Dauda Ibrahim - Academia.edu (original) (raw)

Papers by Dauda Ibrahim

Computer Aided Chemical Engineering

Applied Sciences

Sustainable biofuels are an important tool for the decarbonisation of transport. This is especial... more Sustainable biofuels are an important tool for the decarbonisation of transport. This is especially true in aviation, maritime, and heavy-duty sectors with limited short-term alternatives. Their use by conventional transport fleets requires few changes to the existing infrastructure and engines, and thus their integration can be smooth and relatively rapid. Provision of feedstock should comply with sustainability principles for (i) producing additional biomass without distorting food and feed markets and (ii) addressing challenges for ecosystem services, including biodiversity, and soil quality. This paper performs a meta-analysis of current research for low indirect land use change (ILUC) risk biomass crops for sustainable biofuels that benefited either from improved agricultural practices or from cultivation in unused, abandoned, or severely degraded land. Two categories of biomass crops are considered here: oil and lignocellulosic. The findings confirm that there are significant ...

Computer Aided Chemical Engineering, 2017

Abstract This paper introduces a novel optimization-based framework for the design of a crude oil... more Abstract This paper introduces a novel optimization-based framework for the design of a crude oil distillation unit. The approach presented integrates surrogate models based on artificial neural networks (ANN) with feasibility constraints generated using a support vector machine (SVM) in order to optimise the column configuration and its operating conditions. The SVM filters infeasible design options from the solution space of the design problem, which reduces the computational effort and ultimately improves the quality of the final solution. Rigorous process simulations are used to build the surrogate model, while pinch analysis is employed to determine the maximum heat recovery and minimum utility costs. The objective is to minimise the total annualized cost, which is optimised by combining a genetic algorithm with the surrogate model. The approach is illustrated in an industrially relevant case study.

Vaccines, 2021

Vaccination plays a key role in reducing morbidity and mortality caused by infectious diseases, i... more Vaccination plays a key role in reducing morbidity and mortality caused by infectious diseases, including the recent COVID-19 pandemic. However, a comprehensive approach that allows the planning of vaccination campaigns and the estimation of the resources required to deliver and administer COVID-19 vaccines is lacking. This work implements a new framework that supports the planning and delivery of vaccination campaigns. Firstly, the framework segments and priorities target populations, then estimates vaccination timeframe and workforce requirements, and lastly predicts logistics costs and facilitates the distribution of vaccines from manufacturing plants to vaccination centres. The outcomes from this study reveal the necessary resources required and their associated costs ahead of a vaccination campaign. Analysis of results shows that by integrating demand stratification, administration, and the supply chain, the synergy amongst these activities can be exploited to allow planning an...

Designing feasible and economically-viable organic Rankine cycle (ORC) systems for applications s... more Designing feasible and economically-viable organic Rankine cycle (ORC) systems for applications such as high-grade heat recovery from the exhaust gases (400-600 °C) of stationary internal combustion engines (ICEs) has two main challenges: (i) selecting and designing an appropriate expansion technology, amongst the other system components, and (ii) selecting the optimal working fluid, and operational system parameters. In this work, comprehensive component models are integrated into an ORC system model to evaluate the onand off-design performance of a 2.5-MWe ORC engine using either a reciprocatingpiston expander or a radial-inflow turbine. The performance of the reciprocating-piston expander is predicted using a dynamic lumped-mass model, and a one-dimensional model based on the mean-line method is used to predict the performance of the turbine. An initial working-fluid screening leads to R1233zd being selected for further consideration, given the minimal specific investment costs a...

2020 6th International Conference on Mechanical Engineering and Automation Science (ICMEAS), 2020

In this article a sandwich beam structure with honeycomb core filled of MRE (magnetorheological e... more In this article a sandwich beam structure with honeycomb core filled of MRE (magnetorheological elastomer) with different ratios of Elastomer and iron particles modeled in ANSYS is proposed. The simulation (resonance frequency, total deformation, equivalent stress and equivalent strain) results for structures with PLA (Polylactic acid) and ABS (Acrylonitrile butadiene styrene) honeycomb core were analyzed and compared for two different cases. The results showed that the resonance frequency of the structure decreased as the ratio of iron particles was increased for all the cases, this is due to the increase in stiffness of the structure due to higher ratio of iron particles. Secondly structure with ABS honeycomb core showed lower frequency and higher deformation than the structure with PLA honeycomb core.

The need for petroleum refineries to process different types of crude oil in order to maximise pr... more The need for petroleum refineries to process different types of crude oil in order to maximise profit margin and to meet demand for products, calls for flexibility in the design and optimisation of crude oil distillation systems comprising distillation units and the heat recovery network. Crude oil distillation is a complex, capital- and energy-intensive process. The large number of degrees of freedom (column structure and operating conditions) and complex interactions within the system make the design and optimisation of crude oil distillation system a highly challenging task. This work develops new methodologies for the design of crude oil distillation systems that process a single crude oil feedstock and multiple crude oil feedstocks. In this work, the crude oil distillation unit is modelled using a rigorous tray-by-tray model where the number of trays active in each section is also a design degree of freedom. The model is embedded in an optimisation framework, together with a he...

Science Trends, 2018

Recent decades have seen an ever-increasing interest in the utilization of renewable and sustaina... more Recent decades have seen an ever-increasing interest in the utilization of renewable and sustainable energy sources such as wind, solar, and biomass amongst other solutions, as well as in improving energy efficiency in the residential and commercial sectors through a wide variety of solutions

Chemical engineering transactions, 2017

Crude oil distillation systems, comprising distillation units and their associated heat recovery ... more Crude oil distillation systems, comprising distillation units and their associated heat recovery networks, are highly complex and integrated systems. Their function is to separate crude oil into several streams with different boiling ranges for downstream processing. In practice, these systems typically need to be operated efficiently, so that the value added by the separation units is maximized (e.g. by maximizing flows of the most valuable intermediate products while minimizing production costs). Process improvement projects typically seek to increase production and/or to reduce energy consumption in existing crude oil distillation systems. Recent developments in design and operational optimization of crude oil distillation systems apply surrogate models, together with stochastic optimization techniques, for column design or operational optimization. Column operation is highly constrained by the product specifications and, in existing columns, by physical limitations related to co...

Chemical Engineering Research and Design, 2021

Abstract This paper presents a new optimization-based approach for the design of flexible heat-in... more Abstract This paper presents a new optimization-based approach for the design of flexible heat-integrated crude oil distillation units that can process multiple crude oil feedstocks. In this work, the crude oil distillation unit is modeled based on artificial neural network and a support vector machine. The artificial neural network model predicts the performance of the distillation unit for a given crude oil feedstock. The inputs to the artificial neural network include the column structural variables and operating conditions, while the outputs are variables required to evaluate the column performance. The support vector machine classifier filters out infeasible design alternatives (i.e. designs that are unlikely to converge when simulated using a rigorous model) from the solution space. The artificial neural network models and support vector machines constructed for different crude oil feedstocks are integrated into a two-stage optimization framework in order to optimize the column structural variables and operating conditions. Pinch analysis is used to estimate minimum utility demand. An effective solution strategy that combines stochastic and deterministic optimization algorithms is applied to search for economically viable and flexible design alternatives that can operate over a given range of crude oil feedstocks while satisfying product quality specifications. The capabilities of the proposed approach is illustrated using an industrially-relevant case study.

Coatings, 2021

Liquid food packages consist of various polymers films, which are bonded together with Aluminum f... more Liquid food packages consist of various polymers films, which are bonded together with Aluminum foil (Al-foil) using adhesion or by direct heat. The main aim of this research was to define important material properties such as fracture toughness and some FE-simulation material model parameters such as damage initiation, damage evolution, and the adhesion between Al-foil and low-density polyethylene (LDPE) film. This investigation is based on both physical experiments and FE simulations in ABAQUS with and without initial cracks of different lengths for comparison purposes. The final FE model in ABAQUS was used to compare the numerical input parameters in an extensive study with the ambition to investigate the materials’ parameters in cases with or without adhesion between laminates. Finally, the relation between the theoretical and experimental results for Al-foil using linear elastic fracture mechanics and modified strip yield model were shown, and the fracture toughness was calcula...

Rapid global COVID-19 pandemic response by mass vaccination is currently limited by the rate of v... more Rapid global COVID-19 pandemic response by mass vaccination is currently limited by the rate of vaccine manufacturing. This study presents a techno-economic feasibility assessment and comparison of three vaccine production platform technologies deployed during the COVID-19 pandemic: (1) adenovirus-vectored (AVV) vaccines, (2) messenger RNA (mRNA) vaccines, and (3) the newer self-amplifying RNA (saRNA) vaccines. Besides assessing the baseline performance of the production process, the impact of key design and operational uncertainties on the productivity and cost performance of these vaccine platforms were also evaluated using variance-based global sensitivity analysis. Cost and resource requirement projections were also computed for manufacturing multi-billion vaccine doses for covering the current global demand shortage and for providing annual booster immunizations. This model-based assessment provides key insights to policymakers and vaccine manufacturers for risk analysis, asset...

Asia Proceedings of Social Sciences, 2020

The implementation of Technical Vocational Education and Training (TVET) curriculum requires some... more The implementation of Technical Vocational Education and Training (TVET) curriculum requires some level of government commitment because of it nature and important towards reducing unemployment. Technical vocational education is a skill acquisition intervention programs that target about learning wisdom which would make people appropriate and productive in designated areas of economic and technological activities. In order to meet the demand of this 21st century implementation of technical vocational education curriculum in Nigeria must in totality be overhauled by ensuring that what is needed to achieve its goal is put in place for positive outcome. This paper discusses the concept of technical vocational education and training and it’s important towards job creation, the nature of technical vocational education curriculum in technical vocational education institutions, technical vocational education curriculum implementation and the impediments of Technical vocational education c...

Archives of Business Research, 2019

This paper examined the intervening variables affecting the mobilization of savings of Staff owne... more This paper examined the intervening variables affecting the mobilization of savings of Staff owned Cooperative Societies in Nasarawa State Public Institutions and their effects on the savings mobilization. It was a survey research that focused on the Naspoly Staff Cooperative Society, Nasarawa State Polytechnic Lafia, Nasarawa State Nigeria. Questionnaire was administered to a randomly sampled 250 members from the 380 registered members as at December 2018, with the view to confirming that the following variables (family size, income level, number of children in school and market situation) affects savings mobilization of staff owned cooperative societies in public institutions in Nasarawa State. Data collected were analyzed using descriptive statistics and The Pearson Product Moment Correlation. Findings from results of the study showed that, the identified variables intervenes in savings activities of staff members, it actually hampered the society’s efforts in mobilizing savings...

ASIAN TEFL Journal of Language Teaching and Applied Linguistics, 2019

Phonological development refers to the stages that children pass before they can correctly use an... more Phonological development refers to the stages that children pass before they can correctly use and understand the sound system of their language. Inspired by Stampe’s (1969) Natural Phonology Theory, this paper examines the acquisition of Hausa secondary consonants pronunciation by the Hausa children. The paper seeks to achieve the following objectives (a) to identify the phonological processes that are operating in the production of the Hausa secondary consonants by the Hausa 2-5 years children (b) to discover the units that are more affected if certain changes occur in the production of the Hausa secondary consonants (c) to explain whether a parental behavior influence the children’s production of the Hausa secondary consonants. Four children aged between 2-5 years were purposely selected. The data were collected using a Pictorial Stimulus-Driven Elicitation. The study found that reduction, simplification, and substitution phonological processes operate in some of the children’s s...

Industrial & Engineering Chemistry Research, 2017

The complex nature of crude oil distillation units, including their interactions with the associa... more The complex nature of crude oil distillation units, including their interactions with the associated heat recovery network and the large number of degrees of freedom, makes their optimization a very challenging task. We address here the design of a complex crude oil distillation unit by integrating rigorous tray-by-tray column simulation using commercial process simulation software with an optimization algorithm. While several approaches were proposed to tackle this problem, most of them relied on simplified models that are unable to deal with the whole complexity of the problem. The design problem is herein formulated to consider both structural variables (the number of trays in each column section) and operational variables (feed inlet temperature, pump-around duties and temperature drops, stripping steam flow rates and reflux ratio). A simulation-optimization approach for designing such a complex system is applied, which searches for the best design while accounting for heat recovery opportunities using pinch analysis. The approach is illustrated by its application to a specific distillation unit, in which numerical results demonstrate that the new approach is capable of identifying appealing design options while accounting for industrially relevant constraints.

Education and Information Technologies, 2017

remarkably there have been no single study documented on its use by academic staff in the univers... more remarkably there have been no single study documented on its use by academic staff in the university. In the light of this, this study assesses the use of electronic resources by academic staff at the University of Ilorin. Simple random sampling technique was used to select the respondents that took part in the study. Questionnaire was used to gather data. Descriptive analyses including percentage and frequency count were used to analyze the data. Of the 847 academic staff at the University of Ilorin, 184 academic staff was taken to represent the sample for the study. Five research questions were developed and answered by the study. The results demonstrate that majority of the academic staff use e-resource for research, curriculum development and self educational development. The study also revealed that search engines and private subscription are the most avenue use to access electronic information. Use of e-resources by academic staff is reported to be hindered by slow Internet service, lack of constant power supply, low availability of e-resources, and inadequate online access. The study concluded that electronic resources usually provide opportunity of getting current and up-to-date data/information, but this invaluable information sources have not been fully utilized by these academic staff. Based on the conclusion, the study recommends that the Internet facilities at the university should be Educ Inf Technol

Mediterranean Journal of Social Sciences, 2013

In the recent times, the Republic of Mali has been striving to restore peace and harmony in the s... more In the recent times, the Republic of Mali has been striving to restore peace and harmony in the state. The conflict initiated by insurgent Islamist groups fighting against the Malian government for independence in northern Mali. The revolt against the government is associated with the implementation of shariah laws. Despite the current decrepit political condition in Mali it seems to be a site of attraction of Western military intervention. This paper studies the role of religion and natural resources in the conflict. Mali is one of the poorest countries in the world but in reserve it has one of the largest amounts of mineral deposits including uranium and other energy related resources. The significance of this paper is that it critically analyses the legality, motives and purpose of French intervention in Malian conflict and direct US support for it.

African Journal of Traditional, Complementary and Alternative Medicines, 2010