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Manufacturing Acetabular Liner UHMWPE using CNC Milling Wahyu Dwi Lestari Edahwati; Luluk Edahwati; Radissa Dzaky Issafira; Wiliandi Saputro; Ahmad Khairul Faizin; Ndaru Adyono; Tria Puspa Sari
BIOMEJ Vol. 1 No. 2 (2021): BIOMEJ
Publisher : UPN 'Veteran" Jawa Timur

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Abstract

Ultra High Molecular Weight Polyethylene (UHMWPE) is a biomedical polymer that is useful in the orthopedic field as a bearing component in artificial hip joints. In general, these polymers pair up and rub against each other with metallic biomaterials, namely 316L stainless steel, cobalt chromium (CoCr) and titanium, which can cause material wear problems. One way to increase the wear resistance of UHMWPE is through the manufacturing process. The purpose of this research is to manufacture acetabular liner products using a CNC milling machine to obtain high surface quality and dimensional accuracy. The CNC milling machine used is the type of YCM 1020 EV 20. The manufactured specimen is then measured for roughness and dimensional accuracy. Based on the measurement results, it is found that the acetabular liner specimens from the CNC milling process are still in accordance with the standard ASTM standard (F 2033-12).
Availability of Palm Oil Biodiesel in Indonesia and Its Effect on Diesel Engine: A Review Wiliandi Saputro; Wahyu Dwi Lestari Edahwati; Luluk Edahwati; Radissa Dzaky Issafira; Ahmad Khairul Faizin; Ndaru Adyono; Tria Puspa Sari
BIOMEJ Vol. 1 No. 2 (2021): BIOMEJ
Publisher : UPN 'Veteran" Jawa Timur

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Abstract

Palm oil is one of the base ingredients that can be used in making of biodiesel which is an alternative fuel to replace diesel fuel. The ability of palm oil as biodiesel should be balanced with the quantity of palm oil as well as the level of biodiesel production capability. In this paper, authors try to analyze about palm oil as biodiesel starting from number of palm plantations up to the level of biodiesel production capability from palm oil. The analysis conducted in the first part of this paper can be used as a reference that shows the level of availability of the palm oil which can be processed into biodiesel as an alternative fuel in the future. In the next part, the authors tried to analyze the impact of biodiesel made from palm oil starting from engine performance, exhaust gas emissions, rate of wear, quality of lubricant, and deposit formed. It was is done in order to find out the advantages and disadvantages that occur from biodiesel so that it can be used as a reference or consideration in the use of biodiesel-fueled palm oil.
The Parameter Experimental on the Dry Cell Type of Water Electrolysis for the HHO Gas Production Tria Puspa Sari; Afira Ainur Rosidah; M. H. B. Satria; Siti Chalimah; Amajida Sadrina; Ramadan Bimo Anggoro
Nusantara Science and Technology Proceedings 4th International Conference Eco-Innovation in Science, Engineering, and Technology
Publisher : Future Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/nstp.2023.3613

Abstract

The global energy crisis, stemming from the heavy reliance on depleting fossil fuel reserves, has become a critical concern for countries worldwide, including Indonesia. In recent initiatives, hydrogen gas has emerged as a promising alternative energy carrier, generated through processes like electrolysis, which breaks down compounds containing hydrogen. This research focuses on the utilization of water electrolysis using SS 316 L, Copper, and Aluminium plates with NaHCO3, NaCl, KOH, and NaOH as catalysts. The primary objective of this study is to determine the type of plate that can produce hydrogen with lower resistivity. The average power consumption for each plate is as follows: SS 316 L at 129.88 Watts, Copper at 199.41 Watts, and Aluminium at 499.45 Watts. From the research findings, it can be concluded that the use of SS 316 L plates with NaOH as the catalyst is the most effective combination in this study, as it results in higher hydrogen production with lower power consumption or greater efficiency compared to the others. In the future, it is hoped that the research can be continued using solar panels as an alternative power source to replace the electricity supply from the national grid (PLN).
Karakteristik Pembakaran Droplet Campuran Bensin Oktan Rendah dengan Penambahan Minyak Kulit Jeruk Musyaroh; Anisah Nurul Izzah; Rizqa Ruviana; Fatkhurrohman; Tria Puspa Sari; Widya Wijayanti
TURBO [Tulisan Riset Berbasis Online] Vol 15 No 1 (2026): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v15i1.4741

Abstract

The use of waste as an alternative fuel is being continually developed to support the clean energy transition. Orange peel oil (OPO) contains limonene, a volatile hydrocarbon compound with double bonds that has the potential to be used as a gasoline additive. However, studies directly examining its effect on droplet combustion characteristics are still limited. This study aims to fill this gap by evaluating the droplet combustion dynamics of a mixture of low-octane gasoline and OPO through visual and thermal approaches. Experiments were conducted by burning 10 µL droplets using a metal stand, with the essential oil concentration varying from 1% to 100%. Visualization was performed using a high-speed camera, and temperature measurements were carried out with a K-type thermocouple. The results showed that the addition of OPO prolonged the combustion time, decreased the combustion rate constant, and increased the maximum temperature. Microexplosions were observed starting at concentrations ≥25%, due to differences in boiling points between the components. Flame visualization confirmed the quantitative results, with brighter and longer-lasting flames at higher concentrations. This study concludes that OPO can significantly modify the droplet combustion characteristics and shows potential as a waste-based biofuel additive, which can improve the efficiency and sustainability of gasoline combustion systems
Peningkatan Literasi Energi Terbarukan melalui Edukasi Panel Surya pada Siswa SMP Negeri 8 Probolinggo Rizqa Ruviana; Luluk Edahwati; Musyaroh Musyaroh; Tria Puspa Sari; Fatkhurrohman Fatkhurrohman; M Danny Pratama Lamura; Anisah Nurul Izzah
Publikasi Pendidikan Vol 16, No 2 (2026)
Publisher : Universitas Negeri Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70713/publikan.v16i2.82850

Abstract

Low renewable energy literacy among students remains a challenge in supporting energy transition and sustainable development. This community service program aimed to improve renewable energy literacy through solar panel education and training for students at SMP Negeri 8 Probolinggo. A quantitative descriptive approach with a pretest posttest design was employed. The program involved 30 ninth grade students who participated in interactive workshops on renewable energy concepts, counseling on the role of green energy in reducing carbon emissions, and hands-on practice in basic solar panel installation and maintenance. Program outcomes were evaluated using a five-point Likert-scale questionnaire consisting of 20 statements grouped into seven assessment parameters. The results showed consistent improvements across all parameters, with percentage increases ranging from 10.7% to 39.3%. The highest improvement was observed in the maintenance and evaluation of solar panels, while the lowest increase occurred in students’ attitudes toward supporting renewable energy. These findings indicate that practice-based educational interventions are effective in enhancing students’ knowledge, basic technical skills, and environmental awareness. This program contributes to the achievement of Sustainable Development Goals, particularly SDG 4 (Quality Education), SDG 7 (Affordable and Clean Energy), and SDG 13 (Climate Action).