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All Journal SemanTIK : Teknik Informasi JTERA (Jurnal Teknologi Rekayasa) Mawaizh : Jurnal Dakwah dan Pengembangan Sosial Kemanusiaan G-Tech : Jurnal Teknologi Terapan Melo: Jurnal Studi Agama-agama Automotive Experiences Jurnal Teknik Mesin Mechanical Xplore Komunikasia: Journal of Islamic Communication and Broadcasting PESHUM Spektrum Industri AKSIOMA
Safril Safril
Jurusan Teknik Mesin Politeknik Negeri Padang
Religion Aerospace Engineering Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Social Sciences Other

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Analisis Kesalahan Siswa Kelas VIII A SMP Negeri 1 Sindue Tombusabora pada Hasil Ulangan Harian Materi Prisa Safril, Safril; Sugita, Gandung; Pathuddin, Pathuddin; Murdiana, I Nyoman
Aksioma Vol. 15 No. 1 (2026): AKSIOMA
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/aksioma.v15i1.4478

Abstract

Tujuan dari penelitian ini yaitu untuk mendeskripsikan kesalahan yang dilakukan oleh siswa kelas VIII A SMP Negeri 1 Sindue Tombusabora, tahun ajaran 2024/2025 pada hasil ulangan harian materi prisma. Jenis penelitian ini adalah penelitian deskriptif dengan pendekatan kualitatif. Subjek penelitian ini adalah 2 siswa kelas VIII A SMP Negeri 1 Sindue Tombusabora. Dua orang siswa yang dipilih sebagai subjek penelitian terdiri dari dua orang siswa yang memiliki nilai paling rendah. Teknik pengumpulan data yang digunakan adalah dokumentasi hasil ulangan harian dan wawancara. Hasil penelitian ini menunjukkan kesalahan-kesalahan yang dilakukan siswa berdasarkan tahapan Kastolan: (1) Kesalahan Konseptual, Subjek TA dan RI tidak memahami soal dengan baik dan tidak memilih rumus dengan benar. (2) Kesalahan Prosedural, Subjek TA dan RI ditandai dengan ketidaksesuaian langkah-langkah penyelesaian soal dan salah dalam menentukan langkah-langkah penyelesaian soal dikarenakan kesalahan dalam memilih rumus. (3) Kesalahan Teknik, Subjek TA dan RI salah dalam operasi hitung, salah dalam menentukan jawban akhir atau tidak menentukan jawaban akhir. Kata kunci: Analisis Kesalahan,Ulangan Harian Prisma segitiga, Tahapan Kastolan.
Effect of SiO₂ Nanoparticle Dispersion on The Stability and Thermal Conductivity of Polyvinyl Ether-Based Nanolubricant Safril, Safril; Solih, Edwin Sahrial; Gurning, Ridho Hans; Shalihah, Adinda Rahmah; Arohman, Abdul Wahid
G-Tech: Jurnal Teknologi Terapan Vol 10 No 1 (2026): G-Tech, Vol. 10 No. 1 January 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v10i1.8987

Abstract

Heat transfer efficiency in lubrication systems can be achieved by utilising nanolubricants by dispersing nanoparticle additives into pure lubricants to increase nanolubricant stability and thermal conductivity. This study aims to investigate the effect of silicon dioxide (SiO₂) nanoparticle dispersion in polyvinyl ether (PVE)-based lubricants on the stability and thermal conductivity characteristics of nanolubricants. SiO₂/PVE nanolubricant was prepared using a two-step method with a volume concentration of 0.007%. Stability evaluation was carried out through UV–Vis spectrophotometry testing over a period of 30 days. Thermal conductivity was measured using KD2-Pro at a temperature range of 30 ℃ to 80 ℃. The results of the study showed that SiO₂/PVE was declared stable after 144 hours with an absorbance of 80%. Thermal conductivity characteristics decreased with increasing temperature, and the nanolubricant increased compared to PVE lubricants. The maximum increase in thermal conductivity was 2.72% compared to the pure lubricant, and at a test temperature of 30 °C, SiO₂/PVE was compared to SiO₂/corn oil, SiO₂/paraffin oil, SiO₂/sunflower SiO₂/oil, and SiO₂/soybean oil; the results showed an increase in thermal conductivity of 66.69%, 80.63%, 67.70%, and 46.45%, respectively. The thermal conductivity behaviour tends to increase when SiO₂ nanoparticles are dispersed into the pure lubricant, compared to the pure PVE lubricant and previous studies. These findings indicate that SiO₂/PVE nanolubricant produces a significant increase in thermal conductivity, resulting in accelerated heat transfer, reduced friction and wear, and ultimately leading to increased energy efficiency and improved overall system performance.
The Effect of Compressor Speed ​​on Residential Air Conditioning Systems Using R407c and R32 Refrigerant SAFRIL, SAFRIL; Wan Hamzah, Wan Azmi Bin; Wei, Teh Ting; Gurning, Ridho Hans; Sukarman, Sukarman; Khoirudin, Khoirudin
Jurnal Teknik Mesin Mechanical Xplore Vol. 6 No. 2 (2025): Jurnal Teknik Mesin Mechanical Xplore (JTMMX)
Publisher : Mechanical Engineering Department Universitas Buana Perjuangan Karawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36805/g02r6b73

Abstract

The demand for residential air conditioning (RAC) systems is expected to increase in the future owing to rising ambient temperatures resulting from global warming. Therefore, it is important to develop and study refrigerants that can improve energy efficiency and thermodynamic performance. This study compares R32 and R407c refrigerants in RAC systems, with an emphasis on the coefficient of performance (COP) and cooling capacity. The research methodology used an experimental approach by testing compressor speeds of 2400, 2700, and 3000 rpm. Based on the test results, R32 consistently performed better than R407c at all compressor speed variations. The COP and cooling capacity of R32 increased significantly by 15.53% and 35.90%, respectively. The stability of R32 performance operated at different compressor speed variations showed an increase in operational adaptability. Finally, R32 was proven to be a more effective and efficient refrigerant than R407c in the RAC system.
Co-Authors Abdul Wahid Arohman Amir Amir Anwar Ilmar Ramadhan Aulia Nanda, Rizki Azmi, Wan Hamzah B. Handoko Purwojatmiko Chayatunnufus, Tasya Darius, Gayus Dianasanti Salati Dodi Mulyadi Dodi Mulyadi Furkan Furkan Gandung Sugita Golok Jaya, La Ode Muhammad I Nyoman Murdiana Imansuri, Febriza Jumadil Nangi, Jumadil Khoirudin Khoirudin, Khoirudin LUKMAN, LUKMAN Mohd Zawawi, Nurul Nadia Pathuddin Patya, Dhea Intan Putri, Sekar Ridho Hans Gurning Shalihah, Adinda Rahmah Solih, Edwin Sahrial Sukarman Sukarman Sumasto, Fredy Taufiqur Rokhman, Taufiqur Tikamori, Ghazi Wan Hamzah, Wan Azmi Bin Wei, Teh Ting