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Articles by M. A. Islam
Total Records ( 8 ) for M. A. Islam
  A. K. Mozumder , M. R. Ullah , A. Hossain and M. A. Islam
  Problem statement: Quenching and cooling are important process in manufacturing industry for controlling the mechanical properties of materials, where evaporation is a vital mode of heat transfer. Approach: This study experimentally investigated the evaporation of sessile drop for four different heated surfaces of Aluminum, Brass, Copper and Mild steel with a combination of four different liquids as Methanol, Ethanol, Water and NaCl solution. The time of evaporation for the droplet on the hot metallic surface was measured and compared with a proposed correlation as well. With the time temperature plot of these experimental data, the Leidenfrost phenomena had been elucidated. In the pool boiling curve for liquid, just after the transition boiling region and before the film boiling region, the heat transfer approaches its minimum value. The corresponding temperature of this minimum value was termed as the Leidenfrost temperature and the phenomenon is known as Leidenfrost phenomena. According to the experimental data, the Leidenfrost temperature was within a range of 150-200°C for all the experimental conditions. Results: This revealed that Leidenfrost temperature was independent of thermo-physical properties of solid and liquid. Sessile drop evaporation time was the maximum for water, then decreases gradually for Nacl solution, methanol and was the minimum for ethanol for a particular solid material. On the other hand, this time was the highest for copper and the lowest for mild steel for a specific liquid. Conclusion: The experimental data for the evaporation time fairly agree with the proposed correlation within a certain range. The collected time and temperature data may be used as a good data bank for the researchers.
  M. A. Islam and S. F. Ahmed
  Problem statement: Jet impingement quenching has a very effective and large cooling potential and is a very effective means of cooling for many applications. It gives rise to heterogeneous and/or homogeneous nucleation of bubbles, which is yet to be explored. Approach: Analytically investigate the phenomenon that happened during a brief contact of a water jet impinging on a hot surface. In particular, explore the possibility of homogeneous bubble formation during jet impingement quenching. A simple semi-infinite conduction heat transfer model was considered in this case and the heat transfer analysis had been carried out for two heating cases of the impinging liquid, namely with (i) Prescribed Surface Temperature (PST-case) and (ii) Time-dependent Surface Temperature (TST-case). For each of above cases, explicit equations for temperature distribution within liquid, average liquid temperature, average internal energy and surface heat flux had been derived as a function of liquid depth and contact time. These equations were solved numerically and their outcomes were discussed. Furthermore, a critical contact time, t* at which the temperature on the opposite side of the liquid depth reached saturation temperature, Tsat was determined. The heat flux (qs) at time t* was also determined and compared with the thermodynamic limit of the maximum heat flux (qmax) which decided the validity of this analytical investigation. Results: During jet impingement quenching of hot surfaces near/above the thermodynamic limiting temperature, water stored enough energy for a contact period of 5-10 μs depending on the type of boundary conditions considered for triggering homogeneous bubble nucleation. A contact time of 4μs was required to trigger homogeneous bubble nucleation for the conditions where the impinging surface had a fixed temperature throughout the cooling process. A contact time of 6.5 μs was required to initiate homogeneous bubble nucleation for the conditions where the impinging surface temperature dropped at a rate depending on time. For both cases, the average internal energy of the liquid exceeded the minimum energy necessary for bubble formation. Moreover, the average heat flux, q never exceeded the thermodynamic limit of the maximum heat flux, qmax. Conclusion: When water was heated above the thermodynamic limit of superheat during jet impingement, there is always a chance of homogeneous bubble nucleation.
  M. R. Zaman , M. Y. Ali , M. A. Islam and A. B. M. M. Islam
  The experiment was carried out by crossing Jamunapuri male with Black Bengal female goat to assess the heterosis of productive and reproductive traits of F1 and F2. F1 and F2 for birth weight, live weight at 3, 6, 9 and 12 months of age, pre and post- weaning body weight gain, and litter size was significantly better than that of Black Bengal goat. However, F1 was found to be higher than that of F2. But pre-weaning survival rate was higher in Black Bengal goat than that of F1 and F2 crossbreds. Pre-weaning gain was higher than post-weaning gain in all populations. Heterosis of birth weight, live weight at 3,6,9 and 12 months of age, pre and post weaning gain, litter size and pre-weaning survival rates were 17.19, 23.35, 12.93, 7.44 and 5.71, 36.34, 31.87,15.38 and -4.82% for F1 and 8.60, 11.67, 6.46, 3.72, 2.86 and 18.17, 15.94, 7.69 and -2.41% for F2 respectively at location 1. But at location -2, heterosis of birth weight and pre-weaning survival rate were 24.79 and 16.54% for F1 and 12.40 and 8.27% for F2 respectively.
  A.K. Hira , M. Y. Ali , M. Chakraborty , M. A. Islam and M.R. Zaman
  Proximate components, effect of water-hyacinth leaves (WHL), digestibility of different nutrients of WHL and its nutritive value were determined in the Animal Nutrition Laboratory, Bangladesh Agricultural University, Bangladesh to utilize WHL as feed for goat. Twelve Black Bengal goats of similar age, size and sex were divided into 4 groups having 3 goats in each and fed diets; A (100% Dhal grass- DG) to I , B (75% DG+25% WHL) to II, C (50% DG+50% WHL) to III, and D (100% WHL) to group IV up to 60 days. All the goats were provided 200g-concentrate mixture every day. Goats of group IV were used to determine the digestibility of various nutrients in water-hyacinth leaves. Water-hyacinth leaves contained higher percentage of crude protein, nitrogen free extract and organic matter, and lower percent of crude fibre than Dhal grass. Body weight gain, feed intake and feed conversion efficiency were not significant among the groups. Daily weight gain was 29, 27, 23, and 17g in group I, II, III and IV respectively. Feed conversion efficiency was 16.19, 17.99,18.26 and 24.27 in group I, II, III and IV respectively. Daily dry matter intake in group I, II, III and IV were 0.47, 0.49, 0.42 and 0.42 kg respectively. Average COD of dry matter, crude fibre, ether extract and nitrogen free extract in water-hyacinth leaves were 58.39, 65.38, 59.97, 60.09 and 48.97% respectively. Average digestible nutrients; DCP, DCF, DEE, DNFE and TDN of water-hyacinth leaves were 11.81, 13.60, 2.28, 14.98 and 45.54% respectively.
  M. Y. Ali , M. A. Islam , M. J. Alam and M. N. Islam
  Yogurt samples from ten different shops of Mymensingh Town and Laboratory made in 3 batches were analyzed in the Dairy Technology Laboratory, Department of Dairy Science, Bangladesh Agricultural University to monitor the quality. Significant difference in overall score of physical test (smell and taste, body and consistency, colour and texture), chemical (protein, fat, total solids, ash, acidity and PH) and microbiological status was found among different yogurt samples. Laboratory made yogurt was the best in quality. Dayamoy and Anil Gosh were in 2nd and 3rd position in quality of yogurt. This investigation suggested that adulterated milk must be avoided in yogurt preparation and also to follow strict hygienic condition in order to have
  Ahmed, M. H. , M. A. Islam , M. A. Kader and M. P. Anwar
  A field experiment was conducted during the Kharif season (June to November) of 1998 at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh to study the effect of point placement of urea super granule (USG) and broadcasting prilled urea (PU) as sources of N in Transplant aman rice. One hybrid variety (Hybrid rice 6201) and one modern inbred variety (BRRI Dhan 32) were included in the experiment. USG and PU were applied at 40, 80, 120 or 160 Kg N ha–1. A control (no N) treatment was also included in the experiment. Hybrid rice 6201 produced significantly longer panicle and higher number of total spikelets panicle–1 but showed poor performance regarding all other yield parameters. A considerable difference was noted between these two varieties in respect of spikelet sterility where Hybrid rice 6201 produced almost the double of sterile spikelets than that of BRRI Dhan 32 which ultimately led to inferior grain yield (3.25 t ha–1). On the other hand, BRRI Dhan 32 produced taller plants, higher number of effective tillers hill–1, grains panicle–1 and heavier grains which eventually contributed to higher grain yield (3.85 t ha–1). USG was more efficient than PU at all respective levels of nitrogen in producing all yield components and in turn, grain and straw yields. Placement of USG at 160 kg N ha–1 produced the highest grain yield (4.32 t ha–1) which was statistically identical to that obtained from 120 kg N ha–1 as USG and significantly superior to that obtained from any other level and source of N.
  M. Ahmed , R. Jalil , M. A. Islam and S. M. Shaheen
  The investigation was carried out by the addition of variable percentages (0, 2, 4, 8 and 12%) of either Aluminum Stearate (AS) or Dioctyl Sodium Sulphosuccinate (DOSS) in Glycerol Monostearate (GMS)-based suppositories of Diclofenac Sodium (DS). DS suppositories of GMS base were prepared using AS and DOSS separately in different formulations by pour moulding method. Dissolution studies were carried out in USP Dissolution Tester using phosphate buffer (pH 7.4) as the dissolution medium maintaining the temperature at 37±2°C. The effects of AS and DOSS were evaluated on the release rate of DS from the GMS-based suppositories. The hydrophobic nature of GMS retarded the drug release markedly, while the inclusion of increasing percentage of AS and DOSS in GMS-based suppositories enhanced the release rate of DS to a considerable extent. Throughout the investigation, the release patterns in both cases were found to be square root of time dependent; indicating diffusion type of drug release. Formulation of DS suppositories with 12% DOSS gave sustained drug release profile. The stability studies of the DS suppositories containing 12% as well as DOSS have proved these formulations to be stable dosage forms.
  A. K. Das , M. Y. Ali , M. A. Islam , A. K. Hira and S. Z. Ali
  The experiment was carried out at Central Cattle Breeding Station and Dairy farm, Savar, Dhaka, and 3 sub- station and 9 points of Chandpur District in Bangladesh to evaluate the quality and fertilizing capacity of locally produced chilled and imported frozen semen. Motility, sperm concentration and mass activity of semen from different experimental bulls were almost similar. Quality of imported frozen semen was better than that of locally produced chilled semen in respect of motility, motile sperm/ Insemination dose and spermatozoa with normal head. Motility and pH value of semen decreased significantly for transportation and prolongation of preservation duration. Average conception rate of imported frozen semen (57.33) was found to be higher than locally produced chilled semen (45.33). But it was similar between imported frozen (57.33) and average of 1st & 2nd day preserved semen (57%).
 
 
 
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