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Open Journal of Physical Chemistry 2021年第3期11卷 129-143页

作者： Muhammad Hidhir Khawory mohd Ferdaues mohd Subki mohd anuar shahudin Nurul Hidayatul Afifah Saufi Sofian Nur Hidayah Latif Nurul Hanim Salin Siti Zuraidah Mohamad Zobir Mohamed Ibrahim Noordin Malaysian Institute of Pharmaceutical and Nutraceutical (IPharm) Pulau Pinang Malaysia National Institutes of Biotechnology Malaysia (NIBM) Selangor Malaysia PICOMS International University College Kuala Lumpur Malaysia

Carica papaya leaf extracts from four different extraction methods (cold-water, hot-water, sonication and supercritical fluid), were characterized using physico-chemical analysis. Sonication extraction showed the highest percentage yield of crude extracts (6.76%) and the lowest from the supercritical fluid extraction (1.83%). The Infrared (IR) spectrum of cold-water extract demonstrated the most similarity of functional group to quercetin. Likewise, the thermal analysis indicated that cold-water extract gave a quite similar Endothermic peak to quercetin with the obtained value which was 137°C and onset value which was 118°C. The liquid chromatography (LC) profile indicated that only the cold-water extract exhibited 0.203 ppm of quercetin.

关键词： Carica papaya Extraction Infrared Liquid Chromatography Thermal Analysis

Occurrence of K1 and K2 serotypes and genotypic characteristics of extended spectrumβ-lactamases-producing Klebsiella pneumoniae isolated from selected hospitals in Malaysia

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Asian Pacific Journal of Tropical Medicine 2024年第1期17卷 30-38页

作者： Nurul Syazrah anuar Hazmin Hazman Sharven Raj Jeyakumar mohd Nasir mohd Desa Hasni Idayu Saidi Siti Norbaya Masri Nur Afiza Aziz Nurshahira Sulaiman Department of Biomedical Science Faculty of Medicine and Health SciencesUniversiti Putra Malaysia43400UPM SerdangSelangorMalaysia Department of Medical Microbiology Faculty of Medicine and Health SciencesUniversiti Putra Malaysia43400UPM SerdangSelangorMalaysia Microbiology Unit Department of PathologyHospital Sultanah AminahJalan Persiaran Sultan Abu Bakar80100 Johor BahruJohorMalaysia

Objective:To determine the distribution,phenotypic and genetic background of extended spectrumβ-lactamases(ESBL)-producing Klebsiella(K.)pneumoniae clinical isolates associated with K1 and K2 serotypes in two selected hospitals in ***:A total of 192 *** isolates were collected and subjected to antibiotic susceptibility,hypermucoviscosity test and multiplex PCR to detect the presence of K1-and K2-serotype associated *** sequence typing(MLST)was performed on ESBL-producing *** isolates presented with K1 and K2 serotypes,followed by phylogenetic ***:A total of 87 out of 192(45.3%)of the *** isolates collected were ESBL ***,only 8.3%(16/192)and 10.9%(21/192)of the total isolates were detected to carry K1-and K2-serotype associated genes,*** analysis showed that K1 and K2 capsular serotypes were not significantly associated with ESBL phenotype(P=0.196).However,they were significantly associated with hypervirulent,as demonstrated by the positive string test(P<0.001).MLST analysis revealed that ST23 as the predominant sequence type(ST)in the K1 serotype,while the ST in the K2 serotype is more ***:Although the occurrence of ESBL-producing isolates among the hypervirulent strains was low,their coexistence warrants the need for continuous *** showed that these isolates were genetically heterogeneous.

关键词： Extended spectrumβ-lactamases Klebsiella pneumoniae Capsular serotypes Genotypic

多盘连续可变工作间隙磁流变制动器仿真与验证

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重庆大学学报 2024年第8期47卷 26-38页

作者：李东恒王娜 Saiful anuar Abu Bakar 宋万里马来西亚理工大学汽车发展中心马来西亚新山81310 马来西亚理工大学机械工程学院马来西亚新山81310 柳州职业技术大学机电工程学院广西柳州545006 东北大学机械工程与自动化学院沈阳110819

为提高磁流变制动器制动能效,提出一种多盘连续可变磁流变液工作间隙结构的磁流变制动器。在ANSYS workbench环境下完成不同电流、间隙状态下的三维静态磁场仿真,对磁场沿工作间隙分布状况进行分析,通过试验台架对制动器性能进行测试。... 详细信息

为提高磁流变制动器制动能效,提出一种多盘连续可变磁流变液工作间隙结构的磁流变制动器。在ANSYS workbench环境下完成不同电流、间隙状态下的三维静态磁场仿真,对磁场沿工作间隙分布状况进行分析,通过试验台架对制动器性能进行测试。结果表明,磁流变液工作区域磁矢量分布相对均匀,无明显积聚现象,磁路设计合理。理论与实验结果变化趋势基本吻合,但在电流较大时,两者之间误差呈逐渐增大趋势。制动力矩在0~2.5 A电流变化区间增速较快,而在2.5~4.0 A区间明显放缓,最大力矩达到146.4 N·m,较间隙未改变状态增加25.80%。设计的制动器TVR值达到48.81 kN·m/m^(3),较传统磁流变制动器结构更紧凑,力矩调节范围更广,设计思路及实验结论对磁流变制动器结构的进一步研究具有借鉴意义。

关键词：磁流变液楔形工作间隙连续可变制动性能

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Discovering optimal features using static analysis and a genetic search based method for Android malware detection

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Frontiers of Information Technology & Electronic Engineering 2018年第6期19卷 712-736页

作者： Ahmad FIRDAUS Nor Badrul anuar Ahmad KARIM mohd Faizal Ab RAZAK Department of Computer System and Technology University of Malaya Faculty of Computer System & Software Engineering University Malaysia Pahang Department of Information Technology Bahauddin Zakariya University

Mobile device manufacturers are rapidly producing miscellaneous Android versions worldwide. Simultaneously, cyber criminals are executing malicious actions, such as tracking user activities, stealing personal data, and committing bank fraud. These criminals gain numerous benefits as too many people use Android for their daily routines, including important communications. With this in mind, security practitioners have conducted static and dynamic analyses to identify malware. This study used static analysis because of its overall code coverage, low resource consumption, and rapid processing. However, static analysis requires a minimum number of features to efficiently classify malware. Therefore, we used genetic search（GS）, which is a search based on a genetic algorithm（GA）, to select the features among 106 strings. To evaluate the best features determined by GS, we used five machine learning classifiers, namely, Na？ve Bayes（NB）, functional trees（FT）, J48, random forest（RF）, and multilayer perceptron（MLP）. Among these classifiers, FT gave the highest accuracy（95%） and true positive rate（TPR）（96.7%） with the use of only six features.

关键词： Genetic algorithm Static analysis Android Malware Machine learning

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Dynamics of 7Li breakup and its influence on elastic scattering: a study of 7Li + 144Sm system

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Chinese Physics C 2024年第2期48卷 124-134页

作者： A.Morzabayev N.Amangeldi Awad A.Ibraheem D.Soldatkhan G.Yergaliuly B.Mauyey anuar.A.Orazalievna Sh.Hamada L.N.Gumilyov eurasian national university astanakazakhstan Institute of nuclear physics almatykazakhstan Physics department king khalid universityabhasaudi arabia Faculty of science tanta universitytantaegypt

The angular distributions of 7Li+144Sm elastic scattering over the energy range of 21.6–52 MeV are reanalyzed utilizing various interaction *** analysis aims to study the consistency of the implemented potentials in representing the considered data and investigate the cluster nature of the weakly bound 7Li *** will aid in the better understanding the impacts of 7Li breakup on the elastic scattering *** coupling to the breakup channel has a substantial impact on the elastic data and reproduces a repulsive dynamical polarization potential,which drastically diminishes the real potential *** reported impact was simulated by introducing a semi-microscopic repulsive DPP and by implementing the method of continuum discretized coupled *** analysis was also extended to understand the impact of triton transfer on the elastic scattering data.

关键词： phenomenological and semi-microscopic potentials cluster folding dynamic polarization

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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

Influence of rotational speed on mechanical properties of friction stir lap welded 6061-T6 Al alloy

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Transactions of Nonferrous Metals Society of China 2014年第4期24卷 1004-1011页

作者： Firouz FADAEIFARD Khamirul Amin MATORI Meysam TOOZANDEHJANI Abdul Razak DAUD mohd Khairol anuar mohd ARIFFIN Norinsan Kamil OTHMAN Farhad GHARAVI Abdul Hadi RAMZANI Farhad OSTOVAN Materials Synthesis and Characterization Laboratory Institute of Advanced TechnologyUniversiti Putra Malaysia Department of Physics Faculty of Science Universiti Putra Malaysia Department of Mechanical and Manufacturing Faculty of Engineering Universiti Putra Malaysia School of Applied Physics Faculty of Science and Technology Universiti Kebangsaan Malaysia

The effect of rotational speed on macro and microstructures, hardness, lap shear performance and failure mode of friction stir lap welding on AA6061-T6 Al alloy with 5 mm in thickness was studied by field-emission scanning electron microscopy （FE-SEM）. The results represent much closer hardness distribution in the upper and lower plates at the lowest rotational speed. It indicates the Fe-compounds in the fracture surface of the nugget zone by EDX.

关键词： aluminum alloy friction stir lap welding mechanical properties

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Heat and mass transfer analysis on flow of Williamson nanofluid with thermal and velocity slips:Buongiorno model

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Propulsion and Power Research 2019年第3期8卷 243-252页

作者： Yap Bing Kho Abid Hussanan Muhammad Khairul anuar Mohamed mohd Zuki Salleh Applied&Industrial Mathematics Research Group Faculty of Industrial Sciences&TechnologyUniversiti Malaysia PahangMalaysia Division of Computational Mathematics and Engineering Institute for Computational ScienceTon Duc Thang UniversityHo Chi Minh CityVietnam Faculty of Mathematics and Statistics Ton Duc Thang UniversityHo Chi Minh CityVietnam

The thermal and velocity slips of boundary layer of Williamson nanofluid over a stretching sheet are studied *** model is used to explore the heat transfer phenomena caused by Brownian motion and *** similarity transformations,the governing equations are reduced to a set of nonlinear ordinary differential equations(ODEs).These equations are solved numerically by using Shooting *** effects of non-Newtonian Williamson parameter,velocity and thermal slip parameters,Prandtl number,Brownian parameter,Schmidt number,Lewis number,Brownian motion parameter,thermophoresis parameter on velocity,temperature and concentration fields are shown graphically and *** results found that the thickness of boundary layer decreases as the slip and thermal factor parameter ***,present results indicate that the nanofluid temperature and concentration are enhanced with a rise of Williamson *** Nusselt number is reduced with an increase of the Lewis and Prandtl numbers.

关键词： Williamson nanofluid Slip conditions Heat transfer Stretching sheet

Hyperuricemia Prediction Using Photoplethysmogram and Arteriograph

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Computers, Materials & Continua 2022年第4期71卷 287-304页

作者： Hafifah Ab Hamid Nazrul anuar Nayan mohd Zubir Suboh Nurin Izzati Mohamad Azizul Mohamad Nazhan mohd Nizar Amilia Aminuddin mohd Shahrir Mohamed Said Saharuddin Ahmad Department of Electrical Electronic and SystemsFaculty of Engineering and Built EnvironmentUniversiti Kebangsaan MalaysiaBangi43600Malaysia Department of Physiology Faculty of MedicineUniversiti Kebangsaan MalaysiaCheras56000Malaysia Department of Medicine Faculty of MedicineUniversiti Kebangsaan MalaysiaCheras56000Malaysia Family Medicine Department Faculty of MedicineUniversiti Kebangsaan MalaysiaCheras56000Malaysia

Hyperuricemia is an alarming issue that contributes to cardiovascular *** acid(UA)level was proven to be related to pulse wave velocity,a marker of arterial stiffness.A hyperuricemia prediction method utilizing photoplethysmogram(PPG)and arteriograph by using machine learning(ML)is *** the literature search,there is no available papers found that relates PPG with UA level even though PPG is highly associated with vessel *** five phases in this research are data collection,signal preprocessing including denoising and signal quality indexes,features extraction for PPG and SDPPG waveform,statistical analysis for feature selection and classification of UA levels using *** PPG to the current arteriograph able to reduce cost and increase the prediction *** and arteriograph data were measured from 113 subjects,and 226 sets of data were collected from the left and right hands of the *** performance of four types of ML,namely,artificial neural network(ANN),linear discriminant analysis(LDA),k-nearest neighbor(kNN),and support vector machine(SVM)in predicting hyperuricemia was *** the total of 98 features extracted,16 features of which showed statistical significance for hyper and *** gives the best performance compared to the other three ML techniques with 91.67%,95.45%,and 94.12%for sensitivity,specificity,and accuracy,*** from PPG and arteriograph able to be used to predict hyperuricemia accurately and *** study is the first to find the relationship of PPG with *** shows a significant relation between PPG signals and arteriograph data toward the UA *** proposed method of UA prediction shows its potential for noninvasive preliminary assessment.

关键词： PPG arteriograph second derivative of PPG hyperuricemia ML

Strength Performance and Microstructure Characteristic of Naturally-Bonded Fiberboard Composite from Malaysian Bamboo(Bambusa vulgaris)

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Journal of Renewable Materials 2022年第10期10卷 2581-2591页

作者： Shahril anuar Bahari mohd Nazarudin Zakaria Syaiful Osman Falah Abu Mohamad Jani Saad Reza Hosseinpourpia Eco-Technology Program Faculty of Applied SciencesUniversiti Teknologi MARA(UiTM)Shah Alam40450Malaysia Engineering Research Centre Malaysian Agricultural Research and Development Institute(MARDI)Serdang43400Malaysia Department of Forestry and Wood Technology Linnaeus UniversityVäxjö35195Sweden

This study investigated the mechanical properties and microstructural characteristics of fiberboard composite produced by naturally-bonded Malaysian bamboo fiber(Bambusa vulgaris).The components that obtained through soda pulping of bamboo culms such as fiber and black liquor,were used for the preparation of high-density fibreboard composite at two target densities of 850 and 950 kg/m^(3).The bamboo fiberboard composite(BFC)were then produced at 200°C and two pressing parameters of 125 and 175 s/*** mechanical properties,e.g.,flexural strength and internal bonding(IB)of BFC samples were evaluated according to BS EN 310:1993 and BS EN 319:1993,*** was found that the mechanical performance of the composite with 850 kg/m^(3)density was significantly higher than 950 kg/m^(3)ones,especially for the samples with 125 s/mm pressing *** characteristic of the BFC samples illustrated that the fiber linkages were cracked in the composites with higher density,e.g.,the composite with the density of 950 kg/m^(3)and also black liquor were slightly degraded at longer pressing time,which led to the reduction in mechanical properties,especially in IB strength.

关键词： Bamboo fiber naturally-bonded black liquor mechanical properties SEM composite