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Dahyunir Dahlan
Departemen Fisika Fakultas Matematika Dan Ilmu Pengetahuan Alam Universitas Andalas
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Elektodeposisi Lapisan Tembaga pada Baja SS-304 dengan Larutan Elektrolit Mengandung Ekstrak Daun Binahong sebagai Inhibitor Korosi Oktavia, Niken; Dahlan, Dahyunir
Jurnal Fisika Unand Vol 13 No 3 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.3.413-419.2024

Abstract

Penelitian tentang pengaruh esktrak daun binahong sebagai inhibitor korosi baja SS-304 telah dilakukan. Pada penelitian ini, lapisan tembaga dan inhibitor ekstrak daun binahong dilapisi pada permukaan baja menggunakan metode elektrodeposisi. Pelapisan baja dibagi dalam tiga kelompok berdasarkan lama elektrodeposisi yaitu 10 menit, 20 menit, dan 30 menit. Media korosif dibuat dengan melarutkan 14,2 g Na2SO4 ke dalam 100 mL aquades. Pengujian laju korosi sampel dilakukan selama 21 hari pada suhu ruang. Pengukuran laju korosi dilakukan dengan metode weight loss, sementara efisiensi inhibisi diperoleh dari selisih laju korosi tanpa inhibitor dan dengan inhibitor. Laju korosi yang paling rendah didapatkan pada penambahan konsentrasi inhibitor 3% dan lama elektrodeposisi 30 menit yaitu sebesar 0,291 mils per year (mpy) dan efisiensi inhibisi tertinggi diperoleh sebesar 89,20%. Karakterisasi untuk mengamati permukaan baja setelah elektrodeposisi dan perendaman dilakukan menggunakan mikroskop optik dan menganalisis fasa yang terbentuk menggunakan X-Ray Diffraction (XRD). Semakin lama elektrodeposisi sampel maka inhibitor teradsorpsi lebih baik dan nilai laju korosi semakin kecil.
SOSIALISASI DAN PEMETAAN POTENSI TANAH LONGSOR MENGGUNAKAN METODE MIKROSEISMIK DAN GEOLISTRIK DI KAWASAN OBJEK WISATA BUKIT NOBITA Marzuki Marzuki; Mutya Vonnisa; Ahmad Fauzi Pohan; Arif Budiman; Imam Taufiq; Trengginas Eka Putra Sutantyo; Elistia Liza Namigo; Dian Milvita; Alimin Mahyudin; Nini Firmawati; Muldarisnur Muldarisnur; Afdal Afdal; Dahyunir Dahlan; M. Ali Shafii; Afdhal Muttaqin; Rico Adrial; Dedi Mardiansyah; Harmadi Harmadi; Zulfi Zulfi; Geby Sri Ayu Oktavia; Fani Anjelina; Nurul Annisa
Jurnal Hilirisasi IPTEKS Vol. 6 No. 2 (2023)
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jhi.v6i2.655

Abstract

Nobita Hill is one of the areas being developed as a tourist attraction in the city of Padang. Above Nobita Hill is a beautiful view, and you can see the picture of Padang City. However, the hilly topography with steep slopes makes this area prone to landslides. This activity aims to map the potential for landslides on Novita Hill. Activities start from preparation, implementation in the field, and evaluation. Field activities are carried out in two stages. The first stage is an experiment to map the landslide potential. The second stage is socialization. The target audience for this activity is the Village Head of Jua Nan XX Village and its officials and the community around Nobita Hill. The results of the study and mapping were disseminated to the village administration and community leaders involved in the development of the Bukit Nobita tourism area, which was carried out on November 16, 2022. The result of tourist objects often changes land use and cover. However, mitigation of the potential for landslides in this area has never been done. Therefore, the Andalas University Physics Department team mapped the potential for landslides on Novita Hill for six months, using microseismic and geoelectric methods. This activity obtained a map of the distribution of dominant frequencies, a map of the distribution of amplification, and an identification of slip planes concerning the potential for landslides on Nobita Hill. Furthermore, the results of the mapping and mitigation efforts have been disseminated to the village administration and community leaders involved in the development of the Bukit Nobita tourism area. This activity was carried out well. The landslide potential distribution map obtained from this activity is input for the community and stakeholders in developing the Buki Nobita tourist attraction that is safe from disasters.
Rancang Bangun Sensor Kelembaban Udara menggunakan Plastic Optical Fiber (POF) dengan Cladding TiO2-SiO2 dan Data Transmisi: Febrielviyanti, Harmadi, Dahyunir Dahlan, Yetria Rilda Febrielviyanti Febrielviyanti; Harmadi Harmadi; Dahyunir Dahlan Dahyunir Dahlan; Yetria Rilda Yetria Rilda
Jurnal Fisika dan Aplikasinya Vol 15 No 1 (2019): January 2019 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v15i1.4358

Abstract

The optical fiber is a transmission medium in the form of a cable made of glass or plastic used to transmit light signals from one point to another. The working principle of optical fibers utilizes the principle of perfect reflection by utilizing the refractive index difference between the core and cladding. The optical fiber can be used as a sensor by using an instrumentation system consisting of input, process, and output. Input or input uses a diode laser, where the spectrum is very narrow so it is suitable to be used as a source. The data transmission process uses optical fiber as a waveguide. Data recording transmits humidity using Arduino Uno and Ethernet Shield. The output is in the form of output voltage displayed on the LCD or PC. The best stripping length is 2 cm with TiO2-SiO2 coating as a substitute for cladding, which shows the value of R2 = 0.982. The average error obtained from the design of air humidity devices was 3.06%. This shows the incompatibility between reading a tool designed with a standard measuring instrument because the sensor designed is still very vulnerable to systematic errors.
Peningkatan Ketahanan Baja SS-304 terhadap Korosi Menggunakan Lapisan Tembaga dan Inhibitor dari Tanin Ekstrak Daun Sirsak dengan Metode Elektrodeposisi Letmi Syara; Dahlan, Dahyunir
Jurnal Fisika Unand ##issue.vol## 15 ##issue.no## 3 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Research has been conducted on improving the corrosion resistance of SS-304 stainless steel using copper coating and an inhibitor derived from soursop leaf extract via the electrodeposition method. The main objective of the research was to determine the optimal concentration of soursop leaf extract as an inhibitor for protecting the steel from the corrosion. The inhibitor concentrations used were 0%; 1%; 2%; 3%; 4% and 5%. Layer characterization was performed using an optical microscope to observe the surface of the electrodeposited coating, while X-ray diffraction (XRD) was used to identify the phase and crystal structure of the formed protective layer. The corrosion rate was calculated based on mass change after immersion in a corrosive medium. The result showed that the most optimal corrosion inhibition was achieved at an inhibitor concentration of 4%, with an inhibition efficiency of 94%. At this concentration, the lowest corrosion rate was recorded, and the surface morphology appeared the smoothest compared to the other prepared samples. Crystal phase analysis revealed that before immersion, the protective layer consisted of the copper (Cu) phase, whereas after immersion, a new phase was formed, namely copper oxide (CuO).
Co-Authors A. Fadhil Desafa A.A. Ketut Agung Cahyawan W Abdil Bajili Ade Usra Berli Adrial, Rico Afdal Afdal Afdal, Afdal Afdhal Muttaqin Afdhal Muttaqin Afifah Zahra Hakimin Agus Rozani Ahmad Fauzi Pohan Aini, Tantri Marelita Akrajas Ali Umar Akrajas Ali Umar Akrajas Ali Umar Alimin Mahyudin Andhika Dwipanur Anggi Pravita R Anggi Pravita R Anggia Arista Anla Fet Hardi Apriska Prameswari Apriska Prameswari Ardi Riski Saputra Arif Budiman Arista, Anggia Arsis, Asi Noflanda Asi Noflanda Arsis Astuti Astuti Astuti Aulia Rabiyu Rizky Bajili, Abdil Debby Herianto Wijaya Debby Herianto Wijaya, Debby Herianto Dedi Mardiansyah Dian Fitriyani Dian Fitriyani Dian Milvita Disgie Ulfika Loveanda Dwi Pujiastuti Dwi Pujiastuti Dwi Puryanti Dwipanur P.U, Andhika Dwipanur, Andhika Elistia Liza Namigo, Elistia Elsa Agustina Elsa Agustina Elvaswer Elvaswer Elvaswer F Febrielviyanti Fani Anjelina Fani Anjelina Febrielviyanti Febrielviyanti Feriska Handayani Feriska Handayani Irka, Feriska Handayani Fiqi Diyona Fiqrian, Khudbatul Fitria, Renny Geby Sri Ayu Oktavia Geby Sri Ayu Oktavia Genta El Haqqi Yozu Hakimin, Afifah Zahra Haldis Alvaro Hardi, Anla Fet Harmadi Harmadi Hawariyi Ola Yuzria Hawariyi Ola Yuzria Helga Dwi Fahyuan Helga Dwi Fahyuan Helga Dwi Fahyuan Hermansyah Aziz Imam Taufik Imam Taufiq Imam Taufiq Imam Taufiq Imelda Imelda Jijim Fadilla Warman Karim, Afdal Khudbatul Fiqrian Leng, Tjiauw Siaw Letmi Syara Loveanda, Disgie Ulfika Lubis, Muhammad Frassetia M. Ali Shafii M. Ali Shafii M. Fajmi Zulkaham Manda, Poni Dwi Marzuki Marzuki Marzuki Marzuki Meqorry Yusfi Mohammad Ali Shafii Mora Mora Mora Mora Mora Moresa Devega Moresa Devega, Moresa Muchlian, Meli Muhammad Frassetia Lubis Muhammad Shadri Muharmen Suari Muldarisnur, Mulda Mutya Vonnisa Niken Oktavia Nini Firmawati Nurfaisal Anuar Nurul Annisa Nurul Annisa Nurwijayanti Oktavia, Niken Oktaviani Zairawati Olly Norita Tetra Prameswari, Apriska Rahmad Rasyid Rahmad Rasyid Rahmat Rasyid Ramacos Fardela Ramadhani Perdana Ramadhani Perdana, Ramadhani Rani Delvihardini Renny Fitria Rhahmi Adni Pesma Rizky, Aulia Rabiyu Roni Syafrialdi Roni Syafrialdi, Roni Sadiqin, Siti Naqiyah Shadri, Muhammad Silva Azaria Mahaputri Siti Chadijah Sri Handani Sri Mulyadi Sri Mulyadi Sri Oktamuliani Suari, Muharmen Sylvina Tebriani Syukri - Syukri Syukri Tantri Marelita Aini Tjiauw Siaw Leng Trengginas Eka Putra Trengginas Eka Putra Sutantyo Warman, Jijim Fadilla Wildian Wildian Wildian Wildian Yetria Rilda Yozu, Genta El Haqqi Yuli Yetri Yuli Yetri Yusfi, Meqqory Zairawati, Oktaviani Zaki, Shakahuddin Zozy Aneloi Noli Zulfi Zulfi Zulfi Zulfi Zulfi Zulfi Zulfi Zulfi Zulfi, Zulfi Zulkaham, M. Fajmi