https://journals.itb.ac.id/index.php/jmfs <p><img class="imgdesc" src="https://lppm.itb.ac.id/wp-content/uploads/sites/55/2021/08/JMFS_ITB_small.jpg" alt="" width="173" height="220" /></p> <p style="text-align: justify;"><em>Journal of Mathematical and Fundamental Sciences </em>welcomes full research articles in the area of Mathematics and Natural Sciences from the following subject areas: Astronomy, Chemistry, Earth Sciences (Geodesy, Geology, Geophysics, Oceanography, Meteorology), Life Sciences (Agriculture, Biochemistry, Biology, Health, Medical, Pharmacy), Mathematics, Physics, and Statistics. New submissions of mathematics articles starting in January 2020 are required to focus on applied mathematics with real relevance to the field of natural sciences.</p> <p style="text-align: justify;">Starting from Vol. 1, No. 1, 1961, full articles published are available online at ITB Journals and indexed by <a href="https://www.scopus.com/source/sourceInfo.uri?sourceId=21100268424&amp;origin=recordpage">Scopus</a>, <a href="https://mjl.clarivate.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&amp;ISSN=2337-5760">Web of Science (Emerging Sources Citation Index) - Clarivate Analytics</a>, <a href="https://www.scimagojr.com/journalsearch.php?q=21100268424&amp;tip=sid&amp;clean=0">Scimago JR</a>, <a href="https://doaj.org/toc/2338-5510">Directory of Open Access Journals (DOAJ)</a>, <a href="https://scholar.google.co.id/citations?hl=en&amp;user=xdqQsgUAAAAJ&amp;view_op=list_works&amp;sortby=pubdate">Google Scholar</a>, <a href="https://journals.indexcopernicus.com/Journal+of+Mathematical+and+Fundamental+Sciences,p24780956,3.html">Index Copernicus</a>, <a href="https://rzblx1.uni-regensburg.de/ezeit/searchres.phtml?bibid=AAAAA&amp;colors=7&amp;lang=en&amp;jq_type1=QS&amp;jq_term1=journal+of+mathematical+and+fundamental+sciences">The Elektronische Zeitschriftenbibliothek (EZB) by University Library of Regensburg</a>, <a href="https://atoz.ebsco.com/Titles/SearchResults/8623?SearchType=Contains&amp;Find=Journal+of+Mathematical+fundamental+Sciences&amp;GetResourcesBy=QuickSearch&amp;resourceTypeName=allTitles&amp;resourceType=&amp;radioButtonChanged=">EBSCO Open Science Directory</a>, <a href="https://asean-cites.org/aci_search/journal.html?b3BlbkpvdXJuYWwmaWQ9MTAzNzg">ASEAN Citation Index</a>, <a href="https://garuda.kemdikbud.go.id/journal/view/7389">Garba Rujukan Digital (Garuda)</a> and <a href="https://sinta.ristekbrin.go.id/journals/detail?id=667">Science and Technology Index (SINTA)</a>.</p> <p style="text-align: justify;">The journal has been also accredited for five years based on The Decree of Directorate General of Research and Development Strengthening, Ministry of Research, Technology and Higher Education of the Republic of Indonesia <a href="https://lppm.itb.ac.id/wp-content/uploads/sites/55/2021/12/Salinan-SK-Hasil-Akresitasi-Jurnal-Ilmiah-Periode-II-Tahun-2018.pdf">No. 030/E/KPT/2018</a>, dated on October 24th, 2018.</p> <p style="text-align: justify;">Published by Directorate for Research and Community Services, Institut Teknologi Bandung, in collaboration with <a href="https://www.lppm.itb.ac.id/wp-content/uploads/sites/55/2018/01/MoU-HAKI-JMFS-2018-BW.pdf">Indonesian Chemical Society (Himpunan Kimia Indonesia - HKI)</a>.</p> <p>ISSN: <a href="https://issn.brin.go.id/terbit/detail/1356660275">2337-5760</a>; E-ISSN: <a href="https://issn.brin.go.id/terbit/detail/1372762782" target="_blank" rel="noopener">2338-5510</a></p> <p><strong><u>Publication History</u></strong></p> <p><strong>Formerly known as:</strong></p> <ul> <li>ITB Journal of Science (2008 - 2012)</li> <li>Proceedings ITB Science and Technology (2003 - 2007)</li> <li>Proceedings ITB (1961 - 2002)</li> </ul> <p>Back issues also can be read online at <a href="http://journal.itb.ac.id">http://journal.itb.ac.id</a></p> Directorate for Research and Community Services (LPPM) ITB en-US Journal of Mathematical and Fundamental Sciences 2337-5760 https://journals.itb.ac.id/index.php/jmfs/article/view/19762 <p>Earthquake sources in Aceh have distinct characteristics. Understanding the seismic characteristics of each earthquake source is crucial for comprehending earthquake cycles and assessing seismic hazards. A key parameter in characterizing an earthquake source is the <em>b</em>-value, which indicates the relationship between the number of earthquakes and their magnitudes, influenced by the magnitude of completeness (Mc). The present study analyzed the seismic characteristics of two subduction zone segments and sixteen fault segments using the least squares method on selected earthquake data specific to each segment. The analysis revealed that the <em>b</em>-value ranged from 0.5 to 0.6 in the subduction zone segments and from 0.3 to 1.0 in the fault segments. These variances in <em>b</em>‑value reflect the different seismic characteristics of the earthquake sources that shape the tectonic settings in Aceh. A lower <em>b</em>-value signifies an elastic zone capable of holding higher stress levels, whereas a higher <em>b</em>-value indicates a brittle zone that can only withstand lower stress levels.</p> Abdi Jihad Vrieslend Haris Banyunegoro muksin umar marwan ramli Syamsidik Syamsidik yunita idris Andi Azhar Rusdin Copyright (c) 2024 Journal of Mathematical and Fundamental Sciences 2024-07-31 2024-07-31 56 1 1 17 10.5614/j.math.fund.sci.2024.56.1.1 https://journals.itb.ac.id/index.php/jmfs/article/view/22833 <p>Natural ingredients can have extraordinary potential as alternative medicines due to their accessibility and cost-effectiveness. Application of these ingredients should consider solubility and permeability, which determine the success of pharmaceutical characteristics formulation and biological activity indication. In this context, physical manipulation, specifically particle size reduction, is an effective strategy to address these issues. Previous research has explored active compounds in the stilbenoid group, found in the outer skin, hard shell, and endosperm of melinjo (<em>Gnetum gnemon</em> L.) seeds, functioning as antioxidant. Based on the potential as antioxidant, stilbenoid compounds, including resveratrol, contained in melinjo seed hardshell have shown significant pharmacological effects. Therefore, this research aimed to investigate the potential of melinjo seed hardshell extract as a natural antioxidant alternative by modifying the particle size through a grinding process to obtain nanoparticles. The analysis was carried out using ball milling to enhance the solubility of melinjo seed hardshell extract by increasing the saturated solubility and surface area of the particles. The results showed that the total phenol content and the antioxidant power increased significantly (p &lt; 0.05) after ball milling. Melinjo seed hardshell nanoextract is reported herein as a promising source of natural antioxidant from local Indonesian plants.</p> Marlina Indriastuti I Ketut Adnyana Rika Hartati Heni Rachmawati Copyright (c) 2024 Journal of Mathematical and Fundamental Sciences 2024-08-08 2024-08-08 56 1 18 29 10.5614/j.math.fund.sci.2024.56.1.2