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All Journal Indonesian Journal of Pharmaceutical Science and Technology International Journal of Natural Science and Engineering Indonesian Physical Review
Handayana, I Gusti Ngurah Yudi
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Computer Science & IT Education Engineering Medicine & Pharmacology Physics

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Isolation of Chitosan Biopolymer from Nacre (Pinctada maxima) as Bone Scaffold Candidate Taufik S, Ahmad; Alawiyah, Geby; Rahayu, Susi; Kurniawidi, Dian W; Handayana, I Gusti Ngurah Yudi; Cahyawati, Triyana Dyah; Purnaning, Dyah; Amin, Muhamad
Indonesian Journal of Pharmaceutical Science and Technology Vol 12, No 1 (2025)
Publisher : Indonesian Journal of Pharmaceutical Science and Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/ijpst.v12i1.44794

Abstract

The rising incidence of bone injuries necessitates researching and developing safe bone replacement materials. Chitosan biopolymer is one of the available materials. Because it is non-toxic, biocompatible, and biodegradable, chitosan can be employed as a bone scaffold material. According to the European Pharmacopeia 6.0 (Eur: Ph 6.0), chitosan, with a deacetylation level of more than 70%, is safe for medicinal usage. The purpose of this research was to analyze the  characteristics of chitosan isolated from nacre and the influence of nacre powder mass  on the degree of deacetylation of  chitosan. Chitosan was extracted by the processes of deproteination, demineralization, and deacetylation. Organoleptic tests, yield calculations for each stage, examination of the degree of deacetylation, creation of functional groups, and vibrational modes based on Fourier Transform Infrared (FTIR) data were performed on the isolated chitosan. The produced chitosan exhibited the properties of being beige color, odorless, and in powder form. The yield of insulation results obtained by the mass of chitosan. 3.7 % of the mass of nacre powder. The resultant chitosan has the formation of hydroxyl (OH) and amine (NH2) groups and vibrational stretching and bending modes. The variation in nacre powder mass throughout the isolation procedure altered the degree of deacetylation of the resultant chitosan and the wave number spectra of the hydroxyl (OH) and amine (NH2) groups. Chitosan, with a mass of 80 grams of nacre powder and a value of 76.94%, exhibited the highest degree of deacetylation. Considering that the functional groups generated in chitosan are comparable to those in bone, chitosan is a potential material for bone scaffolds.
Automated Wildlife Recognition Using OpenCV for Conservation at Rinjani National Park Handayana, I Gusti Ngurah Yudi; Sudiarta, I Wayan; Setiawan, Budi; Hadi, Islamul; Marzuki, Marzuki; Huda, Lalu Sahrul; Angraini, Lily Maysari; Illahi, Ramadian Ridho
International Journal of Natural Science and Engineering Vol. 8 No. 3 (2024): Oktober
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/ijnse.v8i3.101773

Abstract

This study presents the design and validation of an AI-based camera-trap system for wildlife monitoring at the border of Rinjani National Park, Indonesia. The system uses the YOLOv4 framework integrated with OpenCV to detect long-tailed macaques (Macaca fascicularis) in real-time. A total of 269 annotated images were used, including 202 for training, 17 for validation, and 50 for testing. The model was trained using Google Colaboratory and achieved a detection accuracy of 92.83%. Image pre-processing and labeling were conducted via Roboflow, and the model was optimized for potential deployment on a Raspberry Pi platform. Although physical deployment was not conducted, the system design supports low-power embedded implementation for field use. The results indicate that the proposed method can reliably detect camouflaged and partially occluded monkeys, suggesting its potential for mitigating human–wildlife conflict through smart conservation technology.
ELECTROMAGNETIC WAVE EQUATION ON DIFFERENTIAL FORM REPRESENTATION Handayana, I Gusti Ngurah Yudi
Indonesian Physical Review Vol. 1 No. 1 (2018)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (489.375 KB) | DOI: 10.29303/ipr.v1i1.12

Abstract

One of the indispensable part of the theoretical physics interest is geometry differential. This one interest of physical area has been developed such as in electromagnetism. Maxwell's equations have been generalized in two covariant forms in differential form representation. A beautiful calculus vector in this representation, such as exterior derivative and Hodge star operator, lead this study. Electromagnetic wave equation has been expressed in differential form representation using Laplace-de Rham operator. Explicitly, wave equation shows the same form in Minkowski space-time like vector representation. This study is able to introduce us to learn application of  differential form in physics.
Co-Authors Ahmad Taufik S Alawiyah, Geby Budi Setiawan Cahyawati, Triyana Dyah Huda, Lalu Sahrul I Wayan Sudiarta ISLAMUL HADI Kurniawidi, Dian W Marzuki Marzuki Muhamad Amin Purnaning, Dyah Ramadian Ridho Illahi Susi Rahayu