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Faecal sterols as sewage markers in the Langat River,Malaysia:Integration of biomarker and multivariate statistical approaches

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Journal of Environmental Sciences 2012年第9期24卷 1600-1608页

作者： nur Hazirah Adnan mohamad Pauzi Zakaria Hafizan Juahir Masni Mohd Ali Centre of Excellence for Environmental Forensics Faculty of Environmental StudiesUniversiti Putra Malaysia 43400 SerdangSelangorMalaysia Department of Environmental Sciences Faculty of Environmental StudiesUniversiti Putra Malaysia43400 SerdangSelangorMalaysia School of Environmental and Natural Resource Sciences Faculty of Science and TechnologyUniversiti Kebangsaan Malaysia43600 BangiSelangorMalaysia

The Langat River in Malaysia has been experiencing anthropogenic input from urban, rural and industrial activities for many years. Sewage contamination, possibly originating from the greater than three million inhabitants of the Langat River Basin, were examined. Sediment samples from 22 stations （SL01-SL22） along the Langat River were collected, extracted and analysed by GC-MS. Six different sterols were identified and quantified. The highest sterol concentration was found at station SL02 （618.29 ng/g dry weight）, which situated in the Balak River whereas the other sediment samples ranged between 11.60 and 446.52 ng/g dry weight. Sterol ratios were used to identify sources, occurrence and partitioning of faecal matter in sediments and majority of the ratios clearly demonstrated that sewage contamination was occurring at most stations in the Langat River. A multivariate statistical analysis was used in conjunction with a combination of biomarkers to better understand the data that clearly separated the compounds. Most sediments of the Langat River were found to contain low to mid-range sewage contamination with some containing ＇significant＇ levels of contamination. This is the first report on sewage pollution in the Langat River based on a combination of biomarker and multivariate statistical approaches that will establish a new standard for sewage detection using faecal sterols.

关键词： sterols biomarkers surface sediments sewage pollution Langat River principal component analysis

Mechanical and degradation behaviour of biodegradable magnesium-zinc/hydroxyapatite composite with different powder mixing

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Journal of Magnesium and Alloys 2019年第4期7卷 566-576页

作者： Siti nur Hazwani mohamad Rodzi Hussain Zuhailawati B.K.Dhindaw Biomaterials Niche Area Group School of Materials and Mineral Resources EngineeringUniversiti Sains MalaysiaEngineering Campus14300 Nibong TebalPenangMalaysia School of Minerals Metallurgical and Materials EngineeringIndian Institute of Technology BhubaneswarBhubaneswar 751007India

Magnesium-based biomaterials have recently gained great attention as promising candidates for the new generation of biodegradable *** study investigated the mechanical performance and biodegradation behaviour of magnesium-zinc/hydroxyapatite(Mg-Zn/HA)composites fabricated by different powder mixing techniques.A single step mixing process involved mechanical alloying or mechanical milling techniques,while double step processing involved a combination of both mechanical alloying and mechanical *** mechanical properties of the composite were observed when the powders were prepared using single step processing via mechanical alloying ***,Mg-Zn/HA composite fabricated through single step processing via mechanical milling technique was found to have the most desirable low degradation rate coupled with highest *** composite achieved the lowest degradation rate of 0.039×10^−3 mm/year as measured by immersion test and 0.0230 mm/year as measured by electrochemical ***:P ratio of the composite also slightly more than enough to aid the initial bone mineralization,that is 1:1.76,as the required Ca:P ratio for initial bone mineralization is between 1:1 and 1:1.67.

关键词： Magnesium-based composite Biodegradable implant Powder metallurgy Mechanical alloying Mechanical milling

Numerical Simulations of One-Directional Fractional Pharmacokinetics Model

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Computers, Materials & Continua 2022年第12期73卷 4923-4934页

作者： nursyazwani mohamad Noor Siti Ainor Mohd Yatim nur Intan Raihana Ruhaiyem School of Distance Education Universiti Sains MalaysiaUSM PenangPenang11800Malaysia School of Computer Science Universiti Sains MalaysiaUSM PenangPenang11800Malaysia

In this paper,we present a three-compartment of pharmacokinetics model with irreversible rate *** compartment consists of arterial blood,tissues and venous ***’s principle and the law of mass action were used to develop the model based on the diffusion *** model is modified into a fractional pharmacokinetics model with the sense of Caputo *** existence and uniqueness of the model are investigated and the positivity of the model is *** behaviour of the model is investigated by implementing numerical algorithms for the numerical solution of the system of fractional differential *** software is used to plot the graphs for illustrating the variation of drug concentration concerning ***,the numerical simulations of the model are presented for different values ofαwhich verified the theoretical ***,we also observed the pattern of the simulations at the three-compartment of the model by using different values of initial conditions.

关键词： Pharmacokinetics model Irreversible rate Fractional order Numerical simulations

Zero-Index Metamaterial Superstrates UWB Antenna for Microwave Imaging Detection

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Computers, Materials & Continua 2023年第4期75卷 277-292页

作者： Mohd Aminudin Jamlos nur Amirah Othman Wan Azani Mustafa Mohd Faizal Jamlos mohamad nur Khairul Hafizi Rohani Faculty of Electronic Engineering Technology Universiti Malaysia PerlisPauh Putra Campus02600ArauMalaysia Faculty of Electrical Engineering Technology Universiti Malaysia PerlisPauh Putra Campus02600ArauMalaysia Faculty of Mechanical and Manufacturing Engineering Universiti Malaysia Pahang26600PekanMalaysia

Metamaterials(MTM)can enhance the properties of microwaves and also exceed some limitations of devices used in technical *** that the antenna is the element for realizing a microwave imaging(MWI)system since it is where signal transmission and absorption ***-Wideband(UWB)antenna superstrates with MTM elements to ensure the signal transmitted from the antenna reaches the tumor and is absorbed by the same *** lack of conventional head imaging techniques,for instance,Magnetic Resonance Imaging(MRI)and Computerized Tomography(CT)-scan,has been demonstrated in the paper focusing on the point of failure of these techniques for prompt diagnosis and portable ***,the importance ofMWIhas been addressed elaborately to portray its effectiveness and aptness for a primary tumor *** than that,MTM element designs have been discussed thoroughly based on their performances towards the contributions to the better image resolution of MWI with detailed *** paper proposes the novel design of a Zeroindex Split RingResonator(SRR)MTMelement superstrate with a UWB antenna implemented in MWI systems for detecting *** novel design of the MTM enables the realization of a high gain of a superstrate UWB antenna with the highest gain of 5.70 *** that,the MTM imitates the conduct of the zeroreflection phase on the resonance frequency,which does not *** antenna with an MTM unit is of a 7×4 and 10×5 Zero-index SRR MTM element that acts as a superstrate plane to the *** from that,Rogers(RT5880)substrate material is employed to fabricate the designed MTM unit cell,with the following characteristics:0.51mm thickness,the loss tangent of 0.02,as well as the relative permittivity of 2.2,with Computer Simulation Technology(CST)performing the simulation and *** MTM unit cells of 7×4 and 10×5 attained 0°with respect to the reflection phase at the 2.70 GHz frequency *** first design,MTM Antenna Design 1,c

关键词： Zero-index metamaterial(ZIM) ultra-wideband(UWB) microwave imaging(MWI)detection

Mixed Convection of Non-Newtonian Erying Powell Fluid with Temperature-Dependent Viscosity over a Vertically Stretched Surface

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Computers, Materials & Continua 2021年第1期66卷 421-435页

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

The viscosity of a substance or material is intensely influenced by the temperature,especially in the field of lubricant engineering where the changeable temperature is well *** this paper,the problem of temperature-dependent viscosity on mixed convection flow of Eyring Powell fluid was studied together with Newtonian heating thermal boundary *** flow was assumed to move over a vertical stretching *** model of the problem,which is in partial differential equations,was first transformed to ordinary differential equations using appropriate *** approach was considered to reduce the complexity of the ***,the transformed equations were solved using the Keller box method under the finite difference scheme *** validation process of the results was performed,and it was found to be in an excellent *** results on the present computation are shown in tabular form and also graphical *** major finding was observed where the skin friction and Nusselt number were boosted in the strong viscosity.

关键词： Temperature-dependent viscosity Erying Powell fluid numerical solution combined convection

Feasibility of Integrating Bimetallic Au-Ag Non-Alloys Nanoparticles Embedded in Reduced Graphene Oxide Photodetector

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Photonic Sensors 2023年第3期13卷 23-36页

作者： nurul Syazwani ROHIZAT Muhammad nur Syafiq mohamad ISMAIL Muhammad Aiman Saufi AHMAD FAHRI Chee Leong TAN Rozalina ZAKARIA Photonics Research Center Faculty of ScienceUniversity of MalayaKuala Lumpur 50603Malaysia Department of Physics Faculty of ScienceUniversity of MalayaKuala Lumpur 50603Malaysia School of Electronic and Optical Engineering and College of Microelectronics Nanjing University of Posts and TelecommunicationsNanjing 210023China

To coordinate the resonant wavelength of the plasmonic nanoparticles(NPs),the emission band of the reduced graphene oxide(rGO)photodetector at the NIR-region is crucial for the optimal plasmon-enhanced luminescence in the *** contrast to monometallic NPs,where limits the dimensions and extended resonant wavelength,we integrated an Au-Ag bimetallic NPs(BMNPs)to enable resonance tuning at the longer wavelength at the excitation source of 785 *** features showed an increase in radiative recombination rates as well as the quantum yield efficiency of the *** BMNPs were produced from the dewetting process of 600℃and 500℃,both at 1 min after the deposition thickness layer of Au(8 nm)and Ag(10 nm)on the Si substrate using the electron-beam evaporation *** BMNPs-rGO photodetector exhibited the responsivity of 2.25 A·W^(–1),Jones of specific detectivity of 2.45×10^(11)Jones,and external quantum efficiency(EQE)of 356%.The rise time and fall time for the photodetector were 32 ns and 186 ns,*** work provided an essential information to enable the versatile plasmon-enhanced application in 2-dimensional(2D)material optoelectronic devices.

关键词： Au-Ag bimetallic nanoparticles rGO photodetector

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

Medi-Block Record Secure Data Sharing in Healthcare System:Issues,Solutions and Challenges

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Computer Systems Science & Engineering 2023年第12期47卷 2725-2740页

作者： Zuriati Ahmad Zukarnain Amgad Muneer nur Atirah mohamad Nassir Akram A。Almohammedi Faculty of Computer Science and Information Technology University Putra MalaysiaSeri Kembangan43400Malaysia Department of Computer and Information Sciences Universiti Teknologi PETRONASSeri Iskandar32160Malaysia Centre for Research in Data Science(CeRDaS) Universiti Teknologi PETRONASSeri Iskandar32610Malaysia Automobile Transportation Department South Ural State UniversityChelyabinsk454080Russia Electrical and Electronics Engineering Department Karabük UniversityKarabük78050Turkey

With the advancements in the era of artificial intelligence,blockchain,cloud computing,and big data,there is a need for secure,decentralized medical record storage and retrieval *** cloud storage solves storage issues,it is challenging to realize secure sharing of records over the ***-block record in the healthcare system has brought a new digitalization method for patients’medical *** centralized technology provides a symmetrical process between the hospital and doctors when patients urgently need to go to a different or nearby *** enables electronic medical records to be available with the correct authentication and restricts access to medical data ***-block record is the consumer-centered healthcare data system that brings reliable and transparent datasets for the medical *** study presents an extensive review of proposed solutions aiming to protect the privacy and integrity of medical data by securing data sharing for Medi-block *** also aims to propose a comprehensive investigation of the recent advances in different methods of securing data sharing,such as using Blockchain technology,Access Control,Privacy-Preserving,Proxy Re-Encryption,and Service-On-Chain ***,we highlight the open issues and identify the challenges regarding secure data sharing for Medi-block records in the healthcare systems.

关键词： Medi-block record healthcare system Blockchain technology secure data sharing

Validation of the trauma mortality prediction scores from a Malaysian population

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Burns & Trauma 2017年第4期5卷 254-259页

作者： Jih Huei Tan Henry Chor Lip Tan nur Azlin Md Noh Yuzaidi mohamad Rizal Imran Alwi General Surgery Department Hospital Sultanah Aminah Johor Bahru Malaysia Pusat Perubatan Universiti Kebangsaan Malaysia Cheras Malaysia Clinical Research Centre Hospital Sultan Ismail Johor Bahru Malaysia General Surgery Department Hospital Sultanah Aminah Johor Bahru Malaysia

Background:Well-known trauma mortality prediction scores such as New Injury Severity Score (NISS), Revised Trauma Score (RTS), and Trauma and Injury Severity Score (TRISS) have been externally validated from high-income countries with established trauma databases. However, these scores were never used in Malaysian population. In this current study, we attempted to validate these scoring systems using our regional trauma surgery database. Methods:A retrospective analysis of the regional Malaysian Trauma Surgery Database was performed over a period of 3 years from May 2011 to April 2014. NISS, RTS, Major Trauma Outcome Study (MTOS)-TRISS, and National Trauma Database (NTrD)-TRISS scores were recorded and calculated. Individual scoring system's performance in predicting trauma mortality was compared by calculating the area under the receiver operating characteristic (AUC) curve. Youden index and associated optimal cutoff values for each scoring system was calculated to predict mortality. The corresponding positive predictive value, negative predictive value, and accuracy of the cutoff values were calculated. Results:A total of 2208 trauma patients (2004 blunt and 204 penetrating injuries) with mean age of 36 (SD=16) years were included. There were 239 deaths with a corresponding mortality rate of 10.8%. The AUC calculated for the NISS, RTS, MTOS-TRISS, and NTrD-TRISS were 0.878, 0.802, 0.812, and 0.848, respectively. The NISS score with a cutoff value of 24, sensitivity of 86.6%and specificity of 74.3%, outperformed the rest (p<0.001). Mortality was predicted by NISS with an overall accuracy of 75.6%;its positive predictive value was at 29.02%and negative predictive value at 97.86%. Conclusion:Amongst the four scores, the NISS score is the best trauma mortality prediction model suited for a local Malaysian trauma population. Further validation with multicentre data in the country may require to ascertain the finding.

关键词： Trauma scoring system Prediction model Injury grading Southeast Asia New Injury Severity Score Revised Trauma Score Trauma and Injury Severity Score