Petroleum-based plastics (PBP) with different properties have been developed to suit various need... more Petroleum-based plastics (PBP) with different properties have been developed to suit various needs of modern lives. Nevertheless, these well-developed properties also present the double-edged sword effect that significantly threatens the sustainability of the environment. This work focuses on the impact of microbial cultivating conditions (the elementary compositions and temperature) to provide insightful information for the process optimization of microbial degradation. The major elementary compositions in cultivation media and temperature from the literature were radically reviewed and assessed using the constructed supervised machine learning algorithm. Fifty-two literatures were collected as a training dataset to investigate the impact of major chemical elements and cultivation temperature upon PBP biodegradation. Among six singular parameters (NH4+, K+, PO43-, Mg2+, Ca2+, and temperature) and thirty corresponding binary parameters, four singular (NH4+, K+, PO43-, and Mg2+) and six binary parameters (NH4+/K+, NH4+/PO43-, NH4+/Ca2+, K+/PO43-, PO43-/Mg2+, Mg2+/Temp) were identified as statistically significant towards microbial degradation through analysis of variance (ANOVA). The binary effect (PO43-/Mg2+) is found to be the most statistically significant towards the microbial degradation of PBP. The concentration range, which locates at 0.1-0.6 g/L for Mg2+ and 0-2.8 g/L for PO43-, was identified to contribute to the maximum PBP biodegradation. Among all the investigated elements, Mg2+ is the only element that is statistically and significantly associated with the variations of cultivation temperature. The optimal preparation conditions within ± 20% uncertainties based upon the range of collected literature reports are recommended. Five representative cultivation elementary compositions (NH4+, K+, PO43-, Mg2+, and Ca2+) and temperature were reviewed from fifty two different literature reports to investigate their impacts on the microbial degradation of PBP using supervised machine learning algorithm. The optimal cultivation conditions based upon collected literature reports to achieve biodegradation over 80% were identified.
A theoretical simulation is used to estimate the impact of oscillator strength on Silicon nanocry... more A theoretical simulation is used to estimate the impact of oscillator strength on Silicon nanocrystals (SiNCs) using Matlab program. The Photoluminescence intensity oscillator dependence as well as Oscillator strength as a function of energy band gap and photon energy is studied. The results obtained, shows that oscillator strength of SiNCs behavior is in compliance with the quantum confinement effects which in succession determine the optical properties of SiNCs, and also shows that the oscillator strength in Nano-Crystallites varies with the amount of confinement and also with the surrounding environment due to change in dielectric constant. The models used in this work can be applied to other nanocrystals semiconductor materials
The current hydrogen generation technologies, especially biomass gasification using fluidized bed... more The current hydrogen generation technologies, especially biomass gasification using fluidized bed reactors (FBRs), were rigorously reviewed. There are involute operational parameters in a fluidized bed gasifier that determine the anticipated outcomes for hydrogen production purposes. However, limited reviews are present that link these parametric conditions with the corresponding performances based on experimental data collection. Using the constructed artificial neural networks (ANNs) as the supervised machine learning algorithm for data training, the operational parameters from 52 literature reports were utilized to perform both the qualitative and quantitative assessments of the performance, such as the hydrogen yield (HY), hydrogen content (HC) and carbon conversion efficiency (CCE). Seven types of operational parameters, including the steam-to-biomass ratio (SBR), equivalent ratio (ER), temperature, particle size of the feedstock, residence time, lower heating value (LHV) and c...
Spatial mapping of potential geothermal areas is an effective tool for a preliminary investigatio... more Spatial mapping of potential geothermal areas is an effective tool for a preliminary investigation and the development of a clean and renewable energy source around the globe. Specific locations within the Earth’s crust display some manifestations of sub-surface geothermal occurrences, such as hot springs, a volcanic plug, mud volcanoes, and hydrothermal alterations, that need to be investigated further. The present area of investigations also reveals some of these manifestations. However, no attempt was made to examine the prospectivity of this terrain using the efficient GIS-based multicriteria evaluation (MCE) within the scope of the Analytic hierarchy process (AHP). The integration of remote sensing, Geographic information system (GIS), and other geophysical methods (Magnetic and gravity) was performed to map the promising geothermal areas. Multiple input data sets such as aero-magnetic, aero-gravity, aero-radiometric, digital elevation model (DEM), geological map, and Landsat-8...
This study examines the determinant of dividend payout in the Nigerian banking industry over the ... more This study examines the determinant of dividend payout in the Nigerian banking industry over the period 2004-2013. The study used five sample banks out of fourteen banks quoted on the floor of the Nigerian stock Exchange as at December 2012. Secondary data were used for the research work and the data were obtained from Nigerian Stock Exchange (NSE) fact book 2011/2012. The variables used were dividend payout, profitability, liquidity, Size and financial leverage. The data collected was analyzed using multiple regression and Pearson correlation. The finding revealed that profitability, liquidity, size and leverage proved to be the determinant of dividend payout of banks in Nigeria, while liquidity and profitability are the most critical factors determining dividend payout of banks in Nigeria. It is recommended that Banks should try all their best in improving their liquidity position since it has greater influence.
Recently, the Nigerian Geological Survey Agency (NGSA) acquired high resolution airborne data ove... more Recently, the Nigerian Geological Survey Agency (NGSA) acquired high resolution airborne data over Nigeria and have commenced surface geological mapping in some parts of the country. This research becomes imperative taking into account time consumption and the risk associated with geological field mapping in recent time which includes difficulty in terrain coverage, abduction of field workers and insurgency in some part of the country. In this research an attempt was made to carry out litho-magnetic mapping and delineation of surface structures from interpretation of high resolution aeromagnetic data within northern Bida basin and environs. High resolution aeromagnetic data of the study area was subjected to regional residual separation, analytical signal, vertical derivative, tilt angle derivative, horizontal tilt derivative and upward continuation filters in the Oasis Montaj Version 7.0.1 Geo-software environment to enhance data for interpretation. Results from the total magneti...
Catalytic oxidation is a promising approach to eliminating formaldehyde (HCHO) to improve indoor ... more Catalytic oxidation is a promising approach to eliminating formaldehyde (HCHO) to improve indoor air quality. Herein, CeO2 was explored due to its remarkable properties for oxygen storage and oxygen transfer capability for co-doping δ-MnO2 alongside cobalt for enhanced low-temperature oxidation of HCHO. Various characterization techniques were deployed to understand the morphology and physicochemical properties of the synthesized catalysts. The Co-Ce co-doped catalysts with low CeO2 loading (0.05 and 0.1) showed higher catalytic activity for HCHO oxidation due to their higher concentration of surface-active oxygen species. Catalytic oxidation results showed that the presence of CeO2 leads to the generation of methanol as a secondary hazardous pollutant. Methanol selectivity increases with increasing CeO2 loading in the catalysts. The results from in-situ DRIFTS confirmed the formation of methoxy species in the presence of CeO2, which are intermediates for methanol generation. Considering the recent interest in CeO2 as a potential catalyst for practical abatement of HCHO from the indoor environment, this work has thus raised questions on the safety of using CeO2 as a catalytic material for HCHO oxidation. It also provides insights into the surface reaction mechanism leading to the generation of methanol in the presence of CeO2.
Environmental Science and Pollution Research, 2021
Toluene is one of the pollutants that are dangerous to the environment and human health and has b... more Toluene is one of the pollutants that are dangerous to the environment and human health and has been sorted into priority pollutants; hence, the control of its emission is necessary. Due to severe problems caused by toluene, different techniques for the abatement of toluene have been developed. Catalytic oxidation is one of the promising methods and effective technologies for toluene degradation as it oxidizes it to CO2 and does not deliver other pollutants to the environment. This paper highlights the recent progressive advancement of the catalysts for toluene oxidation. Five categories of catalysts, including noble metal catalysts, transition metal catalysts, perovskite catalysts, metal-organic frameworks (MOFs)-based catalysts, and spinel catalysts reported in the past half a decade (2015–2020), are reviewed. Various factors that influence their catalytic activities, such as morphology and structure, preparation methods, specific surface area, relative humidity, and coke formation, are discussed. Furthermore, the reaction mechanisms and kinetics for catalytic oxidation of toluene are also discussed.
Abstract A new model by incorporating the porosity field during acetylene pretreatment (PT) into ... more Abstract A new model by incorporating the porosity field during acetylene pretreatment (PT) into the Fischer-Trospch (FT) synthesis comprehensive kinetic is proposed for quantitatively describing the product distributions using a mesoporous silica supported Co-Ni bimetallic catalyst. Coupling the quasi-homogeneous medium model with the acetylene reaction kinetics via the Langmuir-Hinshelwood-Hougen-Watson (LHHW) approach, the model yields good predictions for breakthrough curves, pressure drops, and permeability during PT process. The active carbidic intermediates formed by the acetylene PT engaged with the subsequent CO dissociation and 1-olefin re-adsorption associated secondary reactions during FT synthesis. The constructed comprehensive kinetic model can predict the olefin to paraffin ratios (OPR) versus chain length when the catalyst was pretreated. A relatively good prediction from chain length dependent model (CLD) indicates the validity of assuming that Van Waals forces play a critical role during olefin re-adsorption in the secondary reactions for chain propagations once the mesoporous supported Co-Ni bimetallic catalyst was pretreated by acetylene. The proposed model successfully bridges the gaps between the PT and FT process at the investigated experimental conditions.
The COVID-19 pandemic received enormous media coverage from the very beginning when it was first ... more The COVID-19 pandemic received enormous media coverage from the very beginning when it was first noticed in Wahan, China in December 2019. The media system which was usually defined by existing state political system radically changed during the COVID-19 period due to the rise of digital media. A new media system emerged with robust communicative power. The paper used secondary data (document analysis) to descriptively analyzed issues that arose from media systems coverage of the COVID-19 pandemic. These issues included emergence of a new media/medicine relations, the change in pattern of health news consumption and persistent public fear and panic. The paper recommended for a regulatory framework for telehealth service delivery, governments engagement of the public using social media platform and development of real-time alerts system for public health officials to respond quickly to misinformation during pandemics.
Petroleum-based plastics (PBP) with different properties have been developed to suit various need... more Petroleum-based plastics (PBP) with different properties have been developed to suit various needs of modern lives. Nevertheless, these well-developed properties also present the double-edged sword effect that significantly threatens the sustainability of the environment. This work focuses on the impact of microbial cultivating conditions (the elementary compositions and temperature) to provide insightful information for the process optimization of microbial degradation. The major elementary compositions in cultivation media and temperature from the literature were radically reviewed and assessed using the constructed supervised machine learning algorithm. Fifty-two literatures were collected as a training dataset to investigate the impact of major chemical elements and cultivation temperature upon PBP biodegradation. Among six singular parameters (NH4+, K+, PO43-, Mg2+, Ca2+, and temperature) and thirty corresponding binary parameters, four singular (NH4+, K+, PO43-, and Mg2+) and six binary parameters (NH4+/K+, NH4+/PO43-, NH4+/Ca2+, K+/PO43-, PO43-/Mg2+, Mg2+/Temp) were identified as statistically significant towards microbial degradation through analysis of variance (ANOVA). The binary effect (PO43-/Mg2+) is found to be the most statistically significant towards the microbial degradation of PBP. The concentration range, which locates at 0.1-0.6 g/L for Mg2+ and 0-2.8 g/L for PO43-, was identified to contribute to the maximum PBP biodegradation. Among all the investigated elements, Mg2+ is the only element that is statistically and significantly associated with the variations of cultivation temperature. The optimal preparation conditions within ± 20% uncertainties based upon the range of collected literature reports are recommended. Five representative cultivation elementary compositions (NH4+, K+, PO43-, Mg2+, and Ca2+) and temperature were reviewed from fifty two different literature reports to investigate their impacts on the microbial degradation of PBP using supervised machine learning algorithm. The optimal cultivation conditions based upon collected literature reports to achieve biodegradation over 80% were identified.
A theoretical simulation is used to estimate the impact of oscillator strength on Silicon nanocry... more A theoretical simulation is used to estimate the impact of oscillator strength on Silicon nanocrystals (SiNCs) using Matlab program. The Photoluminescence intensity oscillator dependence as well as Oscillator strength as a function of energy band gap and photon energy is studied. The results obtained, shows that oscillator strength of SiNCs behavior is in compliance with the quantum confinement effects which in succession determine the optical properties of SiNCs, and also shows that the oscillator strength in Nano-Crystallites varies with the amount of confinement and also with the surrounding environment due to change in dielectric constant. The models used in this work can be applied to other nanocrystals semiconductor materials
The current hydrogen generation technologies, especially biomass gasification using fluidized bed... more The current hydrogen generation technologies, especially biomass gasification using fluidized bed reactors (FBRs), were rigorously reviewed. There are involute operational parameters in a fluidized bed gasifier that determine the anticipated outcomes for hydrogen production purposes. However, limited reviews are present that link these parametric conditions with the corresponding performances based on experimental data collection. Using the constructed artificial neural networks (ANNs) as the supervised machine learning algorithm for data training, the operational parameters from 52 literature reports were utilized to perform both the qualitative and quantitative assessments of the performance, such as the hydrogen yield (HY), hydrogen content (HC) and carbon conversion efficiency (CCE). Seven types of operational parameters, including the steam-to-biomass ratio (SBR), equivalent ratio (ER), temperature, particle size of the feedstock, residence time, lower heating value (LHV) and c...
Spatial mapping of potential geothermal areas is an effective tool for a preliminary investigatio... more Spatial mapping of potential geothermal areas is an effective tool for a preliminary investigation and the development of a clean and renewable energy source around the globe. Specific locations within the Earth’s crust display some manifestations of sub-surface geothermal occurrences, such as hot springs, a volcanic plug, mud volcanoes, and hydrothermal alterations, that need to be investigated further. The present area of investigations also reveals some of these manifestations. However, no attempt was made to examine the prospectivity of this terrain using the efficient GIS-based multicriteria evaluation (MCE) within the scope of the Analytic hierarchy process (AHP). The integration of remote sensing, Geographic information system (GIS), and other geophysical methods (Magnetic and gravity) was performed to map the promising geothermal areas. Multiple input data sets such as aero-magnetic, aero-gravity, aero-radiometric, digital elevation model (DEM), geological map, and Landsat-8...
This study examines the determinant of dividend payout in the Nigerian banking industry over the ... more This study examines the determinant of dividend payout in the Nigerian banking industry over the period 2004-2013. The study used five sample banks out of fourteen banks quoted on the floor of the Nigerian stock Exchange as at December 2012. Secondary data were used for the research work and the data were obtained from Nigerian Stock Exchange (NSE) fact book 2011/2012. The variables used were dividend payout, profitability, liquidity, Size and financial leverage. The data collected was analyzed using multiple regression and Pearson correlation. The finding revealed that profitability, liquidity, size and leverage proved to be the determinant of dividend payout of banks in Nigeria, while liquidity and profitability are the most critical factors determining dividend payout of banks in Nigeria. It is recommended that Banks should try all their best in improving their liquidity position since it has greater influence.
Recently, the Nigerian Geological Survey Agency (NGSA) acquired high resolution airborne data ove... more Recently, the Nigerian Geological Survey Agency (NGSA) acquired high resolution airborne data over Nigeria and have commenced surface geological mapping in some parts of the country. This research becomes imperative taking into account time consumption and the risk associated with geological field mapping in recent time which includes difficulty in terrain coverage, abduction of field workers and insurgency in some part of the country. In this research an attempt was made to carry out litho-magnetic mapping and delineation of surface structures from interpretation of high resolution aeromagnetic data within northern Bida basin and environs. High resolution aeromagnetic data of the study area was subjected to regional residual separation, analytical signal, vertical derivative, tilt angle derivative, horizontal tilt derivative and upward continuation filters in the Oasis Montaj Version 7.0.1 Geo-software environment to enhance data for interpretation. Results from the total magneti...
Catalytic oxidation is a promising approach to eliminating formaldehyde (HCHO) to improve indoor ... more Catalytic oxidation is a promising approach to eliminating formaldehyde (HCHO) to improve indoor air quality. Herein, CeO2 was explored due to its remarkable properties for oxygen storage and oxygen transfer capability for co-doping δ-MnO2 alongside cobalt for enhanced low-temperature oxidation of HCHO. Various characterization techniques were deployed to understand the morphology and physicochemical properties of the synthesized catalysts. The Co-Ce co-doped catalysts with low CeO2 loading (0.05 and 0.1) showed higher catalytic activity for HCHO oxidation due to their higher concentration of surface-active oxygen species. Catalytic oxidation results showed that the presence of CeO2 leads to the generation of methanol as a secondary hazardous pollutant. Methanol selectivity increases with increasing CeO2 loading in the catalysts. The results from in-situ DRIFTS confirmed the formation of methoxy species in the presence of CeO2, which are intermediates for methanol generation. Considering the recent interest in CeO2 as a potential catalyst for practical abatement of HCHO from the indoor environment, this work has thus raised questions on the safety of using CeO2 as a catalytic material for HCHO oxidation. It also provides insights into the surface reaction mechanism leading to the generation of methanol in the presence of CeO2.
Environmental Science and Pollution Research, 2021
Toluene is one of the pollutants that are dangerous to the environment and human health and has b... more Toluene is one of the pollutants that are dangerous to the environment and human health and has been sorted into priority pollutants; hence, the control of its emission is necessary. Due to severe problems caused by toluene, different techniques for the abatement of toluene have been developed. Catalytic oxidation is one of the promising methods and effective technologies for toluene degradation as it oxidizes it to CO2 and does not deliver other pollutants to the environment. This paper highlights the recent progressive advancement of the catalysts for toluene oxidation. Five categories of catalysts, including noble metal catalysts, transition metal catalysts, perovskite catalysts, metal-organic frameworks (MOFs)-based catalysts, and spinel catalysts reported in the past half a decade (2015–2020), are reviewed. Various factors that influence their catalytic activities, such as morphology and structure, preparation methods, specific surface area, relative humidity, and coke formation, are discussed. Furthermore, the reaction mechanisms and kinetics for catalytic oxidation of toluene are also discussed.
Abstract A new model by incorporating the porosity field during acetylene pretreatment (PT) into ... more Abstract A new model by incorporating the porosity field during acetylene pretreatment (PT) into the Fischer-Trospch (FT) synthesis comprehensive kinetic is proposed for quantitatively describing the product distributions using a mesoporous silica supported Co-Ni bimetallic catalyst. Coupling the quasi-homogeneous medium model with the acetylene reaction kinetics via the Langmuir-Hinshelwood-Hougen-Watson (LHHW) approach, the model yields good predictions for breakthrough curves, pressure drops, and permeability during PT process. The active carbidic intermediates formed by the acetylene PT engaged with the subsequent CO dissociation and 1-olefin re-adsorption associated secondary reactions during FT synthesis. The constructed comprehensive kinetic model can predict the olefin to paraffin ratios (OPR) versus chain length when the catalyst was pretreated. A relatively good prediction from chain length dependent model (CLD) indicates the validity of assuming that Van Waals forces play a critical role during olefin re-adsorption in the secondary reactions for chain propagations once the mesoporous supported Co-Ni bimetallic catalyst was pretreated by acetylene. The proposed model successfully bridges the gaps between the PT and FT process at the investigated experimental conditions.
The COVID-19 pandemic received enormous media coverage from the very beginning when it was first ... more The COVID-19 pandemic received enormous media coverage from the very beginning when it was first noticed in Wahan, China in December 2019. The media system which was usually defined by existing state political system radically changed during the COVID-19 period due to the rise of digital media. A new media system emerged with robust communicative power. The paper used secondary data (document analysis) to descriptively analyzed issues that arose from media systems coverage of the COVID-19 pandemic. These issues included emergence of a new media/medicine relations, the change in pattern of health news consumption and persistent public fear and panic. The paper recommended for a regulatory framework for telehealth service delivery, governments engagement of the public using social media platform and development of real-time alerts system for public health officials to respond quickly to misinformation during pandemics.
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Papers by Abubakar Yusuf