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    Forced convective heat transfer in parallel flow multilayer microchannels

    , Article Journal of Heat Transfer ; Volume 129, Issue 9 , 2007 , Pages 1230-1236 ; 00221481 (ISSN) Saidi, M. H ; Hajiaghaee Khiabani , R ; Sharif University of Technology
    2007
    Abstract
    In this paper, the effect of increasing the number of layers on improving the thermal performance of microchannel heat sinks is studied. In this way, both numerical and analytical methods are utilized. The analytical method is based on the porous medium assumption. Here, the modified Darcy equation and the energy balance equations are used. The method has led to an analytical expression presenting the average dimensionless temperature field in the multilayer microchannel heat sink. The effects of different parameters such as aspect ratio, porosity, channel width, and the solid properties on the thermal resistance are described. The results for single layer and multilayer heat sinks are... 

    Does the short-term boost of renewable energies guarantee their stable long-term growth? Assessment of the dynamics of feed-in tariff policy

    , Article Renewable Energy ; Volume 159 , October , 2020 , Pages 1252-1268 Milad Mousavian, H ; Hamed Shakouri, G ; Mashayekhi, A. N ; Kazemi, A ; Sharif University of Technology
    Elsevier Ltd  2020
    Abstract
    Feed-in tariff (FiT) is one of the most efficient ways that many governments throughout the world use to stimulate investment in renewable energies (REs) technology. For governments, financial management of the policy could be challenging as it needs a considerable amount of budget to support RE producers during the long remuneration period. In this paper, it has been illuminated that the early growth of REs capacity could be a temporary boost. And the socio-economic structure of the system will backlash the policy if some social mechanisms are not considered. Social tolerance for paying REs tax and potential investors’ trust emanated from budget-related mechanisms -which have rarely been... 

    A goal programming approach for optimal PMU placement

    , Article International Review on Modelling and Simulations ; Volume 6, Issue 2 , April , 2013 , Pages 490-497 ; 19749821 (ISSN) Khiabani, V ; Hamidi, M ; Farahmand, K ; Aghatehrani, R ; Sharif University of Technology
    2013
    Abstract
    This article proposes a multi-objective goal programming based approach with two objectives of maximizing the reliability and minimizing the placement cost of Phasor Measurement Units (PMUs) for full observability in power systems. The weighted sum goal programming formulation incorporates the reliability of individual PMUs and finds a placement to resolve the conflicting objectives of minimum number of PMUs cost-wise and maximum level of system-wide reliability. This multi-objective problem is formulated as a nonlinear goal programming model in which weights are associated with the objectives. The model is solved for several weight scenarios for the IEEE 14, 30, 57 and 118 bus test systems.... 

    Analysis of micro channel heat sink performance

    , Article 2005 SEM Annual Conference and Exposition on Experimental and Applied Mechanics, Portland, OR, 7 June 2005 through 9 June 2005 ; 2005 , Pages 1911-1918 ; 0912053909 (ISBN) Saidi, M. H ; Salehi, M ; Khiabani, R. H ; Sharif University of Technology
    2005
    Abstract
    In the present research a numerical investigation has been made to evaluate the results of analytical approach in the analysis of micro channel heat sink (MCHS) which is increasingly used in the cooling of high heat dissipating electronic devices. In this regard the effects of geometrical and flow parameters affecting the absolute thermal resistance of MCHS have been analyzed. The effect of using different fluids in the value of the thermal resistance is considered as well. The accuracy of analytical method in predicting heat transfer and fluid flow regimes in micro channel is checked in comparison with numerical method. The effects of hydraulic and thermal entrance lengths of these systems... 

    Development of a Covering Location Model in Congested Networks

    , M.Sc. Thesis Sharif University of Technology Golchin Khiabani Azar, Negar (Author) ; Shavandi, Hassan (Supervisor)
    Abstract
    Plants, distribution centers, and other facilities generally function for years or decades, during which time the environment in which they operate may change substantially. Costs, demands, travel times, and other inputs to classical facility location models may be highly uncertain. So when making decisions of location considering the factors that may change is beneficial. In this thesis a version of covering location model under uncertainty in a congested system is proposed. The aim is to locate m facilities to maximize the captured customer utility, having in mind that there may be up to q facilities established in future; the only information at hand about the number of the new facilities... 

    Application of Data Mining in Prediction of Diabetes type 2

    , M.Sc. Thesis Sharif University of Technology Bagherzadeh Khiabani, Farideh (Author) ; Akhavan Niaki, Taghi (Supervisor)
    Abstract
    Developments in the field of data storage which is due to computers have led to an extraordinary increase in medical data just like the increase in all other fields. As a result, physicians are faced with the problem of using the stored data. Therefore, the traditional manual data analysis is inadequate due to the large amounts of data. Furthermore, the ability to use this data to extract useful information is critical for the quality of medical care. Therefore, data mining techniques arose so that we will be able to extract knowledge through applying them to the raw data and subsequently help the doctors in making decisions.
    In this study, we are pursuing four goals. First, in order to... 

    Reviewing and Analyzing the Political Marketing Program of Candidates for Parliamentary Elections on Social Networks (Twitter and Instagram) in Parliamentary Elections

    , M.Sc. Thesis Sharif University of Technology Khiabani, Milad (Author) ; Karami, Naser (Supervisor) ; Honarvar, Ruhollah (Supervisor)
    Abstract
    With the emergence and expansion of social media in the societies, these media has become an integral part of modern society and the lives of citizens. These networks have improved communication facilities in the community and created an opportunity for politicians to use these media as a communication and marketing channel to communicate with citizens and use them to achieve their goals. Social media's ability to communicate has put politicians' relationship with citizens in a very strategic position. This has made it important to have a communication plan and, more generally, principled political marketing.Therefore, the main issue that this dissertation has investigated is the review of... 

    Maneuverability improvement for an ultra eight airplane model using variable shape wing

    , Article Collection of Technical Papers - AIAA Atmospheric Flight Mechanics Conference, Providence, RI, 16 August 2004 through 19 August 2004 ; Volume 1 , 2004 , Pages 467-476 ; 1563477009 (ISBN) Alasty, A ; Alemohammad, S. H ; Khiabani, R. H ; Khalighi, Y ; Sharif University of Technology
    2004
    Abstract
    One of the significant methods to design airplanes with high capabilities is taking advantage of variable shape structures to improve flight efficiency. In present article the effect of a variable shape wing on an ultra light flyer has been considered. Very low weight of this kind of airplane limits the applicability of control surfaces to attain appropriate maneuvers. To overcome this problem, implementation of a variable shape structure using SMA actuators has been proposed. For simulation, deformed shape of wings has been calculated with finite element method; this data has been used to determine aerodynamic coefficients using computational fluid dynamic (CFD) and finally leads to flight... 

    Modeling and analysis of AN ultra light slow flyer with variable shape control surfaces using shape memory alloy actuators

    , Article Proceedings of the 7th Biennial Conference on Engineering Systems Design and Analysis - 2004, Manchester, 19 July 2004 through 22 July 2004 ; Volume 2 , 2004 , Pages 153-162 ; 0791841731 (ISBN); 9780791841730 (ISBN) Alasty, A ; Alemohamad, S. H ; Khiabani, R. H ; Khalighi, Y ; Sharif University of Technology
    American Society of Mechanical Engineers  2004
    Abstract
    Applying flexible variable shape control surfaces (wing and elevator) structures is a way to increase efficiency and maneuverability of the planes, which is recently under research. In this paper, modeling of the flight of an unmanned ultra light plane is discussed. The modeling is done based on a real ultra light plane presented recently. To increase maneuverability of the plane, flexible variable shape structures are designed for the wing and the elevator. In design procedure, having an ultra light plane is considered. The elevator and the wing are used as control surfaces for longitudinal and lateral maneuvers respectively. Shape memory alloys (SMA) are used for reshaping the flexible... 

    Design, dynamic analysis and optimization of a Rover for rescue operations

    , Article Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) ; Volume 4020 LNAI , 2006 , Pages 290-300 ; 03029743 (ISSN); 9783540354376 (ISBN) Tavakoli Nia, H ; Alemohammad, S. H ; Bagheri, S ; Khiabani', R. H ; Meghdari, A ; Sharif University of Technology
    Springer Verlag  2006
    Abstract
    In this paper a new approach to dynamic optimization of a rough terrain rover is introduced. Since rover wheels traction has a significant role in rover mobility, optimization is based on the minimization of traction at rover wheel-ground interfaces. The method of optimization chosen is Genetic Algorithm (GA) which is a directed random search technique along with the usual optimization based on directional derivatives. GA is a suitable and efficient method of optimization for nonlinear problems. The procedure is applied on a specific rough terrain rover called CEDRA-I Shrimp Rover. The present work resulted in design and manufacturing of the optimized rover called CEDRA-II Shrimp Rover. ©... 

    Rough terrain rovers dynamics analysis and optimization

    , Article DETC2005: ASME International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, Long Beach, CA, 24 September 2005 through 28 September 2005 ; Volume 7 B , 2005 , Pages 903-909 ; 0791847446 (ISBN) Tavakoli Nia, H ; Alemohammad, S. H ; Bagheri, S ; Khiabani, R. H ; Meghdari, A ; Sharif University of Technology
    2005
    Abstract
    In this paper a new approach to dynamics optimization of rough terrain rovers is introduced. Since rover wheels traction has a significant role in rover mobility, optimization is based on the minimization of traction at rover wheel-ground interfaces. The method of optimization chosen is Genetic Algorithm (GA) which is a directed random search technique along with the usual optimization based on directional derivatives. GA is a suitable and efficient method of optimization for nonlinear problems. The procedure is applied on a specific rough terrain rover called CEDRA-I Shrimp Rover. Dynamical equations are obtained using Kane's method. Finally, the results are verified by modeling of the... 

    Calcium chloride adsorption at liquid-liquid interfaces: A molecular dynamics simulation study

    , Article Colloids and Surfaces A: Physicochemical and Engineering Aspects ; Volume 527 , 2017 , Pages 70-80 ; 09277757 (ISSN) Khiabani, N. P ; Bahramian, A ; Chen, P ; Pourafshary, P ; Goddard, W.A., III ; Ejtehadi, M. R ; Sharif University of Technology
    2017
    Abstract
    We carried out molecular dynamics simulations (MD) to investigate the adsorption of calcium chloride (CaCl2) at n-hexane-water interfaces. We also measured the interfacial tensions (IFT) of the selected systems making use of the pendant-drop method. The histograms of hexane, water, and the ions indicate an electrical double layer (EDL) near the interface. The trend of the EDL indicates that chloride anions intend to adsorb to the interface more intrinsically than calcium cations. The measured interfacial width of the n-hexane-water interfaces decreases with the salt concentration. The average densities of the interfacial and bulk aqueous solutions demonstrate density heterogeneity in the... 

    Investigation of salts behavior at liquid–liquid interfaces

    , Article Springer Proceedings in Mathematics and Statistics, 26 August 2013 through 30 August 2013 ; Volume 117 , July , 2015 , Pages 265-270 ; 21941009 (ISSN) ; 9783319123066 (ISBN); 9783319123066 (ISBN) Khiabani, N. P ; Bahramian, A ; Soltani, M ; Pourafshary, P ; Sarikhani, K ; Chen, P ; Ejtehadi, M. R ; Makarov R. N ; Melnik R. V. N ; Kotsireas I. S ; Shodiev H ; Cojocaru M. G ; Cojocaru M. G ; Makarov R. N ; Melnik R. V. N ; Kotsireas I. S ; Shodiev H ; Sharif University of Technology
    Springer New York LLC  2015
    Abstract
    We have used molecular dynamics simulation to investigate hydrophilic– hydrophobic interfaces between calcium chloride (CaCl2) aqueous solutions and normal hexane. The results demonstrate the increasing impact of salt concentration on the liquid–liquid interfacial tension, hence, negative adsorption of CaCl2 according to Gibbs adsorption isotherm. Moreover, we calculated the density profiles of hexane, water, and the counter ions. The results reveal an electrical double layer near the interface and the less affinity of calcium cations toward the interface than that of chloride anions. Orientation of water molecules at the studied concentrations may result in developing a positively charged...