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Article
Publication date: 8 May 2017

Nor Syahirah Mohamad and Salmiah Kasolang

An optimized model is often deployed to reduce trial and error in experimental approach and obtain the multi-variant correlation. In this study, response surface methodology…

219

Abstract

Purpose

An optimized model is often deployed to reduce trial and error in experimental approach and obtain the multi-variant correlation. In this study, response surface methodology (RSM), namely, Box–Behnken design (BBD) approach, has been used to optimize the characterization of lubricant with additives. BBD is based on multivariate analysis whereby the effects of different parameters are considered simultaneously. It is a non-linear system which is more representative of the actual phenomenon. This study aims to investigate the effect of three independent variables, namely, speed, load and concentration of TiO2, on the coefficient of friction (CoF).

Design/methodology/approach

RSM was applied to get the multiplicity of the self-determining input variables and construct mathematical models. Mathematical models were established to predict the CoF and to conduct a statistical analysis of the independent variables’ interactions on response surface using Minitab 16.0 statistical software. Three parameters were regulated: speed (X1), load (X2) and concentration of TiO2 (X3). The output measured was the CoF.

Findings

The result obtained from BBD has shown that the most influential parameter was speed, followed by concentration of TiO2 nanoparticles and then normal load. Analysis of variance indicated that the proposed experiment from the quadratic model has successfully interpreted the experimental data with a coefficient of determination R2 = 0.9931. From the contour plot of BBD, the optimization zone for interacting variables has been obtained. The zone indicates two regions of lower friction values (<0.04): concentration between 0.5 to 1.0 Wt.% for a speed range of 1,000 to 2,000 rpm, and load between 17 to 20 kg for a speed in the range of 1,200 to 1,900 rpm. The optimized condition shows that the minimum value of CoF (0.0191) is at speed of 1,782 rpm, load of 20 kg and TiO2 concentration of 1.0 Wt.%.

Originality/value

In general, it has been shown that RSM is an effective and powerful tool in experimental optimization of multi-variants.

Details

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

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Article
Publication date: 9 March 2020

Nor Syahirah Zain and Zulkarnain Muhamad Sori

This study aims to explore a sustainable and responsible investment (SRI) sukuk model based on Musharakah that could be implemented to develop waqf properties and assets under the…

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Abstract

Purpose

This study aims to explore a sustainable and responsible investment (SRI) sukuk model based on Musharakah that could be implemented to develop waqf properties and assets under the SRI sukuk framework in Malaysia. This includes proposing and designing a potential SRI sukuk model and seeking the opinion of subject-matter experts and industry practitioners on the model, its attractiveness to investors and its feasibility to implement in Malaysia.

Design/methodology/approach

The study adopts desk research and semi-structured interview as its methodology. A desk research is where a detailed critical review and analysis of past literature from reports, journals, framework, books and practices are undertaken. To establish a SRI sukuk model, the paper also studies the cases of the first SRI sukuk issued in Malaysia and other waqf-related sukuks that have been structured for the development of waqf property/asset in the past. Following that, the opinion of subject-matter experts and industry practitioners on the proposed SRI sukuk model is sought in a semi-structured interview.

Findings

Based on the interviewees’ response, the study proposes the most feasible SRI sukuk model that could be implemented in the Malaysian context for the development of waqf properties/assets, which is a Musharakah-based sukuk model. The model will be elaborated based on the purpose of development, functionality, choice of Shari’ah contract, obligor and return mechanism.

Research limitations/implications

This paper is exploratory in nature. While it explores the structural point of view only, future research could analyse and identify the legal, regulatory, financial and Shari’ah aspects of the proposed model. Further empirical studies can be done to provide more comprehensive idea and knowledge regarding the subject matter.

Practical implications

The study serves great benefit to the government, waqf administrators, regulators, policymakers, foundations, corporations and interested investors to explore SRI sukuk as one of the feasible financial instruments to develop waqf in Malaysia.

Originality/value

This study proposes the use of an innovative financial instrument called SRI sukuk and structures a feasible SRI sukuk model to help realise the true roles of waqf as not only a religious tool but also one of the instruments for human, economic and social developments.

Details

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

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