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Mottaleb, M.A.,Sarma, D.K.,Sultana, S.,Husain, M.M.,Alam, S.M.M.,Salehuddin, S.M. Korean Chemical Society 2003 Bulletin of the Korean Chemical Society Vol.24 No.1
A liquid-liquid extraction followed by evaporative concentration method was used to determine the concentration of normal, or straight chain, saturated hydrocarbons (NSH) $(C_{10}\;to\;C_{24})$ and polycyclic aromatic hydrocarbons (PAH) here defined as: fluorene, anthracene, pyrene, chrysene and perylene, in the Buriganga River water of Bangladesh. Samples were collected from 5 and 25 cm depth of water at the southern, middle and northern parts of the river at Postogolla, Sadarghat and Sowarighat stations. Hydrocarbons were extracted from 450 mL of water into 75 mL n-hexane and then concentrated into 1 or 2 mL solution by evaporation. These solutions were analyzed by gas chromatography. The highest and lowest concentrations were determined as $257\;{\mu}gL^{-1}\;for\;C_{13}\;and \;0.24\;{\mu}g\;L^{-1}\;for\;C_{22}$ at 5 ㎝ depth of water, at the northern part of the Sowarighat and southern part of the Postogolla, respectively. This method could allow the analysis of water for $C_{22}$ as low as $0.24\;{\mu}g\;L^{-1}$.
김광용(K.Y. Kim),이기돈(K.D. Lee),문미애(M.A. Moon),허만웅(M.W. Heo),김현민(H.M. Kim),김진혁(J.H. Kim),Afzal Husain 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5
This paper presents numerical analysis and design optimization of various turbine blade cooling techniques with three-dimensional Reynolds-averaged Navier-Stokes(RANS) analysis. The fluid flow and heat transfer have been performed using ANSYS-CFX 11.0. A fan-shaped hole for film-cooling has been carried out to improve film-cooling effectiveness with the radial basis neural network method. The injection angle of hole, lateral expansion angle of hole and ratio of length-to-diameter of the hole are chosen as design variables and spatially averaged film-cooling effectiveness is considered as an objective function which is to be maximized. The impingement jet cooling has been performed to investigate heat transfer characteristic with geometry variables. Distance between jet nozzle exit and impingement plate, inclination of nozzle and aspect ratio of nozzle hole are considered as geometry variables. The area averaged Nusselt number is evaluated each geometry variables. A rotating rectangular channel with staggered array pin-fins has been investigated to increase heat transfer performance and to decrease friction loss using KRG modeling. Two non-dimensional variables, the ratio of the eight diameter of the pin-fins and ratio of the spacing between the pin-fins to diameter of the pin-fins selected as design variables. A rotating rectangular channel with staggered dimples on opposite walls are formulated numerically to enhance heat transfer performance. The ratio of the dimple depth and dimple diameter are selected as geometry variables.
SENSOR ELIMINATION IN SWITCHED RELUCTANCE MOTOR DRIVES: AN OVERVIEW AND STATE OF THE ART
M.Ehsani,I.Husain,K.R.Ramani,S.Mahajan 전력전자학회 1992 ICPE(ISPE)논문집 Vol.1992 No.4
Advantages of the switched reluctance motor (SRM) drives make it an attractive candidate for replacing many adjustable speed ac and dc drives in both industrial and consumer applications. The simple, low cost and robust SRM drive can be efficiently operated in hostile environments, such as under the hood of an automobile. The purpose of this paper is to introduce the basic SRM drive concept and present some of the recent shaft sensor and current sensor elimination concepts and new converters which have<br/> been developed to further simplify this motor drive.
ECR plasma etching of GaAs in CCl2F2/Ar/O2 discharge and IR studies of the etched surface
L. S. S. Singh,K. P. Tiwary,R. K. Purohit,Z. H. Zaidi,M. Husain 한국물리학회 2005 Current Applied Physics Vol.5 No.4
The etching of GaAs materials under electron cyclotron resonance conditions has been performed in an ECR etching system withrf biasing using the CCl2F2/Ar/O2 plasma chemistry. Etching experiments were carried out at a pressure between 0.015 and 0.020mbar, rf power 0.39 W/cm2, and dc bias voltage 200 V. The surface morphology and etch depth were taken by scanning electronmicroscopy and Dektek Prolometry respectively. The use of ECR conditions with additional rf biasing provides the good etchingof the surface and fast etch rates. Moreover, the surface of the GaAs material display smooth and stoichiometric surfaces at higherECR powers. The surface damages on the GaAs samples after the plasma exposure have been studied using IR spectroscopy..
Khan, F.,Baek, S.H.,Singh, S.N.,Singh, P.K.,Husain, M.,Kim, J.H. Association for Applied Solar Energy ; Elsevier Sc 2014 SOLAR ENERGY -PHOENIX ARIZONA THEN NEW YORK- Vol.110 No.-
A systematic study of hydrogen sintered aluminum rich zinc oxide (AZO) films is made from the view point of their application as surface passivation layer for silicon solar cell. AZO films of various Al and Zn molar concentration ratios (0<R<SUB>Al/Zn</SUB><40%) are made and their electrical and optical properties are studied. The lowest surface recombination velocity (~10cm/s) is realized in the film with R<SUB>Al/Zn</SUB>~30% as inferred from minority carrier lifetime measurements. The passivation effect of AZO layer may be attributed to presence of hydrogen whose concentration is maximum (~3.93x10<SUP>22</SUP>atoms/cm<SUP>3</SUP>) for R<SUB>Al/Zn</SUB>~30%. Effect of surface passivation is manifested in the efficiency of solar cell where an improvement>4% vis-a-vis the control cell (without AZO layer) is seen after AZO layer is applied on the rear surface of the cell.