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    Development of international market information in emerging economy family SMEs: The role of participative governance

    , Article Journal of Small Business Management ; 2020 Zaefarian, R ; Tasavori, M ; Eng, T. Y ; Demirbag, M ; Sharif University of Technology
    Taylor and Francis Ltd  2020
    Emerging economy family SMEs pursuing internationalization have to develop international market information acquisition capability. However, there is limited knowledge about how to develop and utilize this capability. We investigate the role of participative governance and the extent to which participation of board and family members enhances this capability. We also examine the mediating role of this capability in the relationship of participative governance and international firm performance. Our analysis of 192 Turkish firms corroborates the role of participative governance. However, we find that this capability plays a partial mediating role only when family firms measure their... 

    Experimental study of internal forced convection of ferrofluid flow in porous media

    , Article Defect and Diffusion Forum ; Vol. 348 , April , 2014 , pp. 139-146 ; ISSN: 10120386 ; ISBN: 9783038350002 Sehat, A ; Sadrhosseini, H ; Shafii, M. B ; Sharif University of Technology
    This work presents an experimental study of the effect of a magnetic field on laminar forced convection of a ferrofluid flowing in a tube filled with permeable material. The walls of the tube are subjected to a uniform heat flux and the permeable bed consists of uniform spheres of 3-mm diameter. The ferrofluid synthesis is based on reacting iron (II) and iron (III) in an aqueous ammonia solution to form magnetite, Fe3O4. The magnetite is mixed with aqueous tetra methyl ammonium hydroxide, (CH3) 4NOH, solution. The dependency of the pressure drop on the volume fraction, and comparison of the pressure drop and the temperature distribution of the tube wall is studied. Also comparison of the... 

    Preparation and evaluation of a [66ga]gallium chitosan complex in fibrosarcoma bearing animal models

    , Article Nukleonika ; Volume 56, Issue 1 , 2011 , Pages 35-40 ; 00295922 (ISSN) Pourjavadi, A ; Akhlaghi, M ; Jalilian, A. R ; Sharif University of Technology
    [66Ga]gallium chitosan complex was prepared with a high radiochemical purity (> 99%) in dilute acetic acid solution. The radiochemical purity of [66Ga]gallium chitosan complex was checked by using paper chromatography technique. The prepared complex solution was injected intratumoral to fibrosarcoma-bearing mice and the leakage of radioactivity from injection site was investigated. Approximately, 85.4% of the injected dose was retained in the injection site 54 h after injection and most of the leaked radioactivity was accumulated in the blood, liver (0.5%) and lung (6.5%)  

    A simple method for derivation of the rovibrational hamiltonian: Application to orthogonal radau coordinate systems as special cases

    , Article Journal of the Iranian Chemical Society ; Volume 7, Issue 1 , 2010 , Pages 77-83 ; 1735207X (ISSN) Ebrahimi, H. P ; Tafazzoli, M ; Islampour, R ; Sharif University of Technology
    The molecular Hamiltonian of polyatomic molecules has been obtained. A general choice of internal coordinates depending on external parameters was considered. The rovibrational Hamiltonian for this set of coordinate system was derived in general terms as a function of the external parameters a and b. This procedure is also applicable to various kinds of internal coordinates in a straightforward way. The rovibrational Hamiltonian of triatomic molecules is considered as an application of this general formulation. In addition, orthogonal Radau coordinates are considered as cases of this new approach  

    Flow visualization of internal waves and wakes of a streamlined body in a stratified fluid

    , Article Journal of Applied Fluid Mechanics ; Volume 9, Issue 2 , 2016 , Pages 635-641 ; 17353572 (ISSN) Bidokhti, A. A ; Bidokhti, A. A ; Sharif University of Technology
    Isfahan University of Technology  2016
    The wake and internal waves of a moving three dimensional (3D) airfoil body in a stratified fluid has been investigated in a large stratified tank with a finite depth using movies of shadowgraphs of the flow fields. Typical Reynolds and Froude numbers of the flow varied between 103 and 104, and 0.3 and 2 respectively. The flows are generated often by towing the body in a uniformly stratified flow, while limited cases are carried out with body stationary and the channel was in recirculating mode. For some experiments the density profile had a stepped like shape. The wake flow is often consisted of internal waves including random and coherent ones. Distortion of density fields was also... 

    Preparation of mesh-reinforced cellulose acetate forward osmosis membrane with very low surface roughness

    , Article Korean Journal of Chemical Engineering ; Volume 34, Issue 12 , 2017 , Pages 3170-3177 ; 02561115 (ISSN) Mirkhalili, S. M ; Mousavi, S. A ; Ramazani Saadat Abadi, A ; Sadeghi, M ; Sharif University of Technology
    Mesh-reinforced cellulose acetate (CA)-based membranes were prepared for forward osmosis (FO) by immersion precipitation. Casting compositions such as CA percent and 1, 4-dioxane/acetone ratio and also preparation conditions such as evaporation time, coagulation bath and annealing temperatures were tested for membranes’ performance. The results were compared with commercially CTA membranes. The best membrane (17.9% polymer and 1, 4-dioxane/acetone ratio of 1.89) showed water flux of 9.3 L/m2h (LMH) and RSF of 0.536 mol NaCl/m2h. Moreover, the membrane structure was reinforced by a polyester mesh, which created micro pores in the back of the membrane. This caused higher water flux and RSF... 

    Growth through export: evidence from Iran’s manufacturing plants

    , Article Journal of Economic Studies ; Volume 47, Issue 1 , 23 January , 2020 , Pages 111-131 Yousefi, K ; Madnanizdeh, S. A ; Sobhani, F. Z ; Sharif University of Technology
    Emerald Group Publishing Ltd  2020
    Purpose: Does the long-term growth rate of a firm increase by exporting? If yes, how large is that increase in a developing economy? The paper aims to discuss this issue. Design/methodology/approach: The authors incorporate data from the manufacturing plants in Iran as a developing economy for 2003–2011 to address this question. Using fixed effect panel and propensity score matching method, the authors examine whether exportation can affect a firm’s growth rate to test for the learning to grow hypothesis. Findings: The findings document that: not only the exporters are larger and more productive than non-exporters, but they also grow faster in size and productivity measures as well.... 

    Evaluation of spinal internal loads and lumbar curvature under holding static load at different trunk and knee positions

    , Article Pakistan Journal of Biological Sciences ; Volume 10, Issue 7 , 2007 , Pages 1036-1043 ; 10288880 (ISSN) Kahrizi, S ; Parnianpour, M ; Firoozabadi, S. M ; Kasemnejad, A ; Karimi, E ; Sharif University of Technology
    Asian Network for Scientific Information  2007
    A study was performed to investigate how different trunk and knee positions while holding static loads affect the lumbar curvature and internal loads on the lumbar spine at L4-L5. Ten healthy male subjects participated in this study. Two inclinometers were used to evaluate the curvature of lumbar spine, lordosis, while a 3D static biomechanical model was used to predict the spinal compression and shear forces at L4-L 5. Eighteen static tasks while holding three level of load (0, 10 and 20 kg), two levels of knee position (45 and 180° of flexion) and three levels of trunk position (neutral, 15 and 30 degree of flexion) were simulated for 10 healthy male subjects. The results of this study... 

    A novel multi-sender algorithm based on multi-cast concept for P2P networks

    , Article 2006 International Symposium on Communications and Information Technologies, ISCIT, Bangkok, 18 October 2006 through 20 October 2006 ; 2006 , Pages 143-147 Firooz, M. H ; Ronasi, K ; Pakravan, M. R ; Avanaki, A. N ; Sharif University of Technology
    Unlike those on Internet, the media providers on P2P networks are ordinary nodes whose contribution bandwidth is limited. Multi-sender methods are the best solutions known to video streaming on P2P networks. In this paper, we propose use of a multi-cast method on the top of an arbitrary multi-sender method so that all requesting peers receive almost the same expected bit-rate. That is while the existing multi-sender methods maximize the bit-rate delivered to the first receiver and cannot provide acceptable bit-rates to the next requesting nodes. © 2006 IEEE  

    Idiosyncratic return volatility and the role of firm fundamentals: A cross-country analysis

    , Article Global Finance Journal ; Volume 50 , 2021 ; 10440283 (ISSN) Ebrahim Nejad, A ; Hoseinzade, S ; Sharif University of Technology
    Elsevier B.V  2021
    We investigate the relation between fundamental idiosyncratic volatility and stock returns idiosyncratic volatility using data from 56 countries. We find a strong positive relation between fundamental idiosyncratic volatility and idiosyncratic volatility of returns. This association, however, seems to be entirely concentrated in the developed economies, and we find no effect in the emerging markets. Specifically, fundamental idiosyncratic volatility does not lead to more idiosyncratic return volatility in countries with poor legal institutions and weak shareholder protection laws. © 2021 Elsevier Inc  

    Growth and damping of interfacial waves on a diffuse interface

    , Article Environmental Fluid Mechanics ; Volume 16, Issue 2 , 2016 , Pages 401-412 ; 15677419 (ISSN) Fazeli, M ; Jamali, M ; Lawrence, G. A ; Seymour, B ; Sharif University of Technology
    The resonant interaction of surface and internal waves produces a nonlinear mechanism for energy transfer among wave components in oceans, lakes, and estuaries. In many field situations, the stratification may be well approximated by a two-layer fluid with a diffuse interface. The growth and damping rates of sub-harmonic interfacial waves generated by a surface wave through a three-wave resonant interaction are measured in the laboratory. These measurements are compared with theoretical predictions. A diffuse interface reduces the damping rate and increases the growth rate. The predicted growth rate provides excellent comparison with the laboratory measurements. The inclusion of the effects... 

    H.R.M Internal Auditing Assessment in Bank of Industry and Mine

    , M.Sc. Thesis Sharif University of Technology Khani Porshokouh, Vida (Author) ; Sharbatoghli, Ahmad (Supervisor)
    A dynamic organization, move correctly in right direction with designing internal control in order to achieve its goals, access its missions and minimize its risks. The controls help manager to accommodate with the fast and unstable economic and competitive environment evolutions.The most important reason for applying internal auditing is the legal consequence which might confront with. For example according to the government rules, the personnel must get insurance by the organization. If the organization refuses handling this, it will face with serious penalties. By internal auditing and correction proceedings, managers could prevent from problems before be threaten from out of the... 

    Theoretical and Experimental Investigation of The Wankel Engine Turbochargering

    , M.Sc. Thesis Sharif University of Technology Moslemzadeh, Mohsen (Author) ; Hajilouy Benisi, Ali (Supervisor) ; Mozafari, Ali Asghar (Supervisor)
    The Rotary Combustion Engines are known as Wankel Engines, for the first time designed and built by German inventor, Felix Wankel. In open letrecher, research reports about these engines are much less than piston engines. While, the wankel engine hase many advantages such as lower volume, less weight, less vibration and use of fuels lower octane number in compared with reciprocating engines. Therefore, it has particular importance in industries such as aircraft manufactueres.In this theses after the introduction chapter, Wankel engines and Turbochargers usage are reviewed. Then the Wankel engine and its turbocharging are searched in letrecher. Then, a computer code for simulation the Wankel... 

    Conceptual Evaluation of Brain Internal Models and Modeling their Uncertainty

    , M.Sc. Thesis Sharif University of Technology Sirjani, Nasim (Author) ; Jahed, Mehran (Supervisor)
    In the literature of motor behavior, rapid and harmonious human movements and adaptation to limb dynamics are described with reference to internal models. Concepts of internal models in neuroscience cognitive sciences and computational modeling have been investigated and their structure and performance have been evaluated by behavioral, neurophysiological and medical imaging data. The purpose of the theory of internal models is to explain the mechanism of human movement. Based on this theory, the central nervous system uses internal models to predict and adjust movements and reduce uncertainty. Uncertainty refers to the unknown dynamics of the system due to the lack of access to accurate... 

    An analytical and experimental study of a hybrid rocket motor

    , Article Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering ; Vol. 228, Issue. 13 , December , 2014 , pp. 2475-2486 ; ISSN: 09544100 Rezaei, H ; Soltani, M. R ; Sharif University of Technology
    The hybrid rocket motor is a kind of chemical propulsion system that has been recently given serious attention by various industries and research centers. The relative simplicity, safety and low cost of this motor, in comparison with other chemical propulsion motors, are the most important reasons for such interest. Moreover, throttle-ability and thrust variability on demand are additional advantages of this type of motor. In this paper, the result of an internal ballistic simulation of hybrid rocket motor in a zero-dimensional form is presented. Further to validate the code, an experimental setup was designed and manufactured. The simulation results are compared with the experimental data... 

    On the period of GSM's A5/1 stream cipher and its internal state transition structure

    , Article 2011 8th International ISC Conference on Information Security and Cryptology, ISCISC 2011, 14 September 2011 through 15 September 2011, Mashhad ; 2011 , Pages 37-40 ; 9781467300773 (ISBN) Amin Ghaffari, V ; Vardasbi, A ; Sharif University of Technology
    The A5/1 algorithm is one of the most applicable and famous stream cipher algorithms. However, the period of A5/1 keystream sequence and the exact structure of its internal state transition were not investigated thoroughly, until now. This paper deals with the transition of the internal state of A5/1 algorithm and tries to present a model for such a transition. Additionally, the internal states are divided into two groups, initially periodic and ultimately periodic. The presented model is verified using a variety of simulations and it is consistent with theoretical results as well  

    Symmetry and partial order reduction techniques in model checking Rebeca

    , Article Acta Informatica ; Volume 47, Issue 1 , 2010 , Pages 33-66 ; 00015903 (ISSN) Jaghoori, M.M ; Sirjani, M ; Mousavi, M.R ; Khamespanah, E ; Movaghar, A ; Sharif University of Technology
    Rebeca is an actor-based language with formal semantics which is suitable for modeling concurrent and distributed systems and protocols. Due to its object model, partial order and symmetry detection and reduction techniques can be efficiently applied to dynamic Rebeca models. We present two approaches for detecting symmetry in Rebeca models: One that detects symmetry in the topology of inter-connections among objects and another one which exploits specific data structures to reflect internal symmetry in the internal structure of an object. The former approach is novel in that it does not require any input from the modeler and can deal with the dynamic changes of topology. This approach is... 

    The autonomy of science as a civilian casualty of economic warfare: inadvertent censorship of science resulting from unilateral economic sanctions

    , Article Science and Engineering Ethics ; Volume 27, Issue 4 , 2021 ; 13533452 (ISSN) Esmaeili, H ; Ataie Ashtiani, B ; Sharif University of Technology
    Springer Science and Business Media B.V  2021
    Unilateral coercive international political, diplomatic, and economic sanctions are regular events of international relations and international law within the landscape of foreign affairs. However, while they may be prescribed by international law, or national legal systems, for peace and security reasons they have also been imposed for political grounds by powerful States such as the United States. The US sanctions are now targeting science, academic and university domains. When applied in this way, these sanctions violate international law, principles of human rights, ethics, the autonomy of scientific institutions, and the norm of universalism in science. All of which protect and promote... 

    Using Suitable Softwares for Micrositing Calculations in Order to Generate Wind Energy for a Specific Region

    , M.Sc. Thesis Sharif University of Technology Saraei, Alireza (Author) ; Abbaspour, Majid (Supervisor) ; Mozaffari, Ali Asghar (Supervisor)
    Because of advantages of using new sources of energy in the country, especially for generating green energy, the use of wind energy for power generating in wind Fields is of great interest of current communities. For developing a wind power plant the first step is to locate and confirm the areas which possess enough potential for installing the wind turbines. For this purpose in the first chapter of this thesis an introduction to the basic principles of wind energy is noted then in the next chapter the physical relations to calculate the estimated reachable energy in the area is mentioned and in the third chapter the empirical methods for selection of the suitable sites are exhibited .in the... 

    Synthesis and Application of Superabsorbent Nanocomposites for Optimized Performance in Cement-based Materials

    , Ph.D. Dissertation Sharif University of Technology Fakourpour, Mahmoud (Author) ; Pourjavadi, Ali (Supervisor)
    Superabsorbent polymers are mainly used in baby diapers and in agriculture. A less known emerging and potentially important application is the internal curing of cement based materials. About a decade ago, pioneering works demonstrated that using SAP in concrete reduces autogenous shrinkage and cracking, and improves hydration of the cement matrix. However, problems like workability reduction, and deterioration of mechanical strength of the mixture are reported. In this thesis, nanocomposites using nanosilica and acrylic monomers were prepared and used to address the above problems. Nanocomposites exhibit enhanced mechanical strength and reduced sliding friction, compared with conventional...