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Articles by F. Talati
Total Records ( 3 ) for F. Talati
  F. Talati and S. Jalalifar
  In this research, two major models are used for calculation of frictional heat generation: namely macroscopic and microscopic model. In the macroscopic model, the law of conservation of energy or First Law of Thermodynamics is taken into account. And for the microscopic model, parameters such as the duration of braking, velocity of the vehicle, dimensions and geometry of the brake system, materials of the disk brake rotor and the pad are taken into account. For calculation of prescribed heat flux boundary condition in this model two kinds of pressure distribution is considered: uniform wear and uniform pressure. In high demand braking applications, vented disks consisting of two rubbing surfaces separated by straight radial vanes are normally employed as they utilize a greater surface area to dissipate heat. Within this paper the conduction heat transfer into a high performance passenger car front brake disk has been investigated using Finite Element Method.
  M.H. Djavareshkian , F. Talati , A. Ghasemi and S. Sohrabi
  In this research, combustion process in the combustion chamber of a DI diesel engine is simulated. Afterwards, results obtained from the multidimensional simulation of the combustion process are used in analytical solution of the heat conduction in cylinder wall. An eddy break-up combustion model and a diesel auto-ignition model were implemented to simulate the ignition and combustion process. All the simulations were carried out by the use of FIRE CFD tool. Numerical results were validated via experimental data for OM_355 DI diesel engine for mean cylinder pressure. The results show that there have been good agreements between experimental data and the CFD calculations. The research demonstrated that the combination of multidimensional CFD simulation and analytical methods is useful for diesel engine wall heat transfer modeling. Effect of cylinder wall material, insulation material and thickness were studied in order to obtain lower heat rejection from the combustion chamber. Using cast iron instead of alluminium for cylinder material, using insulation and increasing the insulation thickness resulted in lower outer wall temperature and heat flux.
  H. Khoshnoud , N. Nemati , R. Amirnia , M. Ghiyasi , A. Hasanzadeh Ghourttapeh , M. Tajbakhsh , F. Talati and H. Salehzadeh
  Tissues of higher plants contain novel natural substances that can be used to develop environmental safe methods for insect control. In this study, ethanol extract from flowers of Verbascum cheiranthifolium Boiss. (Scrophulariaceae) was examined for their effect on mortality and progeny production against adults of Rhyzopertha dominica (F.) on two commodities, wheat and barley. The botanical extract was applied at five dose rates, which 0.25, 0.5, 1.0, 2.0 and 3% (w/v). Adults of R. dominica were exposed to the treated wheat and peeled barley at 25 °C and 65% RH and mortality was assessed after 24 h, 48 h, 7 day, 14 day and 21 day of exposure. Then all adults were removed and the treated substrate remained at the same conditions for an additional 45 day after this interval, the commodities were checked for progeny production. In two commodities mortality increased with the increase of dose and exposure interval. Results indicated that on wheat, mortality was 100% after 14 days of exposure at the highest dose rate. Whereas, in the same conditions mortality of adults on barley was 63%. Thus plant extract was more effective against adults of R. dominica on wheat than application of barley. Interestingly in two diets, complete suppression (100%) of the progeny production was observed in the treated wheat and barley than in control even in the lowest dose rate.
 
 
 
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