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Peat properties of a tropical forest reserve adjacent to a fire-break canal

Journal of Forestry Research 2024年第1期35卷 155-167页

作者： Dayang Nur Sakinah Musa Mohd Zahirasri Mohd Tohir Xinyan Huang luqman chuah abdullah Mohamad Syazaruddin Md Said Muhammad Firdaus Sulaiman Safety Engineering Interest Group(SEIG) Department of Chemical and Environmental EngineeringFaculty of EngineeringUniversiti Putra Malaysia43400 UPM SerdangSelangorMalaysia International Tropical Forestry Programme Faculty of Tropical ForestryUniversiti Malaysia SabahSabahMalaysia Department of Land Management Faculty of AgricultureUniversiti Putra MalaysiaSelangorMalaysia Research Centre for Fire Safety Engineering Department of Building Environment and Energy EngineeringThe Hong Kong Polytechnic UniversityHong KongPeople’s Republic of China

Tropical peat comprises decomposed dead plant material and acts like a sponge to absorb water,making it fully ***,drought periods dry it readily and increases its vulnerability to *** fires emit greenhouse gases and particles contributing to haze,and prevention by constructing fire-break canals to reduce fire spread into forest reserves is *** paper aims to determine peat physical and chemical properties near a fire-break canal at different fire frequency *** sampling was conducted at two forest reserves in Malaysia which represent low fire frequency and high fire frequency *** results show that peat properties were not affected by the construction of a fire-break canal,however lignin and cellulose content increased significantly from the distance of the canal in both *** study concluded that fire frequency did not significantly influence peat properties except for *** higher fibre content in the high frequency area did not influence moisture content nor the ability to regain ***,fire frequency might contribute differently to changes in physical and chemical properties,hence management efforts to construct fire-break canals and restoration efforts should protect peatlands from further *** findings will benefit future management and planning for forest reserves.

关键词： Peat fire Peat properties Fire-break canals Forest reserves

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A facile and green synthetic approach toward fabrication of starch-stabilized magnetite nanoparticles

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Chinese Chemical Letters 2017年第7期28卷 1590-1596页

作者： Nurul Hidayah abdullah Kamyar Shameli Ezzat Chan abdullah luqman chuah abdullah Department of Environmental Engineering and Green Technology (EGT) Malaysia-Japan International Institute of Technology (MJIIT) Universiti Teknologi Malaysia (UTM) Department of Chemical and Environmental Engineering Faculty of Engineering Universiti Putra Malaysia

A facile and green synthetic approach for fabrication of starch-stabilized magnetite nanoparticles was implemented at moderate temperature. This synthesis involved the use of iron salts, potato starch,sodium hydroxide and deionized water as iron precursors, stabilizer, reducing agent and solvent respectively. The nanoparticles（NPs） were characterized by UV-vis, PXRD, HR-TEM, FESEM, EDX, VSM and FT-IR spectroscopy. The ultrasonic assisted co-precipitation technique provides well formation of highly distributed starch/Fe3O4-NPs. Based on UV–vis analysis, the sample showed the characteristic of surface plasmon resonance in the presence of Fe3O4-NPs. The PXRD pattern depicted the characteristic of the cubic lattice structure of Fe3O4-NPs. HR-TEM analysis showed the good dispersion of NPs with a mean diameter and standard deviation of 10.68 4.207 nm. The d spacing measured from the lattice images were found to be around 0.30 nm and 0.52 nm attributed to the Fe3O4 and starch, respectively. FESEM analysis confirmed the formation of spherical starch/Fe3O4-NPs with the emission of elements of C, O and Fe by EDX analysis. The magnetic properties illustrated by VSM analysis indicated that the as synthesized sample has a saturation magnetization and coercivity of 5.30 emu/g and 22.898 G ***, the FTIR analysis confirmed the binding of starch with Fe3O4-NPs. This method was cost effective, facile and eco-friendly alternative for preparation of NPs.

关键词： Nanoparticles Fe3O4 Starch Magnetic properties Vibrating sample magnetometer

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The flow behavior of powder stearin-based methyl ester sulfonates and the effect of glidant

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Particuology 2023年第9期80卷 148-156页

作者： Zulina Abd Maurad luqman chuah abdullah Mohd Shamsul Anuar Nor Nadiah Abdul Karim Shah Zainab Idris Malaysian Palm Oil Board 6Persiaran InstitusiBandar Baru Bangi43000SelangorMalaysia Department of Chemical and Environmental Engineering Faculty of EngineeringUniversiti Putra MalaysiaSerdangSelangor43400Malaysia Department of Process and Food Technology Faculty of EngineeringUniversiti Putra MalaysiaSerdangSelangor43400Malaysia

The preparation and behavior of powder stearin-based methyl ester sulfonates(MES)with the addition of builder as a glidant agent was *** is an anionic surfactant and its performance is equivalent to petroleum-based linear alkylbenzene sulfonates(LAS),the workhorses of the detergent *** the same time,zeolites or soda ash were the alternative builders for non-phosphate-based *** behavior of powder MES properties was measured in terms of morphology,particle size,cohesion,caking,and *** that,these palm stearin-based MES of carbon chain 16–18 with ratios of 98:2,80:20,and 60:40 in flakes were ground using a high shear mixer by 23,000 rpm to produce powder *** the particle size of MES powder can reduce the powder's cohesion,caking,and *** addition of zeolite or soda ash as a glidant in powdered MES can improve the caking *** high stearic in MES greatly influenced getting fine particle powders and required more glidant *** powder MES with excellent powder characteristics can perform well as a bio-based cleaning product.

关键词： Methyl ester sulfonates Caking Compaction Cohesion Glidant

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OPTICAL BAND GAP AND CONDUCTIVITY MEASUREMENTS OF POLYPYRROLE-CHITOSAN COMPOSITE THIN FILMS

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Chinese Journal of Polymer Science 2012年第1期30卷 93-100页

作者： Mahnaz M.Abdi H.N.M.Ekramul Mahmud luqman chuah abdullah Anuar Kassim Mohamad Zaki Ab.Rahman Josephine Liew Ying Chyi Laboratory of Biopolymer and Derivatives Institute of Tropical Forestry and Forest Products(INTROP) Universiti Putra Malaysia43400 SerdangSelangorMalaysia Department of Chemistry Faculty of Science University of Malaya50603Kuala LumpurMalaysia Department of Chemistry Faculty of Science Universiti Putra Malaysia43400 SerdangSelangorMalaysia Department of Physics Faculty of Science Universiti Putra Malaysia43400 SerdangSelangorMalaysia

Electrical conductivity and optical properties of polypyrrole-chitosan（PPy-CHI） conducting polymer composites have been investigated to determine the optical transition characteristics and energy band gap of composite *** two electrode method and I-V characteristic technique were used to measure the conductivity of the PPy-CHI thin films,and the optical band gap was obtained from their ultraviolet absorption *** upon experimental parameter,the optical band gap（E_g） was found within 1.30-2.32 eV as estimated from optical absorption *** band gap of the composite films decreased as the CHI content *** room temperature electrical conductivity of PPy-CHI thin films was found in the range of 5.84×10^（-7）-15.25×10^（-7） S·cm^（-1） depending on the chitosan *** thermogravimetry analysis（TGA） showed that the CHI can improve the thermal stability of PPy-CHI composite films.

关键词： Polymer composite Electron transition I-V characteristic technique Optical band gap Polypyrrole

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Impacts of different drying strategies on drying characteristics,the retention of bio-active ingredient and colour changes of dried Roselle

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Chinese Journal of Chemical Engineering 2018年第2期26卷 303-316页

作者： Thing Chai Tham Mei Xiang Ng Shu Hui Gan Lee Suan Chua Ramlan Aziz luqman chuah abdullah Sze Pheng Ong Nyuk Ling Chin Chung Lim Law Department of Chemical Engineering The University of Nottingham Malaysia CampusJaian Broga43500 SemenyihSelangor D.E.Malaysia Institute of Bioproduct Development Universiti Teknologi MalaysiaUTMJohor Bahru81310 SkudaiMalaysia Department of Chemical and Environmental Engineering Universiti Putra Malaysia UPM43400 SerdangSelangorMalaysia Department of Process and Food Engineering Universiti Putra Malaysia UPM43400 SerdangSelangorMalaysia

The drying kinetics of Roselle （Hibiscus sabdariffa L） of variety Terengganu （UMKL-1） and the quality attribution of Roselle were studied. The experiments were conducted using four different drying methods, including solar greenhouse drying （SD）, solar greenhouse with intermittent heat pump drying （SIHP）, hot air drying （HA） and heat pump drying （HP）. Among the four drying methods, HP achieved the highest drying rate at a range from 0.054 g H20-（g DM）-1. rain-1 to 0.212 g H20-（g DM）-1. rain 1 while SD had the lowest drying rate, measured at 0.042 g H2O. （g DM） ***- 1. The analysis on colour kinetics revealed that there is no significant colour loss （p 〉 0.05） observed from HP＇s dried Roselle. Greater amount of flavonoid compounds i.e. protocatechuic acid was found in SD and SIHP dried finished product whereas HP＇s dried Roselle contains higher percentage of catechin as compared to other drying methods.

关键词： Hibiscus sabdariffa L.Drying Heat pump Total colour change Protocatechuic acid Catechin

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Peat properties of a tropical forest reserve adjacent to a fire-break canal

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林业研究（英文版） 2024年第1期 159页

作者： Dayang Nur Sakinah Musa Mohd Zahirasri Mohd Tohir Xinyan Huang luqman chuah abdullah Mohamad Syazaruddin Md Said Muhammad Firdaus Sulaiman

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Short-Term Field Decomposition and Physico-Chemical Transformation of Jatropha Pod Biochar in Acidic Mineral Soil

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Open Journal of Soil Science 2014年第7期4卷 226-234页

作者： Cheah Poh Meng Ahmad Husni Mohd Hanif Samsuri Abd Wahid luqman chuah abdullah Department of Chemical Engineering Faculty of Engineering Universiti Putra Malaysia Serdang Malaysia Department of Land Management Faculty of Agriculture Universiti Putra Malaysia Serdang Malaysia

Details regarding field decomposition and transformation of biochar in Malaysia are scarce. The objectives of this study were to investigate the physico-chemical changes experienced by Jatropha pod biochar (JPB) in acidic mineral soil under field condition. Elemental composition was determined using CHNS-O analyzer and surface area with Brunauer-Emmett-Teller (BET) method. The JPB surface chemistry and structure were studied using the Fourier Transform Infrared (FTIR) spectroscopy and 13C solid state Nuclear Magnetic Resonance (NMR) spectroscopy, respectively. The JPB short-term decomposition was investigated by using a litter bag study and decomposition data were best fitted by a hyperbolic decay model compared to an exponential decay model because no significant dry weight loss was detected after 4 months. Two phases (volatile and near stagnant) were detected for JPB field decomposition. The volatile phase was due to rapid loss of labile fraction such as carbohydrate during the initial 4 months. The near stagnant phase was probably due to adsorption of organic matter and soil minerals. The JPB was fragmented into smaller pieces, encouraging surface adsorption. Redox reaction was prominent as shown by the production of hydroxyl, carboxylic and phenolic functional groups. The JPB became more recalcitrant after 12 months of application to the soils.

关键词： Litter Bag Study Redox FTIR NMR Hyperbolic Decay Model

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Fractionation of Palm Kernel Oil by Short Path Distillation

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Journal of Food Science and Engineering 2014年第2期4卷 82-95页

作者： Muhamad Roddy Ramli Siew Wai Lin luqman chuah abdullah Thomas Choong Shean Yaw Protein and Food Technology Unit Malaysian Palm Oil Board Kajang 43000 Selangor D.E. Malaysia Department of Chemical and Environmental Engineering faculty of Engineering Universiti Putra Malaysia Serdang 43400Selangor D.E. Malaysia INTROP Universiti Putra Malaysia Serdang 43400 Selangor D.E. Malaysia

Fractionation of palm kernel oil （PKO） by short path distillation （SPD） at two feed flow rates （135 g/h and 195 g/h） and six distillation temperatures, TD,s （200, 210, 220, 230, 240 and 250 ℃） was investigated. Other distillation parameters, such as vacuum pressure （0.001 mbar）, blade rotation speed （400 rpm） and temperature of the feed material （60 ℃） were kept constant. The fractionated products, known as residue and distillate, were analysed for physico-chemical properties including fatty acid composition （FAC）, triacylglycerol （TAG） composition, slip melting point （SMP）, thermal analysis by differential scanning calorimetry （DSC） and solid fat content （SFC）. Product yield was measured as well. Crystallisation behaviour of PKO and the fractionated products were studied by measurement of isothermal crystallisation, Tc,. at 0, 5, 10, 15, 20 and 25 ℃. The distillates, collected at all fractionation temperatures, were enriched with caprylic, capric and lauric acids. These fractions were also concentrated with low molecular weight and C36 TAGs. Distillates obtained at higher TDis （230-250 ℃） exhibited higher in SMP and SFC. On the other hand, the residual oils collected at all fractionation temperatures contained higher amount of long-chain fatty acid and palmitic acid. These fractions were enriched with high molecular weight TAGs. Residues obtained at lower Tois （200-220 ℃） were low in SMP and comparable SFC with PKO. Changes in fatty acid and TAG composition resulted in different crystallisation behaviour of the fractions. Distillates collected at all fractionation temperatures crystallised in a sharper peak while residues obtained at higher T Dis （230-250 ℃） showed broader crystallisation peaks, as shown by the DSC thermograms.

关键词： Palm kernel oil short path distillation palm kernel distillates palm kernel residues crystallisation behaviours.

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Overview on Application of Response Surface Methodology （RSM） in Treatment of Palm Oil Mill Effluent （POME）

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Journal of Environmental Science and Engineering(B) 2015年第3期4卷 111-118页

作者： Mohd Azwan Ahmad luqman chuah abdullah Thomas Choong Shean Yax~ Abdul Wahab Mohammad Department of Chemical & Environmental Engineering Faculty of Engineering University Putra Malaysia Serdang 43400 Malaysia Department of Chemical & Process Engineering Faculty of Engineering University Kebangsaan Malaysia Bangi 43650 Malaysia

There are many factors affecting the performance of a treatment system especially in the treatment of palm oil mill effluent （POME） as its contains high amounts of suspended solid, low pH, high salt content and high chemical oxygen demand （COD）. However, one factor at a time approach is complicated method in establishing relationship between multiple parameters. Response surface methodology （RSM） is a recommended approach as it is widely used to analyze and study the interactions between multiple parameters and provides optimum output as well as minimizing the defects which result in good treatment system. This paper overviews the recent and current research in the application of RSM in optimizing the treatment development of POME.

关键词： Palm oil mill effluent (POME) multiple parameters response surface methodology (RSM).

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Exergy Simulation of Methane Gas Combustion and Gasification

Exergy Simulation of Methane Gas Combustion and Gasification

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2009'全国可再生能源—生物质能利用技术交流研讨会

作者： luqman chuah abdullah Mohd Shahwahid B Hj Othman H'ng Paik San Institute of Tropical Forestry and Forest Product University of Putra Malaysia

Current energy evaluation focuses on the substitution of non renewable resources mainly fossil fuels but it lacks in justification that how efficient and sustainable the so-called renewable energy will *** gap is how much will it be more efficient by using renewable feedstock and renewable technology than using the traditional feedstock and traditional *** paper gives the thermodynamic analysis by using methane gas through combustion and gasification to find out the exergy balance under different temperature and *** this way,a clearer mind of how much energy efficiency is by using gasification and combustion can be *** is found that the higher temperature isobaricly the higher thermal efficiency and the higher pressure isothermally the higher thermal *** is also found that the exergy out of the gasification is higher than that *** is mostly contributed to the formation of carbon monoxide and hydrogen in the gasification stream.

关键词： energy evaluation thermodynamic exergy balance thermal efficiency

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