Jahirul Islam | National University Of Bangladesh (original) (raw)
Government Of the people's Republic of Bangladesh
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Papers by Jahirul Islam
Horticulturae, Mar 7, 2024
Journal of Naval Architecture and Marine Engineering, 1970
Child Abuse & Neglect, Dec 1, 2018
Transactions on Electrical and Electronic Materials, Mar 9, 2021
This study reports the strain-dependent efficiency of the InGaN-based multi-junction solar cell (... more This study reports the strain-dependent efficiency of the InGaN-based multi-junction solar cell (MJSC) for the first time. The route of strain in MJSC is identified to be the results of dissimilar lattice constants between layers of sub-cell grown epitaxially with bandgap stepping. Utilising multi-layered strain model, the state of strain and its magnitude is evaluated for three types of MJSC structures referred to as MJSC-1, MJSC-2, and MJSC-3. It is found that the MJSC position-dependent strain is strongly dependent on the sub-cell thickness as well as on the number of sub-cells. Employing the MJSC position-dependent strain in combination with deformation potentials, strain-induced energy bandgap is calculated when imposed under tensile strain condition. Finally, the strain-dependent efficiencies of different MJSC structures are estimated and obtained to be lower with that of reported with strain effects over sighted. The loss of efficiency is identified to be due to the open circuit voltage which decreases under tensile strain condition. Among the MJSC structures studied here, MJSC-3 with 7-layers is less efficient and its efficiency decreases up to 3.01% when strain effect is taken into consideration.
International journal of physical research, Feb 20, 2022
Bangladesh Journal of Scientific and Industrial Research, 1970
Advances in Alzheimer's disease, 2015
A solar tracking system is designed for the orientation of different solar energy receivers, phot... more A solar tracking system is designed for the orientation of different solar energy receivers, photovoltaic arrays or thermal receivers to maximize the operation of solar energy conversion. This paper deals with the design and implementation of a multi-directional solar tracking system dedicated to use with PV panels. The proposed solar tracking device ensures the maximization of the conversion of solar energy into electricity by properly orienting the PV panel in accordance with the real position of the sun. The dual axis solar tracker moves only in vertical direction with Y and Z-axis movement. It cannot move in horizontal direction with X-axis movement. Our proposed model can move in vertical position with Y-axis movement and in horizontal position with X-axis movement and also move at a point in Z-axis making combination of X and Y-axis movement. The gain of output power with the Multi-directional tracking system is higher when compared with a dual axis tracker. The performance of the proposed solar tracker was experimentally analyzed.
Journal of Interpersonal Violence, Sep 7, 2017
Dhaka Shishu, Children, Hospital journal, Oct 12, 2020
Bangladesh heart journal, Jun 20, 2022
In this paper, an IoT-based water quality monitoring and control system is proposed, which analyz... more In this paper, an IoT-based water quality monitoring and control system is proposed, which analyzes water quality and quantity while also cleaning unclean water. The system captures water data using various water sensors and sends it via the Internet to remote servers. It automatically opens the water pump based on the volume of water, and if the water purity value goes below a specified threshold, it notifies the owner, cleans the water tank, and disposes of the dirty water. The major purpose of this system is to verify whether the water is dirty using real-time water data analysis and to clean the water tank by draining the dirty water. Several water data from 750 samples were collected and processed then data were plotted to visualize the correlation among those water parameters. Also, the performance of this project is evaluated and 93% accuracy is found based on the capability of finding actual water quality.
Due to its economic superiority and modest output performance, organic photovoltaic (OPV) has ach... more Due to its economic superiority and modest output performance, organic photovoltaic (OPV) has achieved amazing development in solar power generation over the previous few decades. By integrating different intermediate layers, the efficiency of a traditional OPV cell can be greatly boosted. In this paper, GPVDM software is used to analyze the electrical and optical performances of single junction OPV cell with organic and oxide interlayers under AM 1.5 illumination. Extensive investigation of the simulated results reveals that when an oxide layer such as ZnO is inserted as a hole transport layer above the active layer, the power conversion efficiency (PCE) becomes 4.74 %, whereas the PCE of a PEDOT:PSS interlayer based OPV cell is 4.28 %. Additionally, the short circuit current density of an OPV cell having ZnO interlayer has been found to be 11.96 A/cm2. This shows 10% improvement in efficiency compared to when PEDOT:PSS is used as the interlayer. This information will be helpful in choosing appropriate interlayers for OPV cells.
Transactions on Electrical and Electronic Materials, Dec 8, 2021
Studies in Autonomic, Data-driven and Industrial Computing, 2023
Horticulturae, Mar 7, 2024
Journal of Naval Architecture and Marine Engineering, 1970
Child Abuse & Neglect, Dec 1, 2018
Transactions on Electrical and Electronic Materials, Mar 9, 2021
This study reports the strain-dependent efficiency of the InGaN-based multi-junction solar cell (... more This study reports the strain-dependent efficiency of the InGaN-based multi-junction solar cell (MJSC) for the first time. The route of strain in MJSC is identified to be the results of dissimilar lattice constants between layers of sub-cell grown epitaxially with bandgap stepping. Utilising multi-layered strain model, the state of strain and its magnitude is evaluated for three types of MJSC structures referred to as MJSC-1, MJSC-2, and MJSC-3. It is found that the MJSC position-dependent strain is strongly dependent on the sub-cell thickness as well as on the number of sub-cells. Employing the MJSC position-dependent strain in combination with deformation potentials, strain-induced energy bandgap is calculated when imposed under tensile strain condition. Finally, the strain-dependent efficiencies of different MJSC structures are estimated and obtained to be lower with that of reported with strain effects over sighted. The loss of efficiency is identified to be due to the open circuit voltage which decreases under tensile strain condition. Among the MJSC structures studied here, MJSC-3 with 7-layers is less efficient and its efficiency decreases up to 3.01% when strain effect is taken into consideration.
International journal of physical research, Feb 20, 2022
Bangladesh Journal of Scientific and Industrial Research, 1970
Advances in Alzheimer's disease, 2015
A solar tracking system is designed for the orientation of different solar energy receivers, phot... more A solar tracking system is designed for the orientation of different solar energy receivers, photovoltaic arrays or thermal receivers to maximize the operation of solar energy conversion. This paper deals with the design and implementation of a multi-directional solar tracking system dedicated to use with PV panels. The proposed solar tracking device ensures the maximization of the conversion of solar energy into electricity by properly orienting the PV panel in accordance with the real position of the sun. The dual axis solar tracker moves only in vertical direction with Y and Z-axis movement. It cannot move in horizontal direction with X-axis movement. Our proposed model can move in vertical position with Y-axis movement and in horizontal position with X-axis movement and also move at a point in Z-axis making combination of X and Y-axis movement. The gain of output power with the Multi-directional tracking system is higher when compared with a dual axis tracker. The performance of the proposed solar tracker was experimentally analyzed.
Journal of Interpersonal Violence, Sep 7, 2017
Dhaka Shishu, Children, Hospital journal, Oct 12, 2020
Bangladesh heart journal, Jun 20, 2022
In this paper, an IoT-based water quality monitoring and control system is proposed, which analyz... more In this paper, an IoT-based water quality monitoring and control system is proposed, which analyzes water quality and quantity while also cleaning unclean water. The system captures water data using various water sensors and sends it via the Internet to remote servers. It automatically opens the water pump based on the volume of water, and if the water purity value goes below a specified threshold, it notifies the owner, cleans the water tank, and disposes of the dirty water. The major purpose of this system is to verify whether the water is dirty using real-time water data analysis and to clean the water tank by draining the dirty water. Several water data from 750 samples were collected and processed then data were plotted to visualize the correlation among those water parameters. Also, the performance of this project is evaluated and 93% accuracy is found based on the capability of finding actual water quality.
Due to its economic superiority and modest output performance, organic photovoltaic (OPV) has ach... more Due to its economic superiority and modest output performance, organic photovoltaic (OPV) has achieved amazing development in solar power generation over the previous few decades. By integrating different intermediate layers, the efficiency of a traditional OPV cell can be greatly boosted. In this paper, GPVDM software is used to analyze the electrical and optical performances of single junction OPV cell with organic and oxide interlayers under AM 1.5 illumination. Extensive investigation of the simulated results reveals that when an oxide layer such as ZnO is inserted as a hole transport layer above the active layer, the power conversion efficiency (PCE) becomes 4.74 %, whereas the PCE of a PEDOT:PSS interlayer based OPV cell is 4.28 %. Additionally, the short circuit current density of an OPV cell having ZnO interlayer has been found to be 11.96 A/cm2. This shows 10% improvement in efficiency compared to when PEDOT:PSS is used as the interlayer. This information will be helpful in choosing appropriate interlayers for OPV cells.
Transactions on Electrical and Electronic Materials, Dec 8, 2021
Studies in Autonomic, Data-driven and Industrial Computing, 2023