Published by
Penerbit Universiti Sains Malaysia



Print ISSN: 1823-3430
Online ISSN: 2180-4214
Frequency: Annually
Current Issue: Volume 13, 2017
Abstracting/Indexing: MyJurnal, ProQuest, Google Scholar, Genamics JournalSeek, WorldCat


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Aims and Scope

The Journal of Engineering Science presents a broad interdisciplinary knowledge hub on novel international practices and the most recent research findings of practical importance in all aspects of engineering science that could be of benefit to any community worldwide. This international journal aims to be a catalyst towards the eventual success of the United Nations Decade of Education for Sustainable Development (UNDESD) programme. A hallmark of this journal papers is that they are interdisciplinary in nature, a distinction of findings involving collaboration between traditional engineering disciplines and other scientific fields of specialization. Transdiscipline scope of the Journal will focus on all aspects of engineering disciplines; which could include design, development of engineering techniques, engineering technology, government and legislative policies, engineering management, mathematical modelling of engineering processes, cost optimization, economic aspects of industry, impact of engineering practices on society, biotechnology, nanotechnology, medical image analysis, fuel cells, fibre optics, robotics, offshore foundations, optoelectronics, superconductivity, hypersonics, turbomachinery, coastal management, structural integrity, physiological modelling, ophthalmic technology, geophysics and environmental management via treatment and control of hazardous wastes among others. The objective of this Journal is to enhance communication and understanding across all aspects of global engineering science fraternity via the publications of peer-reviewed and original papers on engineering advancement and solutions to problems worldwide.


The Journal of Engineering Science herewith announces its decision to retract article Controllability of Hybrid Model Reference Fuzzy Logic Controller for Load Disturbances in Shell-and-Tube Heat Exchanger Temperature System which was scheduled for publication in Volume 10 (2014). The decision is made upon discovery that an article of similar contents have been published in another journal.

All manuscripts submitted for publication must be original, previously unpublished, and not under consideration for publication elsewhere. Its publication must be approved by all Authors and tacitly or explicitly by the responsible authorities where the work was carried out, and that, if accepted, it will not be published elsewhere in the same form, in English or in any other language, without the written consent of the publisher, Penerbit Universiti Sains Malaysia.


Publication Ethics

Journal of Engineering Science adheres to the Committee on Publication Ethics (COPE) standards on publications ethics. For further details please visit:


Current Issue


Volume 13, 2017
 

Title: Synthesis and Characterisation of Functionalised-Graphene Oxide by Gamma-Ray Irradiation
Author: Noraniza Ahmad Daud, Buong Woei Chieng, Nor Azowa Ibrahim and Zainal Abidin Talib
Source: Journal of Engineering Science 13: 1–17, 2016
 
- Abstract  

Gamma-ray irradiation technique was used to functionalise graphene oxide (GO) withvarious alkyl chain length alkylamine. Functionalisation of alkylchain onto the GO was confirmed by nuclear magnetic resonance (1H NMR), Fourier transform infrared (FTIR) and X-ray diffraction (XRD). FTIR of functionalised GO showed the appearance of significant peaks around 2850–2960 cm–1 (–CH2) which come from long alkylchain together with peak around 1450–1560 cm–1 indicating the formation of C–NH–C. XRD showed an additional diffraction peak at lower 2θ angle, indicating that the intercalation of alkylamine was successful. The effects of various alkyl lengths functionalised-GO on morphological and thermal properties were investigated. Scanning electron microscopy (SEM) analysis showed an increase in surface roughness when the alkyl chain length increases. The addition of alkylchain on GO surfaces significantly improves the thermal stability of GO, suggesting their great potential for hydrophobic material in industry.

Keywords: Graphene oxide, functionalisation, alkylamine, gamma-irradiation

Title: The Effect of Ethylene Dimethacrylate (EDMA) on Electrical Conductivity and Tensile Properties of Poly (Vinyl Chloride)/Poly (Ethylene Oxide)/Polyaniline (PAni) Conductive Films
Author: Mohammed Izzuddeen Mohd Yazid, Supri Abdul Ghani, Azlin Fazlina Osman and Siti Hajar Mohd Din
Source: Journal of Engineering Science 13: 19–28, 2016
 
- Abstract  

The effect of ethylene dimethacrylate (EDMA) as surface modifier and polyaniline (PAni) into poly (vinyl chloride) (PVC)/poly (ethylene oxide) (PEO) blends was studied. PVC/PEO conductive films with 2.5, 5, 7.5 and 10 wt % of PAni were prepared using solution casting technique. The addition of EDMA showed higher electrical properties, tensile strength and modulus of elasticity for all compositions of PVC/PEO conductive films. Scanning electron microscopy (SEM) results show that the addition of EDMA in conductive films gives good fillers dispersion in the PVC/PEO/PANI conductive films.

Keywords: Poly (vinyl chloride), poly (ethylene oxide), polyaniline, ethylene dimethacrylate, conductive films

Title: Manipulation of Fe/Au Peroxidase-Like Activity for Development of a Nanocatalytic-Based Assay
Author: Yazmin Bustami, Murray Moo-Young and William A. Anderson
Source: Journal of Engineering Science 13: 29–52, 2016
 
- Abstract  

Nanoparticles have been discovered to have intrinsic peroxidase-like catalytic activity that shows beneficial applications in a biosensor. The aim of this study is to investigate the synthesised Fe/Au nanoparticles' peroxidase-like activity and further evaluate them for development of a nanocatalytic-based assay specifically designed to detect 17β-estradiol in water. The peroxidase-like activity of the synthesised Fe/Au nanoparticles was optimised using the H2O2-ABTS system and was characterised using Michaelis-Menten kinetics. Then, the nanoparticles surface was functionalised with aptamers for specific conjugation with the target analyte, 17β-estradiol. The feasibility of this assay was tested at different concentration of aptamer-tagged Fe/Au nanoparticles and 17β-estradiol. Also, assessment of this assay was conducted with potentially interfering materials and spiked real tap water samples. Results obtained from absorbance data reveal that the Fe/Au-17β-estradiol complex significantly hampered the peroxidase-like catalytic activity of the nanoparticles. The absorbance intensity declined drastically after aptamer-tagged nanoparticles (Fe/Au-fl-apt) "captured" the targets and formed nanoparticles-analytes complexes. This assay showed good accuracy and reproducibility for detection of 17β-estradiol concentration ranging from 3 to 272 ng/L. Furthermore, the aptamers used in this study were very selective towards the target analyte and related compounds showed little to no interference. Thus, a simple, rapid and sensitive detection assay, specific for 17β-estradiol was developed using a new detection strategy by manipulation of nanoparticles' peroxidase-like activity.

Keywords: Fe/Au nanoparticles, peroxidase-like activity, nanocatalytic-based assay, detection of 17β-estradiol

Title: Evaluation of Weld Line Strength in Low Density Polyethylene Specimens by Optical Microscopy and Simulation
Author: Tan Yizong, Zulkifli Mohamad Ariff and Khoo Guo Liang
Source: Journal of Engineering Science 13: 53–62, 2016
 
- Abstract  

Investigation on the effect of different processing parameters onto injection moulded low density polyethylene (LDPE) had been done. The LDPE was moulded into dumbbell shape with weld line to better understand the flow front of the polymer melt and where two flow fronts meet. Three parameters were chosen to shear modify the LDPE, which were injection speed, injection pressure and mould temperature. Tensile testing was being done onto the dumbbell samples to evaluate the strength of the weld line produced. Differential Scanning Calorimetry was being done onto the weld line region to obtain the degree of crystallinity but was found to be not a good method for strength evaluation. Measurement of the thickness of the weld line under optical microscope showed that it was related to the tensile strength of the dumbbell samples with inverse relationship. Simulation of the polymer melt flow was also being done using CADMOULD to visualise the effect of the chosen processing parameters onto the polymer flow front and was found to be able to evaluate the weld line strength.

Keywords: Low density polyethylene, weld line, injection speed, injection pressure, mould temperature, CADMOULD

Title: The Fibre Damage Due to the Mechanical Cutting of Treated and Untreated Kenaf Short Fibre/Unsaturated Polyester Composite
Author: Ahmad Zafir Romli and Muhammad Mustakim Mohd Ghaztar
Source: Journal of Engineering Science 13: 63–74, 2016
 
- Abstract  

The use of short natural fibre in polymer matrix is common since it would be easier for the processing purposes. The common method used to shorten the fibre is via the pulverisation process. Pulverisation is a size reduction process by means of mechanical cutting using sharp rotating steel blades. However, less attention was given to the effects of this process towards the micro-structural properties of the natural fibre. This study is to trash out the most significant mechanical damage to the treated and untreated, pulverised Kenaf fibre using 0.25 and 5.0 mm sieve sizes. The micro-structural properties of the fibre were analysed using polarised optical microscope. From the results obtained, it was identified that there are seven types of fibre damage to the Kenaf fibre after passing through the pulverisation processes. These damages are the fibre axial splits, fibrillar failure, granular fracture, fatigue failure, fibre peel off, chemically degraded fibre brake and biaxial failure. By knowing the behaviour and fibre condition, the cause of inconsistency of natural fibre based composite strength can be further discussed.

Keywords: Kenaf short fibre, pulverisation process, unsaturated polyester, fibre damage, mechanical damage

Title: The Effect of Alkaline Peroxide Pre-Treatment on Properties of Peanut Shell Powder Filled Recycled Polypropylene Composites
Author: Nor Fasihah Zaaba, Mariatti Jaafar and Hanafi Ismail
Source: Journal of Engineering Science 13: 75–87, 2016
 
- Abstract  

This recent study investigates the properties of recycled polypropylene (RPP)/peanut shell powder (PSP) composites under the effect of alkaline peroxide pre-treatment. RPP/PSP composites were prepared by melt-mixing and compression molding with 0 to 40 wt % of PSP loading. The untreated RPP/PSP composites and treated RPP/PSP/H2O2 composites were compared and characterised by tensile properties, Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). The results showed that the treated PSP enhanced the tensile and thermal properties of RPP/PSP/H2O2 composites while the FTIR spectra and SEM morphology presented the elimination of lignin content strongly influenced the fractured surface and chemical characteristics of the RPP/PSP/H2O2 composites.

Keywords: Lignocellulosic, alkaline peroxide, peanut shell powder, recycled polypropylene, lignin removal

Title: Assessment of Stratified Saturated Subsoils for Foundations Design in Part of Southwestern Nigeria
Author: Adebisi Niyi Olaonipekun and Olufemi Sunday Tanimola
Source: Journal of Engineering Science 13: 89–106, 2016
 
- Abstract  

Various studies on geotechnical properties of soils, which underlain the part of the coastal area of Nigeria are yet to account for characteristics governing design and analysis of foundations. This study aims at elucidating consistency in local soil properties with respect to strength, and consolidation parameters for foundations design strategy. Field testing include 12 Cone Penetrometer Tests (CPT) and 15 number borings in Standard Penetration Tests (SPT). Disturbed and undisturbed soil sampling were done at various depths. All laboratory tests (natural moisture content, Atterberg limits, grain size analysis, undrain triaxial and oedometer consolidation) were in accordance with the British Standard 1377, BS (1990). Patterns of the penetration resistance-depth curves show that stratified soils dominate a group of foundation soils in the area. Particle size is in the order of distribution gravel < clay < silt < sand, with 10% to 30% by weight of fines. Coefficient of permeability values (1.0 × 10–10 ≤ k ≤ 4.7 × 10–8 m/s) revealed slow water movement with water content (15%–25%), and degree of water saturation range of 79%–94% which confirms partial saturation. Consistency limits showed that the soils have medium to very high plasticity index. They further confirm Illite and kaolinite as the major clay minerals in the soils. Allowable bearing pressures and coefficient of compressibility ranges are 242.77–384.91 kN/m2 and 0.030–0.965 m2/MN respectively. Despite the water and organic content, the soils can be non-problematic due low compressibility and high strength characteristics at sampling depth range of 10 and 22 m.

Keywords: Soil, stratified, saturated, strength, compressibility



 


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