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All Journal Jurnal Simetris Rekayasa Mesin Jurnal Abdi Insani Jurnal Konversi Energi dan Manufaktur VARIANSI: Journal of Statistics and Its Application on Teaching and Research Jurnal Statistika dan Komputasi (STATKOM)
Pangruruk , Thesya Atarezcha Pangruruk
Universitas Mulawarman
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Social Sciences

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EVALUASI KONVERSI DAN DISTRIBUSI ENERGI PADA RESEARCH TEST ENGINE TIPE 240PE BERBAHAN BAKAR GASOLINE JENIS PERTALITE Paloboran, Marthen; Pangruruk , Thesya Atarezcha Pangruruk; Darmawang, Darmawang; Tjandi , Yunus Tjandi; Yasdin , Yasdin; Wabdillah , Wabdillah; Sidin, Udin Sidik; Asmeati , Asmeati
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.1626

Abstract

Gasoline fuel is a kind of fossil fuel that is still the primary fuel for vehicles and motorcycles nowadays. Demand for fuel continues to increase from time to time, so an effort is needed to save the use of fuel. This research is intended as an initial study to determine the quantity of heat energy converted and distributed into several engine performance parameters. Furthermore, the results of this study became the basis for the development of similar research to produce high engine performance and low emissions as well as economists by setting combustion parameters. The result shows that only a small portion of the heat generated from pertalite fuel is used as effective power. Most of the heat energy from the fuel is wasted in the environment and distributed into radiant heat, and some of it becomes heat to the exhaust gases and heat to the cooling water.
Optimalisasi Peramalan Total Aset PT. BPD Kaltim Kaltara dengan Double Exponential Smoothing Brown Ningsih, Eva Lestari; Nurmayanti, Wiwit Pura; Widyaningrum, Erlyne Nadhilah; Pangruruk, Thesya Atarezcha
Jurnal Statistika dan Komputasi Vol. 3 No. 2 (2024): Jurnal Statistika dan Komputasi
Publisher : Universitas Nahdlatul Ulama Sunan Giri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32665/statkom.v3i2.3525

Abstract

Background: Total assets can provide a comprehensive picture of the wealth owned by a company or institution, with total assets also helping to assess the scale of operations, stability, and the company’s ability to meet its financial responsibilities. Study on the total assets held by PT. BPD Kaltim Kaltara is interesting to do because it has an important role in advancing economic growth in the East Kalimantan and North Kalimantan regions. Digital transformation can influence how assets grow and how capital is structured. Objective: Predicting PT BPD Kaltim Kaltara’s total assets over the next three periods using the DES Brown method with the optimal constant. Methods: Double Exponential Smoothing Brown (DES Brown) with constants α = β = 0.3; 0.6; 0.7; 0.8. Results: The smallest MAPE value is obtained at the constant α = β = 0.3, indicating that the DES Brown method with this constant provides the most accurate forecasting results. Conclusion: The forecasting results for the next three periods show a stable upward trend, namely September at Rp48,389,055.93, October at Rp48,480,301.62, and November at Rp48,571,547.30. Thus, the DES Brown method has proven effective in forecasting the total assets of PT. BPD Kaltim Kaltara and can be used to support the company's financial decision making.
Pengaruh Diameter Belitan Ground Strap Terhadap Perbandingan Udara-Bahan Bakar (AFR) dan Konsumsi Bahan Bakar Spesifik (SFC) Pada Mesin Spark Ignition 150cc Paloboran, Marthen; Pangruruk, Thesya Atarezcha
Simetris: Jurnal Teknik Mesin, Elektro dan Ilmu Komputer Vol 16, No 1 (2025): JURNAL SIMETRIS VOLUME 16 NO 1 TAHUN 2025
Publisher : Fakultas Teknik Universitas Muria Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24176/simet.v16i1.13522

Abstract

The primary objective of this study is to evaluate the impact of providing a ground strap on the spark plug cable with varying diameters of the ground strap winding at 0.3, 0.6, and 0.9 mm. The evaluation was conducted on a 150 cc single-cylinder spark ignition engine. The engine was operated under Wide Open Throttle (WOT) conditions, with a speed ranging from 2000 to 7000 rpm in increments of 1000 rpm. The length of the ground strap winding on the spark plug cable was 23 cm, while the diameter of the spark plug cable was 0.8 mm, and its length was 23 cm. The data collected were the engine's performance results under standard conditions and at each variation of the ground strap diameter. The findings revealed that the smaller the ground strap diameter, the greater the improvement in engine performance. The provision of a ground strap on the spark plug cable significantly reduces the engine's specific fuel consumption compared to the engine without a ground strap, with an average reduction of 4.451%. Additionally, the air-fuel ratio value deviates from the stoichiometric condition by 9.25% at the best winding of 0.3 mm. On average, installing a ground strap on the spark plug cable also results in an increase in torque and engine power by 5.91% and 6.22%, respectively
The Impact of Varying Water Turbine Blade on Performance of Pico Hydro Power Plants Paloboran, Marthen; Pangruruk, Thesya Atarezcha; Hasim, Wabdillah; Ali, Andi Muhammad Taufik; Muflihat, Syakia; Kaju, Fatra Aderian
Jurnal Konversi Energi dan Manufaktur Vol. 10 No. 2 (2025)
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JKEM.10.2.2

Abstract

This study has a purpose to determine the number of blades effect on a water turbine regarding flow rate and turbine rotation. The turbine utilized in this study is a Pelton-type impulse turbine, which harnesses potential energy and water pressure to enhance its rotational speed. Additionally, it examines how turbine rotation affects voltage, current, and electric power generated. This research is an experimental study focusing on a prototype mini-micro hydro water turbine. The testing involved varying the valve openings at angles of 36°, 54°, 72°, and 90°, as well as the number of blades, which were set to 6, 8, and 10. The output parameters were measured using instruments that met the specifications for the test equipment. The results indicated that the minimum water discharge required to drive the turbine prototype was 30 cm³/s at a valve opening of 36°. The minimum power generated for each variation in the number of blades was as follows: 0.114 W for 6 blades, 1.426 W for 8 blades, and 1.672 W for 10 blades. At the maximum valve opening of 90°, a flow rate of 67 cm³/s was achieved. Under these conditions, the turbine generated powers of 1.5 W for 6 blades, 7.593 W for 8 blades, and 8.16 W for 10 blades. These findings demonstrate that the performance of the micro-hydro power generation system is significantly influenced by water discharge, turbine rotation speed, and the specifications of the power generator used. This study provides valuable insights for developing renewable energy sources to supply electricity in remote areas with limited access to conventional energy. Furthermore, the results can serve as a foundation for designing more efficient and sustainable micro-hydro systems in the future. The results indicate that an increase in the number of turbine blades leads to greater kinetic energy in the water, which in turn raises the rotational speed of the turbine. This increase in kinetic energy enhances the conversion of water energy into mechanical energy, resulting in improved efficiency of the turbine.
PELATIHAN ANALISIS DATA DENGAN SOFTWARE R BAGI SISWA SMA NEGERI 8 SAMARINDA Sari, Nariza Wanti Wulan; Sifriyani, Sifriyani; Suyitno, Suyitno; Wahyuningsih, Sri; Yuniarti, Desi; Purnamasari, Ika; Mahmudah, Siti; Nurmayanti, Wiwit Pura; Widyaningrum, Erlyne Nadhilah; Nugraha, Pratama Yuly; Pangruruk, Thesya Atarezcha; Hidayanty, Nurul Ilma; Kosasih, Raditya Arya; Bahriah, Ayu
Jurnal Abdi Insani Vol 12 No 7 (2025): Jurnal Abdi Insani
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/abdiinsani.v12i7.2136

Abstract

Students of SMA Negeri 8 Samarinda have received material on statistics since grade X. In the learning process, teachers use Microsoft Office Excel software which is closed source. So through this community service activity, a solution is provided by disseminating data analysis and alternative open source software 'R'. Community service activities are packaged in the form of training. Evaluation of activities in the form of pretest and posttest questionnaires and activity feedback surveys. This activity was carried out on September 11, 2024 in the Computer Laboratory Room of SMA Negeri 8 Samarinda. The number of students who participated in this activity consisted of 36 students. Based on the analysis of the pre-test and post-test data, it was concluded that there was an increase in student understanding after the training. The results of the feedback stated that the training material was easy, the explanations given were considered interesting, and the training activities were considered useful by the participants. Furthermore, participants hope that there will be follow-up activities to hold similar activities again.
Pemodelan dan Prediksi Pola Musiman Menggunakan Holt-Winters Pangruruk, Thesya Atarezcha
VARIANSI: Journal of Statistics and Its application on Teaching and Research Vol. 7 No. 2 (2025)
Publisher : Program Studi Statistika Fakultas MIPA UNM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35580/variansiunm391

Abstract

Kota Samarinda yang beriklim tropis memiliki curah hujan dengan variasi signifikan sepanjang tahun. Ketidakstabilan ini berpotensi menimbulkan dampak seperti banjir, gangguan pada sektor pertanian, dan kerusakan infrastruktur. Penelitian ini bertujuan untuk menganalisis serta memprediksi pola musiman terjadinya curah hujan di Kota Samarinda dengan menerapkan metode Holt Winters Exponential Smoothing model multiplikatif. Data curah hujan bulanan dianalisis untuk mengidentifikasi sifat stasioneritas pada rata-rata dan varian, dengan hasil menunjukkan bahwa data bersifat stasioner dalam rata-rata namun tidak dalam varian sehingga digunakan model Holt-Winters Exponential Smoothing Multiplikatif. Estimasi parameter model menghasilkan nilai alpha , beta , dan gamma masing-masing sebesar 1, dengan nilai MAPE sebesar 50%, yang menunjukkan tingkat akurasi sedang. Meskipun tingkat kesalahan cukup tinggi, model ini tetap mampu menggambarkan pola musiman yang berguna untuk perencanaan awal pengelolaan sumber daya air di wilayah tersebut.
Co-Authors Ali, Andi Muhammad Taufik Asmeati Asmeati Bahriah, Ayu Darmawang, Darmawang Erlyne Nadhilah Widyaningrum Hidayanty, Nurul Ilma Ika Purnamasari Kaju, Fatra Aderian Kosasih, Raditya Arya Marthen Paloboran Muflihat, Syakia Nariza Wanti Wulan Sari Ningsih, Eva Lestari Nugraha, Pratama Yuly Nurmayanti, Wiwit Pura Sifriyani, Sifriyani SITI MAHMUDAH Sri Wahyuningsih Suyitno Suyitno Tjandi , Yunus Tjandi Udin Sidik Sidin Wabdillah Wabdillah, Wabdillah Yasdin, Yasdin Yuniarti, Desi