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All Journal International Journal of Public Health Science (IJPHS) Reaktor BULETIN OSEANOGRAFI MARINA BERKALA FISIKA SAINS DAN MATEMATIKA JURNAL KIMIA SAINS DAN APLIKASI JURNAL SISTEM INFORMASI BISNIS Jurnal Sains Materi Indonesia YOUNGSTER PHYSICS JOURNAL Jurnal Riset Kimia JURNAL KESEHATAN LINGKUNGAN (Journal of Environmental Health) Jurnal Ilmiah Arena Tekstil Jurnal Biodjati Indonesian Journal of Chemistry Journal of Physics and Its Applications Buletin Anatomi dan Fisiologi (Bulletin of Anatomy and Physiology) Indonesian Journal of Medicine Jurnal Fisika Indonesia ASEAN Journal of Chemical Engineering Jurnal Pasopati : Pengabdian Masyarakat dan Inovasi Pengembangan Teknologi Jurnal Cahaya Mandalika Greensphere: Journal of Environmental Chemistry Makara Journal of Science Berita Kedokteran Masyarakat Riwayat: Educational Journal of History and Humanities Biosaintifika: Journal of Biology & Biology Education Inovate : Jurnal Ilmiah Inovasi Teknologi Informasi Scientific Contributions Oil and Gas
Agus Subagio
Department Of Physics, Faculty Of Science And Mathematics, Universitas Diponegoro, Semarang
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Nursing Physics Public Health Social Sciences

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Analisis Kebutuhan Sumber Daya dan Infrastruktur dalam Pengembangan Rencana Pengelolaan Sekolah yang Berkelanjutan Subagio, Agus; Yani. T, Ahmad
Jurnal Cahaya Mandalika ISSN 2721-4796 (online) Vol. 3 No. 3 (2022)
Publisher : Institut Penelitian Dan Pengambangan Mandalika Indonesia (IP2MI)

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Pengelolaan sekolah yang berkelanjutan merupakan aspek penting dalam menjaga keberlanjutan pendidikan di era modern. Artikel ini bertujuan untuk menganalisis kebutuhan sumber daya dan infrastruktur dalam pengembangan rencana pengelolaan sekolah yang berkelanjutan. Metode penelitian yang digunakan adalah kualitatif dengan pendekatan studi literatur dan library research. Studi ini menyelidiki berbagai sumber daya yang diperlukan untuk mengembangkan rencana pengelolaan sekolah yang berkelanjutan, serta infrastruktur yang mendukung implementasinya. Hasil analisis menunjukkan bahwa kebutuhan sumber daya untuk pengelolaan sekolah yang berkelanjutan meliputi tenaga pendidik yang berkualitas, sarana dan prasarana yang memadai, serta kurikulum yang relevan dengan kebutuhan zaman. Selain itu, infrastruktur yang diperlukan mencakup fasilitas pendidikan yang ramah lingkungan, teknologi informasi yang canggih, dan sarana transportasi yang memadai bagi siswa dan tenaga pendidik. Penelitian ini juga mengidentifikasi beberapa tantangan yang dihadapi dalam memenuhi kebutuhan sumber daya dan infrastruktur untuk pengelolaan sekolah yang berkelanjutan, termasuk keterbatasan anggaran, kurangnya akses terhadap teknologi, dan perubahan kebijakan pendidikan. Oleh karena itu, kesimpulan dari studi ini menekankan pentingnya dukungan pemerintah, keterlibatan masyarakat, dan kerjasama antarstakeholder dalam mengembangkan rencana pengelolaan sekolah yang berkelanjutan guna meningkatkan mutu pendidikan di masa depan.
Pemanfaatan Limbah Ban Bekas untuk Sintesis Nanokomposit MnO2/C dengan Metode Hidrotermal sebagai Material Superkapasitor Adithia, Rizky Putra; Muckharom, Ahmad Ali; Ditalistya, Tabah; Karimah, Putri Diah Wahyu; Efiyanti, Lisa; Subagio, Agus
Jurnal Riset Kimia Vol. 15 No. 2 (2024): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v15i2.682

Abstract

Activated carbon from waste tires is used as MnO2 metal oxide doping in making MnO2/C-based nanocomposites into high-density and environmentally friendly supercapacitor electrodes. The MnO2/C nanocomposite synthesis process was carried out using the hydrothermal method by varying the mass of activated carbon by 1.25 g, 2.5 g and 3.75 g to determine the optimum results. Based on the results of research that has been carried out, it shows that MnO2/C can be used as a high density supercapacitor electrode. This is in accordance with the XRD test results which show that the MnO2 nanocomposite with the addition of C was successfully synthesized and has an orthorhombic crystalline phase. The SEM test results show that the material has almost the same morphology, namely many protrusions which make each particle have high roughness. The most optimal results were obtained from the MnO2/C-50 variation because it has the highest C element content, namely 39.93%, so it has the highest capacitance value of 5.791 f/g during the CV test. The GCD test shows that electrodes with a carbon variation of 2.5 g have a much longer and constant charge-discharge measurement time. In the EIS test, this variation shows a resistance value that is not too high and not too small, materials that have good storage capacity or capacity have moderate resistance.
Analysis Effect of Nano Chitosan Coating on The Quality of Shallot Bulbs (Allium ascalonicum L. var. Bauji) Puspita, Della Widya; Prihastanti, Erma; Suedy, Sri Widodo Agung; Subagio, Agus
Jurnal Biodjati Vol 7 No 1 (2022): May
Publisher : UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/biodjati.v7i1.14900

Abstract

Shallots are bulb-shaped commodities that are difficult to maintain in new conditions because they are easily damaged. An effective effort to prevent deterioration of food quality during storage is by coating it using nano chitosan. The effectiveness of nano chitosan is influenced by particle size which related to the ratio of chitosan and STPP (sodium tripolyphosphate). This study aimed to determine the effect of nano chitosan coating with the addition of different ratios of chitosan and STPP and the appropriate ratio of chitosan and STPP on nano chitosan as a coating to maintain the quality of shallot bulbs (Allium ascalonicum L. var. Bauji). This study used a completely randomized design (CRD) method with four treatments and five replications. The treatments of this research were P0= Control, PI= Nano chitosan ratio of chitosan: STPP 1:3, P2= Nano chitosan ratio of chitosan:STPP 1:4, and P3= Nano chitosan ratio of chitosan:STPP 1:5. The variables of this study were the percentage of damage, the percentage of diameter shrinkage, weight loss, color, hardness, and moisture content. Data were analyzed using the ANOVA test and continued with the DMRT test. The application of nano chitosan coating on shallot bulbs could reduce damage, shrinkage of tuber diameter, weight loss, color, hardness, and decrease in water content better than the control treatment. The best results were shown by treatment P3 (1:5) with a percentage of damage of 8%, diameter shrinkage of 20.20%, weight loss of 18.40%, total color change of 54.45, hardness of 226.23 N, and a decrease in water content of 4.65% at the final water content of 79.09%.
High Thermal Stability Silica Nanofluids For EOR in Sandstone Reservoir Subagio, Agus; Rowi, Khasan; Ngadiwiyana; Taufiq, Heydar Ruffa; Azis, Muhammad Mufti; Prasetiyo, Bayu Dedi; Sitompul, Victor; Paryoto, Sumadi; Winata, Denie Tirta; Diharja, Tino; Yutaka, Michael Arya; Syarifudin, Abimanyu Putra; Firmansyah, Wahyu; Koestono, Hary
Scientific Contributions Oil and Gas Vol 49 No 1 (2026)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v49i1.2000

Abstract

The development of silica nanofluids for enhanced oil recovery (EOR) has gained significant attention. However,  their application is limited bypoor stability under high temperature, and high salinity conditions. Our previous studies demonstrated that using the anionic surfactant alpha olefin sulfonate (AOS) combined with the co surfactant disodium laurent sulfosuccinate (DLS) at consentrations of 0.3% AOS and 0.3% DLS significantly enhanced thermal stabilility, reduced IFT, decreased wettability, and increased incremental oil recovery. This study reports a one step synthesis method for preparing silica nanofluids using hydrophilic colloidal nano silica (CNS) stabilized with the AOS and DLS at surfactant concentrations above 0.3%. Nanofluids were formulated with formation water from a reservoir in Sumatra, Indonesia. We systematically evaluated the effects of AOS-DLS concentrations on the thermal stability, turbidity, interfacial tension (IFT), wettability, filtration test, and core flooding performance. The optimized formulation of stable silica nanofluids for EOR applications under reservoir relevant conditions was also systematically evaluated. The silica nanofluid (0.3% AOS + 0.3% DLS) exhibited more than 3 months of stability at 60 °C. It also had a low contact angle of 13.88 ͦ and a reduced IFT of 6.3x10-1 mN/m. The filtration ratio was 1.2. Spontaneous imbibition resulted in a recovery factor (RF) of 59%. Core flooding analysis yielded an incremental RF of 12.9% of the OOIP. These results demonstrate the synergistic role of silica nanoparticles and surfactants in improving nanofluid stability, reducing IFT, and enhancing oil recovery. This supports their potential application in chemical flooding for sandstone reservoirs.
Synergy of Nano Silica and Anionic Surfactant Fluid as Chemical Enhanced Oil Recovery Rowi, Khasan; Subagio, Agus; Ngadiwiyana; Taufiq, Heydar Ruffa; Azis, Muhammad Mufti; Prasetiyo, Bayu Dedi; Sitompul, Victor; Paryoto, Sumadi; Winata, Denie Tirta; Diharja, Tino; Yutaka, Michael Arya; Syarifudin, Abimanyu Putra; Firmansyah, Wahyu; Koestono, Hary
Scientific Contributions Oil and Gas Vol 48 No 4 (2025)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v48i4.1951

Abstract

Silica nanofluids attract significant attention for enhanced oil recovery (EOR) applications due to their ability to alter rock wettability. However, silica nanofluids exhibit limitations in thermal stability. The addition of anionic surfactants aims to overcome these limitations. The synergisticAnionic surfactants are added to address the thermal stability issues of silica nanofluids. The synergy interaction between silica nanoparticles (SNPs) and anionic surfactants enhances  wettability alteration, reduces interfacial tension (IFT), improves thermal stability, and increasing oil recovery. This study investigates the synergistic effects of SNPs, alpha olefin sulfonate (AOS) surfactant, and disodium laureth sulfosuccinate (DLS) co-surfactant in nanofluid formulations applied to sandstone reservoirs. Laboratory experiments employ colloidal nano silica with two particle sizes, 8 nm (SNP-01) and 3 nm (SNP-02), combined with AOS-DLS anionic surfactants at various concentrations . The study showed that the silica nanofluid remains stable for up to 3 months at temperatures below 80°C for both SNP types at a concentration of 0.1% with surfactant concentrations 0.3% AOS and 0.3% DLS in  3% brine solution. The addition of SNPs decreases the contact angle, whereas surfactants do not significantly affect the contact angle; however, surfactant effectively reduce the IFT, while  nano silica shows minimal influence on IFT values. Core flooding analysis showed that the SNP-02 nanofluid produced the highest recovery factor of 12.1% OOIP. Futhermore, SEM analysis showed that silica nanofluid injection removes surfactant impurities and enhances rock porosity.
Co-Authors Adi Darmawan Adithia, Rizky Putra Agung Cahyono Agus Setyawan Ahmad Aviv Mahmudi Alfatinnisa, Zalfa Andriyan, Mohammad Wahyu Anghistra, Pradipta Ditya Annisa Fadillah Antari, Arlita Leniseptaria Ari Udijono Aslam Fatkhudin Awal Prasetyo Bagoes Widjanarko Bayu Surarso Della Widya Puspita Diharja, Tino Ditalistya, Tabah Djalal Er Riyanto Dwi Sutiningsih Dwiantoro, Luky Edy Supriyanto Efiyanti, Lisa Eko Hidayanto Endah Puji Astuti, Endah Puji Eny Enawaty Erma Prihastanti Febio Dalanta Galih Priambodo, Galih Gufron, Ahmad Hadi Endrawati Halida Halida Hardhono Susanto Hella Arofah Hendri Widiyandari Hendri Widiyandari Hendri Widyandari Heri Sutanto Hermin Pancasakti Kusumaningrum Horasdia Saragih I Gusti Ngurah Antaryama I Nurhasanah Iis Nurhasanah Imam Misbach Indah Saraswati Indras Marhaendrajaya Indri Yuliastuti, Indri Jatmiko Endro Suseno Jaya, La Ode Irman Joko Sudarto Karimah, Putri Diah Wahyu Khasan Rowi Khasan Rowi Koestono, Hary M F Taftiari M. Imam Taufiq Maman Budiman Maman Budiman Marinu Waruwu Mashuri, Chamdan Mateus Sakundarno Adi, Mateus Sakundarno Maulidanir Rohman Mentari, Alfitra Akbar Bara Mentari Metri Setyaningsih Metri Setyaningsih Moch. Abdul Mukid Moehamad Barmawi Moehammad Barmawi Mohammad Muhriz Muckharom, Ahmad Ali Muhammad Iskandar Zulkarnain Muhammad Mufti Azis Muhammad Nur Muhammad Zainuri Mursid Raharjo Musni Ahyani Musni Ahyani, Musni Mustafid Mustafid Ngadiwiyana Ngadiwiyana M.Si. S.Si. Ngurah Ayu Ketut Umiati Nissa Kusariana Nurwijayanti Pardoyo Pardoyo Pardoyo, Paryoto, Sumadi Pepen Arifin Pepen Arifin Prasetiyo, Bayu Dedi Priyono Priyono Priyono, Puspita, Della Widya R Hidayatuloh R. Yudianti Redemtus Heru Tjahjana Rike Yudianti Rike Yudianti Rini Budihastuti Ririn Sulpiani Rizky Bimanda Sakti Romi Buana Puja Pangestu Saputra, Muhammad Ragil Satriyo Adhy Silviana Silviana Siti Nandiyah, Siti Sitompul, Victor Skolastika Dara Sabatini Sri Eny Suharini, Sri Eny Sri Isdadiyanto Sri Widodo Agung Suedy Stefani Candra Firmanti Subhan Subhan Subhan, Sudarno Sudarno Sudarto, Joko Sukirno Sukirno Sukirno Sukirno SULISTIYANI SULISTIYANI Sunarno Sunarno Syarifudin, Abimanyu Putra Tatang Wahyudi Tatang Wahyudi, Tatang Taufiq, Heydar Ruffa Tri Windarti Udi Harmoko Vincensius Gunawan S.K. WAHYU FIRMANSYAH Weni Safitri Widianingsih Widianingsih Widiastuti Samekto Winata, Denie Tirta Yani. T, Ahmad Yohana Maya Kartikaratri Yundari, Yundari Yutaka, Michael Arya Yuvita Muliastuti