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Articles by M.A. Choudhury
Total Records ( 2 ) for M.A. Choudhury
  R. Razali , A.N. Abd Alla , M.A. Choudhury and P.K. Shadhu Khan
  Researchers as well as the industries have great interest in energy efficient operation of Induction Motor Drives (IMD). This can be achieved if the IMD is operated at its maximum efficiency under different loading conditions. In this study, the on-line voltage/current V/I control scheme to operate IMD at its maximum efficiency is introduced. The steady-state per phase equivalent circuit of induction motor is used to derive the V/I reference expressions. The control method requires supplied current, voltage, frequency and motor constants to achieve the maximum efficiency operating region. The V/I algorithm is realized through a control software and single-chip 3-phase AC motor controller, MC3PHAC supervised by Personal Computer (PC). Experimental result shows that V/I ratio under different loading conditions met the targeted value by changing the modulation index. The proposed method is suitable to low horsepower HVAC motors where oversize and/or have a wide load variation.
  M. M. Rahman , A.B.S.M. Osman Gani , M.A. Choudhury and M.H. Rahman
  The binding of dexamethasone phosphate (DP) and testosterone phenyl propionate, (TPP) two semisynthetic steroids, to bovine serum albumin (BSA) was studied by equilibrium dialysis method at 25°C and pH 7.4 with a view to have an insight into the competitive binding characteristics of these two drugs, when bound to BSA simultaneously. There was increase in free concentration of DP due to addition of TPP and vice versa during concurrent administration of these two drugs, thereby causing reduced binding of these two drugs to BSA. However, the free fraction was not increased up to a level as it was expected from direct competitive displacement. In absence of the site I specific probe (warfarin sodium), DP after being displaced by TPP or vice versa from its high affinity binding site (site II) rebound to its low affinity binding site (site I) on BSA. However, when the site I was sufficiently blocked by warfarin, the increment in the free concentration of the displaced drug was more prominent. This form of modified displacement has been referred to as site-to-site displacement.
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