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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) The Studies of Social Sciences Vivabio : Jurnal Pengabdian Multidisiplin Jurnal Ilmiah Sains
Pandara, Dolfie Paulus
Universitas Sam Ratulangi
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education 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; Wungkana, Tirza; Pandara, Dolfie Paulus; Bobanto, Maria D.; Sangian, Hanny F.; Tanauma, Adey; Tongkukut, Seni H.; Kolibu, Hesky S.
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.  
Characterization of Seawater Intrusion into Groundwater Aquifers Using the Electrical Resistivity Method in the Coastal Area of Tateli, North Sulawesi Ferdy, Ferdy; Pandara, Dolfie Paulus; Bobanto, Maria Daurina; Mambu, Brian Benyamin
Jurnal Penelitian Pendidikan IPA Vol 11 No 10 (2025): October
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i10.12303

Abstract

This study aims to characterize the potential seawater intrusion in the aquifers of the coastal area of Tateli Beach, Manado. A geoelectrical resistivity survey was conducted using a dipole–dipole configuration with 48 potential electrodes spaced 10 m apart. The data were processed using RES2DINV software to generate two-dimensional resistivity sections. The resistivity values were correlated with groundwater quality data from nearby wells, particularly salinity and electrical conductivity. The modeling results revealed a low-resistivity zone (≤10 ohm·m), interpreted as a water-saturated aquifer down to a depth of approximately 20 m, overlain by a high-resistivity layer (≥5,000 ohm·m) acting as an aquifuge. Groundwater samples indicated salinity values of 0.01–0.02% and electrical conductivity ranging from 208 to 483 µS/cm, which are still classified as freshwater. In addition, a deeper aquifer was identified at around 50 m depth. These findings suggest that no significant seawater intrusion is currently present. The integration of resistivity imaging and groundwater quality analysis supports the conclusion that the aquifers remain preserved, although continuous monitoring is required to detect potential changes due to human activities and climate impacts.
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 D Bobanto, Maria D. Budiman Nasution D.D Tampemawas Dini Lestari Febriani Toba Ferdy Ferdy . Ferdy Ferdy Ferdy Ferdy Gerald H Tamuntuan Gerald Tamuntuan Gerald Tamuntuan Gloria R Kaindeh 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 Korengkeng, Fioren Laoh, Marco Lulut Alfaris Maguna, Reynold Alexander Mambu, Brian Benyamin Manginsabara, Ivone S Mans Mananohas Mans Mananohas, Mans Maria D. Bobanto Maureen Kumaunang Mosey, Handy I R Nyuswantoro, Ukta Indra 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.J. Tongkukut, Seni H.J. Seni Herlina Juwita Tongkukut Siagian, Ruben Cornelius Sinaga, Mardame Pangihutan Tampemawas, D.D Telleng, R Tongkukut, Seni H 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 Wungkana, Tirza _, Ferdy