Article Per Year (5 Year)
p-Index From 2020 - 2025
5.327
P-Index
This Author published in this journals
All Journal Jurnal Dinamis Rekayasa Mesin ROTOR: JURNAL ILMIAH TEKNIK MESIN Journal of Mechanical Engineering Science and Technology Jurnal Voering Jurnal Rekayasa Material, Manufaktur & Energi CARADDE: Jurnal Pengabdian Kepada Masyarakat Infotekmesin Jurnal Dinamis Community Empowerment Jurnal Ilmiah Wahana Pendidikan Jurnal Pengabdian Masyarakat untuk Negeri (UN-PENMAS) Automotive Experiences Abdimas Dinamis Jurnal Medika: Medika
Helen Riupassa
Universitas Sains Dan Teknologi Jayapura, Jayapura, Indonesia
Religion Aerospace Engineering Arts Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Dentistry Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Nursing Public Health Social Sciences Other

Published : 34 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 34 Documents
Search

 1   2   3   4 
Characterizing of Nano Activated Bio-Carbon of Sago Waste as a Homogeneous Combustion Catalyst Nanlohy, Hendry Y.; Riupassa, Helen; Setiyo, Muji
Automotive Experiences Vol 7 No 1 (2024)
Publisher : Automotive Laboratory of Universitas Muhammadiyah Magelang in collaboration with Association of Indonesian Vocational Educators (AIVE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.10619

Abstract

Alternative fuels were developed by blending crude coconut oil and bio-carbon nanoparticles. Bio-carbon, derived from sago waste via pyrolysis and ground using a ball mill, underwent FTIR testing to assess its energy absorption capabilities. SEM analysis was conducted to examine the surface morphology of bio-catalyst with and without crude coconut oil. The findings indicate that incorporating bio-catalyst can enhance mechanical properties, facilitating rapid heat absorption, as evidenced by reduced flashpoint and viscosity. In addition, the results show an increase in fuel mass, broadening of molecular contacts, increased reactivity, and increased heat absorption for easier ignition. This phenomenon indicates that bio-carbon of sago waste have great potential for biofuel use as a homogeneous combustion catalyst.
Karakteristik Pembakaran Difusi Campuran Bahan Bakar Minyak Kelapa Murni Dengan Bioaditif Minyak Cengkeh Fairuddin, Fairuddin; Riupassa, Helen; Nanlohy, Hendry Y.
Rekayasa Material, Manufaktur dan Energi Vol 7, No 1: Januari 2024
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v7i1.17499

Abstract

Biofuel derived from raw vegetable oil is considered a crucial alternative energy source to address the escalating fuel energy crisis due to the growth of industrial activities and the human population. The compounds present in raw coconut oil, including saturated fatty acids, monounsaturated fatty acids, polyunsaturated fatty acids, and glycerol, constitute the focus of this research. The combustion of raw coconut oil involves a complex reaction due to the presence of saturated chain bonds, necessitating additional substances to weaken the carbon chains and enhance the combustion rate. This study employs the suspended droplet combustion method to increase the contact between air and fuel, thereby improving the reactivity of fuel molecules. To boost the combustion rate of coconut oil droplets, a bio-additive in the form of clove oil is experimentally added. Research findings reveal that the compound eugenol in clove oil possesses aromatic properties and a non-symmetrical carbon chain geometry. This factor can potentially expedite effective collisions among fuel molecules, consequently improving the ease of fuel combustion. In conclusion, this research provides insights into the potential use of coconut oil as a biofuel, highlighting the role of bio-additives such as clove oil in enhancing combustion rate efficiency. The study contributes to our understanding of strategies that can be applied to optimize the utilization of biofuel derived from raw vegetable oil.
Peran Minyak Kayu Putih Terhadap Karakteristik Pembakaran Minyak Kapuk Sebagai Bahan Bakar Alternatif Riupassa, Helen
Rekayasa Material, Manufaktur dan Energi Vol 6, No 2: September 2023
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v6i2.15818

Abstract

The study conducted experimental investigations on the burning rate of crude kapuk oil droplets by incorporating bio-additives derived from eucalyptus oil. The bio-additive concentration of eucalyptus oil added to the kapuk oil was 100 ppm and 300 ppm, respectively. The droplet combustion method was chosen to maximize the contact area between the air and fuel, thereby enhancing the reactivity of fuel molecules.The findings revealed that the cineol compounds present in eucalyptus oil exhibit aromatic properties and possess an asymmetrical carbon chain geometry. This characteristic has the potential to facilitate effective collisions among fuel molecules, thereby promoting combustion. This was evident from the observed increase in the burning rate. Furthermore, the observations indicated that the highest burning rate was achieved when both bio-additives were 300 ppm.These results highlight the positive impact of incorporating eucalyptus oil as a bio-additive in crude kapuk oil. The aromatic nature and unique geometric structure of cineol compounds contribute to the fuel's increased reactivity and enhanced combustion performance. By utilizing bio-additives, such as eucalyptus oil, at an optimal concentration, it is possible to further improve kapuk oil's burning characteristics and overall performance as a biofuel.These findings provide valuable insights into the development of more efficient and sustainable alternative energy sources. By understanding the molecular aspects and effects of bio-additives, researchers can continue to explore and optimize the utilization of biofuels, such as crude kapuk oil, for a greener and more environmentally friendly energy future.
Study Eksperimental Karakteristik Penyalaan Minyak Kelapa Sebagai Bahan Bakar Alternatif Dengan Penambahan Bioaditif Minyak Kayu Putih Timang, Rison Sando; Riupassa, Helen; Nanlohy, Hendry Y.
Rekayasa Material, Manufaktur dan Energi Vol 7, No 2: Juli 2024
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v7i2.18251

Abstract

The limited availability of diesel oil encourages efforts to find new energy sources as alternative diesel fuels. Biodiesel can be extracted from various agricultural products, for example, coconut oil. As a tropical country, Indonesia is a very effective and potential country as a coconut producer. Vegetable oil has a higher viscosity than diesel oil. Compose bio-oils with various fuels additive is the way to reduce viscosity values, among others, by combining nanocarbon and metal catalysts. This study goals to know the characteristics of burning coconut oil as an alternative fuel with the addition of eucalyptus oil; and how long the combustion process takes from the starting point to the end. The results showed that adding eucalyptus oil to coconut oil can reduce the weakening of the carbon chain and increase the combustion temperature. The combustion efficiency of this coconut oil mixture varies depending on the amount of eucalyptus oil added, resulting in faster fuel combustion and a more powerful explosion. The color of the fire is an essential factor in ensuring that this mixture can be used safely and efficiently.
Computational Fluid Dynamics Analysis of Temperature Distribution in Solar Distillation Panel with Various Flat Plate Materials Trismawati, Trismawati; Nanlohy, Hendry Y.; Riupassa, Helen; Marianingsih, Susi
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 8, No 1 (2024)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um0168i12024p108

Abstract

As the world population continues to grow, the demand for clean water is increasing daily, making it a crucial resource to access. However, there are ways to harness abundant resources like solar energy and seawater to produce clean water. The present studies have conducted experimental investigations to convert seawater into freshwater using solar stills, where solar energy is utilized as the primary heat source for evaporation. The temperature distribution inside the solar stills was analyzed using a flat plate made of three different materials: copper, stainless steel, and aluminum. To examine the temperature distribution and performance of the solar stills, researchers employed computational fluid dynamics simulations (Ansys R15.0). The results showed variations in temperature distribution among the three plate materials. Copper flat plates achieved the highest temperature, approximately 44.5 Celsius, followed by aluminum at 43.91 Celsius, while stainless steel exhibited the lowest temperature at around 42.01 Celsius. The average heat flux across the three materials was approximately 581 W/m2. Additionally, observations indicated that the amount of convection occurring in copper flat plates was 121.108 Watts; in aluminum, it was 118.517 Watts; and in stainless steel, it was 105.05 Watts. The radiation energy for stainless steel flat plates was 29.93 W; for copper, 16.14 W; and for aluminum, 13.49 W.
Karakteristik Penyalaan Droplet Minyak Biji Bunga Matahari Dengan Penambahan Karbon Aktif Kulit Pinang Ulwan, Abdullah; Riupassa, Helen; Mini, Marthina; Suyatno, Suyatno
Rekayasa Material, Manufaktur dan Energi Vol 8, No 1: Januari 2025
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v8i1.22248

Abstract

This study aims to reveal the role of biocatalysts based on activated biocarbon from areca nut shell waste in improving the ignition performance of sunflower seed oil droplets as an alternative fuel. Sunflower seed oil, which is rich in unsaturated fatty acids, has strong intermolecular binding forces that slow down its ignition. To overcome this, biocatalysts from activated areca nut shells were used. FTIR analysis showed an increase in the ability of fuel molecules to absorb heat, while TEM studies revealed that biocarbons have high porosity and uniform particle distribution, which supports combustion efficiency. Observations of temperature and droplet evolution using thermocouples and high-speed microscope cameras showed a significant increase in the ignition rate. The results indicate that this biocatalyst not only improves ignition efficiency but also utilizes organic waste, making it an environmentally friendly and sustainable fuel solution.
Karakteristik Penyalaan Droplet Minyak Kelapa Dengan Campuran Biokatalis Karbon Aktif Kulit Pinang Walintukan, Akbar Vicky V; Riupassa, Helen; Nanlohy, Hendry Yoshua
Rekayasa Material, Manufaktur dan Energi Vol 8, No 1: Januari 2025
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v8i1.21756

Abstract

This study aims to reveal the combustion characteristics of coconut oil as an alternative fuel by adding active bio-carbon catalysts from areca nut skin. 1-3 ppm catalysts reduce viscosity, so the fuel quickly absorbs heat and ignites. This study uses the www droplet ignition method to increase the contact area between air and fuel so that the reactivity of fuel molecules increases. The results showed that adding areca nut skin-activated carbon catalysts improved fuel performance, whereas coconut oil fuel can absorb heat and release energy quickly. This was clarified from the results of the TGA test, where when compared with a mixture of 1 to 3 ppm, it was seen that the mix of coconut oil with a two ppm catalyst was the most effective because it had a high temperature with a stable heat flow. These results indicate that activated carbon from areca nut skin has excellent potential to be used as a biocatalyst for environmentally friendly and economical vegetable oil.
Captivating Combustion Traits of Bio-Oil Droplets Enriched with Bio-Additives from the Areca Shell Waste Raehan, Muhammad Alif; Riupassa, Helen; Nanlohy, Hendry Yoshua
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 8, No 2 (2024)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v8i22024p384

Abstract

Fuel derived from crude vegetable oil, such as coconut oil, holds promise as an alternative energy source to mitigate the increasing reliance on fossil fuels driven by population growth and industrial activities. The experiment involved suspending a single droplet of crude coconut oil mixed with activated carbon from areca shell waste and placed at the junction on R-type thermocouple (Pt/Pt-Rh13%). The droplets were ignited using a hot wire and subjected to atmospheric pressure and room temperature. Coconut oil comprises a saturated triglyceride carbon chain compound of approximately 91%, and areca shell waste possesses a porous structure that fosters favorable interactions between fuel molecules. The droplet combustion method was selected to streamline the process and enhance the contact area between air and fuel, thereby boosting the reactivity of fuel molecules. The research found that adding activated carbon shortens the carbon chain, making it more reactive and easier for the fuel to ignite. Specifically, activated carbon significantly enhances fuel performance at a concentration of two parts per million (ppm). At this level, the fuel absorbs heat more effectively and ignites faster compared to one ppm and three ppm levels. Moreover, the results show that heat absorption occurs slowly at one ppm, while at three ppm, the increased molecular mass of the fuel can strengthen carbon-bonding forces. These factors contribute to a longer ignition time for the fuel. The findings suggest that the activated carbon from areca shell waste can play a good role as a combustion catalyst, where overall, fuel performance increases.
Enhancing clean water management skills for public health in Lake Sentani Andika Prasetya; Calvin R. Rumansara; Bambang Suhartawan; Suyatno Suyatno; Helen Riupassa; Marthina Mini; Hendry Y. Nanlohy
Community Empowerment Vol 9 No 4 (2024)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ce.11304

Abstract

Lake Sentani has an area of around 9,630 hectares and is situated at an altitude of 72 meters above sea level. Its water is consistently utilized by the residents of Yobeh Village for drinking, cooking, bathing, washing, and toileting. This activity directly impacts the cleanliness and quality of the lake water, consequently affecting public health. Observations have revealed that the community, especially children, suffer from negative impacts such as diarrhea and stomachaches. Hence, the objective of this community service activity is to enhance the understanding and skills of village communities in obtaining clean and hygienic water from Lake Sentani. The methods employed include socialization, training, and mentoring. The outcomes show that the community has developed a new mindset regarding the water potential of Lake Sentani and has acquired excellent skills in managing the lake water to ensure its cleanliness and healthiness.
Peran Nano Biokarbon Aktif Dari Kulit Pinang Terhadap Karakteristik Pembakaran Droplet Minyak Biji Bunga Matahari Harsanta, Bagus E.; Riupassa, Helen; Nanlohy, Hendry Y.
Infotekmesin Vol 16 No 1 (2025): Infotekmesin: Januari 2025
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v16i1.2526

Abstract

Continuous exploitation of fossil fuels causes scarcity, so appropriate solutions and policies are needed. One of these solutions is to utilize vegetable oil, and one of them comes from sunflower seed oil, which contains 17% oleic fatty acid and around 73% linoleic. However, its high viscosity, making it difficult to burn, hampers its use as an alternative fuel. Therefore, efforts are made to reduce its viscosity. One of these efforts is to add a catalyst in the form of active nano bio carbons derived from areca nut skin. Droplet combustion is chosen to increase the contact area between air and fuel so that the reactivity of fuel molecules increases. The study's results showed that the quality of fuel produced from a mixture of sunflower seed oil and active nano biocarbon from areca nut skin was improved. It was found that a concentration of 1 ppm was the best compared to other concentrations (2 and 3 ppm). It can be seen that it was able to reduce the viscosity of sunflower seed oil to 11.16 cSt, reduce the flash point at 138°C, and can increase the droplet combustion rate by around 2.05 seconds.
Co-Authors Alfons, Alfred Benjamin Andi Sanata Andika Prasetya Bambang Suhartawan Basri Katjo Bonefasius Bao Bosta Sihombing Calvin R. Rumansara Fairuddin, Fairuddin Harsanta, Bagus E. Haurissa, Jusuf Hendry Y. Nanlohy Herman Hi. Tjolleng Taba Herman Tjolleng Taba Hotnida Nainggolan I Made Rasta Ikhwansyah Isranuri Iriyanto, Santje M Iriyanto, Santje Magdalena Kenny H Marianingsih, susi Marthina Mini Marthina Mini Marthina Mini Marthina Mini Marthina Mini, Marthina Martina Mini Masaki Yamaguchi Masaki Yamaguchi Mebin Samuel Panithasan Muhammad Akhlis Rizza Muji Setiyo Nevada M.J. Nanulaitta Nurwijayanti Rachmat Subagyo Raehan, Muhammad Alif Ribut Jayanto Rolling Gasperzs Satworo Adiwidodo Selcuk Sarikoc Susi Marianingsih Suyatno Suyatno Suyatno Suyatno Syamsudin Usman T. Ahri Bahriun Takuya Tomidokoro THOMAS KBAREK Thomas Kbarek Timang, Rison Sando Trismawati Trismawati Trismawati Trismawati Trismawati, Trismawati Tugiman Tugiman Ulwan, Abdullah Usman, Syamsudin Walintukan, Akbar Vicky V Yamaguchi, Masaki