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All Journal Jurnal Ilmiah Teknik Elektro Komputer dan Informatika (JITEKI) Biology, Medicine, & Natural Product Chemistry
Ibrahim, Salihu
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Biochemistry, Genetics & Molecular Biology Computer Science & IT Electrical & Electronics Engineering Medicine & Pharmacology Public Health

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Harmonic Mitigation in Inverter Circuits Through Innovative LC Filter Design Using PSIM Usman, Habib Muhammad; Mahmud, Muhammad; Saminu, Sani; Ibrahim, Salihu
Jurnal Ilmiah Teknik Elektro Komputer dan Informatika Vol. 10 No. 1 (2024): March
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/jiteki.v10i1.28398

Abstract

The increasing use of renewable energy sources, such as solar and wind power, and the growing ubiquity of High Voltage Direct Current (HVDC) transmission systems to improve power transmission efficiency are the main factors behind the increased deployment of inverter circuits. However, high harmonic distortions in the resultant sine wave are a major problem for inverter circuits and could jeopardise circuit efficiency if left unchecked. This study presents a novel, affordable, and effective LC filter intended to remove almost all harmonic content from inverter circuits. The study uses PSIM software to model, design, and control a three-phase inverter. Starting with the DC power supply, the study makes use of effective three-legged IGBT (insulated gate bipolar transistor) semiconductor devices as switch elements due to their high and current rating as well as faster operation. The switching gate pulses that turn inverter switches on and off at regular 60-degree intervals are produced by the pulse controller that controls the switches. This study's results show that the innovative LC filter in the inverter significantly reduced total harmonic distortion (THD) in all phases of the power signal. Specifically, THD decreased from 37.68% to 0.47% in the red phase, from 37.69% to 0.48% in the blue phase, and from 37.71% to 0.48% in the yellow phase. This reduction results in a notable improvement in power quality in all phases of the signal. Additionally, there is a noticeable increase in voltage magnitude, stabilizing and raising levels from 17.92 V to 23.83 V in the red phase, 17.93 V to 23.81 V in the blue phase, and 17.83 V to 23.81 V in the yellow phase due to the LC filter. These results demonstrated the effectiveness of the LC filter-equipped inverter for industrial, HVDC, and renewable energy applications.
Isolation, Characterization and Growth Optimization of Glufosunate Ammonium Degrading Bacteria from Farmlands Soil in Mubi Yakubu, Kabiru; Ibrahim, Salihu; Bello, Ahmad Umar; Babandi, Abba
Biology, Medicine, & Natural Product Chemistry Vol 14, No 2 (2025)
Publisher : Sunan Kalijaga State Islamic University & Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14421/biomedich.2025.142.1509-1527

Abstract

The persistent application of glufosinate ammonium as a non-selective herbicide in agricultural practices raises significant environmental concerns due to its potential accumulation and eco-toxicity. This study focused on the isolation, characterization, degradation and optimization of glufosinate ammonium degrading bacteria from agricultural soil in Mubi, Adamawa State, Nigeria. Three isolates were screened from mineral salt medium containing glufosinate ammonium herbicides as carbon source which are isolate GA1, GA2 and GA3 but the isolate GA3 strain show highest degradation potential of glufosinate ammonium compare to GA1 and GA2 which was  determined by UV-spectrophotometer and further by LC-MS which showed degradation by 75.9%  the GA3 strain was characterized morphologically and biochemically as gram positive, and through 16SrRNA gene sequencing and phylogenetic analysis confirmed isolate GA3 (94.45% 16SrRNA homology to Bacillus ). Optimization of the degradation condition was performed using the one factor at a time (OFAT) approach, which revealed that the strain has growth optima at 35oC, pH 7.0, 10 mg/L glufosinate ammonium, with 5% inoculum size, and 48 hours’ incubation peak growth, the GA3 stain had growth stimulated best with glutamic acid 1g/L, (nitrogen source), and sucrose 1g/L (carbon source), exposure to heavy metal revealed Zn,Cu, and Fe stimulate growth whereas Pb and Hg caused significant inhibition. (p<0.0001, ANOVA). Response surface methodology (RSM) optimization enhanced degradation efficiency with GA3 strain degrading 75.9% glufosinate ammonium, the model shows great fit to the quadratic model (R2=0.9552) for GA3strain (F=23.66., P<0.0001). The results revealed that GA3 strain is capable of significant glufosinate ammonium degradation, with optimized conditions enhancing degradation efficiency. This study revealed great potential of indigenous soil microbes in bioremediation of herbicides-contaminated environments and provide a foundation for the development of eco-friendly strategies to mitigate glufosinate pollution in agricultural systems.
Co-Authors Babandi, Abba Bello, Ahmad Umar Muhammad Mahmud Saminu, Sani Usman, Habib Muhammad Yakubu, Kabiru