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All Journal Journal of Natural Sciences and Mathematics Research Al-MARSHAD: Jurnal Astronomi Islam dan Ilmu-Ilmu Berkaitan Jurnal Polimesin
Muztaba, Robiatul
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Agriculture, Biological Sciences & Forestry Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemistry Control & Systems Engineering Education Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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Mineralogical classification and impact simulation of the Punggur (H7-Melt Breccia) Meteorite, Indonesia Muztaba, Robiatul; Danni Gathot Harbowo; Hakim Luthfi Malasan
Journal of Natural Sciences and Mathematics Research Vol. 11 No. 2 (2025): December
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/jnsmr.v11i2.29459

Abstract

Meteorite falls in Indonesia are rarely examined through systematic scientific analysis, resulting in limited documentation of fall events and incomplete classification of recovered specimens. The Punggur meteorite fall of 28 January 2021 reportedly produced at least five fragments. This study addresses that gap by analyzing two fragments (PM-01 and PM-02) to confirm their extraterrestrial origin and to characterize their physical, chemical, and mineralogical properties. Physical characterization involved measurements of density, magnetic susceptibility, and surface morphology. The chemical composition was determined using X-ray fluorescence (XRF), while microscopic imaging was employed to compare fusion-crust features with interior textures. A web-based meteoroid-impact modeling tool was further employed to estimate the atmospheric entry behavior and environmental effects of the fall. The result is that PM-01 has dimensions of 13 × 6.5 × 8 cm, a volume of 419 mL, a mass of 2200 g, and a density of 5.25 ± 0.26 g/cm³. PM-02 measures 25 × 23 × 16 cm, with a volume of 443 mL, a mass of 1820 g, and a density of 4.06 ± 0.06 g cm⁻³. Modeling results indicate that post-airburst fragments retained a residual velocity of approximately 16.2 km s⁻¹, while the airburst released an estimated 2.12 × 10¹⁰ J of energy (0.51 × 10⁻⁵ megatons). The shock wave reached observers 1.78 minutes after the event, accompanied by a maximum wind velocity of 0.0422 m s⁻¹ and sound levels near 25 dB—consistent with witness reports and the observed impact crater. Microscopic and XRF analyses reveal coarse-grained textures with high concentrations of Fe, Si, and Mg. PM-01 contains 23.55% Fe, 20.18% Si, and 12.48% Mg, whereas PM-02 contains 48.09% Fe, 25.06% Si, and 10.21% Mg. Thus, this finding indicates that the specimen’s mineralogy is dominated by olivine ((Mg, Fe)₂SiO₄), confirming that it aligns with the classification of an H7 melt breccia.
Comparative Study of Observation with Theoretical Contrast using the Schaefer and Crumey Methods on the Image Result Observation Using OZT-ALTS Robotic Telescope Muztaba, Robiatul; Mufidanisa, Yasmin
Al-Marshad: Jurnal Astronomi Islam dan Ilmu-Ilmu Berkaitan Vol 11, No 2 (2025): Al-Marshad
Publisher : University of Muhammadiyah Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/jam.v11i2.25614

Abstract

Observing the crescent moon (hilal) is crucial as it significantly impacts religious activities, particularly for the Muslim community. However, there are challenges associated with hilal observation due to its appearance as a young crescent moon, making it very small apparent size, resulting in low visibility. Additionally, hilal observations are conducted before sunset when the sky still retains brightness, causing a narrow contrast between the moon's light and the background sky. This research aims to compare the contrast values obtained from observing the hilal with the OZT-ALTS Robotic Telescope to theoretical hilal values. Two theoretical contrast methods are examined in this study. The observed contrast values show an increase over time, albeit fluctuating due to cloud interference. The Schaefer contrast also increases over time, with values similar to observed contrast. The Crumey contrast decreases approaching dusk but increases after sunset. Spearman correlation analysis is used to investigate the relationship between each contrast. Observation contrast and Schaefer show a positive Spearman correlation of 0.1413. However, the contrast between observation and Crumey shows a negative correlation of -0.0603. The correlation between Schaefer and Crumey also resulted in a negative correlation of -0.8943. Theoretical contrast in this study only shows the ideal model at the time of observation because dynamic environmental factors are difficult to model, thus the relationship between observed and theoretical contrast is weak. The theoretical contrast in this study does not can be used as a reference in hilal observation
Performance and efficiency analysis of a 1600 Wp PV system: investigation of thermal, system configuration, and exergy aspects Suwarti, Suwarti; Herlambang, Yusuf Dewantoro; Sumarno, F. Gatot; Margana, Margana; Hermawan, Baktiyar Mei; Al Rasyid, Zya Jamaluddin; Pradana, Wisnu Dyka; Muztaba, Robiatul
Jurnal Polimesin Vol 24, No 2 (2026): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i2.7808

Abstract

A hybrid photovoltaic system with a total installed capacity of 1.6 kWp, composed of monocrystalline and polycrystalline modules, was experimentally evaluated under tropical conditions. The energy storage system employs a 72V bank comprising lithium-ion and lead-acid batteries. Hourly experimental measurements were conducted, and exergy analysis based on the Second Law of Thermodynamics was applied to quantify irreversible losses. It is revealed that the system’s energy efficiency ranges from 3.33% to 8.67%. The peak efficiency occurred in the afternoon, coinciding with lower panel temperatures and greater direct power delivery. Quantitative exergy analysis further identified a maximum exergy destruction of 8486.88 W at the irradiance peak, with the lowest exergetic efficiency dropping to 3.61% due to thermal irreversibilities. Additionally, operational monitoring revealed a critical synchronization failure between the lithium Battery Management System (BMS) and the Solar Charge Controller (SCC) during low-voltage states, necessitating manual intervention for recovery. These findings highlight that thermal management and component synchronization are the primary bottlenecks for system reliability in tropical environments.
Co-Authors Al Rasyid, Zya Jamaluddin Danni Gathot Harbowo F. Gatot Sumarno, F. Gatot Hakim Luthfi Malasan Hermawan, Baktiyar Mei Margana Margana Mufidanisa, Yasmin Pradana, Wisnu Dyka Suwarti Suwarti Yusuf Dewantoro Herlambang