Browsing by Author "Md. Abdullah Al Mahmud"

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Electrical model of a solar car system using SIMULINK
(BRAC University, 2014-12) Md. Abdullah Al Mahmud; Md. Asifuzzaman; Samadani, Md. Adnan; Alam, B.M. Asif Khurshed
A feasible alternative source of renewable energy is solar power technology. Considering the crucial hindrances in developing and implementing the system solar powered car, the necessity of a simulation tools comes in front. For this reason a simulation tool having the options to model and analyze the characteristics of different electronic and mechanical components i.e. a solar panel, a battery and a DC motor should have been developed. Moreover, it is capable of combining different components with control algorithms to examine and evaluate the performance of the whole system in different ambient conditions. In this paper, the demonstration to develop a dynamic model of a solar car in SIMULINK is explained including the approaches to develop the model of different components from scratch and how to use it to test and verify the behavior of them. SIMULINK is a graphical programing language tool for modeling and simulation highly integrated with MATLAB which makes the mathematical operations and plotting the graphs easiest ever. The dynamicity of the model offers the user to change the parameters of every components and environment to fit their purpose. The scope of the article extends to combination of all components of the solar car to test overall system at diverse car velocity for any single day of the year.
Potential for green mussel (Perna viridis) Culture in the Naf River of Bangladesh
(Chattogram Veterinary & Animal Sciences University, 2019-06) Md. Abdullah Al Mahmud
Green mussel (Perna viridis) is an important source of affordable animal protein for coastal communities. The suitability of the environment influence the success and sustainability of this green mussel culture technic. The study was carried out to evaluate the possible aspect to culture Perna viridis in Naf River, Teknaf, Cox’s Bazar. In this study, site suitability of Naf River for green mussel farming was evaluate based on the month wise variations of physico-chemical water quality parameters, and as well as the quantitative and qualitative abundance of plankton community from March 2018 to September 2018. Five stations were selected chronologically from downstream to upstream maintaining specific interval. The result showed that most of the water quality parameters were considered as suitable for green mussel culture. Salinity was fluctuated from 8 to 30 ppt during this period which was the major issue for green mussel culture. In Naf River, a total number of 29 genera of phytoplankton and 11 genera of zooplankton were identified, and their abundance varied from 12.27×103 to 126.67×103 cells/L depending on the months and stations. The class Bacillariophyceae dominated among the phytoplankton community with 62.05% of the total plankton count. After analyzing all the water quality parameter, qualitative and quantitative abundance of plankton, the selected stations exhibited site suitability for green mussel culture. In conclusion, the stations of Naf River are capable and moderately suitable for green mussel culture. This research will help to take initiative on proper management strategy to evaluate the aspect of P. viridis culture and guide the future research as baseline studies in this aspect.