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Articles by Md. Abul Kalam Azad
Total Records ( 3 ) for Md. Abul Kalam Azad
  Md. Abul Kalam Azad , Katsumi Ishikawa , A.K. Chowdhury and Naima Islam
  The research was undertaken in order to assess effects of different extraction periods to extract exchangeable zinc (Zn) in some soils of Bangladesh. Six soils from different sites in Bangladesh such as Tea soil, Madhupur soil, Ishurdi soil, Saline soil, Farm soil (Bangladesh Agricultural University, BAU) and poorly drained soil were collected for extracting zinc with various extraction periods using EDTA (ethylenediamine tetra acetate), HCl, ASI (Agro service international) and CH3COONH4 (ammonium acetate) as extractant materials. The six different extraction periods applied in this study were 1, 2, 4, 8, 16 and 24 h for the assessment of suitable period in releasing exchangeable Zn at maximum levels, was chalked out. The results showed that the maximum amount of Zn was extracted significantly from the maximum soils within the beginning hours (1, 2 and 4 h) of extraction period, although the quantity of Zn increased with the elapse of time up to 8 h, but these increments were not identically differentiated. An exception occurred in the poorly drained soil, this soil with all the reagents exhibited significant increments of Zn extracted by the periods from 1 to 8 h. The amount of exchangeable zinc extracted by CH3COONH4 increased gradually along with the extraction periods up to 4 h and then the changes were not significantly happened with the rest experimental periods (8, 16 and 24 h). The average amount of extractable Zn was higher by HCl and lower by ASI, as well as the highest concentration of extracted Zn observed with the minimum extraction period of 4 h in applying the maximum reagents for all the soils. The results apparently suggest that the 4 h extraction period could be considered as suitable for extracting zinc, cause it exposed the maximum extraction of exchangeable soil Zn compared to other periods.
  Md. Abul Kalam Azad
  This study aims at assessing the effect of different treatments on Kochi tap water of Japan with different materials belonging to various parameters. Granular ceramics and alumina having electrochemical charges at the surface were produced in a fluidization system with tap water. Ceramics and alumina were used as fluidizing agents in the experiment and three different amounts of these materials for each experiment were passed through the fluidizing layer in three separate selected periods. Results showed that after each treatment with Kochi tap water of Japan, pH and surface tension (ST) increased, oxidation-reduction potential (ORP) decreased as compared with untreated water and the values of electrical conductivity (EC) did not change significantly in the same experimental conditions. During fluidization process of water with ceramics and alumina, water flows through the granular substances and every particle comes into contact with each other in a frictional way. Resultantly, the raising temperature of disperse medium and oxidation-reduction reactions have been taken place which were considered as the possible reasons for changing the values of pH, ORP, ST and EC in this experiment. After treatments, other than the changing values of ST and EC, the increasing and decreasing tendencies of pH and ORP from their initial values were preferable for drinking and agriculture.
  Md. Abul Kalam Azad , A.H. Khan , S.M. Badier Rahman , M. Kamal Uddin and M.A. Samad
  The properties of mattress cover which was produced by the rotor spun jute-cotton (80:20 and 70:30) blended yarn were studied and compared with the properties of mattress cover produced by 100% cotton yarn. It was observed that the average warp wise strength and abrasion resistance of 80:20 blended fabric were comparable and very closer to that of the 100% cotton fabric. On the other hand average warp wise strength and bursting strength of 80:20 blended fabrics were very nearer to the 100% cotton fabric.
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