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    BRST quantization of noncommutative gauge theories

    , Article Physical Review D - Particles, Fields, Gravitation and Cosmology ; Volume 67, Issue 10 , 2003 ; 15507998 (ISSN) Soroush, M ; Sharif University of Technology
    2003
    Abstract
    In this paper, the Becchi-Rouet-Stora-Tyutin (BRST) symmetry transformation is presented for the noncommutative [Formula Presented] gauge theory. The nilpotency of the charge associated with this symmetry is then proved. As a consequence of the spacelike noncommutativity parameter, the Hilbert space of physical states is determined by the cohomology space of the BRST operator as in the commutative case. Further, the unitarity of the S-matrix elements projected onto the subspace of the physical states is deduced. © 2003 The American Physical Society  

    Physical properties of the WASP-67 planetary system from multi-colour photometry

    , Article Astronomy and Astrophysics ; Vol. 568 , August , 2014 ; ISSN: 00046361 Mancini, L ; Southworth, J ; Ciceri, S ; Calchi Novati, S ; Dominik, M ; Henning, Th ; Jorgensen, U. G ; Korhonen, H ; Nikolov, N ; Alsubai, K. A ; Bozza, V ; Bramich, D. M ; D'Ago, G ; Figuera Jaimes, R ; Galianni, P ; Gu, S. H ; Harpsoe, K ; Hinse, T. C ; Hundertmark, M ; Juncher, D ; Kains, N ; Popovas, A ; Rabus, M ; Rahvar, S ; Skottfelt, J ; Snodgrass, C ; Street, R ; Surdej, J ; Tsapras, Y ; Vilela, C ; Wang, X. B ; Wertz, O ; Sharif University of Technology
    Abstract
    Context. The extrasolar planet WASP-67 b is the first hot Jupiter definitively known to undergo only partial eclipses. The lack of the second and third contact points in this planetary system makes it difficult to obtain accurate measurements of its physical parameters  

    Design for Fabrication and Physical Parameter Optimization of Mems Parametric Exitation Gyrsocope

    , M.Sc. Thesis Sharif University of Technology Gholamzadeh, Reza (Author) ; Salarie, Hassan (Supervisor)
    Abstract
    Recently, parametric excitation has been proposed and experimentally proven to provide micro gyroscopes with robustness to parameter variations and enhancement of sensitivity. harmonic excitation gyroscopes are very sensitive to response of a resonance at the resonant frequency; therefore it has to be created accurately. However, parametric excitation gyroscopes are not sensitive as a result of wide bound of frequency at drive mode, accordingly it is not necessary to be formed accurately in the same way as harmonic excitation gyroscope.
    The produced stress at combs have a significance effect on robustness, sensitivity and calibration curves of parametric excitation gyroscope, as a... 

    Evaluating the effects of Sasobit on characterization and workability of asphalt mixes containing reclaimed asphalt binders

    , Article Asphalt Pavements - Proceedings of the International Conference on Asphalt Pavements, ISAP 2014 ; Vol. 2, issue , 2014 , p. 1241-1252 Safazadeh, F ; Vahabi, A ; Sharif University of Technology
    Abstract
    Use of Reclaimed Asphalt Pavement in HMA1 is beneficial by reduction of initial costs. But the higher stiffness of aged binder may lead to workability issues in the field, therefore use of large percentages of RAP2 impacts the HMA properties. Utilizing Sasobit is a solution to use more RAP at a relatively lower temperature in HMA mixes. This study investigates the effects of 2 percent Sasobit on the reduction of compaction temperature by measuring low shear viscosity and workability of mixtures containing RAP binder. Low and intermediate temperature properties of RAP binder using mix designs were compared to properties of artificially aged binders. Virgin binder was aged in PAV to make... 

    A novel approach for compensating the significance of tubule's architecture in urine concentrating mechanism of renal medulla

    , Article ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE) ; Volume 3 B , 2013 ; 9780791856222 (ISBN) Sohrabi, S ; Mehr, S. M. N ; Falsafi, P ; ASME ; Sharif University of Technology
    American Society of Mechanical Engineers (ASME)  2013
    Abstract
    Many theories and mathematical simulations have been proposed concerning urine concentrating mechanism (UCM). The WKM and region approach are the two most valuable methods for compensating the effect of tubule's architecture in renal medulla. They both have tried to simulate tubule's confinement within a particular region mathematically in one spatial dimension. In this study, continuity, momentum and species transport equations along with standard expressions for transtubular solutes and water transports on tubule's membrane were solved numerically in three spatial dimensions which practically is the main significance of our novel approach. Model structure has been chosen as simple as... 

    Effect of geometrical parameters on radiometric force in low-pressure MEMS gas actuator

    , Article Microsystem Technologies ; Volume 24, Issue 5 , 2018 , Pages 2189-2198 ; 09467076 (ISSN) Barzegar Gerdroodbary, M ; Domiri Ganji, D ; Taeibi Rahni, M ; Vakilipour, S ; Sharif University of Technology
    Springer Verlag  2018
    Abstract
    In this paper, comprehensive numerical studies are performed to investigate the effects of the geometrical factors on the performance of the low-pressure gas actuator. The flow feature and force generation mechanism inside a rectangular enclosure with heat and cold arms as the non-isothermal walls are inclusively discussed. Also, comprehensive parametric studies are done to reveal the effects of physical parameters on the performance and characteristics of this device in different operating conditions. In this study, the Knudsen number is varied from 0.1 to 4.5 to investigate all characteristics of the thermal-driven force inside the MEMS sensor. In order to simulate a rarefied gas inside... 

    Best vortex tube cascade for highest thermal separation

    , Article International Journal of Refrigeration ; Volume 85 , 2018 , Pages 282-291 ; 01407007 (ISSN) Majidi, D ; Alighardashi, H ; Farhadi, F ; Sharif University of Technology
    Elsevier Ltd  2018
    Abstract
    The current study examines different arrangements of vortex tubes (VTs) to get higher performances for cooling and heating. The effects of thermo-physical parameters such as inlet feed temperature and inlet/outlet vortex tube pressure on generated temperature gradient are investigated. To estimate the cold outlet temperatures, the available equations in the literature are verified against our experimental data. Moreover, we propose a new equation to estimate the hot outlet temperature based on the upper limit of hot temperature (ULHT) and the lower limit of cold temperature (LLCT), verified with experimental data as well. Further, several arrangements are simulated to obtain the minimum cold... 

    Design and synthesis of AKAM: A RISC asynchronous microprocessor

    , Article 2007 International Conference on Intelligent and Advanced Systems, ICIAS 2007, Kuala Lumpur, 25 November 2007 through 28 November 2007 ; 2007 , Pages 1318-1323 ; 1424413559 (ISBN); 9781424413553 (ISBN) Mirza Aghatabar, M ; Rasooli, A ; Jafarpour, B ; Sharif University of Technology
    2007
    Abstract
    Asynchronous microprocessors are more flexible to adapt to physical parameters, and have lower power consumption than synchronous microprocessors. In this paper we will introduce the design of an asynchronous microprocessor (V8-uRISC) and explore its design process compared to synchronous design. The processor is synthesized by Persia, an automatic tool for synthesizing asynchronous circuits. We have performed full functional test at various levels of design and synthesis. Our results show that an area overhead is expected for the asynchronous design as the cost for lower power and more robustness. ©2007 IEEE  

    Interactions between high power fiber laser and rock in shaley formation during drilling and production operation

    , Article 6th EAGE Saint Petersburg International Conference and Exhibition ; 7-10 April , 2014 , Pages 594-598 ; ISBN: 9781632665393 Bazargan, M ; Koohian, A ; Jalalyfar, H ; Habibpour, M ; Shahvar, M. P ; Madani, A ; Sharif University of Technology
    Abstract
    This paper is presenting the data on interactions between Fiber laser and shale. With this obvious goal that is dependent on improving the efficiency of laser power. The idea of selecting shale sample was because of variety of this rock type in Iranian oil and gas formations. In the experiment, a long pulsed laser beam was arranged to drill and propagate surfaces, in the opposite direction to the earth gravity, and it was used to drill hole from the top to the bottom of cylindrical Shale rock. The heat that been induced from the Fiber laser is absorbed in the direct surfaces in front and cause heat flux generation inside of rock texture. The specific heat transfer inside of shale sample can... 

    Dissipative quantum metrology in manybody systems of identical particles

    , Article New Journal of Physics ; Vol. 16, issue , January , 2014 Benatti, F ; Alipour, S ; Rezakhani, A. T ; Sharif University of Technology
    Abstract
    Estimation of physical parameters is essential in almost any part of science and technology. The enhancement of performance in this task (e.g. beating the standard classical shot-noise limit) using available physical resources is a major goal in metrology. Quantum metrology in closed systems has indicated that entanglement in such systems may be a useful resource. However, whether in open quantum systems such enhancements may still show up is not yet fully understood. Here, we consider a dissipative (open) quantum system of identical particles in which a parameter of the open dynamics itself is to be estimated. We employ a recently developed dissipative quantum metrology framework, and... 

    Search for a light pseudoscalar Higgs boson in the dimuon decay channel in pp collisions at √s=7TeV

    , Article Physical Review Letters ; Volume 109, Issue 12 , 2012 ; 00319007 (ISSN) Chatrchyan, S ; Khachatryan, V ; Sirunyan, A. M ; Tumasyan, A ; Adam, W ; Bergauer, T ; Dragicevic, M ; Ero, J ; Fabjan, C ; Friedl, M ; Frühwirth, R ; Ghete, V. M ; Hammer, J ; Hormann, N ; Hrubec, J ; Jeitler, M ; Kiesenhofer, W ; Knünz, V ; Krammer, M ; Liko, D ; Mikulec, I ; Pernicka, M ; Rahbaran, B ; Rohringer, C ; Rohringer, H ; Schofbeck, R ; Strauss, J ; Taurok, A ; Wagner, P ; Waltenberger, W ; Walzel, G ; Widl, E ; Wulz, C. E ; Mossolov, V ; Shumeiko, N ; Suarez Gonzalez, J ; Bansal, S ; Cornelis, T ; De Wolf, E. A ; Janssen, X ; Luyckx, S ; Maes, T ; Mucibello, L ; Ochesanu, S ; Roland, B ; Rougny, R ; Selvaggi, M ; Staykova, Z ; Van Haevermaet, H ; Van Mechelen, P ; Van Remortel, N ; Van Spilbeeck, A ; Blekman, F ; Blyweert, S ; D'hondt, J ; Gonzalez Suarez, R ; Kalogeropoulos, A ; Maes, M ; Olbrechts, A ; Van Doninck, W ; Van Mulders, P ; Van Onsem, G. P ; Villella, I ; Clerbaux, B ; De Lentdecker, G ; Dero, V ; Gay, A. P. R ; Hreus, T ; Leonard, A ; Marage, P .E ; Reis, T ; Thomas, L ; Van Der Velde, C ; Vanlaer, P ; Wang, J ; Adler, V ; Beernaert, K ; Cimmino, A ; Costantini, S ; Garcia, G ; Grunewald, M ; Klein, B ; Lellouch, J ; Marinov, A ; Mccartin, J ; Ocampo Rios, A. A ; Ryckbosch, D ; Strobbe, N ; Thyssen, F ; Tytgat, M ; Vanelderen, L ; Verwilligen, P ; Walsh, S ; Yazgan, E ; Zaganidis, N ; Basegmez, S ; Bruno, G ; Castello, R ; Caudron, A ; Ceard, L ; Delaere, C ; Du Pree, T ; Favart, D ; Forthomme, L ; Giammanco, A ; Hollar, J ; Lemaitre, V ; Liao, J ; Militaru, O ; Nuttens, C ; Pagano, D ; Perrini, L ; Pin, A ; Piotrzkowski, K ; Schul, N ; Vizan Garcia, J.M ; Beliy, N ; Caebergs, T ; Daubie, E ; Hammad, G.H ; Alves, G.A ; Correa Martins Junior, M ; De Jesus Damiao, D ; Martins, T ; Pol, M.E ; Souza, M.H.G ; Aldá Júnior, W.L ; Carvalho, W ; Custódio, A ; Da Costa, E.M ; De Oliveira Martins, C ; Fonseca De Souza, S ; Matos Figueiredo, D ; Mundim, L ; Nogima, H ; Oguri, V ; Prado Da Silva, W.L ; Santoro, A ; Soares Jorge, L ; Sznajder, A ; Bernardes, C.A ; Dias, F.A ; Fernandez Perez Tomei, T.R ; Gregores, E.M ; Lagana, C ; Marinho, F ; Mercadante, P.G ; Novaes, S.F ; Padula, S.S ; Genchev, V ; Iaydjiev, P ; Piperov, S ; Rodozov, M ; Stoykova, S ; Sultanov, G ; Tcholakov, V ; Trayanov, R ; Vutova, M ; Dimitrov, A ; Hadjiiska, R ; Kozhuharov, V ; Litov, L ; Pavlov, B ; Petkov, P ; Bian, J.G ; Chen, G.M ; Chen, H.S ; Jiang, C.H ; Liang, D ; Liang, S ; Meng, X ; Tao, J ; Wang, J ; Wang, X ; Wang, Z ; Xiao, H ; Xu, M ; Zang, J ; Zhang, Z ; Asawatangtrakuldee, C ; Ban, Y ; Guo, S ; Guo, Y ; Li, W ; Liu, S ; Mao, Y ; Qian, S.J ; Teng, H ; Wang, S ; Zhu, B ; Zou, W ; Avila, C ; Gomez, J.P ; Gomez Moreno, B ; Osorio Oliveros, A.F ; Sanabria, J.C ; Godinovic, N ; Lelas, D ; Plestina, R ; Polic, D ; Puljak, I ; Antunovic, Z ; Kovac, M ; Brigljevic, V ; Duric, S ; Kadija, K ; Luetic, J ; Morovic, S ; Attikis, A ; Galanti, M ; Mavromanolakis, G ; Mousa, J ; Nicolaou, C ; Ptochos, F ; Razis, P.A ; Finger, M ; Finger, M ; Assran, Y ; Elgammal, S ; Ellithi Kamel, A ; Khalil, S ; Mahmoud, M.A ; Radi, A ; Kadastik, M ; Müntel, M ; Raidal, M ; Rebane, L ; Tiko, A ; Azzolini, V ; Eerola, P ; Fedi, G ; Voutilainen, M ; Härkönen, J ; Heikkinen, A ; Karimäki, V ; Kinnunen, R ; Kortelainen, M.J ; Lampén, T ; Lassila-Perini, K ; Lehti, S ; Lindén, T ; Luukka, P ; Mäenpää, T ; Peltola, T ; Tuominen, E ; Tuominiemi, J ; Tuovinen, E ; Ungaro, D ; Wendland, L ; Banzuzi, K ; Karjalainen, A ; Korpela, A ; Tuuva, T ; Besancon, M ; Choudhury, S ; Dejardin, M ; Denegri, D ; Fabbro, B ; Faure, J.L ; Ferri, F ; Ganjour, S ; Givernaud, A ; Gras, P ; Hamel De Monchenault, G ; Jarry, P ; Locci, E ; Malcles, J ; Millischer, L ; Nayak, A ; Rander, J ; Rosowsky, A ; Shreyber, I ; Titov, M ; Baffioni, S ; Beaudette, F ; Benhabib, L ; Bianchini, L ; Bluj, M ; Broutin, C ; Busson, P ; Charlot, C ; Daci, N ; Dahms, T ; Dobrzynski, L ; Granier De Cassagnac, R ; Haguenauer, M ; Miné, P ; Mironov, C ; Nguyen, M ; Ochando, C ; Paganini, P ; Sabes, D ; Salerno, R ; Sirois, Y ; Veelken, C ; Zabi, A ; Agram, J.-L ; Andrea, J ; Bloch, D ; Bodin, D ; Brom, J.-M ; Cardaci, M ; Chabert, E.C ; Collard, C ; Conte, E ; Drouhin, F ; Ferro, C ; Fontaine, J.-C ; Gelé, D ; Goerlach, U ; Juillot, P ; Le Bihan, A.-C ; Van Hove, P ; Fassi, F ; Mercier, D ; Beauceron, S ; Beaupere, N ; Bondu, O ; Boudoul, G ; Chasserat, J ; Chierici, R ; Contardo, D ; Depasse, P ; El Mamouni, H ; Fay, J ; Gascon, S ; Gouzevitch, M ; Ille, B ; Kurca, T ; Lethuillier, M ; Mirabito, L ; Perries, S ; Sordini, V ; Tosi, S ; Tschudi, Y ; Verdier, P ; Viret, S ; Tsamalaidze, Z ; Anagnostou, G ; Beranek, S ; Edelhoff, M ; Feld, L ; Heracleous, N ; Hindrichs, O ; Jussen, R ; Klein, K ; Merz, J ; Ostapchuk, A ; Perieanu, A ; Raupach, F ; Sammet, J ; Schael, S ; Sprenger, D ; Weber, H ; Wittmer, B ; Zhukov, V ; Ata, M ; Caudron, J ; Dietz-Laursonn, E ; Duchardt, D ; Erdmann, M ; Fischer, R ; Güth, A ; Hebbeker, T ; Heidemann, C ; Hoepfner, K ; Klingebiel, D ; Kreuzer, P ; Lingemann, J ; Magass, C ; Merschmeyer, M ; Meyer, A ; Olschewski, M ; Papacz, P ; Pieta, H ; Reithler, H ; Schmitz, S.A ; Sonnenschein, L ; Steggemann, J ; Teyssier, D ; Weber, M ; Bontenackels, M ; Cherepanov, V ; Flügge, G ; Geenen, H ; Geisler, M ; Haj Ahmad, W ; Hoehle, F ; Kargoll, B ; Kress, T ; Kuessel, Y ; Nowack, A ; Perchalla, L ; Pooth, O ; Rennefeld, J ; Sauerland, P ; Stahl, A ; Aldaya Martin, M ; Behr, J ; Behrenhoff, W ; Sharif University of Technology
    APS  2012
    Abstract
    The dimuon invariant mass spectrum is searched in the range between 5.5 and 14GeV for a light pseudoscalar Higgs boson a, predicted in a number of new physics models, including the next-to-minimal supersymmetric standard model. The data sample used in the search corresponds to an integrated luminosity of 1.3fb -1 collected in pp collisions at √s=7TeV with the CMS detector at the LHC. No excess is observed above the background predictions and upper limits are set on the cross section times branching fraction σ×B(pp→a→μ +μ -) in the range of 1.5-7.5pb. These results improve on existing bounds on the abb̄ coupling for m am Υ(3S). Constraints... 

    Electrically rotating suspended films of polar liquids

    , Article Experiments in Fluids ; Volume 50, Issue 2 , August , 2011 , Pages 419-428 ; 07234864 (ISSN) Shirsavar, R ; Amjadi, A ; Tonddast Navaei, A ; Ejtehadi, M. R ; Sharif University of Technology
    Abstract
    Controlled rotation of a suspended soap water film, simply generated by applying an electric field, has been reported recently. The film rotates when the applied electric field exceeds a certain threshold. In this study, we investigate the phenomenon in films made of a number of other liquids with various physical and chemical properties. Our measurements show that the intrinsic electrical dipole moments of the liquid molecules seems to be vital for the corresponding film rotation. All the investigated rotating liquids have a molecular electric dipole moment of above 1 Debye, while weakly polar liquids do not rotate. However, the liquids investigated here cover a wide range of physical... 

    Rotation rate estimation in parametrically excited micro gyroscopes

    , Article Mechatronics ; Volume 31 , October , 2015 , Pages 264-275 ; 09574158 (ISSN) Fazlyab, M ; Salarieh, H ; Alasty, A ; Sharif University of Technology
    Elsevier Ltd  2015
    Abstract
    This paper reports the estimation of angular velocity in micro gyroscopes with parametric excitation. The identification procedure is done into two consecutive steps: In the first step, the physical parameters of the gyroscope (stiffness, damping, and actuator parameters) are estimated via continuous time Extended and Unscented Kalman filter. In the second step, a separate Kalman filter is dedicated to estimate the time varying rotation rate, using the output of the first step. Using numerical simulations, it is found that by introducing an artificial noise in the observer equations and tuning its variance, arbitrary temporal variation of angular velocity can be well tracked by the proposed... 

    Moon shadow on high energy cosmic ray in data of a small extensive air shower array

    , Article Astroparticle Physics ; Volume 33, Issue 5-6 , 2010 , Pages 330-334 ; 09276505 (ISSN) Sheidaei, F ; Bahmanabadi, M ; Samimi, J ; Sharif University of Technology
    2010
    Abstract
    Data from a small air shower array were used to examine the cosmic ray shadow of the Moon at energies more than 100 TeV. A simple technique has been used for the analysis of this data. In this technique the number of EAS events with arrival directions falling in error circles centered about the moving moon is compared to the mean number of events falling in error circles with centers randomly chosen in the sky. For any assumed angular radius of the error circle the deficit in EAS event count in the direction of moon which is a moon-related effect is interpreted as the shadow of the moon. A simple theoretical model has been developed to relate the mean number of EAS events, Nsky, to the... 

    Computational study on design parameters of a solar chimney

    , Article International Conference on Sustainable Mobility Applications, Renewables and Technology, 23 November 2015 through 25 November 2015 ; 2015 ; 9781467395298 (ISBN) Esfidani, M. T ; Raveshi, S ; Shahsavari, M ; Sedaghat, A ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc 
    Abstract
    Today, the production of energy and electricity is one of the major concerns of mankind. Electricity generation by solar energy is considered as one of the alternatives to fossil fuels. Solar chimneys mechanism is based on a natural phenomenon. In this process the solar energy heat up the earth's surface and the surrounding air. Due to the density difference between cold air and warm air, heated air ascends and causes air circulation. In this study, mathematical modelling of solar chimney and governing equations of this system will be discussed. In order to validate the numerical results, upwind velocity in chimney has been compared with a reliable reference results. As well as, the... 

    Parameter identification of a parametrically excited rate micro-gyroscope using recursive least squares method

    , Article Scientia Iranica ; Volume 24, Issue 4 , 2017 , Pages 1889-1900 ; 10263098 (ISSN) Mohammadi, Z ; Salarieh, H ; Sharif University of Technology
    Sharif University of Technology  2017
    Abstract
    Estimation of physical parameters of a parametrically excited gyroscope is studied in this paper. This estimation is possible by reading the input and output data of the gyroscope. Because of different faults in the manufacturing process and tolerances, physical parameters of a gyroscope are not exactly same as the expected values of the manufacturer. Moreover, changing of temperature, humidity, external acceleration, etc. can change the physical parameters of the gyro. Thus, the physical parameters of gyroscope are not fixed values and may deviate from the desired designed values. The physical parameters of gyroscope determine the optimal region for working of gyroscope. Thus, if the... 

    Effects of physical parameters on the accuracy of axial flux resolvers

    , Article IEEE Transactions on Magnetics ; Volume 53, Issue 4 , 2017 ; 00189464 (ISSN) Alipour Sarabi, R ; Nasiri Gheidari, Z ; Tootoonchian, F ; Oraee, H ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2017
    Abstract
    Axial flux resolvers (AFRs) are used in motion control of electrical machines. In this paper, the effects of physical parameters on the accuracy of detected position are studied. The examined parameters are width of slot opening and slot width, number of poles, number of slots per pole and per phase, and skewing of rotor slots. An analytical model based on the winding function method is proposed for the first time in to estimate the error of position signal. The results of the analytical method are verified with 3-D time stepping finite-element method. Finally, the prototype of the studied AFR is constructed and tested. Good agreement between simulation and experimental results confirms the... 

    Effect of the wet outlet geometry on the shockwave position in supersonic separators

    , Article Chemical Engineering and Technology ; Volume 43, Issue 1 , January , 2020 , Pages 126-136 Majidi, D ; Farhadi, F ; Sharif University of Technology
    Wiley-VCH Verlag  2020
    Abstract
    Supersonic separators (3Ss) are applied in gas separation processes. Two-dimensional simulation is employed to investigate the effect of operational and thermophysical parameters on the shockwave position. In addition, the impact of the cyclonic part and wet outlet geometry is evaluated by proposing four cases. Increasing the length of the cyclonic part exerts positive and negative influences on the performance of the 3S and the pressure recovery coefficient, respectively. The optimum length is determined between 10 and 15 cm. To demonstrate negative effects of wasted air from the wet outlet, its flow has been increased from 3.6 to 8.1 % of the inlet flow. Improved performance of the 3S is... 

    Modeling vibrational behavior of silicon nanowires using accelerated molecular dynamics simulations

    , Article Scientia Iranica ; Volume 27, Issue 2 , 2021 , Pages 819-827 ; 10263098 (ISSN) Nejat Pishkenari, H ; Delafrouz, P ; Sharif University of Technology
    Sharif University of Technology  2021
    Abstract
    The classical methods utilized for modeling nano-scale systems are not practical because of the enlarged surface e ects that appear at small dimensions. Contrarily, implementing more accurate methods is followed by prolonged computations as these methods are highly dependent on quantum and atomistic models, and they can be employed for very small sizes in brief time periods. In order to speed up the Molecular Dynamics (MD) simulations of the silicon structures, Coarse-Graining (CG) models are put forward in this research. The procedure involves establishing a map between the main structure's atoms and the beads comprising the CG model and modifying the parameters of the system so that the... 

    Simulation of thermal radiation in a micropolar fluid flow through a porous medium between channel walls

    , Article Journal of Thermal Analysis and Calorimetry ; Volume 144, Issue 3 , 2021 , Pages 941-953 ; 13886150 (ISSN) Ahmad, S ; Ashraf, M ; Ali, K ; Sharif University of Technology
    Springer Science and Business Media B.V  2021
    Abstract
    Among numerous methods which have been employed to reinforce the thermal efficiency in many systems, one is the thermal radiation which is a mode of heat transfer. Another way to improve the thermal efficiency is the utilization of the porous media. The present work includes the study of micropolar flow with allowance for thermal radiation through a resistive porous medium between channel walls. The governing coupled partial differential equations representing the flow model are transmuted into ordinary ones by using the suitable dimensionless coordinates, and then, quasi-linearization is employed to solve the set of relevant coupled ODEs. Effects of physical parameters on the flow under...