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Frontiers of Architectural Research 2014年第3期3卷 283-297页

作者： Karam M.Al-Obaidi Mazran Ismail abdul malek abdul rahman School of Housing Building and PlanningUniversiti Sains Malaysia

Cooling is one of the major concerns in building tropical *** problem is exacerbated by the heat gain of the roof,which constitutes 70%of the total heat *** passive cooling technique is one of the innovative practices and technologies that provide buildings with comfortable conditions through natural *** and radiative processes are the methods used to decrease heat gain by facilitating the elimination of excess heat in a building's interior to maintain a comfortable *** that the potential of these techniques vary from region to region,their application in the tropics should be *** these approaches in detail allows us to rethink how to effectively adapt these techniques to overcome the build-up of heat in modern tropical houses in Southeast *** study reviews the physical characteristics of these approaches to guide architects and building *** indicate a great reduction in operational ***,the significant differences in the performance of colour and material properties should be considered,given that the selected approach strongly affects the required thermal conditions of a building.

关键词： Passive cooling Reflective roof Radiative roof Southeast Asia Tropical houses

A study of the impact of environmental loads that penetrate a passive skylight roofing system in Malaysian buildings

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Frontiers of Architectural Research 2014年第2期3卷 178-191页

作者： Karam M. Al-Obaidi Mazran Ismail abdul malek abdul rahman School of Housing Building & Planning Universiti Sains Malaysia Penang 11800 Malaysia

A passive skylight system is a significant building design element that provides an ideal condition for interior spaces. However, the use of this system is limited to specific climatic regions because of its considerable effect on the indoor environment. Malaysia is a tropical country that has favorable natural benefits, such as solar geometry and natural light, which can brighten building interiors throughout the year. However, harnessing this benefit affects spaces, especially those in single-story buildings, because of excessive natural loads. This study reviews a concept to understand the passive behavior of solar radiation in the form of light and heat that falls on, interacts with, and is emitted from a skylight system in a single-story building. The study method is theoretically based on descriptive analysis to assess design requirements. The review shows that designs grounded on the physical aspects of climate （influenced variables）, materials （design variables）, and human comfort （affected variables） in one process （ESI） can develop the architectural way of thinking rather than estimate the condition based on a limited perspective. This assumption indicates that the adoption of this concept in the preliminary design stage will enable designers to balance the building environment effectively.

关键词： Skylight system Tropics Solar radiation Light Heat Malaysian builtenvironment

Passive coolin8 techniques throush reflective and radiative roofs in tropical houses in Southeast Asia： A literature review

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Frontiers of Architectural Research 2014年第3期3卷 283-297页

作者： Karam M. AI-Obaidi Mazran Ismail abdul malek abdul rahman School of Housing Building and Planning Universiti Sains Malaysia Penang 11800 Malaysia

Cooling is one of the major concerns in building tropical houses. This problem is exacerbated by the heat gain of the roof, which constitutes 70% of the total heat gain. The passive cooling technique is one of the innovative practices and technologies that provide buildings with comfortable conditions through natural means. Reflective and radiative processes are the methods used to decrease heat gain by facilitating the elimination of excess heat in a bui[ding＇s interior to maintain a comfortable environment. Given that the potential of these techniques vary from region to region, their application in the tropics should be examined. Exploring these approaches in detail allows us to rethink how to effectively adapt these techniques to overcome the build-up of heat in modern tropical houses in Southeast Asia. This study reviews the physical characteristics of these approaches to guide architects and building designers. Results indicate a great reduction in operational cost. However, the significant differences in the performance of colour and material properties shoutd be considered, given that the selected approach strongly affects the required thermal conditions of a building.

关键词： Passive cooling Reflective roof Radiative roof Southeast Asia Tropical houses

Sustainable food waste management using modified fuzzy improved analytic hierarchy process:a study of Malaysia

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Waste Disposal and Sustainable Energy 2024年第1期6卷 63-84页

作者： Chun Yuan Choo Syariza abdul-rahman abdul malek Yaakob Emy E.A-Jalil Department of Decision Science School of Quantitative SciencesUniversiti Utara Malaysia06010SintokKedahMalaysia Institute of Strategic Industrial Decision Modeling School of Quantitative SciencesCollege of Arts and SciencesUniversiti Utara Malaysia06010SintokKedahMalaysia Technology and Supply Chain Excellence Institute School of Technology Management and LogisticsUniversiti Utara Malaysia06010SintokKedahMalaysia

Food waste generation is a pressing issue that requires urgent attention and concerted efforts *** staggering amount of food wasted each year not only wastes valuable resources but also exacerbates environmental,economic,and social *** Waste Management(FWM)consists of a complex array of criteria and sub-criteria,and treatments which seems *** is a need to evaluate the FWM with the help of important criteria and sub-criteria and treatments to address this *** this study,we identified four important criteria,21 sub-criteria,and four alternatives of FWM for the case of Malaysia using the integrated approach of literature review and expert ***,we employed the approach of Modified Fuzzy Improved Analytical Hierarchy Process(IAHP)to corroborate the interrelationships among the identified criteria and sub-criteria,and their associated *** study undertakes linear normalization methods to transform data into comparable numerical values and the Geometric Mean method to handle uncertainty in human ***,the Centroid method is employed to convert fuzzy weights into crisp sets for ease of *** results indicate that environmental is the most essential criterion,followed by social,economic,and *** addition,air and water pollution is identified as the most critical *** Soldier Fly is discovered as the most sustainable FWM treatment,since it performs the best while meeting all the criteria and sub-criteria *** analysis demonstrates that the outputs from the proposed method are robust and *** finding suggests a proper and robust approach to help decision-makers select suitable FWM treatments to tackle various criteria and alternatives especially when handling inconsistent and uncertain judgments during evaluation.

关键词： Multi-criteria decision-making Sustainable food waste management Improved Analytical Hierarchy Process Fuzzy method Sensitivity analysis

Parametric study and effect of calcination and carbonation conditions on the CO_2 capture performance of lithium orthosilicate sorbent

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Chinese Journal of Chemical Engineering 2018年第3期26卷 631-641页

作者： Nurul Azrin Zubbri abdul rahman Mohamed Maedeh Mohammadi Low Carbon Economy (LCE) Research Group School of Chemical Engineering Engineering Campus Universiti Sains Malaysia Faculty of Chemical Engineering Babol Noushirvani University of Technology

The world is currently facing the challenges of global warming and climate change. Numerous efforts have been taken to mitigate CO2 emission, among which is the use of solid sorbents for CO2 capture. In this work, Li4SiO4 was synthesised via a sol-gel method using lithium nitrate （LiNO3） and tetraethylorthosilicate （SiC8H20O4） as precursors. A parametric study of Li：Si molar ratio （1-5）, calcination temperature （600-800℃） and calcination time （1-8 h） were conducted during sorbent synthesis. Calcination temperature （700-800℃） and carbonation temperature （500-700℃） during CO2 sorption activity were also varied to confirm the optimum operating temperature. Sorbent with the highest CO2 sorption capacity was finally introduced to several cyclic tests to study the durability of the sorbent through 10 cycles of CO2 sorption-desorption test. The results showed that the calcination temperature of 800℃ and carbonation temperature of 700℃ were the best operating temperatures, with CO2 sorption capacity of 7.95 mmol CO2·（g sorbent）^-1 （93% of the theoretical yield）. Throughout the ten cyclic processes, CO2 sorption capacity of the sorbent had dropped approximately 16.2% from the first to the tenth cycle, which was a reasonable decline. Thus, it was concluded that Li4SiO4 is a potential CO2 solid sorbent for high temperature CO2 capture activity.

关键词： CO2 capture Adsorption Carbon dioxide Lithium orthosilicate Sol-gel Sorption-desorption

Theoretical investigation of the pressure broadening D1 and D2 lines of cesium atoms colliding with ground-state helium atoms

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Chinese Physics B 2019年第10期28卷 300-308页

作者： Moussaoui Abdelaziz Alioua Kamel Allouche abdul-rahman Bouledroua Moncef Universite Cherif Messaidia B.P.1553Souk-Ahras 41000Algerie Laboratoire de Physique de la Matiere et du Rayonnement LPMR Universite Cherif MessaidiaB.P.1553Souk-Ahras 41000Algerie Universite Lyon 1 CNRSLASIM UMR5579bat.A.Kastler43 Bd du 11 novembre 1918F-69622 VilleurbanneFrance Laboratoire de Physique des Rayonnements LPR Universite Badji MokhtarB.P.12Annaba 23000Algerie

Full quantum mechanical calculations are performed to determine the broadening in the far wings of the cesium D1 and D2 line shapes arising from elastic collisions of Cs atom with inert helium atoms. The potential energy curves of the low-lying CsHe molecular states, as well as the related transition dipole moments, are carefully computed from ab initio methods based on state-averaged complete active space self-consistent field-multireference configuration interaction(SACASSCF-MRCI) calculations, involving the spin-orbit effect, and taking into account the Davidson and BSSE *** absorption and emission reduced coefficients are determined in the temperature and wavelength ranges of 323-3000 K and 800-1000 nm, respectively. Both profiles of the absorption and the emission are dominated by the free-free transitions,and exhibit a satellite peak in the blue wing near the wavelength 825 nm, attributed to B^2Σ1/2^+→ X^2Σ1/2^+/transitions. The results are in good agreement with previous experimental and theoretical works.

关键词： absorption coefficient emission coefficient pressure broadening potential curves

A parametric study of methane decomposition into carbon nanotubes over 8Co-2Mo/Al_2O_3 catalyst

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Journal of Natural Gas Chemistry 2011年第1期20卷 84-89页

作者： Siang-Piao Chai Choon-Ming Seah abdul rahman Mohamed School of Engineering Monash UniversityJalan Lagoon Selatan School of Chemical Engineering Engineering Campus University Sains Malaysia Seri Ampangan

The effects of reaction temperature, partial pressure of methane, catalyst weight and gas hourly space velocity （GHSV） on methane decomposition were reported. The decomposition reaction was performed in a vertical fixed-bed reactor over 8Co-2Mo/Al 2 O 3 catalyst. The experimental results show that these four process parameters studied had vital effects on carbon yield. As revealed by the electron microscopy and Raman spectroscopy analyses, the reaction temperature and GHSV governed the average diameter, the diameter distribution and the degree of graphitization of the synthesized carbon nanotubes （CNTs）. Also, an evidence is presented to show that higher temperatures and higher GHSV favored the formation of better-graphitized CNTs with larger diameters.

关键词： methane chemical vapor deposition Co-Mo/Al 2 O 3 carbon nanotubes parametric study

Generalization of buildings within the framework of CityGML

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Geo-Spatial Information Science 2013年第4期16卷 247-255页

作者： Siddique Ullah BAIG Alias abdul-rahman Faculty of Geoinformation Science and Real Estate Department of GeoinformaticsUniversiti Teknologi MalaysiaUTM Skudai 81310Johor BahruMalaysia

For a better visual impression,3D information systems and architecture need detailed,photo-realistic visualization of 3D ***,easy accessibility with efficient rendering becomes difficult due to the detailed data associated with 3D ***,different applications demand different levels of detail(LoD).Currently,City Geography Markup Language(CityGML),as the Open Geospatial Consortium standard,is being used to model and represent buildings in different LoDs(LoD0–LoD4),but it does not provide methods to generate different LoDs ***,generalized(abstracted)3D scenes of buildings need to be generated to fulfill the demands of task-specific applications by reducing data *** paper discusses various ways to generalize building models,within the framework of CityGML,reducing the level of detail from higher LoD to *** LoD4 data is parsed and *** heuristics are applied to simplify the ground plan and the results are then *** minimum length of an edge for simplification is restricted to the CityGML generalization specifications provided and is characterized by differing accuracies and minimal dimensions of objects for LoD1 and *** could maintain the accuracy of generalized objects and avoid the elimination or merging of important ***,the heights of the walls of the simplified ground plans are raised with the aim to construct simplified 3D building *** for simplification and aggregation aiming to derive LoD2 and LoD1 are implemented and tested on a number of buildings of Putrajaya,*** experiment results show that the minimum length of edges to be simplified is inversely proportional to the size of generalized models.

关键词： CityGML 3D simplification aggregation city models

Risk Assessment of Metal Contamination in Soil and Groundwater in Asia： A Review of Recent Trends as well as Existing Environmental Laws and Regulations

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Pedosphere 2016年第4期26卷 431-450页

作者： Tianlik TEH Nik abdul rahman NIK NORULAINI Mohammad SHAHADAT Yoonsing WONG abdul Kadir MOHD OMAR Department of Environmental Technology School of Industrial Technology Universiti Sains Malaysia 11800 Penang School of Distance Education Universiti Sains Malaysia 11800 Penang

Asia is experiencing a more rapid economic growth compared to any other regions. The contamination of soil and groundwater with metals can mainly be attributed to human activities; therefore, risk assessments to characterize the nature and magnitude of risks to humans and ecological receptors from contaminants are important. Risk assessments are often iterative processes, which involve identification and filling data gap. Experimental samplings, geostatistical and multivariate statistical methods as well as multimedia risk assessment modeling are the three major methodologies used in the assessment of metal contamination in soil and *** review highlights a number of measurements for improving risk calculation methods and expounds scientific approaches that involve the identification of the major source of contamination, exposure pathways and bioavailability of metals. In general, risk assessments of metals in soil and groundwater worldwide are mainly focused on the levels of contamination, identification of exposure pathways, and prediction of the probability of contamination. To date, very limited studies have reported the development of relevant environmental laws and policies in the regulation of soil and groundwater contamination in Asia. The development, variations and limitations in the regulations of soil and groundwater contamination among developed countries may provide helpful guidance for the developing countries in Asia.

关键词： bioavailability of metals environmental regulation exposure pathway levels of contamination source of contamination

Climate change impact assessment on three major crops in the north-central region of Bangladesh using DSSAT

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International Journal of Agricultural and Biological Engineering 2018年第4期11卷 135-143页

作者： Atikur rahman Mohammad abdul Mojid Selina Banu Department of Irrigation and Water Management Bangladesh Agricultural UniversityMymensingh-2202Bangladesh Department of Agricultural and Industrial Engineering Hajee Mohammad Danesh Science and Technology UniversityDinajpur-5200Bangladesh

The potential consequences of climate change emanated from global warming are very alarming;the greatest concern is the potentially disastrous consequences on crop agriculture and food security in many parts of the *** is a country highly susceptible to climate change,but information in this regard is still *** study investigated the effects of climate change on three major crops-wheat,potato and rice-in the north-central region of *** climate change scenarios,A2 and B2,of the Intergovernmental Panel on Climate Change(IPCC)were generated by employing MAGICC/SCENGEN model together with the observed climate data of the *** growth and yield of the crops were simulated using DSSAT CERES-Wheat,SUBSTOR-Potato and CERES-Rice models under the present and projected future changing climatic *** a predicted 5.32℃ increase in temperature in the year 2100,the yield of wheat,rice and potato would decrease by 47.6%,67.8%and 38.6%,*** increased temperature would accelerate physiological maturity of the crops as reflected by their reduced length of growing season(LGS)by 1.20%to 18.5%.The reduced LGS would reduce seasonal evapotranspiration(ET)of the crops by shortening time-span for ET *** to dominant yield reduction over ET reduction,the water use efficiency(WUE)for grain/tuber and biomass yields would decrease with the changing *** reduced crop yields are an indicative of a potential future risk of food security in *** results of this study can therefore guide to adopt coping mechanisms in the light of climate change to ensure future food security of the country.

关键词： climate change DSSAT MAGICC/SCENGEN model CERES model SUBSTOR model growing season length crop-water use