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Research progress in friction stir processing of magnesium alloys and their metal matrix surface composites: Evolution in the 21^(st )century

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Journal of Magnesium and Alloys 2024年第6期12卷 2091-2146页

作者： Roshan Vijay Marode Tamiru Alemu Lemma Nabihah Sallih Srinivasa Rao Pedapati Mokhtar Awang Adeel Hassan Department of Mechanical Engineering Universiti Teknologi PETRONASBandarSeri IskandarPerak 32610Malaysia Department of Mechanical Engineering College of EngineeringThe University of Texas Permian BasinMidland-OdessaUnited States Mechanical Engineering Department Universiti Teknologi BruneiBrunei

Rising concerns about climate change drive the demand for lightweight ***(Mg)alloys are highly valued for their low weight,making them increasingly important in various *** focusing on enhancing the characteristics of Mg alloys and developing their Metal Matrix Composites(MMCs)have gained significant attention worldwide over the past decade,driven by the global shift towards lightweight *** Stir Processing(FSP)has emerged as a promising technique to enhance the properties of Mg alloys and produce ***,FSP adapted to refine grain size from the micro to the nano level and accelerated the development of MMCs due to its solid-state nature and the synergistic effects of microstructure refinement and reinforcement,improving strength,hardness,ductility,wear resistance,corrosion resistance,and fatigue ***,producing defect-free and sound FSPed Mg and Mg-MMCs requires addressing several variables and their interdependencies,which opens up a broad range of practical *** existing reviews on individual FSP of Mg,its alloys,and MMCs,an attempt has been made to analyze the latest research on these three aspects collectively to enhance the understanding,application,and effectiveness of FSP for Mg and its *** review article discusses the literature,classifies the importance of Mg alloys,provides a historical background,and explores developments and potential applications of FSPed Mg *** focuses on novel fabrication methods,reinforcement strategies,machine and tool design parameters,material characterization,and integration with other methods for enhanced *** influence of process parameters and the emergence of defects are examined,along with specific applications in mono and hybrid composites and their microstructure *** study identifies promising reinforcement materials and highlights research gaps in FSP for Mg alloys and MMCs *** conclude

关键词： Magnesium alloys Friction stir processing Metal matrix composites Lightweight Surface modification

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Surface Morphology and Thermo-Electrical Energy Analysis of Polyaniline (PANI) Incorporated Cotton Fabric

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Energy Engineering 2024年第1期121卷 1-12页

作者： Md.Shohan Parvez Md.Mustafizur Rahman Mahendran Samykano Mohammad Yeakub Ali Automotive Engineering Research Group Faculty of Mechanical and Automotive Engineering TechnologyUniversiti Malaysia Pahang Al-Sultan AbdullahPekanMalaysia Department of Textile Engineering Khulna University of Engineering&Technology(KUET)KhulnaBangladesh Centre for Research in Advanced Fluid and Processes(CARIFF) Universiti Malaysia Pahang Al-Sultan AbdullahLebuhraya Tun RazakGambangMalaysia Mechanical Engineering Programme Area Faculty of EngineeringUniversiti Teknologi BruneiBruneiDarussalam

With the exponential development in wearable electronics,a significant paradigm shift is observed from rigid electronics to flexible wearable ***(PANI)is considered as a dominant material in this sector,as it is endowed with the optical properties of both metal and ***,its widespread application got delineated because of its irregular rigid form,level of conductivity,and precise choice of *** PANI in textile materials can generate promising functionality for wearable *** research work employed a straightforward in-situ chemical oxidative polymerization to synthesize PANI on Cotton fabric surfaces with varying dopant(HCl)***-treatment using NaOH is implemented to improve the conductivity of the fabric surface by increasing the monomer *** research explores the morphological and structural analysis employing SEM,FTIR and *** surface resistivity was measured using a digital multimeter,and thermal stability is measured using *** successful polymerization,a homogenous coating layer is *** is revealed that the simple pre-treatment technique significantly reduces the surface resistivity of Cotton fabric to 1.27 kΩ/cm with increasing acid concentration and thermal *** electro-thermal energy can also reach up to 38.2°C within 50 s with a deployed voltage of 15 *** modified fabric is anticipated to be used in thermal regulation,supercapacitor,sensor,UV shielding,antimicrobial and other prospective functional applications.

关键词： Polyaniline cotton in-situ polymerization SEM TGA heating fabric

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Modeling of a long sand-pack for heavy crude oil through depletion tests utilizing methane gas

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Petroleum 2021年第2期7卷 188-198页

作者： Bashir Busahmin Rama Rao Karri Stephen Tyson Morteza Jami Petroleum&Chemical Engineering Universiti Teknologi BruneiBrunei Darussalam

With the enormous increase in the demand for crude oil,and decrease in the resources of conventional oil reservoirs,there is a great need to understand heavy or foamy oil-gas drive mechanism to maximize the oil and gas *** analyze the real movement of non-viscous heavy oil flow,the characteristic features of the oil-gas mixture has to be estimated to forecast the future potential supply from a heavy oil *** important question in heavy oil flow under solution gas drive is whether the behaviour of depletion tests can be simulated to model the heavy oil flow *** main objective of this research is to develop a reliable numerical model for modelling heavy oil flow calibrated with controlled solution gas drive experiments,and that makes a novelty in this *** this paper,CMG-STARS model which is capable of simulating solution gas drive tests that matched the research *** heavy oil recovery model can determine the relative permeability curves for oil and gas in the dualphase system using Corey’s *** a depletion rate of 0.0418 psi/min,the maximum cumulative oil and gas production was observed to be 13,000 cm^(3)and 8500 cm^(3),*** results from the bottom hole pressure and the block pressure simulation runs indicate that the fluid properties such as surface tension plays a significant role in the gas bubble *** results are promising,and helps to understand the complex behaviour of heavy oil reservoirs and thus can improve heavy oil recovery.

关键词： Depletion rate Simulation Gas fluid dual-phase Sand-pack Heavy oil reservoir Methane gas

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Perturbation analysis for pulsatile flow of Carreau fluid through tapered stenotic arteries

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International Journal of Biomathematics 2016年第4期9卷 259-283页

作者： D. S. Sankar Engineering Mathematics UnitFaculty of Engineering Universiti Teknologi Brunei Gadong BEI~IO Brunei Darussalam

The pulsatile flow of blood in a tapered narrow artery with overlapping time-dependent stenosis is mathematically analyzed, modeling blood as Carreau fluid. Perturbation method is employed for solving the resulting nonlinear system of equations along with the appropriate boundary conditions. The analytic solutions to the pressure gradient, velocity distribution, flow rate, wall shear stress and longitudinal impedance to flow are obtained in the asymptotic form. The variation of the aforesaid flow quantities with respect to various physical parameters such as maximum depth of the stenosis, angle of tapering of the artery, power law index, Reynolds number, pulsatile amplitude of the flow and Weissenberg number is investigated. It is found that the wall shear stress and longitudinal impedance to flow increase with the increase of the angle of tapering of the artery, the maximum depth of the stenosis and pulsatile Reynolds number and these decrease with the increase of the amplitude of the flow, power law index and Weissenberg number. The mean velocity of blood decreases significantly with the increase of the artery radius, maximum depth of the stenosis, angle of tapering of the artery.

关键词：狭窄动脉脉动流扰动分析流体锥形纵向阻抗幂律指数雷诺兹数

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A comparative study of adsorption behavior of rifampicin,streptomycin,and ibuprofen contaminants from aqueous solutions onto chitosan:Dynamic interactions,kinetics,diffusions,and mechanisms

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Emerging Contaminants 2023年第1期9卷 20-32页

作者： Ensan Waatriah E.S.Shahrin Nur Alimatul Hakimah Narudin Nurulizzatul Ningsheh MShahri Muhammad Nur Jun-Wei Lim Muhammad Roil Bilad Abdul Hanif Mahadi Jonathan Hobley Anwar Usman Department of Chemistry Faculty of ScienceUniversiti Brunei DarussalamJalan Tungku LinkGadongBE1410Brunei Darussalam Center for Plasma Research Integrated LaboratoryUniversitas DiponegoroTembalangSemarang50275Indonesia HICoE-Centre for Biofuel and Biochemical Research Institute of Self-Sustainable BuildingDepartment of Fundamental and Applied SciencesUniversiti Teknologi PETRONAS32610Seri IskandarPerak Darul RidzuanMalaysia Faculty of Integrated Technologies Jalan Tungku LinkGadongBE1410Brunei Darussalam Centre for Advanced Material and Energy Sciences Universiti Brunei DarussalamJalan Tungku LinkGadongBE1410Brunei Darussalam Department of Biomedical Engineering National Cheng Kung UniversityNo.1 University RoadTainan City 701Taiwan

Adsorptive removal and dynamic interaction of three different pharmaceutical pollutants,namely rifampicin(RIF),streptomycin(STM),and ibuprofen(IBU)onto chitosan were systematically investigated using a batch adsorption technique at different processing *** this study,chitosan was derived from mud-crab shells,as an innovative way to use the waste from marine foods as *** kinetics,intraparticle diffusion,mechanism,and thermodynamics of the adsorption were systematically evaluated and analyzed using kinetic models,Boyd mass transfer and WebereMorris intraparticle diffusion models,Langmuir,Freundlich,DubinineRadushkevich,and Temkin isotherm models,and the Gibbs *** adsorption isotherm of the larger molecules,RIF and STM,could be explained by the Langmuir isotherm model,in contrast,that of IBU,which is a much smaller molecule,followed the Freundlich isotherm *** maximum adsorption capacity of RIF,STM,and IBU on chitosan was estimated to be 66.91 mg g^(-1),11.00 mg g^(-1),and 24.21 mg g^(-1),respectively,which are higher compared to those on a variety of agricultural wastes,suggesting that this biopolymer is a potential practical and economical adsorbent to remove the pharmaceutical compounds from *** adsorption mechanism of the pharmaceutical compounds on chitosan is proposed based on the vibrational spectroscopic analyses,XRD patterns,and DSC thermograms of the biopolymer before and after adsorption process.

关键词： Adsorption Rifampicin Streptomycin Ibuprofen Chitosan Mud-carb shells

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Phylogenetic and morphometric relationships between two species of genus Auxis from the South China Sea and Java Sea

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Acta Oceanologica Sinica 2016年第10期35卷 76-82页

作者： HABIB Ahasan Environmental and Life Sciences Programme Faculty of ScienceUniversiti Brunei DarussalamJalan TungkuGadong BE 1410Brunei Darussalam Department of Fisheries and Marine Science Noakhali Science and Technology UniversitySonapur-3814NoakhaliBangladesh universiti teknologi brunei Jalan TungkuGadong BE 1410Brunei Darussalam

This study was aimed at examining the phylogenetic and morphometric relationship of frigate tuna（Auxis thazard） and bullet tuna（Auxis rochei） using mt DNA D-loop（control） region sequences and truss measurements,respectively. Maximum-likelihood（ML） tree and median-joining network showed that haplotypes from Auxis populations grouped separately. Discriminant function analyses and non-metric multidimensional scaling of morphometric data showed that bullet and frigate tuna were differed mainly with respect to truss measurements on the anterior region, suggesting adaptation to different diets available in different environments. Historic demographic analyses of sequence data showed that both bullet and frigate tuna had not undergone a significant sudden population expansion recently. Non-significant value of Tajimas＇ s D and Fu＇s F_S were indicated an effective large and stable population size for longer period of both species in South China Sea and Java Sea species. This study gives first report on the complementary relationship between morphometric and genetic analysis in stock discrimination of genus Auxis.

关键词： phylogenetic relationship mtDNA D-loop morphometric analysis Auxis thazard Auxis rochei

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Comparative Study on Growth Performance of Transgenic(Over-Expressed OsNHX1) and Wild-Type Nipponbare under Different Salinity Regimes

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Rice science 2015年第6期22卷 275-282页

作者： Nurul Kahrani ISHAK Zohrah SULAIMAN Kushan U.TENNAKOON Environmental and Life Sciences Faculty of ScienceUniversity Brunei Darussalam Institut teknologi brunei

Transgenic Nipponbare which over-expressed a Na＋/H~ antiporter gene OsNHX1 was used to compare its growth performance, water status and photosynthetic efficiency with its wild type under varying salinity regimes. Chlorophyll content, quantum yield and photosynthetic rate were measured to assess the impact of salinity stress on photosynthetic efficiency for transgenic and wild-type Nipponbare. Effects of salinity on water status and gas exchange to both lines were studied by measuring water use efficiency, instantaneous transpiration rate and stomatal conductance. Dry shoot weight and leaf area were determined after three months of growth to assess the impacts of salinity on the growth of those two lines. Our study showed that both lines were affected by salinity stress, however, the transgenic line showed higher photosynthetic efficiency, better utilization of water, and better growth due to low transpiration rate and stomatal conductance. Reduction of photosynthetic efficiency exhibited by the wild-type Nipponbare was correlated to its poor growth under salinity stress.

关键词： growth performance salinity stress Na+/H+ antiporter gene OsNHX1 transgenic rice photosynthetic efficiency water status

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Aggregated impact of allowance allocation and power dispatching on emission reduction

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Journal of Modern Power Systems and Clean Energy 2017年第6期5卷 936-946页

作者： Chao JIANG Yusheng XUE Jie HUANG Feng XUE Fushuan WEN Kang LI Nanjing University of Science and Technology(NJUST) Nanjing 210094China State Grid Electric Power Research Institute(SGEPRI) Nanjing 211000China universiti teknologi brunei(UTB) Brunei MuaraBrunei Queen’s University BelfastUK

Climate change has become one of the most important issues for the sustainable development of social *** has made great efforts in reducing CO2 emissions and promoting clean *** Emission Trading Systems(ETSs)have been launched in two provinces and five cities in China,and a national level ETS will be implemented in the third quarter of 2017,with preparations for China’s national ETS now well under *** the meantime,a new round of China’s electric power system reform has entered the implementation *** variables from both electricity and emission markets willimpose potential risks on the operation of generation companies(Gen Cos).Under this situation,by selecting key variables in each domain,this paper analyzes the combined effects of different allowance allocation methods and power dispatching models on power system *** parameters are set based on a provincial power system in China,and the case studies are conducted based on dynamic simulation platform for macro-energy systems(DSMES)software developed by the *** selected power dispatching models include planned dispatch,energy saving power generation dispatch and economic *** selected initial allowance allocation methods in the emission market include the grandfathering method based on historical emissions and the benchmarking method based on actual *** on the simulation results and discussions,several policy implications are highlighted to help to design an effective emission market in China.

关键词： Emission trading system(ETS) Allowance allocation Power dispatching Generation company Emission reduction

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Investigation of wind energy potentials in brunei Darussalam

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Frontiers in Energy 2019年第4期13卷 731-741页

作者： M.A.SALAM M.G.YAZDANI Q.M.RAHMAN Dk NURUL S.F.MEI Syeed HASAN Faculty of Engineering Universiti Teknologi BE1410Brunei Darussalam Electrical and Computer Engineering University of Western OntarioLondon N6A 3K7Canada

Conventional power generation mainly depends on natural gas and diesel oil in brunei *** power utility company is now thinking of power generation using natural *** this paper,wind energy,being one of the most readily available renewable energy sources,was *** wind characteristic,velocity and directions were studied using Weibull distribution based on the measurement of wind speed at two different locations in brunei *** wind speed distributions were modeled using the Wind Power *** wind rose graph was obtained for the wind direction to analyze the wind power density onshore and *** on this analysis,it has been found that the wind speed of 3 to 5m/s has a probability of occurrence of 40%.Besides,the annual energy production at a wind speed of 5m/s has been found to be in the range between 1000 and 1500 kWh for both the locations in brunei Darussalam.

关键词： wind speed Weibull distribution wind rose wind energy wind power

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Power-to-gas technology in energy systems:current status and prospects of potential operation strategies

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Journal of Modern Power Systems and Clean Energy 2017年第3期5卷 439-450页

作者： Weijia LIU Fushuan WEN Yusheng XUE College of Electrical Engineering Zhejiang UniversityHangzhou 310027China Department of Electrical and Electronic Engineering Universiti Teknologi BruneiBandar Seri Begawan BE1410Negara Brunei Darussalam State Grid Electric Power Research Institute Nanjing 210003China

Regarded as a long-term, large capacity energy storage solution, commercialized power-to-gas(PtG) technology has attracted much research attention in recent *** plants and natural gas-fired power plants can form a close loop between an electric power system and a natural gas network. An interconnected multi-energy system is believed to be a solution to the future efficient and environmental friendly energy systems. However, some crucial issues require in-depth analysis before PtG plants can be economically implemented. This paper discusses current development status and potential application of PtG plants in the future interconnected multi-energy systems, and further analyzes the costs and benefits of PtG plants in different application scenarios. In general, the PtG plants are not economical efficient based on current technologies and costs. But the situation is likely to change with the development of PtG technologies and interconnected operation of gas-electricity energy system.

关键词： Power to gas Energy storage Power system economics Electricity market Renewable energy Multienergy system

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