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All Journal Jurnal Sains Teknologi dan Lingkungan (JSTL) Jukung (Jurnal Teknik Lingkungan) SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan International Journal of Natural Science and Engineering Jurnal Pengabdian Magister Pendidikan IPA Jurnal Pendidikan Fisika dan Teknologi EIGEN MATHEMATICS JOURNAL Kappa Journal Lambda: Jurnal Ilmiah Pendidikan MIPA dan Aplikasinya Dharma Pengabdian Perguruan Tinggi (DEPATI) Jurnal Pengabdian Inovasi Masyarakat Indonesia
Ramadian Ridho Illahi
Program Studi Fisika, FMIPA, Universitas Mataram
Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Engineering Environmental Science Health Professions Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Mathematics Medicine & Pharmacology Nursing Physics Public Health Social Sciences Other

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Isolasi Kitosan dari Cangkang Kerang Mutiara (Pinctada maxima) Menggunakan Deasetilasi Dengan Gelombang Mikro Susi Rahayu; Aulia Safitri Destrianingtyas; Ramadian Ridho Illahi; Dian W. Kurniawidi
Kappa Journal Vol 8 No 2 (2024): Kappa Journal
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v8i2.27166

Abstract

Kitosan merupakan biopolimer turunan dari hasil deasetilasi kitin, yang berkembang pesat di dunia medis saat ini. Kitosan salah satu material yang memiliki sifat anti mikroba, biokompatibel, dan biodegradable sehingga aman bagi tubuh manusia. Penelitian ini dilakukan untuk mengidentifikasi pengaruh daya gelombang mikro terhadap karakteristik kitosan. Pembuatan kitosan dengan mengisolasi kitosan dari cangkang kerang Mutiara (Pinctada maxima sp) melalui proses deproteinasi, demineralisasi, dan deasetilasi. Kitosan di analisis gugus fungsi, derajat deasetilasi, rendemen, berat molekul, dan struktur kristalnya. Pada tahapan deasetilasi mengunakan NaOH 60%. Hasil penelitian menunjukkan bahwa pemberian gelombang mikro dengan daya high selama 5 menit memperoleh nilai derajat deasetilasi tertinggi 83,40%, rendemen akhir sebesar 8,2%, dan berat molekul 222.185,94 Da, serta memiliki derajat kristalinitas sebesar 59,09%. Derajat deasetilasi kitosan meningkat seiring dengan naiknya daya gelombang mikro sedangkan berat molekul yang dihasilkan berbanding terbalik dengan derajat deasetilasi.
Solution of The Duffing Equation Using Exponential Time Differencing Method Ramadian Ridho Illahi; Marzuki Marzuki; Lalu Sahrul Hudha
Eigen Mathematics Journal Vol 7 No 1 (2024): June
Publisher : University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/emj.v7i1.195

Abstract

To describe the spring stiffening effect that occurs in physics and engineering problems, Georg Duffing added the cubic stiffness term to the linear harmonic oscillator equation and is now known as the Duffing oscillator. Despite its simplicity, its dynamic behavior is very diverse. In this research, the Exponential Time Difference method is introduced to solve the Duffing oscillator numerically. To formulate the ETD method, we were using the integration factors. It is a function which, when multiplied by an ordinary differential equation, produces a differential equation that can be integrated. This method is an effective numerical method for solving complex differential equations, especially equations that have strong non-linearity The ETD method delivers highly accurate numerical solutions for the Duffing oscillator, with minimal discrepancy from the analytical results. Through parameter variation, the ETD method's applicability extends to diverse Duffing oscillator configurations.
Co-Authors Adella Ulyandana Jayatri Alaa, Siti Alfina Taurida Alaydrus Anggriani, Ni Ketut Arif Budianto Arif Budianto Aulia Safitri Destrianingtyas Budi Setiawan Dani Syirojulmunir Dewa Dwi Pranahita Dian W. Kurniawidi Dian Wijaya Kurniawidi Fidya, Karina Alma Fitri Bimantoro Gusti Ayu Niatri Hadi, Kasnawi Al Halil Akhyar Hamidi, M. Zaenuddin Handayana, I Gusti Ngurah Yudi Hendrawan Huda, Lalu Sahrul I Wayan Sudiarta I Wayan Sudiarta I Wayan Sudiarta Intan Utami ISLAMUL HADI Juniarti, Rosita Kasnawi Al Hadi Kormil Saputra Laili Mardiana Lalu Sahrul Hudha Lily Syahana Rahim Marzuki Marzuki Marzuki Marzuki Ni Ketut Anggriani NURUL QOMARIYAH Palaivia Harman Wardi Rahadi Wirawan Suhayat Minardi Susi Rahayu Teguh Ardianto, Teguh Zahrah Ramadlan Mubarokah Zubaidi, Ariyan