Search for: new-mechanisms
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    Towards an efficient method for spreading information in social network

    , Article 2009 3rd Asia International Conference on Modelling and Simulation, AMS 2009, Bandung, Bali, 25 May 2009 through 26 May 2009 ; 2009 , Pages 152-157 ; 9780769536484 (ISBN) Ahmadi, H ; Mehrbakhsh, A ; Asgarian, E ; Sharif University of Technology
    Nowadays, content distribution is of high attention in peer to peer information systems. There are two main problems that could be mentioned in this context. The first problem is how to disseminate fragments of information efficiently and the next is to avoid missing same rare fragments towards end of download. For overcoming these problems, a new mechanism is presented in this paper which uses gossip algorithms on basis of social networks. Our mechanism maintains simplicity of gossip and has low overhead. This mechanism includes two phases for managing traffic and solving bottleneck problem: one for spreading rumors inside the social network and finding network of interests and the other... 

    Asphaltene deposition in carbonate rocks: Experimental investigation and numerical simulation

    , Article Energy and Fuels ; Volume 26, Issue 10 , June , 2012 , Pages 6186-6199 ; 08870624 (ISSN) Kord, S ; Miri, R ; Ayatollahi, S ; Escrochi, M ; Sharif University of Technology
    Oil production from asphaltenic oil reservoirs has always encountered difficulties, such as plugging and unpredictable fluid properties. To physically recognize the aspects of asphaltene deposition, several dynamic and static asphaltene deposition tests were designed and performed on one of the giant south Iranian oil reservoirs using dead and live crude oil and real core samples. Moreover, the effects of fluid velocity on the extent of damage were investigated. It was found that surface deposition of asphaltene particles is the main source of formation damages in the porous media and the resulting permeability impairment obeys an exponential behavior. All of the experiments confirm that... 

    Modeling the microstructural evolution and effect of cooling rate on the nanograins formed during the friction stir processing of Al5083

    , Article Materials Science and Engineering A ; Volume 527, Issue 1-2 , 2009 , Pages 192-197 ; 09215093 (ISSN) Yazdipour, A ; Shafiei M., A ; Dehghani, K ; Sharif University of Technology
    An analytical model is developed to study the effect of cooling rate on the final grain size of stirred zone of the Al5083 subjected to friction stir processing. The effect of cooling rate on the grain size of the stirred zone was investigated experimentally and numerically. A new microstructural evolution model was also suggested illustrating the mechanisms contributed in refining the microstructure. A new mechanism termed meta-dynamic recovery (MDRV) is introduced here in this regard. The simulation results also show that the rapid cooling rate resulted in superior mechanical properties through refining the microstructure of the stirred zone. However, decreasing the rotational speed and... 

    Motion analysis of a vibrational micro-robot with two perpendicular harmonic actuators and deriving the design parameters in stick-slip-jump mode

    , Article Journal of Sound and Vibration ; Volume 372 , 2016 , Pages 266-282 ; 0022460X (ISSN) Jalili, H ; Vossoughi, G ; Salarieh, H ; Sharif University of Technology
    Academic Press  2016
    In this paper, the motion of a micro-robot with two perpendicular vibrational actuators is studied. In this work, separation of the micro-robot body from the substrate of motion takes place. The separation happens while the vertical force applied to the micro-robot body is greater than the micro-robot weight. In this condition, body of the micro-robot jumps apart from the substrate and then returns to it, and this motion will continue intermittently until it becomes damped. In this condition, the motion mechanism of "stick-slip" is not valid and we introduce a new mechanism of hybrid motion as "stick-slip-jump". In this case (hybrid motion), the micro-robot dynamics is modeled and the result... 

    On the kinematic analysis of a spatial six-degree-of-freedom parallel manipulator

    , Article Scientia Iranica ; Volume 16, Issue 1 , 2009 , Pages 1-14 ; 10263098 (ISSN) Vakil, M ; Pendar, H ; Zohoor, H ; Sharif University of Technology
    In this paper, a novel spatial six-degree-of freedom parallel manipulator actuated by three base-mounted partial spherical actuators is studied. This new parallel manipulator consists of a base platform and a moving platform, which are connected by three legs. Each leg of the manipulator is composed of a spherical joint, prismatic joint and universal joint. The base-mounted partial spherical actuators can only specify the direction of their corresponding legs. In other words, the spin of each leg is a passive degree-of-freedom. The inverse pose and forward pose of the new mechanism are described. In the inverse pose kinematics, active joint variables are calculated with no need for...