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All Journal Komunikasi Fisika Indonesia Jurnal Pilar Sains JURNAL FISIKA Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam SEMIRATA 2015 Journal of Aceh Physics Society Jurnal Litbang Industri Jurnal Edu Research Riau Journal of Empowerment Jurnal Fisika Indonesia Journal of Technomaterial Physics Jurnal Litbang Industri Science, Technology, and Communication Journal
Rakhmawati Farma
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Agriculture, Biological Sciences & Forestry Astronomy Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Physics Social Sciences

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Analysis of shallow well depth prediction: A study of temporal variation of GRACE satellite data in Tampan District-Pekanbaru, Indonesia Pertiwi, Meryati; Muhammad, Juandi; Farma, Rakhmawati
Science, Technology and Communication Journal Vol. 1 No. 1 (2020): SINTECHCOM Journal (October 2020)
Publisher : Lembaga Studi Pendidikan and Rekayasa Alam Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59190/stc.v1i1.24

Abstract

Urban geographic areas that are far from surface water resources cause the availability of groundwater to be limited. Groundwater is the main source of water for urban communities today, however, groundwater does not always exist. Groundwater search continues with the old method which takes a long time. In this study, a groundwater search using a satellite imaging method is proposed to create work effectiveness and a faster time. This study aims to analyze the underground water reservoir in Tampan District using GRACE satellite data in the form of variations in total water storage and correlated with in-situ data. The method used is in the form of total water storage variation modeling in the form of multiple linear regression equations. Parameters that influence the modeling of total water storage variations are rainfall, evaporation, and run-off. The classical assumption test and model feasibility test are used to determine the parameter accuracy in data estimation. The results showed that the multiple linear regression model passed the assumption test and the model feasibility test. The value of the run-off coefficient is greater than the value of the precipitation coefficient. This is because Tampan District has sandy clay rock types and decreasing green open land, so the potential for groundwater loss in the Tampan District area is 1,180,326.63 m3/month.
Design and fabrication of chitin-derived electrodes with optimization of temperature carbonization for energy storage in supercapacitors Farma, Rakhmawati; Meisya, Meisya; Apriyani, Irma; Awitdrus, Awitdrus; Taer, Erman
Science, Technology, and Communication Journal Vol. 5 No. 3 (2025): SINTECHCOM Journal (June 2025)
Publisher : Lembaga Studi Pendidikan dan Rekayasa Alam Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59190/stc.v5i3.310

Abstract

Supercapacitors have become one of the potential solutions for efficient energy storage, and the development of carbon-based electrodes from biomass has received increasing attention due to their sustainability. This study aims to produce carbon electrodes from crab shells (CS) as biomass materials by optimizing the carbonization process with temperature variations of 600°C, 700°C, and 800°C for supercapacitor cell applications. Material characterization shows that the carbonization temperature of 700°C produces carbon electrodes with optimal semicrystalline structures and mesopore dominance, which supports efficient ion diffusion. The CS-700 carbon electrode showed the highest specific capacitance of 118.84 F/g in cyclic voltammetry tests with 1 M H2SO4 electrolyte. These results indicate that carbonization at 700°C provides the best electrochemical performance, making it the optimal condition for developing efficient and environmentally friendly mud crab shell biomass-based electrodes for supercapacitor cell applications.
Argon plasma ionization in thermodynamic equilibrium with continuity equation Kasri, Anshori; Saktioto, Saktioto; Farma, Rakhmawati; Rini, Ari Sulistyo; Erwin, Erwin; Awitdrus, Awitdrus
Science, Technology, and Communication Journal Vol. 5 No. 3 (2025): SINTECHCOM Journal (June 2025)
Publisher : Lembaga Studi Pendidikan dan Rekayasa Alam Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59190/stc.v5i3.318

Abstract

Local thermodynamic equilibrium is a foundational concept in plasma physics and heat transfer, describing a state where each small region of a system can be treated as if it is in thermodynamic equilibrium, even if the whole system is not. However, achieving accurately perfect thermodynamic equilibrium conditions in real-experiments is often challenging. It often struggles for understanding phenomena like excited states or specific Arrhenius-driven reactions. As a result, the advantages of plasma modeling with simplifications can sometimes overshadow the disadvantages of experiments. This study simulated the ionization process of argon plasma using the 4th order Runge-Kutta numerical method. The simulation, initiated with initial densities before the simulation is run, each of them is electrons 2.6 × 1018 m-3, neutral argon (Ar) 2.6 × 1018 m-3, positive argon ions (Ar+) 2.6 × 1018 m-3, and positive diatomic argon ions (Ar2+) 2.6 × 1018 m-3, successfully obtained reaction rate equilibrium data at the 625th iteration. The final densities observed were 2.46 × 1018 m-3 for electrons, 2.27 × 1018 m-3 for neutral argon, 6.4 × 1015 m-3 for Ar+, and 4.34 × 1017 m-3 for Ar2+. These results show the equilibrium reaction rate in argon plasma which provides information that density of electron and Ar+ species show a decreasing trend while density of Ar and Ar2+ species shows an increasing trend which are the result of ionization and recombination processes in the entire plasma system.
Co-Authors Ade Nur Indah Lestari Agustino Agustino Agustino Agustino Agustino Agustino Aldes Lesbani Alexander Nasution Amalia Apriliani Putri Amiruddin Supu Apriwandi Apriyani, Irma Aria Yunita Aria Yunita Arsyad, Fitri Suryani Awaludin Martin Awitdrus Awitdrus, Awitdrus Daulay, Siti Rahma Decha Apriliany Suwandi Dedi Setiabudidaya Desmagrini Desmagrini Desy Veyka Rukmana Dewi Mulfida Eko Nur Arif Erin Mazelly Hutapea Erman Taer Erwin Erwin Fitri Wahyuni Haliza Putri Hardanto, Lilik Tri Idha Royani Ikhsan Rahman Husein Inrizky Domy Muchammadsam Irma Apriyani Irma Apriyani Iwantono Iwan Barnawi Juandi Juandi Julnaidi, Julnaidi Karina Silviani Kasri, Anshori Kresna, Pharada Liasari, Beta Riana Lilik Tri Hardanto Meisya, Meisya Melda Oktaviandari Melinda Vivi Miftah Ainul Mardiah Minarni Minarni Mohamad Deraman, Mohamad Muhammad Nasir Muhammad Nasir Mulfida, Dewi Novi Yanti Nurlisa Kartikasari Nursyafni, Nursyafni Nurul Tania Nur’aini, Siti Pertiwi, Meryati Pharada Kresna Purba, Cenora Evelynza Rahmi Dewi Raysa Fadillah Reeky Fardinata Rika Taslim Rika Taslim Rini, Ari Sulistyo Rinti Rahimah Hasibuan Risfidian Mohadi Saktioto Saktioto Sinta Afria Ningsih Soerya, Balada Sugiyanto Sugiyanto Vepy Asyana Vepy Asyana Widarti ' Yanuar Hamzah Yurike Asra Zurya Hanifa