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All Journal Jurnal Sains Materi Indonesia Jurnal Fisika Unand SEMIRATA 2015 JFA (Jurnal Fisika dan Aplikasinya) JURNAL INTEGRASI Jurnal Hilirisasi IPTEKS (JHI) Jurnal Ilmu Fisika MONSU'ANI TANO Jurnal Pengabdian Masyarakat BERNAS: Jurnal Pengabdian Kepada Masyarakat

Dahyunir Dahlan

Jurusan Fisika FMIPA Universitas Andalas

Author-ID : 447525

Religion Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Dentistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Neuroscience Nursing Physics Public Health Social Sciences Veterinary Other

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SINTESA LAPISAN NIKEL (Ni) PADA PERMUKAAN BAJA DENGAN METODE ELEKTRODEPOSISI DENGAN PENAMBAHAN INHIBITOR EKSTRAK KULIT BUAH KAKAO (THEOBROMA CACAO) Yuli Yetri; Silva Azaria Mahaputri; Dahyunir Dahlan
JURNAL INTEGRASI Vol 11 No 2 (2019): Jurnal Integrasi - Oktober 2019
Publisher : Politeknik Negeri Batam

Telah dilakukan proses elektrodeposisi lapisan Ni diatas subtrat baja dengan menggunakan larutan 0,5 M NiSO4.6H2O, H3BO3 dengan penambahan inhibitor ekstrak kulit buah kakao. Pada penelitian ini dilakukan variasi tegangan elektrodeposisi 1, 2, 3 dan 4 V. Sementara variasi konsentrasi inhibitor ekstrak kulit buah kakao dilakukan dengan variasi konsentrasi 1 % dan 2 %. Waktu elektrodeposisi dilakukan selama 25 menit untuk setiap sampelnya. Terdapat perbedaan morfologi pada baja sebelum dan setelah dielektrodeposisi. Peningkatan tegangan maka hasil dari deposisi terlihat semakin tebal. Dengan melakukan variasi konsentrasi dan variasi tegangan elektrodeposisi, didapatkan konsentrasi yang baik yaitu dengan konsentrasi 1% dengan tegangan 3 Volt. Penambahan inhibitor ekstrak kulit buah kakao membuat morfologi permukaan baja menjadi lebih halus dan lebih merata.

Pengelolaan Laboratorium Bagi Guru-Guru Fisika dan Perancangan Laboratorium Percontohan di SMAN 2 Harau Dedi Mardiansyah; Afdhal Muttaqin; Ramacos Fardela; Feriska Handayani Irka; Astuti; Sri Handani; Harmadi; Dahyunir Dahlan; Zulfi; Rahmad Rasyid; Marzuki; Mohammad Ali Shafii; Arif Budiman; Elvaswer; Mora; Wildian
BERNAS: Jurnal Pengabdian Kepada Masyarakat Vol. 4 No. 1 (2023)
Publisher : Universitas Majalengka

Laboratorium merupakan salah satu sarana dan prasarana pembelajaran fisika di sekolah untuk menarik pembelajaran dan mendorong motivasi siswa dalam belajar fisika. Kegiatan yang dilaksanakan di laboratorium biasanya dalam bentuk praktikum atau demonstrasi. Laboratorium harus dikelola dan direncanakan dengan baik agar fungsinya optimal sebagai sarana pembelajaran fisika. Hasil observasi di beberapa SMA yang ada di Kabupaten Lima Puluh Kota ditemukan permasalahan bahwa laboratorium tidak dikelola dengan baik sehingga keberadaanya tidak efektif. Siswa jarang diajak praktikum di laboratorium. Alat-alat praktikum yang sudah diperoleh dari Dinas Pendidikan jarang digunakan untuk kegiatan praktikum, sehingga banyak alat yang sudah rusak karena jarang dipakai. Penataan alat dan fasilitas di laboratorium cukup memprihatinkan, tidak tertata dengan rapi dan tidak di inventaris dengan baik. Guru fisika kesulitan dalam mengadakan praktikum karena tidak adanya modul praktikum/buku petunjuk praktikum. Oleh karena itu kegiatan praktikum yang biasanya dilaksanakan di laboratorium kini dilaksanakan di ruang kelas dengan peralatan yang seadanya. Ini menyebabkan keberadaan laboratorium fisika tidak dimanfaatkan dengan baik. Atas dasar permasalahan-permasalahan tersebut, maka kami tim Pengabdian Kepada Masyarakat mengadakan pembinaan pengelolaan laboratorium fisika bagi guru-guru MGMP fisika yang ada di Kabupaten Lima Puluh Kota agar para guru fisika mampu mengelola laboratorium dengan baik sehingga dapat digunakan untuk kegiatan praktikum maupun proses pembelajaran. Rencana kegiatan PKM antara lain 1) Memberikan sosialisasi pengelolaan laboratorium, 2) Melakukan pengembangan Laboratorium Percontohan Implementasi Merdeka Belajar, 3) Melakukan diskusi pembuatan alat-alat praktikum dari peralatan sederhana, 4) Melakukan diskusi pembuatan modul praktikum/ buku petunjuk praktikum, dan 5) Melakukan monitoring awal dan lanjutan terhadap laboratorium dibeberapa sekolah yang berada di Kebupaten Lima Puluh Kota.

Penghambatan Korosi Melalui Adsorpsi Ekstrak Kulit Kakao (Theobroma cacao) pada Permukaan Baja: Metode Eksperimen dan DFT Apriska Prameswari; Dahyunir Dahlan; Yuli Yetri; Imelda
Jurnal Ilmu Fisika Vol 15 No 1 (2023): March 2023
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.15.1.56-65.2023

Steel surface coating has been carried out using the immersion method in an inhibitor of cacao (Theobroma cacao) peel extract for 24, 72, 120, and 168 hours. The corrosion treatment was performed using HCl with different immersion time of 48, 96, and 144 hours after coating process with the inhibitor. Corrosion testing with the weight loss method gave the best results with the lowest corrosion rate of 0.2972 mg.cm2/hour and inhibition efficiency of 74.7128% for steel samples with the longest immersion time in inhibitor. Optical microscopy and SEM images indicated that the longer the immersion time in the inhibitor, the better (i.e., fewer holes and cracks) the surface morphology of the steel. The appearance of four sharp peaks in the XRD diffractogram indicated that the samples with the lowest corrosion rate produced Fe and C crystalline phases due to the reaction between the steel surface and the inhibitor. A quantum chemical analysis using the DFT (Density Functional Theory) method also produced a fairly high inhibition efficiency and was close to the experimental results of 80.2098%.

Ekstrak Daun Jambu Bol (Syzygium Malaccense) sebagai Inhibitor Korosi pada Kawat Ortodontik M. Fajmi Zulkaham; Dahyunir Dahlan
Jurnal Fisika Unand Vol 12, No 2 (2023)
Publisher : Universitas Andalas

Telah dilakukan pengujian inhibitor dari ekstrak daun jambu bol untuk menghambat laju korosi pada kawat ortodontik stainless steel. Penelitian dilakukan dengan merendam kawat menggunakan inhibitor yang bertujuan untuk mendapatkan lapisan pelindung pada permukaan kawat. Pengujian sampel dibagi dalam tiga kelompok berdasarkan lama perendaman dengan inhibitor yaitu 18 jam, 24 jam, dan 48 jam. Setiap kelompok diberi variasi konsentrasi ekstrak daun jambu bol yaitu 0 g/L, 2 g/L, 4 g/L, 6 g/L, 8 g/L, dan 10 g/L untuk direndam dengan kawat ortodontik stainless steel. Media korosif berupa air liur buatan atau saliva buatan yang dibuat menggunakan komposisi saliva dari Fusayama Meyer. Pengukuran laju korosi dilakukan menggunakan metode weight loss yang juga menghasilkan nilai efisiensi inhibisi. Nilai laju korosi dan efisiensi inhibisi maksimal adalah pada sampel dengan konsentrasi 10 g/L dan lama perendaman 48 jam yaitu sebesar 1,19 mils per year (mpy), dan efisiensi inhibisinya sebesar 91,71%. Morfologi untuk mengamati permukaan menggunakan mikroskop optik dan menentukan fasa yang terbentuk menggunakan X-Ray Diffraction (XRD). Semakin lama perendaman sampel dengan inhibitor, maka inhibitor teradsorpsi lebih baik dan nilai laju korosi semakin kecil. Konsentrasi yang semakin meningkat akan menghasilkan laju korosi yang semakin kecil jika konsentrasi inhibitor yang diberikan tepat.

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

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.

PENGAYAAN MATERI FISIKA : INDUKSI ELEKTROMAGNETIK DI SEKOLAH MENENGAH ATAS Ramacos Fardela; Zulfi Zulfi; Afdhal Muttaqin; Marzuki Marzuki; Dedi Mardiansyah; Mora Mora; Muldarisnur Muldarisnur; Harmadi Harmadi; Rahmad Rasyid; Dahyunir Dahlan; Elvaswer Elvaswer; Imam Taufiq; Wildian Wildian; Trengginas Eka Putra Sutantyo; Feriska Handayani Irka; Dwi Puryanti; Rani Delvihardini
MONSU'ANI TANO Jurnal Pengabdian Masyarakat Vol 6, No 2 (2023)
Publisher : Universitas Muhammadiyah Luwuk

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32529/tano.v6i2.2992

The concept of electromagnetic induction is very important in understanding and developing modern electrical technology. Some factors cause students to often find it difficult to understand electromagnetic induction material in school is that this material involves abstract concepts such as magnetic flux, magnetic field changes, and emf. For some students, understanding these concepts may be difficult due to a lack of direct experience or concrete representations. Enrichment of physics material on electromagnetic induction has been implemented at SMA N 1 Gunung Talang. This service activity aims to improve students' understanding of the basic concepts of Electromagnetic Induction in Class XII. This service consists of three stages including: preparation, implementation and evaluation. The evaluation of this activity was carried out by comparing the pre-test results before enrichment and the post-test scores of students after being given enrichment material by the lecturer (service team). The results obtained show an increase in student knowledge towards understanding the concept of electromagnetic induction. This service activity can be an effort for school and university cooperation to support student success in understanding physics concepts that are considered complicated

Ekstrak Daun Matoa (Pometia pinnata) sebagai Inhibitor Korosi Baja Karbon SS-304 Renny Fitria; Dahyunir Dahlan; Syukri Syukri
Jurnal Fisika Unand Vol 13, No 1 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.1.49-53.2024

Research has been carried out on inhibitors from matoa leaf extract to inhibit the corrosion rate of SS-304 carbon steel. The Matao leaf extract used as an inhibitor was immersed in a 1 M H2SO4 corrosive medium. To determine the effect of inhibitor concentration and immersion temperature on steel corrosion, various inhibitor concentrations were varied, namely 0%, 1%, 2%, and 3% bt, and temperature variations, namely samples also in XRD and SEM characterization. 35°C and 40°C. The corrosion rate test was carried out using the weight loss method. The increase in the corrosion rate is in line with the increase in sample weight loss. The most efficient inhibitor of matoa leaf extract was obtained at a concentration of 3% with an immersion temperature of 35°C, namely 0.09 mmpy. The XRD results showed that the maximum peaks produced FeC and FeNi crystals, followed by FeO crystals. SEM characterization also showed that samples without inhibitors were more corroded, and samples using 3% inhibitor concentrations were slightly corroded.

Co-Authors A.A. Ketut Agung Cahyawan W Abdil Bajili Ade Usra Berli Afdal Afdal Afdhal Muttaqin Afifah Zahra Hakimin Agus Rozani Ahmad Fauzi Pohan Akrajas Ali Umar Akrajas Ali Umar Akrajas Ali Umar Alimin Mahyudin Andhika Dwipanur Anggi Pravita R Anggia Arista Anla Fet Hardi Apriska Prameswari Apriska Prameswari Ardi Riski Saputra Arif Budiman Arif Budiman Arista, Anggia Arsis, Asi Noflanda Asi Noflanda Arsis Astuti Astuti - Astuti Astuti Aulia Rabiyu Rizky Bajili, Abdil Debby Herianto Wijaya Dedi Mardiansyah Dian Milvita Disgie Ulfika Loveanda Dwi Puryanti Dwipanur P.U, Andhika Dwipanur, Andhika Elistia Liza Namigo Elsa Agustina Elvaswer Elvaswer F Febrielviyanti Fani Anjelina Feriska Handayani Irka, Feriska Handayani Geby Sri Ayu Oktavia Genta El Haqqi Yozu Harmadi Harmadi Harmadi Harmadi Hawariyi Ola Yuzria Hawariyi Ola Yuzria Helga Dwi Fahyuan Helga Dwi Fahyuan Helga Dwi Fahyuan Hermansyah Aziz Imam Taufiq Imam Taufiq Imelda Jijim Fadilla Warman Khudbatul Fiqrian Leng, Tjiauw Siaw M. Ali Shafii M. Fajmi Zulkaham Marzuki Marzuki Marzuki Marzuki Mohammad Ali Shafii Mora Mora Mora Moresa Devega Muchlian, Meli Muhammad Frassetia Lubis Muhammad Shadri Muharmen Suari Muldarisnur, Mulda Mutya Vonnisa Nini Firmawati Nurfaisal Anuar Nurul Annisa Oktaviani Zairawati Rahmad Rasyid Rahmad Rasyid Ramacos Fardela Ramadhani Perdana Ramadhani Perdana, Ramadhani Rani Delvihardini Renny Fitria Rhahmi Adni Pesma Rhahmi Adni Pesma Rico Adrial Rizky, Aulia Rabiyu Roni Syafrialdi Roni Syafrialdi, Roni Shadri, Muhammad Silva Azaria Mahaputri Siti Chadijah Sri Handani Sri Mulyadi Sri Mulyadi Suari, Muharmen Sylvina Tebriani Syukri Syukri Syukri Syukri Tantri Marelita Aini Tjiauw Siaw Leng Trengginas Eka Putra Sutantyo Wildian Wildian Wildian Wildian Yetria Rilda Yuli Yetri Yuli Yetri Zulfi Zulfi Zulfi Zulfi Zulfi

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