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All Journal Cakrawala Pendidikan JURNAL TEKNOLOGI LINGKUNGAN The 2nd Proceeding Indonesia Clean of Corruption in 2020" Aquasains : Jurnal Ilmu Perikanan dan Sumberdaya Perairan International Journal of Research in Community Services JURNAL SAINS DAN TEKNOLOGI MARITIM Prosiding University Research Colloquium Dharma Sevanam : Jurnal Pengabdian Masyarakat Jurnal Perikanan Scientific Contributions Oil and Gas LEMBARAN PUBLIKASI MINYAK DAN GAS BUMI (LPMGB)
Subiyanto Subiyanto
Universitas Negeri Malang
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Study On Components Rating Of Gasoline Engine As A Performance Quality Indicator Of Lemigas Formulated Api Sl Lubricant Setyo Widodo; Shinta Sari H; Catur Yuliani R; Subiyanto Subiyanto
Scientific Contributions Oil and Gas Vol 33 No 3 (2010)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.33.3.825

Abstract

Poor lubrication may cause wear on the surface moving parts of engine components such as bearings due to the metal-to-metal contact. Engine components utilized on the road-test of gasoline engine’s lubricating oil API SL showed wear and tear on some parts of them. The sum of wear occurred during the road test were varied. Therefore, an analysis of wear quantity of engine’s components was a necessity in order to get information about lubrication condition on engine. Analysis of wear was conducted by components’ rating based on the standard specifications set out for performance level of lubricant oil API SL and ILSAC GF-3 (SNI 06-7069-2005). Analysis based on Seq. IIIF showed that average value of the piston skirt varnish is 10, low temperature viscosity is 4673 cP, and cam wear lifter is 0.002 mm. It was also showed that the minimum kinematics viscosity increase was managed to be stay-in-grade. Analysis based on Seq. IVA showed that the average value of cam wear is 0.0015 mm. Analysis based on Seq. VII showed that the value of bearing weight loss was 0.010 g and there was no deposit at high temperatures. Shear stability analysis based on Seq. VIII showed that the viscosity of lubricant oil is still in the range of allowed values.
Penerapan Teknologi IoT dan PLTS untuk Optimalisasi Nutrisi dan Kontrol Kebun Hidroponik Desa Bawang Faiq Mananul Faqih; Subiyanto Subiyanto; Mario Norman Syah; Aburrakhman Hamid Al-Azhari; Rizky Ajie Aprilianto; Aisya Fathimah; Wildatul Afiah; Ade Yusuf; I Gede Bagus Jayendra; Aura Rizqia Zahra; Nektar Cahayasabda; Apriansyah Wibowo
Dharma Sevanam : Jurnal Pengabdian Masyarakat Vol 5 No 1 (2026): Juny 2026
Publisher : IAHN Gde Pudja Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53977/sjpkm.v5i1.3277

Abstract

Energy efficiency and precise nutrient delivery are crucial aspects of modern hydroponic farming practices. Reliance on manual monitoring and conventional energy supply often leads to resource wastage and reduced productivity. In line with the advancement of precision agriculture technologies, this study aims to develop an automated nutrient monitoring and control system based on the Internet of Things (IoT), supported by renewable energy, to promote energy conservation. The system is designed using an ESP32-S3 microcontroller, TDS, temperature, and humidity sensors, as well as peristaltic pumps that operate automatically according to threshold values and plant growth phases. The IoT subsystem is powered by four solar panels with a total capacity of 80 Wp. Implementation was carried out at Atish Hidrofarm Hydroponic Garden, Bawang Village, and evaluated through the monitoring of nutrient, temperature, and humidity parameters. The results showed that the system was able to maintain nutrient stability within the optimal concentration range while reducing energy requirements for monitoring compared to conventional methods. The application of solar PV as a backup power source demonstrates strong potential as an integrated technological model that not only supports resource conservation but can also be replicated across various scales of hydroponic farming in regions with low electricity supply reliability.
Evaluasi Metode Estimasi Viskositas Kinematik Campuran Biner Base Oil dan Aditif Viscosity Modifiers (VMs) Setyo Widodo; Nelson Saksono Saksono; Subiyanto Subiyanto
Lembaran publikasi minyak dan gas bumi Vol 45 No 1 (2011)
Publisher : BBPMGB LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/LPMGB.45.1.682

Abstract

Penyusunan formula minyak lumas selalu melibatkan pencampuran base oil dan aditif melaluitahapan estimasi dan formulasi skala laboratorium, dilanjutkan dengan produksi skala komersial.Parameter kunci dalam penyusunan formula adalah viskositas kinematik yang nilainya dapatdihitung secara teoretis dan pengujian laboratorium. Beberapa metode estimasi viskositas campuranyang dikenal antara lain persamaan Refutas, metode Wright, dan metode yang dikembangkandan digunakan dalam American Society for Testing and Material (ASTM D 7152).Penelitian ini dilakukan untuk mempelajari akurasi ketiga metode tersebut dalam memprediksiviskositas kinematik campuran biner base oil dan aditif. Sampel campuran biner tersusun daridua jenis base oil mineral produksi PT Pertamina (Persero) dan aditif viscosity modifiers (VMs)produksi Lubrizol yang divariasikan pada kisaran konsentrasi 5-30 % berat. Nilai viskositaskinematik diukur pada temperatur uji 40 dan 100oC menggunakan cannon automatic viscometerseries 2000 (CAV 2000) dengan mengacu pada metode uji ASTM D 445. Evaluasi data dilakukanuntuk mendapatkan nilai persen average absolute deviation (%AAD) sebagai indikator akurasihasil estimasi dari setiap metode dibandingkan dengan data empiris.Hasil penelitian menunjukkan bahwa nilai %AAD pada 24 data uji dari 12 sampel campuranbiner dan temperatur uji 40oC adalah 10,56 %, lebih rendah dibandingkan persamaan Refutas danmetode ASTM, yaitu 41,19 dan 41,25 %. Pada temperatur uji 100oC nilai %AAD metode Wrightadalah 15,03 %, lebih rendah daripada persamaan Refutas dan metode ASTM yaitu 39,15 dan39,43 %. Berdasarkan hasil tersebut, dapat disimpulkan bahwa metode Wright memberikan nilaiestimasi yang lebih akurat dibandingkan dengan persamaan Refutas maupun metode ASTM.
Co-Authors Aburrakhman Hamid Al-Azhari Ade Yusuf Aisya Fathimah Aminuyati Apriansyah Wibowo Ariana Oktavia Aura Rizqia Zahra Catur Yuliani R Evi Liviawaty Faiq Mananul Faqih Gunarto Gunarto I Gede Bagus Jayendra Iskandar Iskandar Jawade Hafidz Mario Norman Syah Mohammad Fadhli Ahmad Nabil Juwatiar Saifullah Nektar Cahayasabda Nelson Saksono Nelson Saksono Saksono Oktavia Laelatul Azizah Paramita Nuraini Rizky Ajie Aprilianto Rusky Intan Pratama Setyo Widodo Shally Auliyatul Hakim Shinta Sari H Sudradjat Supian Triyani Hendrawati Wildatul Afiah Yuyun Hidayat