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Application of in-house method for determinationof radium isotopes in environmental samples usingthe Liquid Scintillation counting technique

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Journal of Analytical Sciences, Methods and Instrumentation 2011年第1期1卷 1-8页

作者： nik azlin nik ariffin Zal Uyun Wan Mahmood Che Abd Rahim Mohamed 不详

A method for determination of 226Ra and 228Ra in environmental samples using the α-β coincidence liquid scintillation counting (LSC) has been developed. Radium were preconcentrated from environmental samples by coprecipitation with BaSO4, then purified from others radionuclide interferences using the cation column exchange (Bio-Rad AG 50 W-X4 resin with 200-400 mesh size and H+ form) and operating in warm temperature which is between 70-80oC. Then, the Ba(Ra)SO4 precipitate was filtered through the Millipore filter paper, dried and weighed to calculate chemical yield. The activity concentration of radium isotopes in mixture of liquid scintillation cocktails were measured using LSC after being stored for over 21 days to allow the growth of the progeny nuclides. The method has been validated with a certi-fied reference material supplied by the International Atomic Energy Agency and reliable results were obtained. The radiochemical yields for radium were 59% - 90% and recovery was 97% and 80% for 226Ra and 228Ra, respectively. Sixteen seawater and fish flesh samples collected in Kapar coastal water have been analyzed with the developed method. The obtained radium activity concentrations in seawater were in the range of 02.08 ± 0.82 mBq/L to 3.69 ± 1.29 mBq/L for 226Ra and 6.01 ± 3.05 mBq/L to 17.07 ± 6.62 mBq/L for 228Ra. Meanwhile, the activity concentrations of 226Ra and 228Ra in fish flesh were in the range of 11.82 ± 5.23 – 16.53 ± 6.53 Bq/kg dry wt. and 43.52 ± 16.34 – 53.57 ± 19.86 Bq/kg dry wt., respectively.

关键词： 226Ra 228Ra Environmental Samples Chemical Yield Liquid Scintillation Counting

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Zinc Oxide Nano Particles Integrated Kenaf/Unsaturated Polyester BioComposite

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Journal of Renewable Materials 2019年第10期7卷 967-982页

作者： Mohammed Mohammed Bashir O.Betar Rozyanty Rahman Aeshah M.Mohammed azlin F.Osman Muhammed Jaafar Tijjani Adam Omar S.Dahham Uda Hashim nik Z.Noriman Center of Excellence Geopolymer and Green Technology School of Materials EngineeringUniversiti Malaysia PerlisKangarPerlisMalaysia Research Center(NANOCAT) University of MalayaKuala LumpurMalaysia College of Health Solutions.Health North Building Arizona State UniversityArizonaUSA College of Education for Pure Science Ibn-Alhaitham University of BagdadBagdadIraq Faculty of Engineering Technology Universiti Malaysia PerlisKampus Uniciti Alam Sg.ChuchuhPadang Besar(U)PerlisMalaysia Institute of Nano Electronic Engineering Universiti Malaysia PerlisKangarPerlisMalaysia.

Increasing need for materials with special features have brought various new inventions,one of the most promising hope for new material with special features and functionalities is composites ***,this study report an integration of zinc nanoparticles into kenaf/polyester polymer composite to introduce new behavior to the *** composite behaviors were compared for mechanical,thermal,moisture absorption and biodegradability *** Zinc Oxide nanoparticles entrenched in the kenaf/polyestaer composites net structure through chemical bonds between kenaf/ZnO/polyester resin,existence of ZnO significantly influence the mechanical and thermals properties of *** analysis based on(TGA)response revealed the integration of ZnO nanoparticles improved the thermal stability when thermal decomposition temperature beyond 3650 *** thermal cracking decreased with present of ZnO and increase with kenaf content(layers).The modulus,Tensile strength,break at elongation,flexural modulus,flexural strength and impact strength of the composites with higher content kenaf/ZnO nanoparticle are 560 MPa,58MPa,1.8%,1300 PMa,68 MPa and 31 MPa,***,addition of kenaf layers and ZnO results in larger mechanical properties enhancement,the results of the contact angle show improvement in wetting of the fibres with addition of ZnO nanoparticles.

关键词： Polymer composite thermal properties mechanical properties nano-composite biodegradable polymer nano zinc oxide

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Prevalence and Factors Associated with Smartphone Addiction among Adolescents–A Nationwide Study in Malaysia

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International Journal of Mental Health Promotion 2023年第2期25卷 237-247页

作者： Kai Wei Lee Siew Mooi Ching Norsiah Ali Chor Yau Ooi Shahnul Kamal Hj Sidek azlin Amat Yusnita Yatim Zaiton Yahaya Nabihah Shamsuddin Idora Ibrahim Fauzia Abdul Majid Fazlin Suhana Othman nik Suhaila Zakaria Artini Abidin Nor Hazlin Talib Dhashani Sivaratnam Department of Pre-Clinical Sciences Faculty of Medicine and Health SciencesUniversiti Tunku Abdul RahmanKajangSelangor43000Malaysia Department of Family Medicine Faculty of Medicine and Health SciencesUniversiti Putra MalaysiaSerdang43400Malaysia Klinik Kesihatan Masjid Tanah Ministry of Health MalaysiaMasjid Tanah78300Malaysia Department of Family Medicine Universiti Malaysia SarawakKota Samarahan94300Malaysia Klinik Kesihatan Tanjung Malim Ministry of Health MalaysiaTanjung Malim35900Malaysia Klinik Kesihatan Hiliran Ministry of Health MalaysiaKuala Terengganu20300Malaysia Klinik Kesihatan Bandar Pekan Ministry of Health MalaysiaPekan26600Malaysia Klinik Kesihatan Sandakan Ministry of Health MalaysiaSandakan90000Malaysia Klinik Kesihatan Serting Hilir Ministry of Health MalaysiaBandar Seri Jempol72120Malaysia Klinik Kesihatan Kuala Perlis Ministry of Health MalaysiaKuala Perlis02000Malaysia Klinik Kesihatan Kempas Ministry of Health MalaysiaJohor Bahru81200Malaysia Klinik Kesihatan Kuala Kedah Ministry of Health MalaysiaKuala Kedah06600Malaysia Klinik Kesihatan Bandar Gua Musang Ministry of Health MalaysiaGua Musang18300Malaysia Klinik Kesihatan Kepala Batas Ministry of Health MalaysiaKepala Batas13200Malaysia Klinik Kesihatan Kajang Ministry of Health MalaysiaKajang43000Malaysia Department of Ophthalmology Faculty of Medicine and Health SciencesUniversiti Putra MalaysiaSerdang43400Malaysia

Smartphone ownership among adolescents is getting common in this decade especially in Malaysia;Adolescent are strongly devoted to their smartphone and this may lead to smartphone *** have reported that smartphone addiction has become an emerging social and health problem especially among the youth in many countries however there is lack of study among adolescents in *** study aimed to examine the prevalence and factors associated with smartphone addiction among adolescents in *** was a cross-sectional study involving adolescents from 15 primary care clinics throughout the *** were assessed on their smartphone activities using the Malaysian short version of the Smartphone addiction scale(SAS-M-SV).Multiple logistic regression was used to determine the predictors of smartphone addiction among *** study was conducted among 921 adolescents with 49.6%male(n=457).The mean age of adolescents was 16.4±2.4 *** ethnicity distribution were 74.6%Malay,7.3%Chinese,4.7%Indian and 13.4%other *** prevalence of smartphone addiction was 37.1%(342/921);37.4%in male and 36.9%in *** on multiple logistic regression analysis,longer duration of smartphone use per week was associated with higher odds of smartphone addiction among adolescent(odd ratio=1.005%,95%confidence interval=1.000–1.009,p-value=0.039).Smartphone addiction is present in nearly four in ten adolescents in *** who spend longer duration in smartphone usage per week were associated with higher odds of having smartphone *** should be more alert and vigilant about this ***,parents should limit their children from spending too much of time with smartphone in order to prevent their children from getting smartphone addiction.

关键词： Addiction smartphone adolescents Malaysia internet

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