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Recent advances and influencing parameters in developing electrode materials for symmetrical solid oxide fuel cells

矿物冶金与材料学报:英文版 2023年第10期30卷 1933-1956页

作者： Wan nor Anasuhah Wan Yusoff Nurul Akidah Baharuddin Mahendra Rao Somalu Andanastuti Muchtar Nigel P.Brandon Huiqing Fan Solid Oxide Fuel Cell Group Fuel Cell InstituteUniversiti Kebangsaan Malaysia43600UKM BangiSelangorMalaysia Department of Mechanical and Manufacturing Engineering Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan Malaysia43600UKM BangiSelangorMalaysia Faculty of Engineering 2.06 Faculty BuildingImperial College LondonSW72 AZUK State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China

This article delivers a robust overview of potential electrode materials for use in symmetrical solid oxide fuel cells(S-SOFCs),a relatively new SOFC *** this end,this article provides a comprehensive review of recent advances and progress in electrode materials for S-SOFC,discussing both the selection of materials and the challenges that come with making that *** article discussed the relevant factors involved in developing electrodes with nano/***,e.g.,non-cobalt and lithiated materials,are only a few of the electrode types now being ***,the phase structure and microstructure of the produced materials are heavily influenced by the synthesis *** into the possibilities and difficulties of the material are *** achieve the desired microstructural features,this article focuses on a synthesis technique that is either the most recent or a better iteration of an existing *** portion of this analysis that addresses the risks associated with manufacturing and the challenges posed by materials when fabricating S-SOFCs is the most *** article also provides important and useful recommendations for the strategic design of electrode materials researchers.

关键词： nano composites electrode microstructure tailoring oxidation symmetrical solid oxide fuel cell

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Effects of electron radiation on commercial power MOSFET with buck converter application

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Nuclear Science and Techniques 2017年第3期28卷 30-34页

作者： Sheik Fareed Ookar Abubakkar nor Farahidah Zabah Yusof Abdullah Dhiyauddin Ahmad Fauzi norasmahan Muridan Nurul Fadzlin Hasbullah Department of Electrical and Computer Engineering International Islamic University Kuala Lumpur 53100Malaysia Industrial Technology Division Agency Nuclear MalaysiaKuala Lumpur 43000 Malaysia

Microelectronic power converters such as buck and boost converter are required to be tolerant to radiations including electron radiation. This paper examines electron radiation effects on the Ⅰ-Ⅴ characteristics of VDMOSFET and its corresponding effects in buck converter. Analysis of the electrical characteristics shows that after irradiation the threshold voltage and drain current for all VDMOSFETs degraded more than two orders of magnitude. The impact of this electrical degradation has been investigated in an application of typical buck converter circuit. The buck converter with n-channel switching transistor shows that after irradiation its output voltage increased with the drain current in the n-channel ZVN4424 A VDMOSFET, while the buck converter with p-channel switching transistor shows its output voltage decreased with the drain current in the p-channel ZVP4424 A VDMOSFET after irradiation.

关键词： VDMOSFET I–V characteristics Drain current Buck converter Electron radiation

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Influence of urban air pollution on the population in the Klang Valley,Malaysia:a spatial approach

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Ecological Processes 2022年第1期11卷 126-141页

作者： Siti Haslina Mohd Shafie Mastura Mahmud Suzani Mohamad nor Lita Fadilah Rameli Ramdzani Abdullah Ahmad Fariz Mohamed Centre for Research in Development Social and Environment(SEEDS)Faculty of Social Sciences and HumanitiesUniversiti Kebangsaan MalaysiaBangiSelangorMalaysia Department of Environment Faculty of Forestry and Envi-ronmentUniversiti Putra MalaysiaSerdangSelangorMalaysia Institute for Environment and Development(LESTARI) Universiti Kebangsaan MalaysiaBangiSelangorMalaysia.

Background:Urban air pollution resulting from economic growth as well as urbanization impacts the health of *** study aims to examine the spatial distribution of particulate matter(PM_(10))and the risk of exposure for the population in the Klang Valley,an urban conglomeration centred in Kuala Lumpur,***:The inverse distance weighted(IDW)interpolation technique in the ArcGIS platform was used to map the air quality from five air monitoring *** statistics of the Global Moran’s I Spatial Autocorrelation and Optimized Hot Spot Analysis were used to estimate the spatial clustering of PM_(10).The population-weighted exposure level(PWEL)technique was used to calculate the population density susceptible to PM_(10)and the AirQ+model was applied to estimate the proportion of the adult population at risk of chronic bronchitis due to long-term exposure to PM_(10)concentrations in the Klang ***:The highest annual mean PM_(10)concentrations at the Klang station ranged between 80 and 100μg/m^(3)from 2000 to 2009 and exceeded the New Malaysia Ambient Air Quality Standard(NMAAQS)and the World Health Organi-zation Air Quality Guidelines(WHOAQG)levels of 40 and 20μg/m^(3),*** Moran’s I results indicated that the statistically significant clusters of high PM_(10)in Klang present a health risk to the local *** PWEL results showed that levels of PM_(10)in Petaling Jaya exceeded the WHOAQG limits,potentially posing a health risk to the high-density *** AirQ+model found Klang to be a significantly high-risk area for chronic bronchitis among the adult population with 804,240 people(with a relative risk of 1.85)in ***:These high-risk values are due to rapid urbanization and high motor vehicle usage in the Klang Valley and therefore the impact of PM_(10)on the population needs to be *** situation should be taken seriously by the Department of Environment and Kuala Lumpur City Hall in addre

关键词： Population Urban air pollution Spatial distribution PM_(10) Adult chronic bronchitis risk

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Review:Botnet detection techniques: review, future trends, and issue

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Journal of Zhejiang University-Science C(Computers and Electronics) 2014年第11期15卷 943-983页

作者： Ahmad KARIM Rosli Bin SALLEH Muhammad SHIRAZ Syed Adeel Ali SHAH Irfan AWAN nor Badrul ANUAR Faculty of Computer Science and Information Technology University of Malaya Kuala Lumpur Malaysia Department of Computer Science University of Bradford Bradford BD7 1DP UK

In recent years, the Internet has enabled access to widespread remote services in the distributed computing environment; however, integrity of data transmission in the distributed computing platform is hindered by a number of security issues. For instance, the botnet phenomenon is a prominent threat to Internet security, including the threat of malicious codes. The botnet phenomenon supports a wide range of criminal activities, including distributed denial of service(DDoS) attacks, click fraud, phishing, malware distribution, spam emails, and building machines for illegitimate exchange of information/materials. Therefore, it is imperative to design and develop a robust mechanism for improving the botnet detection, analysis, and removal process. Currently, botnet detection techniques have been reviewed in different ways; however, such studies are limited in scope and lack discussions on the latest botnet detection techniques. This paper presents a comprehensive review of the latest state-of-the-art techniques for botnet detection and figures out the trends of previous and current research. It provides a thematic taxonomy for the classification of botnet detection techniques and highlights the implications and critical aspects by qualitatively analyzing such techniques. Related to our comprehensive review, we highlight future directions for improving the schemes that broadly span the entire botnet detection research field and identify the persistent and prominent research challenges that remain open.

关键词： Botnet detection Anomaly detection Network security Attack Defense Taxonomy

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Bacterial microbiome of Coptotermes curvignathus （Isoptera： Rhinotermitidae） reflects the coevolution of species and dietary pattern

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Insect Science 2014年第5期21卷 584-596页

作者： Jie Hung Patricia King nor Muhammad Mahadi Choon Fah Joseph Bong Kian Huat Ong Osman Hassan Faculty of Agriculture and Food Sciences Universiti Putra Malaysia Bintulu Sarawak Campus Sarawak Malaysia Genome Institute Jalan Bangi Lama 43000 Kajang Faculty of Science and Technology UniversiU Kebangsaan Malaysia 43600 UKM BangiSelangor Malaysia

Coptotermes curvignathus Holmgren is capable of feeding on living trees. This ability is attributed to their effective digestive system that is furnished by the termite＇s own cellulolytic enzymes and cooperative enzymes produced by their gut microbes. In this study, the identity of an array of diverse microbes residing in the gut of C. curvignathus was revealed by sequencing the near-full-length 16S rRNA genes. A total of 154 bacterial phylotypes were found. The Bacteroidetes was the most abundant phylum and accounted for about 65% of the gut microbial profile. This is followed by Firmicutes, Actinobacteria, Spirochetes, Proteobacteria, TM7, Deferribacteres, Planctomycetes, Ferrucomicrobia, and Termite Group 1. Based on the phylogenetic study, this symbiosis can be a result of long coevolution of gut enterotypes with the phylogenic distribution, strong selection pressure in the gut, and other speculative pressures that determine bacterial biome to follow. The phylogenetic distribution of cloned rRNA genes in the bacterial domain that was considerably different from other termite reflects the strong selection pressures in the gut where a proportional composition of gut microbiome of C. curvignathus has established. The selection pressures could be linked to the unique diet preference of C. curvignathus that profoundly feeds on living trees. The delicate gut microbiome composition may provide available nutrients to the host as well as potential protection against opportunistic pathogen.

关键词： Coptotermes curvignathus diet preference gut microbiome selection

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Development and characterization of food packaging bioplastic film from cocoa pod husk cellulose incorporated with sugarcane bagasse fibre

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Journal of Bioresources and Bioproducts 2020年第4期5卷 248-255页

作者： Siti Nuurul Hud Mohammad Azmin Najah Aliah binti Mohd Hayat Mohd Shukri Mat nor Faculty of Agro-Based Industry Universiti Malaysia Kelantan Jeli CampusLocked Bag 10017600 Jeli KelantanMalaysia Department of Research and Development Jeli Agricultural TechnologyPT7458 Kampung Gemang Baru17700 Ayer LanasJeli KelantanMalaysia

Agricultural wastes,including cocoa pod husk(waste from the chocolate industry)and sugarcane bagasse(waste from the sugar industry),are increasing day by *** development of food packaging biofilms from these two wastes could be beneficial to the environment and ***,this study was conducted to develop biodegradable plastic films by using cocoa pod husk and sugarcane *** and fibre were extracted from cocoa pod husk and sugar-cane bagasse,*** developed bioplastic films were divided into several concentration ratios of cellulose and fibre which are 100꞉0(100%cellulose),75꞉25(cellulose꞉fibre),50꞉50(cel-lulose꞉fibre),25꞉75(cellulose꞉fibre),and 0꞉100(100%fibre).The physicochemical properties for all bioplastic concentration ratios were determined in terms of sensory evaluation,drying time,moisture content,water absorption and water vapor *** the observation and anal-ysis of the physicochemical properties of bioplastic,we found that the most suitable bioplastic film for food packaging goes to the combination of 75%cellulose and 25%fibre bioplastic,as it demonstrated the lowest water absorption percentage and water vapor permeability.

关键词： Agricultural waste Cocoa pod husk Sugarcane bagasse Bioplastic film Water absorption Moisture content

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Tolosa-Hunt Syndrome with underlying latent tuberculosis:a diagnostic dilemma

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International Journal of Ophthalmology(English edition) 2021年第4期14卷 633-635页

作者： Abdullah Ashraj Rafique Ali Tajunisah Iqbal Justin Yeah nor Una Ramli University Malaya Eye Research Centre Department of OphthalmologyUniversity of MalayaKuala Lumpur 50603Malaysia Department of Ophthalmology Faculty of MedicineUniversity of MalayaKuala Lumpur 50603Malaysia Ophthalmology Department Faculty of MedicineUniversiti Teknologi MARASungai BulohSelangor 47000Malaysia

Dear Editor,I am *** Ashraf from Department of Ophthalmology,University of Malaya,Malaysia.I write to present a case of Tolosa-Hunt Syndrome(THS)with underlying latent tuberculosis which became an interesting diagnost... 详细信息

关键词： tuberculosis Tolosa latent

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Fabrication, characterization and response surface method optimization for quantum efficiency of fluorescent nitrogen-doped carbon dots obtained from carboxymethylcellulose of oil palms empty fruit bunch

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Chinese Journal of Chemical Engineering 2020年第2期28卷 584-592页

作者： Mohammed Abdullah Issa Zurina Zainal Abidin Shafreeza Sobri Suraya Abdul-Rashid Mohd Adzir Mahdi nor Azowa Ibrahim Musa Y.Pudza Department of Chemical and Environmental Engineering Faculty of EngineeringUniversiti Putra Malaysia43400 UPM SerdangSelangorMalaysia Department of Computer&Communications Systems Engineering Faculty of EngineeringUniversiti Putra Malaysia43400 UPM SerdangSelangorMalaysia Department of Chemistry Faculty of ScienceUniversiti Putra Malaysia43400 SerdangSelangorMalaysia

Bio based nitrogen doped carbon dots(N-CDs)were obtained from empty fruit bunch carboxymethylcellulose and ethylenediamine(EDA)through one-pot hydrothermal carbonization *** optimum as-formed NCDs were thoroughly characterized via Transmission electron microscopy(TEM),high-resolution TEM(HRTEM),Fourier transform infrared(FTIR),X-ray photoelectron spectra(XPS),UV–vis spectra(UV–Vis)and Fluorescence spectra(PL).Response surface methodology was statistically used to assess three independent variables that have major influence on the fluorescence quantum yield(QY),including temperature(230–270℃),time(2–6 h)and EDA mass(10%–23.3%).Based on analysis of variance(ANOVA)results,synthesis temperature was found to be the most influential factor on the QY,followed by time and EDA *** temperature,long synthesis time and high amount of EDA were satisfactorily enough for efficient carbonization conversion rate and obtaining highest QY of *** obtained quadratic model(R^2=0.9991)shows a good correlation between the experimental data and predicted *** optimum synthetic parameters are of 270℃temperature,6 h reaction time and 23.3%of EDA *** optimized as-made N-CDs exhibited blue photoluminescence with both excitation dependent/independent phenomena and high nitrogen *** maximum emission intensity was 426 nm at a maximum excitation wavelength of 320 nm,with a QY of up to 22.9%.XPS and FTIR data confirmed the existence of polar containing groups,such as carbonyl,carboxyl,hydroxyl and amino groups over the surface of N-CDs whereas nitrogen species in the form of(pyridinic and graphitic-N)were introduced in the aromatic carbon domains,which imparts the hydrophilic and photostability of *** into account the low-cost and sustainable production of N-CDs,this method considered a feasible route for converting low quality waste into value-added nanomaterials and utilizing for different functionalization processes and analytical applications.

关键词： Carbon dots Fluorescence Response surface methodology Optimization Nitrogen doped

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Zinc and Copper Concentrations in Two Species of Intertidal Crabs from the Middle of the West Coast of Peninsular Malaysia

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湿地科学 2009年第3期7卷 218-229页

作者： Mohammad Mohd Ikram Ahmad Ismail Chee Kong Yap nor Azwady Abd Aziz Department of Basic Science and Engineering Faculty of Agriculture and Food Sciences Universiti Putra Malaysia Bintulu Sarawak 97008 Malaysia Department of Biology Faculty of ScienceUniversiti Putra Malaysia UPM 43400 Serdang Selangor Malaysia

A study on Zn and Cu concentrations in 2 species of intertidal crabs,namely Uca annulipes and Dotilla myctiroides collected from the intertidal coastal area of Selangor(5 sites) and Negeri Sembilan(3 sites),west coast of Peninsular Malaysia,was carried *** various localized sources of Zn and Cu discharges towards both the crab species were mentioned.A comparative study between the 2 crab species also revealed that the concentrations of Zn and Cu were significantly(P<0.05) higher in *** when compared to *** difference was related to the organic matter percentage in the crabs' microhabitat sediments since metals can be associated with the organic matter of sediments in which they might ***(P<0.05) higher organic matter content was shown in *** sediments when compared to *** sediments for all *** metal and size relationship in the crabs was also *** relationships between Zn and Cu concentrations with body weight and carapace width of *** and *** were significantly(P<0.01 and P<0.05) correlated although the pair wise was weak.

关键词：沉积物马来西亚半岛有机物质螃蟹

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Call me American

Call me American

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作者： Abdi nor Iftin with Max Alexander.

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