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Jurnal Fisika Unand
Published by Universitas Andalas
ISSN : 23028491     EISSN : 26862433     DOI : https://doi.org/10.25077/jfu
Core Subject : Science, Engineering,
Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics
Makalah yang dapat dipublikasikan dalam jurnal ini adalah makalah dalam bidang Fisika meliputi Fisika Atmosfir, Fisika Bumi, Fisika Intrumentasi, Fisika Material, Fisika Nuklir, Fisika Radiasi, Fisika Komputasi, Fisika Teori, Biofisika, ataupun bidang lain yang masih ada kaitannya dengan ilmu fisika.
Arjuna Subject : Fisika dan Astronomi - Fisika Nuklir dan Molekuler, dan Ooptik
Articles 12 Documents
 1   2 
Search results for , issue "Vol 14 No 5 (2025)" : 12 Documents clear
Alat Deteksi Denyut Jantung Tipe Fingertip dengan Sensor Non-invasif untuk Masyarakat Pedesaan (Studi Kasus Desa Raharja, Banjar, Jawa Barat) Maria Evita; Prihatini, Jihan; Sawita, I Kadek Agus Sara; Kamal, Muhammad; Aprianti, Nur Asiah
Jurnal Fisika Unand Vol 14 No 5 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.5.500-506.2025

Abstract

Heart disease is one of the most lethal diseases in the world, including in Indonesia. This disease affects both urban and rural populations Lack of access to medical equipment particularly for heart rate detection, is the reason for developing a fingertip-type heart rate device using a cheap and convenient non-invasive sensor. This system consists of an infrared sensor equipped with an analog filter, an operational amplifier and Arduino Uno microcontroller for signal processing, and an LCD for displaying the heart rate. After calibration, this system was tested on 20 participants in Desa Raharja to validate its performance. In two phases of testing, the average accuracy obtained ranged from 3.28% to 8.08% in phase 1, and from 2.89% to 31.73% in phase 2. Most of the results have met the accuracy standards for heart rate detection equipment. The shortcomings of this research allow for further development in future studies.
Pengaruh Penyimpanan dan Pemanasan Terhadap Perubahan Ukuran Nanopartikel Parfum Campuran Minyak Royal Musk dan Minyak Atsiri Lili yang Disintesis Menggunakan Surfaktan Polimer PEG-40 HCO Winarti, Ratu Sesillia; Saragih, Horasdia
Jurnal Fisika Unand Vol 14 No 5 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.5.516-525.2025

Abstract

The purpose of this study was to produce perfume nanoparticles made from a mixture of royal musk oil and lily essential oil that can be dispersed in an aqueous medium and to investigate their size stability after storage and heating. The perfume nanoparticles were synthesized using an atomization technique with PEG-40 HCO as a surfactant, and their stability was evaluated through storage for up to 120 days and heating at temperature up to 45 °C. The results showed that storage for 120 days significantly increased the average particle diameter and its standard deviation. Heating also caused a significant increase in nanoparticle size. These findings indicate that the size of the perfume nanoparticles was not stable, as the zeta potential and the presence of PEG-40 HCO surfactant could not provide sufficient electrostatic and steric protection. Consequently, coalescence and Ostwald ripening occurred in the nanoparticles.

Page 2 of 2 | Total Record : 12

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