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All Journal Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics Journal of Natural Sciences and Mathematics Research Communications in Science and Technology Jurnal Ilmu Fisika Jurnal Konversi Energi dan Manufaktur Automotive Experiences PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL)
Tjahjono, Arif
Islamic State University Of Syarif Hidayatullah Jakarta
Aerospace Engineering Agriculture, Biological Sciences & Forestry Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Other

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Analysis of return period and seismic risk of Shallow Earthquake occurrence in Cianjur and surrounding areas sutrisno, sutrisno; Tjahjono, Arif; Putra, Fathin Ramadhan
Journal of Natural Sciences and Mathematics Research Vol. 9 No. 2 (2023): December
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

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Abstract

Determination of the seismic risk and return period of shallow earthquakes in Cianjur and surrounding areas is very important as a reference in earthquake disaster mitigation programs. Within this return period, structural and non-structural conditions can be prepared in stages that are ready to face disasters if the earthquake recurs. In this study used the least squares statistical method to determine the relationship between frequency and magnitude, level of risk, and earthquake return period. The earthquake data used in this study is sourced from the earthquake catalog of the United States Geological Survey (USGS) spanning 50 years (1973 – 2023). A total of 57 shallow earthquakes that occurred in Cianjur area and its surroundings at coordinates (06°-08°S and 106°-108°E) with magnitude greater or equal to 5.0 at a depth of 0-60 km were used as sample data. Based on the results of data processing and analysis, the return periods are 3.17 to 29.1 years for earthquakes with magnitudes between 5.0 and 6.0, and 29.1 to 267.38 years for earthquakes with magnitudes between 6.0 and 7.0.. Earthquake risk for 10 to 20 years with magnitude greater than 5.0 is 95.74 to 99.82 %, with magnitude greater than 6.0 is 20.09 to 49.70 %, and with magnitude 7.0 is 3.67 to 7.21 %. From the results of processing and analysis of the earthquake data, it shows that the Cianjur area and its surroundings are earthquake-prone areas with a high risk.
Microwave Absorption Performance of La0.7Sr0.3MnO3/AC Composite Material Based on Activated Carbon from Gnetum gnemon Seed Shell Priambodo, Danang Pamungkas; Saptari, Sitti Ahmiatri; Tjahjono, Arif; Manawan, Maykel T; Taryana, Yana; Hadiyawarman; Admi, Ratna Isnanita
Communications in Science and Technology Vol 10 No 2 (2025)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.10.2.2025.1727

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The 5G internet network has been proven to facilitate daily life for people and render electronic devices such as smartphones as an integral component of people's daily routine. However, in conjunction with the ease of use, there is an issue of electromagnetic radiation. To cope with this issue, magnetic and dielectric composite microwave absorber materials have been undertaken. To address this, we investigated the limitations of activated carbon composite material from Gnetum gnemon seed shells (AC) on the microwave absorption ability of (La0.7Sr0.3MnO3)1-y/(AC)y. The composite material (La0.7Sr0.3MnO3)1-y/(AC)y (y = 0; 0.3; 0.5; 0.7) was synthesized through a stirring process with a 96% ethanol catalyst using La0.7Sr0.3MnO3 synthesized by sol-gel method and activated carbon material from Gnetum gnemon seed shell (AC) synthesized by chemical activation method. The XRD and SEM characterizations indicated a single-phase structure, with smaller crystals and particles that were uniformly distributed throughout the composite sample. The presence of activated carbon grains from Gnetum gnemon seed shells (AC) were observed between the La0.7Sr0.3MnO3 grains in the composite sample. The EDS results confirmed the material’s purity. VNA characterization demonstrated that (La0.7Sr0.3MnO3)1-y/(AC)y was capable of producing two reflection loss troughs with the largest absorption percentages recorded at 82.99% and 85.82% respectively within the frequency range of 8 – 12 GHz. This research highlights the significance of controlled composite composition in enhancing microwave absorption capability, particularly in perovskite-based composites with biomass-activated carbon, which holds a considerable promise for applications in electromagnetic wave attenuation and absorption technologies.
Co-Authors A'yuni, Sayida Ma'wa Adi Chandra, Septian Admi, Ratna Isnanita Agung Sabtaji Ahmad Firdaus Ahmad Novi Muslimin Ambran Hartono Apriatin, Apriatin Cut Fitria Dwi Yudanto, Sigit Frendyta, Nadya Salsabila Hadiyawarman Haiqal, Amanda Hanuarjie, Baskan Hidayat, Dony Indriani, Fitri Karina Iwan Setiawan Juli Hartati Kumila, Biaunik Niski Lusti Nur Azizah Manawan, Maykel T Marta, Aryandi Muhammad Umar Faruqi Mujadid Al-Rabi Niken Aprilia Eka Putri Noer Syahid, Adi Nuras, Muhammad Ishaq Nurrohmad, Abian Nurul Fadilah Paristiawan, Permana Andi Perdamean Sebayang Pramesti, Firly Giska Pratama, Elfriani Dita Pria Utama, Dedi Priambodo, Danang Pamungkas Priyambodo Priyambodo Putra, Fathin Ramadhan Riki Ardiansyah, Riki Roberto, Rahadian Saprila Suherman, Mila Saptari, Sitti Ahmiatri Sukmayanti, Putri Sutrisno, Sutrisno Taryana, Yana Yunan Hasbi, Muhammad