Institution
Chittagong University of Engineering & Technology
Education•Chittagong, Bangladesh•
About: Chittagong University of Engineering & Technology is a education organization based out in Chittagong, Bangladesh. It is known for research contribution in the topics: Renewable energy & Dielectric. The organization has 1200 authors who have published 1444 publications receiving 10418 citations. The organization is also known as: Engineering College, Chittagong & Bangladesh Institute of Technology, Chittagong.
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28 Jan 2021
TL;DR: In this article, the results of optoelectronic, thermodynamic and vibrational properties of intermetallic MgAl2Ge2 via density functional theory-based investigations were revealed.
Abstract: Intermetallic compounds with CaAl2Si2-type structure have been studied extensively due to their exciting set of physical properties. Among various alumo-germanides, MgAl2Ge2 is the new representative of CaAl2Si2-type structures. Our previous study explores the structural aspects, mechanical behaviors and electronic features of intermetallic MgAl2Ge2. The present work discloses the results of optoelectronic, thermodynamic and vibrational properties of MgAl2Ge2 via density functional theory-based investigations. The band structure calculations suggest that MgAl2Ge2 possesses slight electronic anisotropy and the compound is metallic. The Fermi surface topology reveals that both electron- and hole-like sheets are present in MgAl2Ge2. The electron charge density map indicates toward the dominance of covalent bonding in MgAl2Ge2. The optical parameters are found to be independent of the state of the polarization of incident electric field. The large value of the reflectivity in the visible-to-ultraviolet region up to ~ 15 eV suggests that MgAl2Ge2 might be a good candidate as coating material to avoid solar heating. The thermodynamic properties have been calculated using the quasi-harmonic Debye approximation. We have found indications of lattice instability at the Brillouin zone boundary in the trigonal $$P\overline{3}m1$$
phase from the phonon dispersion curves. However, the compound might be stable at elevated temperature and as a function of pressure. All the theoretical findings herein have been compared with the reported results (where available). Various implications of our results have been discussed in detail.
2 citations
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15 Feb 2020TL;DR: Optimization has been done in the Crossover and Mutation process which has reduced the number of iterations for solving the quadratic equation and reaches towards the goal efficiently.
Abstract: Solving quadratic equation efficiently is a real-world challenge nowadays, due to its wide applications in the task of determining a product’s profit, calculating areas or formulating the speed of an object. The general approach of finding the roots of a quadratic equation is not enough efficient due to the requirement of high computation time. Because of the Genetic Algorithm’s stochastic characteristics and efficiency in solving problems it can be used to find roots of quadratic equation precisely. In modern athletics reducing the computation time of solving the quadratic equation has been so inevitable where using a genetic algorithm can find a quick solution that doesn’t violate any of the constraints and with high precision also. Optimization has been done in the Crossover and Mutation process which has reduced the number of iterations for solving the equation. It reduces the time complexity of the existing approach of solving the quadratic equation and reaches towards the goal efficiently.
2 citations
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TL;DR: In this paper, the synthesis of Zn x Cd 1-x S (x=0 to 0.41) thin-films on soda-lime glass substrates by chemical bath deposition technique and the as-grown Zn 31 Cd 0.59 S films are annealed at 200 o C, 350 o C and 500 o C in the N 2 ambient for 20 minutes.
Abstract: We report the synthesis of Zn x Cd 1-x S (x=0 to 0.41) thin-films on soda-lime glass substrates by chemical bath deposition technique and the as-grown Zn 31 Cd 0.59 S films are annealed at 200 o C, 350 o C, and 500 o C in the N 2 ambient for 20 minutes. The structural properties, optical properties, surface morphology and elemental composition of the films are characterized by XRD, UV-Vis N.I.R. spectroscopy, EDX., and FESEM. The thickness of the as-grown films is measured by the DEKTAK stylus profilometer and is in the range of â“100 nm-120 nm. The as-grown films show quasi-crystalline nature with preferential orientation along (002) hexagonal plane and the crystallinity is declined with the increment of zinc content. Also, the FESEM micrographs show the homogeneous growth, pinhole-free surface, and compactness of the films. The transmission edge is shifted towards the short wavelength region as the relative zinc content in the as-grown films increases, which confirms the significant reduction of photon absorption in the blue region of the solar spectrum. The as-grown films show average transmittance of â“80-90% along with a tunable bandgap of 2.50eV to 3.35eV for the variation of relative zinc content from 0 to 0.41. The annealing treatment improves the crystalline properties of Zn 31 Cd 0.69 S film and the best crystallinity is obtained at 350 o C temperature. Meanwhile, the annealed Zn 31 Cd 0.69 S films also exhibit a variable bandgap of 2.85eV, 3.10eV and, 3.22eV at 200 o C, 350 o C, and 500 o C respectively whereas the bandgap of the as-grown film is 3.12eV. Annealed Zn 31 Cd 0.69 S thin-film at 350 o C having enhanced structural properties without affecting optical characteristics and therefore it can be suitable as a good alternative buffer layer for thin-film solar cell applications.
2 citations
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01 Oct 2016
TL;DR: In this article, the effect of zirconia content on hardness and elastic modulus were examined, and flexural strength shown an increasing trend with the rise of ZIRconia contents.
Abstract: Employing slurry method, 20 wt % of ZrO 2 has been prepared by incorporating high purity nanocrystalline a-alumina powder and sintered at 1600°C for two hours. XRD pattern confirmed the existence of m and t phase of 20 wt % of ZrO 2 compared to pure alumina. The theoretical and bulk density increases with the doping of zirconia, whereas porosity declines with the similar change of zirconia. By using SEM, the surface morphology of the samples has been studied. The effect of zirconia content on hardness and elastic modulus were examined. Maximum hardness and elastic modulus has been observed for pure alumina. Moreover, flexural strength shown increasing trend with the rise of zirconia content. An alternative design of Al 2 O 3 -ZrO 2 composites can be employed for improved structural and mechanical properties for biomedical application rather than using pure alumina at 1600°C.
2 citations
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TL;DR: The present work attempts to estimate the percentage of affected groundnut leaves area across four regions of Andharapradesh using image processing techniques, and recommends to spray the pesticides on the affected regions alone across the field to improve the plant growth and thereby yield will be increased.
Abstract: Identification, classification, and quantification of crop defects are of paramount interest to the farmers for preventive measures and decrease the yield loss through necessary remedial actions Due to the vast agricultural field, manual inspection of crops is tedious and time-consuming UAV based data collection, observation, identification, and quantification of defected leaves area are considered to be an effective solution The present work attempts to estimate the percentage of affected groundnut leaves area across five regions of Andhra Pradesh using image processing techniques The proposed method involves color space transformation combined with a thresholding technique to perform the segmentation The calibration measures are performed during acquisition with respect to UAV capturing distance, angle, and other relevant camera parameters Finally, our method can estimate the consolidated leaves and defected area The image analysis results across these five regions reveal that around 14–28% of leaves area is affected across the groundnut field, and thereby yield will be diminished correspondingly Hence, it is recommended to spray the pesticides on the areas affected alone across the field to improve the plant growth and thereby yield will be increased
2 citations
Authors
Showing all 1219 results
Name | H-index | Papers | Citations |
---|---|---|---|
Mohammad Rashed Iqbal Faruque | 29 | 288 | 2969 |
Ashraf Uz Zaman | 28 | 147 | 2704 |
Nusrat Jahan | 26 | 173 | 2127 |
M.M.K. Bhuiya | 22 | 45 | 1925 |
Iqbal H. Sarker | 20 | 100 | 1100 |
M. A. Ali | 20 | 87 | 1155 |
Scott Arthur | 19 | 106 | 1963 |
Mohammed Nazrul Islam | 17 | 124 | 905 |
M. G. Hafez | 16 | 60 | 735 |
Mohammad Mahbubur Rahman | 16 | 44 | 779 |
Khizir Mahmud | 15 | 54 | 851 |
Mohammad Alamgir Hossain | 15 | 62 | 638 |
J. U. Ahamed | 15 | 47 | 1151 |
Md. Mukter Hossain | 14 | 46 | 593 |
Kaushik Deb | 14 | 97 | 833 |