160 results on '"Yusuf, Abubakar"'
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2. High-Efficiency NO conversion via In-Situ grown covalent organic framework on g-C3N4 nanosheets with Single-Atom platinum photocatalyst
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Xiao, Zhiyu, Yusuf, Abubakar, Ren, Yong, Zheng Chen, George, Wang, Chengjun, and He, Jun
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- 2024
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3. Wind farm layout optimisation considering commercial wind turbines using parallel reference points, radial space division and reference vector guided EA-based approach
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Houssem Rafik El-Hana Bouchekara, Yusuf Abubakar Sha’aban, Mohammad Shoaib Shahriar, Makbul Anwari Muhammad Ramli, and Abdullahi Abubakar Mas’ud
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Real wind turbine ,Wind farm layout ,EA multiobjective optimisation ,Maximum efficiency ,Maximum power ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
In this study, a new multiobjective optimisation-based approach for Wind Farm Layout Optimisation (WFLO) is developed. The proposed approach combines four distinct Evolutionary algorithms (EA) based on multiobjective optimisation methods into a more powerful parallel method. The four combined algorithms are: the Radial Space Division based EA (RSEA), the Reference Points based EA (RPEA), RVEA embedded with the reference vector regeneration strategy (RVEAa) and the Reference Vector Guided EA (RVEA). The proposed approach is PRPSVEAa, where the letter P stands for parallel, and the remaining letters are used from different combined methods. In this research, four case studies have been investigated using four different commercial wind turbines where the hub heights of Wind Turbines (WT) are kept the same in some cases and varied in some. The results indicate that the Pareto set of solutions varies from each other with different numbers of WT as they spread over a wide region. This offers the designer the most suitable layout solution based on technical and economic factors. The obtained result can also be used to plan for future extensions of the research work.
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- 2023
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4. SCAPS-1D simulated organometallic halide perovskites: A comparison of performance under Sub-Saharan temperature condition
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Ozurumba, Anthony C., Ogueke, Nnamdi V., Madu, Chinyere A., Danladi, Eli, Mbachu, Chisom P., Yusuf, Abubakar S., Gyuk, Philibus M., and Hossain, Ismail
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- 2024
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5. Wind farm layout optimisation considering commercial wind turbines using parallel reference points, radial space division and reference vector guided EA-based approach
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Bouchekara, Houssem Rafik El-Hana, Sha’aban, Yusuf Abubakar, Shahriar, Mohammad Shoaib, Ramli, Makbul Anwari Muhammad, and Mas’ud, Abdullahi Abubakar
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- 2023
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6. Free-living bacteria stimulate sugarcane growth traits and edaphic factors along soil depth gradients under contrasting fertilization
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Nyumah Fallah, Muhammad Tayyab, Ziqi Yang, Ziqin Pang, Caifang Zhang, Zhaoli Lin, Lahand James Stewart, Mbuya Sylvain Ntambo, Ahmad Yusuf Abubakar, Wenxiong Lin, and Hua Zhang
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Medicine ,Science - Abstract
Abstract Free-living bacterial community and abundance have been investigated extensively under different soil management practices. However, little is known about their nitrogen (N) fixation abilities, and how their contributions to N budgets impact plant growth, yield, and carbon (C) and N cycling enzymes in a long-term consecutive sugarcane monoculture farming system, under contrasting amendments, along different soil horizons. Here, nifH gene amplicon was used to investigate diazotrophs bacterial community and abundance by leveraging high-throughput sequencing (HTS). Moreover, edaphic factors in three soil depths (0–20, 20–40, and 40–60 cm) under control (CK), organic matter (OM), biochar (BC), and filter mud (FM) amended soils were investigated. Our analysis revealed that β-glucosidase activity, acid phosphatase activity, ammonium (NH4 +-N), nitrate (NO3 –N), total carbon (TC), total nitrogen (TN), and available potassium (AK) were considerably high in 0–20 cm in all the treatments. We also detected a significantly high proportion of Proteobacteria and Geobacter in the entire sample, including Anabaena and Enterobacter in 0–20 cm soil depth under the BC and FM amended soils, which we believed were worthy of promoting edaphic factors and sugarcane traits. This phenomenon was further reinforced by network analysis, where diazotrophs bacteria belonging to Proteobacteria exhibited strong and positive associations soil electrical conductivity (EC), soil organic matter content (SOM) available phosphorus (AP), TN, followed by NH4+-N and NO3 –N, a pattern that was further validated by Mantel test and Pearson’s correlation coefficients analyses. Furthermore, some potential N-fixing bacteria, including Burkholderia, Azotobacter, Anabaena, and Enterobacter exhibited a strong and positive association with sugarcane agronomic traits, namely, sugarcane stalk, ratoon weight, and chlorophyll content. Taken together, our findings are likely to broaden our understanding of free-living bacteria N-fixation abilities, and how their contributions to key soil nutrients such as N budgets impact plant growth and yield, including C and N cycling enzymes in a long-term consecutive sugarcane monoculture farming system, under contrasting amendments, along different soil horizons.
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- 2023
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7. Plant growth and stress-regulating metabolite response to biochar utilization boost crop traits and soil health
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Nyumah Fallah, Ziqin Pang, Zhaoli Lin, Wenxiong Lin, Sylvain Ntambo Mbuya, Ahmad Yusuf Abubakar, Kabore Manegdebwaoga Arthur Fabrice, and Hua Zhang
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biochar ,metabolites ,crop traits ,soil health ,soil fertility ,Plant culture ,SB1-1110 - Abstract
IntroductionThe utilization of biochar (BC) as a soil amendment in agriculture has gained significant traction among many farmers and researchers, primarily due to its eco-friendly role in boosting crop output. However, the performance of specific metabolites (e.g., zeatin, melatonin, sucrose, and phenyllactic acid) in the various tissues of sugarcane plant (leaf, stem, and root) and rhizosphere soil-deemed plant growth and stress regulators in a long-term BC-amended field remains poorly understood. Additionally, literature on the shift in soil attributes and crop growth triggered by the strong response of these bioactive compounds to longterm BC utilization remains undocumented.MethodsMetabolome integrated with highthroughput sequencing analyses were conducted to identify and quantify the performance of plant growth and stress-regulating metabolites in a long-term BC-amended field. Additionally, we investigated how the response of these compounds to BC-treated soil influences crop traits and soil biochemical properties.ResultsWe also identified and quantified the performance of pathogenic bacteria and unraveled the association between these compounds and potential plant growth-promoting bacteria. The BC-supplemented soil significantly boosted the crop traits, including brix, sucrose content, and chlorophyll, as well as soil nutrients, such as soil total nitrogen (TN), ammonium (NH4+-N), and nitrate (NO3--N). We also noticed that metabolite-deemed plant growth and stress regulators, including melatonin and phenyllactic acid, were enriched considerably in the stem and root tissues of the BC-amended soil. Zeatin in the leaf, stem, and root tissues exhibited the same trend, followed by sucrose in the leaf tissue of the BC-treated soil, implying that the strong response of these compounds to BC utilization contributed to the promotion of crop traits and soil quality. Pathogenic bacteria belonging to Proteobacteria and Acidobacteria were suppressed under the BC-supplemented soil, especially in the root tissue and rhizosphere soil, whereas plant growth-regulating bacteria, mainly Bradyrhizobium, responded strongly and positively to several metabolites.DiscussionOur finding provides valuable information for agronomists, farmers, and environmentalists to make informed decisions about crop production, land use, and soil management practices. Proper soil assessment and understanding of the interaction between the attributes of soil, BC, and metabolites are essential for promoting sustainable agriculture practices and land conservation.
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- 2023
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8. Non-compartmental toxicokinetic studies of the Nigerian Naja nigricollis venom
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Bala, Auwal A., Malami, Sani, Muhammad, Yusuf Abubakar, Kurfi, Binta, Raji, Ismaila, Salisu, Sanusi Muhammad, Mohammed, Mustapha, Ambrose, George Oche, Jibril, Murtala, Galan, Jacob A., Sanchez, Elda E., and Chedi, Basheer A.Z.
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- 2022
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9. Determinants of mortality among hospitalized patients with COVID-19 during first and second waves of the pandemic: A retrospective cohort study from an isolation center in Kano, Nigeria.
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Farouq Muhammad Dayyab, Hussain Abdullahi Bashir, Abdulwahab Kabir Sulaiman, Garba Iliyasu, Muhammad Hamza, Ahmad Maifada Yakasai, Ibrahim Nashabaru, Hadiza Saidu, Bashir Garba Ahmad, Bashir Dabo, Aminu Yusuf Abubakar, Ibrahim Musa Idris, Abdulrauf Sani Yahaya, Mustapha Ado, Ibrahim Sabo Abdurrahman, Hafizu Musa Usman, Mohammed Kabiru Bello, Jaafar Suleiman Jaafar, Anifowose Abdullahi, Abubakar Muhammad Alhassan, Abdulmalik Ahmad, Alika Ehima Allen, Medu Oghenekevwe Ezekiel, Muhammad Abdullahi Umar, Muhammad B Abdullahi, Sahabi Kabir Sulaiman, Tijjani Hussaini, Amina Abdullahi Umar, Aminu Ibrahim Tsanyawa, Sabitu Y Shuaibu, Nasir Alhassan Kabo, Basheer Lawan Muhammad, Mohammed Nura Yahaya, Imam Wada Bello, Ashiru Rajab, Abdulhakim Muhammad Daiyab, Aminu Faruk Kabara, Muhammad Sule Garko, and Abdulrazaq Garba Habib
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Medicine ,Science - Abstract
BackgroundCoronavirus disease 2019 (COVID-19) has emerged as an important cause of morbidity and mortality worldwide. The aim of this study is to identify the clinical predictors of mortality among patients with COVID-19 pneumonia during first and second waves in a treatment center in northwestern Nigeria.MethodsThis was a retrospective cohort study of 195 patients hospitalized with COVID-19 between April 2020 to March 2021 at a designated COVID-19 isolation center in Kano State, Northwest Nigeria. Data were summarized using frequencies and percentages. Unadjusted odds ratios and 95% confidence intervals and p-values were obtained. To determine independent determinants of mortality, we performed a stepwise multivariate logistic regression model.ResultsOf 195 patients studied, 21(10.77%) patients died. Males comprised 158 (81.03%) of the study population. In the adjusted stepwise logistic regression analysis, age>64 years (OR = 9.476, 95% CI: 2.181-41.165), second wave of the pandemic (OR = 49.340, 95% CI:6.222-391.247), cardiac complications (OR = 24.984, 95% CI: 3.618-172.508), hypertension (OR = 5.831, 95% CI:1.413-24.065) and lowest systolic blood pressure while on admission greater than or equal to 90mmHg were independent predictors of mortality (OR = 0.111, 95%CI: 0.021-0.581).ConclusionStrategies targeted to prioritize needed care to patients with identified factors that predict mortality might improve patient outcome.
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- 2023
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10. Decomposition based multiobjective evolutionary algorithm for PV/Wind/Diesel Hybrid Microgrid System design considering load uncertainty
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Houssem Rafik El-Hana Bouchekara, Muhammad Sharjeel Javaid, Yusuf Abubakar Shaaban, Mohammad Shoaib Shahriar, Makbul Anwari Muhammad Ramli, and Yaqoub Latreche
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Hybrid system ,Wind energy ,PV ,Decomposition based multi-objective evolutionary algorithm ,Load uncertainty ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
This paper aims to optimally design a PV/Wind/Diesel Hybrid Microgrid System (HMS) for a small number of houses considering load uncertainty for the city of Yanbu, Saudi Arabia. Designing such a hybrid system with all the renewable and non-renewable sources, storage devices, converters, and loads is a complicated task. A multiobjective approach has been adopted to optimize the microgrid design. Two methodologies are available for solving such multiobjective problems. In the first approach, the problem is transformed into a single objective one (using aggregation, for instance), whereas, the second technique treats objectives simultaneously and independently as adopted in this paper. The proposed approach offers the Pareto front; a set of solutions in one run opening the door of choosing the most suitable solution from the available options based on the experience, expertise and requirement of the designer. This paper presents a novel approach of using Decomposition Based Multiobjective Evolutionary Algorithm (MOEA/D) to optimally design the PV/Wind/Diesel HMS considering load uncertainty. Loss of Power Supply Probability (LPSP) and Cost of Electricity (COE) are considered as the objective functions of the optimization problem. Furthermore, two separate load cases of 5 and 10 houses are tested to verify the robustness of the approach. The obtained results are beneficial in assisting researchers and practitioners in selecting the optimal configuration of the microgrid.
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- 2021
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11. Comprehensive kinetic model for acetylene pretreated mesoporous silica supported bimetallic Co-Ni catalyst during Fischer-Trospch synthesis
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Sun, Yong, Wang, Yixiao, He, Jun, Yusuf, Abubakar, Wang, Yunshan, Yang, Gang, and Xiao, Xin
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- 2021
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12. Effect of Biosynthesized Silver Nanoparticles on The Optical, Structural, and Morphological Properties of TiO2 Nanocrystals
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Tasiu, Jamila, primary, Onimisi, Muhammad Y., additional, Yusuf, Abubakar S., additional, Danladi, Eli, additional, and Tasie, Nicholas N., additional
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- 2024
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13. Effect of Electron Transport Layers, Interface Defect Density and Working Temperature on Perovskite Solar Cells Using SCAPS 1-D Software
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Yusuf, Abubakar S., primary, Ramalan, A.M., additional, Abubakar, A.A., additional, and Mohammed, I.K., additional
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- 2024
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14. Decomposition based multiobjective evolutionary algorithm for PV/Wind/Diesel Hybrid Microgrid System design considering load uncertainty
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Bouchekara, Houssem Rafik El-Hana, Javaid, Muhammad Sharjeel, Shaaban, Yusuf Abubakar, Shahriar, Mohammad Shoaib, Ramli, Makbul Anwari Muhammad, and Latreche, Yaqoub
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- 2021
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15. Epidemiology, diagnostics and factors associated with mortality during a cholera epidemic in Nigeria, October 2020–October 2021: a retrospective analysis of national surveillance data
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Chikwe Ihekweazu, Carina King, Puja Myles, Fatima Saleh, Tobias Alfvén, Emmanuel Pembi, Emmanuel Agogo, Chinwe Lucia Ochu, Samuel Ngishe, Hakeem Abiola Yusuff, Ifeoma Nwadiuto, Abbas Aliyu Mohammed, Nwando Mba, Elsie Ilori, John Oladejo, Ibrahim Mamadu, Oluwatosin Wuraola Akande, Lauryn Dunkwu, Nnaemeka Ndodo, David Olatunji, Kelly Elimian, Sebastian Yennan, Anwar Musah, Iliya Danladi Cheshi, Ahmed Ladan Mohammed, Eme Ekeng, Stephanie Ayres, Benjamin Gandi, Ahmed Nasir Omar, Emily Crawford, Olubunmi Omowumi Olopha, Robinson Nnaji, Basheer Muhammad, Rejoice Luka-Lawal, Adachioma Chinonso Ihueze, Chidimma Ojukwu, Afolabi Muftau Akinpelu, Ene Adaga, Yusuf Abubakar, Agnes Bosede Alowooye, Peace Chinma Nwogwugwu, Khadeejah Kamaldeen, Henry Nweke Abah, Egbuna Hyacinth Chukwuebuka, Sarah Peter, Okpachi Christopher Abbah, Popoola Michael Oladotun, Santino Oifoh, Micheal Olugbile, Olajumoke Babatunde, and Ifedayo Adetifa
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Medicine - Abstract
Objectives Nigeria reported an upsurge in cholera cases in October 2020, which then transitioned into a large, disseminated epidemic for most of 2021. This study aimed to describe the epidemiology, diagnostic performance of rapid diagnostic test (RDT) kits and the factors associated with mortality during the epidemic.Design A retrospective analysis of national surveillance data.Setting 33 of 37 states (including the Federal Capital Territory) in Nigeria.Participants Persons who met cholera case definition (a person of any age with acute watery diarrhoea, with or without vomiting) between October 2020 and October 2021 within the Nigeria Centre for Disease Control surveillance data.Outcome measures Attack rate (AR; per 100 000 persons), case fatality rate (CFR; %) and accuracy of RDT performance compared with culture using area under the receiver operating characteristic curve (AUROC). Additionally, individual factors associated with cholera deaths and hospitalisation were presented as adjusted OR with 95% CIs.Results Overall, 93 598 cholera cases and 3298 deaths (CFR: 3.5%) were reported across 33 of 37 states in Nigeria within the study period. The proportions of cholera cases were higher in men aged 5–14 years and women aged 25–44 years. The overall AR was 46.5 per 100 000 persons. The North-West region recorded the highest AR with 102 per 100 000. Older age, male gender, residency in the North-Central region and severe dehydration significantly increased the odds of cholera deaths. The cholera RDT had excellent diagnostic accuracy (AUROC=0.91; 95% CI 0.87 to 0.96).Conclusions Cholera remains a serious public health threat in Nigeria with a high mortality rate. Thus, we recommend making RDT kits more widely accessible for improved surveillance and prompt case management across the country.
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- 2022
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16. Distributed Control of an Ill-Conditioned Non-Linear Process Using Control Relevant Excitation Signals
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Sha’aban, Yusuf Abubakar and Sha’aban, Yusuf Abubakar
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Efficient control schemes for ill-conditioned systems, such as the high-purity distillation column, can be challenging and costly to design and implement. In this paper, we propose a distributed control scheme that utilizes well-designed excitation signals to identify the system. Unlike traditional systems, we found that a summation of correlated and uncorrelated signals can yield better excitation of the plant. Our proposed distributed model predictive control (MPC) scheme uses a shifted input sequence to address loop interactions and reduce the computational load. This approach deviates from traditional schemes that use iteration, which can increase complexity and computational load. We initially tested the proposed method on the linear model of a highly coupled 2 × 2 process and compared its performance with decentralized proportional-integral-derivative (PID) controllers and centralized MPC. Our results show improved performance over PID controllers and similar results to centralized MPC. Furthermore, we compared the performance of the proposed approach with a centralized MPC on a nonlinear model of a distillation column. The results for the second study also demonstrated comparable performance between the two controllers with the decentralised control slightly outperforming the centralised MPC in some cases. These findings are promising and may be of interest to practitioners that are more comfortable with tuning decentralised loops.
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- 2024
17. Non-compartmental toxicokinetic studies of the Nigerian Naja nigricollis venom
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Auwal A. Bala, Sani Malami, Yusuf Abubakar Muhammad, Binta Kurfi, Ismaila Raji, Sanusi Muhammad Salisu, Mustapha Mohammed, George Oche Ambrose, Murtala Jibril, Jacob A. Galan, Elda E. Sanchez, and Basheer A.Z. Chedi
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Snake venom ,Antisnake venom ,Toxicokinetics ,ELISA ,Naja nigricollis ,Pharmacometrics ,Toxicology. Poisons ,RA1190-1270 - Abstract
Snakebite envenoming (SBE) is a neglected public health problem, especially in Asia, Latin America and Africa. There is inadequate knowledge of venom toxicokinetics especially from African snakes. To mimic a likely scenario of a snakebite envenoming, we used an enzyme-linked immunosorbent assay (ELISA) approach to study the toxicokinetic parameters in rabbits, following a single intramuscular (IM) administration of Northern Nigeria Naja nigricollis venom. We used a developed and validated non-compartmental approach in the R package PK to determine the toxicokinetic parameters of the venom and subsequently used pharmacometrics modelling to predict the movement of the toxin within biological systems. We found that N. nigricollis venom contained sixteen venom protein families following a mass spectrometric analysis of the whole venom. Most of these proteins belong to the three-finger toxins family (3FTx) and venom phospholipase A2 (PLA2) with molecular weight ranging from 3 to 16 kDa. Other venom protein families were in small proportions with higher molecular weights. The N. nigricollis venom was rapidly absorbed at 0.5 h, increased after 1 h and continued to decrease until the 16th hour (Tmax), where maximum concentration (Cmax) was observed. This was followed by a decrease in concentration at the 32nd hour. The venom of N. nigricollis was found to have high volume of distribution (1250 ± 245 mL) and low clearance (29.0 ± 2.5 mL/h) with an elimination half-life of 29 h. The area under the curve (AUC) showed that the venom remaining in the plasma over 32 h was 0.0392 ± 0.0025 mg h.L−1, and the mean residence time was 43.17 ± 8.04 h. The pharmacometrics simulation suggests that the venom toxins were instantly and rapidly absorbed into the extravascular compartment and slowly moved into the central compartment. Our study demonstrates that Nigerian N. nigricollis venom contains low molecular weight toxins that are well absorbed into the blood and deep tissues. The venom could be detected in rabbit blood 48 h after intramuscular envenoming.
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- 2022
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18. Straw retention efficiently improves fungal communities and functions in the fallow ecosystem
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Caifang Zhang, Zhaoli Lin, Youxiong Que, Nyumah Fallah, Muhammad Tayyab, Shiyan Li, Jun Luo, Zichu Zhang, Ahmad Yusuf Abubakar, and Hua Zhang
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Sugarcane straw retention ,Soil profile ,Fungal community ,Network analysis ,FUNGuild analysis ,Microbiology ,QR1-502 - Abstract
Abstract Background Straw retention is a substitute for chemical fertilizers, which effectively maintain organic matter and improve microbial communities on agricultural land. The purpose of this study was to provide sufficient information on soil fungal community networks and their functions in response to straw retention. Hence, we used quantitative real-time PCR (qRT-PCR), Illumina MiSeq (ITS rRNA) and FUNGuild to examine ITS rRNA gene populations, soil fungal succession and their functions under control (CK) and sugarcane straw retention (SR) treatments at different soil layers (0–10, 10–20, 20–30, and 30–40 cm) in fallow fields. Result The result showed that SR significantly enhanced ITS rRNA gene copy number and Shannon index at 0–10 cm soil depth. Fungi abundance, OTUs number and ACE index decreased with the increasing soil depth. The ANOSIM analysis revealed that the fungal community of SR significantly differed from that of CK. Similarly, significant difference was also observed between topsoil (0–20 cm) and subsoil (20–40 cm). Compared with CK, SR decreased the relative abundance of the pathogen, while increased the proportion of saprotroph. Regarding soil depth, pathogen relative abundance in topsoil was lower than that in subsoil. Besides, both sugarcane straw retention and soil depths (topsoil and subsoil) significantly altered the co-occurrence patterns and fungal keystone taxa closely related to straw decomposition. Furthermore, both SR and topsoil had higher average clustering coefficients (aveCC), negative edges and varied modularity. Conclusions Overall, straw retention improved α-diversity, network structure and fungal community, while reduced soil pathogenic microbes across the entire soil profile. Thus, retaining straw to improve fungal composition, community stability and their functions, in addition to reducing soil-borne pathogens, can be an essential agronomic practice in developing a sustainable agricultural system.
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- 2021
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19. Improved model predictive load frequency control of interconnected power system with synchronized automatic generation control loops
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Abdullahi Bala Kunya, Mehmet Argin, Yusuf Jibril, and Yusuf Abubakar Shaaban
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Area control error ,Automatic voltage regulator ,Control area ,Load frequency control ,Model predictive control ,Medicine (General) ,R5-920 ,Science - Abstract
Abstract Background Automatic generation control (AGC) of multi-area interconnected power system (IPS) is often designed with negligible cross-coupling between the load frequency control (LFC) and automatic voltage regulation (AVR) loops. This is because the AVR loop is considerably faster than that of LFC. However, with the introduction of slow optimal control action on the AVR, positive damping effect can be achieved on the LFC loop thereby improving the frequency control. In this paper, LFC synchronized with AVR in three-area IPS is proposed. Model predictive controller (MPC) configured in a dense distributed pattern, due to its online set-point tacking is used as the supplementary controller. The dynamics of the IPS subjected to multi-area step and random load disturbances are studied. The efficacy of the developed scheme is ascertained by simulating the disturbed system in MATLAB/Simulink. Results Based on the comparative analysis on the system responses, it is established that by cross-coupling the LFC loop with AVR, reductions of 66.45% and 59.09% in the frequency and tie-line power maximum deviations respectively are observed, while the respective settling times are found to be reduced by 29.68% and 22.77% when compared with the uncoordinated control scheme. In addition, the standard deviation and variance of the integral time absolute error of the system’s responses have reduced by 23.21% and 20.83% respectively compared to those obtained in a similar study. Conclusions The reduction in the maximum deviations and settling times in the system states indicates that introducing the voltage control via AVR loop has improved the frequency control significantly. While the lower standard deviation and variance of the integral time absolute error signify improvement in the robustness of the developed algorithm. However, this improvement is at the detriment of the controller size and computational complexity. In the uncoordinated control scheme, the control vector is one-dimensional, while in the coordinated scheme, the control vector is two-dimensional for each CA.
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- 2020
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20. Nursing students' experiences of service-learning at community and hospital pharmacies in Belize: Pedagogical implications for nursing pharmacology.
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Danladi Chiroma Husaini, David D Mphuthi, Jane A Chiroma, Yusuf Abubakar, and Adeniyi O Adeleye
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Medicine ,Science - Abstract
ObjectivesMany students seem to find pharmacology learning very challenging due to the complexity and variety of drugs they have to study. The number of drugs the students have to learn, the duration of time to learn the medications, and the evolving nature of diseases demanded learning beyond the classroom walls. This study explored and described nursing students' experiences in community and hospital-based pharmacy practice sites during their service-learning and its implications for pharmacology pedagogical practices.MethodsKolb's learning theory provided the framework to explore nursing students' 48-hour service-learning experiences at community/hospital-based pharmacies in Belize and its implications for pharmacology pedagogy. The study utilized two qualitative approaches, reflective journals and focus group interviews, to collect data from 46 second-year nursing students. NVivo software and coding schemes were employed to analyze the data from the interviews and reflective journals.ResultsStudents reported learning medications, integrating classroom pharmacological knowledge at pharmacy practice sites, acquiring and enhancing communication skills, interpreting prescriptions, dispensing medications, drug calculations, taking inventory, doing vital signs, and patient education. In addition, students reported experiencing inter-professional relationships as healthcare team members. Anxiety was a major challenge experienced by many students at the beginning of the service-learning experience.ConclusionsThis study highlights the importance of experiential learning of pharmacology amongst second year nursing students, offering the opportunity to inform and support pharmacotherapeutics educators in designing strategies for more effective teaching of medications to nursing students. It also supports the addition of pharmacy placements to the nursing curriculum' as it shows that nursing students can learn medications, skills, and teamwork from experiential pharmacy site posting. Combining classroom instruction with pharmacy experiential service learning might be an effective complement for teaching nursing pharmacology.
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- 2022
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21. Filtered mud improves sugarcane growth and modifies the functional abundance and structure of soil microbial populations
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Ahmad Yusuf Abubakar, Muhammed Mustapha Ibrahim, Caifang Zhang, Muhammad Tayyab, Nyumah Fallah, Ziqi Yang, Ziqin Pang, and Hua Zhang
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Soil fertility ,Bacteria ,Fungi ,Soil enzymes ,High-throughput sequencing ,Sugarcane ,Medicine ,Biology (General) ,QH301-705.5 - Abstract
Background Exploring high-quality organic amendments has been a focus of sustainable agriculture. Filtered mud (FM), a sugar factory waste derived from sugarcane stems, could be an alternative organic amendment for sugarcane production. However, the effects of its application proportions on soil fertility, nutrient cycling, structure of soil bacterial and fungal communities, and the growth of sugarcane in clay-loam soils remain unexplored. Methods Three application proportions of FM: (FM1-(FM: Soil at 1:4), FM2-(FM: Soil at 2:3), and FM3-(FM: Soil at 3:2)) were evaluated on sugarcane growth and soil nutrient cycling. High throughput sequencing was also employed to explore soil microbial dynamics. Results We observed that FM generally increased the soil’s nutritional properties while improving NO3− retention compared to the control, resulting in increased growth parameters of sugarcane. Specifically, FM1 increased the concentration of NH4+−N, the N fraction preferably taken up by sugarcane, which was associated with an increase in the plant height, and more improved growth properties, among other treatments. An increase in the proportion of FM also increased the activity of soil nutrient cycling enzymes; urease, phosphatase, and β-glucosidase. High throughput sequencing revealed that FM reduced the diversity of soil bacteria while having insignificant effects on fungal diversity. Although increasing FM rates reduced the relative abundance of the phyla Proteobacteria, its class members, the Gammaproteobacteria and Betaproteobacteria containing some N-cycling related genera, were stimulated. Also, FM stimulated the abundance of beneficial and lignocellulose degrading organisms. These included the bacterial phyla Actinobacteria, Bacteroidetes, Acidobacteria, Chloroflexi, and the fungal phylum Ascomycota. The distribution of the soil microbial community under FM rates was regulated by the changes in soil pH and the availability of soil nutrients. Since FM1 showed more promise in improving the growth properties of sugarcane, it could be more economical and sustainable for sugarcane production in clay-loam soils.
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- 2022
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22. The Effect of Dead-Time and Damping Ratio on the Relative Performance of MPC and PID on Second Order Systems
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Yusuf Abubakar Sha’aban
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Model predictive control (MPC) ,PID ,second order system ,SOPDT ,control performance ,Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Biology (General) ,QH301-705.5 ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
Most industrial processes are regulated using PID control. However, many such processes often operate far from optimally because PID may not be the most suitable control method. Moreover, second-order models represent a large class of all controlled systems. This work studies the performance of some commonly used industrial PID controllers relative to MPC to understand when it is more suitable to use Model predictive control. MPC is used for this comparison because it has been the most successful industrial controller after PID. It can be concluded from the studies that improved performance can be achieved with MPC, even for modest dead time and when the damping ratio is relatively low. These improvements are prominent for dead-time dominant systems, whose dead-time to time-constant ratio is at least three.
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- 2023
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23. Development and Integration of Metocean Data Interoperability for Intelligent Operations and Automation Using Machine Learning: A Review
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Kamaluddeen Usman Danyaro, Haizatul Hafizah Hussain, Mujaheed Abdullahi, M. S. Liew, Lim Eu Shawn, and Mustapha Yusuf Abubakar
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data interoperability ,Metocean ,oil and gas ,artificial intelligence ,machine learning ,automation ,Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Biology (General) ,QH301-705.5 ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
The current oil industry is moving towards digitalization, which is a good opportunity that will bring value to all its stakeholders. The digitalization of oil and gas discovery, which are production-based industries, is driven by enabling technologies which include machine learning (ML) and big data analytics. However, the existing Metocean system generates data manually using sensors such as the wave buoy, anemometer, and acoustic doppler current profiler (ADCP). Additionally, these data which appear in ASCII format to the Metocean system are also manual and silos. This slows down provisioning, while the monitoring element of the Metocean data path is partial. In this paper, we demonstrate the capabilities of ML for the development of Metocean data integration interoperability based on intelligent operations and automation. A comprehensive review of several research studies, which explore the needs of ML in oil and gas industries by investigating the in-depth integration of Metocean data interoperability for intelligent operations and automation using an ML-based approach, is presented. A new model integrated with the existing Metocean data system using ML algorithms to monitor and interoperate with maximum performance is proposed. The study reveals that ML is one of the crucial and key enabling tools that the oil and gas industries are now focused on for implementing digital transformation, which allows the industry to automate, enhance production, and have less human capacity. Lastly, user recommendations for potential future investigations are offered.
- Published
- 2022
- Full Text
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24. Depth-dependent influence of biochar application on the abundance and community structure of diazotrophic under sugarcane growth.
- Author
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Nyumah Fallah, Ziqi Yang, Muhammad Tayyab, Caifang Zhang, Ahmad Yusuf Abubakar, Zhaoli Lin, Ziqin Pang, Americ Allison, and Hua Zhang
- Subjects
Medicine ,Science - Abstract
Despite progress in understanding diazotrophic distribution in surface soils, few studies have investigated the distribution of diazotrophic bacteria in deeper soil layers. Here, we leveraged high-throughput sequencing (HTS) of nifH genes obtained to assess the influence of biochar amended soil (BC) and control (CK), and soil depths (0-20, 20-40 and 40-60 cm) on diazotrophic abundance and community structures, soil enzyme activities and physio-chemical properties. Multivariate ANOVA analysis revealed that soil depth had profound impact on majority of the soil parameters measured than fertilization. Although soil physio-chemical properties, enzymes activities, diazotrophic genera and enriched operational taxonomic units (OTUs) were significantly influenced across the entire soil profiles, we also observed that BC amended soil significantly increased cane stalk height and weight, nitrate (NO3-), ammonium (NH4+), organic matter (OM), total carbon (TC) and available potassium (AK), and enhanced diazotrophic genera in soil depth 0-20 cm compared to CK treatment. Soil TC, total nitrogen (TN), OM and NH4+ were the major impact factors shifting diazotrophic community structures in soil depth 0-20 cm. Overall, these results were more pronounced in 0-20 cm soil depth in BC than CK treatment.
- Published
- 2021
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- View/download PDF
25. Improved model predictive load frequency control of interconnected power system with synchronized automatic generation control loops
- Author
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Kunya, Abdullahi Bala, Argin, Mehmet, Jibril, Yusuf, and Shaaban, Yusuf Abubakar
- Published
- 2020
- Full Text
- View/download PDF
26. Radiogenic heat production estimation towards sustainable energy drive in northeastern Nigeria
- Author
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Yusuf, Abubakar, primary, San, Lim Hwee, additional, and Abir, Ismail Ahmad, additional
- Published
- 2023
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27. Pharmacological activities of Azanza garckeana (Goron Tula) grown in Nigeria
- Author
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Yusuf, Abubakar Awwal, Lawal, Bashir, Sani, Saidu, Garba, Rahinat, Mohammed, Bala Alkali, Oshevire, David Bini, and Adesina, Daniel Anuoluwa
- Published
- 2020
- Full Text
- View/download PDF
28. Assessment of ICT Skills Application of Teacher Educators in Kwara State Colleges of Education, Nigeria
- Author
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Fashiku Christopher Oluwatoyin, Yusuf Abubakar Abiola, Olowo Busuyi Francis, Ayoku Oba Baba, and Fashiku Bunmi Comfort
- Subjects
General Medicine - Abstract
The study was carried out to assess the Information and Communication Technology (ICT) skills application of teacher educators in Kwara State Colleges of Education, Nigeria. The descriptive survey research design was adopted; the population of the study comprised 430 lecturers from Kwara State Colleges of Education Oro, Lafiagi, and Ilorin, respectively. A proportional sampling technique was used to select 160 respondents from the two teacher educator institutions. A simple random sampling technique was used in selecting 60 respondents from Oro College of Education and 100 respondents from Kwara State College of Education Ilorin. One self-designed questionnaire titled ‘Assessment of ICT Competency Skills of Lecturers’ (AICTCSL) with four points Liker scale was used to elicit information from the respondents. The instrument was validated. Its reliability was ensured at .78. Total Average Weighted Response (TAWR), and percentage and frequency counts were used in analyzing the collected data for the raised research questions at .05 levels of significance, while z-test statistics were used in addressing the formulated hypotheses. It was discovered in the study that lecturers in the used institutions were competent in manipulating the computer keyboard and connecting to the internet but were not competent in accessing the information on CD, organizing electronic files into folders, use of application software, use of PowerPoint, word excel and blog website. Also, no significant difference was established between the mean scores of lecturers in Kwara State Colleges of education Oro and Ilorin on their ICT skills acquisition and use, while there was a significant difference in the mean ratings of teacher educators from Oro and Ilorin on their use of application software competency. It was therefore recommended that government should make it a matter of policy that all lecturers in the institutions are ICT literate and it should be a prerequisite for their promotion and recruitment for a lecturing job in the state.
- Published
- 2022
29. EFFECT OF BIOSYNTHESIZED SILVER NANOPARTICLES ON THE OPTICAL, STRUCTURAL, AND MORPHOLOGICAL PROPERTIES OF TiO2 NANOCRYSTALS.
- Author
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Tasiu, Jamila, Onimisi, Muhammad Y., Yusuf, Abubakar S., Danladi, Eli, and Tasie, Nicholas N.
- Subjects
SILVER nanoparticles ,NANOCRYSTALS ,X-ray diffraction ,SCANNING electron microscopy ,LIGHT scattering - Abstract
The development of efficient metal doped semiconductors for Photovoltaic applications has gained a lot of research attention. In this present paper, pure and silver nanoparticles (AgNPs)-modified TiO
2 nanocrystals (NCs) with different amount of AgNPs (say 50, 100, 150, 200, and 250 µL) were achieved and the effects of AgNPs on the TiO2 NCs were explored systematically. The optical, structural and morphological properties were probed using UV-visible spectrophotometer, X-ray diffraction (XRD), and scanning electron microscope (SEM). The results of the optical studies showed a characteristic peak of TiO2 and the redshifting of the peak position was observed by introducing AgNPs. The synergetic effects from AgNPs and TiO2 results to diminished band gap. The XRD result confirmed the formation of a tetragonal anatase TiO2 phase with a decrease in crystallite size with increasing AgNPs content. The SEM images show enhanced nucleation and film growth with presence of shining surface which can be seen to contribute to good photon management by enhancing light scattering. The unadulterated TiO2 and AgNPs-modified TiO2 have spherical morphology and uniform size distribution ranging from 20 to 30 nm. This study established the view that surface modification of TiO2 with AgNPs is a viable approach towards achieving an efficient light photocatalyst. [ABSTRACT FROM AUTHOR]- Published
- 2024
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- View/download PDF
30. Distributed Control of an Ill-Conditioned Non-Linear Process Using Control Relevant Excitation Signals.
- Author
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Sha'aban, Yusuf Abubakar
- Subjects
PID controllers ,PREDICTION models ,DISTILLATION ,TEST methods - Abstract
Efficient control schemes for ill-conditioned systems, such as the high-purity distillation column, can be challenging and costly to design and implement. In this paper, we propose a distributed control scheme that utilizes well-designed excitation signals to identify the system. Unlike traditional systems, we found that a summation of correlated and uncorrelated signals can yield better excitation of the plant. Our proposed distributed model predictive control (MPC) scheme uses a shifted input sequence to address loop interactions and reduce the computational load. This approach deviates from traditional schemes that use iteration, which can increase complexity and computational load. We initially tested the proposed method on the linear model of a highly coupled 2 × 2 process and compared its performance with decentralized proportional-integral-derivative (PID) controllers and centralized MPC. Our results show improved performance over PID controllers and similar results to centralized MPC. Furthermore, we compared the performance of the proposed approach with a centralized MPC on a nonlinear model of a distillation column. The results for the second study also demonstrated comparable performance between the two controllers with the decentralised control slightly outperforming the centralised MPC in some cases. These findings are promising and may be of interest to practitioners that are more comfortable with tuning decentralised loops. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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- View/download PDF
31. Tingkah Laku Pelajar Universiti Dalam Penggunaan, Perbelanjaan Dan Pelaburan (University Students' Behavior in Consumption, Expenditure and Investment)
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Lai, Wei Sieng, Suresh, Preevetha, Yusuf, Abubakar Usman, Ardo, Abu Mohammed, Lai, Wei Sieng, Suresh, Preevetha, Yusuf, Abubakar Usman, and Ardo, Abu Mohammed
- Abstract
Tingkahlaku penggunaan, perbelanjaan, dan pelaburan dalam kalangan pelajar universiti sangat penting kerana di negara membangun seperti Malaysia, tingkah laku ini memainkan peranan penting sebagai pemangkin pertumbuhan dan pembangunan ekonomi. Penggunaan dan perbelanjaan mendorong pelaburan untuk mencetuskan pertumbuhan ekonomi negara. Kurang kajian yang difokuskan kepada tingkah laku kewangan pelajar universiti dan kebanyakan kajian ini tidak dilakukan secara teori dan hanya tertumpu pada faktor tunggal. Oleh itu, kajian ini adalah untuk mengetahui lebih lanjut mengenai pelajar universiti dan untuk mengisi jurang pengetahuan mengenai tingkah laku perbelanjaan, simpanan dan pelaburan mereka. Kajian ini menggunakan pendekatan kuantitatif di mana data untuk kajian ini diperoleh melalui kaedah tinjauan yang disasarkan kepada pelajar sarjanamuda Universiti Kebangsaan Malaysia (UKM). Sebanyak 300 set soal selidik telah diedarkan secara dalam talian. Hasil kajian mendapati rata-rata pelajar universiti menghabiskan lebih 30% daripada duit pembiayaan mereka. Kajian ini juga mendapati bahawa kebanyakan pelajar universiti yang melabur di pasaran saham adalah berisiko dan majoriti pelajar universiti tidak gemar melabur dalam pelaburan berisiko tinggi. Kajian ini mencadangkan bahawa kaedah komunikasi yang lebih baik antara pelajar universiti dan institusi kewangan atau bank melalui media dalam talian seperti melalui e-mel dan komunikasi media sosial adalah salah satu langkah untuk memupuk sikap pelaburan dan penyimpanan dalam kalangan pelajar universiti.
- Published
- 2023
32. Kebijaksanaan Dan Strategi Keusahawanan Islam Pasca Covid-19 (Post Covid-19 Islamic Entrepreneurial Wisdom and Strategy)
- Author
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Abdullah, Syahrina, Rofie, Mohamad Khadafi, Yusuf, Abubakar Usman, Ardo, Abu Mohammed, Abdullah, Syahrina, Rofie, Mohamad Khadafi, Yusuf, Abubakar Usman, and Ardo, Abu Mohammed
- Abstract
Pandemik Covid-19 yang melanda pada awal tahun 2020 telah memberi impak besar kepada majoriti usahawan di Malaysia. Situasi pandemik yang berlarutan sejak tahun 2020 ini telah mencetuskan kelembapan ekonomi negara terutama kepada peniaga dan usahawan mikro, kecil dan sederhana. Pendekatan strategik dan dinamik yang ditekankan dalam agama Islam dilihat dapat memberi penyelesaian kepada individu dan usahawan yang berhadapan dengan kemelut ekonomi ketika dan pasca pandemik Covid-19. Kajian konseptual digunakan bagi mengenal pasti konsep kebijaksanaan strategi tokoh Islam iaitu dari sudut prinsip, etika, pengetahuan dan spiritual bagi menyelesaikan permasalahan pengurusan perniagaan dalam mendepani isu pandemik Covid-19. Kaedah dokumentasi digunakan untuk mendapatkan data yang berkaitan dengan kebijaksanaan strategi tokoh Islam dengan merujuk kepada Al-Quran, Hadis dan sejarah Islam sebagai sumber autentik dalam membina konsep ini. Strategi yang dibentuk ini mengutarakan kebijaksanaan tindakan usahawan Islam berteraskan panduan Illahi melalui prinsip, etika, pengetahuan dan spiritual. Kesimpulannya, konsep strategi yang diketengahkan dalam kajian ini wajar diikuti oleh para usahawan Muslim masa kini untuk menempa kejayaan berteraskan perspektif Islam dalam menguruskan diri, organisasi serta perniagaan.
- Published
- 2023
33. The Impact of Forensic Accounting on Tax Payer Attitude and Compliance Towards Tax Evasion Within SMEs in The North East Nigeria
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Haruna, Haruna Tijjani, Ibrahim, Abdulrazaq Suleiman, Yusuf, Abubakar Usman, Ardo, Abu Mohammed, Haruna, Haruna Tijjani, Ibrahim, Abdulrazaq Suleiman, Yusuf, Abubakar Usman, and Ardo, Abu Mohammed
- Abstract
Income tax has contributed to a considerable amount of Nigeria’s revenue generation, despite the fact that it is fraught with difficulties in both collection and execution. This study examines the impact of forensic accounting on tax payer attitude and compliance towards tax evasion within SMEs in the north east Nigeria. The study is cross- sectional, with data collected using simple random sampling. With the help of Smart PLS 3, partial least square structural equation modelling PLS-SEM on 102 responses was utilized to evaluate the data. The findings revealed that a forensic accounting check is required to address the issue of tax evasion in Nigeria to ensure a good attitude and compliance. Forensic Accounting (FA) improves Tax payers Attitude (TA) and Tax Compliance (TC) when they interact. Hence, when a taxpayer develops a positive attitude and comply with the tax laws, they are more likely to have a good financial record and the state would have better control over the tax evasion scale. In other words, small and medium enterprises (SMEs) in the Northeast are more inclined to tax commitment if they are checked, and if the government use their contributions toward improving their standard of living, this will develop a positive attitude toward the behaviour of taxpayers in the region. Therefore, the government should provide awareness on the uses of tax revenue through sustainable enterprise support, infrastructure, and social welfare.
- Published
- 2023
34. The Effect of Dead-Time and Damping Ratio on the Relative Performance of MPC and PID on Second Order Systems
- Author
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Massachusetts Institute of Technology. Center for International Studies, Sha’aban, Yusuf Abubakar, Massachusetts Institute of Technology. Center for International Studies, and Sha’aban, Yusuf Abubakar
- Abstract
Most industrial processes are regulated using PID control. However, many such processes often operate far from optimally because PID may not be the most suitable control method. Moreover, second-order models represent a large class of all controlled systems. This work studies the performance of some commonly used industrial PID controllers relative to MPC to understand when it is more suitable to use Model predictive control. MPC is used for this comparison because it has been the most successful industrial controller after PID. It can be concluded from the studies that improved performance can be achieved with MPC, even for modest dead time and when the damping ratio is relatively low. These improvements are prominent for dead-time dominant systems, whose dead-time to time-constant ratio is at least three.
- Published
- 2023
35. Multi-Objective Optimization of a Hybrid Nanogrid/Microgrid: Application to Desert Camps in Hafr Al-Batin
- Author
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Houssem Rafik Al-Hana Bouchekara, Mohammad Shoaib Shahriar, Muhammad Sharjeel Javaid, Yusuf Abubakar Sha’aban, and Makbul Anwari Muhammad Ramli
- Subjects
desert camps ,diesel generator ,nanogrid ,microgrid ,multi-objective evolutionary algorithm ,multi-objective optimization ,Technology - Abstract
This paper presents an optimal design for a nanogrid/microgrid for desert camps in the city of Hafr Al-Batin in Saudi Arabia. The camps were designed to operate as separate nanogrids or to operate as an interconnected microgrid. The hybrid nanogrid/microgrid considered in this paper consists of a solar system, storage batteries, diesel generators, inverter, and load components. To offer the designer/operator various choices, the problem was formulated as a multi-objective optimization problem considering two objective functions, namely: the cost of electricity (COE) and the loss of power supply probability (LPSP). Furthermore, various component models were implemented, which offer a variety of equipment compilation possibilities. The formulated problem was then solved using the multi-objective evolutionary algorithm, based on both dominance and decomposition (MOEA/DD). Two cases were investigated corresponding to the two proposed modes of operation, i.e., nanogrid operation mode and microgrid operation mode. The microgrid was designed considering the interconnection of four nanogrids. The obtained Pareto front (PF) was reported for each case and the solutions forming this front were discussed. Based on this investigation, the designer/operator can select the most appropriate solution from the available set of solutions using his experience and other factors, e.g., budget, availability of equipment and customer-specific requirements. Furthermore, to assess the quality of the solutions found using the MOEA/DD, three different methods were used, and their results compared with the MOEA/DD. It was found that the MOEA/DD obtained better results (nondominated solutions), especially for the microgrid operation mode.
- Published
- 2021
- Full Text
- View/download PDF
36. Geoelectrical Assessment of Groundwater Potential within Zamfara and its Environs, Northwestern Nigeria
- Author
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Mahi, Shuaibu, Yusuf, Abubakar, and Lawal, Garba
- Subjects
Vertical electrical sounding ,Fractured layer ,Saturated Sandstone ,Basement rock units ,Gundumi formation - Abstract
Groundwater potential assessment was carried out within Zamfara environs, Northwestern Nigeria using geoelectrical technique with a view of solving the problem of incessant failure of boreholes in the study area. A total of one hundred and eighty-three (183) vertical electrical soundings (VES) were used to identify potential groundwater bearing zones capable of sustaining economic development of the study area. Two hydrogeological units were investigated (basement rock units and sedimentary rock unit), using Omega resistivity meter Model No. 122, to measure and record the resistance of the subsurface by Schlumberger configuration. The data obtained were interpreted quantitatively and qualitatively using the partial curve matching and computer iteration techniques to generate the first order geoelectric parameters. Generally, the VES result from the basement rock units revealed, four geoelectric layers which correspond to lateritic top soil, weathered basement (clay), partially fractured layer/fractured layer and fresh basement. The weathered/fractured layer was identified as the water bearing layer, within the basement rock units of the study area. From geospatial analysis of both weathered thickness/fracture thickness layers, South and Northeastern part tends to be the most prospective area with the best hydrogeologic conditions for borehole siting within the basement rock units. Consequently, three geo-electric layers were delineated from VES result obtained from Gundumi formation, which correspond to sandy clayey top/gravelly sandy top soil, second layer are mostly silty-clay/compacted sandstone/sandy gravel layers, the third layer were majorly saturated sandstone in some instances silty clay. However, the aquiferous layer is saturated sandstone/sandy gravel layer. The Dar Zarrouk result revealed excellent groundwater potential within the Gundumi formation. The values of coefficient anisotropy obtained from Gundumi rock units range from 0.44 to 3.79, which implies moderate saturation of groundwater. This is an indication that the aquifers of the Gundumi formation is more promising and it can be tap for both domestic and agricultural uses. Keywords: Vertical electrical sounding; Fractured layer; Saturated Sandstone; Basement rock units; Gundumi formation
- Published
- 2022
37. THE IMPACT OF FORENSIC ACCOUNTING ON TAX PAYER ATTITUDE AND COMPLIANCE TOWARDS TAX EVASION WITHIN SMES IN THE NORTH EAST NIGERIA
- Author
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Haruna, Haruna Tijjani, primary, Ibrahim, Abdulrazaq Suleiman, additional, Yusuf, Abubakar Usman, additional, and Ardo, Abu Mohammed, additional
- Published
- 2023
- Full Text
- View/download PDF
38. The Effect of Dead-Time and Damping Ratio on the Relative Performance of MPC and PID on Second Order Systems
- Author
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Sha’aban, Yusuf Abubakar, primary
- Published
- 2023
- Full Text
- View/download PDF
39. Toxicological evaluation of aqueous leaf extract of Terminalia catappa linn (combretaceae) in pregnant rats
- Author
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Magaji, Shehu Yakubu, primary, Abdullahi, Murtala, additional, Ibrahim, Zainab Gambo, additional, Yunusa, Suleiman, additional, John, Agbo, additional, Muhammad, Ibrahim, additional, Muhammad, Yusuf Abubakar, additional, Malami, Sani, additional, and Chedi, Basheer Zubairu, additional
- Published
- 2023
- Full Text
- View/download PDF
40. Decomposition based multiobjective evolutionary algorithm for PV/Wind/Diesel Hybrid Microgrid System design considering load uncertainty
- Author
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Yusuf Abubakar Sha’aban, Mohammad Shoaib Shahriar, Houssem R. E. H. Bouchekara, Yaqoub Latreche, Makbul A.M. Ramli, and M. S. Javaid
- Subjects
Mathematical optimization ,Optimization problem ,Computer science ,020209 energy ,Evolutionary algorithm ,PV ,02 engineering and technology ,Load uncertainty ,Multi-objective optimization ,TK1-9971 ,Hybrid system ,General Energy ,020401 chemical engineering ,Robustness (computer science) ,0202 electrical engineering, electronic engineering, information engineering ,Systems design ,Electrical engineering. Electronics. Nuclear engineering ,Microgrid ,0204 chemical engineering ,Cost of electricity by source ,Wind energy ,Decomposition based multi-objective evolutionary algorithm - Abstract
This paper aims to optimally design a PV/Wind/Diesel Hybrid Microgrid System (HMS) for a small number of houses considering load uncertainty for the city of Yanbu, Saudi Arabia. Designing such a hybrid system with all the renewable and non-renewable sources, storage devices, converters, and loads is a complicated task. A multiobjective approach has been adopted to optimize the microgrid design. Two methodologies are available for solving such multiobjective problems. In the first approach, the problem is transformed into a single objective one (using aggregation, for instance), whereas, the second technique treats objectives simultaneously and independently as adopted in this paper. The proposed approach offers the Pareto front; a set of solutions in one run opening the door of choosing the most suitable solution from the available options based on the experience, expertise and requirement of the designer. This paper presents a novel approach of using Decomposition Based Multiobjective Evolutionary Algorithm (MOEA/D) to optimally design the PV/Wind/Diesel HMS considering load uncertainty. Loss of Power Supply Probability (LPSP) and Cost of Electricity (COE) are considered as the objective functions of the optimization problem. Furthermore, two separate load cases of 5 and 10 houses are tested to verify the robustness of the approach. The obtained results are beneficial in assisting researchers and practitioners in selecting the optimal configuration of the microgrid.
- Published
- 2021
41. Refinement of Extended Accelerated Over-Relaxation Method for Solution of Linear Systems
- Author
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YA Yahaya, KR Adeboye, Usman Yusuf Abubakar, and KJ Audu
- Subjects
Matrix (mathematics) ,Rate of convergence ,Iterative method ,Spectral radius ,Linear system ,Convergence (routing) ,Applied mathematics ,System of linear equations ,Mathematics ,Diagonally dominant matrix - Abstract
Given any linear stationary iterative methods in the form z^(i+1)=Jz^(i)+f, where J is the iteration matrix, a significant improvements of the iteration matrix will decrease the spectral radius and enhances the rate of convergence of the particular method while solving system of linear equations in the form Az=b. This motivates us to refine the Extended Accelerated Over-Relaxation (EAOR) method called Refinement of Extended Accelerated Over-Relaxation (REAOR) so as to accelerate the convergence rate of the method. In this paper, a refinement of Extended Accelerated Over-Relaxation method that would minimize the spectral radius, when compared to EAOR method, is proposed. The method is a 3-parameter generalization of the refinement of Accelerated Over-Relaxation (RAOR) method, refinement of Successive Over-Relaxation (RSOR) method, refinement of Gauss-Seidel (RGS) method and refinement of Jacobi (RJ) method. We investigated the convergence of the method for weak irreducible diagonally dominant matrix, matrix or matrix and presented some numerical examples to check the performance of the method. The results indicate the superiority of the method over some existing methods.
- Published
- 2021
42. Epidemiology, diagnostics and factors associated with mortality during a cholera epidemic in Nigeria, October 2020-October 2021: a retrospective analysis of national surveillance data
- Author
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Kelly Elimian, Sebastian Yennan, Anwar Musah, Iliya Danladi Cheshi, Carina King, Lauryn Dunkwu, Ahmed Ladan Mohammed, Eme Ekeng, Oluwatosin Wuraola Akande, Stephanie Ayres, Benjamin Gandi, Emmanuel Pembi, Fatima Saleh, Ahmed Nasir Omar, Emily Crawford, Olubunmi Omowumi Olopha, Robinson Nnaji, Basheer Muhammad, Rejoice Luka-Lawal, Adachioma Chinonso Ihueze, David Olatunji, Chidimma Ojukwu, Afolabi Muftau Akinpelu, Ene Adaga, Yusuf Abubakar, Ifeoma Nwadiuto, Samuel Ngishe, Agnes Bosede Alowooye, Peace Chinma Nwogwugwu, Khadeejah Kamaldeen, Henry Nweke Abah, Egbuna Hyacinth Chukwuebuka, Hakeem Abiola Yusuff, Ibrahim Mamadu, Abbas Aliyu Mohammed, Sarah Peter, Okpachi Christopher Abbah, Popoola Michael Oladotun, Santino Oifoh, Micheal Olugbile, Emmanuel Agogo, Nnaemeka Ndodo, Olajumoke Babatunde, Nwando Mba, John Oladejo, Elsie Ilori, Tobias Alfvén, Puja Myles, Chinwe Lucia Ochu, Chikwe Ihekweazu, and Ifedayo Adetifa
- Subjects
Diarrhea ,Male ,Cholera ,Humans ,Nigeria ,Female ,General Medicine ,Reagent Kits, Diagnostic ,Epidemics ,Disease Outbreaks ,Retrospective Studies - Abstract
ObjectivesNigeria reported an upsurge in cholera cases in October 2020, which then transitioned into a large, disseminated epidemic for most of 2021. This study aimed to describe the epidemiology, diagnostic performance of rapid diagnostic test (RDT) kits and the factors associated with mortality during the epidemic.DesignA retrospective analysis of national surveillance data.Setting33 of 37 states (including the Federal Capital Territory) in Nigeria.ParticipantsPersons who met cholera case definition (a person of any age with acute watery diarrhoea, with or without vomiting) between October 2020 and October 2021 within the Nigeria Centre for Disease Control surveillance data.Outcome measuresAttack rate (AR; per 100 000 persons), case fatality rate (CFR; %) and accuracy of RDT performance compared with culture using area under the receiver operating characteristic curve (AUROC). Additionally, individual factors associated with cholera deaths and hospitalisation were presented as adjusted OR with 95% CIs.ResultsOverall, 93 598 cholera cases and 3298 deaths (CFR: 3.5%) were reported across 33 of 37 states in Nigeria within the study period. The proportions of cholera cases were higher in men aged 5–14 years and women aged 25–44 years. The overall AR was 46.5 per 100 000 persons. The North-West region recorded the highest AR with 102 per 100 000. Older age, male gender, residency in the North-Central region and severe dehydration significantly increased the odds of cholera deaths. The cholera RDT had excellent diagnostic accuracy (AUROC=0.91; 95% CI 0.87 to 0.96).ConclusionsCholera remains a serious public health threat in Nigeria with a high mortality rate. Thus, we recommend making RDT kits more widely accessible for improved surveillance and prompt case management across the country.
- Published
- 2022
43. The Design of an Intelligent Healthcare Chatbot for Managing Ante-Natal Recommendations
- Author
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Aishat Abdullahi, Naseer Sanni Ajoge, Yusuf Abubakar, and Mohammed Auwal Ahmed
- Abstract
Chatbot is an Artificial Intelligent technology (AI) that has been used in several computer assistive social interactions. They are designed to convincingly simulate how humans behave in a natural conversation with a partner. Information Technology and AI have been deployed in health care especially in medical information but such deployment can be enhanced with a chatbot in antenatal services. Maternal and newborn mortality is still on the rise in Nigeria and medical personnel are in short supply, hence a virtual expert that can assist the pregnant mothers in basic medical advice is suitable. A preliminary survey was conducted to ensure the desirability of the system where data obtained from two categories of respondents, medical experts and beneficiaries (pregnant mothers) were analyzed and the result shows that both categories of respondents generally agreed on the desirability of the antenatal chatbot. Objective: The proposed design in this paper suggests a Microsoft Azure server hosting and managing the knowledge-based back end. Method: It applies Deep Neural Network engine for analyzing the user queries and generating responses using Artificial Intelligence Markup Language (AIML). A good and implementable prototype from our design will ensure an ante-natal chatbot (Ante-natalbot) system that can analyze preferences of the users and be able to intelligently predict or provide better user-centric recommendations. Result: This intelligence will be achieved at the full implementation of the Ante-natalbot system with reference to the expert (physician) responses over time. Conclusion: This paper is an early step into exploring the concepts, and the acceptability of such a system by the practitioners and the beneficiaries (pregnant women). It serves as in-road into the implementation of a virtual system that simulate professional personnel services to the ante-natal service seekers.
- Published
- 2022
- Full Text
- View/download PDF
44. In-vitro antioxidants, antimicrobial and toxicological evaluation of Nigerian Zingiber officinale
- Author
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Yusuf, Abubakar A., Lawal, Bashir, Abubakar, Asmau N., Berinyuy, Eustace B., Omonije, Yemisi O., Umar, Sheriff I., Shebe, Mohammed N., and Alhaji, Yusuf M.
- Published
- 2018
- Full Text
- View/download PDF
45. Bacteria with Different Assemblages in the Soil Profile Drive the Diverse Nutrient Cycles in the Sugarcane Straw Retention Ecosystem
- Author
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Caifang Zhang, Muhammad Tayyab, Ahmad Yusuf Abubakar, Ziqi Yang, Ziqin Pang, Waqar Islam, Zhaoli Lin, Shiyan Li, Jun Luo, Xiaoliang Fan, Nyumah Fallah, and Hua Zhang
- Subjects
soil profile ,sugarcane straw retention ,soil enzymes ,soil fertility ,16s rrna gene amplicon ,bacterial communities ,Biology (General) ,QH301-705.5 - Abstract
Straw retention, an alternative to artificial fertilization, commonly mitigates soil degradation and positively affects soil fertility. In this study, we investigated the succession of soil bacteria during two sugarcane straw retention treatments (control (CK) and sugarcane straw retention (SR)) and at four depths (0−10, 10−20, 20−30, and 30−40 cm) in fallow soil in a sugarcane cropping system. Using an Illumina MiSeq (16S rRNA) and soil enzyme activity, we explored the SR influence on soil bacterial communities and enzyme activities and its inclusive impact on soil fertility, with an emphasis on topsoil (0−10 cm) and subsoil (10−40 cm). Our results show that SR effectively improved soil fertility indicators (C, N, and P), including enzyme activities (C and N cycling), throughout the soil profile: these soil parameters greatly improved in the topsoil compared to the control. Sugarcane straw retention and soil depth (0−10 cm vs. 10−40 cm) were associated with little variation in bacterial species richness and alpha diversity throughout the soil profile. Subsoil and topsoil bacterial communities differed in composition. Compared to the CK treatment, SR enriched the topsoil with Proteobacteria, Verrucomicrobia, Actinobacteria, Chloroflexi, and Nitrospirae, while the subsoil was depleted in Nitrospirae and Acidobacteria. Similarly, SR enriched the subsoil with Proteobacteria, Verrucomicrobia, Actinobacteria, Chloroflexi, Gemmatimonadetes, and Bacteroidetes, while the topsoil was depleted in Acidobacteria, Gemmatimonadetes, and Planctomycetes compared to the CK. At the genus level, SR enriched the topsoil with Gp1, Gp2, Gp5, Gp7, Gemmatimonas, Kofleria, Sphingomonas, and Gaiella, which decompose lignocellulose and contribute to nutrient cycling. In summary, SR not only improved soil physicochemical properties and enzyme activities but also enriched bacterial taxa involved in lignocellulosic decomposition and nutrient cycling (C and N) throughout the soil profile. However, these effects were stronger in topsoil than in subsoil, suggesting that SR enhanced fertility more in topsoil than in subsoil in fallow land.
- Published
- 2019
- Full Text
- View/download PDF
46. LEADERS-FOLLOWERS RELATIONSHIP AND ORGANISATIONAL EFFECTIVENESS: EXPERIENCE FROM NIGERIA
- Author
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Yusuf Abubakar Abiola
- Published
- 2021
47. Terörizmle Mücadelede Sivil Toplum Kuruluşların Rolü: Nijerya ve Tunus Karşılaştırması
- Author
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Yusuf Abubakar Wara
- Subjects
Political science ,General Medicine - Abstract
Civil Society Organizations (CSOs) otherwise known as the “third sector” have become gargantuan tools for societal peace, progress and stability. Through collaborations and alliances, they are able to intervene in resolving critical problems affecting a given community especially where government’s hand could not have reached. One of the areas where Civil Society takes a bold step in modern society is fighting terrorism. They help in eradicating the menace of terrorism through awareness, damnation, motivation, appraise, rehabilitation, partnership, indoctrination and co-ordinational approaches. Thus, the objective of this paper is to adopt functional approach to critically compare the roles of CSOs in fighting terrorism between Nigeria and Tunisia. The article place more emphasis on content analysis to tests the hypothesis that a country with vibrant CSOs is more likely to eradicate terrorism than the one that has not. The article also responds to question that: how effective are the CSOs’ anti-terrorism policies in the two countries? This research found out that even though Tunisia has more coordinated CSOs than Nigeria, the roles of the CSOs in both countries is not significant enough to help in getting rid of terrorism. So, there is need of more practical approach such as mediation, espionage or infiltration which this research recommends to the global Civil Societies.
- Published
- 2020
48. Improved model predictive load frequency control of interconnected power system with synchronized automatic generation control loops
- Author
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Yusuf Abubakar Sha’aban, Y. Jibril, Abdullahi Bala Kunya, and Mehmet Argin
- Subjects
0209 industrial biotechnology ,Automatic Generation Control ,020209 energy ,Automatic frequency control ,Pharmaceutical Science ,Medicine (miscellaneous) ,02 engineering and technology ,Standard deviation ,Automatic voltage regulator ,Electric power system ,020901 industrial engineering & automation ,Control theory ,Approximation error ,Robustness (computer science) ,0202 electrical engineering, electronic engineering, information engineering ,Model predictive control ,lcsh:Science ,Mathematics ,lcsh:R5-920 ,Load frequency control ,Optimal control ,Agricultural and Biological Sciences (miscellaneous) ,Area control error ,Control area ,lcsh:Q ,Voltage regulation ,lcsh:Medicine (General) - Abstract
Background Automatic generation control (AGC) of multi-area interconnected power system (IPS) is often designed with negligible cross-coupling between the load frequency control (LFC) and automatic voltage regulation (AVR) loops. This is because the AVR loop is considerably faster than that of LFC. However, with the introduction of slow optimal control action on the AVR, positive damping effect can be achieved on the LFC loop thereby improving the frequency control. In this paper, LFC synchronized with AVR in three-area IPS is proposed. Model predictive controller (MPC) configured in a dense distributed pattern, due to its online set-point tacking is used as the supplementary controller. The dynamics of the IPS subjected to multi-area step and random load disturbances are studied. The efficacy of the developed scheme is ascertained by simulating the disturbed system in MATLAB/Simulink. Results Based on the comparative analysis on the system responses, it is established that by cross-coupling the LFC loop with AVR, reductions of 66.45% and 59.09% in the frequency and tie-line power maximum deviations respectively are observed, while the respective settling times are found to be reduced by 29.68% and 22.77% when compared with the uncoordinated control scheme. In addition, the standard deviation and variance of the integral time absolute error of the system’s responses have reduced by 23.21% and 20.83% respectively compared to those obtained in a similar study. Conclusions The reduction in the maximum deviations and settling times in the system states indicates that introducing the voltage control via AVR loop has improved the frequency control significantly. While the lower standard deviation and variance of the integral time absolute error signify improvement in the robustness of the developed algorithm. However, this improvement is at the detriment of the controller size and computational complexity. In the uncoordinated control scheme, the control vector is one-dimensional, while in the coordinated scheme, the control vector is two-dimensional for each CA.
- Published
- 2020
49. Free-living Bacterial Community, Abundance and Edaphic Factors Response to Soil Depth Gradient under Contrasting Fertilization in Sugarcane Continuous Cropping Field
- Author
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Hua Zhang, Nyumah Fallah, Muhammad Tayyab, Ziqi Yang, Ziqin Pang, Caifang Zhang, Zhaoli Lin, Lahand James Stewart, Mbuya Sylvain Ntambo, Ahmad Yusuf Abubakar, and Wenxiong Lin
- Abstract
Although the effects of fertilization on soil N-fixing bacterial community and abundance have been investigated extensively in the surface soil (0–20 cm), the response of free-living bacterial community and abundance under contrasting fertilizations in a consecutive sugarcane monoculture field and their relationship with edaphic factors in the dipper (20–60 cm) soil layer remain elusive. In the current study, nifH gene amplicon sequencing was used to investigate N2-fixers bacterial community and abundance by leveraging high-throughput sequencing (HTS). Moreover, edaphic factors in three soil depths (0–20, 20–40 and 40–60 cm) under control (CK), organic matter (OM), biochar (BC) and filter mud (FM) amended soils were investigated. Our analysis revealed that β-glucosidase and phosphatase activities, and ammonium (NH4+-N), nitrate (NO3−-N), total carbon (TC), total nitrogen (TN) and available potassium (AK) were considerably higher in 0–20 cm in all treatments. Proteobacteria and Geobacter were dominant in all the samples, while 0–20 cm was overwhelmingly occupied by Anabaena, Enterobacter and Desulfovibrio in BC and FM amended soils, followed by Methylomonas in 20–40 cm under BC treatment. We also noticed that soil depth was the main environmental gradient that influenced soil diazotrophs and edaphic factors rather than fertilization. Together, these results suggest that soil depth had a profound impact on N-fixing bacteria, edaphic factors than fertilization regimes. Moreover, these findings were more pronounced in 0–20 cm soil depth under organic amendments compared with CK.
- Published
- 2022
50. Assessment of ICT Skills Application of Teacher Educators in Kwara State Colleges of Education, Nigeria
- Author
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Oluwatoyin, Fashiku Christopher, Abiola, Yusuf Abubakar, Francis, Olowo Busuyi, Oba Baba, Ayoku, Comfort, Fashiku Bunmi, Oluwatoyin, Fashiku Christopher, Abiola, Yusuf Abubakar, Francis, Olowo Busuyi, Oba Baba, Ayoku, and Comfort, Fashiku Bunmi
- Abstract
The study was carried out to assess the Information and Communication Technology (ICT) skills application of teacher educators in Kwara State Colleges of Education, Nigeria. The descriptive survey research design was adopted; the population of the study comprised 430 lecturers from Kwara State Colleges of Education Oro, Lafiagi, and Ilorin, respectively. A proportional sampling technique was used to select 160 respondents from the two teacher educator institutions. A simple random sampling technique was used in selecting 60 respondents from Oro College of Education and 100 respondents from Kwara State College of Education Ilorin. One self-designed questionnaire titled ‘Assessment of ICT Competency Skills of Lecturers’ (AICTCSL) with four points Liker scale was used to elicit information from the respondents. The instrument was validated. Its reliability was ensured at .78. Total Average Weighted Response (TAWR), and percentage and frequency counts were used in analyzing the collected data for the raised research questions at .05 levels of significance, while z-test statistics were used in addressing the formulated hypotheses. It was discovered in the study that lecturers in the used institutions were competent in manipulating the computer keyboard and connecting to the internet but were not competent in accessing the information on CD, organizing electronic files into folders, use of application software, use of PowerPoint, word excel and blog website. Also, no significant difference was established between the mean scores of lecturers in Kwara State Colleges of education Oro and Ilorin on their ICT skills acquisition and use, while there was a significant difference in the mean ratings of teacher educators from Oro and Ilorin on their use of application software competency. It was therefore recommended that government should make it a matter of policy that all lecturers in the institutions are ICT literate and it should be a prerequisite for their promotion and rec
- Published
- 2022
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