Browsing by Author "Abul Kashem, Md."

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Cadmium Phytoextraction Efficiency of Arum (Colocasia antiquorum), Radish (Raphanus sativus L.) and Water Spinach (Ipomoea aquatica) Grown in Hydroponics
(Water Air Soil Pollut, 2008) Abul Kashem, Md.; Singh, Bal Ram; Huq, S. M. Imamul; Kawai, Shigenao
Selection of a phytoextraction plant with high Cd accumulation potential based on compatibility with mechanized cultivation practice and local environmental conditions may provide more benefits than selection based mainly on high Cd tolerance plants. In this hydroponics study, the potential of Cd accumulation by three plant species; arum (Colocasia antiquorum), radish (Raphanus sativus L.) and water spinach (Ipomoea aquatica) were investigated. Arum (Colocasia antiquorum L.) plants were grown for 60 days in a nutrient solution with 0, 10 or 50 μM Cd, while radish and water spinach plants grew only 12 days in 0, 1.5, 2.5, 5 or 10 μM Cd. Growth of radish and water spinach plants decreased under all Cd treatments (1.5 to 10 μM), while arum growth decreased only at 50 μM Cd. At 10 μM Cd treatment, the growth of arum was similar to the control treatment indicating higher tolerance of arum for Cd than radish and water spinach. Cadmium concentrations in different plant parts of all plant species increased significantly with Cd application in the nutrient solution. Arum and water spinach retained greater proportions of Cd in their roots, while in radish, Cd concentration in leaves was higher than in other plant parts. Cadmium concentrations in arum increased from 158 to 1,060 in the dead leaves, 37 to 280 in the normal leaves, 108 to 715 in the stems, 42 to 290 in the bulbs and 1,195 to 3,840 mg kg−1 in the roots, when the Cd level in the solution was raised from 10 μM Cd to 50 μM Cd. Arum accumulated (dry weight×concentration) 25 mg plant−1 at 10 μM, while the corresponding values for radish and water spinach were 0.23 and 0.44 mg plant−1, respectively. With no growth retardation at Cd concentrations as high as 166 mg kg−1 measured in entire plant (including root) of arum at 10 μM Cd in the nutrient solution, arum could be a potential Cd accumulator plant species and could be used for phytoremediation.
Design and analysis of a mini grid PV system for off grid rural areas of Bangladesh
(Department of Electrical and Electronic Engineering, 2007-05) Abul Kashem, Md.; Shahidul Islam Khan, Dr.
Bangladesh is a developing country with large population of more than 125 million in a total area of 147570 km2 and her energy consumption per capita is extremely low compare to neighboring countries. Only 32% of the total population having access to the grid electricity clearly indicates the acute shortage of electrical power in Bangladesh. The scenario is far worse in rural areas. After sunset the entire rural Bangladesh plunge into darkness. Photovo1taic (PV) systems, which convert light energy into electricity are a perfect fit in these conditions. PV systems fall into two basic categories: stand-alone and grid .connected. Stand-alone PV systems are designed to operate independently of the electric utility grid, and are generally designed and sized to supply certain DC and/or AC electrical loads. Photovoltaic systems that are connected to the utility grid called utility-connected or grid-tie, or line-tie systems. The objective of the project is to design and analyze a 10kWp PV mini grid (stand alone) system for off grid rural areas of Bangladesh using RETScreen software. Such an analysis will be useful for planning any mini- PV grid in rural areas of Bangladesh.
Review of non-tidal scale model studies in Bangladesh
(Department of Water Resources Engineering, 1988-05) Abul Kashem, Md.; Hossain, Dr. M. Monowar
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