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Articles by M.R. Alam
Total Records ( 4 ) for M.R. Alam
  M.S. Alam , M.R. Alam and K.K. Islam
  In this paper, a qualitative energy flow analysis in Bangladesh agriculture has been made for a period from 1980-81 to 2000-01 to evaluate the impact of energy input to produce output. Human & animal muscle power and machinery energy for tillage operation, electricity and diesel energy for irrigation, fertilizer and pesticides energy for growth and protection are taken into account. Energy values are calculated by multiplying respective quantity by their respective energy equivalents with the use of relevant conversion factors. Energy flow studied based on some energy dependent indicators: energy input per ha, energy output per ha, energy output to input ratio, mechanization index, energy input to generate per unit GDP output as well as per unit output in energy term and solar energy conversion efficiency. During the study period, energy input and output to Bangladesh agriculture were increased from 6.4 to 17.32 GJ ha¯1 and 72.22 to 130.05 GJ ha¯1, respectively. It is found that energetic efficiency (energy output to input ratio) was declined from 11.28% to 8.1%, which indicates that the energy input increased faster than energy output. It is expected that sustainable energy flow in Bangladesh agriculture can be ascertained by this study.
  M.R. Alam , M.B.I. Reaz and M.A.M. Ali
  The activities of residents in smart homes possess temporal information which can be used to classify and model psychological behavior of the resident. In this study, a learning algorithm is proposed to predict the activity interval of smart home inhabitants. The algorithm is based on the hypothesis that residents’ activity intervals follow a normal distribution. To predict the starting time of the following activity, it incrementally utilizes mean and standard deviation of previous history which are applied according to the central limit theory of statistical probability. The prediction algorithm exhibits 88.3 to 95.3% prediction accuracies for different ranges of mean and standard deviations when verified by practical smart home data. Further stochastic analyses prove that the time difference between the residents’ activities follows normal distribution which was merely an assumption previously.
  B. Roy , M.R. Alam , Bikash C. Sarker , M.S. Rahman , M.J. Islam , M.A. Hakim and R.I. Mahmood
  An experiment was conducted on naturally occurring growth substances in aqueous extracts of some common weeds viz., Bathua (Chenopodium album), Bhijli ghas (Striga densiflora), Shetdrone (Leucus aspera), Mutha (Cyperus rotundus ), Chapra (Eleusine indica) and Khude Anguli (Digitaria ischaemum) with the attempt for chemical investigation on effective extracts. Boiled and unboiled extracts of all the weed species under test significantly reduced and delayed germination of wheat and jute seeds compared with control. The highest germination (96 and 85.3%) and maximum growth of wheat and jute were observed in seeds treated with control. The effect of boiled and unboiled extracts of Bathua (Chenopodium album) showed the lowest germination in seeds of wheat. The root and shoot length of wheat and jute were also decreased in presence of the weed extracts. The thin layer chromatography (TLC) examination of crude extract of Khude Anguli (Digitaria ischaemum) showed four separate compound at hex: ethyl acetate (20:1, v/v) and the crude extract of Bathua (Chenopodium album) showed three separate component at hex: ethyl acetate (10:1, v/v).
  M.R. Alam , M.A.R. Sarkar , K.M. Khalequzzaman , Md. Nazrul Islam , M.K. Anam and Md. Abdur Rahim
  The experiment was conducted to find the effect of different cultivars and time of nitrogen application on the growth and yield of separated tillers of transplant aman rice. Tillers of three rice cultivars (BRRI Dhan 32, BR 23 and BR 22) and five timings of nitrogen application were used as treatments. The individual effect of var. BR 23 and the three equal splits of application of nitrogen as basal, at early tillering and at panicle initiation stages gave the best results on plant height, no. of tillers hill-1, no. of leaves hill-1, leaf area index, no. of grains panicle-1, weight of 1000 grains, grain yield, straw yield, biological yield and harvest index having 121.21 and 122.54 cm, 9.10 and 9.26, 36.72 and 39.91, 4.92 and 4.68, 118.60 and 118.50, 23.98 and 22.33 g, 4.55 and 4.79 t ha-1, 6.15 and 6.60 t ha-1, 10.70 and 11.40 t ha-1, 42.62 and 41.24 %, respectively. The interaction effect of var. BR 23 and T2 was the highest on these parameters. Rice var. BR 23 and three splits of nitrogen application may be used for increasing growth and yield of separated tillers of transplanted aman rice.
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