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Articles by Md. Abdus Salam
Total Records ( 3 ) for Md. Abdus Salam
  Nazar Elfadil , Zia Nadir , Md. Abdus Salam and Ravi
  The cellular mobile communication industry has recently been one of the fastest growing industries. Need for high quality and high capacity networks, estimating coverage accurately has become extremely important. The generic RF propagation prediction algorithms based on empirical results give only approximate coverage, and are not suitable for detailed network design. Therefore for more accurate design coverage of modern cellular networks, signal strength measurements must be taken in the service area using a test transmitter. Measuring signal strength is an expensive and a time consuming task. It is known that the accuracy of coverage estimation increases with the distance of the signal strength measurement drive route. Propagation path loss model is the fundamental method of predicting the range of a mobile system. The accuracy of the path loss predictions is a crucial point to determine whether a particular system design will be viable. Therefore, this paper presents how a variety of possible methods exist that allow the engineer to predict the path loss with sufficient speed and accuracy and it is vital that a prediction method that engineers are confident in is adopted before the network designed. This paper also addresses the comparisons between the theoretical propagation model, empirical propagation model and the practical measurement.
  Md. Abdur Rahman Sarkar , Md. Hasan Kabir , Mahfuza Begum and Md. Abdus Salam
  An experiment was carried out to study the effect of planting date and plant density on the yield and yield attributes of five varieties of mungbean. The experiment comprised of four planting dates viz. 03 February,18 February, 05 March and 20 March, five varieties viz. BARIMung-2, BARIMung-3, BARIMung-4, BARIMung-5 and BINA Mung-2 and three planting densities viz., 20x20 cm, 30x10 cm and 40x30 cm. The experiment was laid out in a split-split plot design with three replications. It was observed that early planted (03 and 18 February) crops produced higher yield as compared to late planted (05 and 20 March) crops. Variety BARIMung-2, BARIMung-3 and BARIMung-4 produced higher seed yield as compared to variety BARIMung-5 and BINAMung-2.The 30x10 cm plant density always showed the highest yield performance. Variety BINAMung-2 produced the highest branches plant-1 when planted on 03 February at a spacing of 40x30 cm. The highest pods plant-1 was found in the variety BARIMung-3 when planted at a density of 30x10 cm and planted on 18 February. Pod length was the highest in variety BARIMung-5 planted on 05 March with a plant density of 20x20 cm. The highest 1000- seed weight was obtained in case of variety BARIMung-5 planted on 03 February at densities of 20x20 cm and 30x10 cm. Variety BARIMung-2 planted on 3 February at plant density of 30x10 cm significantly produced the highest seed yield and harvest index and the lowest seed yield and harvest index were found in the variety BARIMung-3 planted on 20 March at a plant density of 40x30 cm.
  Md. Shahidur Rahman , Md. Asraful Haque and Md. Abdus Salam
  The experiment was carried out at the field laboratory of Bangladesh Institute of Nuclear Agriculture, Mymensingh, during amon season (July to October, 2001) to study the effects of different tillage practices on growth, yield and yield contributing characters of BRRI Dhan-33. The crop was grown under supplemented irrigation condition. The soil was calcarious grey belonging to Sonatola series of old Brahmaputra flood plain. The treatment of this study comprised of power tiller with 1, 2, 3 and 4 passes at 7 and 15 cm depth and 4 passes with country plough at normal depth. The 4 passes at 15 cm deep ploughing by power tiller showed the highest yield of grain (4.95 t ha-1) and straw (5.89 t ha-1) which was associated with higher leaf area index (LAI), crop growth rate (CGR), net assimilation rate (NAR), total dry matter (TDM), leaf numbers/hill, plant height, number of total and effective tillers, panicle length, number of filled grains/spikelets/panicle and with lower number of non-bearing tillers/hill and sterile spikelets/panicle. The lowest values of all parameters were found in 1 pass with power tiller at both 7.5 and 15 cm depth. Though 4 passes with country plough at normal depth and 3 passes with power tiller at 15 cm depth showed statistically identical results of 4 passes with power tiller at 15 cm depth in respect of yield performance, this treatment (4 passes with power tiller at 15 cm depth) gave the highest yield practically.
 
 
 
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