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  • 1
    Publication Date: 2018-11-09
    Description: This paper presents a study on the rheological and mechanical properties of self-compacting concrete (SCC) with recycled steel fibers recovered (SFR) from waste tires. SFR were added separately to SCC mixtures at volume fraction of 0.5, 0.8, 1 and 1.5%. Water to cement ratio of 0.46, gravel to sand ratio of 1.0 and superplasticizer content of 1.0% (by weight of cement) were kept constant in the all SCC mixtures. Five SCC mixtures were tested for their rheological properties by using slump flow diameter, T500 slump flow time, V-funnel flow time, L-box ratio, and the segregation resistance test. The 28-day compressive strength, flexural strength and shrinkage were also investigated. The results showed that adding recycled steel tires fibers reduced the rheological characteristics of the self-compacting concrete. It was also revealed that, increasing the content of recycled steel fibers reduced slightly the compressive strength and shrinkage but improves flexural strength.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 2
    Publication Date: 2018-12-13
    Description: Electrospinning polymer has been acknowledged as an effective technique for the fabrication of polymer nanofiber. In recent years many polymers have been successfully electrospun into thin smooth uniform fibers. In this study, the effect of various process parameters on the morphology and diameter of fibers obtained from a solution of PET in Trifluoracetic acid and Dichloromethane in (1:3) ratio were illustrated. The selected factors that were to be controlled for this experiment are the concentration of PET in the solution, flow rate, applied voltage, and needle-tip to the collector distance. L9Orthogonal arrays of Taguchi design, S/N ratio and analyses of variance ANOVA are used to arrange the number of trials, analyses and observe the optimum conditions for the fabrication of PET. For this, the best level of the factors was determined as PET concentration (5%), flow rate (1ml/h), voltage (15 Kv) and distance (15 cm) in order to obtain small fiber in diameter.
    Print ISSN: 1757-8981
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 3
    Publication Date: 2017-08-15
    Description: Studies have shown that many Malaysian non-technical students have low motivation in learning ICT course due to a number of reasons, such as a lack of learning practice and effective learning applications. In view of such a problem, the researchers carried out a quasi-experimental study to examine the impact of a novel mobile augmented reality learning application (MARLA) on students’ motivation in learning a topic of a university ICT course. The research was based on the pretest-posttest control group design, and the study sample consisted of 120 non-technical undergraduates majoring in social science, with a mean age of 19.5 years. They were divided into an experimental group and a control group. The dependent variable was students’ motivation in learning, and the independent variables were learning method and gender. The experimental group used MARLA on their mobile devices to learn one of the topics of the ICT Competency course, namely Computer System; whereas the control gr...
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 4
    Publication Date: 2018-08-01
    Description: The wide-ranging evolution of remote sensing technology has offered a promising application to the hydrographic surveying, the Satellite-Derived Bathymetry (SDB). SDB is a contemporary acquisition technique which derives bathymetric data from multispectral satellite imagery for various hydrographic purposes. The introduction and availability of the chargeless Sentinel-2A multispectral satellite data in the region, has inspired the National Hydrographic Centre (NHC) and Universiti Teknologi Malaysia (UTM) to collaborate in assessing the level of accuracy provided by Sentinel-2A imageries as a data sources for shallow water hydrographic mapping. The assessment is concentrating on both empirical algorithm methods, Lyzenga and Stumpf models in two different seabed topology conditions. Both Lyzenga and Stumpf model produced almost identical results for the area with normal gradient seabed. Conversely, for the rough and irregular seabed surface, results from Lyzenga model was much bet...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
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  • 5
    Publication Date: 2018-04-15
    Description: The dependency on fish meal as a major protein source for animal feed can lead toit priceinstability in line with the increasing in meat production and consumption in Indonesia. In order todeal with this problem, an effort to produce an alternative protein sources production is needed. This scenario is possible due to the abundantavailability of agricultural residues such as rice straw whichcould be utilized as substrate for production of single cell proteins as an alternative proteinsource. This work investigated the potential utilization of rice straw pulp and urea mixture as substrate for the production of local Trichoderma reesei single cell protein in solid state fermentation system. Some parameters have been analyzed to evaluate the effect of ratio of rice straw pulp to urea on mixed single cell protein biomass (mixed SCP biomass) composition, such as total crude protein (analyzed by kjedhal method) and lignin content (TAPPI method).The results showed that crude pro...
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 6
    Publication Date: 2018-06-02
    Description: Aviation maintenance is a multitasking activity in which individuals perform varied tasks under constant pressure to meet deadlines as well as challenging work conditions. These situational characteristics combined with human factors can lead to various types of human related errors. The primary objective of this research is to develop a structural relationship model that incorporates human factors, organizational factors, and their impact on human errors in aviation maintenance. Towards that end, a questionnaire was developed which was administered to Malaysian aviation maintenance professionals. Structural Equation Modelling (SEM) approach was used in this study utilizing AMOS software. Results showed that there were a significant relationship of human factors on human errors and were tested in the model. Human factors had a partial effect on organizational factors while organizational factors had a direct and positive impact on human errors. It was also revealed that organiza...
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 7
    Publication Date: 2018-07-25
    Description: Some of the factors that causing abuse of alcohol by adolescents are the descendants, families influences, friends influence, ethnicities, and personal issues. Today’s teenage problems are complex and worrying. This is indicated by the low knowledge of adolescents about the dangers of alcohol for health. The importance of knowledge about the danger of alcohol for health is needed. Therefore, adolescents need to get enough information to know how dangerous alcohol. Peer group is a method of delivering information through peers that effective to use in adolescents. The study aims to determine the effect of health education with peer group approach toward adolescents’ knowledge about the dangers of alcohol for health in the village of Wungkolo, District of South Wawonii, Konawe Islands. The study did not use the Pre-Experiment with the control group. The sampling technique is purposive sampling , with 17 people as the samples. The results of statistical test pair t-test obtai...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
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  • 8
    Publication Date: 2018-04-07
    Description: In order to fabricate a thermoelectric device on glass substrate for harvesting waste heat energy through house appliances, the Seebeck coefficient of translucent TiO 2 thin film was investigated. The TiO 2 thin film was synthesized by using hydrothermal method with F-SnO 2 coated glass as substrate. From scanning electron microscopy analysis, the synthesized TiO 2 thin film was found to be in nanometer-scale rod structure with a thickness of 4 µm. The Seebeck coefficient was measured in the temperature range of 300 – 400 K. The Seebeck coefficient is found to be in negative value which shows that synthesized film is an n-type semiconductor material, and is lower than the value of bulk-size material. This reduction in Seebeck coefficient of TiO 2 thin film is likely due to the low dimensional effect and the difference of carrier concentration.
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 9
    Publication Date: 2018-04-07
    Description: Transparent and flexible film of poly (ethyl methacrylate) incorporated with 1-ethyl-3-methyl imidazolium bis(trifluorosulfonyl) imide ionic liquid (PEMA-EMITFSI) with thickness between 100 and 200 µm was fabricated by using solution casting technique. From the ionic transport measurement, it is confirmed that the electrical conduction in PEMA-EMITFSI film is mainly contributed by ionic transport. Moreover, the temperature-dependence of electrical conductivity measurement for 7 days reveals that the electrical properties of PEMA-EMITFSI film could be able to withstand a number of thermal cycles and be lasting for a period of time for potentially used as thermoelectric material through thermal heating.
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 10
    Publication Date: 2018-05-23
    Description: Colorant is one of the additives to give a better appearance or improve the colour of the product. Synthetic colorant has been widely used in industrial due to its readiness in the market and its colour stability. However the arising issues related to the safety, nutrition and also the therapeutic effect has encouraged users to become more concern about the colouring component. Thus, the present research was conducted in order to produce natural colorant called bixin from Bixa orellana or also known as annatto seeds. The study was focusing on the effect of the solvent on the characteristic and concentration of the extracted bixin. While stability of the bixin during different storage condition was determined to further validate the effectiveness of the solvent. The result indicated that methanol and acetone gave darker of the bixin colour as compared to the water. However, the deterioration rate of the bixin in acetone and methanol were faster as compared to the water. Th...
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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