Prof. Abubakar Abdulkarim

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Research Article Vol. 15, Issue 1

Advancements in Raw Material Availability, Development Strategies, and Industrial Prospects for Zinc-Carbon Dry Cell Production In Nigeria and Uganda

Excellence Favor, Abubakar Abdulkarim^*, Yinusa Ademola Adediran

Nigeria could boast of at least six functioning dry cell manufacturing industries. Unfortunately, today, these industries have gone into oblivion with only one trying, epileptically, to survive. One major factor responsible for this is the higher cost of production than the sales price of imported ready-made cells. This, in turn, is due to almost z...

Oct, 2026 Vol. 15, Issue 1 4 views 1 downloads

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Research Article Vol. 14, Issue 1

Optimized PID Based Load Frequency Control of a Hybrid Microgrid

S. M. Aminu^*, Y. Jibril, Abubakar Abdulkarim, A.S. Abubakar

This research presents the development of an optimized PID based load frequency control of a hybrid microgrid. The micro-grid (MG) concept allows the renewable energy sources to operate in both synchronized grid and islanded/stand-alone mode. These modes of operations of the MG have made it smart, hence require intelligent coordinated control strat...

DOI: 10.67203/zjeet.2025.n5uegmzb

Sep, 2025 Vol. 14, Issue 1 23 views 16 downloads

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Research Article Vol. 14, Issue 1

Derived Specific Rain Attenuation at Stand-Alone Milimeter Wave Bands for Samaru Zaria, Nigeria

I. Abdullahi^*, Abubakar Abdulkarim, U. Musa, I. A. Shehu, A. Aliyu

This work studies rain–induced effect on some envisaged 5G links located at Samaru Zaria, Kaduna State, Nigeria, operating at 26 GHz, 38 GHz and 42 GHz in a MATLAB environment; using 3–year rain data obtained from Em60G™ datalogger–powered metrological setup of the Nigerian Metrological Agency (NiMet) located at Ahmadu Bello University, Zaria. Lave...

DOI: 10.67203/zjeet.2025.oujsl7gb

Sep, 2025 Vol. 14, Issue 1 20 views 11 downloads

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Research Article Vol. 10, Issue 2

REVIEW ON METAHEURISTIC-BASED DECISION TREE INDUCTION

Ismaila Mahmud^*, Abubakar Abdulkarim, Sulaiman Haruna Sulaiman, Umar Musa

Decision tree is one of the well-known machine learning algorithms which remain popular due its simple implementation and ease of understanding. Existing techniques used in inducing decision tree have shown that they suffer data overfitting which leads to producing small size of decision tree model. To address the drawback and improve the performan...

DOI: 10.67203/zjeet.2021.iswe76kh

Sep, 2021 Vol. 10, Issue 2 19 views 8 downloads

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Research Article Vol. 9, Issue 2

INTERNAL MODEL CONTROL PERFORMANCE EVALUATION IN NONLINEAR COUPLED TANK SYSTEM

I. A. Shehu^*, M. Mohammed, Abubakar Abdulkarim, M. Auwal Shehu

Most industrial process control systems are associated with non-linearity behaviour.Control of such industrial process system is a challenging task according to the degree ofnon-linearity of the system. A typical process control that represent part of such complexindustrial process is the principle used in Coupled Tank System (CTS) level control. T...

DOI: 10.67203/zjeet.2020.dgltsq6u

Sep, 2020 Vol. 9, Issue 2 19 views 8 downloads

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Research Article Vol. 9, Issue 2

PERFORMANCE EVALUATION OF A THREE PHASE FIVE LEVEL MULTI-LEVEL INVERTER

I. S. Falulu^*, S. Moses Okpanachi, A. Abubakar, Abubakar Abdulkarim, Y. Jibril, S. A. Babale, A. Dahiru

A novel three-phase five-level H-NPC Inverter was proposed in this paper. Theproposed research involves developing a model of the inverter with number of powerswitches (IGBT) and four diodes per phase in order to achieve a three-phase five-level,output voltage waveform in a MATLAB/Simulink environment. The output line-to-linevoltage is improved and...

DOI: 10.67203/zjeet.2020.21404bh5

Sep, 2020 Vol. 9, Issue 2 15 views 11 downloads

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Research Article Vol. 8, Issue 2

MODULAR MULTILEVEL CONVERTER WITH HARMONICS COMPENSATION FOR STATE-FEEDBACK CONTROLLER

A. U,Lawan^*, Abubakar Abdulkarim, I.S Madugu, Abdullahi Bala Kunya, G.S. Shehu

The voltage variations among the sub-module (SM) capacitors result in harmonicssuperimposed unto the circulating current. The conventional control of the SM voltages usesa closed-loop proportional Integral (PI) controller based on carrier shifted pulse widthmodulation (CSPWM). The PI-controller provides a dc reference circulating current for thecon...

DOI: 10.67203/zjeet.2019.bpk45vih

Sep, 2019 Vol. 8, Issue 2 16 views 13 downloads

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Research Article Vol. 8, Issue 2

MODULAR MULTILEVEL CONVERTER WITH STATEFEEDBACK CONTROLLER FOR HARMONICS SUPPRESSION

A. U,Lawan^*, Abubakar Abdulkarim, G.S. Shehu, A. Kunya, I.S Madugu

Control of submodule capacitor voltages and the circulating current within modularmultilevel converter (MMC) is essential to MMC performance. The circulating current hasan influence on the losses, rating of the power devices and voltage ripple. The circulatingcurrent tends to have csurrent harmonics due to the voltage disturbance on the submoduleca...

DOI: 10.67203/zjeet.2019.wd9dds7y

Sep, 2019 Vol. 8, Issue 2 14 views 6 downloads

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Publications 8