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All Journal Jurnal Pengolahan dan Bioteknologi Hasil Perikanan Imajinasi Jurnal Teknik Mesin Jurnal Rekayasa Mesin Jurnal Pengabdian Magister Pendidikan IPA Journal of Renewable Energy and Mechanics Jurnal Teknik Mesin Cakram Piston: Journal of Technical Engineering Jurnal Jendela Inovasi Daerah Buletin Peternakan Tropis (Bulletin of Tropical Animal Science) Unram Journal of Community Service (UJCS) QiST: Journal of Quran and Tafseer Studies Jurnal Riset Rumpun Ilmu Teknik (JURRITEK) JIPTEK Journal of International Multidisciplinary Research Strength : Jurnal Penelitian Teknik Mesin
Nur Rohmat
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Performance and Thermal Efficiency Analysis of A Household-Scale Waste Incinerator without External Fuel Nurjaya, Nurjaya; Reson Wibowo,; Nur Rohmat; Muhamad Cahyadi
Journal of Renewable Energy and Mechanics Vol. 9 No. 01 (2026): REM VOL 9 No 01 2026
Publisher : UIR PRESS

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Abstract

Household waste accumulation has become a significant environmental issue in urban areas. This study evaluates the thermal performance and mass-reduction efficiency of a household-scale waste incinerator prototype operating without external fossil fuel under natural-draft airflow. The combustion chamber was fabricated from a cylindrical steel drum equipped with primary air inlets. Mixed household waste (initial mass 5 kg; moisture content 28%) was tested. Temperature was measured using a K-type thermocouple positioned at the chamber centre. The maximum recorded temperature reached 100°C within 40 minutes. Mass reduction reached 25%, calculated based on initial and final mass measurements. The estimated thermal efficiency was 7.1%, determined using a simplified energy balance approach. The results indicate that the prototype operates under low-temperature thermal degradation conditions rather than complete incineration. Design improvements are required to achieve standard incineration temperatures.
The Effect of Thermal Conditions on Airflow and Heat Transfer in a Test Object: An Experimental Study Hilmala Nurmualimah; Nur Rohmat; Alvian Harris Gita Purnama
JURAL RISET RUMPUN ILMU TEKNIK Vol. 5 No. 2 (2026): Agustus: Jurnal Riset Rumpun Ilmu Teknik
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jurritek.v5i2.8602

Abstract

This research aims to analyze the influence of thermal conditions; specifically the temperature difference between the test object and the environment; on the characteristics of air flow and heat transfer around it. The object of this study is a test piece subjected to free air flow under various temperature conditions; focusing on the convection heat transfer phenomenon. The main problem addressed is how temperature variations affect the convection heat transfer coefficient; heat transfer rate; and heat flux; as well as changes in air velocity and pressure profiles. Therefore; the objective of this research is to quantitatively compare and assess these thermal and fluid parameters through an experimental study approach and Computational Fluid Dynamics (CFD) simulation. The methodology involves direct measurement of temperature and pressure parameters under low and high-temperature conditions; which are then processed to determine the convection coefficient (); heat transfer rate (); and heat flux (). The main findings indicate that at low-temperature conditions; the heat transfer coefficient () was found to be 53.26 ; the heat transfer rate () was 24.99 W; and the heat flux () was 537.87 ; with a pressure drop of 0.86 Pa. In conclusion; thermal conditions play a crucial role in determining the dynamics of air flow and the efficiency of heat transfer; the greater the temperature difference (); the higher the potential heat transfer rate; establishing a strong correlation between thermal conditions and the convection phenomenon.
Analisis Daya Prototipe Superkapasitor Berbasis N-Glc dan Elektrolit Na2SO4 Jonatan Hutapea; Nur Rohmat; Hasky Bambang Kurniawan
JURAL RISET RUMPUN ILMU TEKNIK Vol. 5 No. 2 (2026): Agustus: Jurnal Riset Rumpun Ilmu Teknik
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/jurritek.v5i2.8604

Abstract

The increasingly complex global energy problem drives the need for efficient, low-cost, and environmentally friendly energy storage systems. This study aims to analyze the power performance of two symmetric supercapacitor prototypes using Nitrogen-doped Graphene-Like Carbon (N-GLC) as the electrode material and 1 M  as the electrolyte, with different electrode substrates: aluminum and copper. Both prototypes were tested through charging and discharging processes using resistive loads of 470 ohms and 560 ohms for 5 minutes. The analyzed parameters include voltage, current, power, and output energy. The results show that the aluminum electrode achieved a higher maximum charging power of up to 18 mW; however, its energy discharge efficiency was very low at only 0.87%. In contrast, the copper electrode demonstrated a more balanced charging and discharging performance with an energy discharge efficiency of 19.4%. Analysis also indicates that the copper substrate maintains better voltage stability after 6 hours of storage compared to aluminum, which experienced significant degradation. Thus, the copper electrode is superior in maintaining the power and stability of a simple N-GLC-based symmetric supercapacitor system.
Pembuatan Silase sebagai Solusi Kelangkaan Pakan di Musim Kemarau Siti Rahmawati Zulaikhah; Arif Harnowo Sidhi; Nur Rohmat; Nurreni Irawati
Jurnal Pengabdian Magister Pendidikan IPA Vol 9 No 2 (2026): April-Juni 2026
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpmpi.v9i2.15099

Abstract

Kelompok Ternak “Sari Banjar Makmur” berada di Desa Banjarsari Kulon Rt 01 Rw 02 Kecamatan Sumbang, Kabupaten Banyumas. Anggota kelompok sebanyak 45 orang, dengan ketua bapak Warsito. Masalah yang dihadapi oleh kelompok tersebut adalah kesulitan pakan ternak saat musim kemarau. Solusi yang diberikan adalah memberikan teknologi pembuatan pakan dengan fermentasi yaitu pembuatan silase, untuk menjamin ketersediaan pakan di musim kemarau, karena mempunyai massa simpan yang lama dan tetap terjaga kandungan nutrisinya. Tujuan kegiatan pengabdian ini adalah Metode pelaksanaan pengabdian adalah (1) sosialisasi program berupa pembuatan silase sebagai usaha untuk mengatasi kesulitan pakan di musim kemarau, (2) penyuluhan dan pelatihan dengan menyampaikan materi tentang pembuatan silase, manfaat, dan cara pemberian ke ternak, (3) melakukan demonstrasi, sebagai praktek dari materi yang diberikan, (4) melakukan monitoring dan evaluasi, untuk menilai keberhasilan dari program pengabdian. Hasil kegiatan ini adalah respon positif dari kelompok, mereka memperoleh pengetahuan dan praktek secara langsung mengenai pembuatan silase sebagai alternatif pakan saat musim kemarau. Kesimpulan dari kegiatan pengabdian ini adalah pelatihan pembuatan silase menunjukkan bahwa teknologi pembuatan silase dapat mengatasi kesulitan pakan, dan mempunyai manfaat dapat meningkatkan kualitas pakan dan produktivitas ternak. Evaluasi, pendampingan, dan monitoring menjadi langkah untuk memastikan penerapan teknologi di masyarakat.
Strength Analysis of Dissimilar Welded Joints Applied to Hydraulic Excavator Rod Arm Abdul Choliq; Fifit Astuti; Nur Rohmat
Jurnal Rekayasa Mesin Vol. 21 No. 2 (2026): Volume 21, Nomor 2, Agustus 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

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Abstract

Dynamic workloads during hydraulic excavator operations frequently cause the joint between the shaft rod and the rod end to crack or even fracture. Although welding is often selected for economic reasons, the strength of this joint must be tested to ensure the operational safety of the heavy equipment. This study evaluates the mechanical characteristics of a dissimilar weld joint between AISI 1045 and AISI 4340 materials using the Gas Metal Arc Welding (GMAW) method with a current of 90 Amperes and a voltage of 19 V and varying filler metals: ER70S-6 and ER110S-G. Tensile test specimens were prepared in accordance with the ASTM E8/E8M-13a standard, featuring a length (L) of 50 mm and a diameter (D) of 12 mm. The welded samples subsequently underwent hardness testing using the Vickers method. Test results indicate that samples using ER70S-6 filler metal exhibited an average tensile strength of 544 N/mm2 and a yield strength of 484 N/mm2. Meanwhile, samples using ER110S-G filler metal showed an average tensile strength of 766 N/mm2 and a yield strength of 613 N/mm2. Hardness test results for the ER70S-6 samples showed average values ​​of 279 HV in the AISI 1045 Heat-Affected Zone (HAZ), 358 HV in the AISI 4340 HAZ, and 167 HV in the weld metal. Conversely, the ER110S-G samples recorded average hardness values ​​of 238 HV in the AISI 1045 HAZ, 383 HV in the AISI 4340 HAZ, and 280 HV in the weld metal. In conclusion, the ER110S-G filler metal resulted in a greater increase in both tensile strength and joint hardness compared to ER70S-6. This condition is driven by the characteristics of ER110S-G as a high-strength, low-alloy (HSLA) steel weld metal containing nickel (Ni), chromium (Cr), and molybdenum (Mo). The combination of these alloying elements produces a solid solution strengthening mechanism that results in a significantly more robust weld metal matrix structure.
Co-Authors Abd. Rasyid Syamsuri Abdul Choliq Abdul Choliq Abdul Mufid Ade Irawan Ade, Ade Saputra Adria Wicaksono Agis Permana Ahmad Muhajir Aji, Ari Budi Prastya Aldi, Muhamad Alvian Harris Gita Purnama Arbi Dimyati arif Arif Harnowo Sidhi Bayu Eko Cahyono Fajar Haetommy Farid Wazdi Fifit Astuti Gunawarman Hasky Bambang Kurniawan Hilmala Nurmualimah Ismiarti, Ismiarti Jefri Purnawan Jon Affi, Jon Jonatan Hutapea Kusdi Prijono Lucia Rita Indrawati M Mukhlis Nasrulloh Mahmudi, Ahmad Mohammad Arif Muhamad Cahyadi Muhammad Rio Ferdiansyah Muhammad Syahrul Muliyadi Murni Handayani NURJAYA NURJAYA, NURJAYA Nurreni Irawati Oky Supriadi Putut Har Riyadi Ratna Ibrahim Reson Wibowo, Rohmad Salam, Rohmad RR. Ella Evrita Hestiandari Setiyono, Endro setyowati, agustina dyah Simbolon, Kiki Tristiawanti Siregar, Ansor Salim Suhendi Suhendi sulanjari Syaiful Arif Vikri Okta Yulianto Wahyudin, Muhammad Ali Wicaksana, Ilyas Rasyid Yamin, Muhamad Miftahul Yodhi Miftachul Hadi Yuli Yetri Zulaikhah, Siti Rahmawati