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All Journal International Journal of Advances in Applied Sciences Jurnal MIPA CHEMISTRY PROGRESS Jurnal Neutrino : jurnal fisika dan aplikasinya Jurnal Pendidikan Fisika Indonesia JURNAL LPPM BIDANG SAINS DAN TEKNOLOGI Jurnal Penelitian Pendidikan IPA (JPPIPA) INDONESIAN JOURNAL OF APPLIED PHYSICS The Studies of Social Sciences Vivabio : Jurnal Pengabdian Multidisiplin Jurnal Ilmiah Sains
Pandara, Dolfie Paulus
Universitas Sam Ratulangi
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Environmental Science Materials Science & Nanotechnology Mathematics Physics Public Health Social Sciences

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Carbonized mangrove wood as photothermal material for solar water desalination Pandara, Dolfie Paulus; Unso, Kristina; Bobanto, Maria Daurina; Tamuntuan, Gerald Hendrik; Angmalisang, Ping Astony; Ferdy, Ferdy; Tiwow, Vistarani Arini; Kumaunang, Maureen
International Journal of Advances in Applied Sciences Vol 14, No 2: June 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijaas.v14.i2.pp542-551

Abstract

The investigation into the physical properties of carbonized mangrove wood (CMW) is essential for its development as an efficient solar heat absorber. This study explores the physical characteristics of CMW and its potential application in solar desalination. Initially, the mangrove wood was cleaned with running water, followed by ultrasonication at a frequency of 42 kHz in 96% ethanol for 5 minutes, and then heated at 125 °C for 2 hours. The carbonization process was conducted in a furnace for 1 hour at temperatures of 400, 500, and 600 °C. The physical properties of CMW were analyzed using an X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FTIR), energy dispersive spectroscopy, and scanning electron microscopy (SEM). The findings revealed the formation of a carbon structure at 2 theta angles of approximately 24.08, 23.26, and 23.16°, with carbon contents of 45.05, 36.86, and 39.37%, respectively. CMW was identified as a porous material, making it highly effective for sunlight absorption in seawater evaporation. The hydroxyl content within the CMW structure enhanced its water evaporation capabilities. In experimental investigations aimed at desalinating seawater, a 300-watt halogen lamp was positioned 15 centimeters above the CMW's surface, resulting in an evaporation rate of 5.33 kg.m-2.h-1. CMW shows significant promise as a solar evaporator.
Approximative Relationship Between The Energy Function (E) and Hubble Function (H) in Cosmology: Practical and Theoretical Analysis Sahroni, Taufik Roni; Pandara, Dolfie Paulus; Wibowo, Arnowo Hari; Alatif, Yahya Halim; Wardana, Febriansyah; Kasim, Mohd Shahir; Siagian, Ruben Cornelius
Jurnal Pendidikan Fisika Indonesia Vol 20, No 1 (2024)
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jpfi.v20i1.43488

Abstract

This research delves into the approximate relationship between the energy function (E) and the Hubble function (H) within cosmological. Utilizing the Friedmann equation, it establishes a link between the universe's scale factor and the Hubble function. Through Taylor series approximation, the study derives an approximation of the energy function, under specific assumptions and approximations. Asymptotic analysis investigates the behavior of variables y and s, shedding light on function limits and behaviors. The study incorporates an interactive 3D scatter plot visualization to elucidate the relationship between cosmological parameters and physical systems, aiding in a comprehensive understanding of dynamics. Practical recommendations emphasize increasing data points for accuracy and validating with observational data, while theoretical suggestions advocate exploring higher-order terms and considering additional physical factors.
Green conversion of red snapper fish scale-derived carbon dots and its absorption properties for solar thermal desalination Pandara, Dolfie Paulus; Tamuntuan, Gerald Hendrik; Bobanto, Maria Daurina; Ferdy, Ferdy
International Journal of Advances in Applied Sciences Vol 13, No 1: March 2024
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijaas.v13.i1.pp84-92

Abstract

Fisheries wastes have been used as precursors for the synthesis of carbon dots (CDs). These wastes are often converted using hydrothermal methods which require high temperature and pressure, leading to high production costs, especially for large-scale production. This study aims to innovate a low-cost synthesis method with the potential for large-scale production. Green conversion of CDs from red snapper fish scale waste was carried out using a combination of immersion method and ultrasonic wave treatment. The results showed that the products had an absorption peak at a wavelength of 404 nm and an energy bandgap of 2.7 eV. Excitation at 404 nm was associated with non-bonding n orbital to antibonding orbital ?* electronic transitions due to the presence of free electron pairs and related with carbon-nitrogen (C-N) bonds. The 2.7 eV energy bandgap was associated with the state of amine groups containing free electron pairs located on the surface of CDs as well as blue light emission at a wavelength of 460 nm when CDs were illuminated with ultraviolet light. Red snapper fish scale-derived CDs showed fluorescence characteristics and the presence of nitrogen elements, making them potential photothermal materials for solar-powered seawater desalination processes.
Simulasi Efek Konduktivitas Hidrolik pada Intrusi Air Laut Ferdy; Tirza Wungkana; Dolfie Paulus Pandara; Maria D. Bobanto; Hanny F. Sangian; Adey Tanauma; Seni H. Tongkukut; Hesky S. Kolibu
Jurnal Penelitian Pendidikan IPA Vol 11 No 4 (2025): April
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i4.5437

Abstract

This research has been conducted with the aim of simulating the process of seawater intrusion using SEAWAT software and assessing the factors causing seawater intrusion. In this simulation, variations in hydraulic conductivity and aquifer material types are explored to understand their impact on the distribution of water levels. The simulation results are presented in the form of simulated concentration plots used to visualize concentration distribution with color gradients reflecting changes in concentration values. Additionally, the direction of groundwater flow is represented by arrows, aiding in understanding the movement patterns of dissolved substances within the aquifer. Simulated head plots are created using colors and contour lines. The resulting simulated head plots depict changes in color and contour lines that represent variations in water levels throughout the aquifer. Color gradients from yellow to purple indicate a decrease in water levels, while contour lines indicate the direction of groundwater flow. Furthermore, changes in the shape of contour lines from straight to curved depict changes in the topography or hydrogeological characteristics within the aquifer. The simulations are carried out by considering changes in hydraulic conductivity and aquifer material characteristics. In the context of this research, hydraulic conductivity is considered a key factor influencing the movement of dissolved substances within the aquifer, and through this analysis, it is found that hydraulic conductivity significantly affects water level distribution and groundwater flow patterns.  
Sistem Monitoring Arus dan Tegangan Pada Panel Surya 50Wp Berbasis IoT Suoth, Verna Albert; Pandara, Dolfie Paulus; Kolibu, Hesky Stevy
Jurnal Ilmiah Sains Volume 26 Issue 1, April 2026
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jis.v26i1.64415

Abstract

The utilization of small-scale solar panels, particularly those with a capacity of 50 Wp, has become increasingly widespread in household systems and remote areas. However, the lack of adequate monitoring systems makes it difficult for users to identify actual panel performance, causing efficiency degradation to often go undetected at an early stage. This study aims to develop a current and voltage monitoring system for a 50 Wp solar panel based on the Internet of Things (IoT) that is capable of providing real-time performance data to support performance evaluation and more efficient energy management. The system was developed using current and voltage sensors, an ESP32 microcontroller, and a cloud-based IoT application for data visualization. The test results indicate that the system is able to monitor daily variations in current and voltage with good accuracy and stable data transmission. The measured output power of the solar panel ranges from 1 to 1.4 W, or approximately 2–3% of the nominal capacity, which is influenced by solar radiation intensity, panel temperature, and system losses. The proposed IoT-based monitoring system has proven effective in recording the actual performance of the solar panel and providing real-time information that is useful for performance evaluation and optimization of small-scale solar energy utilization.
Pelatihan Masyarakat Desa Lopana Satu Kecamatan Amurang Timur dalam Evaluasi Kualitas Air Sumur di Wilayah Pesisir Melalui Analisis Geokimia Ferdy, Ferdy; Siahaan, Berton M; Pandara, Dolfie; Pasau, Guntur; Bobanto, Maria; Mambu, Brian
The Studies of Social Sciences Vol. 8 No. 1 (2026): The Studies of Social Sciences
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35801/tsss.v8i1.66271

Abstract

Wilayah pesisir Desa Lopana Satu, Kecamatan Amurang Timur, memiliki ketergantungan tinggi terhadap air sumur dangkal sebagai sumber utama air bersih, namun kondisi tersebut rentan terhadap pencemaran dan intrusi air laut. Permasalahan yang dihadapi masyarakat adalah keterbatasan pengetahuan dan keterampilan dalam memantau kualitas air sumur secara mandiri. Kegiatan Program Kemitraan Masyarakat ini bertujuan meningkatkan pemahaman dan kemampuan masyarakat dalam pengukuran serta interpretasi kualitas air sumur berbasis parameter geokimia menggunakan alat ukur portabel. Metode pelaksanaan meliputi sosialisasi, pelatihan, pendampingan teknis, dan evaluasi, dengan pengukuran parameter TDS, EC, pH, dan salinitas pada sepuluh sumur sebagai sampel. Hasil kegiatan menunjukkan bahwa nilai TDS air sumur berada pada rentang 210–274 ppm, EC 424–546 µS/cm, dan salinitas sebesar 0,2‰ yang mengindikasikan kondisi air masih tergolong air tawar dan belum terpengaruh intrusi air laut, meskipun beberapa sampel memiliki nilai pH di bawah baku mutu. Evaluasi kegiatan menunjukkan adanya peningkatan pemahaman dan keterampilan masyarakat dalam melakukan pemantauan kualitas air secara mandiri. Kegiatan ini memberikan kontribusi awal berupa data kualitas air sumur dan meningkatkan kesadaran masyarakat terhadap pentingnya pengelolaan sumber daya air pesisir secara berkelanjutan.
Modified household pressure cookers as Hydrothermal Reactor for Production of Carbon Dots from Fish Scale Waste Dolfie Paulus Pandara; Stepanus Tangdan; Guntur Pasau; Ferdy Ferdy; Maria Daurina Bobanto; Gerald Hendrik Tamuntuan; Ping Astony Angmalisang; Kawengian Warouw Alex Masengi; Maureen Kumaunang
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 15, No 1 (2025): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v15i1.86405

Abstract

Recent advancements in the synthesis of carbon dots utilizing basic equipment are crucial for their large-scale production. This study explores the use of household pressure cookers to synthesize carbon dots from fish waste. A thermocouple and manometer are integrated into the cooker to regulate temperature and monitor pressure. Optimization of the equipment reveals that heating 2000 mL of distilled water to 100°C requires 20, 30, and 32 minutes with power inputs of 800 W, 700 W, and 600 W, respectively. The modified cooker achieves optimal pressure and temperature at 2.4 bars, 1.7 bars, and 1.5 bars, and 136°C, 123°C, and 122°C after 60 minutes of heating with the same power inputs. These results demonstrate that a household pressure cooker can effectively synthesize carbon dots. Experiments using dried Red Snapper fish spray powder, both unground and ground, at 800 W, 700 W, and 600 W, reach optimal pressure of 2.4 bar in 36, 49, and 58 minutes, and temperatures of 128°C, 131°C, and 136°C. Carbon dots are synthesized from fish scales as fine fibers with a 1:5 weight ratio of scales to distilled water, employing 600 W power, 2.4 bar pressure, 136°C temperature, 58 minutes of boiling, 5 minutes of centrifugation at 3500 rpm, and 45 minutes of ultrasound at 42 kHz. The formation of carbon dots is confirmed by an absorption peak at 405 nm in the UV-Vis spectrum, indicating high absorbance and bright blue fluorescence. Further investigation is required to optimize equipment using various fish scales and purification processes
Co-Authors A. Saefuloh Abidjulu, Gilbert Adey Tanauma Alatif, Yahya Halim Aldi Cahya Muhammad Angmalisang, Ping Astony Ango, Christian Imanuel Arip Nurahman Asnawi Asnawi As’ari Bakti, Andi Ikthiar Belekubun, Arwildo Fianli Bobanto, Maria Bobanto, Maria D Bobanto, Maria D. Budiman Nasution D.D Tampemawas Dini Lestari Febriani Toba Ferdy Ferdy . Ferdy Ferdy Ferdy Ferdy Ferdy Ferdy Gerald H Tamuntuan Gerald Hendrik Tamuntuan Gerald Tamuntuan Gerald Tamuntuan Gloria R Kaindeh Guntur Pasau Guntur Pasau Guntur Pasau Handy I. R. Mosey Handy Indra Regain Mosey Hanny F. Sangian Herling D. Tangkuman Hesky S Kolibu, Hesky S Hesky S. Kolibu Hesky Stevy Kolibu Hesky Stevy Kolibu Johnly A. Rorong Kaindeh, Gloria R Kasim, Mohd Shahir Kawengian Warouw Alex Masengi Korengkeng, Fioren Laoh, Marco Lulut Alfaris Maguna, Reynold Alexander Mambu, Brian Manginsabara, Ivone S Mans Mananohas Mans Mananohas, Mans Maria D. Bobanto Maria D. Bobanto Maria Daurina Bobanto Maureen Kumaunang Maureen Kumaunang Mosey, Handy I R Nyuswantoro, Ukta Indra Ping Astony Angmalisang Ponumbol, Yuki Ponumbol, Yuki Paischa Puterama, Mareyo R Telleng Ruben Cornelius Siagian Saefuloh, A. Sagai, Fingken Stevanus Sahroni, Taufik Roni Seni H Tongkukut Seni H. Tongkukut Seni H.J. Tongkukut, Seni H.J. Seni Herlina Juwita Tongkukut Siagian, Ruben Cornelius Siahaan, Berton M Sinaga, Mardame Pangihutan Stepanus Tangdan Tampemawas, D.D Telleng, R Tirza Wungkana Tongkukut, Seni H Tongkukut, Seni Herlina Juita Tumbelaka, Agry Yoel Unso, Kristina Verna A. Suoth Vistarani Arini Tiwow Wardana, Febriansyah Wibowo, Arnowo Hari Winsyahputra Ritonga _, Ferdy