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Articles by M. Hasanuzzaman
Total Records ( 10 ) for M. Hasanuzzaman
  M.A. Hakim , A.S. Juraimi , M. Begum , M. Hasanuzzaman , M.K. Uddin and M.M. Islam
  Problem Statement: Groundwater is an important source of freshwater for agricultural, drinking and domestic uses in many regions of the world including Bangladesh. Demand of groundwater has been increasing day by day for irrigation by bringing more area under cultivation. As a drinking water the bottled water market currently has an average annual growth rate of 7.4% between 2002 and 2007, which is parallel to the growth of this industry all over the world. Obviously, the feed water should be free of particles and colloidal material and as low as possible in soluble organic matter. Series of water quality problems have been identified and addressed since the 1950s. These include point and non-point source pollutants such as nutrients, hydrocarbons, pesticides and heavy metals. In this regard, some studies to assessment the quality of water had been conducted in world wide. Where as, a Chiribandar a selected southern part of Bangladesh has great importance in agriculture and industrial perspective, no study has been done yet to asses the ground water quality for agricultural, drinking and industrial uses. Approach: A research was conducted to assess the degree of ionic toxicity of groundwater sources as irrigation, drinking and industrial purposes. Twenty eight groundwater samples were analyzed for different elements of dominant cations and anions such as Ca, Mg, Na, K, Fe, HCO3 and other minor ions P, B, As, N03-N, S04-S and Cl. In addition, to classify water quality as excellent, good suitable, Sodium Adsorption Ratio (SAR), Soluble Sodium Percentage (SSP) and Residual Sodium Carbonate (RSC) were calculated following standard equations. The quality of water is generally judged by its total salts concentrations, relative proportion of cations or Sodium Absorption Ratio (SAR) and the contents of HCO3. Results: According to the concentration of cation and anion constitutes of groundwater, water quality of study area were suitable for irrigation, drinking and industrial purposes. Except for a few cases there was neither chloride toxicity nor sulphate acidity in the area. The content for NO3- and P was negligible and water samples were 'good' to 'excellent' with respect to boron and SSP. Range of EC (361-802 ┬ÁS cm-1) and that of SAR (0.23-0.54) indicated that all samples were in 'medium-salinity low-alkali' hazard class. In respect of TDS and RSC values, all samples were of fresh water and suitable class. Among SSP and SAR, TDS and EC were highly correlated. An Arsanic range was far below than recommended upper limit. Conclusion/Recommendations: In respect of all evaluating criteria, groundwater of all the 28 locations can be safely used for long-term irrigation and drinking purposes. All samples were found suitable for drinking and industrial purpose in consideration of Fe concentration. However, none of the water samples was suitable for industrial use, because of higher TDS and pH values exceeding recommendation.
  M.A. Rahman , E. Haque , M. Hasanuzzaman and I.Z. Shahid
  The present study investigated pharmacological activities to provide scientific basis to traditional usage of Tamarix indica. Phytochemical analysis of the dried roots of Tamarix indica (Tamaricaceae) indicated the presence of alkaloids, glycosides, flavonoids, saponins and tannins. The pharmacological interest of these compounds, coupled with the use of this plant in traditional medicine prompted the researchers to check for its possible antinociceptive, anti-inflammatory and antibacterial activities in animal models. The antinociceptive activity was studied using acetic acid-induced writhing in mice while anti-inflammatory tests were studied by using carrageenin induced rat paw edema model. Moreover, antibacterial activities were studied by using the disc diffusion method. The extract produced significant writhing inhibition in acetic acid-induced writhing in mice at the oral dose of 500 mg kg-1 body weight (p<0.001) comparable to the standard drug diclofenac sodium at the dose of 25 mg kg-1 of body weight. When given orally to rats at dose of 200 and 400 mg kg-1, the extract showed a significant (p<0.001) anti-inflammatory activity against carrageenin induced paw edema in rats comparable to the standard drug aspirin. Moreover, The extract of Tamarix indica exhibited significant in vitro antibacterial activity against Staphylococcus saprophyticus, Shigella sonnie, Salmonella typhi, Vibrio cholera, Streptococcus epidermidis, Shigella flexneri and Staphylococcus aureus with the zones of inhibition ranging from 10.76 to 16.34 mm. The obtained results provide a support for the use of this plant in traditional medicine and its further investigation.
  R. Saidur , H.H. Masjuki , M. Hasanuzzaman and G.S. Kai
  This study carried out the field survey from house to house to garner the information of consumer behavior. In this study the energy consumption 104 refrigerators have been monitored as well. The energy consumption of 104 refrigerators is clustered and segmented to classify the refrigerators of same characteristic in the same group. The capacity of the refrigerator, frequency of door opening and position of refrigerator either near heat source or away from the heat source is considered for clustering and segmentation analysis. The clustering and segmentation in this survey reveal the effect of these factors on the energy performance of the refrigerator.
  R. Saidur , M.I. Jahirul , M. Hasanuzzaman and H.H. Masjuki
  Experiments were conducted to investigate the engine`s emission at the different operating conditions. The tests were conducted by varying the engine speed, throttle opening and operating time. During the experimental investigation, the operating variables were varied (engine speed from 1500 to 2500 rpm; throttle percentage from 25 to 36% and operating time from 2.5 to 5 min) according to the experimental schedule set up. These emission models reveal the effects of each parameter`s significance and adequacy for the design range which evaluated using ANOVA F-test. The effects of each parameter in emission response are studied through the response model. From the comparative evaluation of the experimental results for the different operating conditions, it is revealed that there is an influence of the engine speed, throttle position and operating time. From the analysis, it is concluded that emissions are more affected on engine speed and throttle position.
  R. Saidur , M. Hasanuzzaman , M.M. Hasan and H.H. Masjuki
  This study presents the Overall Thermal Transfer Value (OTTV) and the energy consumption of room air conditioners of the residential buildings in Malaysia. A survey has been conducted to investigate the OTTV and the energy consumption of room air conditioners of the residential buildings in Malaysia. OTTV calculation, energy consumption and effect of the building parameters on energy consumption have been investigated. It is found that OTTV of the residential buildings in Malaysia varied from 35 to 65 W m-2 with a mean value of 41.7 W m-2. The sensitivities of several parameters such as window to wall ratio (WWR), Shading Coefficient (SC), U-value for wall (Uw) and solar absorption (α) are provided to design and optimize the thermal performance of residential buildings. It is found that U and α influence more on OTTV compared to other parameters. The analysis shows that about 14, 10 and 5% of residential building air conditioners have annual electricity consumption in the ranges 500 to 1000 kWh, 1000 to 2000 kWh and 7500 to 10000 kWh, respectively. The maximum, minimum and average annual electricity consumption of the air conditioner of residential buildings is 22055.5, 136.1 and 3708.8 kWh, respectively.
  M. Hasanuzzaman , R. Saidur and H.H. Masjuki
  This study presents the effects of different operating variables on energy consumption of refrigerator-freezer that had two phases. The first phase is to investigate the effects of the number of door opening, duration of each door remain open, ambient temperature, cabinet load and thermostat setting position on energy consumption during the open door conditions. The second phase is to investigate the effects of the ambient temperature, cabinet load, thermostat setting position and open surface water pan area inside the cabinet on energy consumption during the closed door conditions. All the experiments were conducted in the environmental controlled chamber. The result shows that there is a great influence of different variables on energy consumption and average consumption is about 3.3 kWh day-1. The effects of number of door opening, ambient temperature and cabinet load are more compared to the others. The open door energy consumption is 40% more compared to the closed door test. It is found that the average of the maximum energy consumption is 27.3% more compared to average consumption and 55.6% more compared to average of the minimum consumption. If the users be serious, a significant amount of energy could be saved with the proper utilization of refrigerator-freezer.
  M.A. Rahman , E. Haque , M. Hasanuzzaman , S.R. Muhuri and I.Z. Shahid
  Pistia stratiotes (Araceae) is a Bangladeshi medicinal plant used traditionally to treat a various diseases. The present study was designed to investigate of antinociceptive and antidiarrhoeal activity of methanolic extract of the leaves of Pistia stratiotes. The extract produced significant writhing inhibition in acetic acid-induced writhing in mice at the oral dose of 250 and 500 mg kg-1 body weight (p<0.001) comparable to the standard drug diclofenac sodium at the dose of 25 mg kg-1 of body weight. The extract showed antidiarrhoeal activity on castor oil induced diarrhoea in mice, it increased mean latent period and decreased the frequency of defecation significantly at the oral dose of 250 and 500 mg kg-1 body weight (p<0.01) comparable to the standard drug Loperamide at the dose of 50 mg kg-1 of body weight. The obtained results provide a support for the use of this plant in traditional medicine and its further investigation.
  M. Hasanuzzaman , B.K. Biswas , M.S. Alam , H.F. El-Taj and M.R. Amin
  A total of 33 indigenous cultivars of sorghum [Sorghum bicolor (L.) Moench] were grown in replicated trial during rabi season of 1999 to assess genetic divergence based on ten developmental characters. The genotypes were grouped into five clusters. Amongst ten characters, grains/panicle paid maximum contribution towards genetic divergence. The inter-group distances were much longer than the intra-group distances. Cluster III was the largest with 11 genotypes and the cluster II was the smallest with 2 genotypes. Cluster III showed the maximum genetic distance (207.43) from cluster V. Simultaneous consideration of intercluster and intra cluster distances 7 genotypes of cluster I were genetically worthful to initiate the crossing programme for high heterotic effects in segregants. Cluster II exhibited the maximum intra cluster distance (3.15) and had considerable genetical divergence from rest of the clusters. Thus, 2 genotypes belonging to cluster II might be hybridized with the genotypes of other clusters for getting desirable improvement of specific traits in sorghum.
  Azizunnesa , B.C. Sutradhar , M. Hasanuzzaman , M.A.K. Azad and S. Kumar
  The study was conducted at dairy and cattle improvement farm, Hathazari, Chittagong for a period of one year. A total of 82 dairy cows were selected during the period from June 03-July 04 and their information regarding milk production upto 180 days, productive and other reproductive parameters were recorded from farm record book. Average milk production (459.09 ± 138.09 liter), calving interval (634.59 ± 223.92 days), age at puberty (1205.02 ± 313.80 days), service per conception (1.88 ± 1.09), gestation length (273.08 ± 7.48 days) and birth weight of fetuses (18.78 ± 34 kg) were observed. The minimum and maximum value of these results was also observed. The highest milk production (487.54 ± 109.73 liter) was found in the cows with parity number 4-8 and the second highest (456.84 ± 169.58 liter) was found with the parity number 2 and the lowest milk production (445.79 ± 86.64 liter) was found with the parity number 3. The average production of milk was observed (473.44 ± 134.15 liter) in the cows required interval between 370-590 days and 444.74 ± 142.11 liter found in the cows required 591-1365 days. When the range of age at puberty was 1186-2270 days and 665-1185 days the average production of milk was 468.56 ± 161.92 liter and 450.50 ± 113.56 liter was observed, respectively. Comparatively more milk production was found (461.52 ± 151.89 liter) in cows required less number of services per conception was 1-2 than the cows required more number of services per conception was 3-6 and their milk production was 452.84 ± 96.60 liter. There was no any significance difference of production of milk among the different variables.
  M. A. Azad , M. Hasanuzzaman , Azizunnesa , G. C. Shil and M. A. Barik
  The present research work was undertaken to identify the quantitative and qualitative trends of milk production of Baghabarighat Milk Shed Area of Milk Vita throughout the year from January, 2001 to December, 2005. It was observed that milk production trend of BMSA statistically significant (P<0.05) between different months or season of each year during the said period, and the average values of milk production of different years (2001-2005) were also statistically significant (P<0.05). It was also found that milk production of BMSA was 53.29 TL/day. From the study it was also revealed that the highest milk production was in February (10.01%) and lowest in September (6.46%) and milk production gradually increased from September to February which was indicated a specific milk production trend throughout the year. Fat and SNF production was little highest in December to April.
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