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INVOTEK: Jurnal Inovasi Vokasional dan Teknologi
Published by Universitas Negeri Padang
ISSN : 14113414     EISSN : 25499815     DOI : -
Core Subject : Science, Engineering,
Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Transportation
INVOTEK: Jurnal Inovasi Vokasional dan Teknologi is a double blind peer-reviewed journal for Technical, Vocasional, Education and Training (VET) related research. This journal provides full open access to its content on the principle that making research freely available to the science community and the public supports a greater global exchange of knowledge and the further development of expertise in the field of Vocational Education and Training (understood in a wide sense and also known as e.g. TVET Technical Vocational Education and Training, Professional Education and Training, Career and Technical Education, Workforce Education).
Arjuna Subject : Umum - Umum
Articles 230 Documents
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Analysis Variations of Riser in Sand Casting for Scrap Aluminum on Hardness Values Zainal Abadi; Andre Kurniawan; Andril Arafat; Nur Ichsan Abdillah; Daffa Raihan Senthot
invotek Vol 21 No 3 (2021): INVOTEK: Jurnal Inovasi Vokasional dan Teknologi
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/invotek.v21i3.940

Abstract

Abstract In this study, we will discuss the process of casting used aluminum metal. Used aluminum is one of the industrial wastes that can be converted into products using the casting method. This study aims to obtain a good casting material with good hardness values ​​and minimal defects. The research will focus on the results of castings by analyzing the visuals and hardness values ​​of the specimens. The research design is a pre-experimental type of One-Shot Case Study by conducting treatments whose results will be directly observed and analyzed descriptively. The treatment given is to increase the number of risers in recycled aluminum castings. Variations in the number of risers are 1 riser, 2 riser, and 3 riser. Each variation has 3 specimens, so there are 9 specimens in the study. The data from the test results contained a fairly large porosity value for each riser variation. The hardness value that has been tested using the Rockwell hardness tester obtained the highest hardness value occurs in the 2 riser variation, namely 27.69 HRA and the lowest hardness value occurs in the 3 riser variation, namely 21.56 HRA. Thus, for casting used aluminum with a casting pattern as in this study, it is best to use 2 risers.
Foreshock and aftershock earthquakes characteristic for subduction (Case study: Aceh earthquake in 2004 and Tohoku earthquake, Japan 2011) Rusnardi Rahmat Putra; Asri Atmojo
invotek Vol 21 No 3 (2021): INVOTEK: Jurnal Inovasi Vokasional dan Teknologi
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/invotek.v21i3.941

Abstract

Aceh earthquake occurred in 2004 with magnitude 8.8Mw, the epicenter was located at latitude 3.295 and longitude 95.982 and Tohoku earthquake occurred in 2011 with magnitude 9.0Mw and located at latitude 38.29 and longitude 142.373. The both earthquakes have similar earthquake source mechanism such as the epicenter located in subduction zone, plate movement type. The research aims to determine the distribution of earthquake events before (foreshock) and after (aftershock) the main shock. Earthquake event datas were obtained from several earthquake databases, such as USGS and BMKG. The earthquake events from database sources are grouped based on the time of occurrence, radius, and magnitude. The result for foreshock shows that the number of earthquake events for foreshock within two years at a radius of 150 km with a magnitude M> 4 as many as 12 earthquake events and 129 earthquake events for Aceh and Tohoku respectively, The result for aftershocks are 119 and 1576 for Aceh and Tohoku respectively.
Improved learning outcomes of CNC programming through Augmented Reality jobsheet learning media Febri Prasetya; Bayu Rahmadani Fajri; Budi Syahri; Fadhli Ranuharja; Aprilla Fortuna; Amri Ramadhan
invotek Vol 21 No 3 (2021): INVOTEK: Jurnal Inovasi Vokasional dan Teknologi
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/invotek.v21i3.957

Abstract

This study aims to determine: (1) the differences in learning outcomes of students who are taught using Augmented Reality (AR) jobsheet learning media with students taught using conventional learning media, (2) differences in learning outcomes of highly motivated students and low motivated students, and (3) the interaction between Project Based Learning learning methods and learning motivation in influencing learning outcomes. This research is a quasi-experimental research with a population of 64 people, the sample was taken as many as 32 people using the cluster random sampling method. Data were collected using a questionnaire for learning motivation and tests for learning outcomes. The data analysis technique used is descriptive analysis and two-way analysis of variance (Two Ways Anova). The research results found: 1) there are differences in student learning outcomes taught by the Project Based Learning learning method compared to student learning outcomes taught conventionally with Fcount of 7.98 (2) there are differences in learning outcomes of highly motivated students with low motivated students with Fcount 34.40, and (3) there is no learning interaction between learning methods and learning motivation in influencing student learning outcomes with Fcount 3.19
Heutagogy: Empirical study on conceptual understanding, self-learning awareness and learning outcomes Rinaldi Rinaldi; Deni Wahyuni; Isa Hamzah
invotek Vol 22 No 1 (2022): INVOTEK: Jurnal Inovasi Vokasional dan Teknologi
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/invotek.v22i1.986

Abstract

Some problems are attached by the online learning system such as low self-learning awareness and conceptual understanding. One of the learning approaches is the concept of heutagogy which is the development of andragogy approach. Self-learning awareness and conceptual understanding are needed either online or offline learning system, so it can improve student learning outcomes in all subjects. However, previous studies on the effect of the heutagogy approach on self-learning awareness and conceptual understanding as well as relate it to increase learning outcomes is still limited. Likewise with research on how the influence of self-learning awareness, conceptual understanding and their interaction on increasing learning outcomes has not been found. As novelty, this study aims to determine the effect of the heutagogy approach on increasing conceptual understanding and self-learning awareness and the interaction effect of self-learning awareness and conceptual understanding on course learning outcomes. This study is quasi-experiment. A total of 250 first-year students were randomly selected as samples in the pre-test and post-test. Data were collected by distributing a set of questionnaires and a set of exams via Google forms and were analyzed using Statistical Package for Social Science 23.0 (SPSS v 23.0) and SmartPLS 3.0. Findings showed that the heutagogy approach has possitive and significant effect to increase conceptual understanding and self-learning awareness. Self-learning awareness has a positive and significant effect and also mediates the effect of conceptual understanding on learning outcomes. Heutagogy approach increase conceptual understanding (8.79%), self-learning awareness (10.68%), and learning outcomes (6.70%) compared with traditional method.
Structural assessment of building Elementary School 28 Air Tawar Timur Padang Prima Yane Putri; Candra Candra
invotek Vol 22 No 1 (2022): INVOTEK: Jurnal Inovasi Vokasional dan Teknologi
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/invotek.v22i1.920

Abstract

Abstract ˗˗The State Elementary School 28 Air Tawar Timur Padang is an Inpres School which was built in 1982. The current condition of the school building is damaged, such as cracks, loose concrete (spalling), deflection and shaking floors. This study aims to provide recommendations for repair or maintenance of the school building. The assessment method used in this study is the Non Destructive Test (NDT) method. Testing the compressive strength of concrete using a Schmidt Rebound Hammer. To see the amount of reinforcing steel, diameter of reinforcing steel and dimensions of structural elements using a Rebar Locator, Caliper, and a meter. Testing the building geometry and deflection floor plates using Total Station and Laser Measurement. The building structure was analyzed using the SAP2000 program. The results of the concrete compressive strength test (fc ') are on average 20.40 MPa on the column, 22.23 MPa on the beam, and 23.43 MPa on the floor plate. The results of visual observations of the building are categorized as severely damaged with the proportion of damage above 20%. Where the proportion level of column damage is 32%, beams 20.35%, and the floor court is 65%. The results of the building structure evaluation show that all elements are categorized as unsafe except Beams 3, Beams 4, and Column 2. The maximum deflection of the floor as high as 73 mm exceeds the allowable permit, which is 18.9 mm. The recommendation for repair of the school is building renovation.
Analysis of student’s learning outcomes test questions Department of Automotive Engineering FT UNP Hendra Dani Saputra; Sartika Anori; Donny Fernandez; Dedi Setiawan
invotek Vol 22 No 1 (2022): INVOTEK: Jurnal Inovasi Vokasional dan Teknologi
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/invotek.v22i1.964

Abstract

This study is a follow-up to the results of previous studies, which stated that e-learning media did not have a significant effect on improving learning outcomes. One way of measuring learning outcomes is by presenting test questions on E-Learning media. So that a good test item will be able to provide a good measurement of learning outcomes. This research is included in quantitative descriptive research. The research aims to see the level of validity, reliability, difficulty index and Different power test questions for students of the Department of Automotive Engineering, FT UNP. The research method presenting test items in the form of multiple choice. Then proceed with quantitative analysis of the test items. The results of the analysis will provide an overview of the criteria for valid items of 84% and the reliability index of the questions in the criteria of 0.899. The results of the test difficulty index analysis, that 80% of the test questions are included in the category of good test items. As many as 20% of the test questions including the category are too easy. The results of the analysis of the different power of the test items are 28% including the bad classification. Classification test questions are sufficient at 40%. Classification of different test items is good at 32%. The category of good test items is a category of test items with sufficient and good classification.
Numerical prediction of rotary-kiln foundation temperature at an early age Adek Tasri
invotek Vol 22 No 1 (2022): INVOTEK: Jurnal Inovasi Vokasional dan Teknologi
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/invotek.v22i1.1008

Abstract

The hydration heat confined to the core of the mass concrete during the hydration reaction causes a temperature rise and irregular temperature distribution in the concrete. High temperatures in concrete cause Delay Ettringite Formation (DEF) that cause damage several years after pouring, especially if the concrete is in an acidic environment. The uneven temperature distribution causes thermal stresses that can initiate cracks in the concrete surface. This article discusses a prediction of temperature distribution inside a mass concrete used as a rotary kiln foundation. We measure the heat of hydration of the concrete sample using an adiabatic calorie meter and derive the heat of hydration equation from the measurement data. The hydration heat was used in numerical calculations to obtain the temperature distribution, maximal temperature and temperature differential. The numerical calculation shows that the maximum foundation temperature was 64.01 0C. This temperature is still below the limit temperature for the occurrence of Delayed Ettringite Formation (DEF). The core region has the highest temperature, while the surfaces have the lowest temperature. The difference between the highest and lowest temperatures is 37.40 0C. However, the temperature differential exceeds the safe limit, 20 0C, so heat treatment to prevent cracking needs to be done.
Analysis of Contractor's Knowledge Level about Construction Safety Management System Budget Plan Components (Case Study: Construction Project in Padang City) Prima Zola; Viola Paramita Susanti; M. Giatman; Annisa Prita Melinda; Fitra Rifwan
invotek Vol 22 No 1 (2022): INVOTEK: Jurnal Inovasi Vokasional dan Teknologi
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/invotek.v22i1.954

Abstract

Work accident prevention is cheaper than responding responsively after an accident. Common problems are weakness and a lack of predicted levels of risk for a job that could potentially be a work accident. Risk Control is undoubtedly something that must be designed before the work is done. This control must be supported by costs to run a Construction Safety Management System (SMKK). The initial observations and references that have been conducted and collected indicate the problem that the financing does not appear in the Budget Plan of the contractors in several construction projects when participating in the tender auction at the research site, namely: The City of Padang. There are limitations of information media, socialization, and implementation instructions become challenges in running it. This fundamental problem gave rise to an idea to carry out research. This research has been conducted to explore the problem of the level of knowledge of contractors about the financing of smkk. The data in this study was obtained by survey, in detail, disseminating questionnaires online to samples, namely: contractors in the city of Padang. The questionnaire has been analyzed, resulted the level of knowledge of this contractor is quite good in the level of knowledge about the components of the budget plan of SMKK. There is no problem with the contractor's knowledge related to the budget plan, except: readiness and planning for the system of budget.
A Finite Element Analysis of Structural Strength of Ferry Ro-Ro’s Car Deck M. Uswah Pawara; Alamsyah Alamsyah; Rodlian Jamal Ikhwani; Ade Ray Siahaan; Andi Mursyid Nugraha Arifuddin
invotek Vol 22 No 1 (2022): INVOTEK: Jurnal Inovasi Vokasional dan Teknologi
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/invotek.v22i1.959

Abstract

Ferry Ro-Ro is a type of ship used to carry passengers and vehicles. This ship has several decks such as navigation decks, passenger decks, and car decks. The car deck is subject to a heavy load as it should accommodate vehicle loads. This study aims to conduct a finite element analysis to determine the stress and deformation experienced on the car deck of the Ferry Ro-Ro and determine the safety factor based on BKI (Indonesian Classification Bureau). The method used in this study is the Finite Element Method (FEM) which has been applied in the finite element based-applications namely Ansys Workhbench. The simulations are carried out using the software by varying the thickness of the car deck’s plate, the plate is subjected to pressure loads which are car loads accommodated by the car deck. Moreover, the fixed support is applied in the deck during the simulation. Based on the simulation results of variations of 90, 100, and 110% plate thickness. It is obtained that the smallest plate experienced maximum stress and the obtained safety factor of all plate thickness variations was satisfied the BKI Standard.
Analysis of Hardness on the Tapping Knife of Rubber Plants Made of Medium Carbon Steel Resulting from Quenching Process with Different Cooling Mediums Niko Adima Brawira; Hendri Nurdin; Remon Lapisa; Budi Syahri
invotek Vol 22 No 2 (2022): INVOTEK: Jurnal Inovasi Vokasional dan Teknologi
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/invotek.v22i2.1017

Abstract

The quenching process carried out by the Blacksmith was still simple and used regular water cooling. This results in the knife not having a good value of hardness. This study aimed to analyze the effects of quenching with different cooling media on the hardness of the JIS SUP 9 knife from Blacksmith. The research method used an experimental method with research objects made of carbon steel per leaf or the JIS SUP 9 which was given hardening with a temperature of 800 ° C with a holding time of 30 minutes then quenching with water cooling media and oil. The data analysis found that the knife quenching with water had an average hardness of 295.6 HVN, Oil had an average hardness of 720.7 HVN, and control specimens with a hardness of 256.6 HVN. Thus, the medium quenching oil has the highest value of hardness, while the oil quenching media also has a good hardness value with no acceleration of the process of expansion. From the results of the study, the authors recommend in the quenching process use of oil cooling media, as well as adding variations of cooling media to get a better hardness value.

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