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All Journal Tunas Geografi Komunikasi Fisika Indonesia JGE (Jurnal Geofisika Eksplorasi) JOURNAL ONLINE OF PHYSICS Jurnal Geocelebes Martabe : Jurnal Pengabdian Kepada Masyarakat Jurnal Kumparan Fisika Gravitasi: Jurnal Pendidikan Fisika dan Sains Jurnal Ilmiah Ilmu Terapan Universitas Jambi EINSTEIN (E-JOURNAL)
Lailatul Husna Lubis
Universitas Islam Negeri Sumatera Utara
Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Other

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IDENTIFIKASI PERCEPATAN TANAH MAKSIMUM DI WILAYAH BENGKULU DENGAN METODE KAWASHUMI Reni Nurjannah; Mulkan Iskandar; Lailatul Husna Lubis
Indonesian Physics Communication Vol 20, No 3 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.3.237-242

Abstract

Maximum soil acceleration is the greatest value of increasing soil acceleration caused by a specified period of time. Maximum ground acceleration is very important to do, to reduce the risk due to an earthquake that occurs. This research is expected to be able to determine the value of the largest increase in ground velocity and areas that have the greatest level of possible danger due to ground acceleration using the Kawashumi method. From the after effects of the investigation that has been finished, it is obtained that the maximum ground acceleration value is 661.7182528 gal and it can be seen that Muko-Muko Regency in the Bengkulu region has a risk due to high ground acceleration.
Analysis of Seismotectonic Parameters and Earthquake Return Periods in The Nias Area (1980-2021): Analisis Parameter Seismotektonik dan Periode Ulang Gempa Bumi di Wilayah Nias Tahun 1980-2021 Riski Efrina Siregar; Lailatul Husna Lubis; Ratni Sirait; Novita Sari
JURNAL GEOCELEBES Vol. 7 No. 2: October 2023
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20956/geocelebes.v7i2.22348

Abstract

The Nias Islands region is an area prone to earthquakes with a very high level of earthquake activity. One reason is the source of the subduction zone which is in the northwest of the Nias Islands. The aim of this work is to determine the b-value, seismic index, and earthquake return period using probabilistic techniques. For the years 1980 to 2021, the Meteorology, Climatology and Geophysics Agency (BMKG) published data with a magnitude of 3-6.7 and a depth (H) of 10-300 Km. The research results obtained by calculating the highest b-value is 0.791 in South Nias district and the highest a-value is in the South Nias district of 3.97. Calculation of the highest seismicity index with a magnitude of 6.7 in South Nias district with a-value of 7.223191 with an earthquake return period of 14 years.
PEMBUATAN DAN KARAKTERISASI BIOFOAM BERBBASIS KOMPOSIT SERBUK SABUT KELAPA DENGAN PEREKAT POLIVINIL ASETAT Abdul Halim Daulay; Lailatul Husna Lubis; Siti Hawa Hasibuan
EINSTEIN (e-Journal) Vol 11, No 3 (2023): EINSTEIN (e-Journal)
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/eins.v11i3.43820

Abstract

Biofoam merupakan kemasan alternatif pengganti styrofoam yang bersifat bidegradable, dapat terurai secara alami serta aman bagi kesehatan karena tidak mengandung bahan beracun. Serbuk sabut kelapa sebagai bahan dasar dalam pembuatan biofoam dan PVAc (polivinil asetat) sebagai perekat. Penelitian ini bertujuan untuk mengetahui variasi komposisi optimum material biofoam sehingga memiliki sifat fisis, mekanik, dan termal yang baik, dan untuk mengetahui laju degredasi biofoam berbasis serbuk sabut kelapa dengan perekat polivinil asetat (PVAc). Pembuatan biofoam menggunakan bahan serbuk sabut kelapa dengan perekat polivinil Asetat. Komposisi pencampuran serbuk sabut kelapa dengan perekat polivinil asetat (PVAc) yang digunakan adalah 45%:55%, 55%:45%, 65%:35%, 75%:25%, dan 85%:15%. Biofoam dicetak menggunakan cetakan akrilik lalu dikompaksi menggunakan mesil Hot Press dengan tekanan sebesar 100 MPa ditahan selama 10 menit pada suhu 70 . Metode karakterisasi yang digunakan meliputi densitas, daya serap air, degredasi, kuat tarik, modulus elastisitas, elongation at break, differential scanning calorimetry (DSC). biofoam berbasis komposit serbuk sabut kelapa dapat dihasilkan dengan perekat polivinil asetat (PVAc) sebagai aplikasi kemasan pangan yang aman dan ramah lingkungan untuk pengganti styrofoam. Pada penelitian diperoleh biofoam serbuk sabut kelapa dengan perekat PVAc menghasilkan komposisiyang optimum yaitu variasi sampel A (45% : 65%) wt dengan nilai densitas 2,332 g/m3, dan daya serap air 0,924%. Kuat tarik 0,8707 MPa, perpanjangan putus 105,097% dan modulus elastisitas 0,828 MPa. Sifat termal dengan titik leleh 451,41oC.
Co-Authors Abdul Halim Daulay Aditya Pratama Pulungan Alexander F.T Parera Anisya Agustina Arba Dluha Arwi Anti Ayundita Aulia Anggraini Aulina Madhani Saragih Evi Kusumayani Minta Ito Muhammad Razzaaq Razzaaq Mulkan Iskandar Novita Sari Novita Sari Putri Nur Hafizah Ratni Sirait Ratni Sirait Reni Nurjannah Riski Efrina Siregar Saza Amiroh Siti Hawa Hasibuan sri wulandari Ummi Khairani Siregar Wisnu Wardono Wisnu Wardono Yosi Setiawan