Jurnal Pendidikan Teknologi Kejuruan
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The freedom to learn-independent campus curriculum for shielded metal arc welding: A teaching module development
Full text linkThis study was triggered by the existing teaching modules for the Shielded Metal Arc Welding (SMAW) subjects taught at vocational high schools, which do not align with the Freedom to Learn-Independent Campus (FLIC) learning objectives, and do not provide a systematic organization. In order to enhance the learning experience, this research developed a new learning module that integrated Problem-based Learning (PBL), promoting critical thinking, and the practical application of theoretical concepts, following the FLIC curriculum. Utilizing a Research and Development (R&D) approach with the Instructional Design Institute (IDI) model, this study involved two welding instructors and four lecturers as validators to assess the content and usability of the module. The IDI model comprised three steps: instructional (define), development (develop), and institute (evaluate). The research findings regarding the validity assessment by subject matter experts yielded a final validity score of 0.924, while media and language experts provided a score of 0.936, meeting the valid criteria. The practical usability test of the learning module resulted in a score of 94%, indicating that it is highly practical for students to use as learning media. Based on the validity and practicality assessments of the developed module, it can be concluded that the SMAW learning module is highly practical to use as teaching media, aligning with FLIC curriculum
Design analysis configuration and capacity of off-grid with implementation of photovoltaic (PV) and battery energy storage system (BESS) as power supply for shipping activities at ports
Full text linkThe government of Indonesia developing mitigation for climate change and achieving decarbonization in the sea transportation sector by encouraging increased use of onshore power supply for ships when berthing at ports. Off-Grid is one of the green transition technologies that provide great benefits to ports for the mitigation of environmental. To ensure optimal system operation, determining the proper configuration and component sizes is an important decision at the design stage. One of the important activities at the port is the transportation of mining products, B3 waste, and others by using ships operated with diesel engines which are known to be expensive and not environmentally friendly. The configuration consists of a photovoltaic system and an energy storage system as well as land electricity support at the port then optimized by considering solar radiation, temperature, and data component specifications to supply power to the ship so that do not use diesel generators on board. From the calculation results it is known that when the ship is anchored it requires 3,310.34 kWh/day of electrical energy. To meet electricity needs, 3,200 units of PV modules are designed with a power output of 1,216 kW peak and a BESS capacity of 4,064 kWh
Optimization and short-circuit analysis of photovoltaic penetration in off-grid system – A case study in newmont suriname gold mine
Full text linkMining companies are highly dependent on fossil fuels to meet their electricity needs and mining activities such as the use of heavy equipment. Therefore, the greenhouse gas emissions due to burning of fossil fuels have become a major issue related to the impact on the environment due to mining activities. Renewable energy such as Photovoltaic (PV) can be an alternative solution to overcome this problem. This study aims to examine the optimal penetration of Photovoltaic (PV) at Processing Plant Newmont Suriname gold mine. HOMER software is used to design the most optimal Photovoltaic (PV) penetration. ETAP software is used for technical validation through load flow and short-circuit analysis
Analysis of ICONNET fiber optic network improvement in cluster rayon panam at strategic business unit central sumatra PT PLN ICON PLUS
Full text linkOptical fiber is a telecommunications transmission medium that has a large bandwidth and bit rate so that it can meet the needs of today\u27s data services with great reliability and efficiency. Optical fiber applications continue to be broad and have included seabed networks, terrestrial networks, metropolitan and regional scope networks, and small-scale networks. Optical fiber communication systems have 2 factors that affect the quality of network performance, namely internal aspects and external aspects. These internal and external aspects can degrade the performance quality of the optical fiber used and can cause attenuation and other transmission losses. As an effort to prevent sudden and significant deterioration in the quality of a network, it is necessary to try regular maintenance activities such as scheduled fiber optic cable network service quality measurements. These maintenance activities can help ensure network capacity increase decisions. One of the quality of service parameters that is often measured is transmission attenuation and received signal energy (received power). This research examines increasing the bandwidth capacity of PT PLN ICON PLUS in the Central Sumatra region during a network anomaly, namely a slow internet connection in the Rayon Panam Cluster. The sample taken from one of the customers shows the results of measuring the internet speed of 4-5 Mbps only, while the service taken is 10 Mbps. The results of checking on the up-link side to OLT Rayon Panam found that the data output was close to its capacity, which was 940,919,000 bits/sec or 0.9 Gb/sec. Increasing bandwidth capacity is done by moving the OLT port on the up-link side from the gigabit ethernet port to the tengigabit ethernet port, then replacing the SR type SFP with SFP ER and adding fiber optic attenuators so that the speed test results on the customer side have returned to their original appearance., 10 Mbps
Improving fashion design learning outcomes by problem based learning model in Vocational High School
Full text linkThe background of this research problem was the low learning outcomes of students in the cognitive domain of Fashion Design course. This research aims at describing the implementation of the Problem Based Learning model to improve student learning outcomes in the Fashion Design course. The research was conducted at Vocational High School 6 Padang with the method used was Classroom Action Research (CAR). This Classroom Action Research (CAR) was divided into 2 cycles. Each cycle was divided into 4 stages: 1) Planning, 2) Implementation. 3) Observation, 4) Reflection. The research subjects used were students of Grade XI Fashion Design I at Vocational High School 6 Padang, totaling 29 students. Data collection techniques used observation, tests, and documentation. The data analysis technique was carried out by quantitative and qualitative analyzing. In the first cycle, students reached the Minimum Completeness Criteria of learning outcomes as much as 55%. In the second cycle, it increased while 83% of students have reached the Minimum Completeness Criteria. Thus, it can be concluded that the implementation of Fashion Design learning by using the Problem Based Learning Model can improve student learning outcomes in grade XI Fashion Design I at Vocational High School 6 Padang
Evaluation of microstructure high chrome austenitic stainless-steel grade 253MA after creep test at temperature of 700°C
Full text linkHigh Chrome Austenitic Stainless-Steel grade 253 MA is a material that widely used for high temperature. This is due the fact this material has excellent mechanical properties and creep resistance. However, changes in microstructure can occur in long-term use, which will affect the creep resistance (shortened service life of the material). The microstructure of High Chrome Austenitic Stainless-Steel 253 MA creep test specimens was investigated. Creep testing at a temperature of 700 °C with a loading of 150 MPa was carried out. The cold rolling process with 53% reduction in thickness was applied followed by annealing at 900°C, 1000°C, and 1100°C for 3600s to obtain different grain size. Grain size after annealing and after creep test was measured to see the effect of annealing temperature on the grain size of tested steel and to see its effect on creep resistance based on the creep test conducted. Grain size and morphology of the phase after creep test were observed by scanning electron microscope and optical microscop
Development video media using study strategies groups for facial skin care learning not problems beauty cosmetology SMK Negeri 3 Pematang Siantar
Full text linkEducation in Indonesia is constantly evolving. This condition presents a challenge for learning, particularly in the realm of educationwhich functions to provide certain knowledge, insights, skills and expertise. To introduce an innovative teaching paradigm, it is necessary to develop teaching methods and media. In order to achieve innovative teaching goals, educators must have instructional media as a supporting tool or method for conveying material, so as to motivate students and enhance their learning. One of the media that can support the learning process by using visual media as an interactive learning medium is learning videos. The purpose of this learning is to develop and test the feasibility of a valid instructional media video on the No Problem Facial Skin Care competency. The objects of this research inlcude material experts, media experts and students of SMK Negeri 3 Pematang Siantar. The research method is developed by utilizing the R&D (Research & Development). Data collection was carried out using a questionnaire. The research results for the material expert validity test yielded a score of 92.53 percent, while media experts scored 89 percent, and it was determined that the use of interactive video learning media improved student learning outcomes. According to experts, learning video media is ideally suited for use as learning media competencies in No Problem Facial Skin Care
Analysis of technical and economics overhead transmission line 150 kV construction from mine mouth coal fired power plant to external customer substation
Full text linkMine Mouth Steam Coal Fired Power Plant (PLTU) has a capacity of 2x18MW while the power supplied to internal consumers is 3.6MW or around 10% of the total generating capacity (20% of one generating unit). To operate according to its specifications, the load is increased by operating the load bank. The small internal load and use of the loadbank cause the cost of generation to be high. Excess generating capacity can be sold to external consumers outside the mining area, so it is necessary to build one circuit overhead transmission line 150kV as long 48.38km. The construction of overhead transmission line 150kV from the PLTU to the external consumer substation can increase sales of electricity and can replace the loadbank function. This study aims to evaluate the technical feasibility and economic aspects of the construction overhead transmission line 150kV from the PLTU to an external consumer substation. The research method uses financial indicators IRR, NPV and ROI. Overall, the construction of one circuit overhead transmission line 150kV can increase sales of electricity and replace the function of load bank. The NPV value is IDR 1,604,887,094 with an IRR of 12.53%, and ROI of 9.03 years
Implementation of project-based learning for improve students\u27 critical thinking skills in creative product and entrepreneurship subjects
Full text linkThe implementation of monotonous learning that lacks active student participation can contribute to the low critical thinking skills of students. This research aims to enhance students\u27 critical thinking skills through the application of project-based learning (PjBL). The study evaluates the extent to which students\u27 critical thinking skills can be improved through the implementation of PjBL. The research employs a Quasi-Experimental method. The study subjects consist of two groups: the experimental group, which utilizes the PjBL, and the control group, which follows a conventional model. Overall, after conducting prerequisite tests and hypothesis testing, a significant difference in critical thinking scores is observed between the experimental and control groups. Students are provided with the opportunity to exercise their critical thinking skills during the execution of project tasks. Consequently, it can be concluded that the PjBL model positively impacts the essential thinking abilities of 11th-grade machanical engineering students in creative products and entrepreneurship subject
Analysis of production and potential utilization as electricity methane gas air dingin landfill
Full text linkThis study intends to analyze methane gas emissions resulting in landfill procedures. The magnitude of the impact of methane gas emissions on global warming from the waste sector, it is necessary to calculate the potential amount of methane gas emissions of Padang city waste in the Air Dingin Landfill so that it can be used for new energy potential as an alternative energy to replace fossil fuels no longer as a contributor to global warming. In this study, the methodology contains systematic steps in researching to achieve research objectives, namely conducting preliminary studies and literature studies, formulating problems, and setting research objectives as well as how to collect and obtain research data. The result of this study is that the Air DIngin Landfill in Padang City is still processing open dumping, with land that has been operated around 50% of the existing land area. The high operational costs are one of the reasons the sanitary landfill system cannot be done by the Padang City Government. Methane gas produced from 2020 - 2031 in the Air Dingin Landfill is produced from scenario 1 (waste directly landfilled) which is 43,289 gigagrams of CH4 or 43,289 tons of CH4 emissions. CH4 emission scenario 2 (waste reduction by waste pickers in landfill) produced 43,267 gigagrams or 43,267 tons of CH4. CH4 emission scenario 3 (Reduction of waste at source, in the region, and in landfill) produced 40,944 gigagrams CH 4 or 40,944 tons of CH4. After converting methane gas into electrical energy, the potential electricity in scenario 1 is 84.15 megawatts, scenario 2 is 84.10 megawatts and scenario 3 is 79.59 megawatts in 2031