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All Journal Jurnal Fisika FLUX CHEDS: Journal of Chemistry, Education, and Science
Sirait, Ratni Sirait
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Biochemistry, Genetics & Molecular Biology Chemistry Earth & Planetary Sciences Education Materials Science & Nanotechnology Physics

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Analysis of Soil Vulnerability Level Due to Earthquake in Tarutung Region and Its Surroundings Using Probabilistic Seismic Hazard Analysis Method Pratiwi, Nindya Mirandani; Lubis, Lailatul Husna; Sirait, Ratni Sirait; Sipayung, Reinhard Sipayung
Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat Vol 21, No 1 (2024): Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/flux.v21i1.17157

Abstract

The geotectonic and geological conditions of the Tarutung region, which is crossed by the active Renun and Toru fault lines, cause the region to experience frequent earthquakes. Determination of the maximum ground acceleration (PGA) value is a very important method to see the vulnerability of the soil due to earthquakes in the region. This research uses the PSHA method with a probability of exceeding 2% PE for 50 years or a return period of 2500 years. The data used is earthquake data with a magnitude of 4.3 - 6.4 Mw and a depth of 10 - 250 km starting from 1971 - 2022. This data was obtained from two sources, namely the IRIS catalog and data from BMKG Geophysical Station Class I Deli Serdang. The vulnerability analysis obtained changes the value of peak ground acceleration in bedrock at the condition of T = 0 s (PGA), T = 0.2 s (short period), and T = 1 (long period) with a probability of exceeding 2% in 50 years in bedrock. The results of this study obtained maximum ground acceleration values of 0.3 g - 0.9 g for PGA (T = 0 s), 0.4 g - 0.9 g for a short period (T = 0.2 s), 1.0 g - 1.2 g for long period (T = 1 s). Areas with the highest ground acceleration values are located in Pahe Julu District, Pahae Jae District, and Simangumban District
PEMANFAATAN HYLOCEREUS POLYRHIZUS SEBAGAI BAHAN PEMBUATAN SELULOSA NANOKRISTAL DENGAN METODE HIDROLISIS ASAM Hakim, Ibnu; Sirait, Ratni Sirait; Lubis, Ridwan Yusuf
CHEDS: Journal of Chemistry, Education, and Science Vol 8, No 1 (2024)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v8i1.9123

Abstract

Tujuan penelitian ini adalah untuk: (i) Mengkarakterisasi nanokristal selulosa kulit buah naga. (ii) Mengetahui pengaruh konsentrasi H2SO4 optimum terhadap ukuran kristal nanoselulosa kulit buah naga. Penelitian ini menggunakan metode Hidrolisis Asam dengan menggunakan 4000 gram kulit buah naga. Menggunakan larutan NaOH 7%. Larutan NaClO sebanyak 7,5%. Larutan H2O2 + NaOH 1%. Larutan H2SO4 sebanyak 50%. Disentrifugasi pada kecepatan 7500 rpm Variasi hidrolisis asam menggunakan larutan H2SO4 adalah 55% dan 50%. Hasil penelitian karakterisasi nanokristal selulosa menghasilkan kandungan 55% mempunyai indeks kristalinitas yang sedikit lebih tinggi (71%) dibandingkan dengan nanokristal selulosa 50% (68%) secara berbeda hal ini menunjukkan bahwa nanokristal selulosa 55% mempunyai indeks kristalinitas yang sedikit lebih tinggi. Struktur kristal yang lebih teratur. Ukuran partikel selulosa nanokristalin 55% memiliki rentang yang sedikit lebih sempit (5-30 μm) dibandingkan dengan selulosa nanokristalin 50% (7-40 μm). Sedangkan pengaruh konsentrasi H2SO4 menggunakan variasi 55% dan 50% menghasilkan ukuran nanokristal selulosa yang berbeda.   
Co-Authors Hakim, Ibnu Lubis, Lailatul Husna Lubis, Ridwan Yusuf Pratiwi, Nindya Mirandani Sipayung, Reinhard Sipayung