http://hdl.handle.net/10361/31 2013-05-19T04:22:06Z http://hdl.handle.net/10361/2084 BRAC University Postgraduate Prospectus 2010 BRAC University 2010-01-01T00:00:00Z http://hdl.handle.net/10361/2082 BRAC University Annual Report 2010 BRAC University 2010-12-31T00:00:00Z http://hdl.handle.net/10361/1802 A comparative study on dispersivity of Arsenic among Surma, Sari and Volaganj sand Islam, Shriful; Rahman, M.S.; Das, R.K. Transport mechanism of Arsenic (As) through the Surma, Sari and Volaganj sand is the prime concern of this study. Three column leaching tests were performed to find the dispersivity property of As. Numerous physical properties of these sand samples were determined and it shows Volaganj sand is most permeable. From the collected data experimental and theoretical breakthrough curve (BTC) were prepared and compared with each other. The value of dispersion coefficient and Index of dispersion were calculated. Dispersion coefficient (773.763cm2/min) and index of dispersion (844.3cm2/min) was higher for Surma sand. The leaching rate was found higher for higher pore water velocity of the Volaganj sand. The study also reveals that there is a significant difference between theoretical and experimental breakthrough curve. So not only convection/dispersion but also other processes such as adsorption, reaction with other compound are associated with the movement of arsenic through the sand medium. 2011-01-01T00:00:00Z http://hdl.handle.net/10361/1801 Use of Mustard oil as an alternative and renewable substitute of Fossil diesel Hasib, Z.M.; Rahman, K.A.; Alam, M.M. Energy is the prerequisite for modern civilization. Fossil fuel is still the main source of energy. But the endless consumption of fossil fuel has brought its reserve about to an end. As a result, fuel prices are growing as a consequence of spiraling demand and diminishing supply. So we are always in search of alternative and cost effective fuels, to meet our need. Diesel engines are more efficient and costeffective than other engines. So diesel engines have versatile uses (i.e. automobiles, irrigation, power plants etc.). That is why; consumption of diesel fuel is much higher than other gasoline fuels. This paper estimates the feasibility of mustard oil as an alternative fuel for diesel engine. Mustard is a renewable plant, widely growing in almost everywhere in Bangladesh. In this study, mustard oil is converted to bio-diesel by well known trans-esterification reaction. Bio-diesel has different fuel properties than diesel fuel. So other than modification of the engine or the fuel supply system, blends of bio-diesel (i.e. B20, B30, B50 etc,) has been used. Finally, a comparison of engine performance for different blends of bio-diesel has been carried out to choose the correct blend for different operating conditions. 2011-01-01T00:00:00Z