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Ta'if, Saudi Arabia

Taif University is located in Ta’if Saudi Arabia.It was established in 2004. Wikipedia.

The effect of using dual alcohols (n-butanol and iso-butanol) blended into gasoline fuel on spark-ignition (SI) engine performance and pollutant emissions is experimentally investigated. Three blend rates are applied (3, 7 and 10 vol.% iso-butanol and n-butanol) as well as the neat gasoline as a base fuel; such dual blends are thought the first of their kind in internal combustion engines. The engine performance (brake power, BP, torque, Tq, volumetric efficiency, VE, pressure inside cylinder, P, and exhaust gas temperature, EGT) and pollutant emissions of CO, UHC (unburned hydrocarbons) and CO2 were examined at engine speeds of 2600-3400 r/min for each blend rate and base fuel. In addition, engine performance and pollutant emissions of dual alcohols/gasoline blends were compared with those of single alcohol/gasoline blends, e.g., iso-butanol-gasoline and n-butanol-gasoline blends. Results demonstrate a higher performance and lower emissions when engine operated with dual alcohols/gasoline blends, compared to single ones. Dual alcohols with 10 vol.% of n-butanol/iso-butanol blended in gasoline monitored the best performance and emissions among all the fuel blends (single or dual alcohols). However, results showed also a decrease in VE, BP, Tq, P and EGT when engine operated with the dual alcohols compared to base fuel. Nevertheless, performance of the dual alcohols can exceed those of the base fuel by increasing the blend rate value. Besides, dual alcohols burn cleaner than regular gasoline and produce slighter CO, CO2 and UHC pollutants by about 4.3%, 40% and 11%, respectively, compared to base fuel. © 2015 Elsevier Ltd. All rights reserved. Source

Mohsen Q.,Taif University
Journal of Alloys and Compounds | Year: 2010

Magnetic materials are important electronic materials that have a wide range of industrial and commercial applications. Barium hexaferrite (BaFe 12O 19), is of great importance as permanent magnets, particularly for magnetic recording as well as in microwave devices. An aim of this study was to synthesize stoichiometric and single phase barium hexaferrite by a technique of oxalate precursor. Effect of different annealing temperature on the particle size, microstructure and magnetic properties of the resulting barium hexaferrite powders has been studied, and reported in the presented paper. The Fe 3+/Ba 2+ mole ratio was controlled at 12, while the annealing temperature was controlled from 800 to 1200 °C. The resultant powders were investigated by differential thermal analyzer (DTA), X-ray diffractometer (XRD), scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM). Single well crystalline BaFe 12O 19 phase was obtained at annealing temperature 1200 °C. The SEM results showed that the grains were regular hexagonal platelets. In addition, maximum saturation magnetization (66.36 emu/g) was observed at annealing temperature 1100 °C. However, it was found that the coercivity of the synthesized BaFe 12O 19 samples was lower than the theoretical values. © 2010 Elsevier B.V. All rights reserved. Source

In this paper, exhaust emissions and engine performance have been experimentally studied for neat gasoline and gasoline/n-butanol blends in a wide range of working speeds (2600-3400 r/min) without any tuning or modification on the gasoline engine systems. The experiment has the ability of evaluating performance and emission characteristics, such as break power, torque, in-cylinder pressure, volumetric efficiency, exhaust gas temperature and concentrations of CO2, CO and UHC. Results of the engine test indicated that using n-butanol-gasoline blended fuels slightly decrease the output torque, power, volumetric efficiency, exhaust gas temperature and in-cylinder pressure of the engine as a result of the leaning effect caused by the n-butanol addition; CO, CO2 and UHC emissions decrease dramatically for blended fuels compared to neat gasoline because of the improved combustion since n-butanol has extra oxygen, which allows partial reduction of the CO and UHC through formation of CO2. It was also noted that the exhaust emissions depend on the engine speed rather than the n-butanol contents. © 2014 Elsevier Ltd. All rights reserved. Source

Intermolecular charge-transfer or proton-transfer complexes between the drug procaine hydrochloride (PC-HCl) as a donor and quinol (QL), picric acid (PA) or 7,7′,8,8′-tetracyanoquinodimethane (TCNQ) as a π-acceptor have been synthesized and spectroscopically studied in methanol at room temperature. Based on elemental analyses and photometric titrations, the stoichiometry of the complexes (donor:acceptor molar ratios) was determined to be 1:1 for all three complexes. The formation constant (KCT), molar extinction coefficient (* epsiv;CT) and other spectroscopic data have been determined using the Benesi-Hildebrand method and its modifications. The newly synthesized CT complexes have been characterized via elemental analysis, IR, Raman, 1H NMR, and electronic absorption spectroscopy. The morphological features of these complexes were investigated using scanning electron microscopy (SEM), and the sharp, well-defined Bragg reflections at specific 2θ angles have been identified from the powder X-ray diffraction patterns. Thermogravimetric analyses (TGAs) and kinetic thermodynamic parameters were also used to investigate the thermal stability of the synthesized solid CT complexes. Finally, the CT complexes were screened for their antibacterial and antifungal activities against various bacterial and fungal strains, and only the complex obtained using picric acid exhibited moderate antibacterial activity against all of the tested strains. © 2012 Elsevier B.V. All rights reserved. Source

Alaoui C.,Taif University
IEEE Transactions on Vehicular Technology | Year: 2013

Battery thermal management system (BTMS) is essential for electric-vehicle (EV) and hybrid-vehicle (HV) battery packs to operate effectively in all climates. Lithium-ion (Li-ion) batteries offer many advantages to the EV such as high power and high specific energy. However, temperature affects their performance, safety, and productive life. This paper is about the design and evaluation of a BTMS based on the Peltier effect heat pumps. The discharge efficiency of a 60-Ah prismatic Li-ion pouch cell was measured under different rates and different ambient temperature values. The obtained results were used to design a solid-state BTMS based on Peltier thermoelectric coolers (TECs). The proposed BTMS is then modeled and evaluated at constant current discharge in the laboratory. In addition, The BTMS was installed in an EV that was driven in the US06 cycle. The thermal response and the energy consumption of the proposed BTMS were satisfactory. © 2012 IEEE. Source

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