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Article
Publication date: 5 December 2016

David O. Obada, Muhammad Dauda, Fatai O. Anafi, Abdulkarim S. Ahmed and Olusegun A. Ajayi

A structural and textural characterization study has been performed to investigate the adherence of zeolite-based catalyst washcoated onto honey-comb-type cordierite…

Abstract

Purpose

A structural and textural characterization study has been performed to investigate the adherence of zeolite-based catalyst washcoated onto honey-comb-type cordierite monoliths. The supports were characterized by the scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDS), X-ray diffraction (XRD) and Brunauer–Emmett–Teller (BET) techniques.

Design/methodology/approach

SEM/EDS provided quantitative estimate of the washcoated monolith as the elemental composition of catalyst coating. The XRD pattern deduced that the zeolite-based catalysts were successfully mounted on the cordierite support, showing the characteristic peaks of zeolites (Zeolite Socony Mobil–5; ZSM-5) at Braggs angles of 7.88°, 8.76°, 23.04°, 23.88° and 24.36°, whereas the characteristic peak of cordierite is seen at a Braggs angle of 10.44°.

Findings

The BET results proved that a monolayer of zeolite may serve the need for surface area and porosity. This was evident in the increase of surface area of washcoated support as against the bare support. The obtained isotherms were of Type IV, illustrating the presence of mesopores. The adsorption and desorption isotherm branches coincided over the interval 0 < P/P0 < 0.50 and 0 < P/P0 < 0.45, showing N2 reversible adsorption for the two samples, respectively.

Originality/value

It was concluded that the composite materials which are ZSM-5 (Si/Al = 25) and precursors of the transition salts of copper, zinc and ceria powders were deposited on the catalyst supports, establishing the success of the coating procedure relative to the adherence of the catalyst compositions on the ceramic support.

Details

World Journal of Engineering, vol. 13 no. 6
Type: Research Article
ISSN: 1708-5284

Keywords

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Article
Publication date: 1 August 2016

David O. Obada, David Dodoo-Arhin, Muhammad Dauda, Fatai O. Anafi, Abdulkarim S. Ahmed, Olusegun A. Ajayi and Ibraheem A. Samotu

This work aims to analyze the effect of mechanical activation on structural disordering (amorphization) in an alumina-silica ceramics system and formation of mullite most…

Abstract

Purpose

This work aims to analyze the effect of mechanical activation on structural disordering (amorphization) in an alumina-silica ceramics system and formation of mullite most notably at a lower temperature using X-ray diffraction (XRD). Also, an objective of this work is to focus on a low-temperature fabrication route for the production of mullite powders.

Design/methodology/approach

A batch composition of kaolin, alumina and silica was manually pre-milled and then mechanically activated in a ball mill for 30 and 60 min. The activated samples were sintered at 1,150°C for a soaking period of 2 h. Mullite formation was characterized by XRD and scanning electron microscopy (SEM).

Findings

It was determined that the mechanical activation increased the quantity of the mullite phase. SEM results revealed that short milling times only helped in mixing of the precursor powders and caused partial agglomeration, while longer milling times, however, resulted in greater agglomeration.

Originality/value

It is noted that, a manual pre-milling of approximately 20 min and a ball milling approach of 60 min milling time can be suggested as the optimum milling time for the temperature decrease succeeded for the production of mullite from the specific stoichiometric batch formed.

Details

World Journal of Engineering, vol. 13 no. 4
Type: Research Article
ISSN: 1708-5284

Keywords

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Article
Publication date: 23 October 2015

Ibraheem A. Samotu, Fatai O. Anafi, Muhammad Dauda, Abdulkarim S. Ahmed, Raymond B. Bako and David O. Obada

The general-purpose engine lathe is the most basic turning machine tool. As with all lathes, the two basic requirements for turning are a means of holding the workpiece…

Abstract

The general-purpose engine lathe is the most basic turning machine tool. As with all lathes, the two basic requirements for turning are a means of holding the workpiece while it rotates as well as a means of holding cutting tools and moving them relatively to the workpiece. In this paper, we present the results of finite element analysis (FEA) performed to investigate nature of stress and their distribution at optimum point along the two turning tables of a micro-controller based versatile machine tool desktop learning module. Commercial Autodesk Inventor was used to create both three-dimensional (3D) and 2D models as well as performing simulation. Dynamics simulation generated the motion load expected to act on the tables when used for real-life operation which were in turn used to perform the FEA. The motion of the DC stepper motor driving the tables and other parts of the module is designed to be controlled by programmable chips. Before creating FEA simulation for the tables, numerical divergence were prevented by varying the mesh settings to obtain the settings at which the results of the analyses converges which was obtained at 0.03 average element size and 0.04 minimum element size. Finite element analysis carried out on the tables shows that aluminium alloy 4032-T6 chosen will serve in the fabrication of physical prototype. FEA revealed the nature and level of stresses that will be experienced on the tables, it also revealed region where these stresses will concentrate on them. The analysis also estimated the expected weight of the turning tables 1&2 to be 1.23536 and 0.257182 kg respectively and show that the minimum factor of safety was constantly 15 ul within the tables which means that they will not fail during operation.

Details

World Journal of Engineering, vol. 12 no. 5
Type: Research Article
ISSN: 1708-5284

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Article
Publication date: 26 July 2021

Abba Tahir Mahmud, Stephen O. Ogunlana and W.T. Hong

Extensive research towards identifying the attributable cost overrun factors globally has been conducted predominantly from a survey-oriented perspective, which disregard…

Abstract

Purpose

Extensive research towards identifying the attributable cost overrun factors globally has been conducted predominantly from a survey-oriented perspective, which disregard the contextual basis on which these triggers manifest. This study aims to explore the driving factors of cost overrun in highway projects, specific to the Nigerian context.

Design/methodology/approach

The research used a context-based approach to seek project stakeholders’ perspectives on the key drivers of cost overrun in highway projects in Nigerian. Semi-structured interviews were conducted with client, contractor and consultant organisations involved in the provision of highway infrastructure projects in Nigeria. The collected data was analysed using a developed coding framework grounded on a case study approach, principles of inductive thematic analysis and saliency analysis to identify the key drivers.

Findings

Findings from the analysis identified triggers from macroeconomic, societal, leadership and project management perspectives with synergistic relationships with each other based on prevalence and significance. Among the key triggers is a delay in work progress, political instability, adverse weather, social issues, delay in progress payment to contractors and modification of project scope. In conclusion, the triggers of cost overrun in highway projects are contextually driven by the complex nature of the project management, societal, macroeconomic and leadership triggers specific to the Nigerian context.

Research limitations/implications

The research was limited to only highway infrastructure projects in Nigeria. Furthermore, the findings are based on a small sample size, and thus, caution must be taken before applying the outcome of this study in a generalised way to other contexts.

Practical implications

Practically, the stakeholders i.e. client, contractors and consultants should acknowledge the contextual circumstances in which each of the triggers takes place, which will aid in developing pragmatic measures and make the right decisions towards addressing these triggers during any highway construction project in Nigeria and enhance the chances of project success.

Originality/value

The context-based approach applied in this study is expected to provide a new insight in understanding the triggers of cost overruns, especially in highway projects in Nigeria and indeed other developing countries with similar governance characteristics

Details

Journal of Engineering, Design and Technology , vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1726-0531

Keywords

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Article
Publication date: 29 October 2019

Umar Habibu Umar, Muhammad Bilyaminu Ado and Habibu Ayuba

The purpose of this study is to establish whether religion (interest) is an impediment to Nigeria’s financial inclusion targets to be achieved by the year 2020.

Abstract

Purpose

The purpose of this study is to establish whether religion (interest) is an impediment to Nigeria’s financial inclusion targets to be achieved by the year 2020.

Design/methodology/approach

The data were collected through semi-structured interviews and documentary evidence. Thematic analysis was used to analyze the interview responses.

Findings

It was found that all the Central Bank of Nigeria (CBN) programs that contribute toward achieving financial inclusion are interest-based ones. Further, none of them provides a non-interest window except Commercial Agricultural Credit Schemes (CACS). Even the CACS is not fully Shari’a-compliant, as it requires further modification. Despite the fact that interest is condemned in Islam, a majority of Muslims have been found to be accessing interest-based funds. Hence, interest is not a factor that hinders the achievement of reducing Nigeria’s financial exclusion rate to 20 per cent by the year 2020.

Research limitations/implications

This study inquired into the programs under the Development Finance Department of the CBN by using semi-structured interviews and documentary evidence. Other programs of the federal government, state governments, NGOs and other private organizations and individuals are not considered. The findings have pointed out the areas to conduct future studies on religion and financial inclusion.

Practical implications

Although Muslims who complained about interest are a minority, there is the need to provide non-interest windows in the programs before they start shunning these programs, as a lot influential Muslim scholars are currently preaching against the interest.

Originality/value

The paper is one of the few studies that support the view that interest does not hinder the achievement of financial inclusion in a Muslim majority country.

Details

Qualitative Research in Financial Markets, vol. 12 no. 3
Type: Research Article
ISSN: 1755-4179

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Article
Publication date: 28 June 2021

Abdurrahman Abdullahi, Anwar Hasan Abdullah Othman and Salina Kassim

This paper aims to examine the determinants of intention to adopt Islamic microfinance among prospective customers in Nigeria, to enhance access to formal financial services.

Abstract

Purpose

This paper aims to examine the determinants of intention to adopt Islamic microfinance among prospective customers in Nigeria, to enhance access to formal financial services.

Design/methodology/approach

The quantitative study used the proportionate stratified random sampling technique to collect data from 450 respondents, using close-ended questionnaires. The data was analyzed using analysis of moment structures-structural equation modeling. The decomposed theory of planned behavior (DTPB) was used as the underlying theory to test 10 hypotheses.

Findings

Results showed the intention toward the adoption of Islamic microfinance is high in Nigeria. In total, 8 of the 10 study hypotheses were supported, out of which attitude, subjective norm and perceived behavioral control were found to have a positive and significant influence on the behavioral intention to adopt Islamic microfinance. Consequently, the study recommends the need for stakeholders in the Nigerian financial system to embark on enlightenment campaigns that will improve the public attitude on the role of Islamic microfinance banks in the promotion of financial inclusion and poverty reduction.

Research limitations/implications

The study focused specifically on three selected states in Northern Nigeria that are predominantly Muslim. The findings and indeed the conclusions of the study, may not be suitable for generalization to other parts of the country.

Practical implications

The study found that three constructs: attitude, subjective norms and perceived behavioral control were found to affect behavioral intention. Thus, the Central Bank of Nigeria and Islamic financial institutions should tailor their enlightenment campaigns toward improving public attitude on the need to adopt Islamic microfinance banks to further enhance financial inclusion, and thus reduce the incidence of poverty. Islamic microfinance banks should complement their commercial products and services with Islamic social finance products such as Sadaqat, Zakat and benevolent loan, as is the practice in jurisdictions where Islamic finance is institutionalized.

Social implications

The social implication of the study is its ability to determine factors that will enhance financial inclusion in Nigeria. This will assist in reducing poverty and income inequality.

Originality/value

The study was also able to extend the DTPB by introducing awareness as an additional latent construct in explaining attitude.

Details

International Journal of Ethics and Systems, vol. 37 no. 3
Type: Research Article
ISSN: 2514-9369

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Article
Publication date: 8 May 2017

Shing Chuan Lee, Noreffendy Tamaldin and Mohd Fadzli Bin Abdollah

This paper aims to investigate the tribological performance of the decanter cake feedstock biodiesel which was blended in 5 and 10 per cent volume with petroleum diesel.

Abstract

Purpose

This paper aims to investigate the tribological performance of the decanter cake feedstock biodiesel which was blended in 5 and 10 per cent volume with petroleum diesel.

Design/methodology/approach

The tribological performance of the decanter cake biodiesel was tested using the modified ASTM D4172 standard with temperature range from 300°C to 750°C and load range from 392 to 981 N while spindle speed is at 1,200 rpm.

Findings

At 5 per cent volume of biodiesel, friction reduced ranging from 10 to 45 per cent at all temperature and load ranges, whereas specific wear rate reduced ranging from 22 to 29 per cent at low load and 4 per cent to 15 per cent at high load for all temperature ranges. Addition up to 10 per cent volume of biodiesel reduced friction ranging from 10 to 35 per cent at all temperature and load ranges, whereas specific wear rate reduced ranging from 15 to 29 per cent only at low load for all temperature ranges.

Practical implications

The standardised test may not represent the actual condition of a real running diesel engine.

Originality/value

Because the lubricity of biodiesel was difficult to determine in a real running engine, this paper provided a standardised test for simplification.

Details

Industrial Lubrication and Tribology, vol. 69 no. 3
Type: Research Article
ISSN: 0036-8792

Keywords

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Article
Publication date: 13 July 2018

Waliu Olawale Shittu, Sallahuddin Hassan and Muhammad Atif Nawaz

The purpose of this paper is to examine the impact of external debt and corruption on economic growth in the selected five Sub-Saharan African (SSA) countries, from 1990 to 2015.

Abstract

Purpose

The purpose of this paper is to examine the impact of external debt and corruption on economic growth in the selected five Sub-Saharan African (SSA) countries, from 1990 to 2015.

Design/methodology/approach

Panel unit root and panel cointegration tests are employed to test for stationarity of the series and the long-run relationship, respectively. Fully modified OLS and dynamic OLS techniques are also employed to examine the long-run coefficients of the variables of the model, as well as panel Granger causality test, in order to examine the direction of causality among the variables.

Findings

The results indicate that there is a negative relationship between external debt and economic growth, as well as a bi-directional causality between the two variables. The findings also indicate a positive relationship between corruption and economic growth, as well as a uni-directional causality running from economic growth through corruption.

Research limitations/implications

The study recommends that the governments of the selected countries should address the menace of rising external debt through the adoption of other sources of capital for investment. Such include more openness of the economy for more capital, by easing restrictions on genuine imports and exports of valuable goods and services. It also suggests that the issue of corruption be tackled head-on, by such penalties that tend to make corruption less attractive.

Originality/value

While the relationship between economic growth and external debt, on the one hand, and corruption and economic growth, on the other hand, have received considerable attentions, the trio of external debt, corruption and economic growth have not been found combined in a model, to the best of the authors’ knowledge. Also, the countries under consideration, who jointly account for about 47 percent of the entire SSA countries’ stock of external debt, have not been jointly found in any recent panel studies involving the selected variables.

Details

African Journal of Economic and Management Studies, vol. 9 no. 3
Type: Research Article
ISSN: 2040-0705

Keywords

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Book part
Publication date: 1 March 2021

Siti Khomsatun, Hilda Rossieta, Fitriany Fitriany and Mustafa Edwin Nasution

The unique characteristic of Islamic bank leads in governance and disclosure. Using stakeholder, signaling, and market discipline theory, governance and adequate…

Abstract

The unique characteristic of Islamic bank leads in governance and disclosure. Using stakeholder, signaling, and market discipline theory, governance and adequate disclosure may increase bank soundness. This study aims to investigate the relationship of sharia disclosure and Sharia Supervisory Board in influencing Islamic bank soundness in the different regulatory framework of the country. Using purposive sampling, the research covered 84 Islamic banks in 16 countries during the period 2013–2015 with lag data of Islamic bank soundness. The result shows sharia disclosure influences on Islamic bank soundness for management efficiency, capital adequacy ratio, asset quality, and liquidity. The results also show that sharia disclosure mediates the indirect effect of SSB on Islamic bank soundness. The regulatory framework (sharia accounting standard and SSB regulation) shows moderating effect of regulation framework proved on the association of sharia disclosure with management efficiency, capital, and liquidity. The effect is indirectly depending on the regulatory framework for proxy management efficiency, capital, and liquidity. The implication of the research suggests that sharia disclosure could increase the market discipline mechanism of Islamic bank stream. The Islamic bank can increase the transparency using sharia disclosure as a branding for increasing public trust, even though in the deficient Islamic bank regulation countries.

Details

Recent Developments in Asian Economics International Symposia in Economic Theory and Econometrics
Type: Book
ISBN: 978-1-83867-359-8

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Article
Publication date: 8 January 2018

Muhammad Sabbir Rahman, Fadi Abdel Muniem Abdel Fattah, Mahmud Zaman and Hasliza Hassan

The purpose of this paper is to examine the influence of service quality, customer’s satisfaction and religiosity on customer’s patronage decision toward health insurance…

Abstract

Purpose

The purpose of this paper is to examine the influence of service quality, customer’s satisfaction and religiosity on customer’s patronage decision toward health insurance products. The paper also assesses the influence of religiosity on customer’s patronage decision. The influence of customers’ satisfaction as mediation between service quality and customer’s patronage decision was also measured.

Design/methodology/approach

A structured questionnaire was developed and administered to a sample of 200 respondents. This research applied the exploratory factor analysis, the confirmatory factor analysis and the structural equation modeling to test the proposed hypotheses.

Findings

The findings indicate that customers’ religiosity behavior has a significant influence on customer’s patronage decision for selecting health insurance products. The results also indicated that the role of customer’s satisfaction as a mediator in between the relationship of service quality and customer’s patronage decision is significant.

Research limitations/implications

This research is a cross-sectional study consisting of 200 respondents. In addition, the elements of the sample were Malaysian customers using health insurance products and services.

Practical implications

This study suggests that customers of health insurance products are more concerned with perceived service quality and perceived satisfaction. The role of religiosity also plays a dominant role. As a result, managers of the health insurance service providers need to focus more on benefits of service varieties centered toward their target customers in order to gain higher patronage decision of health insurance products.

Originality/value

The study sought to address the gap of religiosity aspects in health insurance products through intensive literature and offer a conceptual framework that tested service quality, customer’s satisfaction and religiosity in one integrated model under the perspective of health insurance industry. More importantly, it also examines the influence of religiosity on patronage behavior, thus shedding insights into the opportunities for understanding consumers in detail.

Details

Asia Pacific Journal of Marketing and Logistics, vol. 30 no. 1
Type: Research Article
ISSN: 1355-5855

Keywords

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