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Conductivity enhancement by controlled percolation of inorganic salt in multiphase hexanoyl chitosan/polystyrene polymer blends

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Frontiers of Materials Science 2015年第2期9卷 132-140页

作者： Tan WlNIE Nur Syuhada mohd shahril Faculty of Applied Sciences Universiti Teknologi MARA 40450 Shah Alam Malaysia

Hexanoyl chitosan and polystyrene blends are immiscible by the elucidation of the glass transition temperature （Tg） as well as the viscometric and morphological analyses. Selective localization of the lithium salt in hexanoyl chitosan phase as the percolation pathway enhanced the conductivity in the blends as compared to the neat hexanoyl chitosan. The ionic conductivity of a polymer electrolyte is described by σ = enp. Thus, estimation of charge carrier density （n） and mobility （μ） is important in order to assess the performance. In this work, these parameters are calculated using impedance spectroscopy and FTIR.

关键词： hexanoyl chitosan polystyrene polymer electrolyte conductivity perco-lation pathway

Strength Performance and Microstructure Characteristic of Naturally-Bonded Fiberboard Composite from Malaysian Bamboo(Bambusa vulgaris)

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Journal of Renewable Materials 2022年第10期10卷 2581-2591页

作者： shahril Anuar Bahari mohd Nazarudin Zakaria Syaiful Osman Falah Abu Mohamad Jani Saad Reza Hosseinpourpia Eco-Technology Program Faculty of Applied SciencesUniversiti Teknologi MARA(UiTM)Shah Alam40450Malaysia Engineering Research Centre Malaysian Agricultural Research and Development Institute(MARDI)Serdang43400Malaysia Department of Forestry and Wood Technology Linnaeus UniversityVäxjö35195Sweden

This study investigated the mechanical properties and microstructural characteristics of fiberboard composite produced by naturally-bonded Malaysian bamboo fiber(Bambusa vulgaris).The components that obtained through soda pulping of bamboo culms such as fiber and black liquor,were used for the preparation of high-density fibreboard composite at two target densities of 850 and 950 kg/m^(3).The bamboo fiberboard composite(BFC)were then produced at 200°C and two pressing parameters of 125 and 175 s/*** mechanical properties,e.g.,flexural strength and internal bonding(IB)of BFC samples were evaluated according to BS EN 310:1993 and BS EN 319:1993,*** was found that the mechanical performance of the composite with 850 kg/m^(3)density was significantly higher than 950 kg/m^(3)ones,especially for the samples with 125 s/mm pressing *** characteristic of the BFC samples illustrated that the fiber linkages were cracked in the composites with higher density,e.g.,the composite with the density of 950 kg/m^(3)and also black liquor were slightly degraded at longer pressing time,which led to the reduction in mechanical properties,especially in IB strength.

关键词： Bamboo fiber naturally-bonded black liquor mechanical properties SEM composite

Recovery of bird communities following the construction of a large-scale hydroelectric dam

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Ecological Processes 2021年第1期10卷 408-417页

作者： Affan Nasruddin-Roshidi Mohammad Saiful Mansor Nor Adibah Ismail Ehwan Ngadi mohd Izzat-Husna shahril Mod Husin Farah Shafawati mohd-Taib Rahmah Illias Shukor Md Nor Department of Biological Sciences and Biotechnology Faculty of Science and TechnologyUniversiti Kebangsaan Malaysia43600 BangiSelangorMalaysia Kolej GENIUS Insan Universiti Sains Islam MalaysiaBandar Baru Nilai71800 NilaiNegeri SembilanMalaysia TNB Research Sdn Bhd No.1Kawasan Institusi PenyelidikanJalan Ayer Itam43000 KajangSelangorMalaysia Department of Wildlife and National Parks(PERHILITAN) Km.10Jln Cheras56100 Kuala LumpurWilayah PersekutuanMalaysia.

Background:Habitat degradation is known to have a major impact on the composition of bird communities,yet how these communities recover following such disturbance is less *** study examined bird community changes from pre-logging to recovery over the course of habitat disturbance caused by the development of the Hulu Terengganu Hydroelectric Dam Project in Peninsular Malaysia,between 2007 and *** surveys were conducted using point count observations and mist netting in the dam area from the prelogging phase until the operation ***:It was observed that while bird species significantly declined after large-scale habitat clearance between the pre-logging and construction phases,they showed positive signs of recovery from the inundation to operation *** findings indicate that the bird community is still recovering,and the permanent loss of habitat required by most of the original species has not occurred,as evidenced by *** species composition differed across phases due to varying habitat *** turnover rate and immigration rate(recolonisation and newly recorded species)were higher between the construction and operation *** was also observed that insectivorous birds were more heavily affected than others by changes to the landscape,which highlights the versatility,survivability and tolerance of certain species to extreme disturbance and habitat ***:Although the operation phase showed an incremental change in bird species richness due to recolonisation and newly recorded species,this value remains far from that of the pre-logging *** predict that bird species recovery will continue to increase for some time before reaching a plateau among the newly created islands,reservoir and catchment area of the dam.

关键词： Dam construction Extinction Habitat recovery Recolonisation Turnover

Approximate Analytical Solution to Temperature Profile in a Solid Composite Heated by a Pulsed Laser

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Engineering（科研） 2013年第5期5卷 505-510页

作者： Sani Jibrin mohd Maarof Moksin mohd shahril Husin Mohammed Yusuf Waziri Azmi Bin Zakaria Zainal Abidin Bin Talib Department of Mathematics Faculty of Science Universiti Putra Malaysia Serdang Malaysia Department of Physics Faculty of Science Universiti Putra Malaysia Serdang Malaysia

The flash technique of thermal diffusivity measurement applied to composite materials is dependent upon the success at deriving and solving the associated heat diffusion equation for the particular boundary problems of the experiment. Orthogonal expansion technique and the Green’s function approach are easier and straight forward for deriving and solving such equations, but the solutions converge very slowly for small times and hence cannot be used for numerical calculations. The Laplace transformation technique on the other hand has advantage of allowing for the making of small time approximation in order to obtain solutions that are very rapidly convergent. The principle difficulty of this technique is in the inversion of the resulting transform from s to t domain. Inversion by contour integration requires a lot of mastery in integral calculus and the simplest method is therefore to look up for the transform in the standard Laplace conversion table. At first look not all subsidiary equations can be converted using the Laplace transform conversion table;in this work however, we present the mathematical analysis by means of which analytical solutions to heat diffusion problem in composite media;hitherto only transformed via contour integration, is obtained directly from the Laplace transform conversion tables.

关键词： Laplace Transforms Subsidiary Equations Laplace Inversion Theorem Laser Pulse

Discovery of Simple Sequence Repeat Markers through Transcriptome Analysis of Baccaurea motleyana

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Journal of Food Science and Engineering 2020年第2期10卷 33-46页

作者： Khairun Hisam Nasir Muhammad Fairuz mohd Yusof mohd shahril Firdaus Abdul Razak Siti NorsaidahIbrahim Mira Farzana Mohamad Moktar Khadijah Awang mohd Shukri Mat Ali Centre for Molecular Marker Discovery and Validation(CMDV) Agri-Omic dan BioinformaticsBiotechnology and Nanotechnology Research CentreMalaysian Agricultural Research and Development Institute(MARDI)Serdang 43400SelangorMalaysia Industrial Crop Research Centre Malaysian Agricultural Research and Development Institute(MARDI)Serdang 43400SelangorMalaysia Horticulture Research Centre Malaysian Agricultural Research and Development Institute(MARDI)Serdang 43400SelangorMalaysia

Baccaurea motleyana(rambai)is underutilized fruits that are native to Malaysia,Indonesia and *** this study,a total of 54,779 unigenes identified from rambai transcriptome were used for simple sequence repeat(SSR)analysis by MIcroSAtellite(MISA).A total of 20,420 SSRs were found to be distributed within 37.27%of the total number of *** repeats represented the main type,accounting for 64.04%,followed by trinucleotide repeats(20.28%)and dinucleotide repeats(19.94%).Gene annotation to seven databases has a success ratio of 68.53%(National Center for Biotechnology Information(NCBI)protein sequences),53.68%(NCBI nucleotide sequences),27.43%(Kyoto Encyclopedia of Genes and Genome Ortholog),56.0%(SwissProt),52.44%(Protein family),53.99%(Gene Ontology)and 26.44%(Kluster of Orthologous Group).Further rambai SSRs were randomly selected and validated to ***(rambai),***(tampoi),***(jentik-jentik),***(pupor)and ***(setambun).

关键词： Baccaurea SSR transcriptome gene annotation and SSR validation

Development of Starfruit Simple Sequence Repeat (SSR) Using Next Generation Sequencing

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Journal of Food Science and Engineering 2019年第3期9卷 95-121页

作者： Khairun Hisam Nasir Muhammad Fairuz mohd Yusof mohd shahril Firdaus Siti Zainab Jantan Mira Farzana Mohamad Moktar Siti Norsaidah Ibrahim Noor Baiti Abdul Aziz Joanna Cho Lee Ying Centre for Molecular Marker Discovery and Validation (CMDV) Agri-Omic dan Bioinformatics Biotechnology and Nanotechnology Research Centre Malaysian Agricultural Research and Development Institute (MARDI) 43400 Serdang Selangor Malaysia Horticulture Research Centre Headquarters Malaysian Agricultural Research and Development Institute (MARDI) 43400 Serdang Selangor Malaysia

Starfruit (Averrhoa carambola L.) is an important fruit for Malaysian export and great attention has been made to improve starfruit fruit quality at Malaysian Agricultural Research and Development Institute (MARDI). The current study used next generation sequencing (NGS) technologies to develop starfruit simple sequence repeat (SSR) from 2 varieties namely B11 and B17 using Illumina HiSeq. The pre-processed reads were de novo assembled to generate approximately 75,000 and 74,000 scaffolds respectively. Total genome size for B11 and B17 were around 345 Mbp and 342 Mbp based on K-mer distribution analysis. In-silico microsatellite mining of each variety has identified more than 17,000 SSR in B11 and B17 respectively. Dinucleotides were the most abundant, accounting for more than 70% of all SSR and repeat motif GA (49%) was most common. A total of 239 SSR primer pairs were designed from contigs larger than 350 nucleotides and tested for amplification. The 30 polymorphic SSRs were used to DNA fingerprint of 12 starfruit hybrids. Polymorphism information content (PIC) ranged from 0.1411 to 0.6838, with an average of 0.3919. The Unweighted Pair-Group Method for Arithmetic Averages (UPGMA) dendrogram clustered 12 starfruit accessions into 2 groups.

关键词： Starfruit (Averrhoa carambola L.) next generation sequencing molecular marker simple sequence repeat