An excessive trim by stern on a high-speed craft is vulnerable to decrease comfortable ride incorporated with the large pitch motion. To prevent such problem, the craft is then equipped with a device known as “trim-tabs” providing a lift force at the stern region, which leads to reduce pitch angle/trim of the craft. This paper presents computational modelling of trim-tabs on high-speed craft towards reducing the pitch motion in the calm water condition. Here, the commercial Computational Fluid Dynamic (CFD) software; called Numeca Fine Marine has been accordingly utilised to evaluate several effects of Froude numbers (Fr) and angle of the trim-tabs into characteristics of the lift force of the high-speed craft. The results revealed that the pitch motion of the high-speed craft equipped with the trim-tabs (5o) has significantly reduced up to 76% at Fr = 1.0. This can be explained that the installed trim-tabs has increased the negative trim moment, which inherently creates the restoring moment pushing the stern up along the pitch-axis. Meanwhile, this may cause involuntary the total ship’s resistance increased. In general, this simulation pointed out the advantage of the trim-tabs to increase the comfortability of the high-speed craft.
1 January 2017 in Electronic Government, an International Journal
This study examines the role of effort expectancy and social influence in explaining Malaysian government service acceptance of e-government services from the perspective of Malaysian government servants. The paper is based on survey data (n = 543) collected in Pahang, Malaysia between April 2014 to July 2014 and was analysed by using SPSS 20 (Statistical Package for the Social Sciences). The analysis of data was performed by a combination of exploratory factor analysis (EFA) and multiple linear regressions. Results show that the combination of effort expectancy (β = 0.373, p < 0.01) and social influence (β = 0.329, p < 0.01) were found to have significant impacts on continuance intention to use e-government practices. It is anticipated that the findings will be useful for policy makers in order to enhance the Malaysian e-government service practices. Limitations encountered in the study as well as suggestions for future research are also included.
In recent years, Arenga Pinnata and kenaf fibres have been discovered to have a high potential for usage as fibre reinforcement in material matrix composites for a several of application. The scope for this study is to encourage widespread use of eco hybrid composite in various applications specifically in the maritime field. The purpose of this study is to look into the influence of fibre loading on manufacturing defects and interfacial adhesion of Arenga Pinnata and kenaf fibre reinforced fiberglass/kevlar hybrid composite materials used in boat construction. The hybridization of natural fibre with fiberglass/kevlar is recommended as a solution to overcome the disadvantages of natural fibre which can give balanced strength and stiffness, enhances fatigue resistance, fracture toughness and impact resistance. General conditions in green composites are proposed, along with some preliminary data on the mechanical hybrid composites. In conclusion, the percentage of Arenga Pinnata and kenaf fibre contents that show reduces manufacturing defects and excellent interfacial adhesion will be proposed for boat construction.