Journal of Mathematical and Fundamental Sciences 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 Institute 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: 2337-5760; E-ISSN: 2338-5510</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 http://journal.itb.ac.id</p> <p><a title="SCImago Journal &amp; Country Rank" href="https://www.scimagojr.com/journalsearch.php?q=21100268424&amp;tip=sid&amp;exact=no"><img src="http://www.scimagojr.com/journal_img.php?id=21100268424&amp;title=true" alt="SCImago Journal &amp; Country Rank" border="0" /></a></p> en-US jmfs@lppm.itb.ac.id (Prof. Dr. A. Agung Nugroho) jmfs@lppm.itb.ac.id (Muhamad Abdurachman Saleh) Fri, 01 Apr 2022 00:00:00 +0700 OJS 3.2.1.0 http://blogs.law.harvard.edu/tech/rss 60 Dielectric Meta-lattices with Tunable Reflectivity https://journals.itb.ac.id/index.php/jmfs/article/view/17277 <p class="Abstract">We report a study on the reflective performance of a dielectric meta-lattice formed by a one-dimensional periodic arrangement of silicon nanotubes. It was found that switching from transparent state to reflective state can be done by simply varying one optical parameter of the meta-lattice. The meta-lattice was shown to be capable of providing near-zero and near-unity reflectance at any desired wavelength, even in oblique incidence cases. The results are thus very promising for the development of future optical devices.</p> Suhandoko Dwi Isro, Agoes Soehianie, Alexander Agustinus Iskandar Copyright (c) 2022 Journal of Mathematical and Fundamental Sciences https://journals.itb.ac.id/index.php/jmfs/article/view/17277 Mon, 28 Feb 2022 00:00:00 +0700 Analytical Solution for Bending and Free Vibrations of an Orthotropic Nanoplate based on the New Modified Couple Stress Theory and the Third-order Plate Theory https://journals.itb.ac.id/index.php/jmfs/article/view/16916 <p>In the present work, the equations of motion of a thin orthotropic nanoplate were obtained based on the new modified couple stress theory and the third-order shear deformation plate theory. The nanoplate was considered as a size-dependent orthotropic plate. The governing equations were derived using the dynamic version of Hamilton’s principle and natural boundary conditions were formulated. An analytical solution in the form of a double Fourier series was obtained for a simply supported rectangular nanoplate. The eigenvalue problem was set and solved. It was analytically shown that the displacements of the median surface points in the plane of the plate do not depend on the material length scale parameters in the same directions; these in-plane directional displacements depend on the material length scale parameter in the out-of-plane direction only. On the other hand, the out-of-plane directional displacement depends on the length scale parameter in the plane directions only. The cross-section rotation angles depend on all length scale parameters. It was shown that the size-dependent parameters only have a noticeable effect on the deformed state of the plate if their order is not less than the order (<em>plate height</em>)<sup>-1</sup>.</p> Marina Barulina, Dmitry Kondratov, Sofia Galkina, Olga Markelova Copyright (c) 2022 Journal of Mathematical and Fundamental Sciences https://journals.itb.ac.id/index.php/jmfs/article/view/16916 Mon, 28 Feb 2022 00:00:00 +0700 Prediction of Carbon Monoxide Concentration with Variation of Support Vector Regression Kernel Parameter Value https://journals.itb.ac.id/index.php/jmfs/article/view/14838 <p lang="en-US" align="justify">Human and industrial activities produce air pollutants that can cause a decline in air quality. In urban areas, transportation activities are the main source of air pollution. One of the emitted air pollutants produced by transportation is carbon monoxide (CO). The understanding of CO concentration is crucial since its overabundance beyond a certain limit will have a negative impact on human health and the environment. In this study, the support vector regression (SVR) method was used to predict CO concentration. The purpose of this study was to predict the hourly CO concentration in the Ujung Berung district, Bandung City, West Java, Indonesia with optimal prediction accuracy. An experiment was carried out by modeling the CO concentration with varying kernel parameter values to obtain accurate prediction results. The suitability of the values between error (<em>ɛ</em>), a trade-off constant (<em>C</em>), and variation mismatch (<em>γ</em>) is vital to obtain optimal prediction results. The results showed that the best prediction accuracy value was 97.68% with kernel parameter values <em>ɛ</em> = 0.02, <em>γ</em> = 30, and <em>C</em> = 0.006. These results may lead to proper decision making on environmental issues and can improve air pollution control strategies.</p> Halawa Ernwati, Yazid Bindar, Acep Purqon, Wahyu Srigutomo Copyright (c) 2022 Journal of Mathematical and Fundamental Sciences https://journals.itb.ac.id/index.php/jmfs/article/view/14838 Wed, 02 Mar 2022 00:00:00 +0700