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Articles by T. Islam
Total Records ( 2 ) for T. Islam
  M.A. Hashem , T. Islam , M.A. Hossain , M.T. Kamal , M.A. Sun and M.M. Rahman
  The study was aimed to understand the production performances of Jamuna basin lambs at different ages from some selected areas of Sherpur district. For this purpose, growth performance data on 360 lambs were collected from October 2018 to September 2019. Statistical analyses were done using SPSS-v-20 version computer software. The means of body weight of Jamuna basin lambs were 1.46±0.01, 3.58±0.05, 6.65±0.10, 9.84±0.25, 14.74±0.74 and 17.00±0.63 kg, respectively at birth, one, three, six, nine and twelve months of age. Sex had significant effect (p<0.05) at six month of age. Body weight and average daily gains were higher in male than female lambs at different ages. Litter size had highly significant effect (p<0.001) on birth weight and weight at one month of age. Single born lamb had higher birth weight and average daily gain than twins and triplets. A significant (p<0.05) effect was found on the weight at three months of age due to seasonal influence. Average Daily Gain (ADG) from one, three, six, nine and twelve month was found 119.33±2.25 & 119.00±2.20, 73.89±2.17 & 71.67±2.45, 54.67±4.03 & 54.83±4.67, 54.59±2.30 & 52.59±3.60 and 51.34±3.59 & 46.27±4.11 g/day, respectively in location wise. Mortality was relatively higher within 3 month of age. The improvement in litter size, body weight and survival represent potentially significant economic advantage of Jamuna basin lamb. In conclusion, sex, litter size, body weight, season, location and flock size used in the study are important source of variation for growth traits in Jamuna basin lamb.
  Z. Chik , T. Islam , M.M. Mustafa , H. Sanusi , S.A. Rosyidi and M.R. Taha
  This study addresses wavelet transform for multichannel surface wave method to overcome the limitations of conventional seismic signal analysis. Seismic surface wave method is familiar nondestructive seismic test to reveal the soil profile in geotechnical engineering. The spectral analysis surface wave method using two receivers is constraint due to interferences of other signals and various types of noises. To reduce these problems, the multichannel analysis of surface wave method is developed as more reliable surface wave technique with the performance of mode discrimination. But this method is tedious and slower for phase velocity extraction using Fourier transform. However, because of characteristic of fourier transform used in the conventional phase extraction method, dispersion curve is sensitive to background noise and body waves in the low frequency range. Furthermore, under some field conditions such as pavement site, the phase extraction method can lead to erroneous dispersion curve. To overcome these problems, a new method of determining the group velocities and phase velocities using time frequency analysis based on Complex Morlet wavelet transform is highlighted with the algorithm in this study. To estimate the applicability of the proposed method, the dispersion curve at soil layer profile is revealed and the dispersion curve by proposed method is more reliable than those by the usual phase extraction method. The significance of this study is to obtain a robust and consistent performance with noise reduction for surface wave analysis regarding multichannel and Morlet wavelet transform.
 
 
 
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