Browsing by Author "Rayhan, Md. Shamim"

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    DISSEMINATING THE BIOMEDICAL WASTE GENERATION SCENARIO DURING COVID-19
    (AMERICAN INTERNATIONAL JOURNAL OF NURSING EDUCATION AND PRACTICE, 2021) Muhib, Md. Iftakharul; Akter, Rifat; Kabir, Md. Humaun; Rayhan, Md. Shamim; Khan, Md. Shawkut Ali
    This study investigates the present COVID-19-related medical waste generation scenario and suggests a way forward from the perspective of lower-middle-income countries like Bangladesh. Bangladesh is a densely populated vulnerable country in the perspective of the COVID-19 induced biomedical waste management field. The pandemic COVID-19 has already created enormous instability in healthcare waste handling and subsequent recycling around the world. The medical waste management sector in Bangladesh is struggling and COVID-19 makes the situation even more complicated. A rigorous timeseries calculation was done to determine the facemask and medical waste load during COVID-19 in Bangladesh from March 8, 2020, to September 13, 2021 period. Results showed that about 1,58,10,400 pieces of facemask are disposed of alone in different urban areas which is equivalent to 517 tons of solid waste while extra 5,203 tons of biomedical waste is added every day to regular waste streams during this pandemic. The findings of this study suggest that these extra tons of hazardous waste threaten the aquaculture of the country and promote the risk of contagious diseases to the waste workers especially women and as well as at the community level. The findings also reveal that this pandemic has already created a hindrance to achieving the country’s SDGs by 2020.
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    Investigation To Reduce Drag of a Noah 2020 Car by Using Contour Bump
    (Eighth Sense Research Group, 2023-06-01) Al Hasan, Abdullah; Rayhan, Md. Shamim
    NOAH car is a four wheeler minivan or passenger car which is a popular means of transportation in Bangladesh due to its comfortability, provision to go anywhere like for any occasion, family program and official use. But the aerodynamic drag has a great contribution on its energy and fuel consumption which is 0.4001 for the base model. In our investigation we used ANSYS Fluent software with CFD simulations for add-on devices. We used contour bump on the rear roof of the existing model without changing its external and internal design. The 3D designs of solid model are taken into account for the simulation of flow visualization around the car. Coefficient of drag CD was found numerically for all the models where we got 0.3859 for using one bump which reduce the drag by 3.5% and the maximum reduction was 0.3843 by 3.95% for two bumps configuration. Other six configurations are also effective but less efficient than the two proposed model of one and two bump configurations. Also the fuel consumption was reduced by maximum of 2.37% for two bump and 2.1% for one bump configuration. Also we have got an effective result for stream wise configuration of two bumps where we got maximum drag reduction of 3.85% which reduce the fuel consumption by 2.31%.