Jurnal Pendidikan Teknologi Kejuruan
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Total Suspended Particulate (TSP) simulation using the gaussian dispersion model
Full text linkAir pollution is one of the most dangerous and worrying. One of the causes of air pollution is dust or Total Suspended Particulate (TSP), namely particles with a diameter of <100 μm. The Total Suspended Particulate causes visual distrurbances and respiratory disorders such as URTI (Upper Respiratory Tract Infection). According to data from Badan Pusat Statistik Kota Padang in 2018, URTI represents the highest complaint in the district Lubuk Begalung as many as 5,534 cases (28%). In the district has industrial and transportation activities which are a source of air pollution. However, in there haven’t real time monitoring of air pollution, so it is necessary to carry out air pollution simulations. This study aims to determine the concentration of TSP ambient air pollution and to analyze the distribution air pollutant in the Lubuk Begalung District, Padang City. The research method used a quantitative, where the emission inventory and meteorological data used the Gauss dispersion model and surver 15 software. The maximum TSP from measurement and modeling results was 113.42 µg/m3 and 27.16 µg/m3. This result explain about the TSP concentration is still below the National BMUA in PP RI No. 41 of 1999, which is 230 µg/m3 (still in good condition). This is different from previous studies because this study only considers sources of industrial emissions without other sources of pollution. The result of the TSP distribution is moving increasingly towards the Southwest from the emission source and reaches a maximum concentration at the coordinate point (-0.98103 oS, 100.34567 oE), according to the dominant wind direction
Waste motor engine oil – the influence in warm mix asphalt
Full text linkEmploying Hot Mix Asphalt (HMA) technology for asphalt pavement construction results in the emission of greenhouse gases and other harmful pollutants, contributing to significant air pollution due to extensive energy consumption. Consequently, the adoption of Warm Mix Asphalt (WMA) is recommended, given its potential for enhanced energy efficiency and reduced emissions due to lower mixing and production temperatures compared to HMA. This research delves into the impact of incorporating waste motor engine oil (WMEO) as a bitumen modifier in warm mix asphalt. The investigation involved adding WMEO at various percentages, specifically 0%, 3%, 4%, and 5% based on the weight of bitumen. The study assessed the performance of the samples in terms of penetration, softening point, stability, flow, and stiffness. The findings revealed that the incorporation of WMEO in warm mix asphalt led to a substantial improvement in penetration and softening point. Moreover, the results indicated that incorporating WMEO as a bitumen modifier could enhance the performance of WMA in terms of stability, flow, and stiffness
Development of applied technology textbook based on project-based learning from student’s regional potentials
Full text linkVocational education fully contributes to the development of Human Resources through the graduates it produces. One strategy to improve student skills in the field of appropriate technology is to apply project-based learning from regional potentials. This study aims to produce valid, practical, and effective textbooks as a tool to maximize project task-based learning from regional potential. This research was conducted using research and development methods using the ADDIE model. The validity of the textbook was obtained from the expert assessment. The data on the practicality of the textbooks were obtained from the opinion of the lecturer in charge of the course and from 30 students who took the Applied Technology Engineering course. The effectiveness of textbooks in terms of improving learning outcomes (pre-test and post-test). The results obtained from this research and development are that the textbooks are declared valid from the material and media aspects based on the assessment of experts, which are 88% and 84%, respectively. The textbooks were declared practical, the result of the lecturer\u27s response was 86% and the student\u27s response was 82.86%. Judging from its effectiveness, the textbook achieved a score on the Paired T-Test of 0.000 which is smaller than 0.005 which indicates a significant difference between the pre-test and post-test or there is an influence on the difference in treatment given to research subjects
Failure analysis of ICDP work roll of hot strip mill case study of shell-core interface spalling
Full text linkThe failure of the roll during the rolling process causes cobble to lose production time for several hours. Investigations include visual inspection, lltrasonic test, chemical analysis, metallography, and hardness measurement. Stand finishing F1-F4 uses High Chrome (HCr) material type, while Stand F5-F6 uses ICDP material type. Spalling work roll occurs on stand F5 with Roll Top position. Roll was chipped between shell and core with an exfoliation percentage of 30% of the roll surface area. Visually, the chipped part looks smooth and even. Thus no typical sign of fatigue or brittle failure was observed. The chemical composition of the roll conforms to the standard. Roll surface hardness that does not experience spalling follows the standard. The metallography analysis found micro-cracks in the spalled samples and inclusions in the form of scale in the shell-core interface. Based on the study, it can be concluded that the spalling roll is caused by poor bonding of the shell and core on the roll
The effect of e-service quality on purchase decisions with E-WOM as a moderating variable on 4-star hotels in West Sumatra
Full text linkThis research is based on changes in consumer behavior in deciding to purchase hotel room services in West Sumatra, post-covid-19 consumer behavior has an impact on hoteliers in determining marketing strategies, this study aims to see the relationship between variables, namely E-Service Quality on purchasing decisions and see the effect of the E-wom variable as a moderator on purchasing decisions. This research was conducted in West Sumatra with a sample of 120 hotel guests, using a purposive sampling technique, where the sample was determined by the criteria of having stayed at a hotel and making hotel room reservations online. This study uses the help of PLS techniques to determine the inner and outer variables, where the variables measured are E-Service quality, Purchase Decision, E-WOM as a moderating variable. The results show that E-Service Quality has a significant positive effect on purchasing decisions and E-WOM moderates E-Service quality significantly positive on purchasing decisions
Health index analysis on asset management and the influence of electricity and environmental safety aspects on overhead transmission line 150 kV Anyer – Asahimas
Full text linkThe availability and reliability of electrical energy has become the backbone of society, so periodic maintenance needs to be carried out to avoid short breakdowns and technical malfunctions as well as to improve electrical and environmental safety. Overhead transmission line is an important part of the transmission network and their health status is an important foundation for ensuring the reliable supply of electricity to the power grid. The health index (HI) is a value that reflects the health status of high-voltage transmission lines obtained by combining the normalization of component ratings on certain parameters and calculation methods. This study shows that the condition of assets, electricity and the environment have an effect on determining the soundness index of the Anyer-Asahimas 150 kV overhead transmission line and can be a guide for its maintenance. The final health index value shows 92.8% meaning that the transmission is not only safe in terms of equipment but also safe in terms of electrical and environmental safety aspects
Suitcase security system using Android and GPS
Full text linkTechnological progress is something that cannot be avoided in line with the development of science. Technology provides many benefits because technology is present to facilitate human work. One of the technological advances is the presence of airplanes. To go wherever humans are not restricted by distance and time. Generally, people will use a suitcase to store their luggage when they travel because it is easier to carry. But the theft of items in the suitcase is rampant. For this reason, a security system can be made that can inform the owner that the suitcase has been forcibly opened. The PIR sensor installed in the suitcase will detect if there is movement and temperature of the human body heat in the suitcase. Then GSM SIM900A will send a notification to the owner and the buzzer will sound. If the suitcase has been stolen and taken away then we can see the location of the suitcase in the application that has been made with coordinates obtained from the GPS module installed in the suitcase. In addition, we can activate or deactivate the sensor through an application that has been made with the aim that when the owner opens the suitcase there will be no notification that the suitcase has been forced open and the buzzer will not ring
The effectiveness of learning media on the outcome of computer and basic network of vocational students
Full text linkLearning media is a tool that can help the teaching and learning process so that the meaning of the message conveyed becomes clearer and the goals of education or learning can be achieved effectively and efficiently. The results given to students in the form of an assessment after following the learning process with the value of knowledge, attitudes, skills in students with changes in behavior can also be called student learning outcomes. One source of student learning to obtain messages and information provided by the teacher so that learning materials can be further improved and form knowledge for students is using Learning Media. In this study, researchers used research and development (R&D) methods, and the ADDIE development model. This interactive learning media is designed using the Lectora application. The results of this study are the effectiveness of the media using time series results of student learning mastery increased by 20% effectively to improve student learning outcomes through tests. A score of 0.52 was obtained in the medium category
Evaluation of E-learning at the Faculty of Engineering, Universitas Negeri Padang
Full text linkOnline learning can use an e-learning platform, e-learning content must be ideal and in accordance with the evaluation of the use of e-learning content. However, the gap that occurs is that e-learning content has never been started at Padang State University (UNP). The problems experienced by lecturers are not using content optimally, only using uploaded material, while content related to how to present material, learning methods in the use of e-learning and other content is not used. The purpose of this research is to make improvements to the implementation of e-learning in the UNP environment. The method used is a mixed method with quantitative and qualitative research, CIPP evaluation model, data collection using questionnaires. Based on the keywords from the CIPP evaluation results; 1) Context such as Principles, Goals, Environment, Needs. 2). Inputs such as e-learning delivery format, human resources (HR), User-friendly E-learning interface and service quality. 3) product category, namely Lecturer Competence. 4). Category of Lecturer Interaction Process, Teaching Method. The results of the survey obtained in Contexs have an average of 77.23, for input the average is 93.99, then the average process is 69.73, and the product is 68.25. So that it can provide recommendations for evaluating the implementation of e-learning by considering the process in the interaction section, on the product aspect of learning outcomes, on the input aspect the value is very good, then the component dimensions need to be improved.Online learning can use an e-learning platform, e-learning content must be ideal and in accordance with the evaluation of the use of e-learning content. However, the gap that occurs is that e-learning content has never been started at Padang State University (UNP). The problems experienced by lecturers are not using content optimally, only using uploaded material, while content related to how to present material, learning methods in the use of e-learning and other content is not used. The purpose of this research is to make improvements to the implementation of e-learning in the UNP environment. The method used is a mixed method with quantitative and qualitative research, CIPP evaluation model, data collection using questionnaires. Based on the keywords from the CIPP evaluation results; 1) Context such as Principles, Goals, Environment, Needs. 2). Inputs such as e-learning delivery format, human resources (HR), User-friendly E-learning interface and service quality. 3) product category, namely Lecturer Competence. 4). Category of Lecturer Interaction Process, Teaching Method. The results of the survey obtained in Contexs have an average of 77.23, for input the average is 93.99, then the average process is 69.73, and the product is 68.25. So that it can provide recommendations for evaluating the implementation of e-learning by considering the process in the interaction section, on the product aspect of learning outcomes, on the input aspect the value is very good, then the component dimensions need to be improved
Adsorbent-based biogas quality analysis through purification process
Full text linkBiogas is a raw material utilized to produced biogas. Biogas is renewable energy source produced by the anaerobic activity of organic matter through the fermentation process. Quality of biogas is determined by its main composition, such as methane (CH4). In addition, the composition of biogas also contains impurities such as unburnt carbon dioxide (CO2) so that it reduces the heating value, hydrogen sulfide (H2S) and water vapor (H2O) which are corrosive as well as Nitrogen (N2). Adsorption method on the impurity compositions can be used to improve biogas quality. This research used a column purifier containing four adsorbents in the form of calcium hydroxide Ca(OH)2, iron gram (Fe2(O3)), zeolite and activated carbon with three volume variations 600 cm3, 900 cm3 and 1200 cm3. The results of biogas testing using gas chromatography showed that the best quality obtained from the 1200 cm3 volume of adsorbent. Methane content was increased up to 17.985% and the impurity gases were decreased, such as carbon dioxide in as much as 18.15%, hydrogen sulfide and water vapor in as much as 0.182%. The heat produced by unpurified biogas was 1518.312 kJ/m3 and the highest heating value after purification was 2108.22 kJ/m3. The biogas combustion resulted in a dominant blue flame color.The most optimum effectiveness of the technology resulted in an increase of the methane content up to 64.275%. Based on this research, the utilization of column purifier with the adsorption method was able to improve the quality of bioga