Journal of Aceh Physics Society
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Parameters Estimation of Time-Integrated Activity Biokinetic Data using Monoexponential Function
Full text linkFault Structures and Lithological Boundaries Study on Weh Island Using Horizontal Gravity Analysis
Full text linkOptical Properties and Band Gap Analysis of MAPbI3 Perovskite Layer doped Phenethylammonium Iodide (PEAI) in Solar Cells Applications
Full text linkDevelopment of Semiconductor Electrical Conductivity Prediction System through Integration of Machine Learning and Solid State Physics Theory for Electronic Material Design
Full text linkAcoustic properties of gypsum-palm panel and foam concrete-palm panel
Full text linkThis study aims to determine the acoustic properties of gypsum panel, gypsum-ijuk panel, ijuk-gypsum panel, foam concrete panel, and foam concrete-ijuk panel. The size of panel was 1 m x 1 m with a thickness of 0.02 - 0.03 m. The measurement of the sound absorption coefficient was carried out using the reverberation chamber method (ISO 354-1985) for the frequency range of 125 4000 Hz. The results showed that the sound absorption coefficient fluctuated with frequency.Gypsum panel has the highest sound absorption coefficient of 0.42 at 125 Hz and the lowest 0.05 at 400 Hz. Ijuk panel has the highest sound absorption coefficient at 2000 Hz which is 0.97 and the lowest at 200 Hz which is 0.09. The sound absorption coefficient of the combined panel of ijuk with gypsum (ijuk above and gypsum below) is 0.85 at 2500 Hz and 0.06 at 315 Hz. Gypsum and ijuk composite panels (gypsum above and ijuk below) have the highest sound absorption coefficient of 0.93 at 125 Hz and 0.09 at 315 Hz. Foam concrete panel has the highest sound absorption coefficient at 160 Hz with a value of 0.91 and the lowest at a frequency of 315 Hz with a value of 0.08. Foam concrete panel combined with palm oil (foam concrete on top and ijuk below), the sound absorption coefficient is 0.86 at 800 Hz and 0.15 at 500 Hz. The results of this study show that the sound absorption coefficient can be improved by combining a number of materials. Composite panels of foam concrete-ijuk and gypsum-ijuk have the potential to be applied for sound absorber materials
Identification of liquefaction potential in Kampung Melayu Bengkulu based on water level depth (watertable)
Full text linkAbstrak. Wilayah Kampung Melayu memiliki kondisi litologi batuan yang tersusun atas formasi undak alluvium (Qat) yang terdiri dari pasir, lempung, lanau, dan kerikil yang bersifat lepas sehingga dapat memicu terjadinya fenomena likuifaksi apabila terjadi gempa bumi. Penelitian ini bertujuan untuk mengetahui potensi likuifaksi berdasarkan nilai resisitivitas litologi batuan bawah permukaan bumi dan kedalaman muka air tanah (watertable) pada 40 titik Sounding di daerah penelitian dengan menggunakan metode Vertical Electrical Sounding (VES) konfigurasi Schlumberger. Hasil penelitian menunjukkan bahwa lapisan bawah permukaan di Kecamatan Kampung Melayu terdiri dari batuan alluvium, mencakup lempung, kerikil, pasir, napal, air payau, dan air tanah, dengan nilai resistivitas berkisar antara 0 hingga 508 .m. Keberadaan formasi alluvium ini menjadi ancaman yang serius pada saat terjadi gempa bumi yang dapat bepotensi terjadinya likuifaksi. Kedalaman muka air tanah (watertable) di wilayah ini relatif dangkal, berkisar antara 1 hingga 25 meter, dengan nilai resistivitas antara 5,1 hingga 40 .m. Adanya zona jenuh air yang dangkal dan struktur batuan alluvium menunjukkan potensi resiko likuifaksi.Abstract. The Kampung Melayu area has rock lithology conditions which are composed of alluvium step formations (Qat) consisting of loose sand, clay, silt and gravel which can trigger liquefaction phenomena when an earthquake occurs. This research aims to determine the liquefaction potential based on the lithological resistivity values of the earth's subsurface rocks and the depth of the groundwater table (watertable) at 40 sounding points in the research area using the Schlumberger configuration Vertical Electrical Sounding (VES) method. The research results show that the subsurface layer in Kampung Melayu District consists of alluvium rock, including clay, gravel, sand, marl, brackish water and groundwater, with resistivity values ranging from 0 to 508 .m. The existence of this alluvium formation poses a serious threat during an earthquake which could potentially cause liquefaction. The depth of the groundwater table (water table) in this area is relatively shallow, ranging from 1 to 25 meters, with resistivity values between 5.1 and 40 .m. The existence of shallow water saturated zones and alluvium rock structures indicate a potential risk of liquefaction
Mikrozonasi kerentanan seismik di kawasan Kabupaten Lebong Provinsi Bengkulu berdasarkan hasil uji mikrotremor
Full text linkKabupaten Lebong merupahkan salah satu daerah rawan gempa bumi, karena terdapat Sesar Sumatra dan Sesar Pelabai yang melintas dikawasan ini. Penelitian ini bertujuan untuk menganalisis potensi bahaya gempa bumi berdasarkan hasil uji mikrotremor menggunakan metode Horizontal to Vertikal Spectral Ratio (HVSR). Pengukuran dilakukan sebanyak 106 titik yang tersebar di Kecamatan Amin, Bingin Kuningan, Lebong Atas, Lebong Sakti, Lebong Selatan, Lebong Utara, Pinang Belapis, Rimbo Pengadang, Topos, Pelabai dan Uran Jaya. Parameter yang di analisis meliputi faktor amplifikasi ( A 0 ), frekuensi dominan ( f 0 ), periode dominan ( T 0 ) dan indeks kerentanan seismik ( K g ). Hasil analisis menunjukkan bahwa indeks kerentanan seismik dengan kategori tertinggi dengan rentang nilai 5 sampai dengan lebih dari 10 berada di Kecamatan Pinang Belapis, Pelabai, Lebong Selatan, Topos, Rimpo Pegadang, dan Uram Jaya dimana pada kecamatan tersebut berjenis tanah sangat padat dan batuan lunak serta tanah lempung tebal lunak. Bangunan yang berpotensi mengalami resonansi pada saat gempa terjadi adalah bangunan berlantai 1 sampai dengan 4. Hal ini disebabkan karena frekuensi alami bangunan yang sama dengan frekuensi getaran yang dialami oleh tanah
Electrical Resistivity Tomography (ERT) for investigating subsurface structures in the karst area of the Ek Leuntie Cave, Aceh Province
Full text linkEk Leuntie Cave, in the southern city of Banda Aceh, Aceh Province, is recognized as an educational media based on geopark sites because it holds a 7400-year paleotsunami track record. As a karst area, Ek Leuntie Cave is vulnerable to the impact of geological disasters such as earthquakes, sinkholes and subsidence. As an effort to reduce the negative impact of geological disasters, geophysical studies have been applied in the Ek Leuntie Cave Karst area. The study aims to identify the subsurface geological structure of the Karst area. The identification was carried out using the Electrical Resistivity Tomography (ERT) method of Wenner-Schlumberger configuration applied to two measurement trajectories that have South-North and West-East directions in front of the Ek Leuntie Cave door. ERT data acquisition results were then modeled in inversion using Res2Dinv software to produce a 2D model of the subsurface geological structure of the Ek Leuntie Cave karst area based on variations in rock resistivity values. Interpretation of subsurface geological structure modeling is validated with shallow drilling data (Hand Auger). The inversion modeling results show that the rock resistivity value in the Ek Leuntie Cave area reaches a depth of 30 m which has a resistivity value of 0 - 1000 m. The results of the interpretation of resistivity values and validation of drill data show that the Ek Leuntie Cave area is covered by a layer of sand with fine to coarse texture and the layer below is a layer of limestone at a depth of 0.4 meters with a resistivity value of 50 - 250 m. Limestone generally shows porosity with the possibility of caves or pores in the rock formation at Ek Leuntie Cave, making it vulnerable to damage from earthquakes, landslides, and subsidence. The results of the study are expected to provide updated information in efforts to develop the Ek Leuntie Cave geopark area
Identification of Landslide-prone Areas on the Road Connecting Kaur Regency, Bengkulu Province to South Oku Regency, South Sumatra Province Using the Microtremor Method
Full text linkMuara Sahung District, Kaur Regency, is an area with a high level of landslide disasters. These incidents often cut off the connecting transportation route between Kaur Regency, Bengkulu Province, and South Oku Regency, South Sumatra Province. This research aims to analyze the potential for landslide disasters in this area. We used the Horizontal to Vertical Spectral Ratio (HVSR) technique to analyze microtremors and identify landslide-prone areas in this research. A total of 13 measurement points with a distance of 13 km between points are located in Serdang Indah Village, Luas District, Ulak Bandung Village, Bukit Makmur and Sumber Makmur, Muara Sahung District, Kaur Regency, Bengkulu Province. This was carried out using the PASI Gemini-2 portable seismometer device in the Kaur Regency area with hilly contours on the left and right of the road. The analysis results include the amplification factor (A0), dominant frequency (f0), and soil vulnerability index (Kg). The results of the analysis and calculations show that the highest landslide risk value among all points is at point (KR-4, KR-5) in Ulak Village, Bandung (KR-7). Bukit Makmur Village and (KR-9) Serdang Indah Village, where this location is on a road with steep hilly contours that often cause landslides