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Journal of Electronic Science and Technology 2016年第3期14卷 199-204页

作者： Michael David mohd haniff ibrahim Sevia Mahdaliza Idrus nor hafizah ngajikin Asrul Izam Azmi Tay Ching En Marcus Faculty of Electrical Engineering Universiti Teknologi Malaysia81310 Skudai the faculty of engineering and computing first city university college47800 Petaling JayaMalaysia

Ozone is a green house gas. Ozone absorption cross sections have been reported with discrepancies and inconsistencies. In this paper, simultaneous effects of the optical path length and temperature variations on ozone gas absorption cross sections are investigated at different wavelengths. HITRAN 2012, the latest available line list on *** simulator, is used in this study to simulate ozone gas absorption cross sections in relation to the simultaneous effects of the optical path length and temperature at the wavelengths of 603 nm and 575 nm. Results obtained for gas cells with the optical path length from 10 cm to 120 cm show that the decrease in temperatures from 313 K to 103 K results in the increase in ozone gas absorption cross sections. At wavelengths of 603 nm and 575 nm, the percentage increase of ozone gas absorption cross sections is 1.22% and 0.71%, respectively. Results obtained in this study show that in the visible spectrum, at constant pressure, ozone gas absorption cross sections are dependent on the temperature and wavelength but do not depend on the optical path length. Analysis in this work addresses discrepancies in ozone gas absorption cross sections in relation to the temperature in the visible spectrum; thus, the results can be applied to get optimal configuration of high accuracy ozone gas sensors.

关键词： Index Terms--Absorption cross sections length ozone pressure transmittance visible spectrum.

Spectrophotometer with enhanced sensitivity for uric acid detection

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Chinese Optics Letters 2019年第8期17卷 66-70页

作者： Nurfatihah Che Abd Rashid nor hafizah ngajikin Asrul Izam Azmi Rashidah Arsat Suhaila Isaak noran Azizan Cholan Nur Ellina Azmi Faculty of Electrical Engineering Universiti Teknologi Malaysia 81310 Johor Bahru Johor Malaysia Faculty of Electrical and Electronic Engineering Universiti Tun Hussein Onn Malaysia 86400 Bt. Pahat Johor Malaysia Industrial Biotechnology Research Centre SIRIM Berhad 40200 Shah Alam Selangor Malaysia

A spectrophotometer with an LED as the light source for uric acid detection is proposed in this work. The mechanism of uric acid detection is based on energy absorbed by sodium urate, which is a chemical product of uric acid and sodium hydroxide solution. For the performance validation, comparison between the spectrophotometer with an LED and halogen lamp is carried out. Measurement results suggest that the spectrophotometer system with LED light has better sensitivity than that with halogen light. At a 460 nm wavelength,the sensitivity for the spectrophotometer with an LED is 0.0046 dL/mg, which is 73% higher than that with halogen light that records 0.0012 dL/mg. This enhanced sensitivity is attributed to the higher luminous efficacy of the LED light beam. As a result, a larger amount of flux interacts with the sample, leading to the sensitivity enhancement. The spectrophotometer with an LED is also applied for the detection of uric acid in a real human urine sample. Based on the experimental data at a 460 nm wavelength, the method manages to achieve the sensitivity of 0.0016 dL/mg, accuracy of 96.01%, limit of detection of 4.79 mg/dL, and limit of quantification of 14.52 mg/dL. These findings show that the use of LED as the input light source is promising for the spectrophotometer.

关键词： spectrophotometer mechanism show

Permittivity models for determination of moisture content in Hevea Rubber Latex

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International Journal of Agricultural and Biological Engineering 2014年第5期7卷 48-54页

作者： nor Zakiah Yahaya Zulkifly Abbas Nursakinah Mohamad Ibrahim Mardiah hafizah Muhammad Hafizi Muhamad Zamri Yahaya Department of Physics Faculty of ScienceUniversiti Putra Malaysia43400 UPM SerdangSelangor Darul EhsanMalaysia School of Materials and Mineral Resources Engineering Universiti Sains Malayisa14300Nibong TebalPulau PinangMalaysia

The commercial open-ended coaxial probe(Agilent 85070E)is the most commonly used sensor to determine the permittivity of wet *** paper extends the usability and applicability of the sensor to the estimation of moisture content in Hevea Rubber *** dielectric constant and loss factor were measured using the commercial probe whilst the moisture contents were obtained using the standard oven drying *** results were obtained between the different dielectric models to predict moisture content in *** the dielectric constant and the loss factor of rubber latex linearly increased with moisture content at all selected *** equations were established to relate both the dielectric constant and the loss factor with moisture *** equations were used to predict moisture content in Hevea latex from measured values of the dielectric constant and the loss *** lowest mean relative error between actual and predicted moisture contents was 0.02 at 1 GHz when using the Cole-Cole dielectric constant calibration equation.

关键词： open-ended coaxial probe permittivity models Hevea Rubber Latex moisture rubber content

Effect of coenzyme Q10 supplementation on post-vitrification mouse embryo development

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Asian pacific Journal of Reproduction 2024年第3期13卷 126-132页

作者： Anisa-Annur S Wan-hafizah WJ nor-Ashikin MNK Muhammad-Zaki R Faculty of Pharmacy and Health Sciences Royal College of Medicine PerakUniversiti Kuala Lumpur30450 IpohPerakMalaysia Maternofetal and Embryo Research Group Faculty of MedicineUniversiti Teknologi MARASelangor BranchSungai Buloh Campus47000 Sungai BulohSelangorMalaysia

Objective:To investigate the effects of coenzyme Q10(CoQ10)supplementation on post-vitrification embryo development and gross ***:Balb/c mouse embryos were cultured in potassium simplex optimised medium(KSOM)with varying CoQ10 concentrations[0(control),20,40,and 60μM].The most effective CoQ10 concentration(40μM)was selected for subsequent post-vitrification morphology *** were randomly divided into four groups:Group A(non-vitrified without CoQ10),Group B(non-vitrified with CoQ10),Group C(vitrified without CoQ10),and Group D(vitrified with CoQ10),followed by vitrification at the 8-cell *** rates and development until the blastocyst stage were evaluated through morphological examinations using ASEBIR's system,distinguishing normal and abnormal ***:Supplementation of 40μM CoQ10 significantly increased blastocyst formation(95%)compared to the control group(92%),20μM(62%),and 60μM(56%)(P<0.001).Following vitrification,Group D exhibited a significant increase in blastocyst formation(92%)compared to Group C(82%)(P<0.05).Morphological assessments indicated superior embryo quality in Group B over Group D during the cleavage stage,morula,and blastocyst(P<0.05).Conclusions:CoQ10 supplementation exhibits promising potential to enhance preimplantation embryo development,increase blastocyst formation rates,and improve embryo quality *** offers a promising approach to mitigate oxidative stress on embryos,potentially improving overall assisted reproductive technology outcomes.

关键词： Coenzyme Q10 Antioxidant Embryo development Vitrification Morphology Assisted reproductive technology

Piper sarmentosum as an antioxidant on oxidative stress in human umbilical vein endothelial cells induced by hydrogen peroxide

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2010年第5期11卷 357-365页

作者： Abdul Hamid hafizah Zakaria ZAITON Amom ZULKHAIRI Adenan MOHD ILHAM Megat Mohd nordin nor ANITA Abdullah Mahdy ZALEHA Department of Physiology Universiti Kebangsaan Malaysia Medical CentreJalan Raja Muda Aziz50300 Kuala LumpurMalaysia Department of Human Anatomy Division of PhysiologyFaculty of Medicine and Health SciencesUniversiti Putra Malaysia Forest Research Institute of Malaysia Department of Obstetrics and Gynecology Universiti Kebangsaan Malaysia Medical Centre

Endothelial cell death due to increased reactive oxygen species(ROS) may contribute to the initial endothelial injury,which promotes atherosclerotic lesion *** sarmentosum(PS),a natural product,has been shown to have an antioxidant property,which is hypothesized to inhibit production of ROS and prevent cell ***,the present study was designed to determine the effects of PS on the hydrogen peroxide(H2O2)-induced oxidative cell damage in cultured human umbilical vein endothelial cells(HUVECs).In this experiment,HUVECs were obtained by collagenase perfusion of the large vein in the umbilical cord and cultured in medium M200 supplemented with low serum growth supplementation(LSGS).HUVECs were treated with various concentrations of H2O2(0-1000 μmol/L) and it was observed that 180 μmol/L H2O2 reduced cell viability by 50% as denoted by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide(MTT) *** the above concentration as the positive control,the H2O2-induced HUVECs were concomitantly treated with various concentrations(100,150,250 and 300 μg/ml) of three different extracts(aqueous,methanol and hexane) of ***(MDA),superoxide dismutase(SOD),catalase(CAT) and glutathione peroxidase(GPX) levels showed a significant increase(P<0.05) in HUVECs compared to the negative ***,PS extracts showed a protective effect on HUVECs from H2O2-induced cell apoptosis with a significant reduction in MDA,SOD,CAT and GPX levels(P<0.05).Furthermore,PS had exhibited ferric reducing antioxidant power with its high phenolic ***,it was concluded that PS plays a beneficial role in reducing oxidative stress in H2O2-induced HUVECs.

关键词： Piper sarmentosum Human umbilical vein endothelial cells(HUVECs) Malondialdehyde Oxidative stress Antioxidant enzymes

Redefining biofuels:Investigating oil palm biomass as a promising cellulose feedstock for nitrocellulose-based propellant production

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Defence Technology（防务技术） 2024年第7期37卷 111-132页

作者： Khoirul Solehah binti Abdul Rahim Alinda binti Samsuri Siti Hasnawati binti Jamal Siti Aminah binti Mohd nor Siti nor Ain binti Rusly hafizah binti Ariff Nur Shazwani binti Abdul Latif Centre for Tropicalization(CENTROP) Defence Research InstituteUniversiti Pertahanan Nasional MalaysiaKem Sungai Besi57000 Kuala LumpurMalaysia Department of Chemistry and Biology Centre for Defence Foundation StudiesUniversiti Pertahanan Nasional MalaysiaKem Sungai Besi57000 Kuala LumpurMalaysia

This review paper explores the potential of oil palm biomass as a valuable cellulose source for the production of nitrocellulose-based propellants,contributing to the green revolution and sustainable energy *** highlights the availability of the corresponding biomass in Malaysia and in line with global studies,the chemical compositions,as well as a brief description of current technologies for converting biomass of oil palm into value added products specifically *** to achieve maximum utilization of biomass from oil palm industry for cellulose production and prospective source for nitrocellulose-based propellant are also *** methodology section outlines the pretreatment of lignocellulosic fibres,cellulose extraction,and nitrocellulose production ***,the review underscores the prospective of palm oil biomass as a sustainable cellulose source for propellant manufacturing,while acknowledging the need for further research and advancements in the field.

关键词： Biopolymer Cellulose nitrate Energetic materials Green technology Palm oil

The Growth Study of Vero Cells in Different Type of Microcarrier

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Materials Sciences and Applications 2010年第5期1卷 261-266页

作者： Yusilawati Ahmad nor Nurul hafizah Sulong Maizirwan Mel Hamzah Mohd Salleh Iis Sopyan 不详

The fact of microcarrier (MC) culture introduces new possibilities and makes possible the practical high-yield culture of anchorage-dependent cells has generated a considerable focus in this study. The objective of this research was to study the comparison of Vero cell growth on different types of commercial microcarriers;Cytodex-1, Cytodex-3, Hil-lex? II and Plastic Plus in spinner vessel and two liters bioreactor cultured for 96 hours. Biological performance of the microcarrier in RPMI media showed the preference of Vero cell grew on Cytodex 3 microcarriers with highest maximum viable cell number (2.4 × 105 cells/ml) followed by Cytodex 1, Hillex and Plustic Plus. Vero cell on Cyto-dex-3 data in spinner flask was compared in bioreactor and result showed higher viable cell number in biorector. Thus, this dextran-crosslink gelatin microcarrier (Cytodex 3) provided the best surface for cell attachment and fast proliferation. At the end of this cell growth improvement will be used for virus transfection producing a vaccine in bioreactor.

关键词： Cytodex 3 Microcarrier Spinner Flask Vero Cells Vaccines

Translation and Validation of Malay Version 5-Items Brief Illness Perception Questionnaire, BIP-Q5 towards COVID-19 among Malaysian Nurses

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Advances in Infectious Diseases 2022年第3期12卷 383-391页

作者： hafizah Pasi nor Azam Kamaruzaman Nadzirah Ahmad Basri Nur Hakimah A. Manan Hashima E. Nasreen Department of Community Medicine Kulliyyah of Medicine International Islamic University Malaysia Kuantan Malaysia Department of Family Medicine Kulliyyah of Medicine International Islamic University Malaysia Kuantan Malaysia Department of Psychiatry Kulliyyah of Medicine International Islamic University Malaysia Kuantan Malaysia Department of Psychiatry and Mental Health Sultan Ahmad Shah Medical Centre (SASMEC) Kuantan Malaysia

Introduction: Currently, own individual perception is recognized as one of the important factors in the prevention of disease, including coronavirus disease, COVID-19. Given the massive impact of COVID-19 on all population’s life, including nurses as one of the main health services providers in the country, this study aims to translate and validate the Malay Version 5-Items Brief Illness Perception Questionnaire, BIP-Q5 towards COVID-19 among Malaysian nurses. Materials and Methods: Forward and backward translations and pretesting of the BIP-Q5 to Malay were conducted among nurses, subject matter experts, and language professionals. The validations process was elicited through an online cross-sectional study involving 56 nurses based on a ~10:1 subject-to-items ratio sample size estimations. Results: The principal component analysis (PCA) revealed one best component with eigenvalues more than one, confirming the questionnaire’s original version. There are five items within the single component, and all are with weightage of over 43%. The scree plot supported the findings, which showed that at least one factors are suitable to be retained. The overall Cronbach’s α coefficient was 0.7 and the intraclass correlation coefficient was 0.659. The Kaiser-Meyer-Olkin was 0.655, and Bartlett’s test of sphericity p-value was Conclusion: This study showed that the translated Malay Version 5-Items Brief Illness Perception Questionnaire, BIP-Q5 has a good psychometric property, and is a valid and reliable tool to be used to measure illness perceptions towards COVID-19 among Malaysian nurses.

关键词： Validation Malay BIP-Q5 COVID-19 Nurses

Arsenic Detection Using Surface Plasmon Resonance Sensor With Hydrous Ferric Oxide Layer

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Photonic Sensors 2022年第3期12卷 30-37页

作者： Yasmin MUSTAPHA KAMIL Sura Hmoud AL-REKABI Muhammad Hafiz ABU BAKAR Yap Wing FEN Husam Abduldaem MOHAMMED nor hafizah MOHAMED HALIP Mohammed Thamer ALRESHEEDI Mohd Adzir MAHDI inLAZER Dynamics Sdn Bhd InnoHub UnitPutra Science ParkUniversiti Putra MalaysiaSerdang 43400Malaysia Electrical Engineering Department Al Suwayrah Technical InstituteMiddle Technical UniversityBaghdad 10074Iraq Wireless and Photonic Networks Research Centre Faculty of EngineeringUniversiti Putra MalaysiaSerdang 43400Malaysia Institute of Advanced Technology Universiti Putra MalaysiaSerdang 43400Malaysia Department of Physics Faculty of ScienceUniversiti Putra MalaysiaSerdang 43400Malaysia Electronic and Communication Engineering Department College of EngineeringUniversity of BaghdadBaghdad 10071Iraq Department of Electrical Engineering College of EngineeringKing Saud UniversityRiyadh 11421Kingdom of Saudi Arabia

The lethality of inorganic arsenic(As)and the threat it poses have made the development of efficient As detection systems a vital *** research work demonstrates a sensing layer made of hydrous ferric oxide(Fe_(2)H_(2)O_(4))to detect As(Ⅲ)and As(Ⅴ)ions in a surface plasmon resonance *** sensor conceptualizes on the strength of Fe_(2)H_(2)O_(4) to absorb As ions and the interaction of plasmon resonance towards the changes occurring on the sensing *** sensitivity values for As(Ⅲ)and As(Ⅴ)were 1.083°·ppb^(–1) and 0.922°·ppb^(-1),respectively,while the limit of detection for both ions was 0.6 *** findings support the feasibility and potential of the sensor configuration towards paving future advancement in As detection systems.

关键词： Surface plasmon resonance di-iron trioxide hydrate arsenic heavy metals ion optical sensor