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    Prediction of CO2 equilibrium moisture content using least squares support vector machines algorithm

    , Article Petroleum and Coal ; Volume 58, Issue 1 , 2016 , Pages 27-46 ; 13377027 (ISSN) Ghiasi, M.M ; Abdi, J ; Bahadori, M ; Lee, M ; Bahadori, A ; Sharif University of Technology
    Slovnaft VURUP a.s  2016
    Abstract
    The burning of fossil fuels such as gasoline, coal, oil, natural gas in combustion reactions results in the production of carbon dioxide. The phase behavior of the carbon dioxide + water system is complex topic. Unlike methane, CO2 exhibits a minimum in the water content. These minima cannot be predicted by existing methods accurately. In this communication, two mathematical-based procedures have been proposed for accurate computation of CO2 water content for tempe-ratures between 273.15 and 348.15 K and the pressure range between 0.5 and 21 MPa. The first is based on least squares support vector machine (LSSVM) algorithm and the second applies multilayer perceptron (MLP) artificial neural... 

    Reduction of cement consumption by the aid of silica nano-particles (investigation on concrete properties)

    , Article Journal of Civil Engineering and Management ; Volume 18, Issue 3 , 2012 , Pages 416-425 ; 13923730 (ISSN) Bahadori, H ; Hosseini, P ; Sharif University of Technology
    2012
    Abstract
    In this study, effects of replacing cement with colloidal amorphous silica nano-particles have been experimentally investigated on the physical and mechanical properties, durability and microstructure of concrete. Experimental results include workability, fresh concrete density, and hardened concrete properties like compressive strength at different ages of 3, 7, and 28-days, and also 28-days splitting tensile strength. Furthermore, influence of silica nano-particles on durability and microstructure of concrete for 28-days specimens was tested by conducting water absorption test, Scanning Electron Microscopy (SEM), and Energy Dispersive X-ray Analysis (EDAX), respectively. In order to study... 

    Multi-Conductor Transmission Line Models for Analysis of Metal-Dielectric -Metal Nanoplasmonic Structures

    , M.Sc. Thesis Sharif University of Technology Bahadori, Meisam (Author) ; Mehrany, Khashayar (Supervisor)
    Abstract
    The existing transmission line models of plasmonic nanostructures are modified in this thesis to study the electromagnetic characteristics of nano-plasmonic structures in a more efficeint yet accurate enough fashion. First, rectangular plasmonic cavities made by carving dielectric rectangles within a metallic region are modeled by trasnmission lines of finite length being appropriately terminated at their both ends. The resonance conditon in the proposed model yeilds the resonance frequencies, quality factors, and mode profiles of its correspondig plasmonic resonator. The accuracy of the proposed model is assessed by using the fully numerical finite-difference time-domain method (FDTD)... 

    Analysis of a Two-Echelon Queuing-Inventory System with M/M/c Product System

    , M.Sc. Thesis Sharif University of Technology Bahadori, Amirkhosro (Author) ; Hajji, Alireza (Supervisor)
    Abstract
    The subject of this thesis is a two-echelon inventory system with a manufacturer and multiple distribution centers (DCs) that satisfy the demand originating from multiple sources. Demand from each source follows an independent Poisson process. The transportation times between the manufacturer and the DCs are assumed to be positive which may require keeping inventory at both the warehouse and the DCs. Inventory in both echelons is managed using the base-stock policy. The manufacturer works with
    M/M/c product system. The cost of demand fulfillment for each DC consists of inventory holding and backlog costs. The objective is to determine the optimal base-stock levels at the DC  

    Cooling of gas turbines inlet air through aquifer thermal energy storage

    , Article 2006 ASME Power Conference, Atlanta, GA, 2 May 2006 through 4 May 2006 ; Volume 2006 , 2006 ; 0791837769 (ISBN); 9780791837764 (ISBN) Bahadori, M. N ; Behafarid, F ; Sharif University of Technology
    2006
    Abstract
    The power output of gas turbines reduces greatly with the increase of inlet air temperature. Aquifer thermal energy storage (ATES) is employed for cooling of the inlet air of a gas turbine. Water from a confined aquifer is cooled in winter, and is injected back into the aquifer. The stored chilled water is withdrawn in summer to cool the gas turbine inlet air. The heated water is then injected back into the aquifer. A 20 MW Hitachi gas turbine, along with a two-well aquifer were considered for analysis. It was shown that the minimum power output of the gas turbine on the warmest day of the year could be raised from 16.30 to 20.05 MW, and the mean annual power output could be increased from... 

    Coefficient of performance of mono-and multi-crystalline silicon photovoltaic panels

    , Article Solar World Congress 2005: Bringing Water to the World, Including 34th ASES Annual Conference and 30th National Passive Solar Conference, Orlando, FL, 6 August 2005 through 12 August 2005 ; Volume 2 , 2005 , Pages 1045-1050 ; 9781622762637 (ISBN) Bahadori, M. N ; Zamzamian, K ; Sharif University of Technology
    2005
    Abstract
    The coefficient of performance (COP) of a photovoltaic panel or module is defined as the ratio of the total electrical energy produced by the panel during its life to the total energy spent for its manufacture. All processes involved for the manufacture of photovoltaic panels were considered and the energy spent per unit mass of the final product during each process was determined. The total electrical energy spent for the manufacture of a photovoltaic module of 1×0.5 m dimensions, employing 340 micron wafers, with the net wafer area of 0.36 m2, was then determined. Monocrystalline and multicrystalline silicon cells were employed. It was found that for the manufacture of the PV module... 

    A circuit model for analysis of metal-insulator-metal plasmonic complementary split-ring resonators

    , Article Journal of Lightwave Technology ; Vol. 32, issue. 15 , August , 2014 , pp. 2659-2665 ; ISSN: 07338724 Bahadori, M ; Eshaghian, A ; Mehrany, K ; Sharif University of Technology
    2014
    Abstract
    A circuit model based on the transmission line theory is proposed to analyze the recently introduced metal-insulator-metal (MIM) complementary split-ring resonators (CSRRs). It is shown that integer and noninteger modes of CSRRs can be characterized by transmission line models with short- and open-circuited terminals. The proposed circuit model is then extended to incorporate side-coupling effects between the CSRRs and straight MIM waveguides. Thereby, simple closed-form expressions are provided for the coupling quality factor. It is shown that waveguide resonator structures based on CSRRs at specific resonance frequency and bandwidth can be smaller than waveguide resonator structures based... 

    Sky clearness index for Iranian cities

    , Article Solar World Congress 2005: Bringing Water to the World, Including 34th ASES Annual Conference and 30th National Passive Solar Conference, Orlando, FL, 6 August 2005 through 12 August 2005 ; Volume 3 , 2005 , Pages 1948-1952 ; 9781622762637 (ISBN) Bahadori, N. N ; Mirhosseini, S. A ; Sharif University of Technology
    2005
    Abstract
    The mean monthly values of sky clearness index, K̄T, were estimated for 36 Iranian cities, utilizing the solar radiation data measured by the Iranian Meteorological Organization. The study shows that the city of Tabas, in the desert regions of Iran, with an annual average K̄T of 0.69 is the sunniest city, followed by the cities of Yazd, Khor, Birjand, Khorramabad, Kerman, and Shiraz. On the other hand, the cities of Babolsar, Gorgan, Ramsar and Rasht, located by the Caspian Sea with average values of K̄T of 0.41, 0.41, 0.39 and 0.39, respectively, are the cloudiest cities in Iran  

    Design and Implementation of a Multi-Standard Crypto-Processor

    , M.Sc. Thesis Sharif University of Technology Bahadori, Milad (Author) ; Sharif Khani, Mohammad (Supervisor)
    Abstract
    The crypto-processors are used for encryption and decryption of the sensitive and important information. A crypto-processor converts input plaintext to ciphertext by an input key using a particular cryptographic algorithm. It also converts ciphertext to plaintext by the same or another key. Cryptographic standards are divided in two types: symmetric key algorithms (private key) and asymmetric key algorithms (public key). Current processors generally support only one or a few number of cryptographic algorithms. The motivation of this project is design and implementation of a multi-standard crypto-processor which supports the most of symmetric and asymmetric cryptographic algorithms, such as... 

    Prediction of phase equilibrium of CO2/cyclic compound binary mixtures using a rigorous modeling approach

    , Article Journal of Supercritical Fluids ; Vol. 90 , 2014 , pp. 110-125 ; ISSN: 08968446 Mesbah, M ; Soroush, E ; Shokrollahi, A ; Bahadori, A ; Sharif University of Technology
    2014
    Abstract
    Vapor liquid equilibrium (VLE) data has significant role in designing processes which include vapor and liquid in equilibrium. Since it is impractical to measure equilibrium data at any desired temperature and pressure, particularly near critical region, thermodynamic models based on equation of state (EOS) are usually used for VLE estimating. In recent years due to the development of numerical tools like artificial intelligence methods, VLE prediction has been find new alternatives. In the present study a novel method called Least-Squares Support Vector Machine (LSSVM) used for predicting bubble/dew point pressures of binary mixtures containing carbon dioxide (CO 2) + cyclic compounds as... 

    Producing functional recombinant human keratinocyte growth factor in Pichia pastoris and investigating its protective role against irradiation

    , Article Enzyme and Microbial Technology ; Volume 111 , April , 2018 , Pages 12-20 ; 01410229 (ISSN) Bahadori, Z ; Kalhor, H. R ; Mowla, S. J ; Sharif University of Technology
    Elsevier Inc  2018
    Abstract
    Keratinocyte Growth Factor (KGF) is a paracrine-acting, epithelial mitogen that plays a prominent role in the regeneration of damaged epithelial tissues. In spite of different attempts to produce recombinant human KGF in many organisms, including bacteria, mammalian cells, plant cells and insect cells; production of recombinant form suffers from lower yields and recovery relative to other recombinant proteins of similar size and properties. Due to many advantages of Pichia pastoris expression systems for producing industrial enzymes and pharmaceutical proteins, in this study P. pastoris was chosen as a host for KGF expression. For preparing human KGF coding sequence, MCF-7 cell line was... 

    Experimental investigation of new designs of wind towers

    , Article Renewable Energy ; Volume 33, Issue 10 , 2008 , Pages 2273-2281 ; 09601481 (ISSN) Bahadori Nejad , M ; Mazidi, M ; Dehghani, A. R ; Sharif University of Technology
    2008
    Abstract
    Two new designs of wind towers were tested side by side with a conventional wind tower in the city of Yazd, Iran. All the towers were of identical dimensions. The two new designs were one with wetted column, consisting of wetted curtains hung in the tower column, and the other one with wetted surfaces, consisting of wetted evaporative cooling pads mounted at its entrance. The air temperature leaving the wind towers with evaporative cooling provisions were much lower than the air temperature leaving the conventional design, and its relative humidity much higher. The air-flow rate was reduced slightly in these new towers. It was found that the wind tower with wetted column performs better with... 

    Recovery of Pure Magnesium Oxide from Brine Sources

    , M.Sc. Thesis Sharif University of Technology Bahadori, Babak (Author) ; Askari, Masoud (Supervisor) ; Nosheh, Mohammad (Co-Advisor)
    Abstract
    Today a significant portion of the world magnesia supply is produced by approximately 20 manufacturers by precipitation of magnesium hydroxide either from seawater or brine sources, which amounts to about 14% of the world magnesia production. The first synthetic magnesia production occurred along the French coast of the Mediterranean Sea, near Aiques-Mortes, operating sometime before 1885. Magnesium hydroxide was precipitated from seawater by reacting it with milk of lime in a continuous fashion using three sequential agitated reactors. Because of the abundance of brine resources enrich in Magnesium in our country, in this project, was tried to precipitate Magnesium Hydroxide from brine... 

    The Impact of Managers on Firm Performance and Policies

    , M.Sc. Thesis Sharif University of Technology Bahadori, Niloofar (Author) ; Barakchian, Mahdi (Supervisor) ; Ebrahimnejad, Ali (Supervisor)
    Abstract
    The aim of this paper is to investigate the effects of Iranian Chief Executive Managers and board of directors on the outcomes of their firms. First, by exploiting the information about changes in the combination of managers in 488 firms in Tehran Stock Exchange and Iran Fara Bourse, this study seeks to give an insight about managers’ labor market in Iran. Then, after combining these data with the obtained information from the firms’ financial statements, we run a set of regressions to identify whether managers have significant effect on the firms’ behaviors and performance. The results of this investigation show that a significant portion of changes in firms’ outcomes can be explained by... 

    Self-Leadership Strategies in Teamwork and Share Leadership Orientation with the Mediating Effect of Self-Efficacy

    , M.Sc. Thesis Sharif University of Technology karbasforushan, Elias (Author) ; Alavi, Babak (Supervisor)
    Abstract
    The main purpose of this study is to evaluate the linkage between two constructs about teamwork activities. One of them is "self-leadership in teamwork", the extent to which a person could control and manage his thoughts and activities in teamwork. The other is "shared leadership orientation", which is about orientation of people to contribute in leadership processes. This linkage evaluated with consideration of "self-efficacy in shared leadership" as a moderator.
    Questionnaires of self-leadership in teamwork and self-efficacy in shared leadership elicited from literature with a little change and shared leadership questionnaire developed in another study by the author.Questionnaires... 

    The Hidden Side of Coin: What Self Leadership Strategies Are Applied by Successful Iranian Women Entrepreneurs?

    , M.Sc. Thesis Sharif University of Technology Mirhosseini, Minoo (Author) ; Alavi, Babak (Supervisor)
    Abstract
    Women are going to play more important roles in the economy of most countries including Iran. Hence, since the number of entrepreneurs among women is increasing, identifying characteristics and other factors that cause these group to be successful, is a critical issue. Studies show that entrepreneurs, especially women entrepreneurs, face numerous problems in their career. These problems are especially more demanding in societies with unique cultural attributes. Therefore, applying personal and managerial solutions in order to overcome these problems are necessary. On the other hand, researchers believe that one of the most effective and beneficial concepts helping entrepreneurs in their... 

    Identifying the Ethical Dilemmas Confronting Human Resource Managers of Iranian Project Based Companies and Exploring their Causes

    , M.Sc. Thesis Sharif University of Technology Shokatian, Taha (Author) ; Alavi, Babak (Supervisor)
    Abstract
    The present study was performed aiming to identify the ethical dilemmas human resource managers confront with in Iranian project-based organizations as well as to trace out the underlying causes. “Ethical dilemma” refers to a decision making situation in which ethical considerations render all the alternatives inapt, thence making the decision making process ethically complex. First of all, a theoretical framework was developed based on the preceding research; then, the study was further conducted utilizing a qualitative research method with an exploratory approach. The data were collected using in-depth interviews and analysed using the theme analysis method. The corresponding interviewees... 

    Multiple Case Study of Distributed Leadership Effectiveness in Educational Major FoundingTeams of Sharif University of Technology

    , M.Sc. Thesis Sharif University of Technology Samimi, Mehdi (Author) ; Alavi, Babak (Supervisor)
    Abstract
    Using Distributed leadership framework while studying the leadership phenomena in teams, especially in educational environment, has received more attention by scholars in these years. Although the results of these researches indicated positive consequences mostly, the need for exploratory studies to identify situational and contextual factors in distributed leadership effectiveness has been mentioned. In other words, it has been suggested that the effectiveness of distributed leadership in teams may be affected by situational and contextual factors. In the current multiple case study, after the initial study of leadership and its functions in some schools of Sharif University of Technology,... 

    Identification of Influence Mechanisms of Executive/non-executive Board Composition on Board’s Attribution Style

    , M.Sc. Thesis Sharif University of Technology Helaly, Hamed (Author) ; Alavi, Babak (Supervisor)
    Abstract
    The influence mechanisms of executive/non-executive board compostion on board’s attribution style have been explored. In two case studies, I have examined boards’ causal interpretation about a critical incident which had a significant impact on firm performance. A qualitative research approach has been taken in the case studies. Data was gathered through semi-structured interviews with all board members and was analyzied with the theme analysis method. According to the results, board of directors’ collective attribution formation process can be devided into three stages of members’ expression of information and facts at board meetings, forming the individual judgements of members and at... 

    A Study on Relationships between Career Anchors and Career Orientations

    , M.Sc. Thesis Sharif University of Technology Shahrzad, Zarvan (Author) ; Alavi, Babak (Supervisor)
    Abstract
    Career Orientations or career choices, can be affected by internal and external factors. External factors are the environmental conditions that the reward and the attractiveness of selecting a career choice are dependent to them. Internal factors include the needs of oneself from his/her job, his/her beliefs and his/her skills and competencies about the job. In this research the internal antecedents of managerial and technical orientations between programmers have been identified. On the other hand the perception of people about the compensation system as an external factor which can affect the mentioned relationships, have been analyzed. It seems that this is the first research which career...