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All Journal Jurnal Sains Materi Indonesia Metal Indonesia Mesin Molekul: Jurnal Ilmiah Kimia Jurnal Metalurgi dan Material Indonesia Jurnal Ilmu dan Inovasi Fisika Metalurgi
Ramelan, Aditianto
Material Science And Engineering Research Group, Faculty Of Mechanical And Aerospace Engineering, Institut Teknologi Bandung
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Wristband Inovatif Penghilang Kantuk Saat Belajar dengan Sensor Detak Jantung Berbasis IOTc Azka Zakiyyatuddin; Aldo, Dian Afif; Aditianto Ramelan
JIIF (Jurnal Ilmu dan Inovasi Fisika) Vol 2, No 2 (2018)
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (342.175 KB) | DOI: 10.24198/jiif.v2i2.19714

Abstract

Salah satu permasalahan yang dihadapi oleh masyarakat Indonesia adalah keadaanmengantuk ketika melaksanakan berbagai aktivitas. Salah satunya seperti yang biasa dialami oleh pelajar ketika belajar atau ujian. Oleh karena itu, diperlukan sebuah alat untuk menghilangkan rasa kantuk pada saat menjalankan aktivitas. Kanmuru Wristband merupakan produk penghilang kantuk dengan basis teknologi sensor detak jantung. Kanmuru akan mendeteksi perubahan detak jantung pada pengguna, ketika detak jantung turun di bawah standar maka sensor akan mengkomunikasikannya melalui sistem nodeMCU kemudian meneruskannya ke aktuator vibration motor, buzzer dan/atau penyengat listrik sehingga akan ada getaran, suara nyaring, dan/atau sengatan listrik yang akan memberikan efek kejut kepada pengguna sesuai mode yang dipilih sehingga kantuk akan hilang. Selain itu, wristband ini dapat dihubungkan dengan android untuk memantau nilai BPM yang tercatat setiap waktunya, mengatur batasan BPM ngantuk, dan mengubah mode alat sesuai kebutuhan. Inovasi ini akan membantu mewujudkan SDGS poin ke-8 : Increasing labour productivity.
Dynamic Plastic Deformation Induced by Repetitive Hammering on Cr-Mn Austenitic Stainless Steel Syahwira Taqwa Triadi; Cherly Selindiana; Hermawan Judawisastra; Aditianto Ramelan; Rochim Suratman
Metalurgi Vol 37, No 1 (2022): Metalurgi Vol. 37 No. 1 April 2022
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (764.094 KB) | DOI: 10.14203/metalurgi.v37i1.618

Abstract

Austenitic stainless steels have advantages, such as high ductility and good corrosion resistance. The cold working process can increase the hardness and strength of the material. However, because a metastable austenite phase occurs in that material, there is a phase change of γ austenite to α’-martensite and ε-martensite, which will reduce the ductility and its corrosion resistance. The strengthening process with dynamic plastic deformation (DPD) can prevent the formation of martensitic phases through repeated impact at high strain rates. This study analyzed microstructures and hardness evaluation on Cr-Mn austenitic stainless steel due to dynamic plastic deformation through the repetitive hammering method. Repetitive hammering with a strain rate of 6,2 s-1 on Cr-Mn austenitic stainless steels was carried out on five specimens with variations in the impact of 50, 100, 150, 250, and 350 times with impact energy of 486 J/cm2, 2.207 J/cm2, 2.569 J/cm2, 6.070 J/cm2, and 11.330 J/cm2 respectively. Microstructure, hardness, and XRD (X-ray diffraction) analyses were carried out on specimens before and after repetitive hammering. Metallography was carried out to observe the microstructure using an optical microscope. The hardness was tested through the Rockwell A hardness test. XRD examination was used to identify the phases formed and indications of nano-twins. The repetitive hammering process up to 350 times has succeeded in increasing hardness from 53.5 HRA to 71.6 HRA. Plastic deformation introduced by repetitive hammering produced slip bands, cross bands, wavy bands, and indication of nano-twins formation and increased the hardness. 
Co-Authors A. Rozaq A.S. Nugroho Adhi Satriyatama Adhitya Gandaryus Saputro Ahmad Nuruddin Akhmad Zein Eko Mustofa Aldo, Dian Afif Asep Ridwan Setiawan Azka Zakiyyatuddin Badruzaman Badruzaman Brian Yuliarto Cherly Selindiana Ekavianty Prajatelistia F.N. Sutandi Firmansyah Sasmita Firmansyah Sasmita Hariadi Tri Prasetia Haris Amaldi Haris Wahyudi Hermawan Judawisastra Husen Taufiq IGN Wiratmaja Puja IGN Wiratmaja Puja M. Maulana Ibrahim Muhammad Fathurrohman Nurcahyo Indro Basuki Prasetia, Hariadi Tri R. Rachmantyo Riska Rachmantyo Riska Rachmantyo Rochim Suratman Rochim Suratman Rochim Suratman Rochim Suratman Susana Susana Syahwira Taqwa Triadi T. Indriati Tatacipta Dirgantara, Tatacipta