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All Journal Jurnal Penelitian Fisika dan Aplikasinya (JPFA) WARTA ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika JOURNAL ONLINE OF PHYSICS JPSE (Journal of Physical Science and Engineering) Jurnal Geocelebes Panrita Abdi - Jurnal Pengabdian pada Masyarakat JPPPF (Jurnal Penelitian dan Pengembangan Pendidikan Fisika) Martabe : Jurnal Pengabdian Kepada Masyarakat Abdimas Umtas : Jurnal Pengabdian kepada Masyarakat PengabdianMu: Jurnal Ilmiah Pengabdian kepada Masyarakat Indonesian Physical Review Jurnal Kumparan Fisika Al-Khidmat : Jurnal Ilmiah Pengabdian Kepada Masyarakat Jurnal Inovasi Pengabdian Masyarakat Pendidikan JAPI: Jurnal Akses Pengabdian Indonesia Jurnal Pengabdian Pada Masyarakat
Elfi Yuliza
Department Of Physics, Faculty Of Mathematics And Natural Sciences, University Of Bengkulu
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PHYSICAL DISTANCING ALARM SYSTEM BASED ON PROXIMITY SENSOR AND MICROCONTROLLER Yuliza, Elfi; Ekawita, Riska; Vionita, Vionita; Fauzi, Muhammad Khafid; Sari, Vera Fuspita; Rahmayanti, Handika Dany
Indonesian Physical Review Vol. 4 No. 2 (2021)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v4i2.85

Abstract

Keeping an interaction distance between 1 to 2 m is one of the health protocols during the COVID-19 pandemic. This attempt was made to reduce the spread of the Coronavirus. On the other hand, this health protocol activity is often overlooked, whether intentionally or not. According to the mechanism of the Coronavirus spreading in the form of droplets that comes out during communication, sneezing, or coughing, maintaining distance can be the best effort to minimize the transmission of this virus. Therefore, the availability of a simple, accurate and user-friendly physical distancing alarm system could be a solution in the implementation of this health protocol. In this study, a prototype of a physical distancing alarm based on a distance sensor and a microcontroller in the form of an identity card was developed. Several steps are conducted in developing of this system, namely designing the instrumentation system and testing the performance of the system. System performance is tested through variations in the distance and angle of the objects. The measurement results show that the system can detect objects in front of the sensor up to a distance of 2.8m and an angle of  for a distance of 1m. The measurement using different angles of objects was performed for objects on the left and right sides of the sensor. In addition, a warning alarm will be on when the distance of the object exceeds the allowed distance.  
COMPARISON OF INFRARED AND OPTOCOUPLER SENSORS PERFORMANCE FOR LAB-SCALE RPM MEASUREMENT SYSTEM Afifah Amatullah, Elin Nur; Ekawita, Riska; Yuliza, Elfi
Indonesian Physical Review Vol. 5 No. 2 (2022)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v5i2.150

Abstract

In utilizing various alternative energy, generators are used to convert alternative energy into electrical energy, for example, biomass, wind, and hydroelectricity. Generally, the measurements made on the generators are rotational speed measurements in the form of revolutions per minute (RPM). In developing lab-scale alternative power sources, the availability of generators with complete quality and specifications is still minimal, including RPM capacity. Therefore, the measurement which can read the RPM accurately, digitally, and automatically is needed. However, the measurement tools available are still manual, not automatic, and prone to parallax errors. Hence, a digital and automatic RPM measurement was developed in this study. Two different sensors were used to develop digital RPM based on a microcontroller. The stages obtained started with electronic system development, calibration, and testing of lab-scale renewable energy systems. The measurement can be read from the infrared and optocoupler sensors on the Archimedes turbine. The measurement results showed that the use of the Optocoupler sensor is more accurate than the infrared sensor. This is based on the data obtained from calibration and testing results on the Archimedes turbine. This RPM measurement is digital and real-time.
PHYSICOCHEMICAL PROPERTIES ANALYSIS OF LOCAL CERAMICS WITH ACTIVATED CARBON ADDITIVE BASED ON RUBBER FRUIT SHELLS AS THERMAL INSULATORS Kurniawan, Chandra; Yuliza, Elfi; Irkhos, Irkhos; Fitriani, Dyah
Indonesian Physical Review Vol. 6 No. 3 (2023)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v6i3.232

Abstract

Many building materials that function as insulators to maintain indoor temperature stability during hot weather have been developed. One of them is porous ceramics applied to building walls as heat absorbers. Research related to the manufacture of porous ceramics began to emerge to find the optimal composition when applied as an insulator that can absorb heat well. In general, porous ceramics use activated carbon as a pore agent. Activated carbon can be obtained by carbonating agricultural wastes such as coconut shells, hazelnut shells, rubber fruit shells, rice husks, and cocoa shells. Research continues to develop in finding the best-activated carbon base material according to the required material characteristics. Researchers will take advantage of the abundant potential of local natural resources. The method used to make porous ceramics is to mix clay and activated carbon with a clay-carbon composition ratio of 100:0, 90:10, 80:20, 70:30, 60:40, and 50:50. The sample is made by mixing the two materials and then printed by dry pressing method with a load of 5 tons held for 10 minutes. After the sample is dried at room temperature, it is sintered at 900oC with a holding time of 3 hours. Next, the sample is characterized by determining density, porosity, and water absorption and then tested for thermal properties. After that, the surface morphology and elements in the sample are seen. The optimum composition of clay-carbon mixture is 70:30 grams.  Ceramics using activated carbon from rubber fruit shells are suitable as building construction materials as heat insulators because they can absorb heat up to 500oC.
DRIED NATA DE COCO WITH WATER ABSORPTIVITY COMPETING SILICA GEL Rahmayanti, Handika Dany; Yuliza, Elfi; Amalia, Nadya; Abdullah, Mikrajuddin
Indonesian Physical Review Vol. 7 No. 3 (2024)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v7i3.383

Abstract

Nata de Coco (NDC)  is a network of cellulose fibers that traps abundant of water. If a freshly made NDC is dried to remove nearly all trapped water, we will get a very hygroscopic material. This material is potential for making water adsorber that might compete the well known silica gel. NDC was prepared using standard methods and its water absorption was investigated. Dried NDC was used in this study. For comparison, we also investigated the water absorption of several commercial NDC. To determine its business prospects, the water absorption of silica gel was also investigated. The results showed that dried NDC could absorb water vapor comparable to the absorption of commercial silica gel. This suggests that dry NDC has the potential as an alternative water vapor absorber in food packaging. The advantages of the NDC compared to silica gel are safer and environmentally benign, and easily decomposed.
Pelatihan Pengelolaan Sampah di SD Negeri 02 Kota Bengkulu Sebagai Upaya Peningkatan Literasi Lingkungan Bagi Siswa Sekolah Dasar Yuliza, Elfi; Rini, Dyah Setyo; Fransiska, Herlin; Rosdalena, Nutia; Valeriyan, Reyvo; Purwanto, Eko Heru; Syah, Muhammad Taufiqurrahman
JAPI (Jurnal Akses Pengabdian Indonesia) Vol 8, No 2 (2023)
Publisher : Universitas Tribhuwana Tunggadewi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/japi.v8i2.4856

Abstract

Permasalahan sampah di Kota Bengkulu merupakan masalah klasik dan krusial yang belum ada solusinya. Padahal, masalah ini sudah berimbas pada berbagai aspek kehidupan seperti kesehatan, ekonomi, pariwisata, kebencanaan dan lain sebagainya. Salah satu penyebab belum teratasinya masalah sampah ini berkaitan dengan budaya dan karakter masyarakat yang belum peduli terhadap sampah dan efeknya terhadap lingkungan. Salah satu upaya yang dapat dilakukan untuk menumbuhkan budaya dan karakter peduli lingkungan adalah melalui pemberian dan peningkatan literasi lingkungan sejak dini. Pemahaman tentang pengelolaan sampah sudah mulai dilakukan di SD Negeri 02 Kota Bengkulu, namun pandemi Covid-19 yang melanda 2 tahun terakhir telah merubah tatanan dalam penerapan program pengelolaan sampah. Saat ini, untuk melakukan penerapan terkait pemahaman peduli lingkungan, pihak sekolah memiliki keterbatasan pada belum terintegrasinya tema khusus literasi lingkungan pada kurikulum. Disamping itu, terdapat tiga angkatan yang belum mendapatkan pemahaman terkait peduli lingkungan. Berdasarkan permasalahan ada, dua masalah utama yang ditemukan, yaitu (1) metode penyampaian dan penerapan materi peduli lingkungan yang aktif, interaktif, menarik serta mudah dipahami oleh siswa kelas III SD, (2) kekurangan fasilitas bank sampah dengan pemisah jenis serta pengelolaan sampah menjadi barang yang bernilai guna. Kedua permasalahan ini dapat diselesaikan dengan menerapkan sains teknologi masyarakat melalui penyediaan media pembelajaran yang lebih interaktif menggunakan video animasi edukasi, poster-poster dengan ilustrasi yang menarik, penyediaan bank sampah, dan pendampingan pemanfaatan sampah. 
Impact of El Niño - Southern Oscillation (ENSO) and Indian Ocean Dipole (IOD) on Air Temperature in Bengkulu City Edkayasa, Mardho Tillah; Yuliza, Elfi; Lizalidiawati, Lizalidiawati
JURNAL GEOCELEBES Vol. 9 No. 1: April 2025
Publisher : Departemen Geofisika, FMIPA - Universitas Hasanuddin, Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70561/geocelebes.v9i1.43409

Abstract

Bengkulu City has experienced rising air temperatures due to climate variability events, particularly ENSO and IOD. This study analyzes the relationship between ENSO, IOD, and air temperature in Bengkulu over the past 20 years (2004-2023) using data from Meteorological and Climatology stations, as well as ONI and DMI indices from NOAA. Pearson and multiple correlation analyses show a temperature increase of 0.08-0.1°C per year. ENSO has a stronger influence than IOD, especially on maximum temperature ( r = 0.28-0.38). To strengthen the analysis, multiple linear regression was applied, revealing that ONI had a statistically significant positive effect on average air temperature, while DMI showed a weaker and insignificant influence ( r = 0.10-0.11). A phase-based composite analysis revealed that average temperatures peaked during El Niño combined with Positive IOD phases, highlighting their synergistic warming effect, with maximum temperature reaching 35.9°C (February 2019), and the lowest minimum temperature recorded at 18°C (September 2019). The temperature increase during El Niño poses risks such as prolonged dry seasons, increased drought, and disruption of coastal ecosystems. Therefore, adaptation measures such as early warning systems and water resource management must be integrated into regional planning, particularly in agriculture and health sectors in Bengkulu.
Co-Authors Afifah Amatullah, Elin Nur Ahmad Azmi Nasution Aini Nurul Almadi, Ismail Fahmy Bangun, Abel Melido Chandra Kurniawan, Chandra Dyah Setyo Rini Edkayasa, Mardho Tillah Ekawati, Riska Eko Heru Purwanto Fauzi, Muhammad Khafid Fitriani, Dyah Habibullah, Ahmad Dhuha Herlin Fransiska Irkhos Irkhos Lestari, Resma Puji Lizalidiawati Lizalidiawati MAHDALYA, ELLIN ERNITA Melisa, Wery Mikrajuddin Abdullah Muhammad Taufiqurrahman Syah Muhammad Yuliansyah Putra Mutia Raudhatul Zahra Nadya Amalia Nasution, Ahmad Azmi Nolla Kusumawardani Nur Kholis Nursakinah Suardi Nutia Rosdalena Okta Sari Purwanto, Eko Heru Rahmat Awaludin Salam Rahmayanti, Handika Dany Reyvo Valeriyan Rida Samdara Rina Suthia Hayu Rini, Dyah Setyo Riska Ekawita Riska Ekawita Riska Ekawita Riska Ekawita Rosdalena, Nutia SAGALA, MONAESA Saputra, Rahmat Sari, Vera Fuspita Setiawan, Redo Shalih Muhammad Abdul Azhim SIHOMBING, YOSIA PANDU Sipriyadi Suardi, Nursakinah SULISTIANI, EVI Sultan Nanda Alamsyah Supiyati . Suwarsono Suwarsono Suwarsono Suwarsono Syafitri, Nur Linda Syah, Muhammad Taufiqurrahman Ulandari, Tresi Pitria Valeriyan, Reyvo Vera Fuspita Sari Vera Vionita, Vionita Wery Melisa Wibowo, Risky Hadi Wulandari, Gustina Dwi Yazid Ismi Intara Yazid Ismi Intara Yosia Pandu S Zafran Afif