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Sari R.,National University of Malaysia | Yaakob Z.,National University of Malaysia | Ismail M.,National University of Malaysia | Daud W.R.W.,National University of Malaysia | And 2 more authors.
Ceramics International | Year: 2013

In this work, the performance of a novel coating of palladium over an alumina ceramic membrane was studied to enhance the hydrogen selectivity produced by an ethanol steam reforming reaction. Preparation of the palladium coated ceramic alumina membrane tube was performed using a combined sol-gel process and an electroless plating technique. Characterisation of the membrane was conducted using SEM and AFM. The palladium-alumina membrane was housed in the module membrane, and then packed with CuO-ZnO commercial catalyst to carry out the ethanol steam reforming reaction in a solid-gas phase. The reaction temperature and H2O/ C2H5OH feed molar ratio of the feed reactants were maintained at 573 K and 13:1, respectively. The reactions were then conducted at various reaction pressures in the range of 1.08-1.38 bar and WHSV of either 37 or 74 h-1. Their effects upon ethanol conversion, hydrogen recovery, hydrogen yield and hydrogen selectivity were investigated. At 1.38 bar with WHSV 37 h-1, the maximum of ethanol conversion (61.5%), hydrogen recovery (42.82%), hydrogen yield (26.75%) and hydrogen selectivity (92.6%) have been measured. © 2012 Elsevier Ltd and Techna Group S.r.l.

Hakim L.,National University of Malaysia | Hakim L.,Malikussaleh University | Yaakob Z.,National University of Malaysia | Ismail M.,National University of Malaysia | And 2 more authors.
Chemical Papers | Year: 2013

Hydroxyapatite-supported Ni-Ce-Cu catalysts were synthesised and tested to study their potential for use in the steam reforming of glycerol to produce hydrogen. The catalysts were prepared by the deposition-precipitation method with variable nickel, cerium, and copper loadings. The performance of the catalysts was evaluated in terms of hydrogen yield at 600 C in a tubular fixed-bed microreactor. All catalysts were characterised by the BET surface area, XRD, TPR, TEM, and FE-SEM techniques. The reaction time was 240 min in a fixed-bed reactor at 600 C and atmospheric pressure with a water-to-glycerol feed molar ratio of 8: 1. It was found that the Ni-Ce-Cu (3 mass %-7.5 mass %-7.5 mass %) hydroxyapatite-supported catalyst afforded the highest hydrogen yield (57.5 %), with a glycerol conversion rate of 97.3 %. The results indicate that Ni/Ce/Cu/hydroxyapatite has great potential as a catalyst for hydrogen production by steam reforming of glycerol. © 2013 Institute of Chemistry, Slovak Academy of Sciences.

Daud M.,Malikussaleh University | Suksmono A.B.,Bandung Institute of Technology | Hendrawan,Bandung Institute of Technology | Sugihartono,Bandung Institute of Technology
Proceedings of 2011 6th International Conference on Telecommunication Systems, Services, and Applications, TSSA 2011 | Year: 2011

One of forward error correction codes that were defined in the IEEE 802.16e standard was the LDPC code. This paper presents the simulation of the LDPC codes using three decoding algorithms, i.e. sum-product algorithm, min-sum algorithm, and min-sum-plus-correction-factor algorithm. Simulation results show the decoding with sum-product algorithm and min-sum-plus-correction-factor algorithm provide BER performances better than the min-sum algorithm. © 2011 IEEE.

Hamid H.A.,University Putra Malaysia | Yunus R.,University Putra Malaysia | Rashid U.,University Putra Malaysia | Choong T.S.Y.,University Putra Malaysia | And 2 more authors.
Fuel | Year: 2016

The experimental studies have shown that a pulsed loop reactor can be used to successfully reduce the reaction time for the transesterification of oils and fats. In the present study, the transesterification of palm methyl ester (PME) and trimethylolpropane (TMP) to produce palm oil based TMP ester was conducted using the vacuum operated pulsed loop reactor. The reaction was catalyzed with sodium methoxide solution in methanol. The influences of five operating variables such as vacuum pressure, catalyst loading, molar ratio of high oleic PME to TMP, reaction temperature and oscillatory speed on the yield of TMP esters and unwanted fatty soap formation were examined. The optimum conditions for the reaction were found at 120 °C, 20 mbar, 3.9:1 M ratio of PME:TMP, 1.0 wt% catalyst solution and 180 rpm oscillatory speed. The product containing 95 wt% TMP triester was successfully synthesized in 1 h with 167 mg/g of fatty soap. The physicochemical properties of the TMP esters obtained using pulse reactor were comparable to characteristics of high oleic TMP esters. © 2015 Published by Elsevier Ltd.

Muhammad,University Putra Malaysia | Muhammad,Malikussaleh University | Choong T.S.Y.,University Putra Malaysia | Chuah T.G.,University Putra Malaysia | And 2 more authors.
Chemical Engineering Journal | Year: 2010

Mesoporous carbon coated monolith prepared from furfuryl alcohol by the dip-coating method was utilized as an adsorbent for adsorption of β-carotene from crude palm oil. The effect of temperature on the adsorption was investigated by batch adsorption experiments. The adsorption quantity increased with increasing temperature. The adsorption was performed using two different solvents, isopropyl alcohol and n-hexane. The maximum adsorption capacity of β-carotene was 62.118. mg/g for isopropyl alcohol at 50 °C. The experimental results were fitted using the Langmuir and Freundlich isotherms. The Langmuir described the adsorption process better. The negative values of Gibbs free energy change suggested that the adsorption was a spontaneous process. The positive values of heat of enthalpy and entropy change confirmed the endothermic nature of the adsorption. © 2010 Elsevier B.V.

Sofyan A.,Malikussaleh University
Procedia Engineering | Year: 2015

Environmental and operational variables and their impact on structural responses have been acknowledged as one of the most important challenges for the application of the ambient vibration-based damage identification in structures. The damage detection procedures may yield poor results, if the impacts of loading and environmental conditions of the structures are not considered. The reference-surface-based method, which is proposed in this paper, is addressed to overcome this problem. In the proposed method, meta-models are used to take into account significant effects of the environmental and operational variables. The use of the approximation models, allows the proposed method to simply handle multiple non-damaged variable effects simultaneously, which for other methods seems to be very complex. The inputs of the meta-model are the multiple non-damaged variables while the output is a damage indicator. The reference-surface-based method diminishes the effect of the non-damaged variables to the vibration based damage detection results. Hence, the structure condition that is assessed by using ambient vibration data at any time would be more reliable. Immediate reliable information regarding the structure condition is required to quickly respond to the event, by means to take necessary actions concerning the future use or further investigation of the structures, for instance shortly after extreme events such as earthquakes. The proposed damage identification method is applied to a numerical finite element model, which is a concrete filled beam bridge that is excited by an ICE train series. The train speed and ambient temperature are chosen as environmental and operational variables respectively. In addition to the natural frequencies, wavelet energy damage indicator is used. The results of the numerical study show that the proposed damage identification method is able to discriminate the damaged and undamaged scenarios of the bridge model. The results also show that the wavelet energy damage indicator is sensitive to small change of structure. However, it does not always have a monotonic trend with respect to damage severity. © 2015 The Authors. Published by Elsevier Ltd. Published by Elsevier Ltd.

Karsono B.,Malikussaleh University | Indira S.,University of Indonesia | Deni,Malikussaleh University
Jurnal Teknologi | Year: 2016

Uniqueness, comfort, security and safety are attributes in a place that can influence the place attachment. Place attachment is the relationship of function and emotional components between people and place that creates meaning. Place attachment in public open spaces is usually related with the bond of the people and its physical environment and also the perception either negative or positive of the place. This research examine the role of uniqueness, comfort, security and safety as attributes which influenced the place attachment in the Kuching Riverfront Promenade (KRP), a popular public space among the locals people. Mixed method approach was using in this research to discovers the role of attributes to place attachment. A total of 165 respondents and 18 stall operators were interviewed, at the same time field survey was conducted in a selected area of the promenade. Findings indicated that the attributes: uniqueness, comfort, security and safety have a strong impact to respondents to identify the local environment and it exerts influence on the place attachment. © 2016 Penerbit UTM Press. All rights reserved.

Karsono B.,Malikussaleh University | Deni,Malikussaleh University | Fithri C.A.,Malikussaleh University
Jurnal Teknologi | Year: 2016

Physical modifications in urban environment can change the meaning of place, whether positive or negatively. Relationship between physical features and activities in urban environment can create functional dependencies and emotional feeling to place. Functional and emotional pattern in a place will influence the level of place attachment. Considering this issue, the research focused to assess the pattern of functional and emotional attachment in Malacca Riverfront Promenade (MRP), a popular urban space corridor along the Malacca River well-known as the historic promenade corridor located in Malacca, Malaysia. Mixed method is used to identify the pattern of attachment. Questionnaires were directed to 165 respondents and in depth interview were done to 18 street vendors and shop owner. Observation through photographic and written documents of physical features and activities were executed. The findings indicate that the pattern of functional and emotional arises from several indicators which are important for maintain the place attachment. © 2016 Penerbit UTM Press. All rights reserved.

Hosseini S.,University Putra Malaysia | Choong T.S.Y.,University Putra Malaysia | Hamid M.,University Putra Malaysia | Hamid M.,Malikussaleh University
Desalination and Water Treatment | Year: 2012

A carbon-based honeycomb monolith was prepared using dip-coating method. The carbon-based monolith was then used to remove a cationic dye (methylene blue [MB]) from aqueous solution. Surface chemistry studies demonstrated that acidic functionality (0.567 mmol g -1) dominated as compared to basic functionality (0.019 mmol g -1). N2 adsorption/desorption revealed a mesoporous structure. The Brunauer-Emmett-Teller surface area was approximately 352 m-2 g -1 and the mesoporous volume devoted about 67% the total pore volume. The effects of different parameters (such as initial pH, initial dye concentration, temperature, and contact time) on MB removal were investigated in batch mode. The maximum adsorption capacity is around 121.3 mg g -1 at optimum pH = 10. An increase in adsorption capacity was observed via increasing MB concentration, with equilibration time ranged between 3,200 and 4,000 min. Both the Langmuir and the Redlich-Peterson models were found to describe well the equilibrium data. Kinetic studies showed better fitting for the pseudo-second-order model. The intraparticle diffusion model showed multilinearity, indicating two or more steps were involved to describe the adsorption process. Regeneration studies showed that the adsorption capacity of the adsorbent was reduced by about 20% after six cycles. © 2012 Desalination Publications. All rights reserved.

Muhammad,University Putra Malaysia | Muhammad,Malikussaleh University | Chuaha T.G.,University Putra Malaysia | Robiaha Y.,University Putra Malaysia | And 2 more authors.
Desalination and Water Treatment | Year: 2011

A batch adsorption study was conducted to investigate the suitability of palm kernel shell (PKS)- based activated carbon for the removal of cadmium and zinc ions from aqueous solutions. Single component equilibrium data were analyzed using the Langmuir, Freundlich and Redlich-Peterson isotherms. Overall, the Redlich-Peterson isotherm showed the best fit for all adsorption under investigation. As the binary adsorption is competitive, the extended Langmuir (EL) model couldnot predict well the binary component isotherm. Three correlative models, the modified extended Langmuir (MEL), modified extended Freundlich (MEF) and modified extended Redlich-Peterson (MERP) models were used to fit binary system equilibrium data. It was found that the binary isotherm data could be described well by the modified extended Langmuir model. © 2011 Desalination Publications. All rights reserved.

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