http://mjs.um.edu.my/index.php/MJS/issue/feed Malaysian Journal of Science 2022-06-15T16:39:18+08:00 Prof. Dr. Wan Haliza binti Abd Majid mjs_um@um.edu.my Open Journal Systems <p style="text-align: justify;">Malaysian Journal of Science (MJS) is the official peer-reviewed open access journal of the <a href="https://fs.um.edu.my/">Faculty of Science, University of Malaya</a>. Effective from year 2020 onwards, the frequency of regular issues publication is three times a year. MJS is indexed in Scopus, EMBASE, Compendex, GEOBASE, EMBiology, Elsevier BIOBASE, FLUIDEX ,World Textiles, CAB Abstracts, Chemical Abstracts Service Database and ASEAN Citation Index (ACI).</p> <p style="text-align: justify;">MJS is a reputable journal with a growing number of audience, which focuses on current developments in all disciplines of science. The journal publishes original articles, review articles, short communications and case reports that are of importance to the scientific community. </p> <p style="text-align: justify;"><strong>eISSN : 2600-8688<br /></strong><strong><strong>Print ISSN : 1394-3065<br /></strong></strong><strong><strong>Publisher : Faculty of Science, University of Malaya</strong></strong> </p> http://mjs.um.edu.my/index.php/MJS/article/view/30269 A THEORETICAL FRAMEWORK FOR IMPROVING HAND HYGIENE COMPLIANCE: A SYSTEMATIC REVIEW 2021-09-23T14:44:46+08:00 Mohadeseh Motamed-Jahromi mohadesehmotamed@gmail.com Mohammad Hossein Kaveh mhkaveh255@gmail.com <p>Evidence before the COVID-19 outbreak indicated that healthcare workers’ hand hygiene compliance had been low. Although hand hygiene compliance has improved during the COVID-19 pandemic, it's necessary to plan a tailored and targeted hand hygiene promotion strategy to maintain changes. Therefore, the aim of this review was to assess experimental theory-based studies on hand hygiene improvement in order to identify the best theory and constructs with higher effectiveness. The study design is a systematic review. The search strategy was developed, and Medline (PubMed), ProQuest, Web of Knowledge, Scopus, Cochrane Trials, and Science Direct databases were searched up to May 26, 2020, without time limitation. Review Manager 5.1 software was used to determine the risk of bias. Irrelevant articles, non-original articles, non-interventional studies, and those that lacked a theoretical framework were excluded. A total of eight articles were entered into the final analysis, including three randomized clinical trials and five quasi-experimental studies. In these studies, theories were reported at intrapersonal, interpersonal, and organizational levels. Moreover, some studies evaluated multifaceted interventions involving various levels of influence. Finally, we suggested an integrated multi-level approach to promote hand hygiene (IMAPH) with a comprehensive theoretical framework for designing interventions.</p> <p><strong>Keywords</strong>:&nbsp;&nbsp; Healthcare workers, Hand hygiene, Theory-based intervention, Systematic review, Multi theory model</p> 2022-06-15T00:00:00+08:00 Copyright (c) 2022 Malaysian Journal of Science http://mjs.um.edu.my/index.php/MJS/article/view/33591 COMPARATIVE ANALYSIS OF DAMD, ISSR AND SCOT MOLECULAR MARKERS ON CRYOPRESERVED LUDISIA DISCOLOR AXILLARY BUDS 2022-01-20T14:18:30+08:00 Sreeramanan Subramaniam sreeramanan@gmail.com Kirutika Selva Rajan kirutika28@gmail.com Hazirah Burkhan xiraburkhan@yahoo.com Bee Lynn Chew beelynnchew@usm.my Suganthi Appalasamy suganthi.a@umk.edu.my Ranjetta Poobathy ranjetta.poobathy@qiup.edu.my <p>Ludisia discolor, a jewel orchid is the only species found under its genus (Ludisia). This wild orchid is well known for its striking foliage and its medicinal benefits. Since the population of this valuable species is becoming scarce, therefore protecting this orchid is crucial. Cryopreservation is a practicable long-term germplasm conservation approach. The genetic material is stored at freezing temperature using liquid nitrogen. In this study, V cryo-plate method was developed using L. discolor axillary buds using optimum conditions. For the screening of somaclonal variation, 3 weeks old treated (cryopreserved and non-cryopreserved) explants were utilized in comparison with the stock cultures as a control. The genetic stability was assessed using a total of twenty (20) DAMD, twenty (20) ISSR, and ten (10) SCoT molecular markers. The somaclonal variation detected in cryopreserved explant using DAMD, ISSR, and SCoT molecular markers were 12.5, 4.17, and 10.53% respectively. However, somaclonal variation was also detected in non-cryopreserved explants using DAMD, ISSR, and SCoT at 6.15, 5.77, and 10%, respectively. Hence, SCoT was chosen to be precise than the other two molecular markers (DAMD and ISSR).</p> 2022-06-15T00:00:00+08:00 Copyright (c) 2022 Malaysian Journal of Science http://mjs.um.edu.my/index.php/MJS/article/view/28583 FREQUENTIST AND BAYESIAN ZERO-INFLATED REGRESSION MODELS ON INSURANCE CLAIM FREQUENCY: A COMPARISON STUDY USING MALAYSIA’S MOTOR INSURANCE DATA 2021-09-07T22:59:41+08:00 Razik Ridzuan Mohd Tajuddin razikridzuan@siswa.ukm.edu.my Noriszura Ismail ni@ukm.edu.my <p>A no-claim event is a common scenario in insurance and the abundance of no-claim events can be described adequately by zero-inflated models. The zero-inflated Poisson (ZIP) and zero-inflated negative binomial (ZINB) regression models from frequentist and Bayesian approaches are considered for fitting to Malaysia’s motor insurance data. The results from the fittings are compared using mean absolute deviation and mean squared prediction error. The data is categorized into three claim types and the factors considered for regression modelling are coverage type, vehicle age, vehicle cubic capacity and vehicle make. The results from the fittings showed that the ZIP model from both approaches provide better fit than the ZINB model. Also, both ZIP and ZINB models from the Bayesian approach provide better fitting than the frequentist models. Therefore, Bayesian ZIP is the best model in explaining motor insurance claim frequency in Malaysia for all three claim types. From the best regression models, vehicle age, coverage type and vehicle make are the most influential factors in determining the frequency of claim for each claim type. Vehicle age and coverage type have positive effect on the frequency of claim whereas the vehicle make has negative effect on the frequency of claim.</p> 2022-06-15T00:00:00+08:00 Copyright (c) 2022 Malaysian Journal of Science http://mjs.um.edu.my/index.php/MJS/article/view/31260 STUDY THE RELATIONSHIP BETWEEN BREMSSTRAHLUNG DOSE RATE AND THE ENERGY OF BETA RAY FOR DIFFERENT TYPES OF SHIELD 2021-10-01T10:22:29+08:00 Ahmed Mkhaiber ahmad.f@ihcoedu.uobaghdad.edu.iq Naz Jarallah naz.t.ja@ihcoedu.uobaghdad.edu.iq <p>The dose rate for bremsstrahlung radiation from beta particles with energy (1.710) MeV and (2.28) MeV which comes from (<sup>32</sup>P and <sup>90</sup>Y) beta source respectively have been calculated through six materials (polyethylene, wood, aluminum, iron, tungsten and lead) for first shielding material with thickness (x=1) mm which are putting between beta sources and second shield (polyethylene, aluminum and lead) with thickness (1, 2 &amp;4) mm have been calculated. The distance between beta source and second shield is constant (D=1) cm.</p> <p>&nbsp;&nbsp;&nbsp; This dose rate was found by program called Rad Pro Calculator (version 3.26). The results of dose rate of beta particles were plotted as a function to the atomic number (Z) for first shield materials for each type and each thickness of second shield and each beta energy.</p> <p>&nbsp;&nbsp;&nbsp; The results of bremsstrahlung dose rate show clearly that this value increased with increased beta particle energy and the atomic number for second shield material. While bremsstrahlung dose rate reduced with rise of the width of second shield.&nbsp;&nbsp;</p> 2022-06-15T00:00:00+08:00 Copyright (c) 2022 Malaysian Journal of Science http://mjs.um.edu.my/index.php/MJS/article/view/34683 EFFECT TWO ZERO DISPERSION WAVELENGTHS AND RAMAN SCATTERING IN THE THIRD-ORDER SOLITON OF SOLID CORE PHOTONIC CRYSTAL FIBERS TO PRODUCE SUPERCONTINUUM GENERATION 2022-01-13T12:23:12+08:00 Mohammed Altaie msjadr72@gmail.com <p><strong>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </strong>&nbsp; Photonic crystal fibers (<em>PCFs</em>)&nbsp; which consist of dielectric materials are a don't ever and an ever field in more modern application. The <em>Split-Step Fourier method (SSFM)</em> was used in this work to create a fiber photonic crystal, which was suggested and validated using a <em>Matlab software</em> .The impact of two -zero-&nbsp;dispersion on the Soliton in solid core photonic crystal fibers&nbsp;has been studied by investigating the interplay between <em>Raman effect</em> and second- order- dispersion. It has been discovered that the proposed photonic crystal fibers two –zero- dispersion wavelengths (<em>TZDW</em>) can be used to effectively tailor the properties of third order soliton. Many current&nbsp; applications, including medical and industrial, rely on spectral expansion. In addition,&nbsp; soliton has an important&nbsp; role in modern communication systems.</p> 2022-06-15T00:00:00+08:00 Copyright (c) 2022 Malaysian Journal of Science http://mjs.um.edu.my/index.php/MJS/article/view/31330 INVESTIGATING THE GROUND ENERGY DISTRIBUTION OF PARTICLES PRODUCED IN EXTENSIVE AIR SHOWERS 2021-12-01T14:28:23+08:00 Itab Wajid itabfadhil@uomustansiriyah.edu.iq Ahmed Al-Rubaiee dr.rubaiee@uomustansiriyah.edu.iq <p>The energy spectra of particle arrive the ground is a significant observable in the analysis of extensive air showers (EAS). The energy distribution at ground is studied for (<sup>12</sup>C,<sup>56</sup>Fe, p, and <sup>28</sup>Si ) primary particles with high primary energies (10<sup>17</sup>, 10<sup>18</sup>, 10<sup>19</sup> and 10<sup>20</sup>) eV with two zenith angles 0<sup>o </sup>and 30<sup>o</sup>.&nbsp; 960 EAS showers are simulated using Monte-Carlo program Aires version (19.04.00) with the models of hadronic interaction (EPOS-LHC, QGSJET-II-04, and Sibyll2.3c). In this study we investigated various secondary particles that arrive the ground and deposit a portion of their energy on ground detectors. The analyzed results show that the distinction in the energy distribution at ground is bigger for primary proton than carbon, iron nuclei, and silicon at higher energies and vertical showers.</p> 2022-06-15T00:00:00+08:00 Copyright (c) 2022 Malaysian Journal of Science http://mjs.um.edu.my/index.php/MJS/article/view/31794 INVESTIGATION OF FAST NEURON ATTENUATION COEFFICIENTS FOR SOME IRAQI BUILDING MATERIALS 2021-12-22T12:01:16+08:00 Ahmed Mkhaiber ahmad.f@ihcoedu.uobaghdad.edu.iq Auday Al-Bayati uday.t.s@ihcoedu.uobaghdad.edu.iq Itab Fadhil itabfadhil@uomustansiriyah.edu.iq <p>This research aims to improve the radiation shielding properties of polymer-based materials by mixing PVC with locally available building materials. Specifically, two key parameters of fast neutron attenuation (removal cross-section and half-value layer) were studied for composite materials comprising PVC reinforced with common building materials (cement, sand, gypsum and marble) in different proportions (10%, 30% and 50% by weight). To assess their effectiveness as protection against fast neutrons, the macroscopic neutron cross-section was calculated for each composite. Results show that neutron cross-section values are significantly affected by the reinforcement ratios, and that the composite material PVC + 50% gypsum is an effective shield against fast neutrons.</p> 2022-06-15T00:00:00+08:00 Copyright (c) 2022 Malaysian Journal of Science http://mjs.um.edu.my/index.php/MJS/article/view/28282 MICROFACIES OF LATE PLEISTOCENE TRAVERTINE DEPOSITS IN JORDAN 2021-07-21T15:55:47+08:00 Issa Mohammad Makhlouf makhlouf@hu.edu.jo Khalil M Ibrahim ibrahim@hu.edu.jo Ali R El Naqah elnaqa@hu.edu.jo Sana’ M. Al-Thawabteh sana.thawabteh@gmale.com <p>The Late Pleistocene travertine outcrops from Deir Alla, Suwayma, and Az Zara were investigated, and their microfacies were identified. The microfacies of the Deir Alla travertines include micrite and spar groundmass, shrubs, crystalline crusts, a stromatolite-like structure, peloids, and cements. Shrub travertine includes spar calcite-coated stems with probably microbial micritic clumps. The crystalline crust travertine displays an alternation of micrite and sparite laminae. The micritic laminae are dark-coloured. Bundles of radial spar crystals are associated locally with micritic groundmass. The crystalline crust developed where biogenic activity is limited. Peloidal microfacies are less than 0.25 mm in diameter, cryptocrystalline, pale-dark green in colour, elliptical to spherical in shape, and usually associated with microorganisms. The microfacies of the Suwayma and Az Zara travertines include crystalline calcite rhombs and other composite scalenohedral crystals. They occur as small anhedral-subhedral crystals, monocrystalline to some polycrystalline, corroded, subrounded, and mainly coated with iron oxide and/or clay minerals. Peloids, ooids, and oncoids are common. They are dark-green coloured, cryptocrystalline to microcrystalline carbonates of spherical and ellipsoidal shape with less than 1 mm in diameter. Rich flora travertines include reed and paper-thin rafts with leaf impressions encrusted on moss cushions. The flora observed in the upper part of the Suwayma section was identified as charophyte oospores (gyrogonites)<em>. </em>A few grains of quartz are present as small subhedral-euhedral crystals, monocrystalline, corroded, rounded, and mainly coated with iron oxide. The iron is irregularly distributed among the laminae and voids and is occasionally replaced by carbonates. The described macrophyte encrustation structures probably represent algae, cyanobacteria, or bryophytes. All samples of micrite and spar calcite appear as groundmass.</p> 2022-06-15T00:00:00+08:00 Copyright (c) 2022 Malaysian Journal of Science