Petronas University of Technology
Ipoh, Malaysia

Universiti Teknologi PETRONAS is a Malaysian private university. It was established on 10 January 1997. The campus is built on a 400 hectare site strategically located at Bandar Seri Iskandar, Perak Darul Ridzuan, Malaysia. The university is a wholly owned subsidiary of PETRONAS, the national oil company of Malaysia.UTP places strong emphasis on Research and Development as it strives to achieve the status of an internationally renowned Research University. The university conducts extensive research activities in collaboration with PETRONAS and other institutions and industries locally and abroad focusing on Enhanced Oil Recovery, Carbon Dioxide Management, Deepwater Technology, Nanotechnology, Green Technology, Biomedical Technology, Hybrid Energy Systems, Intelligent Cities and Sustainable Resources. This is evident when UTP was awarded a 5-star rating by Malaysian Research Assessment Instrument for its research, development and commercialisation efforts recently.In recent years, UTP is ranked in the top 200 in the 2014 Quacquarelli Symonds World University Ranking by subject for Chemical Engineering. UTP is the only private university in Malaysia to be ranked in the top 200 for the 2014 QS Asia University Rankings and ranked at 335 for the QS World University Rankings under Engineering and Technology Faculty. Wikipedia.

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Naz M.Y.,Petronas University of Technology | Sulaiman S.A.,Petronas University of Technology
Journal of Controlled Release | Year: 2016

Developing countries are consuming major part of the global urea production with an anticipated nitrogen use efficiency of 20 to 35%. The release of excess nitrogen in the soil is not only detrimental to the environment but also lessens the efficiency of the conventional urea. The urea performance can be enhanced by encapsulating it with slow release coating materials and synchronizing the nutrients' release with the plant up-taking. However, the present cost of most of the coated fertilizers is considerably higher than the conventional fertilizers. The high cost factor prevents their widespread use in mainstream agriculture. This paper documents a review of literature related to the global urea market, issues pertaining to the conventional urea use, natural and synthetic materials for slow release urea and fluidized bed spray coating process. The aim of the current review is to develop technical understanding of the conventional and non-conventional coating materials and associated spray coating mechanism for slow release urea production. The study also investigated the potential of starch as the coating material in relation to the coatings tested previously for controlled release fertilizers. © 2016 Elsevier B.V. All rights reserved.

Khor C.S.,Petronas University of Technology | Lalchand G.,Jalan Terasek Dua
Renewable and Sustainable Energy Reviews | Year: 2014

This review focuses on energy for grid-connected electricity generation for West (Peninsular) Malaysia. A historical perspective of Malaysia′s energy policies and energy-related initiatives is first provided, which sets the scene for an assessment of current situation in the country. We recommend a number of sustainable options for addressing the projected energy deficits in Malaysia up to year 2030, besides meeting the drive for low carbon systems and technologies. The latter is in direct response to an announcement by the Prime Minister of Malaysia on a conditional voluntary target of 40% reduction in the emissions intensity per unit of GDP by 2020 from a 2005 baseline at the COP15 meeting in Copenhagen. Alternative strategies are suggested that promote enhanced roles for renewable energy (RE) as well as energy efficiency and conservation (EE&C) practices based on a review of past and present policies and current developments. A greater contribution of RE from biomass, biogas, hydroelectric power, and solar photovoltaic is proposed compared to the present less than 1%, in concert with continuous more widespread adoption of EE&C initiatives. Strategies are also advocated to improve coal supply reliability and security. On top of these measures, the Malaysian government is urged to moderate energy subsidies while enforcing a common energy regulatory framework that involve all relevant agencies and parties. © 2013 Elsevier Ltd.

The unsteady laminar free convection flow between two long vertical parallel plates with ramped wall temperature at one boundary has been investigated in the presence of thermal radiation and chemical species concentration. The exact solutions of the momentum, energy and concentration equations have been obtained using the Laplace transform technique. The velocity and temperature profiles, skin-friction and Nusselt number variations are shown graphically and the numerical values of the volume flow rate, the total heat rate and species rate added to the fluid are presented in a table. The influence of different system parameters such as the radiation parameter (R), buoyancy ratio parameter (N), Schmidt number (Sc) and time (t ) has been analyzed carefully. A critical analysis of the coupled heat and mass transfer phenomena is provided. The free convective flow due to ramped wall temperature has also been compared with the baseline case of flow due to constant wall temperature. © Springer Science+Business Media B.V. 2012.

Elmolla E.S.,Al - Azhar University of Egypt | Chaudhuri M.,Petronas University of Technology
Journal of Hazardous Materials | Year: 2011

The study examined combined photo-Fenton-SBR treatment of an antibiotic wastewater containing amoxicillin and cloxacillin. Optimum H 2O 2/COD and H 2O 2/Fe 2+ molar ratio of the photo-Fenton pretreatment were observed to be 2.5 and 20, respectively. Complete degradation of the antibiotics occurred in one min. The sequencing batch reactor (SBR) was operated at different hydraulic retention times (HRTs) with the wastewater treated under different photo-Fenton operating conditions (H 2O 2/COD and H 2O 2/Fe 2+ molar ratio). The SBR performance was found to be very sensitive to BOD 5/COD ratio of the photo-Fenton treated wastewater. Statistical analysis of the results indicated that it was possible to reduce the Fe 2+ dose and increase the irradiation time of the photo-Fenton pretreatment. The best operating conditions of the combined photo-Fenton-SBR treatment were observed to be H 2O 2/COD molar ratio 2, H 2O 2/Fe 2+ molar ratio 150, irradiation time 90min and HRT of 12h. Under the best operating conditions, 89% removal of sCOD with complete nitrification was achieved and the SBR effluent met the discharge standards. © 2011 Elsevier B.V.

El-Khatib N.A.F.,Petronas University of Technology
SPE Journal | Year: 2012

A mathematical model is developed for performance prediction of waterflooding performance in communicating stratified reservoirs with a dip angle from the horizontal. The effect of the gravitational force is reflected by a dimensionless gravity number in the fractional flow formula. The gravity number accounts for the dip angle and the density difference between the displacing and displaced fluids. The developed fractional flow formula is used to estimate the fractional oil recovery, the dimensionless time, and the injectivity ratio at times of water breakthrough in the successive layers. The developed model allows for each layer to have its own porosity, endpoint saturations, and endpoint relative permeabilities. Solutions for the waterflooding performance in inclined communicating stratified systems with log-normal permeability distribution were obtained and compared with that of the horizontal systems. The effects of the gravity number, the mobility ratio, and the Dykstra-Parsons permeability-variation coefficient V DP on the performance were investigated. The obtained results showed that the gravity effect of the dip angle enhances the performance in terms of delayed water breakthrough, higher fractional oil recovery, and lower water cut. This improved performance is more significant in the cases of unfavorable mobility ratio and of highly heterogeneous reservoirs. Reservoir dipping does not affect the pseudorelative permeability functions but results in a decrease in the injectivity ratio. Copyright © 2012 Society of Petroleum Engineers.

Nasrifar K.,Petronas University of Technology
Industrial and Engineering Chemistry Research | Year: 2013

A simplified hard-chain dimer theory is employed with perturbed-chain statistical associating fluid theory (PC-SAFT) in calculating the vapor pressures and saturated liquid volumes of pure n-alkanes from methane to n-eicosane. Compared to the original PC-SAFT, the developed model is in better agreement with the experimental vapor pressures and saturated liquid volumes of n-alkanes along the vapor-liquid coexistence curve and the critical properties from n-butane toward longer n-alkanes. Predicting the vapor-liquid equilibria (VLE) of binary mixtures containing methane and a long-chain n-alkane, the new model describes the mixtures more accurately than PC-SAFT. With no binary interaction parameter, the model adequately describes the experimental VLE data, in particular, near the critical points. In the prediction of the VLE of mixtures containing ethane, propane, n-hexane, and a long-chain n-alkane, the differences between the two models become less appreciable. © 2013 American Chemical Society.

Vasant P.,Petronas University of Technology
International Journal of Computational Methods | Year: 2010

This paper describes the origin and the significant contribution of the development of the hybrid simulated annealing and genetic algorithms (HSAGA) approach to obtaining global optimization. HSAGA provides an insightful way to solve complex optimization problems. It is a combination of the metaheuristic approaches of simulated annealing and novel genetic algorithms to solving a nonlinear objective function with uncertain technical coefficients in industrial production management problems. The proposed novel hybrid method is designed to search for global optimization for the nonlinear objective function and to search for the best feasible solutions to the decision variables. Simulated experiments were carried out rigorously to reflect the advantages of the method. A description of the well-developed method and the advanced computational experiment with the Matlab® technical tool is presented. An industrial production management optimization problem is solved using the HSAGA technique. The results are very promising. © 2010 World Scientific Publishing Company.

Vasant P.,Petronas University of Technology
Mathematical and Computer Modelling | Year: 2013

The fuzzy optimization problem is one of the prominent topics in the broad area of artificial intelligence. It is applicable in the field of non-linear fuzzy programming. Its application as well as practical realization can been seen in all the real world problems. In this paper a large scale non-linear fuzzy programming problem was solved by hybrid optimization techniques like Line Search (LS), Simulated Annealing (SA) and Pattern Search (PS). An industrial production planning problem with a cubic objective function, eight decision variables and 29 constraints was solved successfully using the LS-SA-PS hybrid optimization techniques. The computational results for the objective function with respect to vagueness factor and level of satisfaction has been provided in the form of 2D and 3D plots. The outcome is very promising and strongly suggests that the hybrid LS-SA-PS algorithm is very efficient and productive in solving the large scale non-linear fuzzy programming problem. © 2011 Elsevier Ltd.

Minh V.T.,Petronas University of Technology
Mathematical and Computer Modelling | Year: 2013

This paper investigates quadratic stabilizability for switched dynamic hybrid systems with polytopic uncertainties via a common Lyapunov matrix or via closed loop linear quadratic state feedback regulators. The switched linear systems for stable closed loop matrices can guarantee the global asymptotical stability for any switched linear systems with any switching signal sequence. © 2011 Elsevier Ltd.

Elmolla E.S.,Petronas University of Technology | Chaudhuri M.,Petronas University of Technology
Journal of Hazardous Materials | Year: 2010

The study examined the effect of operating conditions (zinc oxide concentration, pH and irradiation time) of the UV/ZnO photocatalytic process on degradation of amoxicillin, ampicillin and cloxacillin in aqueous solution. pH has a great effect on amoxicillin, ampicillin and cloxacillin degradation. The optimum operating conditions for complete degradation of antibiotics in an aqueous solution containing 104, 105 and 103 mg/L amoxicillin, ampicillin and cloxacillin, respectively were: zinc oxide 0.5 g/L, irradiation time 180 min and pH 11. Under optimum operating conditions, complete degradation of amoxicillin, ampicillin and cloxacillin occurred and COD and DOC removal were 23.9 and 9.7%, respectively. The photocatalytic reactions under optimum conditions approximately followed a pseudo-first order kinetics with rate constant (k) 0.018, 0.015 and 0.029 min-1 for amoxicillin, ampicillin and cloxacillin, respectively. UV/ZnO photocatalysis can be used for amoxicillin, ampicillin and cloxacillin degradation in aqueous solution. © 2009 Elsevier B.V. All rights reserved.

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