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Articles by M.A. Mannan
Total Records ( 4 ) for M.A. Mannan
  M.A. Mannan , M. Nagano , K. Shigezumi , T. Kida , N. Hirao and Y. Baba
  Boron carbonitride (BCN) thin films with a thickness of ~4 μm were synthesized on Si (100) substrate by radiofrequency and microwave plasma enhanced chemical vapor deposition using trimethylamine borane [(CH3)3N.BH3)] as a molecular precursor. The microstructures of the films were evaluated using field emission scanning electron microscopy (FE-SEM) and X-ray diffractometry (XRD). Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) were used to analyze the chemical bonding state and composition of the films. It has been observed that the films were adhered well to the silicon substrate even after being broken mechanically. XRD and FE-SEM results showed that the films were x-ray amorphous, rough surface with inhomogeneous microstructure. The micro hardness was measured by nano-indentation tester and was found to be approximately 2~7 GPa. FT-IR suggested the formation of the hexagonal boron carbonitride (h-BCN) phase in the films. Broadening of the XPS peaks revealed that B, C and N atoms have different chemical bonds such as B-N, B-C and C-N. The impurity oxygen was detected (13~15 at.%) as B-O and/or N-O.
  K.M. Earfan Ali , M.S. Hossain and M.A. Mannan
  In this study attempt has been made to formulate a model for marriage according to the age difference associated with marriage and Muslim community. For this a single parameter exponential distribution has been proposed and compared with the pareto-exponential function. It was found the exponential distribution provided a good approximation at the survey area and therefore was considered suitable to describe the age associated with marriage in a Muslim community.
  M.A. Mannan , R. Tasmin , M.A. Hossain , M. R. Ali , M. Zaman and M. Kader
  Malathion 57EC and Diazinon 60EC with different doses (1 ml, 2 ml and 3 ml/L water) were tested to evaluate the effect on mustard aphids and their toxicity on the predators and other beneficial insects of mustard aphid. Malathion was more effective than Diazinon for the control of aphids and it was less toxic for the predators and other beneficial insects. The lower dose of insecticides have less adverse effect on the predators and other beneficial insects than the higher dose.
  M.A. Mannan , S.A.K.U. Khan , M.R. Islam , M. Sirajul Islam and Ayesha Siddiqa
  Fruit characteristics of some mango varieties grown in Khulna region were studied at the Horticulture Laboratory, Agrotechnology Discipline of Khulna University, Khulna during the period from March to December, 2002. The objectives of the experiment were to evaluate the pattern of physico-chemical properties of mango varieties Amrapali, Sharmai Fazli, Neelambori, Indian Lota and Madrazi Tota. Mango fruits were collected from mango growers of Botiaghata Upazila, Khulna. The experiment was laid out in Completely Randomized Design (CRD) with three replications. Observations were made on different fruit characteristics, physical and chemical properties in three ripening stages viz. green, ripe and over ripe stage. The fruits of the varieties Amrapali, Sharmai Fazli, Neelambori, Indian Lota and Madrazi Tota weighed 189, 455, 180, 170 and 592 g, respectively. Maximum percentage of edible portion (78.53%), juice content (56.50-72.77%) and highest Total Soluble Solids (18.66%) were found in Madrazi Tota. Riped Madrazi Tota tastes very sweet in comparison to other varieties of mangoes under study. Indian Lota was higher in content of titratable acidity (0.04091%) and lowest in Neelambori (0.01866%).
 
 
 
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