The prediction of compressive stress-induced failures is of concern when designing and constructing facilities in rock for deep underground excavation. The purpose of this study is to model compressive stress-induced failure and fallouts with appropriate material models and strength parameters for deep hard rock tunnel excavation. Three method of n...

Modelling a rock brittle failure around underground openings is used to simulate or contemplate the shape, depth and extent of the failure zone and achieved a suitable ground support system, consequently the underground construction safety increases and the construction cost decreases. This study analyses the critical section of the Pahang Selangor...

Gravity die casting is the technique which enables fabrication of open-cell A356 aluminium foam as a suitable absorber material with good quality performance. A356 aluminium alloy was used with varies amount of sodium chloride (NaCI) particles as a space holder to fabricate the aluminium foam using gravity die casting. Microstructural analysis, por...

In this paper, a configuration of a single-stage AC-DC converter and a high voltage resonant controller IC 1.6598 for LED street light driver is discussed. The converter is obtained by integrating two boost circuits and a half-bridge LLC resonant circuit. A voltage double rectifier circuit is adopted as output to lower the voltage stress on transfo...

In this study, cordierite was prepared by glass-route method using Si02, A1203 and MgO as raw materials. Cordierite powder produced was then used to fabricate 3-D porous cordierite using gel casting method using different amount of GRF (2.5, 4.0 and 6.0g) and dried egg white (DEW) (1.5, 2.5 and 4.0g) as binder to observed their effect on the streng...

In this work, the effects of adding of inedible Calophyllum Inophyllum biodiesel to diesel fuel on performance, gaseous emissions, particulate matter (PM) and combustion characteristics were studied in a medium-duty, highpressure common-rail turbocharged four-cylinder diesel engine under different speed and torque conditions. The key physicochemica...

Addition of allylic and epoxy monomers as reactive plasticizers in polyetherimide(PEl) was investigated to improve processibility without reduction of thermo-mechanical properties of the PEI. Blends of various concentrations of PEI and monomers with different initiators/curatives were prepared by solvent and melt blending methods. Miscibility study...

The performance of the classic upwind-type residual distribution (RD) methods on skewed triangular grids are rigorously investigated in this paper. Based on an improved signals distribution, an improved second order RD method based on the LDA approach is proposed to faithfully replicate the flow physics on skewed triangular grids. It will be mathem...

This research investigates the synergistic effect of precursor feeding and elicitation towards the production of patchouli alcohol (PA) from Pogostemon cab/in callus and cell suspensron cultures rn shake flask systems. Initial study on feeding cis-farnesol as the precursor to activate PA production revelead tho prt sence of 68 mg/ml of PAin the c...

In this study, chitosan-bleaching earth clay composite (Chi-BE) was prepared in three different ratios (1:0.4, 1:0.6 and 1:0.8) by the alkali gelation method for carbon dioxide (COv adsorption in a fixed-bed adsorption system. Chi-BE (1:0.6) with best adsorption capacity was selected through fractional factorial design and characte...

Kuala Lumpur is the national capital of Malaysia as well as the center of attraction for people looking for jobs. Thus, in the future people will tend to use public transport including the Light Rail Transit (LRT) more often than driving their vehicle. This is especially so due to critical traffic congestion on the road especially durin...

The purpose of this paper is to propose and investigate the feasibility of using multiple element types in a single model, termed element mismatch, for a three-dimensional semi-elliptical crack problem. The purpose behind the exploration of this method is to ease the meshing process in complex models. Multiple semi-elliptical surface ...

In this work, the effects of add ing of ined ible Calophyllum lnophyllum biodiescl to diesel fuel on performance, gaseous emissions, pnrticulnte matter (PM) a nd combustion cha racter istics were stud ied in a med i um-du ty, high• pressu re common- ra il turbocharged four-cylinder diesel engine under different speed and torq ue conditions. The k...