 657-668 ; 23520124 (ISSN) Saedi Daryan, A ; Salari, M ; Palizi, S ; Farhoudi, N ; Sharif University of Technology
    Elsevier Ltd  2023
    Abstract
    Optimization of a structure refers to a design procedure that results in the most economical structure in terms of materials and sizing of sections. In structures with steel plate shear walls, finding the best layout of the walls in a frame is also of priority in designing a structure with the minimum weight. Finding the least weight of a structure while all design provisions according to codes and standards are satisfied is a challenging task that is hard to perform with the existing design methods. Metaheuristic optimization algorithms are robust computational tools used for solving complex problems, which are used widely in many engineering fields, especially structural engineering. This... 

    Critical temperature evaluation of moment frames by means of plastic analysis theory and genetic algorithm

    , Article Iranian Journal of Science and Technology - Transactions of Civil Engineering ; 2021 ; 22286160 (ISSN) Palizi, S ; Saedi Daryan, A ; Sharif University of Technology
    Springer Science and Business Media Deutschland GmbH  2021
    Abstract
    Nowadays, deliberate or unwanted fire incidents have created much attention to the behavior of structures against these types of events. Since the properties of structural members are influenced by the increase in the temperature of the members, it is more difficult to predict the general and local behavior of the structures during the fire. In this research, a method has been proposed to calculate the critical temperature in two-dimensional structures at its collapse with desirable accuracy. In this process, the upper-bound theory of plastic analysis is used. The plastic analysis is performed by applying the initial fire scenario to the structure, and its collapse load factor with the... 

    Critical temperature evaluation of moment frames by means of plastic analysis theory and genetic algorithm

    , Article Iranian Journal of Science and Technology - Transactions of Civil Engineering ; Volume 46, Issue 2 , 2022 , Pages 843-856 ; 22286160 (ISSN) Palizi, S ; Saedi Daryan, A ; Sharif University of Technology
    Springer Science and Business Media Deutschland GmbH  2022
    Abstract
    Nowadays, deliberate or unwanted fire incidents have created much attention to the behavior of structures against these types of events. Since the properties of structural members are influenced by the increase in the temperature of the members, it is more difficult to predict the general and local behavior of the structures during the fire. In this research, a method has been proposed to calculate the critical temperature in two-dimensional structures at its collapse with desirable accuracy. In this process, the upper-bound theory of plastic analysis is used. The plastic analysis is performed by applying the initial fire scenario to the structure, and its collapse load factor with the... 

    Peer-to-Peer energy sharing among smart energy hubs in an integrated heat-electricity network

    , Article Electric Power Systems Research ; Volume 206 , 2022 ; 03787796 (ISSN) Daryan, A. G ; Sheikhi, A ; Ashouri Zadeh, A ; Sharif University of Technology
    Elsevier Ltd  2022
    Abstract
    By increasing the penetration level of the combined heat and power systems and demand response programs between energy consumers in the distribution network, the interaction between electricity and the natural gas network becomes more complicated. This paper proposes a peer-to-peer (P2P) energy sharing scheme for energy trading among Smart Energy Hubs (S.E. Hubs) which can trade both electrical and thermal energy with each other to reduce their cost and, reduce their dependency to gas and electricity utility companies. A two-stage energy strategy is presented. In the first stage, the S.E. Hubs total social cost is reduced by finding the optimal energy sharing profiles. And, in the second... 

    Conceptual design of a miniaturized hybrid local actuator for Minimally Invasive Robotic Surgery (MIRS) instruments

    , Article Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS ; 2011 , Pages 2140-2143 ; 1557170X (ISSN); 9781424441211 (ISBN) Saedi, S ; Mirbagheri, A ; Farahmand, F ; Sharif University of Technology
    2011
    Abstract
    The actuation mechanism of the tip of an endoscopic instrument is a major problem in designing miniature scale motorized instruments, especially when a high level of functionality and multi degrees of freedom (DOF) are concerned. We evaluated the different possible actuation methods for an endoscopic needle holder and proposed a new design of hybrid local-actuation, including a micro DC motor and a piezoelectric (PZT) actuator. The DC motor provided the long movement course required for opening-closing function of the gripper while the PZT guaranteed the high gripping force required for holding the needle. A compact serial configuration was considered for the actuators, producing an overall... 

    A study on mutual interaction between atomistic and macroscopic phenomena during electrochemical processes using FD-KMC model: Application to CV test in simple copper sulfate bath

    , Article Journal of Electroanalytical Chemistry ; Volume 592, Issue 1 , 2006 , Pages 95-102 ; 15726657 (ISSN) Saedi, A ; Sharif University of Technology
    Elsevier  2006
    Abstract
    A multiscale FD-KMC model has been developed to simulate the cyclic voltammetry test of a copper electrode in simple copper sulfate bath. In this coupled model, the FD code provides the cupric ion concentration on OHP for KMC code, while the KMC code provides the electrochemical properties of the copper electrode (surface activity and rate constants of redox reactions) as an input data for FD code. The changes in the electrode properties due to the atomistic phenomena (deposition dissolution and surface diffusion) have been studied for the present potentiodynamic system. The results showed that the CV process consists of some distinct stages, so that the electrode exhibits a specific... 

    A study on mutual interaction between atomistic and macroscopic phenomena during electrochemical processes using coupled finite difference - Kinetic Monte Carlo model: Application to potential step test in simple copper sulfate bath

    , Article Journal of Electroanalytical Chemistry ; Volume 588, Issue 2 , 2006 , Pages 267-284 ; 15726657 (ISSN) Saedi, A ; Sharif University of Technology
    Elsevier  2006
    Abstract
    A novel method is used to link a 2D kinetic Monte Carlo code to a 1D finite difference code to construct a more realistic and efficient tool for simulating various electrochemical processes. This multiscale model is able to simulate the long-scale mass transfer of electroactive species in bath along with electrode surface phenomena at atomic scale simultaneously. An embedded atom method (EAM) has been used to evaluate the barrier energies of diffusion and redox reactions on electrode surface. The FD code provides the ion concentration on OHP for KMC code, while the KMC code provides the surface activity and rate constants of redox reactions as an input data for FD code. The electrochemical... 

    On the growth sequence of highly ordered nanoporous anodic aluminium oxide

    , Article Materials and Design ; Volume 27, Issue 10 , 2006 , Pages 983-988 ; 02613069 (ISSN) Ghorbani, M ; Nasirpouri, F ; Iraji zad, A ; Saedi, A ; Sharif University of Technology
    Elsevier Ltd  2006
    Abstract
    Anodic aluminium oxide films were fabricated by well known two-step anodizing process in oxalic acid electrolyte. The ordering characteristics (ordered pore domains, average pore diameter size and through-pore arrangement) of anodic aluminium oxide films, obtained in different growth sequences, were identified by microscopic analysis such as ex situ contact-mode atomic force microcopy and scanning electron microscopy. Flattened areas in which some pits are seen mostly cover the electropolished surface of aluminium. Single anodizing of aluminium produces a broad distribution of nanopore size, whereas induces a highly ordered hemispherical pattern, which plays the ordered nucleation sites for... 

    Electrodeposition of Ni-Fe-Co alloy nanowire in modified AAO template

    , Article Materials Chemistry and Physics ; Volume 91, Issue 2-3 , 2005 , Pages 417-423 ; 02540584 (ISSN) Saedi, A ; Ghorbani, M ; Sharif University of Technology
    2005
    Abstract
    Anodic aluminum oxide (AAO) was used as a template to prepare highly ordered Ni-Fe-Co alloy nanowire arrays. This membrane was fabricated with two-step anodizing method. It is found that there is an optimum barrier thickness to obtain a successful electrodeposition in pores of AAO. The thickness of barrier layer can be modified by additional electrochemical process after completing the anodizing step. Barrier layer thinning can create a rooted structure at the bottom side of the AAO pores and the electrodeposited nanowire arrays. The triple Ni-Fe-Co alloy was deposited in AAO membrane by ac voltage in a simple sulfate bath. The composition of nanowires shows anomalous deposition features... 

    Pricing Behavior Indicators and the Factors Affecting It: Evidence from Refah Stores’ Price Micro Data

    , M.Sc. Thesis Sharif University of Technology Saedi, Masoumeh (Author) ; Madanizadeh, Ali (Supervisor)
    Abstract
    Price stickiness which is measured by indicators like frequency and duration of price changes affects how monetary policy plays a role in economy. In fact, price stickiness determines how monetary policy affects economy’s real variables like output and unemployment. Hence, price stickiness is in favor of monetary policy since it provides the ability to improve real variables in the short term. Discovering the factors affecting price adjustment also allows the monetary policymaker to be able to predict changes in pricing behavior to some extent by monitoring the changes of these influential factors. This study seeks to answer several questions using 84 million monthly price observations of... 

    Design and Implementation of Ka band Low Noise Amplifiers and Limiters

    , M.Sc. Thesis Sharif University of Technology Mahmoudi Daryan, Parisa (Author) ; Medi, Ali (Supervisor)
    Abstract
    Todays the use of microwave integrated circuits for military and commercial applications has gained much attention, especially with the advent of monolithic microwave integrated circuits, which provide the possibility of fabrication of amplifiers in large number, sufficient accuracy an affordable price.GaAs pHEMT process, because of good characteristics for noise and power in high frequencies, is a good choice for microwave and millimeter wave integrated circuits. A low noise amplifier is a key block in the receiver and, its noise figure and gain directly affects the sensitivity and dynamic range of the receiver. Hence, a low noise amplifier with low NF, high gain, good return loss, low... 

    Experimental study of Silver, Zinc and Copper ablation by Nd:YAG laser

    , M.Sc. Thesis Sharif University of Technology Khodadadi Daryan, Monireh (Author) ; Saddighi, Rasoul (Supervisor)
    Abstract
    In this project, production of nano and micro particles with laser ablation of zinc, silver and copper sheet metals in the liquid medium has been experimentally studied. For this aim, homemade Nd:YAG pulsed laser at 1064nm wavelength, 60μs pulses with excellent stability with energies up to 700mj is used. By changing the pulse intensity on the target surface, the parameters such as size, shape and optical properties of nano and micro particles are studied by UV-visible spectroscopy, DLS, and SEM techniques. In this work, by microsecond pulses of Nd:YAG and using measuring devices such as Coherent power /energy meter, the appropriate optical table, the related experiments are implemented.... 

    Free fall and controlled gravity drainage processes in fractured porous media: Laboratory and modelling investigation

    , Article Canadian Journal of Chemical Engineering ; Volume 93, Issue 12 , October , 2015 , Pages 2286-2297 ; 00084034 (ISSN) Saedi, B ; Ayatollahi, S ; Masihi, M ; Sharif University of Technology
    Wiley-Liss Inc  2015
    Abstract
    Gravity drainage is known to be one of the most effective methods for oil recovery in fractured reservoirs. In this study, both free fall and controlled gravity drainage processes were studied using a transparent fractured experimental model, followed by modelling using commercial CFD software. The governing equations were employed based on the Darcy and mass conservation laws and partial pressure formulation. Comprehensive examination was done on variables such as fluid saturation, velocity, and pressure distribution in the matrix and fracture, as well as fluid front level and production rate. Additionally, effects of the model parameters on the gravity drainage performance were... 

    Bundle pricing and inventory decisions on complementary products

    , Article Operational Research ; 2017 , Pages 1-25 ; 11092858 (ISSN) Taleizadeh, A. A ; Babaei, M. S ; Akhavan Niaki, S. T ; Noori daryan, M ; Sharif University of Technology
    Springer Verlag  2017
    Abstract
    Selling correlated products faces the sellers with the cross-selling, which is a key factor in managing revenue and costs of the sellers. Cross-selling is a phenomenon which happens when the demands of products are correlated so that the demand for one of the correlated products automatically initiates demand of another. In these cases, different selling tactics such as bundling, tying, mixed bundling, etc. are applied to sell the items. In this paper, an integrated pricing-inventory model for two complementary products under three selling strategies is developed. In the first model, it is assumed that the seller sells the products separately while those are packed and sold as bundling in... 

    Bundle pricing and inventory decisions on complementary products

    , Article Operational Research ; Volume 20, Issue 2 , 2020 , Pages 517-541 Taleizadeh, A. A ; Babaei, M. S ; Akhavan Niaki, S. T ; Noori daryan, M ; Sharif University of Technology
    Springer  2020
    Abstract
    Selling correlated products faces the sellers with the cross-selling, which is a key factor in managing revenue and costs of the sellers. Cross-selling is a phenomenon which happens when the demands of products are correlated so that the demand for one of the correlated products automatically initiates demand of another. In these cases, different selling tactics such as bundling, tying, mixed bundling, etc. are applied to sell the items. In this paper, an integrated pricing-inventory model for two complementary products under three selling strategies is developed. In the first model, it is assumed that the seller sells the products separately while those are packed and sold as bundling in... 

    Electrodeposition of platinum nanowires: Electrochemical characterization

    , Article ECS Transactions, 25 April 2010 through 30 April 2010 ; Volume 28, Issue 18 , April , 2010 , Pages 25-35 ; 19385862 (ISSN) ; 9781607681946 (ISBN) Mahshid, S. S ; Dolati, A ; Hashemi Daryan, S ; Ghorbani, M ; Ghahramaninezhad, A ; Physical and Analytical Electrochemistry ; Sharif University of Technology
    2010
    Abstract
    Platinum nanowires (PtNWs) were electrodeposited on the polycarbonate templates (PCTs) in aqueous solution of H2PtCl6 in triply distilled water. Nanowires with diameters of 50 and 100 nanometers were electrodeposited on the same condition. The kinetics of electrodeposition process was studied by electrochemical techniques such as voltammetry and chronoamperometry methods. Increasing the scan rate, the peaks shifted to more negative potentials and the current density also increased in each peak which was typical for a diffusion-control process. The potential range for the deposition of platinum nanowires was specified and consequently the potentiostatic i-t transients were utilized to produce... 

    Truss Section, Topology and Shape Optimization Considering Uncertainties

    , M.Sc. Thesis Sharif University of Technology Donyaie Daryan, Esmaiel (Author) ; Kazemi, Mohammad Taghi (Supervisor)
    Abstract
    Optimization and uncertainty are two main issues in the structure design. In engineering problems and specially the structure, loads are among those issues witch we cannot be commented definitively. The uncertainty also shows itself in material properties and structural shapes. Design optimization is inevitable in order to use resources effectively. In the past, structural design was based on experience and engineering judgment, which was conservative and sometimes structure weight was very high. But today, thanks to computers, high-volume calculations would not be out of reach. With considering uncertainty, we can have prosper sight toward constraints by maintaining proper distance from... 

    Estimation of Water/Oil Two-Phase Flow Functions in Porous Media using Meta-Heuristic Algorithms

    , M.Sc. Thesis Sharif University of Technology Saedi, Farhad (Author) ; Fatemi, Mobeen (Supervisor) ; Taghikhani, Vahid (Supervisor)
    Abstract
    Oil and gas production from oil reservoirs is significantly affected by rock and fluid properties. Relative permeability and capillary pressure are two key flow functions that are used in the numerical modeling of processes related to the porous environment of oil and gas reservoirs at the core scale and above. The use of incorrect relative permeability and capillary pressure curves can lead to inappropriate prediction of the future behavior of the reservoir, which in turn affects future management decisions. Due to the time-consuming nature of obtaining flow functions from the steady state method, history-matching techniques are generally used to estimate these functions as accurately as... 

    Peer-to-Peer Energy Sharing Optmization Among Smart Energy Hubs in an Integrated Heat-Electricity Network

    , M.Sc. Thesis Sharif University of Technology Ghaffari Daryan, Amir Reza (Author) ; Ranjbar, Ali Mohammad (Supervisor)
    Abstract
    With deployment of distributed generation such as photovoltaic (PV) and active prosumers along with demand response (DR) ability, new fields are being created for energy markets and they are moving towards a consumer-centric way. Peer-to-Peer (P2P) network is one of the top research focuses which many studies have been conducted recently. The P2P network is based on multi bilateral agreements between Prosumers that help each other to manage and balance the supply and demand of energy between each other. In this thesis, two important structures of P2P network, which are called community-based and fully-decentrilized, respectively based on MILP (mixed integer linear programing) and ADMM...