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All Journal Jurnal Ilmiah WUNY Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Rekayasa Mesin Journal of Environmental Engineering and Sustainable Technology International Journal of Mechanical Engineering Technologies and Applications (MECHTA)
Purnami Purnami
Brawijaya University
Humanities Automotive Engineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering Public Health

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KARAKTERISASI BIODEGRADASI PADA KOMPOSIT POLYMER POLYLACTID ACID (PLA) DENGAN PENAMBAHAN CHITOSAN DAN HYDROXYAPATITE Serfandi, Dina Novera; Setyarini, Putu Hadi; Purnami, Purnami; Sulistyono, Sulistyono
Jurnal Rekayasa Mesin Vol. 14 No. 3 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i3.1476

Abstract

Polylactid Acid (PLA) is a biodegradable polymer made from natural ingredients so it is safe to use for biomaterials. The purpose of this study was to determine the biodegradation characteristics of the addition of chitosan powder and Hydroxyapatite to PLA. There were 4 variations in this study, namely PLA 100 (pure PLA), PLA-chitosan-Hydroxyapatite 94-3-3 (Composite 1), PLA-chitosan-Hydroxyapatite 94-0-6 (Composite 2), PLA-chitosan-Hydroxyapatite 94-6-0 (Composite 3). Samples were prepared using the extrusion method to form filaments, then the filaments were injected with a temperature of 170-190°C and an injection pressure of 5-6 bar. Characterization was carried out using the Immerse Test, FTIR Test, and SEM-EDS Test. The results of the Immerse Test showed an increase in sample mass of 1.04%, 1.1%, 1.05% and 1.14% respectively. FTIR test results did not show any new functional groups in the composite. The results of the SEM test indicated the presence of Na and Cl deposits on the sample surface as evidenced by the results of the EDS test that all samples contained Na and Cl elements. So that the weight gain occurs because the three materials are not chemically mixed which easily separate and cause cavities, these cavities are filled with HBSS liquid.
THE IMPACT OF CHAOTIC FLUX REFLECTION FIELD ON HYDROGEN EVOLUTION REACTION OF WATER ELECTROLYSIS Nugroho, Willy Satrio; Esiliy , Rehab Ragay; Purnami, Purnami; Sofi'i, Yepy Komaril
International Journal of Mechanical Engineering Technologies and Applications Vol. 5 No. 1 (2024)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2024.005.01.2

Abstract

Water electrolysis promises the capability to produce green hydrogen in the future. The efficiency and hydrogen evolution reaction rate (HER) of water electrolysis can be improved through magnetic field assisted electrolysis. External magnetic field exposure improves hydrogen production without requiring complex catalyst synthesis technique. The purpose of this study is to introduce chaos into a magnetic field assisted electrolysis system which disturbs the water molecules stability. The chaos effect was triggered by irregular flux reflection technique. The flux reflection was generated using diamagnetic tourmaline stones which sticked all over the electrolyzer wall. Consequently, the rotational speed of DMF does not reduce the effectiveness of chaotic flux. As a result, the hydrogen bond of the water molecules is destabilized irregularly. In conjuction with that, the bonds are unable to be reformed which make the water molecules continuously in movement. The critical effect of chaotic flux is the shear force that experienced by water molecules. The paramagnetic OH- ion movement is also slowed down so that H+ ion and electrons interaction were occurred in less restrictive manner. Hence, the chaotic magnetic field able to improve HER.  The chaotic flux reflection improves hydrogen production in magnetic field assisted water electrolysis through water properties and ion transfer mechanism modification.
THERMOGRAVIMETRIC ANALYSIS OF PULVERIZED RICE HUSK WASTE CATALYTIC COMBUSTION WITH NATURAL ZEOLIT Hamidi, Nurkholis; Yuliati, Lilis; Purnami, Purnami; Faiz, Naufal Muhammad
International Journal of Mechanical Engineering Technologies and Applications Vol. 5 No. 2 (2024)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2024.005.02.7

Abstract

Rice husk is a type of agricultural waste that generated from rice production activities. The number continues to increase in line with the increasing food needs of the people in Indonesia. This study aims to determine the effect of the addition of natural zeolite as a catalyst and to determine the effect of natural zeolite mass percentage variation in the mixture on rice husk waste catalytic combustion by using the thermo gravimetric analysis method. The results of this study show that there is an effect of adding natural zeolite catalysts with the mass percentage of natural zeolite variations on the combustion characteristics and activation energy of each mixture. Increasing the mass percentage of natural zeolite catalysts can affect the reaction process become faster and minimize the effort required, but it was found that if the amount of natural zeolite catalyst is too much, it only adds to the heating load which causes slower reaction. The mixture of rice husks with 10% natural zeolite catalyst is the most optimal mixture because it has the lowest required activation energy value and the combustion reaction phases are achieved at a lower temperature than 5% and 15% mass percentage variations.
KARAKTERISASI PENAMBAHAN KITOSAN DAN HAP PADA PLA TERHADAP SIFAT MEKANIK KOMPOSIT Serfandi, Dina Novera; Setyarini, Putu Hadi; Purnami, Purnami; Sulistyono, Sulistyono
Jurnal Rekayasa Mesin Vol. 15 No. 3 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i3.1475

Abstract

PLA (poly lactid acid) is a biodegradable polyester that can be applied to tissue engineering because it is biocompatible and non-toxic. The purpose of this study to determine the mechanical characteristics of mixing PLA, chitosan, and Hydroxyapatite. There were 4 variations in this study, namely PLA 100 (pure PLA), PLA-chitosan-Hydroxyapatite 94-3-3 (Mix 1), PLA-chitosan-Hydroxyapatite 94-0-6 (Mix 2), PLA-chitosan-Hydroxyapatite 94-6-0 (Mix 3). The method of processing specimens is carried out by mixing the material using an extrusion machine to form filaments, then the filaments are cut to a size of 3-5 mm for injection processing with a process temperature of 170-190°C and an injection pressure of 5 Bar. The tensile strength value of the composite decreased by 0.14% from the tensile strength value of pure PLA it’s cause of the characteristic of chitosan and HAp were stiff and brittle.
Influence of Surface Roughness and Paint Coating on Corrosion Rate Akbar, Dekrit H.; Purnami, Purnami; Budio, Sugeng Prayitno
International Journal of Mechanical Engineering Technologies and Applications Vol. 1 No. 1 (2020)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/mechta.2020.001.01.3

Abstract

The technology of paint and its application develop fast, driven by the increasing cost of energy, raw material and labors. In this study, paint was used as a corrosion inhibitor on the surface of API 5L while saltwater is used as the corrosive media. The coating was varied for three different cases, i.e. primary coating only, primary and color coating as well as primary, color and glossy coating. Meanwhile, surface roughness was varied for 0.6, 0.7 and 0.8 μm. It is concluded that surface roughness and coating influence the corrosion rate. Smoother the surface and more coating layers lower the corrosion rate. Based on the study on API 5L steel, the lowest corrosion rate was obtained at 0.6 μm with 3 paint coatings (primary, color paint and clear/gloss)
THE EFFECT OF ELECTRODE COATING FROM BISPHENOL-A-POLYCARBONATE CD-R WASTE FOR HYDROGEN PRODUCTION Sulaiman, Abdul Mudjib; Mas'ud, Sifa'ul; Daroini, Ahmad Najih; Purnami, Purnami
International Journal of Mechanical Engineering Technologies and Applications Vol. 4 No. 1 (2023)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2023.004.01.2

Abstract

Water electrolysis is a method that utilizes direct electric current to decompose water into O2 and H2. The productivity of hydrogen produced in the electrolysis of water is low. One of the main reasons for the low electrolysis efficiency of water is the resistance of the electrode material. The electrode that is often used in the electrolysis of water is a graphite electrode. The coating on graphite electrodes can be a solution to minimize material degradation at the electrodes. With the condition that the coating material is able to slow down the damage to graphite electrodes and is a good electrical conductor. In this study, we used polycarbonate material as a material for coating the electrodes. The polycarbonate material that will be used is obtained from electrical waste, namely CD-R. The polycarbonate was separated mechanically and then ground to a powder with a size of 400 m. Polycarbonate powder will be coated on the cathode surface by the thermal coating method. Polycarbonate contains Bisphenol A compound which has an aromatic ring. The presence of a magnetic field caused by the delocalization of electrons in aromatic compounds will affect the hydrogen bonding in water. The positively charged surface charge of Bisphenol-A-Polycarbonate is able to reduce the acidity of the solution and accelerate the decomposition reactions of H2 and O2 by the water electrolysis method. Bisphenol-A-Polycarbonate coating is a good inhibitor for graphite electrodes. Coated graphite electrodes have a lower corrosion rate than pure or uncoated graphite electrodes. The layer inhibits the degradation of the material caused by electrochemical events during the water electrolysis process. Bisphenol-A-Polycarbonate (BPA) layer, which acts as an inhibitor and a catalyst simultaneously during the water electrolysis reaction, causes hydrogen production to increase.
THE EFFECT OF ADDITION BISPHENOL-A-POLYCARBONATE FROM CD-R WASTE AS A CATALYST FOR HYDROGEN PRODUCTION Mas'ud, Sifa'ul; Sulaiman, Abdul Mudjib; Syahputra, Hogi; Purnami, Purnami
International Journal of Mechanical Engineering Technologies and Applications Vol. 4 No. 2 (2023)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2023.004.02.1

Abstract

In producing hydrogen, various methods can be used, one of which is the electrolysis of water. Electrolysis is a method for breaking water molecules into oxygen and hydrogen by using an electric current. Electrolysis does not require complicated equipment and systems, so it can be said to be the easiest method of producing hydrogen. But of the various methods for producing hydrogen, the electrolysis method is not widely used because of its low efficiency. Because of this, many efforts have been made with the aim of increasing hydrogen production in the electrolysis of water. In this paper, we use Bisphenol-A-Polycarbonate (BPA) compounds obtained from unused CD-R layers. BPA has aromatic compounds that have been tested by FTIR. Aromatic compounds can generate their own magnetic field; this magnetic field is used to disrupt hydrogen bonds in water so that the electrolysis process can be more optimal. It is also known that, on the surface of BPA, it has a tendency to be positively charged by FESEM testing. The predominantly positive BPA surface works effectively to attract OH- ions. This causes a lot of H+ ions to move freely so that the solution becomes more acidic, which results in easier mobility of electric currents. With the addition of 3 grams of BPA, it can produce 46% more ppm of hydrogen than conventional.  
THE PREDICTION OF HYDROGEN EVOLUTION REACTION FROM DYNAMIC MAGNETIC FIELD ASSISTED WATER ELECTROLYSIS ARTIFICIAL NEURAL NETWORK Nugroho, Willy Satrio; Purnami, Purnami; Schulze, Ajani Aiman; Anggara, Teuku; Schulze, Klauss
International Journal of Mechanical Engineering Technologies and Applications Vol. 6 No. 1 (2025)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2025.006.01.1

Abstract

This study explores the prediction of Hydrogen Evolution Reaction (HER) performance in Dynamic Magnetic Field (DMF) assisted water electrolysis using Artificial Neural Networks (ANN). The integration of ANN models with experimental data from DMF-assisted electrolysis provides valuable insights into the complex interplay between magnetic fields and electrochemical processes. The results show significant enhancements in HER rates compared to conventional electrolysis, with static magnetic fields also contributing to performance improvements. The ANN models developed exhibit high accuracy in predicting HER performance under varying DMF rotational speeds, as evidenced by low Mean Squared Error (MSE), Root Mean Squared Error (RMSE), and high R-squared values, demonstrating their strong predictive power and reliability. However, caution is advised regarding overfitting, and future research should focus on incorporating techniques like regularization and cross-validation to enhance model generalization. This study lays the foundation for further optimization of efficient hydrogen production technologies in the context of sustainable energy solutions.
THE PREDICTION OF HYDROGEN EVOLUTION REACTION FROM DYNAMIC MAGNETIC FIELD ASSISTED WATER ELECTROLYSIS ARTIFICIAL NEURAL NETWORK Nugroho, Willy Satrio; Purnami, Purnami; Schulze, Ajani Aiman; Anggara, Teuku; Schulze, Klauss
International Journal of Mechanical Engineering Technologies and Applications Vol. 6 No. 1 (2025)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2025.006.01.1

Abstract

This study explores the prediction of Hydrogen Evolution Reaction (HER) performance in Dynamic Magnetic Field (DMF) assisted water electrolysis using Artificial Neural Networks (ANN). The integration of ANN models with experimental data from DMF-assisted electrolysis provides valuable insights into the complex interplay between magnetic fields and electrochemical processes. The results show significant enhancements in HER rates compared to conventional electrolysis, with static magnetic fields also contributing to performance improvements. The ANN models developed exhibit high accuracy in predicting HER performance under varying DMF rotational speeds, as evidenced by low Mean Squared Error (MSE), Root Mean Squared Error (RMSE), and high R-squared values, demonstrating their strong predictive power and reliability. However, caution is advised regarding overfitting, and future research should focus on incorporating techniques like regularization and cross-validation to enhance model generalization. This study lays the foundation for further optimization of efficient hydrogen production technologies in the context of sustainable energy solutions.
COMBINATION OF OEE AND FMEA METHODS TO ANALYZE THE EFFECTIVENESS OF PRODUCTION MACHINES Wardhani, Angelia Kusuma; Novareza, Oyong; Purnami, Purnami; Mohamad, Effendi Bin
International Journal of Mechanical Engineering Technologies and Applications Vol. 6 No. 2 (2025)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2025.006.02.1

Abstract

Maintenance concepts are required for equipment to maintain effectiveness and quality. One of the maintenance concepts offered is total productive maintenance which connects the synergy between all functions in the organization. In tpm, there is a method to calculate the value of machine effectiveness, namely the overall equipment effectiveness method. The purpose of oee itself is to maximize the output of the results of the available capacity. In this study aims to see the value of the effectiveness of existing machines in the production process. It was found that some OEE values were still below the JIPM level. JIPM itself is the OEE benchmark standard used by the world, jipm explains that the world standard for OEE is 85%.  Therefore, it is necessary to improve the maintenance system by using the TPM pillars of autonomous maintenance and training and education.
Co-Authors Akbar, Dekrit H. Anggara, Teuku ARDIANSYAH ARDIANSYAH Daroini, Ahmad Najih Denny Widhiyanuriyawan Dewi, Fransisca Gayuh Utami Dhimas Nur Cahyadi Dina Novera Serfandi Esiliy , Rehab Ragay Faiz, Naufal Muhammad I Nyoman Gede Wardana ING Wardana ING. Wardana, ING. Lilis Yuliati Mas'ud, Sifa'ul Mega Nur Sasongko Mohamad, Effendi Bin Nurkholis Hamidi Nurkholis Hamidy Oyong Novareza Putu Hadi Setyarini Schulze, Ajani Aiman Schulze, Klauss Serfandi, Dina Novera Slamet Wahyudi Sugeng Prayitno Budio Sulaiman, Abdul Mudjib Sulistyono Sulistyono Sulistyono Sulistyono Syahputra, Hogi Veronika K, Veronika Wardhani, Angelia Kusuma widya wijayanti Willy Satrio Nugroho Yepy Komaril Sofi’i Yusuf, M Umar