Thumbnail | Name | Publication Date | First Public Date | Contributors |
Evaluation of spalling fallout on excavation disturbed zone under deep hard rock tunnel / Romziah Azit 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... | 3/5/2020 | 1/1/2017 | Romziah Azit - Author | |
Evaluation of rock overstressing in the excavation of pahang-selangor raw water transfer tunnel project/Mohd Ashraf Mohamad Ismail , Romziah Azita, Norzani Mahmood Tunneling under high overburden and high in-situ stress may lead to tunnel instability due to rock overstressing in its surrounding. Overstressing of the hard rock tunnel can cause brittle fractures in the form of rock burst or spalling, which may cause safety hazards, damage of equipment and production disturbances. Therefore, the evaluation of ov... | 3/5/2020 | 10/14/2014 | Mohd Ashraf Mohamad Ismail - Author Romziah Azit - Author Norzani Mahmood - Author | |
Brittle failure simulation of Pahang Selangor raw water transfer tunnel under rock overstressing/Heyam H. Shaalan, Mohd Ashraf Mohamad Ismail, Romziah Azit 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... | 3/5/2020 | 10/29/2018 | Heyam H. Shaalan - Author Mohd Ashraf Mohamad Ismail - Author Romziah Azit - Author | |
Fabrication and characterization of hypoeutectic open-cell al-si foams using gravity die casting and squeeze casting /Samsudin Fitri Aida, Mirsad Nur Hijrah, Amirah Ahmad Hamdi, Hussain Zuhailawati, Abu Seman Anasyida Gravity die casting and squeeze casting are the techniques used for the fabrication of hypoeutectic open-cell Al-Si foams which are characterized and studied for their energy absorbing quality in compression tests. The effect of different amounts of sodium chloride (NaCl) (up to 56 vol.%) as a space holder in the casting of aluminum foam on the mor... | 3/4/2020 | 1/1/2016 | Zuhailawati, Hussain - Author Samsudin Fitri - Author Anasyida Abu Seman - Author | |
Effect ofnacl as a space holder in producing open cell A356 aluminium foam by gravity die casting process/ S.F. Aida , M.N. Hijrah, A.H.Amirah, H. Zuhailawati , A.S. Anasyida 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... | 3/4/2020 | 1/1/2016 | Dr. Zuhailawati Hussain - Author Anasyida Abu Seman - Author | |
Analysis of rock burst behaviour under overstressed rock in deep tunnel excavation across the titiwangsa range, Malaysiatle of research/Prof. Madya Dr Mohd Ashaf Bin Mohamad, Prof. Madya Dr. Fadzli Mohamaed Nazri In this study a critical section of the Pahang—Selangor raw water transfer tunnel under high overburden stress creates a zone of rock failure along the sides of the tunnel. This zone damages the steel fiber-reinforced shotcrete lining, and the observed failure depth in this zone is approximately 0.3 m. Elastic analysis model, elastic-perfectly plas... | 3/4/2020 | 9/1/2018 | Prof. Madya Dr. Mohd Ashaf Mohamad - Author | |
A single-stage led driver with voltage doubler rectifier/Nurul Asikin, Zawawi , Shahid Iqball, Mohamad Kamarol, Mohd Jamil 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... | 3/4/2020 | 12/2/2016 | Nurul Asikin - Author Shahid Iqball - Author Mohamad Kamarol - Author | |
Effect of nozzle rotation angles and sizes on thermal characteristic of swirl anti-icing t /Mohd Azmi Ismail , Jian Wang The Federal Aviation Administration requires all ai rcraft manufacturers to ad here to maximum noise level standards. Thus, a bias acoustic l i ner is introduced. to intensi fy the noise eq u ipment system. as well as preven t ice accumulation on the nacelle 0-chamber. The hotspot phenomenon. by the Piccolo tu be anti-i<.:ing sysh:m. cou ld da... | 3/3/2020 | 5/18/2018 | Mohd Azmi Ismail - Author Jian Wang - Author | |
Mechanics of mineral and oxides based 3D cordierite tempalte_Prof Madya Dr. Hasmaliza Mohamed 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... | 2/26/2020 | 12/12/2018 | Prof. Madya Dr. Hasmaliza Mohamad - Author | |
Effect of freezing temperature on the pore formation of beta /Dr. Nurazreena Ahmad . Beta-tricalcium phosphate (P-TCP) has been widely used for biomedical application due to its excellent mechanical strength, good tissue compatibility and outstanding chemical stability. There are several methods to fabricate porous scaffolds including solvent casting, phase separation, rapid prototyping and electrospinning methods. In the present... | 2/26/2020 | 3/1/2018 | Dr. Nurazreena Ahmad - Author | |
Effect of calophyllum inophyllum biodiesel-diesel blends on combustion, performance, exhaust particulate matter and gaseous emissions in a multi-cylinder diesel engine /H.G.How , H.H. Masjuki 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... | 2/26/2020 | 4/16/2018 | H.G., How - Author H.H. Masjuki - Author | |
Developments of entropy-stable residual distribution methods for conservation laws 1 scalar problems /Farzad Ismail , Hossain Chizari This paper presents preliminary developments of entropy-stable residual distribution methods for scalar problems. Controlling entropy generation is achieved by formulating a entropy conserved signals distribution coupled with an entropy-stable signals distribution.Numerical results of the entropy-stable residual distribution methods are accurate an... | 2/26/2020 | 11/2/2016 | Farzad Ismail - Author Hossain Chizari - Author | |
Allylic and epoxy monomers as reactive plasticizers in polyetherimide /Dr. Arjulizan Rusli 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... | 2/26/2020 | 9/20/2010 | Dr. Arjulizan Rusli - Author | |
Advanced workshop on hyperbolic conservation laws _Prof. Ismail Farzad | 2/26/2020 | 11/16/2018 | Prof. Ismail Farzad - Author | |
A grid-insensitive lda method on triangular grids solving the system of euler equations/Hossain Chizari, Farzad Ismail 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... | 2/26/2020 | 11/17/2016 | Hossain Chizari - Author Farzad Ismail - Author | |
A study on the effects of three-dimensional crack tip constraint in mixed modes problem numerical and experimental analysis / lr. Dr. Feizal Yusof, Prof. Madya Prof.Choong Kok Keong Failure of engineering structures usually manifest from cracks preceded by local plastic deformation. The characterization of three-dimensional crack tip plastic deformation hence is important to assessment of susceptibility of cracks in structures. Three-dimensional elastic plastic techniques are available but application to complex problem are ... | 1/9/2020 | 4/10/2015 | lr. Dr. Feizal Yusof - Author Prof. Madya Choong Kok Keong - Author | |
Synergistic response of pogostemon cablin (blanco) benth cell suspension cultures to precursor feeding and elicitation / Dr.Derek Chan Juinn Chieh, Fatin Izzatie Mazlan 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... | 12/30/2019 | Dr.Derek Chan Juinn Chieh - Author Fatin Izzatie Mazlan - Author | ||
Melamine-nitrogenated mesoporous activated carbon derived from rice husk for carbon dioxide adsorption in fixed-bed / A.L. Yaumi, M.Z. Abu Bakar This work presents the preparation of melamine-nitrogenated mesoporous activated carbon from rice husk via single step chemical activation with phosphoric acid and subsequent modifica tion with mel amine for efficient carbon dioxide adsorption. The nitrogen-containing carbons were characterized for their textural and chemical properties an... | 12/30/2019 | 5/2/2018 | Yaumi, A.L. - Author Abu Bakar M.Z. - Author | |
Chitosan-bleaching earth clay composite as an efficient adsorbent for carbon dioxide adsorption Process optimization_M. Azharul Islam, Y. L. Tan 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... | 12/30/2019 | M. Azharul Islam - Author | ||
Asymptotic crack tip fields of surface cracked panels under non-hardening bending loads / Rizman Hariz, Abdul Latiff , Feizal Yusof In this paper, the investigation of in-plane constraint loss in a semi-elliptical surface cracked panei(SCP)
specimen based on a detailed non-hardening finite element analysis with aspect ratios ale ofO.S and relative depths aft of 0.33 and 0.5 under bending loads. The asymptotic stress field solutions were compared to the fully constrained Prandt... | 12/30/2019 | 1/1/2016 | Rizman Hariz - Author Abdul Latiff - Author Feizal Yusof - Author | |
Analysis of pedestrian walking characteristics at vertical facilities in underground train station / Nur Sabahiah Abdul Sukor 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... | 12/30/2019 | 1/1/2017 | Nur Sabahiah Abdul Sukor - Author | |
Analysis of pedestrian speed flow relationship based on different egress facilities criteria for pedestrian evacuation / Nur Sabahiah Abdul Sukor The increment of the population in Kuala Lumpur had caused the LRT stations become crowded with excessive demand during the peak hours. This also includes the underground LRT stations especially near the KLCC area. Unfortunately, limited study was done regarding the pedestrian and train passengers at underground spaces in Malaysia. Due to th... | 12/30/2019 | 11/12/2013 | Nur Sabahiah Abdul Sukor - Author | |
An improved method to model semi-elliptical surface cracks using element mismatch in abaqus / R. H. A. Latiff , F. Yusof 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 ... | 12/30/2019 | Latiff R. H. A - Author Yusof F. - Author | ||
Evaluation of TBM tunnel with respect to stability agains spalling / Prof Madya Dr. Mohd Ashraf Mohd Ismail Abstract. As the depth of tunnels and underground construction increases, instability occurs in the form of rock bursting or spalling because of the induced stresses.Spall ing may appear as a strong compressi ve stress causing crack growth behind the excavated surface and buckling of the thin rock slabs. In this paper, we describe how to reduce th... | 11/12/2019 | 8/1/2019 | Prof. Madya Dr. Mohd Ashraf Mohd Ismail - Author | |
Effect of Calophyllum Inophyllum biodiesel-diesel blends on combustion, performance, exhaust particulate matter and gaseous emissions in a multi-cylinder diesel engine 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... | 8/23/2019 | 6/1/2019 | Mohd Azmi Ismail - Author Jian Wang - Author |