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Article
Publication date: 20 February 2014

A. Muzathik, Y. Nizam, M. Ahmad and W. Nik

Friction material in an automotive brake system plays an important role for effective and safe brake performance. A single material has never been sufficient to solve performance…

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Abstract

Friction material in an automotive brake system plays an important role for effective and safe brake performance. A single material has never been sufficient to solve performance related issues. Current research aimed to examine properties of Boron mixed brake pads by comparing them with the commercial brake pads. Friction coefficient of Boron mixed brake pads and commercial brake pads were significantly different and increased with the increase in surface roughness. The abrupt reduction of friction coefficient is more significant in commercial brake pad samples than in Boron mixed brake pad formulations. Fade occurred in commercial brake pad sample at lower temperatures. Boron formulations are more stable than their commercial counterparts.

Details

World Journal of Engineering, vol. 10 no. 6
Type: Research Article
ISSN: 1708-5284

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Article
Publication date: 24 February 2025

Aprajita Kaushik, Sanjeev Singh and Manmohan Kapshe

The natural ventilation in tall buildings is significantly different from that in low-rise buildings. It is imperative to record the wind available on site as a prerequisite for…

7

Abstract

Purpose

The natural ventilation in tall buildings is significantly different from that in low-rise buildings. It is imperative to record the wind available on site as a prerequisite for designing wind-driven natural ventilation. This paper aims to establish the significance of collecting site-based wind data and highlights the gap between the observed wind speed and the one used in practice.

Design/methodology/approach

The method consists of experimental study to determine the available wind speed for a 100-metre-high building in a warm and humid climate. The analytical mathematical model that uses the interpolation method based on secondary wind data was used to equate wind velocity at such heights. The study compares both methods to understand the gap in predicting the vertical wind profile.

Findings

The existing practice of using a wind rose and predictive mathematical model needs to be confirmed with site-based wind data before being used as an input parameter for designing for natural ventilation on upper floors.

Research limitations/implications

Further studies can be undertaken to establish the variation of wind speed at the midriff of the building, derive an average rate of decrease in wind velocity and give a generalised wind input as a design guideline. A correction factor for the change in wind velocity can be helpful in determining the wind profile in the vertical component closest to the real-time data. The study is limited to outdoor wind velocity at various heights encountered at the windward side of the building. The study is region-specific.

Originality/value

The practice by designers and architects to use wind rose, composed of wind data available at 10-metre height, to design for naturally ventilated high-rise buildings is redundant. The study shows that the wind velocity profile changes beyond 20 metres. The prospect of a sustainable high-rise project is dependent on efficient natural ventilation, and hence the input wind velocity cannot be generic.

Details

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

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Article
Publication date: 16 November 2015

Hayrol Azril Mohamed Shaffril, Jeffrey Lawrence D'Silva, Nurani Kamaruddin, Siti Zobidah Omar and Jusang Bolong

The present paper attempts to investigate the awareness of coastal community towards climate change in Malaysia and to explore the factors associated with their awareness toward…

1794

Abstract

Purpose

The present paper attempts to investigate the awareness of coastal community towards climate change in Malaysia and to explore the factors associated with their awareness toward the climate change.

Design/methodology/approach

This is a quantitative study where a set of questionnaires was developed based on reviews of literature and series of instrument development meeting. Through a multi-stage cluster sampling, a total of 210 respondents from three coastal villages in Peninsular Malaysia were selected.

Findings

The coastal community are shown to record a high mean score on their awareness toward changes relating to the sea, temperatures and the coast. Surprisingly, fishermen are found to be less aware toward climate change compared to other groups, such as housewives/retirees and students. Further analysis confirms that there are significant differences regarding coastal community awareness to changes relating to the sea, temperatures and the coast.

Research limitations/implications

This study represented the answers of 210 respondents who were randomly selected from three coastal villages in Peninsular Malaysia, and the results might be enriched if the number of respondents is increased and respondents from other villages are included. A future study should be conducted to gather information on the possible effects, rather than focusing on the respondents’ awareness. Additionally, because of the nature of the topic, non-governmental organizations (NGOs) and officers from environment-related agencies should cooperate during the research.

Practical implications

It is recommended that information management activities with regard to the climate change should be actively conducted by NGOs, universities and related parties.

Originality/value

Most of the related studies are scientific in nature, leading to a gap relating to the social aspects of climate change, particularly in terms of communities’ awareness toward the climate change. Moreover, a number of local studies have produced inconsistencies in term of their results regarding the awareness of the climate change among the community. In response to this, the current study aims to fill this gap.

Details

International Journal of Climate Change Strategies and Management, vol. 7 no. 4
Type: Research Article
ISSN: 1756-8692

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Article
Publication date: 5 December 2016

Mohd Zamri Ibrahim and Aliashim Albani

This paper aims to present a method of the wind turbine ranking, either stall or pitch-regulated wind turbine (WTG), to determine the suitability of wind turbine in a selected…

491

Abstract

Purpose

This paper aims to present a method of the wind turbine ranking, either stall or pitch-regulated wind turbine (WTG), to determine the suitability of wind turbine in a selected site.

Design/methodology/approach

The method included the wind park target capacity, the maximum hub-height, the standard rotor diameter and the characteristic of wind speed on the site. As the method had been applied to a wind park, with more than one wind turbine, the wake losses had been considered by subtracting the gross capacity factor. Besides, the turbine-site matching index (TSMI) was computed by dividing the net capacity factor with the total installed capital cost per kilowatt.

Findings

The components of the total installed capital cost were cost of turbine, installation, as well as operation and maintenance. Meanwhile, the target capacity index (TCI) was calculated by dividing the estimated wind park capacity with the target wind park capacity.

Originality/value

Both TSMI and TCI were used together to rank the wind turbines. Furthermore, a site in the eastern part of Kudat was selected as the case study site, where ten models of wind turbines were tested and ranked.

Details

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

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