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All Journal Omega: Jurnal Fisika dan Pendidikan Fisika Science and Technology Indonesia Jurnal Ilmu Fisika Journal of Energy, Material, and Instrumentation Technology
Yusril Yusuf
Department of Physics, Faculty of Mathematics and Natural Sciences-Gadjah Mada University Sekip Utara, BLS 21, Bulaksumur, Yogyakarta 55281, Indonesia
Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Environmental Science Materials Science & Nanotechnology Physics

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Introducing Undergraduate Students to Nonlinear Dynamics through A Numerical Approach Nugroho, Fahrudin; Azhari, Irfan Taufiq; Yusuf, Yusril; Nurwantoro, Pekik
Omega: Jurnal Fisika dan Pendidikan Fisika Vol 4 No 2 (2018)
Publisher : Program Studi Pendidikan Fisika UHAMKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31758/OmegaJPhysPhysEduc.v4i2.45

Abstract

This paper describes a numerical method that used to solve the nonlinear Schr\"{o}dinger equation. The methods are an exponential time differencing method and a spectral method. The result indicates that at a certain parameter, fluctuation of wave function has contained chaotic dynamics. This case is expected to be used as an example for introducing numerical methods to undergraduate students on nonlinear dynamics. This introduction is deemed necessary, referring to the curriculum and syllabus used in several educational institutions in various countries that have included the topic of nonlinearity.
Penerapan Gelombang Plasma dalam Mengurangi Kadar Chemical Oxygen Demand (COD) pada Limbah Batik Melalui Corona Plasma dan Elektrokoagulasi dengan Metode Variasi Putra, Valentinus Galih Vidia; Mohamad, Juliany Ningsih; Yusuf, Yusril
Jurnal Ilmu Fisika Vol 12, No 2 (2020): Published in September 2020
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.12.2.60-69.2020

Abstract

Proses pengolahan limbah tekstil umumnya dapat berupa limbah dari proses penghilangan kanji (Desizing), penggelantangan (Scouring), pemutihan (Bleaching), dan pencelupan kain (Dyeing) serta proses pewarnaan dan pembilasan yang menghasilkan air limbah berwarna dengan COD yang tinggi. Dikarenakan kompleksitas jenis limbah tekstil, maka pemilihan metode pengolahan limbah merupakan suatu tantangan tersendiri dalam penelitian oleh beberapa peneliti. Artikel ini memperlihatkan beberapa metode pengolahan limbah dengan menggunakan metode elektrokoagulan (EC), metode plasma dan gabungan metode plasma dan elektrokoagulan. Hasil riset memperlihatkan bahwa pengabungan metode plasma dan elektrokoagulan akan lebih baik dalam penguraian air limbah dengan indikator menurunnya COD pada limbah (sebesar 240mgO2/L hingga 250 mgO2/L). Efisiensi pada metode plasma-elektrokoagulasi sebesar 42,5% - 44,8%.
FTIR, XRD, and SEM-EDX Characterization of Synthesized B-Type Carbonated Hydroxyapatite (CHAp) Based on Crab Shells Muarif, Muhamad Fajar; Yusuf, Yusril; Agipa, Ade Irmadiki
Journal of Energy, Material, and Instrumentation Technology Vol 5 No 1 (2024): Journal of Energy, Material, and Instrumentation Technology
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jemit.v5i1.241

Abstract

The synthesis and characterization of B-type CHAp based on mangrove crab shells (Scylla serrata) as a source of calcium using the precipitation method has been successfully carried out. Based on the FTIR results, the substitution of carbonate ion for phosphate, which indicates the formation of B-type CHAp, is characterized by the appearance of absorption at wave numbers (CO32-) 1426 and 875 cm-1, PO43- at wave numbers 965, 619 & 569 cm-1. The XRD results show that diffraction peaks (211), (300), and (202) appear at an angle of 2θ ranging from 31°-34°, and there is a phenomenon of a-axis contraction and c-axis expansion in the HAp lattice structure. The SEM-EDX results show that the Ca/P ratio is 1.72, and the carbonate content is 5.01 wt%. All of these parameters are characteristics of CHAp, so it can be concluded that type-B CHAp has been formed.
Synthesis of a 3D Porous Multicomponent Bioceramic Scaffold Sari, Yessie Widya; Munir, Ryaas Mishbachul; Saputra, Angga; Sari, Mona; Aminatun; Suciati, Tri; Mohamad, Che Wan Sharifah Robiah; Gunawarman; Yusuf, Yusril
Science and Technology Indonesia Vol. 9 No. 2 (2024): April
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2024.9.2.235-243

Abstract

In this study, 3D porous multicomponent bioceramic scaffolds were fabricated. Hydroxyapatite (HA) and carbonate-substituted hydroxyapatite (CHA) synthesized from Asian moon scallop shell (Amusium pleuronectes) served as the bioceramics, whereas alginate and chitosan served as the polymeric components. The study was focused on determining whether the presence of polyvinyl alcohol (PVA) in the scaffold exerted an impact. When PVA was not included, the morphological examination revealed that the samples exhibited porous structures characterized by effective pore interconnectivity and a substantial pore size. X-ray diffraction and scanning electron microscopic analyses indicated that the inclusion of PVA led to a decrease in the crystallinity, pore size, and porosity of the scaffolds. Those containing PVA exhibited porosity levels in the range of 56%–60%, and pore sizes ranged from 42 to 90 µm. These properties may provide advantages for the scaffold with respect to the ability for cell migration and cell attachment, thus enhancing new bone formation. Moreover, the compositions of HA and chemically modified HA (CHA) within the scaffold influenced the crystallinity and uniformity of the scaffold morphology. This finding suggests the potential for crafting a customized porous bioceramic scaffold based on specific compositions.
Co-Authors Agipa, Ade Irmadiki Aminatun Angga Saputra Azhari, Irfan Taufiq Fahrudin Nugroho Gunawarman Mohamad, Che Wan Sharifah Robiah Mohamad, Juliany Ningsih Muarif, Muhamad Fajar Munir, Ryaas Mishbachul Pekik Nurwantoro Putra, Valentinus Galih Vidia Sari, Mona Tri Suciati Yessie Widya Sari