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Rahmayanti, Handika Dany
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Journal : Indonesian Physical Review

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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.  
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.
Co-Authors A.A. Ketut Agung Cahyawan W Abdul Majid Adryans Ahmad Khoiri Akmalia, Nurul Annisa Jasmine Apit Fathurohman Ardiani, Septia Cempaka, Putri Surya Edy Wibowo Elfi Yuliza Euis Sustini Fatiatun, Fatiatun Fauzi, Muhammad Khafid Firdaus Firdaus Haryasena Gusti Andayu HM Didik Ikhwannanda, Dias Kartika, Tipri Rose Khairurrijal Khairurrijal Kusnanto Mukti Wibowo Lukman Nulhakim Mamat Rokhmat Mikrajuddin Abdullah Mochammad Mahardika Mulyana, Raina Munir, Rahmawati Munir, Rahmawati Nadya Amalia Novitri Hastuti Novitri Hastuti, Novitri Nurul Akmalia Putri, Saarah Rahmawati Rahmawati Rahmawati, Rahmawati Riska Ekawita Sari Setyaning Tyas Sari, Vera Fuspita Septia Ardiani Septia Ardiani Situngkir, Yessy Yerta Sparisoma Viridi Suryani, Meuthia Tommy Prasetya Kana Trifajar Yurmama Supiyanti Vionita, Vionita Widiargo, Antonius Edi Yakob, Freddy Yeni Nurhasanah Yurmama, Tri Fajar Yurmama, Trifajar Yuyun Khairunisa