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All Journal JFA (Jurnal Fisika dan Aplikasinya) Darmabakti Cendekia: Journal of Community Service and Engagements Jurnal Abdi: Media Pengabdian Kepada Masyarakat Indonesian Applied Physics Letters
Pujiyanto Pujiyanto
Departemen Fisika, Universitas Airlangga - Indonesia
Humanities Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Physics Public Health Social Sciences Other

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Journal : Indonesian Applied Physics Letters

 1 
Sodium Sulfate (Na2SO4) Detection Using Graphene Coated Microfiber M Yasin; Pujiyanto Pujiyanto; D Anngita; I A Fanany
Indonesian Applied Physics Letters Vol. 1 No. 1 (2020): June
Publisher : Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/iapl.v1i1.21336

Abstract

We investigate the coating of graphene onto the silica microfiber sensor for sodium sulfate measurement at room temperature. The graphene obtained from graphene-polylactic acid filament was coated onto the microfiber based on drop casting methods. In this work, the graphene acts as cladding to interact with analyte as well as functions to trap either sodium cation or sulfate anion and increases the effective refractive index of the cladding. The sensor has  a good sensitivity of 0.82 dBm/% and resolution of 1.16 %. The sensitivity and resolution of the sensor were increased by the coating of graphene layer. 
Prototype Development of Myoelectrics Signal-Based Exoskeleton Anggrian Riska Amelia Shabrine; Pujiyanto Pujiyanto; Akif Rahmatillah
Indonesian Applied Physics Letters Vol. 2 No. 1 (2021): June
Publisher : Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/iapl.v2i1.28296

Abstract

Diffable is incompleteness or abnormality accompanied by consequences for specific functions. The method used is tapping on the hamstring and hamstring muscles quadriceps to determine the resulting voltage—muscle signal tapping using Electromyograph (EMG) and Ag-AgCl electrodes. Average current-voltage contraction and relaxation are used as threshold values to drive the servo motor. This study indicates the tension when the muscle contracts are in the range of 4 volts while the relaxation time is 0.4 volts. Then it can be concluded that the voltage when the muscle is contracted is more significant than when it is relaxed. Using different tension during contraction and relaxation in normal subjects showed that the different tension could drive the prototype exoskeleton.
Co-Authors Anggrian Riska Amelia Shabrine D Anngita Endah Purwanti Franky Chandra Satria Arisgraha Herri Trilaksana I A Fanany M Yasin M. Arief Bustomi Moh Yasin Rahmatillah, Akif Retna Apsari Samian Supadi Supadi