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Articles by R. Hamid
Total Records ( 2 ) for R. Hamid
  A.S.M.Z. Hasan , R. Hamid , A.K. Ariffin and R. Gani
  Dynamic behavior of concrete specimen can be studied using experimental method such as Split Hopkinson Pressure Bar Test. This test is tedious to conduct and costly too. However, it can be simulated by using finite element method. This study investigated the dynamic behavior of concrete based on finite element method under high strain rate. The dynamic stress-strain behavior for cylindrical concrete specimen is studied with 36 mm diameter and 36 mm length under the strain rate of 350, 500 and 700 sec-1, respectively. The results indicate that the peak stress of cylindrical concrete specimen increase with the increase of strain rate. The peak stresses are found 28.6, 39.9 and 76.3 MPa at ultimate strain of the values of 0.0055, 0.0077 and 0.011 under the stress rate 350, 500 and 700 sec-1, respectively. The highest concentrations of stresses are found at the center of the concrete specimen under the stress rate 350 and 500 sec-1 whereas, the highest concentration of stress is observed at the outer surface of concrete under the stress rate 700 sec-1. The comparative study shows that numerical results of present identification substantially agreed with the experimental results. Therefore, the numerical analysis can be widely used to identify the stress-strain behavior of concrete under the high strain rate. The significance of this study is to give the proper guideline for the selection of concrete model for stress-strain analysis of normal strength concrete under high strain rate.
  H. Bashir , T. Khan , A. Masood and R. Hamid
  A purification scheme was developed to purify a lectin from the seeds of a local Kashmiri variety of Glycine max (soybean). The lectin that specifically binds to N- acetyl galactosamine was purified to electrophoretic homogeneity by affinity chromatography on CNBr activated Sepharose 6B column. Human blood group A, B, O and AB erythrocytes were used for agglutination assay and the sugar specificity was determined by hemagglutination inhibition assay. Protein estimation was done by Lowry’s method and analysis was done by PAGE both under native conditions and in presence of SDS. The purified soybean lectin (SBL) showed equal agglutination with all four types of blood groups i.e., A, B, O and AB. Hemagglutinating activity of the lectin is inhibited by N- acetyl galactosamine and galactose and other carbohydrates containing the galactopyranosyl residue. The purified lectin gave a single symmetric protein peak on gel filtration chromatography showing a molecular weight of 110 kDa and when subjected to native PAGE, showed a single protein band. A single band of 30 kDa was obtained upon SDS-PAGE, establishing that the lectin is composed of similar subunits i.e., it is a homotetramer.A tetrameric galactose specific lectin that shows equal activity with all blood type human erythrocytes was purified and characterized from a Kashmiri variety of soybean.
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