THE 2018 UKM FST POSTGRADUATE COLLOQUIUM: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2018 Postgraduate Colloquium最新文献

{"title":"Physicochemical changes of tuna fish (Euthynnus affinis) throughout refrigerated storage condition. A preliminary study","authors":"F. Fazial, T. Ling, A. Ahmad, S. I. Zubairi","doi":"10.1063/1.5111250","DOIUrl":"https://doi.org/10.1063/1.5111250","url":null,"abstract":"Deterioration of fresh fish is indicated by its physical and chemical changes. The gills colour changes and level of total volatile base nitrogen (TVBN) and trimethylamine (TMA) formed in fresh tuna fish (Euthynnus affinis) stored in refrigerated condition were investigated as indices of spoilage. Food Drug Administration (FDA) recommended to store fishes up to two days under refrigerated (4 °C) temperature. However, there is an issue in hypermarket where the storage length could exceed for several days and possibly for the spoilage fish to mix with the fresh fish. Gills colour examination using colour meter (physical test) and determination of TVBN and TMA using kjedahl steam distillation (chemical test) were conducted throughout seven days of storage. The a* value decreased significantly with storage time from 18.34 to 10.40 (p<0.05) indicated loss of redness colour. TVBN and TMA increased significantly along the storage period from 17.36 mg N/ 100g to 26.88 mg N/ 100g for TVBN and from 2.63 mg N/ 100g to 18.87 mg N/ 100g for TMA respectively. The finding is useful in monitoring the fish safety limit for consumers.Deterioration of fresh fish is indicated by its physical and chemical changes. The gills colour changes and level of total volatile base nitrogen (TVBN) and trimethylamine (TMA) formed in fresh tuna fish (Euthynnus affinis) stored in refrigerated condition were investigated as indices of spoilage. Food Drug Administration (FDA) recommended to store fishes up to two days under refrigerated (4 °C) temperature. However, there is an issue in hypermarket where the storage length could exceed for several days and possibly for the spoilage fish to mix with the fresh fish. Gills colour examination using colour meter (physical test) and determination of TVBN and TMA using kjedahl steam distillation (chemical test) were conducted throughout seven days of storage. The a* value decreased significantly with storage time from 18.34 to 10.40 (p<0.05) indicated loss of redness colour. TVBN and TMA increased significantly along the storage period from 17.36 mg N/ 100g to 26.88 mg N/ 100g for TVBN and from 2.63 mg N/ 100g ...","PeriodicalId":247449,"journal":{"name":"THE 2018 UKM FST POSTGRADUATE COLLOQUIUM: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2018 Postgraduate Colloquium","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125256611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Coefficient estimates for a subclass of analytic bi-univalent involving faber polynomial and fox-wright function","authors":"M. Pauzi, M. Darus, S. Siregar","doi":"10.1063/1.5111217","DOIUrl":"https://doi.org/10.1063/1.5111217","url":null,"abstract":"","PeriodicalId":247449,"journal":{"name":"THE 2018 UKM FST POSTGRADUATE COLLOQUIUM: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2018 Postgraduate Colloquium","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115149926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Confinement and characterization of deep eutectic solvent based on choline chloride:alcohol into nanoporous silica for CO2 capture","authors":"Zaitun Ghazali, M. Yarmo, R. Othaman","doi":"10.1063/1.5111262","DOIUrl":"https://doi.org/10.1063/1.5111262","url":null,"abstract":"Biodegradable nanocomposite adsorbents based on nanoporous silica (NS) and deep eutectic solvents (DESs) mixture of choline chloride:glycerol (ChCl:Gly) and choline chloride:ethylene glycol (ChCl:EG) were synthesized and the ability to adsorb carbon dioxide (CO2) has been studied. All DESs were prepared in mole ratio 1:2 and 10 w/w% were confined into nanoporous silica through sol gel method. The physicochemical properties of the prepared adsorbents have been characterized using Fourier transform infrared attenuated total reflectance (FTIR-ATR) and surface analyzer ASAP 2020. The presence of ChCl:Gly and ChCl:EG in the NS can be detected with the presence sp3 hybridized CH stretching and CH2 bending peaks. Specific surface areas of the NS were significantly reduced with confinement of DESs due to the transformation of micropores to mesopores. The ability of adsorbent to adsorb CO2 was evaluated using isothermal CO2 adsorption by Micromeritic ASAP 2020. ChCl:Gly/NS showed higher CO2 adsorption capacity compared to ChCl:EG/NS which are 20.1 mgCO2/gadsorbent and 18.8 mgCO2/gadsorbent, respectively.","PeriodicalId":247449,"journal":{"name":"THE 2018 UKM FST POSTGRADUATE COLLOQUIUM: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2018 Postgraduate Colloquium","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131990547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quasi-centroids of four dimensional Leibniz algebras","authors":"H. Almutari, A. Ahmad","doi":"10.1063/1.5111215","DOIUrl":"https://doi.org/10.1063/1.5111215","url":null,"abstract":"In this work, we introduce the concept of centroid quasi-centroid for Leibniz algebras and study some of their properties. Then, we determine the quasi-centroid of four-dimensional Leibniz algebras and give their classification.In this work, we introduce the concept of centroid quasi-centroid for Leibniz algebras and study some of their properties. Then, we determine the quasi-centroid of four-dimensional Leibniz algebras and give their classification.","PeriodicalId":247449,"journal":{"name":"THE 2018 UKM FST POSTGRADUATE COLLOQUIUM: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2018 Postgraduate Colloquium","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132134591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Studies on electrochemical behaviour of PVdF-HFP based ionic liquid gel polymer electrolyte","authors":"Mariah Zuliana Dzulkipli, A. Ahmad, M. S. Su’ait, S. Noor, N. A. Dzulkurnain, J. Karim, N. H. Hassan","doi":"10.1063/1.5111254","DOIUrl":"https://doi.org/10.1063/1.5111254","url":null,"abstract":"Ionic liquid gel polymer electrolyte (ILGPE) film consisting of poly(vinylidene fluoride-hexafluoropropylene) (PVdF-HFP) and 1-butyl-3-methylimidazolium tetrafluoroborate [Bmim][BF4] with different composition ratio were prepared through solution casting technique. The prepared films were subjected to impedance, temperature dependence, and total ionic transference number analysis. Ionic conductivity for each ILGPEs were measured at room temperature and with increasing temperature ranging from 303 to 373 K. The maximum room temperature ionic conductivity is found to be 2.84 × 10-3 S cm-1 for film containing 60% composition ratio of [Bmim][BF4]. Temperature dependence analysis showed that the ionic conductivity of the ILGPEs increased with increasing temperature and seem to obey Arrhenius behaviour. Total ionic transference number showed that ions are the major charge carriers in this system.Ionic liquid gel polymer electrolyte (ILGPE) film consisting of poly(vinylidene fluoride-hexafluoropropylene) (PVdF-HFP) and 1-butyl-3-methylimidazolium tetrafluoroborate [Bmim][BF4] with different composition ratio were prepared through solution casting technique. The prepared films were subjected to impedance, temperature dependence, and total ionic transference number analysis. Ionic conductivity for each ILGPEs were measured at room temperature and with increasing temperature ranging from 303 to 373 K. The maximum room temperature ionic conductivity is found to be 2.84 × 10-3 S cm-1 for film containing 60% composition ratio of [Bmim][BF4]. Temperature dependence analysis showed that the ionic conductivity of the ILGPEs increased with increasing temperature and seem to obey Arrhenius behaviour. Total ionic transference number showed that ions are the major charge carriers in this system.","PeriodicalId":247449,"journal":{"name":"THE 2018 UKM FST POSTGRADUATE COLLOQUIUM: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2018 Postgraduate Colloquium","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122542253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Statistical study of equatorial geomagnetic crochets","authors":"N. M. Annadurai, N. S. A. Hamid, A. Yoshikawa","doi":"10.1063/1.5111233","DOIUrl":"https://doi.org/10.1063/1.5111233","url":null,"abstract":"This study present the statistical investigation of equatorial geomagnetic crochets due to strong solar flare of class M to X. Our analysis utilized data from eight magnetometer stations provided by MAGnetic Data Acquisition System network (MAGDAS) at different longitudes sector during period from January 2008 to March 2015. We have considered 52 cases of solar flare events. Based on our analysis, 65% of the studied solar flares show no effect on geomagnetic variation with most of it from class M8, M9 and X1. The absence of solar flare effect might due to the influence of coronal mass ejection (CME) on the observation data or due to the station’s location is at nighttime. The other 35% shows geomagnetic crochets to the magnetic data variation where majority are mix effect dominated by positive crochets. Apart from that, we also found an interesting solar flare effect where negative geomagnetic crochets were detected from all equatorial magnetometer data. The unique effect is due to X-class solar flare on 9th August 2011. Further investigation using extended latitudinal and longitudinal magnetometer is recommended to observe the whole picture of the solar flare effect to global ionospheric current.This study present the statistical investigation of equatorial geomagnetic crochets due to strong solar flare of class M to X. Our analysis utilized data from eight magnetometer stations provided by MAGnetic Data Acquisition System network (MAGDAS) at different longitudes sector during period from January 2008 to March 2015. We have considered 52 cases of solar flare events. Based on our analysis, 65% of the studied solar flares show no effect on geomagnetic variation with most of it from class M8, M9 and X1. The absence of solar flare effect might due to the influence of coronal mass ejection (CME) on the observation data or due to the station’s location is at nighttime. The other 35% shows geomagnetic crochets to the magnetic data variation where majority are mix effect dominated by positive crochets. Apart from that, we also found an interesting solar flare effect where negative geomagnetic crochets were detected from all equatorial magnetometer data. The unique effect is due to X-class solar flare on ...","PeriodicalId":247449,"journal":{"name":"THE 2018 UKM FST POSTGRADUATE COLLOQUIUM: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2018 Postgraduate Colloquium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130426796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of cellulose fiber loading on the properties of starch-based films","authors":"N. Yacob, M. Yusof, A. Mohamed, K. Badri","doi":"10.1063/1.5111257","DOIUrl":"https://doi.org/10.1063/1.5111257","url":null,"abstract":"Sago starch is a seasonal based plantation and widely found in Asia country. Its application mainly in cooking such as biscuits and as a thickener in jellies. To further utilize its application, bioplastic from sago starch was developed. Due to its highly hydrophilic characteristic and poor mechanical properties, the addition of cellulose fibers extracted from sago waste was studied and presented in this paper. The films were prepared by solution casting and their characterizations were carried out in term of tensile properties, X-ray diffractograms, thermogravimetric analysis, wettability and water absorption behavior. The incorporation of cellulose fibers has successfully increased the properties of the sago starch films. The tensile strength and Young’s modulus increased significantly with the increase of cellulose fibers content while the elongation decreased. Thermal stability improved with the introduction of cellulose fibers. XRD patterns confirm the presence of cellulose fibers in sago starch film.Sago starch is a seasonal based plantation and widely found in Asia country. Its application mainly in cooking such as biscuits and as a thickener in jellies. To further utilize its application, bioplastic from sago starch was developed. Due to its highly hydrophilic characteristic and poor mechanical properties, the addition of cellulose fibers extracted from sago waste was studied and presented in this paper. The films were prepared by solution casting and their characterizations were carried out in term of tensile properties, X-ray diffractograms, thermogravimetric analysis, wettability and water absorption behavior. The incorporation of cellulose fibers has successfully increased the properties of the sago starch films. The tensile strength and Young’s modulus increased significantly with the increase of cellulose fibers content while the elongation decreased. Thermal stability improved with the introduction of cellulose fibers. XRD patterns confirm the presence of cellulose fibers in sago starch film.","PeriodicalId":247449,"journal":{"name":"THE 2018 UKM FST POSTGRADUATE COLLOQUIUM: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2018 Postgraduate Colloquium","volume":"02 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131173535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Statistical comparison of projection Malaysia mortality rate by using Lee-Carter model and Lee-Carter extension of Hyndman-Ullah","authors":"Halim Shukri Kamaruddin, N. Ismail","doi":"10.1063/1.5111214","DOIUrl":"https://doi.org/10.1063/1.5111214","url":null,"abstract":"Study of human mortality pattern is a significant area for any nation to maintain a good social-economy in the next projection decades. The declining in mortality trend gives a good impression of what the nation has done towards macro citizen in one nation. Selection of mortality tool can be complex based on the method and analysis approach adapted. Lee-Carter model is adapted because of its simplicity and reliability of the outcome results. Implementation of Lee-Carter in finding a fitting model and hence its projection has been used worldwide in most of mortality research in developed countries. This paper studies the mortality pattern of Malaysia using original model of Lee-Carter and its extension of Hyndman-Ullah. The data is indexed by age of death and year of death from 1984 to 2012, in which are supplied by Department of Statistics Malaysia. The modeling results are modeled using Rstudio and the keen analysis can be focus on Malaysia’s social-economics and insurance related aspect. This paper can be extended to another variety of Lee-Carter extensions and any stochastic mortality tools by using same mortality data.Study of human mortality pattern is a significant area for any nation to maintain a good social-economy in the next projection decades. The declining in mortality trend gives a good impression of what the nation has done towards macro citizen in one nation. Selection of mortality tool can be complex based on the method and analysis approach adapted. Lee-Carter model is adapted because of its simplicity and reliability of the outcome results. Implementation of Lee-Carter in finding a fitting model and hence its projection has been used worldwide in most of mortality research in developed countries. This paper studies the mortality pattern of Malaysia using original model of Lee-Carter and its extension of Hyndman-Ullah. The data is indexed by age of death and year of death from 1984 to 2012, in which are supplied by Department of Statistics Malaysia. The modeling results are modeled using Rstudio and the keen analysis can be focus on Malaysia’s social-economics and insurance related aspect. This paper can ...","PeriodicalId":247449,"journal":{"name":"THE 2018 UKM FST POSTGRADUATE COLLOQUIUM: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2018 Postgraduate Colloquium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131341006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Isolation and identification of lactic acid bacteria from local pickled mango with antibacterial potential","authors":"N. Mohamad, M. A. Manan, N. A. Sani","doi":"10.1063/1.5111259","DOIUrl":"https://doi.org/10.1063/1.5111259","url":null,"abstract":"","PeriodicalId":247449,"journal":{"name":"THE 2018 UKM FST POSTGRADUATE COLLOQUIUM: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2018 Postgraduate Colloquium","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128361498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Potential of calcium silicate as a coating material on maghemite(γ-Fe2O3) for hyperthermia treatment","authors":"Nor Hazirah Mohd Akhirudin, R. Shamsudin, Hamisah Ismail","doi":"10.1063/1.5111238","DOIUrl":"https://doi.org/10.1063/1.5111238","url":null,"abstract":"Through previous research, the excellent biocompatibility and bioactivity of calcium silicate were proven with the wide use in biomedical application. In this work, calcium silicate was synthesized from tetraethylorthosilicate (TEOS) and calcium nitrate tetrahydrate with calcium oxide: silicon dioxide (CaO: SiO2) ratio of 30:70 using sol-gel method. Chemical composition of CaO and SiO2 were analyzed using X-ray diffraction (XRD) and X-ray fluorescent (XRF). Magnetic Nanoparticles (MNPs) are gaining interest in all biomedical related application. However the usage of MNPs can’t be used directly and needed coating layer to improve the dispersion stability, biocompatibility and provide functionality. MNPs materials used in this research are maghemite (γ-Fe2O3). Maghemite was synthesized from ferrous chloride (FeCl3) and ferric chloride (FeCl2) with ratio FeCl3 to FeCl2 2:1 using sol gel method. Through this research, the potential of new coating materials which is calcium silicate to coat on maghemite while maintained the magnetic properties were studied and analyzed using VSM, XRD and XRF.Through previous research, the excellent biocompatibility and bioactivity of calcium silicate were proven with the wide use in biomedical application. In this work, calcium silicate was synthesized from tetraethylorthosilicate (TEOS) and calcium nitrate tetrahydrate with calcium oxide: silicon dioxide (CaO: SiO2) ratio of 30:70 using sol-gel method. Chemical composition of CaO and SiO2 were analyzed using X-ray diffraction (XRD) and X-ray fluorescent (XRF). Magnetic Nanoparticles (MNPs) are gaining interest in all biomedical related application. However the usage of MNPs can’t be used directly and needed coating layer to improve the dispersion stability, biocompatibility and provide functionality. MNPs materials used in this research are maghemite (γ-Fe2O3). Maghemite was synthesized from ferrous chloride (FeCl3) and ferric chloride (FeCl2) with ratio FeCl3 to FeCl2 2:1 using sol gel method. Through this research, the potential of new coating materials which is calcium silicate to coat on maghemite while ...","PeriodicalId":247449,"journal":{"name":"THE 2018 UKM FST POSTGRADUATE COLLOQUIUM: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2018 Postgraduate Colloquium","volume":"49 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114009960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}