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All Journal JFA (Jurnal Fisika dan Aplikasinya) Jambura Physics Journal Jurnal Fisika dan Terapannya Dewantara Journal of Technology Computational and Experimental Research in Materials and Renewable Energy (CERiMRE) Jurnal Ilmiah Wahana Pendidikan MALLOMO: Journal of Community Service BIOCHEPHY: Journal of Science Education Inovasi Fisika Indonesia (IFI) Jurnal Pijar MIPA
Andi Indra Wulan Sari Ramadani
Universitas Negeri Gorontalo
Religion Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

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KARAKTERISTIK FISIKA MIKROPLASTIK PADA AIR DAN IKAN MUJAIR (Oreochromis mossambicus) DI DANAU LIMBOTO Ismail, Sri Yanti N.; Jahja, Mohamad; Ramadani, A Indra Wulan Sari; Supu, Idawati; Arbie, Asri; Kurniasari, Septiana; Gafur, Nurfitri Abdul
BIOCHEPHY: Journal of Science Education Vol. 5 No. 1 (2025)
Publisher : MO.RI Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52562/biochephy.v5i1.1473

Abstract

Mikroplastik merupakan salah satu jenis pencemaran yang berbahaya baik di darat maupun ekosistem perairan. Dengan menurunnya kualitas perairan merupakan salah satu permasalahan yang berada pada lingkungan danau Limboto yang disebabkan oleh pencemaran dan pendangkalan kondisi danau Limboto saat ini sangat memprihatinkan. Penelitian ini bertujuan untuk mengetahui karakteristik mikroplastik yang terkandung pada air dan ikan mujair (Oreochromis mossambicus)  pada perairan Danau Limboto.  Penelitian ini menggunakan alat mikroskop USB Traveler untuk mengidentifikasi bentuk dan warna mikroplastik. Berdasarkan hasil penelitian yang dilakukan Mikroplastik yang ditemukan pada air dan ikan mujair yaitu fiber, pellet dan fragmen. Warna mikroplastik pada ikan mujair dan air danau Limboto berwarna hitam, biru, kuning, hijau, merah cokelat dan putih.
Karakterisasi Sifat Fisik Bioplastik Berbasis Pati Kulit Pisang Goroho dengan Penambahan ZnO Devita Irawati Putri; Jahja, Mohamad; Yunginger, Raghel; Latief, Muh. Fachrul; Ramadani, Andi Indra Wulan Sari
JFT : Jurnal Fisika dan Terapannya Vol 12 No 1 (2025): Juni 2025
Publisher : Universitas Islam Negeri Alauddin Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/jft.v12i1.53106

Abstract

An effective way to address the plastic waste problem is by minimizing the use of non-biodegradable plastics. One approach is to develop biodegradable plastic packaging that is environmentally friendly. This research used Goroho banana peel starch, this type of banana is used because it has good potential with a starch content of 80.89%. In this research, variations in ZnO concentration of 1%, 2%, 3%, 4%, and 5% w/w were conducted. This research aims to determine the characteristics of physical properties of bioplastics with the addition of ZnO. This research uses a laboratory experimental method through several processes, namely goroho banana peel starch extraction and bioplastic manufacturing. The results indicated that varying concentrations of ZnO significantly influenced the physical and biodegradation properties of the bioplastic products. The physical properties of the bioplastics produced have met the Indonesian National Standard (SNI) for water uptake of 21.5% and biodegradation of 60 days. FTIR results show that the functional groups of bioplastics are identical to the constituent functional groups, namely starch, so that their properties resemble the properties of their constituents, which are easily degraded. The most optimum bioplastic is BPZ 2 with the addition of ZnO at 2% w/w, which produces water uptake of 1.859% and degradation time of 12 days.
Thermal Performance of Public Green Space using Palm Fiber Net-Based Green Canopy and Passion Fruit (Passiflora Edulis) Vegetation Muksin, Engelina; Jahja, Mohamad; Setiawan, Dewa Gede Eka; Ramadani, A Indra Wulan Sari; Djafar, Abdi Gunawan; Latief, Muh. Fachrul
Computational And Experimental Research In Materials And Renewable Energy Vol. 8 No. 1 (2025): May
Publisher : Physics Department, Faculty of Mathematics and Natural Sciences, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/cerimre.v8i1.53398

Abstract

This study aims to evaluate the thermal performance of green canopies in public green spaces (RTH), both outdoors and indoors, as an environmentally friendly solution. The method involved measuring temperature and humidity over a five-month period with four observation intervals. The data were analyzed using the Temperature-Humidity Index (THI) and compared with thermal comfort standards based on the Indonesian National Standard (SNI). The results show that at 0% plant coverage, the THI values fall into the "comfortable to slightly uncomfortable" category during the period from 19:00 to 08:00. In contrast, at 81.25% plant coverage, THI values remain in the "comfortable to slightly uncomfortable" range from 21:00 to 09:00. Relative humidity met the SNI standard of 75%. Furthermore, the outdoor temperature decreased by 4.9 °C, while the indoor temperature decreased by 3.5 °C. These findings indicate that the presence of green canopies, particularly in private green spaces, significantly reduces both outdoor and indoor temperatures as the percentage of plant coverage increases.Keywords: Public Green Space, Green Canopy, Temperature Humidity Index, Indonesian National Standards
Properti Cakrawala Peristiwa pada Lubang Hitam Schwarzschild dalam Latar Alam Semesta Tertutup yang Berekspansi Latief, Muh. Fachrul; Ramadani, Andi Indra Wulan Sari
Jurnal Ilmiah Wahana Pendidikan Vol 10 No 9 (2024): Jurnal Ilmiah Wahana Pendidikan
Publisher : Peneliti.net

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.13603701

Abstract

A closed universe model containing a constant and positive vacuum energy density (cosmological constant) has been studied. By analyzing the McVittie metric, it can be shown directly that for an expanding universe, the Hubble parameter at the event horizon for all static symmetric black holes is the same. As for the cosmological constant, black holes will not expand as the universe expands. In addition, the existence of the Hubble voltage is also explained which can affect the speed of the universe's expansion in certain areas.
Studi Sifat Fisik dan Kekuatan Tekan Material Komposit Serat Eceng Gondok dan Kulit Jagung Ramadani, Andi Indra Wulan Sari; Latief, Muh. Fachrul
Jurnal Ilmiah Wahana Pendidikan Vol 10 No 11 (2024): Jurnal Ilmiah Wahana Pendidikan 
Publisher : Peneliti.net

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.13605106

Abstract

The high demand for materials with unique properties such as composites, especially in increasingly massively produced structural applications, requires the industry to switch from synthetic fiber reinforced composites such as fiberglass to composites with natural fibers. The use of natural fibers as fillers not only considers their environmentally friendly properties but also the nature of natural fibers which tend to have low density so that they are expected to be able to provide unique physical and mechanical properties to engineered composite materials. This study examines how the physical properties and compressive strength of composites with epoxy matrices and two types of natural fiber fillers, namely water hyacinth and corn husks. The results of this study indicate that alkali treatment in the preparation of corn husk and water hyacinth fiber samples significantly affects the density, porosity and compressive strength of the resulting composites. In addition, the uniformity of fiber orientation and the number of fibers per unit area also contribute positively to the physical properties and compressive strength of natural fiber composite samples.
Co-Authors Abdi Gunawan Djafar Abdul Haris Aisyah Aisyah Asmiati Amir Asri Arbie Devita Irawati Putri Dewa Gede Eka Setiawan Diana Eka Pratiwi Efendi, Hasan Arif Fitriani Fitriani Gafur, Nurfitri Abdul Haris Munandar Harsano Jayadi Indriati Martha Patuti Irsan Rahman Ismail, Sri Yanti N. Jahja, Mohamad Jatnika, Jajat Juintan Pratiwi Kurniasari, Septiana Lapalutu, Tiara Latief, Muh. Fachrul Meidji, Icha Untari Meilan Demulawa Muh Fachrul Latief Muh Fachrul Latief Muh. Nur Akbar Muhammad Yunus Muhammad Yunus Muhammad Yunus Muksin, Engelina Mursalin . Ramdhan, Mohamad Samatowa, Lukman Siti Fatimah Subaer Subaer Supu, Idawati Suriati Eka Putri Tang, Bunga