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International Journal of Research in Vocational Studies (IJRVOCAS)
Published by Yayasan Ghalih Pelopor Pendidikan
ISSN : 27770168     EISSN : 27770141     DOI : https://doi.org/10.53893/ijrvocas.v1i1
Core Subject : Economy, Science, Education, Social, Engineering,
Aerospace Engineering Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other
The International Journal of Research in Vocational Studies (IJRVOCAS) is a double-blind peer-reviewed journal. This journal provides full open access to its content on the principle that making research freely and independently 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 (VET). IJRVOCAS is since the beginning independent from any non-scientific third-party funding. The establishment of the journal was supported between 2015 and 2016 with grants from the Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation). All members of IJRVOCAS work on an honorary basis. The journal is hosted by Ghalih Publishing and the publishing house of the Ghalih Academic. Scope IJRVOCAS covers all topics of VET-related research from pre-vocational education (PVE), initial vocational education and training (IVET) and career and technical education (CTE) to workforce education (WE), human resource development (HRD), professional education and training (PET) and continuing vocational education and training (CVET).
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 221 Documents
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Study of Residual Soil Permeability Coefficient Post Addition of Coal Fly Ash Tarigan, Rasdinanta; Parman; Harahap, Muhammad Ari Subhan
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 3 No. 4 (2024): IJRVOCAS - Special Issues - International Conference on Science, Technology and
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v3i4.103

Abstract

Residual soil is soil that is often used as barrier cover soil at the closure of B3 waste storage facilities. This is because the shear strength of the soil is quite good. The minimum value of the soil permeability coefficient (k) for barrier hoods at the closure of B3 waste storage facilities is 10-7 cm/sec. Many residual soils have a soil permeability coefficient (k) of less than 10-7 cm/sec. Because the dominant compound in coal fly ash is silica, mixing this fly ash with residual soil can reduce the value of the soil permeability coefficient (k) and is also expected to increase the shear strength value of the soil. In this study, residual soil samples were mixed with fly ash at 5%, 10%, 15%, 25% and 35% of the dry weight of the soil. This research aims to determine the effect of adding fly ash on the parameters of dry density, shear strength and soil permeability. The tests carried out were standard proctor testing, direct shear test, and Falling-Head permeability testing. The residual soil used in this research came from Hamlet I, Bintang Meriah Village, Pancur Batu District, Deli Serdang Regency. Based on standard proctor testing, the maximum density (gd max) of original soil is 1,410 gr/cm3. The largest maximum density (gd max) was obtained when adding  15% fly ash, namely 1.471 gr/cm3. In the direct shear test, the original soil cohesion value was 0.024 kg/cm² with an internal shear angle of 37.96º. In the variation of adding 15% fly ash, the cohesion value was 0.131 kg/cm² with an internal friction angle of 53.08º. Based on the Falling-Head permeability test, the original soil permeability coefficient value was 1.98 x 10-6 cm/s. The permeability coefficient value for variations in adding 15% fly ash was obtained at 8.02 x 10-8 cm/s.
Decreasing pH, COD and TSS of Domestic Liquid Waste Using Photocatalysis TiO2 (Titanium Dioxide) Marhadi; Adriansyah, Endi; Herawati, Peppy; Suzana, Asih; Pratama, Aulia Intan
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 3 No. 2 (2023): IJRVOCAS - August
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v3i2.201

Abstract

Domestic waste comes from households that must be treated. Based on the Minister of Environment and Forestry Regulation Number P.68/Minister Environment and Forestry-Secretary General/2016 concerning Domestic Wastewater Quality Standards, the government has set a maximum limit for waste water that can be disposed of to the environment or receiving water bodies. includes pH, TSS and COD parameters. This is useful for overcoming the problem of environmental pollution caused by wastewater. Waste water that is not managed properly will have an impact on human health. environmental pollution is harmful to humans. Domestic sewage treatment using a titanium dioxide photocatalyst shows the results of testing the pH value on domestic waste as shown below, showing that overall the concentration of parameters has increased the pH value decrease 90% from acidic to normal with the best pH value with a value of 6.57 at a contact time of 210 minutes of mass catalyst 2.5 grams. Parameter concentration decreased TSS value from initial value of 157 mg/L to normal with the best TSS value of 94 mg/L at contact time of 210 minutes with catalyst mass of 2.5 grams. COD value at contact time of 210 minutes with a mass of 2.5 grams of catalyst with a value of 2861 mg/L. COD value affects the time and mass of the catalyst (1). a decrease of 40.1% where the TSS value meets the quality standard, and the COD value has decreased by 31%. Addition of further processing to get a better COD.
Real-Time Changes of Heart Rhythm Using MATLAB Pratama, Destra Andika; Anisah, Masayu; Marlianda, Septi Adila
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 3 No. 2 (2023): IJRVOCAS - August
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v3i2.202

Abstract

Highest mortality from cardiovascular disease (CVD) in 2019: 17.9 million people died worldwide, accounting for 32% of all deaths, 85% of which were due to heart attack and stroke. In Indonesia, 651,481 people die from cardiovascular disease each year, including 331,349 from stroke, 245,343 from coronary heart disease, and 50,620 from hypertension and other cardiovascular diseases. Disturbance of changes in heart rhythm is a condition when the heart's electrical activity is irregular, it can be faster or slower than usual. This disorder is closely related to cardiovascular diseases such as hypertension, heart failure, valvular heart disease, and coronary artery disease. Changes in heart rhythm are usually not dangerous, but if the heartbeat starts to feel abnormal, it can be fatal and cause sudden death. Changes in heart rhythm can be detected using an electrocardiogram, often called an EKG. The function of the EKG is to record information about the state of the heart using electrodes attached to the body. An EKG examination usually has to be done in a hospital to find out the disease the patient is suffering from. This study implements an ECG signal real-time monitoring and processing system using AD8232 sensor module and will display the resulting ECG signal in MATLAB software. This test will be monitored using Simulink MATLAB on the MATLAB R2022b software. Testing the ECG signal studied there were two activities, namely normal activity and after exercising for five minutes. The test was carried out in a sitting position using a 21 years old woman. The results obtained from the system are made using the AD8232 sensor module has been successfully implemented using R peak detection to generate real-time heart rate. It was found that the heart rate varies between 85 to 90 beats per minute during normal activity. Meanwhile, the heart rate after five minutes of exercise reaches 107 to 111 beats per minute. From this heartbeat, we can assume that the heart is functioning normally.
Implementation of the Internet of Things for Monitoring and Protecting Hydrogen Production in Dry Cell HHO Generators Robby Setiadi; Taqwa, Ahmad; Bow, Yohandri
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 3 No. 2 (2023): IJRVOCAS - August
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v3i2.203

Abstract

In the last few decades, researchers have been conducting various studies in search of alternative energy sources to reduce dependence on fossil fuels and anticipate future energy scarcity. One such alternative energy is hydrogen, which can be obtained through various methods, including electrolysis of water. Hydrogen possesses the characteristics of being flammable, odorless, colorless, and tasteless, necessitating the development of a rigorous monitoring and protection system to mitigate potential hazards. In this study, a monitoring and protection system was designed for the operation of an electrolyzer using a Dry Cell type HHO Generator. The system employs the concept of the Internet of Things, where data is connected through the internet network. The data received includes hydrogen concentration readings, electrolyzer operation automation, electrolyzer operating status, and hydrogen gas leak detection in the system. The research results obtained showed that the higher the concentration of electrolyte and the voltage supplied to the electrolysis process, the faster the production of hydrogen gas is accelerated, accompanied by an increase in temperature. If a leakage occurs in a system, the occurrence of the fire triangle will be faster when the concentration of electrolyte and the voltage supplied are greater.
CO2 and H2S Absorption in Tofu Liquid Waste Biogas using Packed Bed Scrubber with Variation of MEA Concentration and Flow Rate Putra, Aan Ade; Kalsum, Leila; Hasan, Abu
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 3 No. 2 (2023): IJRVOCAS - August
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v3i2.204

Abstract

Biogas technology has become an alternative fuel that is often used in Indonesia. One of the raw materials for biogas that has the potential and is easy to obtain is waste from the tofu industry. Liquid waste still contains a lot of organic elements. The organic materials contained in the exhaust of the tofu industry are generally very high. The gases commonly found in tofu waste are nitrogen gas (N2), oxygen (O2), hydrogen sulfide (H2S), ammonia (NH3), carbon dioxide (CO2) and methane (CH4). These gases come from the decomposition of organic materials contained in wastewater. So that biogas produced from tofu liquid waste still contains CO2 and H2S gases which are quite high. Therefore, in this study the process of purification or refining of biogas products will be carried out using the absorption method through an absorber column using monoethanolamine (MEA) solution as a chemical absorbent through a 8 mm packed bed scrubber. The results showed that the best biogas flow rate in the purification process which produced the highest CH4 concentration of 95.12% was 40% MEA concentration and 0.8 L/min flow rate. The effect of MEA concentration on biogas purification causes the concentration of CO2 and H2S in the purified biogas to decrease as the MEA concentration increases. The best combination of 0.8 L/min biogas flow rate and 10 mm packing area reduces CO2 and H2S concentrations to 1.88% and 0 ppm.
The Comparison of Hydrogen Purity on Brown’s Gas Using Dry Cell Electrolyzer with/without Polyvinyl Alcohol (PVA) Separator Membrane Rahmadina, Nisa; Bow, Yohandri; Yusi, Syahirman
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 3 No. 2 (2023): IJRVOCAS - August
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v3i2.205

Abstract

Global environmental issues that demand good air quality have encouraged various energy sources to develop environmentally friendly energy. Brown’s Gas is produced by using an electrolysis system to separate water into Hydrogen (H2) and Oxygen (O2) gas. The dry cell is an electrolyzer that is widely used for both small and large-scale hydrogen production systems. A dry cell electrolyzer was designed with 12 stages of 316 stainless steel with Polyvinyl Alcohol as a polymer membrane to prevent mixing H2 and O2 to get a high percentage of hydrogen purity. This study compares hydrogen purity on Brown’s gas using a dry cell electrolyzer with PVA with/without a PVA separator membrane. The result shows that the PVA membrane significantly impacted hydrogen purity. The hydrogen purity on Brown’s gas without PVA membrane for KOH, NaOH, KCl, and Seawater was 58.37%, 56.42 %, 50.16%, and 55.22 %. Compared to using the membrane was 78.32%, 77.80%, 63.16%, and 74.0 %, with the highest hydrogen obtained was KOH electrolyte.
Design and Stress Analysis of the Prototype Bapro-1 Car Chase Effendi, Sairul; Friatinia, Della Dwi; Arnoldi, Dwi; Jaya, Rangga Danar
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 3 No. 2 (2023): IJRVOCAS - August
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v3i2.206

Abstract

BAPRO-1 is a type of prototype vehicle made by the SMES (Sriwijaya Mechanical Engineering Squad) team. This car was made to be contested in the KMHE (Energy Saving Car Contest) event which has the aim of creating more effective motorized vehicles, both in terms of vehicle design, quality of components and so on which can improve fuel efficiency in these vehicles. This article shows the stress analysis of the BAPRO-1 vehicle chassis using the Autodesk Inventor application. The chassis tested uses aluminum 6061 and stainless-steel. The test is carried out with the assumption of a static load, namely when the car is stationary. The purpose of writing this article is to determine the value of safety, deflection, and the Von Misses number. This study uses the Autodesk Inventor software to create 3D images.
Internet of Things (IoT) Based Temperature Monitoring System on The Low Voltage Sub-Distribution Panel (LVSDP) Busbar Carlos R, Sitompul; Rumiasih; Indrawasih; Albianto, M. Dwi
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 3 No. 2 (2023): IJRVOCAS - August
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v3i2.207

Abstract

In this study, a tool is designed to monitor the temperature on the busbar of the Low Voltage Sub Distribution Panel (LVSDP) based on the Internet of Things. This tool uses the internet network to receive data from a sensor in real-time. The tool in this study is designed to detect the heat generated by the busbars of each phase installed in the LVSDP. Real-time display on the smartphone provides notification if the temperature on the busbar has exceeded the preset set point. To monitor the temperature on the busbar, real-time monitoring is needed which will make it more convenient for technicians to carry out maintenance. Monitoring the temperature on this busbar will be carried out by utilizing technology from IoT which will be connected to the internet and integrated with smartphone devices. In this study, the authors will use the ESP32 module as a medium for receiving, storing, and displaying data on smartphone devices. ESP32 is a module often used for IoT projects. Equipped with Wi-Fi and Bluetooth features and has a Dual-Core Microprocessor which will make data processing faster. To be able to receive temperature data, an infrared MLX90614 sensor is needed. The MLX90614 infrared sensor is an electronic component that functions to detect heat without touching the object whose heat is to be measured because this sensor is facilitated with infrared light which can be directed at the object.
Design and Implementation of Solar Power System on Lettuce Hydroponic Greenhouse in Sekayu Musi Banyuasin Regency South Sumatera Province Sudarso, Hairad; Taqwa, Ahmad; Kusumanto, RD
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 3 No. 2 (2023): IJRVOCAS - August
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v3i2.208

Abstract

Cultivation of lettuce in a greenhouse is considered a sustainable agricultural technique. Unlike conventional farming, which is susceptible to water shortages, pests, and other uncertainties that can lead to inconsistent and lower-quality lettuce production, hydroponic cultivation in a greenhouse ensures not only high-quality lettuce production but also continuous availability of crops, protected from extreme weather conditions such as droughts and pests. Although greenhouse cultivation is an effective approach, in lowland areas like Sekayu City, the capital of Musi Banyuasin Regency, the microclimate inside the greenhouse can be relatively high and less favorable for lettuce growth. Lettuce ideally thrives in highland regions with a temperature of around 28°C and humidity of 76%. Therefore, it is necessary to control the microclimate inside the greenhouse to optimize lettuce growth. This control requires electrical energy to operate various electronic devices in the microclimate control system, such as exhaust fans and cooling pad water pump. In this study, a solar power electrical system is designed to meet the energy needs for operating a lettuce greenhouse in Sekayu City, Musi Banyuasin Regency, South Sumatra Province. The research was conducted for 31 days, from July 1 to July 31, 2023. The highest power output was recorded on July 31, 2023, at 11 kWh, while the lowest output occurred on July 20, 2023, at 5 kWh. The research utilized an MMPT inverter, which prevents overcharging and maintains a constant 50 A input power when charging the battery. Additionally, an IoT system was used to monitor the performance of the solar power generation system, facilitating data collection on electricity production.
Tensile Strength of S45C Steel Material for SMAW Welding with Various Cooling Media Sebayang, Alexander; Tarigan, Efrata; Tarigan, Liwat; Ginting, Berta; Irianto, Achmad
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 3 No. 4 (2024): IJRVOCAS - Special Issues - International Conference on Science, Technology and
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v3i4.1

Abstract

One of the welding methods that is widely used is the SMAW welding process (Shield Metal Arc Welding) which is also called Electric Arc Welding. This research aims to analyze the effect of variations in cooling media on tensile test results on welding results of S45C steel material. This research uses S45C material. The material is subjected to single vee joint welding, where at the completion of welding the material is immersed in a cooling medium of oil, water, air and is not treated in this research. From the research results, it can be concluded that the highest ultimate tensile strength (Tu) value is when the material is cooled with oil media, where the highest value is 517.15 N/mm2, followed by air cooling media, where the highest value is amounted to 475.85 N/mm2, and the lowest was with water cooling media where the highest value was 455.50 N/mm2. Thus, cooling with oil as a medium is the best between the two cooling media, water and air.

Page 12 of 23 | Total Record : 221

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