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| 1 | Effect of Nano Clay on Corrosion Protection of Zinc-rich Epoxy Coatings on Steel 37显示文摘Epoxy zinc rich coatings containing clay nanoparticles were prepared and the effect of clay content on the cathodic protection performance of the coatings was evaluated by electrochemical impedance spectroscopy(EIS) and immersion test. Open circuit potential(OCP) measurements and immersion tests were also carried out to better understand the behavior of zinc rich coating. EIS and OCP measurements showed that addition of 1 wt% clay improved the cathodic protection duration and sacrificial properties of the epoxy zinc rich coating. Transmission electron microscopy(TEM) photographs confirmed that clay nanoparticles were successfully dispersed in the coating matrix loaded with 1 wt% clay. Immersion test results indicated that addition of 1 wt% clay nanoparticles in zinc rich epoxy coatings increased the cathodic protection ability of coatings. | Farhad Tohidi Shirehjini Iman Danaee Hadi Eskandari Davood Zarei | 2016 | Journal of Materials Science & Technology2016，32，11： | 9 |
| 2 | Maximum Power Point Tracking in Variable Speed Wind Turbine Based on Permanent Magnet Synchronous Generator Using Maximum Torque Sliding Mode Control Strategy显示文摘The present study was carried out in order to track the maximum power point in a variable speed turbine by minimizing electromechanical torque changes using a sliding mode control strategy. In this strategy, first, the rotor speed is set at an optimal point for different wind speeds. As a result of which, the tip speed ratio reaches an optimal point, mechanical power coefficient is maximized, and wind turbine produces its maximum power and mechanical torque. Then, the maximum mechanical torque is tracked using electromechanical torque. In this technique, tracking error integral of maximum mechanical torque, the error, and the derivative of error are used as state variables. During changes in wind speed, sliding mode control is designed to absorb the maximum energy from the wind and minimize the response time of maximum power point tracking(MPPT). In this method, the actual control input signal is formed from a second order integral operation of the original sliding mode control input signal. The result of the second order integral in this model includes control signal integrity, full chattering attenuation, and prevention from large fluctuations in the power generator output. The simulation results, calculated by using MATLAB/m-file software, have shown the effectiveness of the proposed control strategy for wind energy systems based on the permanent magnet synchronous generator(PMSG). | Esmaeil Ghaderi Hossein Tohidi Behnam Khosrozadeh | 2017 | Journal of Electronic Science and Technology2017，15，4： | 3 |
| 3 | On the evaluation of steam assisted gravity drainage in naturally fractured oil reservoirs显示文摘Steam Assisted Gravity Drainage(SAGD)as a successful enhanced oil recovery(EOR)process has been applied to extract heavy and extra heavy oils.Huge amount of global heavy oil resources exists in carbonate reservoirs which are mostly naturally fractured reservoirs.Unlike clastic reservoirs,few studies were carried out to determine the performance of SAGD in carbonate reservoirs.Even though SAGD is a highly promising technique,several uncertainties and unanswered questions still exist and they should be clarified for expansion of SAGD methods to world wide applications especially in naturally fractured reservoirs.In this communication,the effects of some operational and reservoir parameters on SAGD processes were investigated in a naturally fractured reservoir with oil wet rock using CMG-STARS thermal simulator.The purpose of this study was to investigate the role of fracture properties including fracture orientation,fracture spacing and fracture permeability on the SAGD performance in naturally fractured reservoirs.Moreover,one operational parameter was also studied;one new well configuration,staggered well pair was evaluated.Results indicated that fracture orientation influences steam expansion and oil production from the horizontal well pairs.It was also found that horizontal fractures have unfavorable effects on oil production,while vertical fractures increase the production rate for the horizontal well.Moreover,an increase in fracture spacing results in more oil production,because in higher fracture spacing model,steam will have more time to diffuse into matrices and heat up the entire reservoir.Furthermore,an increase in fracture permeability results in process enhancement and ultimate recovery improvement.Besides,diagonal change in the location of injection wells(staggered model)increases the recovery efficiency in long-term production plan. | Seyed Morteza Tohidi Hosseini Shayan Esfahani Mehran Hashemi Doulatabadi Abdolhossein Hemmati Sarapardeh Amir H.Mohammadi | 2017 | Petroleum2017，3，2： | 2 |
| 4 | Experimentalmeasurement of methane and carbon dioxide clathratehydrate equilibria in mesoporous silica显示文摘 | Anderson R Llamedo M Tohidi B | 2003 | Journal ofPhysical Chemistiy B2003，107，15： | 1 |
| 5 | Visual observation of gas - hydrate formation and dissociation in porous media by means of glass micromodels显示文摘 | Tohidi B Anderson R Clennell M B | 2001 | Geology2001，29，9： | 1 |
| 6 | Low-pressure molecular hydrogen storage in semi-clathrate hydrates of quaternary ammonium compounds 显示文摘 | CHAPOY A ANDERSON R TOHIDI B | 2007 | J Am Chem Soc2007，，129： | 1 |
| 7 | Characterization of Inhibition Mecha- nisms of Kinetic Hydrate Inhibitors Using Ultrasonic Test Technique 显示文摘 | Yang Jinhai Tohidi B | 2011 | Chem Eng Sci2011，66，3： | 1 |
| 8 | Gas hydrategrowth and dissociation in narrow pore networks: capillaryinhibition and hysteresis phenomena显示文摘 | Anderson R Tohidi B Webber J B W | 2009 | GeologicalSociety London Special Publications2009，319，： | 1 |
| 9 | Visual Observation of Gas-hydrate Formation and Dissociation in Synthetic Porous Media by Means of Glass Micro Models显示文摘 | Tohidi B Anderson R Clennell M B | 2001 | Geology2001，29，9： | 1 |
| 10 | Modelling single and mixed electrolyte solutions and its applications to gas hydrates显示文摘 | Tohidi B Danesh A Todd A C | 1995 | Chem Eng Res Des1995，，： | 1 |
| 11 | Effect of Primary Parameters on the Performance of PEM Fuel Cell显示文摘 | Tohidi M Mansouri S H Amiri H | | 0，，17： | 1 |
| 12 | Evaluation organizational learning capability and product innovation performance显示文摘 | TOHIDI H JABBARI M | 2012 | Procedia Technology2012，，1： | 1 |
| 13 | Carbon monoxide clathrate hydratesp: Equilibrium data and thermodynamic modeling 显示文摘 | Mohammadi A H Anderson R Tohidi B | 2005 | AIChE J2005，51，： | 1 |
| 14 | Effect of primary parameters on the performance of PEM fuel cell 显示文摘 | TOHIDI M MANSOURI S H AMIRI H | 2010 | International Journal of Hydrogen Energy2010，35，17： | 1 |
| 15 | Gas hydrate growth and dissociation in narrow pore networks: Capillary inhibition and hysteresis phenomena显示文摘 | ANDERSON R TOHIDI B WEBBER J B W | 2009 | The Geological Society2009，319，： | 1 |
| 16 | Characteristics of clathrate hydrate equilibria in mesopores and interpretation of experimental data显示文摘 | Anderson R Llamedo M Tohidi B | 2003 | Journal of Physical Chemistry2003，107，15： | 1 |
| 17 | Thermodynamic prediction of clathrate hydrate dissociation conditions in mesoporous media显示文摘 | Llamedo M Anderson R Tohidi B | 2004 | Am Mineral2004，89，： | 1 |
| 18 | The prevalence of poly- cystic ovary syndrome in a community sample of Iranian popula- tion : Iranian PCOS prevalence study显示文摘 | Tehrani FR Simbar M Tohidi M | 2011 | Reprod Biol Endoerinol2011，9，： | 1 |
| 19 | Prevalence of gestmional di- abetes melitus in southern Iran (Bandar Abbas City) 显示文摘 | Hadaegh F Tohidi M Harati H | 2005 | Endocr Pract2005，11，5： | 1 |
| 20 | A frequent pattern miningalgorithm based on FP-growth without generating tree 显示文摘 | TOHIDI H IBRAHIM H | 2010 | Proceedings of Knowledge Management 5th InternationalConference2010，，34： | 1 |
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