Page 2 (data 31 to 60 of 239) | Displayed ini 30 data/page
<< PREV 1 2 3 4 5 6 7 8 NEXT >>

31	Earth Physics and Space Science	ABS-124
Diurnal Rainfall Characteristics over Western Sumatra Revealed by C-Band Weather Radar Observations during 2022-2024 Yudha Nugraha1, Marzuki Marzuki1* 1Department of Physics, Faculty of Mathematical and Natural Sciences, Universitas Andalas *Email: marzuki[at]sci.unand.ac.id Abstract In recent years, identification of diurnal rainfall over Sumatra is generally using data from rain gauge, satellite observation, and reanalysis. This study aims to understand the diurnal rainfall characteristics from different perspective by using C-band ground radar observation, which is located in Padang, on the coast of West Sumatra. Radar reflectivity factor (Z) is used to obtain rainfall estimates (R) based on the Marshall-Palmer Z-R relationship (Z = 200R1,6). The diurnal characteristics for each topographic variation in the western part of Bukit Barisan, Sumatra were analyzed from accumulation, intensity, and occurrence of frequency during the period 2022-2024, both spatially and temporally. The results shows that mountainous region have the highest mean rainfall accumulation and occurrence frequency compared to others area with its diurnal peak time occurring in the afternoon (1400-1500LT). Meanwhile, in offshore region, accumulation and frequency of rainfall occur more often in the early morning (0300-0600LT). Another importance notes are rainfall diurnal on the western side of the Sumatra is more influenced by MJO phases rather than seasonal conditions. Whereas active MJO at phase 2-4 play a role in modulating amplitude and increasing mean rainfall accumulation and frequency, as well as accelerating the peak propagation time away from mountains. Keywords: diurnal, rainfall, C-band radar, west Sumatra, Madden-Julian Oscillation Share Link | Plain Format | Corresponding Author (Yudha Nugraha)

32	Earth Physics and Space Science	ABS-151
THE EFFECT OF SEISMIC STATION CONFIGURATION ON THE ESTIMATION OF EARTHQUAKE SOURCE PARAMETERS USING THE THREE-COMPONENT WAVEFORM INVERSION METHOD Muhlis 1, Sukir Maryanto 2, Didik R Santosa 2, Adi Susilo 2, Rais Akbar Alim 3 1. Physics, Faculty Sains, Technology and Matematic, Brawijaya University of Malang, MAN Panggul 2. Physics, Faculty Sains, Technology and Matematic, Brawijaya Unirvesity of Malang 3. Physics, Mathematics and Natural Sciences, Institut Technology of Bandung Abstract This study aims to analyze the effect of station configuration on the results of earthquake source parameter estimates. The data used consists of three-component local waveforms recorded by three IRIS broadband stations belonging to WebDC 3 (SBM, KSM, and KNRA) from 2009 to 2025, specifically for earthquakes that occurred in Sumbawa, West Nusa Tenggara on November 8, 2009, at 09:41:44.8 GMT, with a magnitude of 6.7 at latitude -8.32 and longitude 118.7, at a depth of 18.3 km. Earthquake source parameters were determined using the discrete wave number method to calculate the Greens function and the deconvolution iteration method to invert the moment tensor using local three-component waveforms. This method was implemented in the ISOLA software package. The data were inverted from 0.03 Hz to 0.07 Hz to obtain the earthquake source parameters for the event in that region. The results of the discussion indicate that the configuration of the stations used in the study influences the estimated earthquake source parameters. As the distribution of the seismic stations used approaches an azimuth of 180, the estimated earthquake source parameters become more accurate and align more closely with the Global CMT. It was also found that this study identified the primary causes of the earthquakes as normal and strike-slip faults. Keywords: seismic station configurations, earthquake source parameters, three component local waveforms. Share Link | Plain Format | Corresponding Author (Muhlis A)

33	Earth Physics and Space Science	ABS-155
MAGNITUDE TRANSFORMATION FROM RGB BAYER FILTER TO THE JOHNSON-COUSINS BVR FILTER BASED ON CAT-ITB TELESCOPE PHOTOMETRIC OBSERVATIONS OF M67, M11, IC 4665, AND RU 135 Raihan Amirul Husana (a*), Mahasena Putra (b), Anton Timur Jaelani (b), Chatief Kunjaya (b), Aliyya Nur Rahma (c), Firdaus Orvin Dwifauja Manalu (a) a) Astronomy Study Program, FMIPA, Institut Teknologi Bandung, Jl. Ganesa 10, Bandung 40132, Indonesia *hansamirul[at]gmail.com b) Astronomy Research Group, FMIPA, Institut Teknologi Bandung, Jl. Ganesa 10, Bandung 40132, Indonesia c) Astronomy Doctoral Program, FMIPA, Institut Teknologi Bandung, Jl. Ganesa 10, Bandung 40132, Indonesia Abstract Photometry is one of the astronomical measurement methods that provides astronomers with information about the brightness of astronomical objects at various wavelengths. Over time, various photometric systems have been developed. Therefore, transformations are necessary to convert results from one photometric system to another, with the aim of facilitating scientific communication among researchers working with various photometric systems. The CAT-ITB, or City Astronomical Telescope ITB, is an 11-inch optical telescope located at CAS ITB, equipped with detectors, one of which is the ZWO ASI 183MC that uses the RGB Bayer filter. Hence, transformation equations from the RGB Bayer filter system to the Johnson-Cousins BVR filter system must be established. By utilizing transformation equations that have historically been widely used by previous researchers, this study focuses on deriving the coefficients needed to solve those equations. Observational data of open clusters M67, RU 135, IC 4665, and M11 were obtained using CAT-ITB, which were used to optimize the transformation equations. The coefficients derived from M67 photometric data yielded the best results, with total RMS values for the magnitude transformations of clusters M67, RU 135, IC 4665, and M11 in each of the B_{Johnson}, V_{Johnson}, and R_{Cousins} conversions are 0.296, 0.152, and 0.161 respectively. All transformations produced small residuals and colour-magnitude diagrams that closely resemble those from catalog data. Keywords: Photometry- Transformation- RGB Bayer Filter- Johnson-Cousins BVR Filter- Open Cluster Share Link | Plain Format | Corresponding Author (Raihan Amirul Husana)

34	Earth Physics and Space Science	ABS-157
ANALYSIS OF THREE-COMPONENT WAVEFORM INVERSION TO DETERMINE THE FAULT PLANE PATTERNS OF EARTHQUAKES IN THE WEST NUSA TENGGARA REGIONANALYSIS OF THREE-COMPONENT WAVEFORM INVERSION TO DETERMINE THE FAULT PLANE PATTERNS OF EARTHQUAKES IN THE WEST NUSA TENGGARA REGION Muhlis 1, Sukir Maryanto 2, Adi Susilo 2, Didik R Santosa 2, Rais Akbar Alim 3 1. Physics, Faculty Sains, Technology and Matematic, Brawijaya University of Malang, MAN Panggul 2. Physics, Faculty Sains, Technology and Matematic, Brawijaya University of Malang 3. Physics, Faculty Matematics and Natural Sains, Institut Technology of Bandung Abstract Sumbawa Island is an earthquake-prone area. Over the past seventeen years, from 2009 to 2025, IRIS has recorded around 350 major earthquakes in Indonesia, 35 of which occurred on the island of Java. For example, on 8 November 2029, at 22:41:05 WIB, an earthquake with a magnitude of Mw = 5.9 occurred. This is because Sumbawa Island is situated between three subduction zones that can trigger earthquakes in Indonesia. Seismogram analysis using three-component waveforms was conducted to obtain the moment tensor and determine the pattern of subduction fault planes on the island of Java. This research began with a request for several earthquake events from IRIS. Subsequently, using the ISOLA software, data conversion and pre-processing were carried out- the data input included: a crustal model, event information, station selection, raw data preparation, and the definition of the seismic source, calculation of the Green^s function, inversion, and plotting of the inversion results. Subsequently, the fault planes responsible for the earthquakes were depicted using hcplot software. The results of this seismogram analysis revealed that the fault plane patterns developing on the island of Sumbawa consist of normal faults and reverse faults parallel to the islands arc. Keywords: Three-component waveform inversion, moment tensor, earthquakes Share Link | Plain Format | Corresponding Author (Rais Akbar Alim)

35	Earth Physics and Space Science	ABS-169
Radio Kinematics and Compound Acceleration of Solar Proton Event in 14 November 2025 Farahhati Mumtahana (a), Nanang Widodo (a), Johan Muhamad (a), Tiar Dani (a)(b), Gerhana Puannandra Putri (a), Rasdewita Kesumaningrum (a)(c), Santi Sulistiani(a), Mulya Diana Murti(a), Mario Batubara(a) a) Research Center for Space, National Research and Innovation Agency Jalan Sangkuriang, Dago, Kecamatan Coblong, Kota Bandung, Jawa Barat 40135, Indonesia *fara006[at]brin.go.id b)Department of Computer Science and Electronics, Universitas Gadjah Mada Sekip Utara Bulaksumur, Yogyakarta 55281, Indonesia c)Astronomy Study Program, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung Jalan Ganesha 10, Bandung 40132, Indonesia Abstract Keywords: SEP, solar radio burst, Callisto, VDA Share Link | Plain Format | Corresponding Author (Farahhati Mumtahana)

36	Earth Physics and Space Science	ABS-174
Analysis of Landslide Slip Surfaces Using Geoelectrical Methods : A Case Study in Cianjur, West Java, Indonesia Rizky Kurniawati (a), Arif Laksana (a), Masrinaldo (a), Wahyu Srigutomo (a), Nurhasan (a), Enjang Jaenal Mustopa (a*) Earth Physics and Complex Systems Reseacrh Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia Abstract Cianjur is located in a high earthquake hazard zone. Earthquakes can trigger secondary disasters, one of which is landslides. One of the most influential factors causing landslides is the slip surface. One method that can be used to investigate the slip surface is the geoelectrical method. The slip surface is generally located between zones with low and high resistivity values. Therefore, this study aims to analyze the slip surface associated with landslides that occurred in Cianjur using the geoelectrical method. Data acquisition was carried out using the Wenner-Schlumberger configuration with a survey line length of 80 m and an electrode spacing of 5 m at two different locations in Cianjur Regency. At Location 1, two survey lines were measured, while at Location 2, four survey lines were conducted. The results show that at Location 1, the subsurface resistivity ranges from 6 Ohm-m to 611 Ohm-m. The depth of the slip surface at Location 1 ranges from 3.75 to 12.6 m. At Location 2, the subsurface resistivity ranges from 1 Ohm-m to 3205 Ohm-m. The depth of the slip surface at Location 2 ranges from 6.38 to 9.25 m. This layer is interpreted as clayey sand or more compact silt, which acts as a boundary between compact sandstone with high resistivity and water-saturated clay with low resistivity. Keywords: Slip Surface, Geoelectrical, Electrical Resistivity Tomography Share Link | Plain Format | Corresponding Author (Rizky Kurniawati)

37	Earth Physics and Space Science	ABS-185
Three-Dimensional Analysis of a Polar Crown Filament Eruption Driven by Magnetic Breakout on 20 April 2023 Rasdewita Kesumaningrum(1,2), Johan Muhamad(2), Tiar Dani(2,3), Muhamad Zamzam Nurzaman(2,4), Santi Sulistiani(2), Nanang Widodo(2), Farahhati Mumtahana(2), Dhani Herdiwijaya(1,5) (1)Astronomy Study Program, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung Indonesia. (2)Research Center for Space, National Research and Innovation Agency (BRIN), Bandung, Indonesia. (3)Department of Computer Science and Electronics, Universitas Gadjah Mada (UGM), Sleman, Indonesia. (4) Department of Astronomy, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku,Kyoto, Japan. (5)Center for Space Science, Technology, and Innovation, Bandung Institute of Technology, Bandung, Indonesia. Abstract On 20 April 2023, a prominence eruption occurred near the Sun^s northern polar region. Prior to the eruption, the structure appeared as a Polar Crown Filament (PCF) that remained visible for several days. The event was simultaneously observed from different viewing angles by Solar Orbiter and Solar Dynamics Observatory (SDO), enabling a stereoscopic investigation of the filament. Using these multi-viewpoint observations, we reconstructed the three-dimensional morphology of the PCF and examined the evolution of the eruption. The results suggest that a sequence of magnetic reconnection events facilitated the eruption and subsequent escape of the magnetic flux rope (MFR) into interplanetary space. The footpoint locations associated with the reconnecting field lines and the MFR were estimated through a triangulation technique based on localized brightenings observed during the eruption. Furthermore, analysis of the three-dimensional geometric evolution of the PCF indicates that the eruption was driven by a magnetic breakout process. Keywords: polar crown filament, prominence, solar eruption, magnetic break out Share Link | Plain Format | Corresponding Author (Rasdewita Kesumaningrum)

38	Earth Physics and Space Science	ABS-197
Advancing Regional Landslide Hazard Mapping from Heuristic Indexing to Intelligent Ensembles in Langkat Regency, Indonesia Togi Tampubolon (a*), Juniar Hutahean (a), Muhammad Fazar Zuhri (a), Jeddah Yanti (b)(c) (a) Department of Physics, Faculty of Mathematics and Natural Science, State University of Medan, Jl. Willem Iskandar, Indonesia *togitampubolon[at]unimed.ac.id (b) Doctoral Program in Environmental Science, Gadjah Mada University, Jl. Teknika Utara, Indonesia (c) Department of Geography, Faculty of Mathematics and Natural Science, State University of Makassar, Jl. Daeng Tata, Indonesia Abstract Landslide hazard in Langkat Regency is traditionally assessed using a GIS-based heuristic assessment system in accordance with BNPB guidelines. However, these methods rely on subjective expert weights and assume nearly linear relationships among conditioning factors, which makes them inappropriate for the region^s complex terrain. This study addresses that limitation by developing an intelligent ensemble framework integrating Analytical Hierarchy Process-GIS (AHP-GIS) with a hybrid deep learning architecture, a Convolutional Neural Network (CNN) combined with a Random Forest (RF) classifier. Hazard maps were produced at high resolution using a verified landslide inventory (2020-2025) and 11 geo-environmental conditioning factors, including elevation, slope, aspect, plan and profile curvature, NDVI, rainfall, lithology, distance to fault, land use, and TWI, processed in GEE and Google Colab. The CNN+RF ensemble model outperformed individual models (Accuracy: 97.8%, AUC-ROC: 0.657, and F1: 0.0006). Based on the SHAP analysis, slope (0.0685), lithology (0.0542), and plan curvature (0.0483) were significant hazard predictors. The Pearson correlation analysis showed a strong negative correlation (r = &#8722-0.83) between rainfall and distance to fault, suggesting that high-rainfall areas spatially coincide with fault-proximate areas. The ensemble hazard mapping showed that the Moderate-to-High danger zones covered an area of approximately 12.52 km2, mostly in steep and fault-proximate terrains. The sub-districts of Sei Bingai, Bahorok, and Besitang were consistently identified as high-risk areas. This framework provides an accurate and interpretable decision-support tool that can be validated in other landslide-prone locations in Indonesia. Keywords: Landslide Susceptibility, Hazard Mapping and Explainability, AHP-GIS, Deep Learning, Langkat Share Link | Plain Format | Corresponding Author (Togi Tampubolon)

39	Earth Physics and Space Science	ABS-221
Extreme Rainfall and Hydrometeorological Impacts of Tropical Cyclone Senyar in Aceh, Indonesia: A Regional Spatial Synthesis Ahmad Farhan1*, Muhammad Syukri1, Susanna1, Teuku Muhammad Hary Ramadhan1, Muhammad Syukri2, Saumi Syahreza2, Taufan Hidayat3, Muhammad Okta Ridha Maulidian4, Muhajir5, and Muhammad Rizal5 1 Department of Physics Education, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia 2 Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia 3 Department of Agrotechnology, Faculty of Agriculture, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia 4 Department of Geography Education, Universitas Syiah Kuala, Banda Aceh 23111, Indonesia 5 Aceh Climatology Station, Indonesian Meteorological, Climatological and Geophysical Agency (BMKG), Aceh Besar, Indonesia Corresponding author: farhan[at]usk.ac.id Abstract Tropical Cyclone Senyar, which developed in the low latitude region of the Malacca Strait on November 26-27, 2025, triggered a rare and high impact extreme precipitation event in Aceh Province. Daily rainfall values severely exceeded the BMKG extreme threshold of more than 150 mm per day. This low latitude phenomenon was driven by multi scale atmospheric disturbances, including the intensification of the Asian Monsoon, a weak La Nina anomaly, and equatorial waves that enhanced tropical depression 95B into Cyclone Senyar. This study assesses the resulting widespread flooding, landslides, and vital infrastructure damage using an integrated spatial synthesis approach. Observational data indicate a heterogeneous distribution of extreme rainfall, with the ARG Meureudu and Kuala stations recording the highest daily accumulations at 376.6 mm and 411 mm, respectively. The intense rainfall triggered severe fluvial flooding across downstream alluvial plains and widespread slope failures in the upstream Bukit Barisan zone due to a sharp reduction in residual soil shear strength. Significant structural damage was documented on downstream transportation infrastructure due to lateral erosion and impacts from massive driftwood. Furthermore, severe scouring caused the collapse of regional power transmission towers, resulting in prolonged regional blackouts. This study emphasizes the urgency of strengthening structural mitigation frameworks and multi risk early warning systems in equatorial regions to address the increasing trend of low latitude tropical cyclones driven by global climate change. Keywords: Tropical Cyclone Senyar, Extreme Rainfall, Landslide, Fluvial Flood, Compound Hazards Share Link | Plain Format | Corresponding Author (Ahmad Farhan)

40	Earth Physics and Space Science	ABS-235
Investigating the Behavior and Correlation Between Apparent, Total Corrected Sunspot Areas Parameters and the Total Sunspot Brightness Index Aqeel Z. Azeez & Khalid A. Hadi Department of Astronomy and Space, College of Science, University of Baghdad, Baghdad, Iraq Abstract Sunspot characteristics (Total Apparent Sunspot Area (TASA), Total Corrected Sunspot Area (TCSA), and Total Sunspot Brightness (TSB)) are important indicators of solar activity. In this work, an analytical investigation was conducted of the TASA, TCSA, and TSB datasets observed using the solar science observatory above the Mitaka campus for the years of solar cycle 24 and the ascending phase of solar cycle 25. The study findings showed that the TCSA parameter values were more accurate compared to the TASA parameter data for all months of the years 2009-2024. It also showed that the behavior of the TCSA and TSB parameters exhibited significant fluctuations during the peak of solar cycles 24 and 25 and less variation during the minimum years (2009, 2019). The mathematical correlation tests between the TSB and TCSA parameters, performed for all days/months of the adopted solar cycle years, showed that the exponential regression method yielded better correlation results than other methods. The predicted TCSA parameter results, calculated using the proposed mathematical equation, showed values closer to the observed values obtained from the white light telescope of the solar science observatory. Statistical calculation results of the standard error showed high accuracy in predicting TCSA values during the minimum years and a slight increase (variation) during the maximum years of the studied solar cycles. The statistical calculations of SSreg, SSres, and SSTotal, also showed a clear convergence between the observed and predicted values of the TCSA parameter, while the results of MSreg, MSres, MSTotal, and F-statistics, indicated the reliability of predicting the values of the TCSA parameter compared with the observed data for all the studied years. Keywords: Sunspots, Corrected Sunspot Area, Sunspot Brightness, Apparent Sunspot Area. Share Link | Plain Format | Corresponding Author (Aqeel Zuhair Azeez)

41	Earth Physics and Space Science	ABS-239
A Comprehensive Classification of Geomagnetic storms Asma^a A. Hamied and Khalid A. Hadi Department of Astronomy and Space, College of Science, University of Baghdad, Baghdad, Iraq. Abstract Geomagnetic storms are considered a global disturbance in Earth^s magnetosphere resulting from many interactions with solar plasma. Despite the significance of this topic, previous studies have remained limited to analyzing individual indices or specific types of storms. This study addresses a fundamental knowledge gap by presenting a comprehensive statistical analysis and classification of geomagnetic storms during Solar Cycle 24, based on three key indices (Dst, ap, and AP). The scientific significance of this work resides in the presenting of a ^unified classification table,^ a novel framework that consolidates and harmonizes the diverse classification criteria of the three examined indices into a singular standard, thus providing a unified comprehensive classification and analysis of geomagnetic storms. The classification results derived from the proposed criteria (table) revealed that the total number of geomagnetic storms according to the Dst index was 859: 577 were weak, 247 were moderate, 34 were strong, 1 was severe, and no great storms were recorded. Furthermore, the outcomes revealed that the strongest storm occurred on 17 March 2015, with a Dst value of -234 nT, which was classified as a severe storm. While the findings showed that relying on the ap-index, 4017 storms were recorded: 826 were very quiet, 1169 were quiet, 1045 were unsettled, 595 were active with G0, 258 were minors with G1, 97 were moderate with G2, 18 were major with G3, and 9 were severe with G4, with the strongest storm being recorded on 22 Jun 2015 with an ap-value of 236 nT, which was classified as a severe storm with G4. Whereas the classification outcomes for the Ap-index recorded 4017 storms: 2032 were very quiet, 958 were quiet, 729 were unsettled, 218 were active (G0), 69 were minor (G1), 9 were moderate (G2), and 2 were strong (G3), and there were no severe or extreme storms (G4 and G5). Meanwhile, on 17 March 2015, a strong storm with a G3 class was recorded with an Ap-value of 108 nT. The study demonstrates the effectiveness of the proposed unified criterion in capturing all relevant physical variations of the selected indices. The classification results indicated that the studied results exhibited a significant increase in counts of GMSs during periods of solar maximum and, on the other hand, a decrease in the amounts of geomagnetic storms, which is consistent with the approach of the solar cycle toward the minimum phase of solar activity. Keywords: : Geomagnetic storm, Geomagnetic indices, Dst-index, ap-index, Ap-index Share Link | Plain Format | Corresponding Author (Asmaa A. Hamied)

42	Earth Physics and Space Science	ABS-246
Spatiotemporal Assessment of Wetland environmental Quality in Hulu Sungai Utara Regency Based on the Remote Sensing Ecological Index Abraham Prakoso, Nurlina, Ichsan Ridwan, Mufidah Universitas Lambung Mangkurat Abstract This study assesses the spatiotemporal dynamics of wetland environmental quality in Hulu Sungai Utara Regency using the Remote Sensing Ecological Index (RSEI) derived from Landsat 5 and 8 imagery. The RSEI integrates three key parameters-Normalized Difference Vegetation Index (NDVI), Normalized Difference Moisture Index (NDMI), and Normalized Difference Built-up and Soil Index (NDBSI)-through Principal Component Analysis (PCA). Results indicate that the first principal component (PC1) effectively represents regional ecological conditions, explaining 94.15% of the variance in 2019 and 92.66% in 2023. Ecologically, the region maintained predominantly good to excellent conditions, with these top classes increasing in coverage from 76.13% in 2019 to 81.09% in 2023. While natural factors like vegetation and moisture primarily drove ecological variations initially, the influence of built-up and dry surfaces (NDBSI) became increasingly prominent by 2023 due to anthropogenic pressures. Overall, the environmental quality was highly stable (64.26%) with notable improvements (28.78%), although localized degradation (6.96%) was observed in areas facing intensive land use and development. Keywords: Remote Sensing Ecological Index (RSEI), Spatiotemporal, Environmental Quality, Wetland, SDGs Share Link | Plain Format | Corresponding Author (Nurlina Abdullah)

43	Energy and Environmental Physics	ABS-28
Designing for Sustainable Impact: A Community-Engaged STREAM Model for Membrane-Based Circular Ablution Water Management in a Coastal Island School Mushlihin (a*)- Aji Sofanudin (b) Sari Narulita (c) Rihlah Nur Aulia (d) 1. Department of Islamic Religious Education, State University of Jakarta, *mushlihin[at]unj.ac.id 2. Bandan Riset dan Inovasi Nasional 3. Department of Islamic Religious Education, State University of Jakarta 4. Department of Islamic Religious Education, State University of Jakarta Abstract This study develops a community-engaged STREAM design model for membrane-based circular ablution water management in a coastal school, SMP Satu Atap 01 Pari Island, that faces recurring water scarcity and sustainability challenges. Using a design-oriented research approach, the study integrates science, technology, engineering, religion, arts, and mathematics to transform ablution wastewater from a disposal problem into a pedagogical and environmental resource. The model was constructed through contextual needs analysis, interdisciplinary lesson design, technical adaptation of membrane filtration principles, and collaboration with school and community stakeholders. Findings indicate that the proposed model offers a practical pathway for aligning sustainability education with local environmental problem-solving, while also strengthening teacher collaboration, student inquiry, and community ownership. The STREAM framework supported the translation of a technical water-reuse system into meaningful classroom learning, enabling students to connect scientific concepts, ethical stewardship, and civic responsibility. The study contributes a replicable design for coastal and island schools seeking to improve water resilience through education-driven innovation. It also demonstrates that sustainable impact in school settings is enhanced when technological solutions are embedded within participatory pedagogy and community engagement. Keywords: STREAM pedagogy, community engagement, circular water management, membrane filtration, sustainable island school Share Link | Plain Format | Corresponding Author (Mushlihin Mushlihin)

44	Energy and Environmental Physics	ABS-30
Designing an IoT-Supported Tsunami Preparedness Model Using Sensor Data, Local Wisdom, and Community Communication Channels Muhammad Fikri Akbar, Sandy Allifiansyah, Nada Arina Romli, Eko Aziz Apriadi, E. Nugrahaeni P., Mega Ayu Permatasari, Abdul Razaque Chhachhar Universitas Negeri Jakarta, Indonesia Universitas Indonesia Mandiri, Indonesia University of Sindh, Pakistan Abstract Coastal areas in Indonesia remain highly vulnerable to tsunami risks, particularly in regions where technical early-warning systems are not yet fully connected to community-level understanding and response. This study proposes an IoT-supported tsunami preparedness model that integrates sensor data, local wisdom, and community communication channels to strengthen last-mile disaster communication in Bandar Lampung. The study is grounded in the argument that disaster preparedness cannot rely solely on technological detection systems, but requires the translation of technical signals into clear, trusted, culturally relevant, and actionable public messages. Using a qualitative exploratory case study approach, this research draws on expert-based focus group discussion data and a structured readiness assessment involving key stakeholders in disaster management, community leadership, social inclusion, risk communication, local governance, and IoT engineering. The assessment examines four domains: development communication strategies, IoT utilization, community and institutional preparedness, and integration between communication and technology. The findings indicate that Bandar Lampung^s tsunami preparedness system is moderately ready. Existing strengths include recognizable communication pathways through local government, RT/RW networks, mosque loudspeakers, community leaders, and emerging use of IoT-based environmental monitoring. However, gaps remain in sensor reliability, routine maintenance, public understanding of IoT signals, two-way feedback mechanisms, inclusion of vulnerable groups, evacuation drills, and standardized message translation. The proposed model adopts a hub-and-spoke workflow in which IoT sensors transmit environmental data to a local decision-support hub. The data are then converted into standardized warning messages and disseminated through multiple trusted channels, including official media, mosque public-address systems, neighborhood coordinators, traditional leaders, and locally recognized warning practices such as kentongan. This model positions local wisdom not as a symbolic cultural element, but as a functional component of early warning communication. The study contributes to disaster preparedness research by offering a people-centered IoT communication model for sustainable coastal resilience and supporting SDG 11 and SDG 13. Keywords: IoT, tsunami preparedness, sensor data, local wisdom, disaster communication, coastal resilience Share Link | Plain Format | Corresponding Author (Muhammad Fikri Akbar)

45	Energy and Environmental Physics	ABS-45
PID-Controlled IoT-Based Pyrolysis System for Palm Oil Biomass Waste Conversion and Real-Time Monitoring Kathryn Deandrea (a), Muhammad Daffa Dzaky Hilmy (a), Muhammad Ismail Ghozali (a), Dandy Cahyo Purnomo (a), Eka Budiarto (b), Yunita Umniyati (c*), Sri Wahyuni (d) (a) Mechatronics Engineering, Swiss German University Jalur Sutera Barat No. 15, Alam Sutera, Tangerang 15134, Indonesia (b) Master of Information Technology, Swiss German University Jalur Sutera Barat No. 15, Alam Sutera, Tangerang 15134, Indonesia (c) Master of Mechanical Engineering, Swiss German University Jalur Sutera Barat No. 15, Alam Sutera, Tangerang 15134, Indonesia *yunita.umniyati[at]sgu.ac.id (d) Electrical Engineering, Trunojoyo University Jalan Raya Telang PO. Box 2 Kamal, Bangkalan 69162, Indonesia Abstract Indonesia is the world^s largest producer of palm oil, generating a significant amount of biomass waste that poses environmental challenges while also offering potential as a renewable energy source. Pyrolysis technology provides an effective method for converting palm oil biomass waste into valuable products such as bio-oil, syngas, and biochar- however, conventional pyrolysis systems commonly rely on manual supervision and simple on/off temperature control methods that are unable to properly handle thermal lag and complex combustion reactions, leading to temperature overshoot, unstable operating conditions, reduced bio-oil yield, and safety risks. This research aims to design and develop an automated control and Internet of Things (IoT)-based monitoring system for a palm oil waste pyrolysis reactor by integrating a proportional-integral-derivative (PID) controller for furnace and condenser temperature regulation with an ESP32-based IoT architecture for real-time remote monitoring. A simplified mathematical model and transfer function of the thermal system were developed to enable safer and more efficient PID parameter tuning using the root locus method prior to implementation on the physical reactor. The research methodology includes system modeling, controller design, embedded system integration, and experimental validation through automated pyrolysis testing, where process parameters such as temperature and pressure are continuously monitored and transmitted for real-time analysis. The developed system is expected to improve temperature stability, enhance operational safety, reduce manual intervention, and optimize the overall performance of sustainable biomass-to-energy conversion processes. Keywords: Pyrolysis, Palm Oil Biomass Waste, PID Control, IoT Monitoring, Renewable Energy, ESP32 Share Link | Plain Format | Corresponding Author (Yunita Umniyati)

46	Energy and Environmental Physics	ABS-47
Experimental Investigation of Shaft Mass Variation on the Performance of a Horizontal-Axis U-Type Savonius Wind Turbine under Low Wind Speed Conditions Hadi Nasbey, Riser Fahdiran, and Aulia Wulandari Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Jakarta, Jakarta, Indonesia Abstract Wind energy is one of the most promising renewable energy resources in Indonesia- however, its utilization remains limited due to relatively low average wind speeds, particularly in Java, which range from approximately 2.7 to 4.5 m/s. This study investigates the effect of shaft mass variation on the performance efficiency of a horizontal-axis U-type Savonius wind turbine designed for low wind speed applications. The research employed an experimental method by developing a prototype consisting of three U-shaped blades made of 0.3 mm clear polyvinyl chloride (PVC), with blade dimensions of 93 cm in length, 16 cm in diameter, and 8 cm in radius. To improve structural stability, each blade was equipped with four supporting ribs. Three different shaft materials with varying masses were tested: aluminum shaft (166 g), stainless steel shaft (453.5 g), and brass shaft (486 g). Experimental testing was conducted under laboratory-scale conditions using a blower and wind tunnel system with wind speed variations ranging from 1 to 10 m/s. The measured output parameters included shaft rotational speed, output voltage, and electric current generated by a DC generator. The experimental results revealed that the stainless-steel shaft (453.5 g) achieved the highest average efficiency of 2.41%, producing an average turbine power output of 2.37 mW at wind speeds between 2 and 6 m/s. The aluminum shaft generated an average efficiency of 1.42% with a power output of 2.37 mW, while the brass shaft produced an average efficiency of 1.96% with a power output of 2.59 mW. These findings indicate that shaft mass significantly affects rotational stability and energy conversion efficiency in low-speed wind turbine systems. This study highlights the potential of modified Savonius turbines for micro-scale renewable energy harvesting applications in low wind speed regions. Keywords: renewable energy- rotational inertia- Savonius turbine- wind energy conversion- low-speed wind- power efficiency Share Link | Plain Format | Corresponding Author (hadi nasbey)

47	Energy and Environmental Physics	ABS-65
Thermal Analysis of the Addition of MgCl2.6H2O to Eggshell Based Calcium Chloride Hexahydrate to Enhance the Properties of Phase Change Materials Vidya E. P. Hilda1, Hafidhoh Tasya1, Alawiyah1, Wardoyo1, P.N.A. Nugroho2 and D.A. Wulandari1,* 1 Department of Mechanical Engineering, Universitas Negeri Jakarta, Jakarta 13220, Indonesia 2 Shipbuilding Engineering Department, Politeknik Perkapalan Negeri Surabaya E-mail: dyaharum[at]unj.ac.id, priyambodo[at]ppns.ac.id Abstract Abstract. Increasing energy needs have driven the development of efficient Thermal Energy Storage using calcium chloride hexahydrate (CaCl2.6H2O) as a Phase Change Material. This material has good thermal energy storage capacity, although it faces challenges such as supercooling and phase separation. This study examines the synthesis and characteristics of CaCl2.6H2O from chicken eggshell waste using 5% HCl. Then, 20 wt% MgCl2.6H2O was mixed with the CaCl2.6H2O synthesis to obtain a eutectic mixture by adjusting the phase transition temperature. 1 wt% SrCl2.6H2O was added to suppress the supercooling phenomenon in the eutectic mixture. The combination with 0.5 wt% CMC was used to overcome phase separation. FTIR analysis confirmed the presence of carbonate chemical bond functional groups in the eggshell as well as crystalline water molecules in the synthesized hydrate system. XRD results showed that eggshell powder and CaCl2.6H2O had diffraction patterns with a degree of crystallinity. Based on DSC testing on CaCl2.6H2O - 20wt% MgCl2.6H2O - 1wt% SrCl2.6H2O - 0.5wt% CMC, an enthalpy value of 109.3 J/g was obtained with a melting onset temperature of 21.7 degrees celsius and a melting peak temperature of 26.3 degrees celsius and a melting end temperature of 27.9 degrees celsius was in accordance with human thermal comfort indoors. Keywords: CaCl2.6H2O, Eggshells, MgCl2.6H2O, Phase Change Material, Thermal Energy Storage Share Link | Plain Format | Corresponding Author (Vidya Eksa Putri Hilda)

48	Energy and Environmental Physics	ABS-79
Green Technology Innovation Model of Eco-Saintek Pesantren: Developing Waste Management and Climate Adaptation in Vulnerable Regions to Support the SDGs Rihlah Nur Aulia1*, Eliana Sari2 Faisal M. Jasin3 and Khalilah Zakariya4 1 IRE, Universitas Negeri Jakarta, Jakarta, Indonesia 2 Manajemen Lingkungan, Universitas Negeri Jakarta, Jakarta, Indonesia 3 Teknik Lingkungan, IKTJ PKP DKI Jakarta, Jakarta, Indonesia 4 Department of Landscape Architecture, International Islamic University Malaysia, Kuala Lumpur, Malaysia Abstract Climate-vulnerable regions in Indonesia face pressing challenges such as flooding, drought, environmental degradation. Pesantren, as community-based educational institutions, hold significant potential to serve as hubs for green technology innovation. The concept of Eco-Saintek Pesantren is introduced as an integrative model that combines religious values, scientific knowledge, and environmentally friendly technologies for waste management & climate change adaptation. Previous studies emphasize that ecopesantren can contribute to the achievement of the Sustainable Development Goals through environmental leadership, renewable energy adoption, cross-sector collaboration. This study aims to design a green technology innovation model for pesantren, grounded in energy & environmental physics. The focus includes organic & non-organic waste management, renewable energy utilization-such as biogas, solar panels, & micro-hydro from streams- & adaptation strategies in climate-vulnerable areas. The research contributes to scientific development by enriching literature on the integration of energy-environmental physics with community-based education. The theoretical framework employs Environmental Physics & Green Technology Innovation Theory, highlighting the relationship between energy-environmental systems & socio-religious values. A mixed-method approach with an exploratory-descriptive design was applied, involving observation, interviews, documentation, both quantitative & qualitative analyses. Findings reveal that organic waste management produces biogas with an energy potential of 12-15 kWh per day, covering about 35% of the pesantren^s kitchen energy demand. Non-organic waste recycling, eco-bricks reduce waste volume by 45% while generating economic value. Solar panels & micro-hydro increase energy independence by 25%, equivalent to a reduction of 1.2 tons of CO&#8322- emissions annually. These results confirm that the Eco-Saintek Pesantren model not only supports SDGs Keywords: Eco-Saintek Pesantren- Green Technology Innovation- Waste Management- Climate Change Adaptation- SDGs Share Link | Plain Format | Corresponding Author (Rihlah Nur Aulia)

49	Energy and Environmental Physics	ABS-83
Mangrove Health and Carbon Stock Assessment in Muara Gembong District, Bekasi Regency: Supporting Indonesia^s FOLU Net Sink 2030 within the Framework of Energy and Environmental Physics Faisal M. Jasin Teknik Lingkungan. Institut Kesehatan dan Teknologi PKP DKI Jakarta Abstract Mangrove ecosystems are recognized as one of the most efficient natural carbon sinks, playing a vital role in mitigating climate change and supporting global emission reduction targets. In Indonesia, the Forestry and Other Land Use (FOLU) Net Sink 2030 initiative emphasizes the importance of conserving and restoring mangroves as part of national climate strategies. This study aims to assess the health of mangroves in Muara Gembong District, Bekasi Regency, and to quantify their carbon stock potential in relation to energy and environmental physics perspectives. The research provides benefits by offering scientific evidence to strengthen policy implementation, guiding sustainable coastal management, and supporting Indonesia^s commitment to international climate agreements. The theoretical framework is grounded in ecological physics and carbon cycle dynamics, highlighting the interaction between energy flow, biomass accumulation, and greenhouse gas mitigation. Methodologically, the study employed field surveys to evaluate vegetation health, biomass sampling for above- and below-ground components, and carbon estimation using allometric equations combined with laboratory analysis. Results indicate that mangrove health in the study area ranges from moderate to good, with dominant species such as Avicennia marina and Rhizophora mucronata contributing significantly to carbon storage. The estimated carbon stock demonstrates substantial potential to offset regional emissions, reinforcing the role of mangroves as critical natural infrastructure for climate resilience. The scientific contribution of this research lies in integrating ecological assessment with energy and environmental physics, providing a quantitative basis for understanding carbon sequestration efficiency in mangrove ecosystems. This integrative approach not only supports Indonesia^s FOLU Net Sink 2030 target but also advances interdisciplinary knowledge on the nexus between ecosystem health, carbon dynamics, and sustainable energy transition Keywords: Mangrove health- Carbon stock assessment- FOLU Net Sink 2030- Energy and environmental physics- Carbon cycle dynamics Share Link | Plain Format | Corresponding Author (faisal m jasin)

50	Energy and Environmental Physics	ABS-120
Energy Efficiency Improvement in a Hybrid PV-TEG System with Finned Aluminum Heatsinks Syafrima Wahyu (1*), Nur Rahma Hidayanti (1), Puji Suharmanto (2), Temon Sujadi (3), and Ahmad Fitra Ritonga (4) 1) Department of Physics, Universitas Negeri Jakarta, Jl. Rawamangun Muka, Jakarta 13220, Indonesia *syafrimawahyu[at]unj.ac.id 2) Ph.D Management Business Graduate School, Universiti Tun Abdul Razak, Kuala Lumpur, Malaysia 3) PT Solar Energy Power, Jl. Prapanca 2, Perum Grand Residence City, Cijengkol, Setu Bekasi, 17320, Indonesia 4) Department of Physics Education, Universitas Sriwijaya, Jl. Raya Palembang-Prabumulih, Sumatera Selatan, 30862, Indonesia Abstract Hybrid photovoltaic-thermoelectric generator (PV-TEG) systems can recover waste heat from PV modules, but performance relies on maintaining a sufficient temperature difference (delta T) across thermoelectric modules. Excessive PV temperature reduces output and limits TEG benefits, making thermal management critical. This study evaluated finned aluminum heatsinks on a hybrid PV-TEG system using two 5 Wp monocrystalline panels with sixteen TEC1-12706 modules, eight connected in series beneath each panel. Three configurations were tested: no heatsink, 4-fin, and 11-fin heatsinks. Experiments were conducted under 100 W LED illumination with data logged every 2 min for 2 h. Voltage, current, and temperature were measured via INA219 and DS18B20 sensors connected to an Arduino acquisition system, and overall efficiency calculated from output power and incident irradiance. Results showed that heatsinks improved efficiency from 0.64 percent (no-heatsink) to 0.83 percent (4-fin) and 0.87 percent (11-fin). The 11-fin configuration produced the highest average power (0.2148 W) and largest delta T (11.57 degree C). Increasing fin count enhances heat dissipation, lowers TEG cold-side temperature, and improves overall electrical output. These findings provide practical guidance for the design and optimization of small-scale PV-TEG systems, supporting enhanced energy recovery and efficient thermal management in future applications. Keywords: hybrid PV-TEG system- aluminum fin heatsink, passive cooling, energy efficiency, electrical power Share Link | Plain Format | Corresponding Author (Syafrima Wahyu)

51	Energy and Environmental Physics	ABS-125
Investigating Cold Pools over West Sumatra Using BAM-Net Observations Tuti Alawiya (a), Marzuki Marzuki (a*), Dariusz B. Baranowski (b) a) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Andalas, Padang, 25163, Indonesia *marzuki[at]sci.unand.ac.id b) Department of Atmospheric Physics, Institute of Geophysics, Polish Academy of Sciences, Ksi&#281-cia Janusza 64, 01-452 Warszawa, Poland Abstract The Barisan Anai Meteorological NETwork (BAM-Net) consists of five stations in West Sumatra: BAM-Net01 (Padang Pariaman), BAM-Net02 (Sicincin), BAM-Net03 (Anai), and BAM-Net04 & BAM-Net05 (Padang Panjang). This study investigates convective cold pools and their role in convection propagation over West Sumatra using BAM-Net observations from January to December 2025. Cold pools were detected using surface temperature drops and wind anomalies. Results show that wind-only events dominated (2,025 events), compared to 170 temperature-only events. A total of 170 cold pool events (simultaneous temperature drop and wind gust) were identified. Spatially, the highest number of cold pool events occurred at coastal BAM-Net01 (61 events), followed by BAM-Net02 (37), BAM-Net03 (40), BAM-Net04 (21), and inland BAM-Net05 (11), indicating stronger convective activity near the coast. Most cold pool events occurred during early morning (12:00-15:00 local time). Sequential events across multiple stations on the same day suggest propagation of convective systems either from coastal to inland regions or vice versa. These findings demonstrate that cold pools play an important role in organizing and propagating convection over western Sumatra. Keywords: BAM-Net- Cold pools- Convection- Propagation- West Sumatra. Share Link | Plain Format | Corresponding Author (tuti alawiya)

52	Energy and Environmental Physics	ABS-127
Please JDesign and Development of a Lux Meter Prototype Based on Automatic Measurement Point Determinationust Try to Submit This Sample Abstract Imam Arif Rahardjo, Faried Wadjdi, Parjiman, Imam Nursyahied, Sakirah, Ory Lehhan Fadhilla Pane Universitas Negeri Jakarta Abstract Measurement of indoor lighting intensity is generally still performed manually using portable lux meters, where measurement points are determined based on user estimation. This approach may lead to inconsistencies in measurement results, particularly in rooms with varying sizes and configurations. This study aims to design and develop a lux meter prototype based on automatic measurement point determination to improve the accuracy, efficiency, and consistency of lighting measurements. The proposed system integrates a light intensity sensor with a microcontroller and an automatic coordinate determination mechanism based on room dimensions and standard measurement point distribution methods. The prototype is capable of identifying measurement points, acquiring illumination data, and storing measurement results in real time. System performance was evaluated under various lighting conditions and room dimensions. The experimental results demonstrate that the proposed prototype can automatically determine measurement points with good positional accuracy and provide stable illumination readings compared to conventional manual methods. Furthermore, the system accelerates the measurement process and minimizes operator subjectivity and human error. The proposed prototype is expected to provide an alternative solution for building lighting audits, energy efficiency evaluations, and the implementation of automated lighting monitoring systems in smart buildings. Keywords: lux meter, lighting measurement, automatic measurement point determination, light intensity sensor, automation, energy audit, smart building Share Link | Plain Format | Corresponding Author (imam arif rahardjo)

53	Energy and Environmental Physics	ABS-128
Energy Audit to Enhance Environmental Sustainability in Jonggol District Imam Arif Rahardjo, Faried Wadjdi, Aris Sunawar, Parjiman, Sakirah Universitas Negeri Jakarta Taruna Bangsa School Abstract Energy consumption in buildings and public facilities has become one of the major contributors to environmental degradation and increased greenhouse gas emissions. Therefore, energy audits play an important role in identifying energy consumption patterns and improving energy efficiency to support environmental sustainability. This study aims to conduct an energy audit in the Jonggol District area to evaluate energy utilization conditions and identify potential energy saving opportunities in several public and administrative buildings. The audit process includes data collection on electrical energy consumption, lighting systems, air conditioning usage, and operational equipment through direct measurements and field observations. The collected data were analyzed to determine the Energy Consumption Intensity and evaluate the effectiveness of existing energy usage practices. The results indicate that several buildings still exhibit inefficient energy utilization, particularly in lighting and cooling systems, resulting in unnecessary energy consumption. Recommendations such as the implementation of energy efficient lighting technology, optimization of operational schedules, and increased awareness of energy conservation practices are proposed to improve energy performance. The study demonstrates that energy audits can serve as an effective approach to support environmental sustainability by reducing energy waste, lowering operational costs, and minimizing environmental impacts in the Jonggol District area. Keywords: energy audit, environmental sustainability, energy efficiency, energy consumption intensity, building energy management, Jonggol District, energy conservation Share Link | Plain Format | Corresponding Author (imam arif rahardjo)

54	Energy and Environmental Physics	ABS-135
Strategic Optimization of Circular Economy Implementation in Urban Community Waste Management: A SWOT Analysis of TPS 3R Rawasari, Central Jakarta Dwi Atmanto, Irah Kasirah, Tri Handayani, Eti Herawati, Aniesa Puspa Arum Universitas Negeri Jakarta, Jakarta, Indonesia Abstract Urban community waste management in metropolitan areas continues to face major challenges due to rising waste generation, limited recycling infrastructure, and low public participation in waste segregation. Although the circular economy concept has been promoted through TPS 3R programs in Indonesia, its implementation in densely populated urban communities remains suboptimal because of institutional, technological, and behavioral constraints. This study aims to formulate strategic optimization efforts for implementing a circular economy in urban community waste management at TPS 3R Rawasari, Central Jakarta. The research employed a quantitative descriptive approach, using SWOT analysis and the IFAS and EFAS matrices. Data were collected from 75 respondents, consisting of community members, TPS 3R employees, operational managers, and environmental stakeholders, through questionnaires, interviews, and observations. The results showed that the IFAS score reached 3.18, indicating strong internal capabilities, particularly in community participation, managerial commitment, and waste segregation programs, while the EFAS score of 3.05 reflected significant external opportunities from government circular economy policies, increasing environmental awareness, and collaboration with recycling industries. Based on the SWOT matrix, TPS 3R Rawasari was positioned in Quadrant I (aggressive growth strategy), indicating that strengths should be maximized to capture opportunities. Strategic priorities include strengthening digital-based waste monitoring systems, improving employee technical competencies, expanding community education programs, enhancing partnerships with recycling businesses, and optimizing leadership-driven waste governance. Quantitative findings also indicated that 76% of respondents supported technology-based waste management innovation, and 81% emphasized the need for continuous environmental education. The study implies that institutional strengthening, stakeholder collaboration, and community-based environmental education are essential for optimizing circular economy implementation in urban communal waste management systems. Keywords: Circular economy, SWOT analysis, TPS 3R, urban waste management, sustainability. Share Link | Plain Format | Corresponding Author (Dwi Atmanto)

55	Energy and Environmental Physics	ABS-137
Performance Measurement and Energy Yield Analysis of Rooftop Photovoltaic Systems on State University Buildings in Tropical Urban Climate: A Case Study of Universitas Negeri Jakarta Ervina Maulida1 , Syafrima Wahyu2, Puji Suharmanto3, Maulana Amirul Adha4, Retno Dwi Lestari5, Khoiruz Zahra6 1,4 Faculty of Economics and Business, Universitas Negeri Jakarta, Indonesia 2,6 Faculty of Mathematics and Natural Sciences, Universitas Negeri Jakarta, Indonesia 3 Management Business Graduate School, Universiti Tun Abdul Razak, Kuala Lumpur, Malaysia 5 Faculty of Education, Universitas Negeri Jakarta, Indonesia Abstract This study examines the performance measurement and energy yield analysis of a rooftop photovoltaic (PV) system for the Faculty of Mathematics and Natural Sciences (FMIPA) building at Universitas Negeri Jakarta following the removal of net metering under Indonesian Ministerial Regulation (Permen ESDM) No. 2/2024. The proposed system utilizes 180 m2 of unobstructed rooftop space, enabling the installation of a 28.6 kWp monocrystalline PV system. The analysis evaluates annual energy production, levelized cost of electricity (LCOE), net present value (NPV), internal rate of return (IRR), and payback period under a conservative self-consumption scheme aligned with the current regulatory framework. Based on Jakarta^s solar irradiance of 1,750 kWh/m2/year and a performance ratio of 0.78, the system is estimated to produce 39.8 MWh annually, equivalent to a specific yield of 1,392 kWh/kWp/year, while reducing approximately 24 tCO2 emissions each year. With an investment cost of Rp 14 million/kWp and an electricity tariff of Rp 1,699.53/kWh, the system achieves an LCOE of Rp 1,244/kWh, an NPV of Rp 119 million, an IRR of 11.0 percent, and a payback period of 8.8 years over a 25-year project lifetime. Findings indicate that campus-scale PV deployment remains economically feasible despite the elimination of net metering. Keywords: Rooftop solar photovoltaic, Energy yield analysis, Performance ratio, Campus sustainability Share Link | Plain Format | Corresponding Author (Ervina Maulida)

56	Energy and Environmental Physics	ABS-148
Implementation of IoT-Based Public Street Lighting System Using Solar Energy and LoRa Technology Syufrijal Syufrijal, Rafiuddin Syam, Rimulyo Wicaksono, Fikry Nur Septa Universitas Negeri Jakarta Abstract In this modern era, renewable energy sources are crucial for reducing dependence on limited fossil fuels and the ever-increasing cost of electricity generation. One of the most effective ways to reduce electricity consumption and high operational costs in public street lighting systems is to use solar power as the primary power source. Solar Power Plants (PLTS) have become an environmentally friendly and efficient solution to meet energy needs in various sectors. Public street lighting plays a crucial role in improving the safety and comfort of road users at night. However, maintenance of street lighting systems often faces problems such as damage to some street lamps that is not quickly detected. This can lead to prolonged inoperability of street lamps and create discomfort for road users, and even increase the risk of accidents. Therefore, this study aims to design and develop a solar-powered public street lighting system utilizing LoRa technology, based on the Internet of Things. This study uses an experimental method. This monitoring system comprises an LDR sensor to detect light intensity, a LoRa module for long-distance communication, and a microcontroller to process and transmit data to a central server. Data from the sensor is used to determine whether the street light is on or off, and then sent to the control center for analysis. Based on the study^s results, LoRa technology can be utilized for wireless communication between street lighting points, resulting in low power consumption. The condition of street lighting can be monitored remotely in real-time on a website via the internet. Keywords: Solar street lighting, LoRA, IoT, Solar Panel, Microcontroller, ESP32 Share Link | Plain Format | Corresponding Author (syufrijal syufrijal)

57	Energy and Environmental Physics	ABS-162
Research opportunities for pyrolysis technology to convert plastic waste into energy: Hybrid SLR and Bibliometric Analysis Siti Ayu Kumala, Didik Nur Huda, Popi Purwanti, Sri Mayanty, Andry Fitrian Universitas Indraprasta PGRI Abstract Pyrolysis technology isn^t new technology in Indonesia. Research has been ongoing since 2016, but it^s still very limited. Pyrolysis is a thermochemical decomposition technology to convert materials such as plastic waste into fuel. The author^s aim in conducting this SLR research is as preliminary research to better understand this pyrolysis technology as a whole based on existing relevant research. The Systematic Literature Review is appropriate for synthesizing existing research and helping to identify gap, trend and future research direction while providing evidence-based insight that can influence policy, practice and further research. There are 61 articles was analysed from scopus database with PRISMA Method. Based on result of analysed, trend on pyrolysis has increased from 2022 to the present. Future research ideas include plastic-biomass combinations, reactor design, catalysts used, and applications on a larger scale than just the laboratory Keywords: Pyrolysis, Plastic waste, SLR Share Link | Plain Format | Corresponding Author (Siti Ayu Kumala)

58	Energy and Environmental Physics	ABS-164
Impact of Peat River Water Quality Deterioration on Chemical Demand in Municipal Drinking Water Treatment Wetri Febrina1, Andiyan Andiyan2,3*, Nanik Astuti Rahman4, Nyimas Yanqoritha5, Lilla Puji Lestari6 and Iin Arianti7 1Department of Industrial Engineering, Institut Teknologi dan Bisnis Riau Pesisir, Dumai, Indonesia. 2Department of Architecture, Universitas Winaya Mukti, Bandung, Indonesia 3Doctoral Student, Architecture Program, Department of Architecture and Planning, Universitas Gadjah Mada, Yogyakarta, Indonesia 4Departement Chemical Engineering, Institut Teknologi Nasional Malang, Malang,Indonesia 5Department of Industrial Engineering, Universitas Prima Indonesia, Medan, Indonesia 6Department of Mechanical Engineering, Universitas Maarif Hasyim Latif, Sidoarjo, Indonesia 7Department of Civil Engineering, Politeknik Negeri Pontianak, Pontianak, Indonesia Abstract Peatland ecosystems are highly vulnerable to land use changes and hydrological disturbances. In Riau Province, Indonesia, peat rivers function as the main source of raw water for municipal supply systems. However, drainage, land conversion, and recurrent peat fires have accelerated the leaching of organic matter and mobilization of metals into surrounding water bodies. This study evaluates the quality of peat river water as a raw water source and interprets its characteristics as indicators of environmental degradation within the catchment. Key parameters analyzed include pH, color, turbidity, and chemical oxygen demand (COD), which were compared against national raw water quality standards. The results reveal elevated color intensity, acidic pH, and high turbidity, reflecting humic substance release linked to peat oxidation and land disturbance. Increased coagulant demand during treatment highlights operational challenges caused by watershed degradation. These findings suggest that peat river water quality represents not only a technical constraint for treatment but also a critical environmental signal of ecosystem decline. Therefore, integrated watershed management and peatland restoration are essential to secure sustainable raw water supplies and reduce long-term treatment burdens while supporting broader ecological resilience. Keywords: Peat Water, Environmental Degradation, Raw Water Quality, Municipal Water Treatment, Coagulant. Share Link | Plain Format | Corresponding Author (andiyan andiyan)

59	Energy and Environmental Physics	ABS-168
Experimental Evaluation of Baffle and Louvre Muffler Geometries on Noise Attenuation, Fuel Consumption, and Exhaust Emissions in a Spark-Ignition Engine Bagus Anggraini, Warju, Rio Adi Trisna, Ata Syifa, Sudirman Rizky 1. Universitas Negeri Jakarta 2. Universitas Negeri Surabaya 3. PGRI Gresik Abstract Muffler geometry plays a critical role in controlling exhaust noise while influencing engine fuel consumption, back pressure, and exhaust emissions. This study experimentally evaluates the effects of baffle and louvre muffler configurations on noise attenuation, fuel consumption, and exhaust emissions in a Toyota Kijang 5K spark-ignition engine. Three muffler configurations were compared: the standard muffler, a redesigned baffle-type muffler, and a redesigned louvre-type muffler. Tests were conducted at engine speeds from 1000 to 5000 rpm with 500 rpm intervals under controlled operating conditions. Noise level, fuel consumption, and exhaust emissions were measured according to ISO/FDIS 5130:2006(E), SNI 7554:2010, and SNI 09-7118.1-2005, respectively. The results showed that the baffle muffler reduced noise by 0.75%, fuel consumption by 10.53%, and CO and HC emissions by 7.44% and 2.51%, respectively. The louvre muffler achieved higher noise attenuation and fuel-saving performance, reducing noise by 1.56%, fuel consumption by 12.80%, and CO and HC emissions by 7.35% and 5.83%, respectively. Overall, the louvre configuration provided the best compromise between acoustic attenuation and fuel consumption, while the baffle configuration showed slightly better CO reduction. Keywords: baffle muffler- louvre muffler- noise attenuation- fuel consumption- exhaust emissions- spark-ignition engine. Share Link | Plain Format | Corresponding Author (Bagus Anggraini)

60	Energy and Environmental Physics	ABS-183
The Experimental Study On Straight Heat Pipe Performance With Different Working Fluids For Automobile Passive Cooling Applications Ragil Sukarno*, Muhammad Samudera Zahran, Rizky Nahdatul, Riyadi, Eko Arief Syaefudin, Danar Hari Krisyono Department of Mechanical Engineering, Universitas Negeri Jakarta, Jl. Rawamangun Muka, Jakarta Timur 13220, Indonesia Abstract The air conditioning system in a car^s cabin is essential for ensuring passenger comfort. On the other hand, the energy requirements for the AC system are very high. The use of heat pipes as energy-recovery equipment in HVAC systems in the building has proven to be efficient. Most commercial heat pipes currently employ water as their working fluid. However, improvements in heat pipe performance are urgently needed. The study aims to determine the effect of different working fluids and filling ratio on the thermal performance of heat pipe. The working fluids in heat pipes were varied to include deionized water, methanol, and acetone, with a filling ratio of 20%. The heat pipe used was made of copper with a total length of 700 mm and an outer diameter of 10 mm. The results show that heat pipe with acetone yields the best thermal performance compared to deionized water and methanol, by the lowest thermal resistance. These results are expected to serve as a guide for selecting heat pipe working fluids and filling ratio in the automobile passive cooling applications. Keywords: heat pipe, working fluids, temperature, thermal resistance, passive cooling Share Link | Plain Format | Corresponding Author (Ragil Sukarno)

Page 2 (data 31 to 60 of 239) | Displayed ini 30 data/page
<< PREV 1 2 3 4 5 6 7 8 NEXT >>

Powered By Konfrenzi Ultimate 1.832M-Build9 © 2007-2026 All Rights Reserved