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Asian Pacific Journal of Tropical Biomedicine 2017年第1期7卷 27-31页

作者： Suzanah Abdul Rahman nur amalina ahmad Nadia Hanis Abdul Samat Syazana Zahri Afif Raihan Abdullah Kit-Lam Chan Department of Biomedical Science Kulliyyah of Allied Health SciencesInternational Islamic University Malaysia School of Pharmaceutical Sciences Universiti Sains Malaysia

Objective: To evaluate the effects of Eurycoma longifolia(E. longifolia) standardized extract on the oestrous cycle, levels of reproductive hormones and histology of the ovaries of Sprague-Dawley ***: Female rats were orally treated with E. longifolia standardized extract at the dose levels of 2.5, 5.0, 10.0, 25.0, 50.0 and 100.0 mg/kg of body weight over 5 *** smears were monitored daily within the duration and after withdrawal of the treatment before being sacrificed. The body weights of the females were recorded before and after the 5 days treatment. At the end of the experiments, blood samples were collected for determination of testosterone, oestradiol and progesterone levels. Ovaries were removed, weighed and examined for histomorphological ***: The administration of E. longifolia standardized extract did not significantly alter the oestrous cycle of the rats during the 5 days treatment and after withdrawal of the treatments. This was supported by normal testosterone, oestradiol and progesterone levels as well as normal morphology of the ***: The data obtained showed that E. longifolia standardized extract did not exhibit any toxic effect on reproductive activities of female rats suggesting potential use in the management of infertility.

关键词： Eurycoma longifolia Oestrous cycle Testosterone Oestradiol Progesterone Ovaries

Microwave-assisted solvent extraction of castor oil from castor seeds

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Chinese Journal of Chemical Engineering 2018年第12期26卷 2516-2522页

作者： nur Atirah Ibrahim Muhammad Abbas ahmad Zaini Centre of Lipids Engineering & Applied Research (CLEAR) Ibnu-Sina Institute for Scientific & Industrial Research Universiti Teknologi Malaysia 81310 UTM Johor Bahru Johor Malaysia School of Chemical & Energy Engineering Faculty of Engineering Universiti Teknologi Malaysia

This study was aimed at evaluating the physicochemical properties and oxidation stability of castor oil using microwave-assisted solvent extraction(MAE). MAE was performed using 5% ethanol in hexane as solvent at different extraction times, power intensities and solvent-to-feed(S/F, ml of solvent to gram of feed) *** process parameters were optimized by statistical approach using historical data design of response surface method(RSM). The oils were characterized for yield, physicochemical properties, dielectric properties and oxidation stability, and comparison was also made with oil extracted using Soxhlet method. Results show that the maximum oil yield of 37% was obtained at 20 min with microwave power intensity of 330 W and S/F ratio of 20. The main fatty acid composition of castor oil is ricinoleic acid. The density, refractive index, dielectric properties and oxidation stability of oils are not affected by the extraction methods and extraction parameters of MAE. However, the MAE-extracted oil is more viscous compared to that by Soxhlet method. With extra caution on oil oxidation, MAE could be a promising solvent extraction method with an 86% less in processing time and a higher yield.

关键词： Castor seed Castor oil Dielectric properties Microwave-assisted solvent extraction Oxidation stability

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Analysis of Convective Transport of Temperature-Dependent Viscosity forNon-Newtonian Erying Powell Fluid: A Numerical Approach

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Computers, Materials & Continua 2021年第1期66卷 675-689页

作者： Ahlam Aljabali Abdul Rahman Mohd Kasim nur Syamilah Arifin Sharena Mohamad Isa Noor amalina Nisa Ariffin Centre for Mathematical Sciences UMPGambang26300Malaysia Faculty of Computer and Math Sciences UiTM JohorPasir Gudang CampusMasai81750Malaysia Manufacturing Engineering Technology Section UniKLItaly Design InstituteKuala Lumpur56100Malaysia

Non-Newtonian is a type of fluid that does not comply with the viscosity under the Law of Newton and is being widely used in industrial *** include those related to chemical industries,cosmetics manufacturing,pharmaceutical field,food processing,as well as oil and gas *** inability of the conventional equations of Navier–Stokes to accurately depict rheological behavior for certain fluids led to an emergence study for non-Newtonian fluids’*** line with this,a mathematical model of forced convective flow on non-Newtonian Eyring Powell fluid under temperature-dependent viscosity(TDV)circumstance is *** fluid model is embedded with the Newtonian heating(NH)boundary condition as a heating circumstance and is assumed to move over a stretching sheet acting *** appropriate similarity variables,the respective model was converted into ordinary differential equations(ODE),which was later solved utilizing the Keller box *** present model is validated by comparing the existing output in literature at certain special limiting cases,where the validation results display a firm *** current outputs for the proposed model are shown in tabular and graphical form for variation of skin friction plus Nusselt number,velocity and temperature distribution,respectively.

关键词： Temperature-dependent viscosity erying powell fluid vertical stretching sheet numerical solution boundary layer

Gaussian Process for a Single-channel EEG Decoder with Inconspicuous Stimuli and Eyeblinks

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Computers, Materials & Continua 2022年第10期73卷 611-628页

作者： nur Syazreen ahmad Jia Hui Teo Patrick Goh School of Electrical&Electronic Engineering Universiti Sains MalaysiaNibong TebalPenang14300Malaysia

A single-channel electroencephalography(EEG)device,despite being widely accepted due to convenience,ease of deployment and suitability for use in complex environments,typically poses a great challenge for reactive brain-computer interface(BCI)applications particularly when a continuous command from users is desired to run a motorized actuator with different speed *** this study,a combination of an inconspicuous visual stimulus and voluntary eyeblinks along with a machine learning-based decoder is considered as a new reactive BCI paradigm to increase the degree of freedom and minimize mismatches between the intended dynamic command and transmitted control *** proposed decoder is constructed based on Gaussian Process model(GPM)which is a nonparametric Bayesian approach that has the advantages of being able to operate on small datasets and providing measurements of uncertainty on *** evaluate the effectiveness of the proposed method,the GPM is compared against other competitive techniques which include k-Nearest Neighbors,linear discriminant analysis,support vector machine,ensemble learning and neural *** demonstrate that a significant improvement can be achieved via the GPM approach with average accuracy reaching over 96%and mean absolute error of no greater than 0.8 cm/*** addition,the analysis reveals that while the performances of other existing methods deteriorate with a certain type of stimulus due to signal drifts resulting from the voluntary eyeblinks,the proposed GPM exhibits consistent performance across all stimuli considered,thereby manifesting its generalization capability and making it a more suitable option for dynamic commands with a single-channel EEG-controlled actuator.

关键词： Brain-computer interface dynamic command electroence phalography gaussian process model visual stimulus voluntary eyeblinks

Geoaccumulation and distribution of heavy metals in the urban river sediment

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International Journal of Sediment Research 2014年第3期29卷 368-377页

作者： nur Aliaa SHAFIE ahmad Zaharin ARIS Hazzeman HARIS Environmental Forensics Research Centre Faculty of Environmental StudiesUniversiti Putra Malaysia43400 UPM SerdangSelangorMalaysia

Current study presents the application of chemometric techniques to comprehend the interrelations among sediment variables whilst identifying the possible pollution source at Langat River,*** sediment samples（0-10 cm）were collected at 22 sampling stations and analyzed for total metals(48Cd,29Cu,30Zn,82Pb),pH,redox potential（Eh）,salinity,electrical conductivity（EC）,loss on ignition（LOI）and cation exchange capacity（CEC）.The principal component analysis（PCA）scrutinized the origin of environmental pollution by various anthropogenic and natural activities:four principal components were obtained with 86.34%（5 cm）and88.34%（10 cm）.Standard,forward and backward stepwise discriminant analysis effectively discriminate 2variables（84.06%）indicating high variation of heavy metals accumulation at both *** cluster analysis accounted for high input of Zn and Pb at LA8,LA 10,LA 11 and LA 12 that mergers three（5 cm）and four（10cm）into *** is consistent with the contamination factor（C1）that shows high Cd（LA 1）and Pb（LA 7,LA 8,LA 10,LA 11 and LA 12）contaminations at *** indicate that Pb and Zn are the most bioavailable metals in the sediment with significant positive linear relationship at both sediment ***,this approach is a good indication of environmental pollution status that transfers new findings on the assessment of heavy metals by interpreting large complex datasets and predicting the fate of heavy metals in the sediment.

关键词： Heavy metals Principal Component Analysis Cluster Analysis River Sediment

Modeling and Simulation for Transient Thermal Analyses Using a Voltage-in-Current Latency Insertion Method

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Journal of Electronic Science and Technology 2022年第4期20卷 383-395页

作者： Wei Chun Chin Boon Chun New nur Syazreen ahmad Patrick Goh School of Electrical and Electronic Engineering Universiti Sains MalaysiaPenang 14300

This article presents a modeling and simulation method for transient thermal analyses of integrated circuits(ICs)using the original and voltage-in-current(VinC)latency insertion method(LIM).LIM-based algorithms are a set of fast transient simulation methods that solve electrical circuits in a leapfrog updating manner without relying on large matrix operations used in conventional Simulation Program with Integrated Circuit Emphasis(SPICE)-based methods which can significantly slow down the solution *** conversion from the thermal to electrical model is performed first by using the analogy between heat and electrical *** electrical inductance has no thermal equivalence,a modified VinC LIM formulation is presented which removes the requirement of the insertion of fictitious *** examples are presented,which show that the modified VinC LIM formulation outperforms the basic LIM formulation,in terms of both stability and accuracy in the transient thermal simulation of ICs.

关键词： Latency insertion method(LIM) numerical simulation thermal analysis transient simulation

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Inventory and sales decisions in a vendor–buyer system with imperfect items and learning in inspection

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Journal of Control and Decision 2021年第4期8卷 453-463页

作者： Wakhid ahmad Jauhari Diah Ayu Purnasari Cucuk nur Rosyidi Department of Industrial Engineering Universitas Sebelas MaretSurakartaIndonesia

In this study,we propose a joint economic lot-sizing model to include learning process along with errors in inspection and full backordering *** aim to study pricing and inventory decisions in a two-level supply chain involving a single vendor and a single buyer in which the demand is sensitive to price and company’s advertisement *** mathematical inventory model is developed analytically and solved using a proposed *** objective of the model is to maximise joint total profit by simultaneously determining optimal shipment size,number of deliveries,backorder quantity and product selling price.A numerical example is provided to show the application of the model and to investigate the impact of key parameter’s changes on model *** comparing the integrated/centralised model to the independent/decentralised model,we note that the integrated/centralised model provides better profit to the system,along with lower selling price and smaller amount of backorder.

关键词： Lot sizing inventory model supply chain learning inspection error sensitive demand full backorder

Potential use of nanofiltration like-forward osmosis membranes for copper ion removal

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Chinese Journal of Chemical Engineering 2020年第2期28卷 420-428页

作者： Wan nur Ain Shuhada Abdullah Sirinan Tiandee Woeijye Lau Farhana Aziz ahmad Fauzi Ismail Advanced Membrane Technology Research Centre(AMTEC) Universiti Teknologi Malaysia81310 SkudaiJohorMalaysia School of Chemical and Energy Engineering Universiti Teknologi Malaysia81310 SkudaiJohorMalaysia Faculty of Science and Industrial Technology Prince of Songkla UniversitySurat Thani Campus84000 Surat ThaniThailand

The discharge of industrial effluent containing heavy metal ions would cause water pollution if such effluent is not properly *** this work,the performance of emerging nanofiltration(NF)like-forward osmosis(FO)membrane was evaluated for its efficiency to remove copper ion from ***,copper ion is removed from aqueous solution via adsorption and/or ion-exchange *** engineered osmosis method as proposed in this work considered four commercial NF membranes(i.e.,NF90,DK,NDX and PFO)where their separation performances were accessed using synthetic water sample containing 100 mg·L-1 copper ion under FO and pressure retarded osmosis(PRO)*** findings indicated that all membranes could achieve almost complete removal of copper regardless of membrane orientation without applying external driving *** high removal rates were in good agreement with the outcomes of the membranes tested under pressuredriven mode at 1 *** use of appropriate salts as draw solutes enabled the NF membranes to be employed in engineered osmosis process,achieving a relatively low reverse solute *** findings showed that the best performing membrane is PFO membrane in which it achieved N 99.4%copper rejection with very minimum reverse solute flux of<1 g·m-2·h-1.

关键词： Nanofiltration Forward osmosis Copper Divalent salt Water flux

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Anthropogenic disturbance of aquatic biodiversity and water quality of an urban river in Penang, Malaysia

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Water Science and Engineering 2023年第3期16卷 234-242页

作者： nur Azalina Suzianti Feisal Noor Haziqah Kamaludin Muhammad Firdaus Abdullah Sani Dayang Khairulnisa Awang ahmad Mohd Azwan ahmad nur Faiza Abdul Razak Tengku Nilam Baizura Tengku Ibrahim Department of Environmental Health Faculty of Health SciencesMAHSA UniversityBandar Saujana Putra42610 JenjaromMalaysia Center of Environmental Health&Safety Faculty of Health SciencesUniversiti Teknologi MARA42300 Puncak AlamMalaysia NaturePRO Services Port Dickson71000 Negeri SembilanMalaysia Department of Environmental Health Faculty of Health SciencesUniversiti Teknologi MARACawangan Pulau PinangKampus Bertam13200 Pulau PinangMalaysia

Malaysia's rapid economic and demographic development have placed negative pressure on its water supplies and the quality of the Juru River, which is close to the nation's capital and its major source of water. Healthy aquatic ecosystems are supported by physicochemical properties and biological diversity. This study evaluated the anthropogenic impacts on aquatic biodiversity, especially plankton, fish, and macrobenthos, as well as the water quality of the Juru River in the Penang area. Aquatic biodiversity and river water parameters were collected from ten sampling stations along the Juru River. Seven variables were used to assess the physicochemical environment: pH, temperature, total suspended solids (TSS), salinity, dissolved oxygen (DO), biochemical oxygen demand (BOD), and chemical oxygen demand. At each sampling station, the total number of plankton, fish, and macrobenthic taxa were counted and analyzed. The relationships between the physicochemical parameters and aquatic biodiversity were investigated with biotypological analysis, principal component analysis, hierarchical cluster analysis, and linear regression analysis. These analyses showed that the richness and diversity indices were generally influenced by salinity, temperature, TSS, BOD, and pH. The data obtained in this study supported the bioindicator concept. The findings, as they related to scientifically informed conservation, could serve as a model for Juru River management, as well as for river management throughout Malaysia and other tropical Asian countries.

关键词： Anthropogenic disturbance Aquatic biodiversity River water quality Urban river Hierarchical cluster analysis

A systematic review of soil erosion control practices on the agricultural land in Asia

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International Soil and Water Conservation Research 2020年第2期8卷 103-115页

作者： nur Syabeera Begum Nasir ahmad Firuza Begham Mustafa Safiah@Yusmah Muhammad Yusoff Gideon Didams Department of Geography Faculty of Arts and Social Sciences University of Malaya Kuala Lumpur Malaysia

Soil is the basis of production in agriculture activities. The combination of intensive farming activities, improper farming practices, rainfall regimes, and topography conditions that taken place in agricultural land lead to the soil erosion problem. Soil erosion is the major constraint to agriculture that affects the yield production and degraded environmental sustainability. Furthermore, soil erosion that occurs in the agricultural area has jeopardized the sustainability of agriculture activities. Asia is one of the major agricultural producers in the world. It is essential to know how to mitigate soil erosion in Asian agri-cultural land. This systematic review aims to analyze the existing literature on research that has been done on control practices that had been taken in Asia agricultural land towards soil erosion. This article is guided by the PRISMA Statement (Preferred Reporting Items for Systematic reviews and Meta-Analysis) review method. The authors systematically reviewed the literature to study the control practices that been taken and tested to control soil erosion on the agricultural land in Asia. Accordingly, this systematic review identified 39 related studies about the topic based on the Web of Science and Scopus databases. This article divided the control practices into three main themes, which are agronomic practices, agro-stological practices, and mechanical practices. The three main themes then produced a total of 11 sub-themes. Further specific and sustained research is needed to tackle this severe environmental problem through a better method, such as this systematic review method. The systematic review helps farmers and policymakers to implement the most practical approach to control and reduce soil erosion.

关键词： Systematic literature review Soil erosion Control practices Agricultural land Asia