Browsing by Author "Rahman, Md Azizur"

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Decoding the mystery of Bangladesh's jute decline: A climate crisis or plastic predicament
(Scopus, 2024-12) Anam, Sayedul; Rahman, Md Azizur; Hassan, Md Arif
Bangladesh is one of the areas in Asia most vulnerable to climate change, with a mostly agricultural economy. Although jute was formerly an important cash crop, its production has steadily declined. However, the use of plastic products instead of jute-made goods is increasing rapidly. This study investigates whether plastic and climate change seriously threaten jute crops in Bangladesh. The dataset includes observations from 1988 to 2021, and various methods are used, including the Augmented Dickey-Fuller (ADF) test, Johansen cointegrating regression estimators, and fully modified Autoregressive Distributed Lag (ARDL). The findings show that floods and rainfall significantly harm jute production in Bangladesh. However, plastic usage which is measured by the use of plastic has no statistically significant effects on jute production. Therefore, to safeguard jute production in Bangladesh, the government should prioritize climate-resilient agricultural practices, such as improved flood management and the introduction of flood-resistant jute varieties. Additionally, promoting jute-made products over plastic alternatives can help revive the jute industry and reduce plastic pollution.
Numerical modeling of a MHD non-linear radiative Maxwell nano fluid with activation energy
(2024-01-30) Ahmed, Fariha; Reza-E-Rabbi, Sk; Yousuf Ali, Md; Ershad Ali, Lasker; Islam, Ariful; Rahman, Md Azizur; Roy, Raju; Rafiqul Islam, Md; Ahmmed, Sarder Firoz
The present research explores linear as well as nonlinear radiation patterns based on the MHD non-Newtonian (Maxwell) nanofluid flow having Arrhenius activation energy. This study's core focus is MHD properties in non-Newtonian fluid dynamics and boundary layer phenomena analysis. It initiates with time-dependent equations, employing boundary layer approximations. Extensive numerical computations, executed with custom Compact Visual Fortran code and the EFD method, provide profound insights into non-Newtonian fluid behavior, revealing intricate force interactions and fluid patterns. To check the stability of the solution, a convergence and stability analysis is performed. With the values of ΔY = 0.25, Δτ = 0.0005, and ΔX = 0.20; it is found that the model convergence occurs to the Lewis number, Le > 0.016 as well as the Prandtl number, Pr > 0.08. In this context, investigating non-dimensional results that depend on multiple physical factors. Explanation and visual representations of the effects of different physical characteristics and their resultant temperatures, concentrations, and velocity profiles are provided. As a result of the illustrations, the skin friction coefficient and Sherwood number, which are calculated, as well as Nusselt values, have all come up in discussion. Additionally, detailed representations of isothermal lines and streamlines are implemented, and it is pointed out that the development of these features occurs at the same time as Brownian motion. Furthermore, the temperature field for Maxwell fluid is modified due to the impression of chemical reaction as well as the Dufour number (Kr and Du). Our research demonstrates the superior performance of non-Newtonian solutions, notably in cases involving activation energy and nonlinear radiation. This paradigm shift carries significant implications. In another context, the interplay between Maxwell fluid and nonlinear radiation is notably affected by activation energy, offering promising applications in fields like medicine and industry, particularly in groundbreaking cancer treatment approaches.
Numerical modeling of a MHD non-linear radiative Maxwell nano fluid with activation energy
(2024-01-30) Ahmed, Fariha; Reza-E-Rabbi, Sk; Yousuf Ali, Md; Ershad Ali, Lasker; Islam, Ariful; Rahman, Md Azizur; Roy, Raju; Islam, Md Rafiqul; Ahmmed, Sarder Firoz
The present research explores linear as well as nonlinear radiation patterns based on the MHD non-Newtonian (Maxwell) nanofluid flow having Arrhenius activation energy. This study's core focus is MHD properties in non-Newtonian fluid dynamics and boundary layer phenomena analysis. It initiates with time-dependent equations, employing boundary layer approximations. Extensive numerical computations, executed with custom Compact Visual Fortran code and the EFD method, provide profound insights into non-Newtonian fluid behavior, revealing intricate force interactions and fluid patterns. To check the stability of the solution, a convergence and stability analysis is performed. With the values of ΔY = 0.25, Δτ = 0.0005, and ΔX = 0.20; it is found that the model convergence occurs to the Lewis number, Le > 0.016 as well as the Prandtl number, Pr > 0.08. In this context, investigating non-dimensional results that depend on multiple physical factors. Explanation and visual representations of the effects of different physical characteristics and their resultant temperatures, concentrations, and velocity profiles are provided. As a result of the illustrations, the skin friction coefficient and Sherwood number, which are calculated, as well as Nusselt values, have all come up in discussion. Additionally, detailed representations of isothermal lines and streamlines are implemented, and it is pointed out that the development of these features occurs at the same time as Brownian motion. Furthermore, the temperature field for Maxwell fluid is modified due to the impression of chemical reaction as well as the Dufour number (Kr and Du). Our research demonstrates the superior performance of non-Newtonian solutions, notably in cases involving activation energy and nonlinear radiation. This paradigm shift carries significant implications. In another context, the interplay between Maxwell fluid and nonlinear radiation is notably affected by activation energy, offering promising applications in fields like medicine and industry, particularly in groundbreaking cancer treatment approaches.