eJournal Jabatan Pendidikan Politeknik dan Kolej Komuniti
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Optimizing Abrasive Water Jet Machining Parameters on Cutting Hybrid Metal Matrix Composites Al7075 by Genetic Algorithm
Get PDFHybrid Metal Matrix Composites (MMC) Al7075 is a difficult-to-cut material that required non-conventional machining to manufacture automotive, aerospace, and defence components. The composite with minimum Bottom Kerf Width is much desire than minimum Top Kerf Width by the industries. Furthermore, the material cut with less defective work piece can be achieved by Abrasive Water Jet Machining (AWJM), compared to other nonconventional machining. The minimum kerf width lessens the energy used and waste resulted. Moreover, cutting Hybrid MMC Al7075 by AWJM, adding the advantages such as of good quality cutting of composite material, lessen water usage and waste production. These facts formulated that this study aims to search the minimum TKW for three types of Hybrid MMC Al7071 composites machined by AWJM. The data in this study used to model machining parameters as the input and TKW as the output using regression analysis. The model used as fitness function for Genetic Algorithm (GA) to search the minimum TKW. And from this search result, the optimal machining parameters can be determined. Finally, the result of experimental data is compared to the search data. The comparison confirmed that by GA, lesser minimum TKW is obtained, with the lowest value is 6.93% decreased
Designing ESP32 Base Shield Board for IoT Application
Get PDFNowadays, the ESP32 chip\u27s popularity grows that makes it a perfect solution to build an Internet of Things (IoT) application. During the prototype phase, the ESP32 development board can be plugged on top of the shield board to extend its general-purpose input/output (GPIO) pins. In this paper, an ESP32 base shield board with onboard LEDs have been designed to overcome the coding and circuit troubleshoot problems among beginners. This proposed shield board consists of the male header pin, which extends all the GPIO pins of DOIT ESP32 DevKit V1 with additional header pins for 5V, 3.3V, and GND. The GPIO pins are connected to LEDs, which function as an indicator that shows either the GPIO pins receive signal 5V (logic 1) or 0V (logic 0). Two sample application are illustrated in the paper. The result showed that the ESP32 Base Shield Board provides easy hardware interfacing and flexibility in connecting the peripheral unit and Node MCU. Its onboard LEDs are not as output only but act as an indicator to know what happens on that pin and make it easy to troubleshoot either coding or circuit problems. This product is a beginner-friendly design, low cost, and reliability for IoT testing prototype and educational purposes
The Working Adult Intentions’ to Pursue Lifelong Learning Education
Get PDFNowadays there are many opportunities for everyone to further full time or part-time studies. Education institutions such as universities, polytechnics and college communities offer a lot of programs and courses via online and offline. As for working adults, pursuing study for self-improvement, whilst others may require for expanding their profession or to stay competitive in their current career. Ministry of Higher Education (MOHE) promotes lifelong learning education under these agencies where polytechnics and college communities to act as a provider for lifelong learning to working adults to pursue their study. Unfortunately, the enrolment of working adult still low due to several constraint such as time management, financial, families and lack of self-motivation in engaging student communities. Therefore, working adults need to consider various factors before they decide to further their study. This study aims to identify the factors that influence working adult’s intention to pursue lifelong learning education from aspects of attitude, social norms and self-efficacy. The study was conducted using a quantitative approach which involved 306 respondents from private and government sectors in different companies and offices around Ipoh, Perak. Statistical analysis revealed that the social norms and self-efficacy are the most positive factors that influence the working adult intentions’ in pursuing study
Hubungan Di Antara Sinisisme Pekerja Terhadap Perubahan Khusus Dengan Niat Untuk Menentang Perubahan Organisasi
Get PDFEmployee’s cynicism towards organizational change or known as change-specific cynicism refers to the tendency of employees to be cynical about any changes introduced by their respective organisations. This study examines the relationship between change-specific cynicism with intention to resist changes. A total of 263 teachers working in the Polytechnics in Malaysia have been chosen as sample in this study. The findings of this study state that there is a positive relationship between change-specific cynicism with the intention to resist change. Theoretical and practical implications of the study details as well as suggestions for future research are discussed
Peranan Faktor Pemangkin Dalam Perancangan Kerjaya Lulusan Kolej Komuniti
Get PDFCommunity Colleges is an alternative platform for mediocre and low achievers to achieve their dream careers. In fact, a meticulous and careful planning can enable community college graduates to generate high income careers through the Technical and Vocational skills education and training obtained. However, these students need some assistance in planning their careers and require a certain catalyst to ensure that it can be implemented. This study was conducted to identify influential catalyst factors among Community College graduates career planning in facing the ordeal of the challenging career world. This quantitative study was conducted on 222 community college graduates of Melaka and Negeri Sembilan regions as a study sample exceeding the minimum sample recommendation of G Power application for analysis involving t- test (102), One-way Anova (159) and Pearson Correlation (115). Data were collected using a Google Form questionnaire and analyzed with SPSS 23.0 to obtain the results. The findings of the study show that the Catalyst Factors are (1) External Courses (mean = 4.44; p = .646); (2) Scientific Visits (min = 4.34; p = .126); (3) Co-curriculum (min = 4.27; p = .121); and (4) Part-Time Job (mean = 4.15; p = .176) has an influence in Community College Graduate Career Planning. These factors, on the other hand, do not have significant differences in gender groups and study programs for career planning of community college graduates. However, there is a moderate correlation (r = .602) between the Catalyst Factor and the Career Planning of Community College Graduates. Hence, these findings can be utilized as a guideline for community college management in designing career development programs for Community College students
Persepsi Pelajar terhadap Model Smart Autogasi
Get PDFSmart Autogasi (SA) is an automatic watering system that has been developed by lecturers of Diploma unit, Electrical unit and Landscape unit at Masjid Tanah Community College (KKMT). SA has been adopted at the chili fertigation nursery at KKMT. This study was conducted to identify the perception of the use of SA in chili fertigation nurseries for students based on SA criteria that is easy to use and user friendly. A total of 54 respondents who answered the questionnaire and data were analysed using Statistical Package for Social Science Software version 23.0 (SPSS) to obtain mean scores, t test and anova. The questionnaire instrument used was built by the researcher himself and has received face validity approval from Dr. Ahmad Rosli Bin Mohd Nor and content validity from Hj. Norasid Bin Majid is an expert in technical fields at KKMT. The results show that the level of perception of participants for all aspects at a high level with an average score of 4.44 and significant value (p) by gender for all aspects is greater than 0.05, this indicates that gender factors do not affect the level of perception of participants in this model. Studies prove that this course has given a good perception from the aspect of education to the participants and it is not influenced by gender factors. The next study is to look at the effectiveness of the use of SA in chilli fertigation nurseries in KKMT
Effect of ABS on the Mechanical Properties of PP/ABS Blends and Tensile Strength Using Taguchi Method
Get PDFPolymer blend becomes one of the effective methods in the development of polymer industries. By applying this technique, it can help to control the environment and create new material with better performance from a net polymer. PP and ABS are the most extensively used commodity polymer due to their good mechanical properties. The aim of this study is to identify the injection molding parameters of PP and ABS such as melt temperature, mold temperature, injection pressure and holding pressure and is to inspect the mechanical properties of hybrid material between ABS and PP such as tensile strength, tensile modulus, and elongation. The relationship between the control parameters and the output response for the hybrid material has also been determined. The samples of PP/ABS blends were prepared via injection molding and have been categorized based on weight percentage. The parameter setting was selected based on the data available in the literature and suggested from resin supplier which is mold temperature, melt temperature, injection and holding pressure. The results showed that with the addition of ABS, the tensile stress is reduced causing the material becomes brittle. With the increasing content of ABS in PP/ABS blends, the tensile modulus will increase while the percentage of elongation in PP/ABS blends decreased. Holding pressure was the most significant effects for tensile strength in PP/ABS blends found from Signal to Noise Ratio (S/N) in the Taguchi Method
Parameter Optimization of Friction Stir Welding Process by using RSM on Dissimilar Welded AA6061-AA7075
Get PDFIn this study, the joining of dissimilar between AA6061 and AA7075 with thickness of 3 mm was perform by using a friction stir welding (FSW) method. Response surface methodology (RSM) was choose to optimize effective factors during FSW process. The result of process parameter on impact toughness of welded butt joint was studied. Rotational and transverse speed were the main process parameters which were taken into consideration. Three levels of the tool rotational and welding speed in the range of 900–1100 rpm and 90–110 mm/min were studied via a central composite design (CCD). The optimal process parameters were decided with reference to impact toughness of the joint. By using the optimum parameter, the projected optimum percentage of the impact toughness was confirmed by doing the experiment. The result indicated that the joint formed using the rotational speed is 1000 rpm and welding speed of 110 mm/min and 1100 rpm and 110 mm/min show the highest and lowest joint impact toughness is 5.404 J and 3.404 J, respectively. The joining impact toughness result is higher compare to the base metal. The Anova table has showed that the entire method are important to adequate the scientific model, where the residual blunder among investigational and theoretic is 3.02%. Microstructural observation has discovered the change of a recrystallization especially in SW region have significant effect on impact toughness and hardness test
Penggunaan Serat Selulosa Di Dalam Panel Konkrit (IBS)
Get PDFIBS components are widely used nowadays due to the lower concrete panels. This IBS has the potential to be lightweight, economical, facilitating construction and environmental friendly works. Previous studies have begun to focus on the modification of concrete panels (IBS) by added material to enhance the capacity of the concrete properties of the panel. In this study, the "concrete panel", with the density of 1600kg/m³ was produced with the use of 0.3% and 0.5% of the cellulose fibre-added substance. Separation of fibre from recycled paper through the process of "Deinking washing". Laboratory tests are compression strength test at the age of the concrete in the age of 7 and 28 days. The results of compressive strength testing showed the use of a percentage of total fibre of 0.3% to increase compression strength by 1.7% at age 28 days. For the 0.5% compression of compressive strength increased by 2.7%. Therefore, the results of compression test prove that the concrete panel (IBS) has achieved the desired strength
Kesan Penambahan Abu Sekam Padi Terhadap Sifat Mekanikal Batu Bata
Get PDFBricks are artificial stones made from basic materials such as sand, cement, and water that are produced in a certain shape and then dried to harden. In brick making, it is done with or without additives. In this study, rice husk ash was added to 5 different brick samples to find the optimum composition and to determine the properties of the rice husk ash in terms of compressive strength, density, and water absorption. The results showed that sample A with a ratio of cement, sand, and ash of 1:5:1 gave the best result compared to commercial brick readings and other samples with compressive strength values of 136.25kN, 1505kg/m3 density and 12.07% moisture absorption. Hence, it produces a saving of 16% of silica sand usage in commercial bricks but retaining the same properties as commercial bricks