Displaying publications 41 - 60 of 103 in total

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  1. Asra Hosseini
    MyJurnal
    From earliest cities to the present, spatial division into residential zones and neighbourhoods is the universal feature of urban areas. This study explored issue of measuring neighbourhoods through spatial autocorrelation method based on Moran’s I index in respect of achieving to best neighbourhoods’ model for forming cities smarter. The research carried out by selection of 35 neighbourhoods only within central part of traditional city of Kerman in Iran. The results illustrate, 75% of neighbourhoods’ area in the inner city of Kerman had clustered pattern, and it shows reduction in Moran’s index is associated with disproportional distribution of density and increasing in Moran’s I and Z-score have monotonic relation with more dense areas and clustered pattern. It may be more efficient for urban planner to focus on spatial autocorrelation to foster neighbourhood cohesion rather than emphasis on suburban area. It is recommended characteristics of historic neighbourhoods can be successfully linked to redevelopment plans toward making city smarter, and also people’s quality of life can be related to the way that neighbourhoods’ patterns are defined.
  2. Farzana Kabir Ahmad, Siti Sakira Kamaruddin
    Scientific Research Journal, 2015;12(1):1-10.
    MyJurnal
    The invention of microarray technology has enabled expression levels of thousands of genes to be monitored at once. This modernized approach has created large amount of data to be examined. Recently, gene regulatory network has been an interesting topic and generated impressive research goals in computational biology. Better understanding of the genetic regulatory processes would bring significant implications in the biomedical fields and many other pharmaceutical industries. As a result, various mathematical and computational methods have been used to model gene regulatory network from microarray data. Amongst those methods, the Bayesian network model attracts the most attention and has become the prominent technique since it can capture nonlinear and stochastic relationships between variables. However, structure learning of this model is NP-hard and computationally complex as the number of potential edges increase drastically with the number of genes. In addition, most of the studies only focused on the predicted results while neglecting the fact that microarray data is a fragmented information on the whole biological process. Hence this study proposed a network-based inference model that combined biological knowledge in order to verify the constructed gene regulatory relationships. The gene regulatory network is constructed using Bayesian network based on low-order conditional independence approach. This technique aims to identify from the data the dependencies to construct the network structure, while addressing the structure learning problem. In addition, three main toolkits such as Ensembl, TFSearch and TRANSFAC have been used to determine the false positive edges and verify reliability of regulatory relationships. The experimental results show that by integrating biological knowledge it could enhance the precision results and reduce the number of false positive edges in the trained gene regulatory network.
  3. Normah, Ismail, Ezzana Zuraini, Zainuddin
    Scientific Research Journal, 2015;12(1):1-12.
    MyJurnal
    Proteases were extracted from starfruit at maturity Index 2 (unripe, light green) and Index 7 (very ripe, orange) and partially purified using acetone and 40% ammonium sulfate precipitations. Higher yield and proteolytic activity were observed for proteases purified using acetone than 40% ammonium sulfate. As for maturity index, yield and protein concentration of proteases from Index 2 were higher than those from Index 7. SDS-PAGE result showed intense bands for acetone proteases while a distinct band at 50 kDa was observed in all the proteases. Enzyme activity decreased during the seven days storage at 4°C with minimum relative activity of 70% achieved for acetone proteases at day seven. This study suggested that acetone precipitation is more effective method for purifying starfruit protease based on the yield and proteolytic activity compared to using 40% ammonium sulphate precipitation. In order to obtain higher protein concentration and proteolytic activity, starfruit at the unripe stage, Index 2 is a better raw material than Index 7 to be used for protease production.
  4. Alhassan Salami Tijani, Nazri Mohammed, Werner Witt
    MyJurnal
    Industrial heat pumps are heat-recovery systems that allow the temperature of waste-heat stream to be increased to a higher, more efficient temperature. Consequently, heat pumps can improve energy efficiency in industrial processes as well as energy savings when conventional passive-heat recovery is not possible. In this paper, possible ways of saving energy in the chemical industry are considered, the objective is to reduce the primary energy (such as coal) consumption of power plant. Particularly the thermodynamic analyses of integrating backpressure turbine of a power plant with distillation units have been considered. Some practical examples such as conventional distillation unit and heat pump are used as a means of reducing primary energy consumption with tangible indications of energy savings. The heat pump distillation is operated via electrical power from the power plant. The exergy efficiency of the primary fuel is calculated for different operating range of the heat pump distillation. This is then compared with a conventional distillation unit that depends on saturated steam from a power plant as the source of energy. The results obtained show that heat pump distillation is an economic way to save energy if the temperature difference between the overhead and the bottom is small. Based on the result, the energy saved by the application of a heat pump distillation is improved compared to conventional distillation unit.
  5. Mohd Abdul Fatah Abdul Manan, M. Ibrahim M. Tahir, Crouse, Karen A., How, Fiona N.-F., Watkin, David J.
    MyJurnal
    The crystal structure of the title compound has been determined. The compound crystallized in the triclinic space group P -1, Z = 2, V = 1839.42(18) Å3 and unit cell parameters a = 11.0460(6) Å, b = 13.3180(7) Å, c = 13.7321(8) Å, a = 80.659(3)°, ß = 69.800(3)° and ? = 77.007(2)° with one disordered dimethylsulfoxide solvent molecule with the sulfur and oxygen atoms are distributed over two sites; S101/S102 [site occupancy factors: 0.6035/0.3965] and O130/O131 [site occupancy factor 0.3965/0.6035]. The C22-S21 and C19-S20 bond distances of 1.779(7) Å and 1.788(8) Å indicate that both of the molecules are connected by the disulfide bond [S20-S21 2.055(2) Å] in its thiol form. The crystal structure reveals that both of the 5-bromoisatin moieties are trans with respect to the [S21-S20 and C19-N18] and [S20-S21 and C22-N23] bonds whereas the benzyl group from the dithiocarbazate are in the cis configuration with respect to [S21-S20 and C19-S44] and [S20-S21 and C22-S36] bonds. The crystal structure is further stabilized by intermolecular hydrogen bonds of N9-H35···O16 formed between the two molecules and N28-H281···O130, N28-H281···O131 and C41-H411···O131 with the solvent molecule.
  6. Muhamad Hafizuddin Mohamad Basir, Bulan Abdullah, Siti Khadijah Alias
    MyJurnal
    This research investigates and analyzes wear properties of 316 stainless steel before and after applying paste boronizing process and to investigate the effect of shot blasting process in enhancing boron dispersion into the steel. In order to enhance the boron dispersion into 316 stainless steel, surface deformation method by shot blasting process was deployed. Boronizing treatment was conducted using paste medium for 8 hours under two different temperatures which were 8500 C and 9500 C. Wear behaviour was evaluated using pin-on-disc test for abrasion properties. The analysis on microstructure, X-ray Diffraction (XRD) and density were also carried out before and after applying boronizing treatment. Boronizing process that had been carried out on 316 stainless steel increases the wear resistance of the steel compared to the unboronized 316 stainless steel. The effect of boronizing treatment together with the shot blasting process give a greater impact in increasing the wear resistance of 316 stainless steel. This is mainly because shot blasted samples initiated surface deformation that helped more boron dispersion due to dislocation of atom on the deformed surface. Increasing the boronizing temperature also increases the wear resistance of 316 stainless steel. In industrial application, the usage of the components that have been fabricated using the improved 316 stainless steel can be maximized because repair and replacement of the components can be reduced as a result of improved wear resistance of the 316 stainless steel.
  7. Siti Roshayu Hassan, Nastaein Qamaruz Zaman, Irvan Dahlan
    MyJurnal
    The performance and operational characteristics of a laboratory scale modified anaerobic hybrid baffled (MAHB) reactor were studied using recycled paper mill effluent (RPME) wastewater. MAHB reactor was continuously operated at 35°C for 90 days with organic loading rate (OLR) increased from 0.14 to 0.57 g/L/dy. This present study demonstrated that the system was proficient in treating low strength RPME wastewater. Highest carbon oxygen demand (COD) removal were recorded up to 97% for an organic loading of 0.57 g /L/dy while effluent alkalinity assured that the system pH in the MAHB compartments were of great advantages to acidogens and methanogens respectively. Methane and biogas production rate shows increment as the load increases, which evidently indicated that the most significant approach to enhance gas production rates involves the increment of incoming substrate moderately. Variations of biogas and volatile fatty acid (VFA) in different compartments of MAHB reactor indicated the chronological degradation of substrate. The compartmental structure of MAHB reactor provided its strong ability to resist shock loads. From this present study, it shows the potential usage of MAHB reactor broadens the usage of multi-phase anaerobic technology for industrial wastewater treatment.
  8. Rosmilah Misnan, Nurul Izzah Abdul Rahman, Zailatul Hani Mohd Yadzir, Noormalin Abdullah, Mohd Faizal Bakhtiar, Shahnaz Murad
    MyJurnal
    Crab meat is widely consumed in several countries around the world. However, when consumed, crab meat are frequent cause of allergic reactions throughout the world. Scylla serrata is among the most common mud crab in Malaysia. In a previous study two major allergens of mud crab at 36 and 41 kDa was identified. Thus, the aim of this study is to further identify these major allergens by a proteomic approach. Protein extract was prepared and resolved by 2-dimensional electrophoresis (2-DE). Immunoblotting was then performed using reactive sera from patients with crab allergy. Major allergenic spots were then excised from the 2-DE gel and analysed by mass spectrometry. The 2-DE profile of the extract revealed approximately >100 protein spots between pH of 4.00 to 8.00. Mass spectrometry analysis has identified the 36 and 41 kDa proteins as tropomyosin and arginine kinase, respectively. Our findings indicated that tropomyosin and arginine kinase play a major role in allergic reaction to mud crab meat among local patients with crab meat allergy, and should be included in diagnostics and therapeutic strategies of this allergy.
  9. Nur Farahiah Ibrahim, Zahari Abu Bakar, Azlina Idris
    Scientific Research Journal, 2015;12(1):1-12.
    MyJurnal
    Channel estimation techniques for Multiple-input Multiple-output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) based on comb type pilot arrangement with least-square error (LSE) estimator was investigated with space-time-frequency (STF) diversity implementation. The frequency offset in OFDM impacts its performance. This was mitigated with the implementation of the presented inter-carrier interference self-cancellation (ICI-SC) techniques and different space-time subcarrier mapping. STF block coding in the system exploits the spatial, temporal and frequency diversity to improve performance. Estimated channel was fed into a decoder which combines the STF decoding together with the estimated channel coefficients using LSE estimator for equalization. The performance of the system is compared by measuring the symbol error rate with a PSK-16 and PSK-32. The results show that subcarrier mapping together with ICI-SC were able to increase the system performance. Introduction of channel estimation was also able to estimate the channel coefficient at only 5dB difference with a perfectly known channel.
  10. Amalina Mohd Tajuddin, Hadariah Bahron, Shahrul Nizam Ahmad
    MyJurnal
    Six new Pd(II) and Ni(II) metal complexes of N, O-bidentate (L1, L2) and ONNO-tetradentate (L3) Schiff base ligands have been synthesized. The compounds were characterized via various physicochemical and spectroscopic techniques namely elemental analysis (CHN), FT-IR, 1H and 13C NMR as well as magnetic susceptibility measurement. All complexes showed diamagnetism indicating that they are square planar complexes. Catalytic performance of Pd(L1)2 and Pd(L2)2 were investigated for Heck cross-coupling reaction under optimum operating parameters, monitored using GC-FID for 6 h of reaction time in inert conditions. High catalytic activities of up to 90% were observed in the presence of triethylamine as base and DMA as solvent at 100oC with 1 mmol% catalyst loading. The mechanism of catalyzed Heck reaction is proposed to go through a series of conversion of Pd(0)/Pd(II).
  11. Muhamad Faridz Osman, Karimah Kassim
    MyJurnal
    The coordination complexes of Co(II) and Zn(II) with Schiff bases derived from ophenylenediamine and substituted 2-hydroxybenzaldehyde were prepared. All compounds were characterized by Fourier transform infrared (FTIR) spectroscopy and Nuclear magnetic resonance (NMR) spectroscopy elemental analyzers. They were analyzed using impedance spectroscopy in the frequency range of 100Hz - 1MHz. L1 and L2 showed higher conductivity compared to their metal
    complexes, which had values of 1.37 x 10-7 and 6.13 x 10-8S/cm respectively.
  12. Muhamad Faiz Musa, Mohd Reeza Yusof, Noor Sahidah Samsudin, Faridah Muhamad Halil
    MyJurnal
    The construction industry should move from conventional construction method and adopt the
    industrialisation concept, to increase productivity and deliver quality construction end products.
    Industrialisation is the combination of a large market to divide into fractions the investment in
    strategies and innovation, in return, of simplifying the production and, therefore, reducing the costs.
    The introduction of Degree of Industrialisation by Roger-Bruno Richard is critical to the construction
    industry. The five degrees of industrialisation are prefabrication, mechanisation, automation, robotics
    and reproduction. Richard’s Degree of Industrialisation is in line with the Malaysian government’s
    vision to be a developed nation by 2020, to push forward the use of innovative technologies in most
    industries including the construction industry. The adoption of industrialisation and innovations in
    the Malaysian construction industry has the potential to solve the current problems in the
    construction industry. The problems are the inferior quality of products and processes, a poor site
    working conditions, low construction productivity, high construction cost, relying on foreign workers
    and lack of skill labours. The adoption of industrialisation and innovations promote sustainability in
    the construction environment. The objectives of the study are to investigate whether the adoption of
    industrialisation in the construction environment promotes sustainability and to identify the current
    level of industrialisation of the Malaysian construction industry. The methodologies of the study are
    semi-structure interview and observation. The Malaysian construction industry is ready to embrace
    industrialisation in construction environment in limited areas and industrialisation promotes
    sustainability in the construction environment.
  13. Engku Liyana Zafirah Engku Mohd Suhaimi, Jamil Salleh, Suzaini Abd Ghani, Mohamad Faizul Yahya, Mohd Rozi Ahmad
    MyJurnal
    An investigation on the properties of Tenun Pahang fabric performances using alternative yarns was conducted. The studies were made in order to evaluate whether the Tenun Pahang fabric could be produced economically and at the same time maintain the fabric quality. Traditional Tenun Pahang fabric uses silk for both warp and weft. For this project, two alternative yarns were used which were bamboo and modal, which were a little lower in cost compared to silk. These yarns were woven with two variations, one with the yarns as weft only while maintaining the silk warp and the other with both warp and weft using the alternative yarns. Four (4) physical testing and three (3) mechanical testing conducted on the fabric samples. The fabric samples were evaluated including weight, thickness, thread density, crease recovery angle, stiffness and drapability. The results show that modal/silk and bamboo silk fabrics are comparable in terms of stiffness and drapability, hence they have the potential to replace 100% silk Tenun Pahang.
  14. Aliyin Abdul Ghani, Hadariah Bahron, Mohamad Kamal Hj Harun, Karimah Kassim
    MyJurnal
    Two Schiff bases, 3-(4-hydroxyphenylimino)-1,3-dihydroindol-2-one (OPI) and 3-(4-Chlorophenylimino)-1,3-dihydroindol-2-one
    (CPI) were successfully synthesized through condensation
    reactions giving yields of 82% and 63%, respectively. The compounds were characterized via
    physical and spectroscopic techniques, namely elemental analysis (C, H, N), 1H and 13C Nuclear
    Magnetic Resonance (NMR) spectroscopy, Fourier Transform Infrared (FTIR) spectroscopy and
    melting point. The corrosion inhibiting property of the Schiff bases on mild steel in 1 M HCl solution
    was investigated by the weight loss (WL) measurements, electrochemical impedance spectroscopy
    (EIS) and linear polarization resistance (LPR). The concentrations of the Schiff bases were varied
    from 1 x 10-3 M to 1 x 10-5 M. The inhibition efficiencies obtained from all the methods employed were
    in good agreement where the percentage of inhibition efficiencies increased with concentration. OPI
    showed better inhibition efficiency than CPI with 91 % highest inhibition efficiency at 1 x 10-3 M
    additive concentration. This is likely to be caused by the resonance donating effect due to the
    presence of the hydroxyl group. The adsorption behaviour obeyed Langmuir isotherm for monolayer
    formation.
  15. Wan Razarinah, W. A. R., Noor Zalina, M., Noorlidah Abdullah
    MyJurnal
    Leachate (liquid pollutant), which is highly contaminated with organic matter and toxic substances is a major
    problem that arised from landfill. Biological methods have proven to be effective to remove organic matters that are
    abundant in leachate. This study is intended to compare the used of free mycelia and immobilized mycelia of the
    white-rot fungi, Ganoderma australe for the removal of landfill leachate organics. The organics fraction of landfill
    leachate was measured by biological oxygen demand (BOD5), and chemical oxygen demand (COD). The experiment
    revealed that free mycelia of G. australe showed capability in removing leachate BOD5 but not COD. However, the
    use of immobilized G. australe displayed the best result in the removal of BOD5 and COD leachate after 4 weeks of
    treatment in flasks with 93.09% and 17.84% percentage removal of BOD5 and COD, respectively. Therefore, G.
    australe can be considered potentially useful in the treatment of landfill leachate as they can help in removing BOD
    and COD due to their biodegradative abilities.
  16. Nur Rejai Salmah Abdul Hakeem, Nuruljannah Md Yusof, Aisyah Hasyila Jahidin, Mizaton Hazizul Hasan, Hannis Fadzillah Mohsin, Ibtisam Abdul Wahab
    MyJurnal
    Vitex trifolia or locally known as lemuni, is well documented for its medicinal properties including
    anticancer, antibacterial and wound healing. For years, the leaves and flowers were consumed for antiaging
    and general well-being. It is also commonly served as nutraceuticals to post-partum women during
    their confinement period. Previous study showed that V. trifolia possesses high antioxidant properties that
    could prevent oxidative stress related diseases such as cancer, atherosclerosis, diabetes and many more.
    From the literature, V. trifolia leaves are used as poultice for rheumatic pains, sprains, antithelmintics and
    inflammations. Meanwhile, the fruits are utilised in amenorrhea. The roots, on the other hand, are used for
    the treatment of cough and fever. The plant is known to possess pharmacologically-active constituents such
    as the essential oil, halimane-type diterpenes, flavonoids, triterpenes, lignans, iridoids and ecdysteroids.
    Review papers were consistently published to justify the non-exhaustive biological exploration of this genus.
    Nevertheless, only 11 per cent of the total Vitex species were phytochemically examined. Apart from being
    eaten raw or blanched, Vitex is also taken as a food colourant in preparing lemuni rice. The process of
    making lemuni rice is quite tedious. First, the leaves and flowers are picked and washed. Both parts are then
    ground with water and sieved to give a bluish extract which is then mixed with rice and boiled to cook.
    Hence, the Vitex pouch is introduced to provide an easy way to prepare lemuni rice. This packaging is
    designed to enclose Vitex samples in a pouch that simply can be placed together with rice and boiled to
    cook. Such instant preparation will hopefully promote the consumption of lemuni rice among busy locals.
    Future plans include international marketing and production of other Vitex nutritional products.
  17. Raihana Mohamad Hata, Rohana Hassan, Fadzil Arshad, Haslin Idayu
    MyJurnal
    This paper provides a review on the effect of solar radiation to the different building materials properties.
    Solar radiation; watt per meter square [W/m2
    ] is one of the cause for thermal gain in building envelopes.
    Buildings envelopes comprises of various materials. Different materials have different rate of heat
    absorption depends on their emissivity and other parameters. The three materials studied in this paper
    are concrete, timber and composites materials. According to the radiation heat equation, heat rate are
    affected by the surface area of exposed envelope (A) measure in meter (m), emissivity of the building
    exposed surface (ε) and the temperature difference between envelope exposed surface (Ts) and
    temperature of equivalent atmosphere (Tsky) measure in 0C. Based on the parameters, research
    methodology were adopted either by software simulation or test field experimental. Solar radiation
    affects the materials in various ways, depends on parameters considered, location of testing and type of
    materials.
  18. Siti Zulaikha Suhaili, Muhamad Kamil Yaakob, Umi Sarah Jais, Siti Irma Yuana Saaid
    MyJurnal
    Pure TiO2 and Cr doped TiO2 (0.1-1.0wt% Cr) nanoparticles were synthesized via sol gel method. This
    study focusing on narrowing the TiO2 band gap energies in order to enhance the photocatalytic efficiency
    under visible light. The synthesized samples were characterized by X-Ray diffraction method (XRD), field
    emmision (FESEM) and also UV-Vis diffuse reflectance spectroscopy (DRS).The photocatalytic activity
    under sunlight irradiation was demonstrated by photocatalytic decomposition of methylene blue in water
    using UV/Vis spectrophotometer. The XRD analysis of pure TiO2 and doped TiO2 calcined at 500oC
    showed a mixture of anatase and rutile phases with decreasing crystallites size from 13.3 nm to 11.6 nm
    as the concentration of Cr was increased. The anatase-rutile phase transformation increased from 28.8%
    to 57.4%. An indication shows that at 0.75wt% Cr the anatase and rutile phases have equal composition
    percentage. This study demonstrated that band gap energy of TiO2 was reduced with Cr doping which
    could enhance the photocatalytic efficiency. Sample containing 1.0wt% exhibit the lowest optical band
    gap energy at 2.86 eV. The optimum chromium doping concentration was found to be at 0.1 wt% Cr
    corresponding to band gap energy of 2.87 eV and degradation rate of 84%.
  19. Wan Isni Sofiah Wan Din, Saadiah Yahya, Mohd Nasir Taib, Ahmad Ihsan Mohd Yassin, Razulaimi Razali
    Scientific Research Journal, 2016;13(1):1-11.
    MyJurnal
    Clustering in Wireless Sensor Network (WSN) is one of the methods to minimize the energy usage of
    sensor network. The design of sensor network itself can prolong the lifetime of network. Cluster head in
    each cluster is an important part in clustering to ensure the lifetime of each sensor node can be preserved
    as it acts as an intermediary node between the other sensors. Sensor nodes have the limitation of its
    battery where the battery is impossible to be replaced once it has been deployed. Thus, this paper
    presents an improvement of clustering algorithm for two-tier network as we named it as Multi-Tier
    Algorithm (MAP). For the cluster head selection, fuzzy logic approach has been used which it can
    minimize the energy usage of sensor nodes hence maximize the network lifetime. MAP clustering
    approach used in this paper covers the average of 100Mx100M network and involves three parameters
    that worked together in order to select the cluster head which are residual energy, communication cost
    and centrality. It is concluded that, MAP dominant the lifetime of WSN compared to LEACH and SEP
    protocols. For the future work, the stability of this algorithm can be verified in detailed via different data
    and energy.
  20. Siti Noraini Abu Bakar, Huda Abdullah, Kamisah Mohamad Mahbor, Shahida Hanum Kamarullah
    MyJurnal
    In this study, extracted plumeria and celosia cristata flowers have been used as the sensitizer for dyesensitized
    solar cells (DSSC). The cells were fabricated using TiO2 as a semiconductor layer
    deposited on transparent Indium doped tin oxide (ITO) conductive glass using a spin coating
    technique. The films with dyes were characterized by UV-VIS absorption spectra. The photovoltaic
    properties of DSSC were studied under an incident irradiation of 100 mW/cm2
    . The I-V characteristic
    curves of all fabricated cells were measured and analysed. The energy conversion efficiency (η) of the
    cells consisting of plumeria extract and celosia cristata extract was 3.73 × 10-6
    and 1.18 × 10-7 respectively.
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