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All Journal Natural B Jurnal Fisika Unand Jurnal Informatika dan Teknik Elektro Terapan Jurnal Fisika FLUX JPSE (Journal of Physical Science and Engineering) AGREGAT AKSIOLOGIYA : Jurnal Pengabdian Kepada Masyarakat Journal of Physics and Its Applications Indonesian Physical Review Jurnal Fisika dan Terapannya Mitra Mahajana: Jurnal Pengabdian Masyarakat Jurnal El Tarikh: Journal of History, Culture, and Islamic Civilization Progressive Physics Journal Jurnal Ilmu dan Inovasi Fisika Lontar Physics Today InSTEM Frontier Advances in Applied Science and Engineering

Ahmad Zarkasi

Universitas Mulawarman

Author-ID : 2852883

Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Public Health Social Sciences Transportation Other

Published : 28 Documents Claim Missing Document

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2D Imaging Technique Electrical Impedance Distribution on Liquid with Paired Method and Using EIDORS Software Ahmad Zarkasi; Abdurrouf Abdurrouf; Didik Rahadi Santoso
Natural B, Journal of Health and Environmental Sciences Vol 4, No 1 (2017)
Publisher : Natural B, Journal of Health and Environmental Sciences

This paper discusses the 2D imaging technique of the electrical impedance distribution in the liquid by using the principles of Electrical Impedance Tomography (EIT). A tomographic technique used in the imaging process is a adjacent or neighbor method, with input data obtained from measurements of the electrical potential at the boundary measuring object. Measurement data is reconstructed using open source software, i.e. EIDORS, which in image reconstruction using the principle of Finite Element Method (FEM). As a comparison on the results of image reconstruction by EIDORS, here used Boundary Data Simulation (BDS) were obtained from the same measurement data. Based on the results of the 2D images that have been obtained, it is evident that the techniques and imaging methods that have been used are able to show the distribution of electrical impedance value of the measuring object and have a good agreement with the results of BDS.

Desain Alat Identifikasi Tipe Oli Berdasarkan Nilai Intensitas Cahaya Menggunakan Sensor Light Dependent Resistor Berbasis Mikrokontroler Ahmad Zarkasi; Amirin Kusmiran; Erlinda Ratnasari Putri
Jurnal Fisika Unand Vol 10 No 4 (2021)
Publisher : Universitas Andalas

Oli memiliki kompatibilitas yang berbeda-beda pada suatu unit alat berat dan dapat mempengaruhi performa mesin. Oleh karena itu, alat identifikasi tipe oli telah dikembangkan pada penelitian ini dengan menggunakan sensor light dependent resistor (LDR). Oli yang dijadikan objek pengujian bermerek Caltex dengan tipe SAE 10, SAE 30, SAE 40, SAE 60, dan SAE 90 dengan nilai viskositas berturut-turut yakni 6,0 cSt, 11,7 cSt, 13,7 cSt, 14,2 cSt, dan 25,5 cSt. Pengujian dilakukan dengan menempatkan sampel oli di antara sumber cahaya dan sensor LDR. Intensitas cahaya yang diterima oleh sensor sangat dipengaruhi oleh kecerahan warna sampel oli yang digunakan. Nilai analog dari sensor selanjutnya diakuisisi oleh mikrokontroler Arduino Nano untuk diproses lebih lanjut. Hasil pengujian menunjukkan bahwa alat yang dirancang sudah bekerja dengan baik dan mampu mengenali tipe oli dengan tingkat akurasi sebesar 96,7 %.Â

Klasifikasi Kedalaman Kejadian Gempa Menggunakan Algoritma K-Means Clustering: Studi Kasus Kejadian Gempa Di Sulawesi Amirin kusmiran; Minarti; Muhammad Fawzy Ismullah Massinai; Ahmad Zarkasi; A. Andira Maharani; Rita Desiani
JFT : Jurnal Fisika dan Terapannya Vol 9 No 2 (2022): DESEMBER
Publisher : Universitas Islam Negeri Alauddin Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/jft.v9i2.29198

Sulawesi region is one of the region that have complex geologic conditions so that disasters caused by large scale earthquake frequently occur in these region. Depth and magnitude attribute of the earthquake that cause the disasters are investigation using machine learning technique. Longitude, latitude, magnitude, depth attributes are used to depth cluster of the earthquake events in 1970-2022 period. The cluster number have been optimized by Elbow method, and validated by Davies-Bouldin index (DBI). The result is shown that the three cluster is the best cluster than the others, and its Davies-Boludin index is 0.397. Depth of the fist cluster is less than equal to 120 km (shallow earthquake), the second cluster is among 120 km and 350 km (intermediate earthquake), and the third cluster is greater than 350 km (deep earthquake). The cluster visualizations of the earthquakes are revealed that shallow earthquakes with above 5 SR are frequently occurred in shallow depth. Based on results, Sulawesi Region is vulnerable to earthquake hazard, and K-Mean clustering algorithm is successfully to cluster of earthquake depth.

Rancang Bangun Prototipe Monitoring Suhu dan Kelembaban Udara Berbasis Internet Of Things (IOT) Pada Laboratorium Kalibrasi Balai Pengujian dan Sertifikasi Mutu Barang Samarinda Muhammad Awaluddin; Syahrir Syahrir; Ahmad Zarkasi; Erlinda Ratnasari Putri
Progressive Physics Journal Vol 3 No 1 (2022): Progressive Physics Journal
Publisher : Program Studi Fisika, Jurusan Fisika, FMIPA, Universitas Mulawarman

Telah dilakukan penelitian tentang rancang bangun prototipe monitoring suhu dan kelembaban udara berbasis internet of things (IoT) pada Labratorium Kalibrasi Balai Pengujian dan Sertifikasi Mutu Barang (BPSMB) Samarinda. Penelitian ini bertujuan merancang prototipe yang dapat mengukur suhu dan kelembaban udara menggunakan sensor BME280 berbasis mikrokontoler NodeMCU ESP8266. Tahapan penelitian dilakukan dengan merancang perangkat keras dan perangkat lunak prototipe menggunakan BME280 sebagai sensor yang dapat mengukur suhu dan kelembaban udara dan NodeMCU ESP8266 sebagai kontrol utama yang dilakukan di Laboratorium Elektronika dan Instrumentasi Universitas Mulawarman. Tahap selanjutnya, dilakukan pemantauan suhu dan kelembaban udara di Laboratorium Kaibrasi Balai Pengujian dan Sertifikasi Mutu Barang Samarinda. Hasil perancangan prototipe dapat mengukur suhu dan kelembaban udara seacara realtime serta dapat dimonitoring menggunakan smartphone melalui aplikasi blynk dan hasil monitoring di Laboratorium Kalibrasi BPSMB Samarinda menunjukkan bahwa laboratorium tersebut berada pada suhu ideal yaitu 18 - 22 sesuai standar acuan JIS Z 8710 (Japanese Industrial Standard).

Karakteristik Adsorben Ampas Teh dalam Menyerap Ion Logam Timbal Menggunakan Model Isoterm Langmuir Akbar Perdana; Ahmad Zarkasi, Dadan Hamdani; Adrianus Inu Natalisanto Natalisanto, Rahmawati Munir
JIIF (Jurnal Ilmu dan Inovasi Fisika) Vol 7, No 1 (2023)
Publisher : Universitas Padjadjaran

Timbal merupakan salah satu logam berat pencemar air yang sangat berbahaya. Salah satu metode yang dapat digunakan untuk menghilangkan kandungan logam berat tersebut adalah adsorpsi. Dalam proses adsorpsi, pemilihan adsorben sangat penting untuk memaksimalkan proses adsorpsi. Karenanya, penting untuk mengetahui karakteristik dan performa adsorben dalam menyerap logam berat. Model isoterm dapat digunakan untuk memprediksi karakteristik dan performa dari suatu adsorben. Penelitian ini dilakukan untuk meninjau karakteristik dan performa adsorben ampas teh dalam menyerap ion timbal menggunakan model isoterm. Hasil dari penelitian menunjukan bahwa mekanisme penyerapan ion timbal oleh ampas teh terjadi secara fisisorpsi, yaitu ikatan ion. Adapun sifat adsorpsi yang terjadi adalah menguntungkan. Ini menunjukan bahwa ketertarikan ion timbal terhadap ampas teh besar. Kapasitas maksimum ampas teh dalam menyerap ion timbal adalah 3,0353 mg/g. Ini menunjukan bahwa satu gram ampas teh dapat menyerap sebesar 3,0353 mg ion timbal.Kata Kunci: Adsorpsi, Ampas Teh, Timbal, Pencemaran Air, Isoterm

Analisis Pergerakan Partikel terhadap Rekaman Mikrotremor di Permukaan Sungai Bawah Tanah Bribin, Kawasan Karst Gunung Sewu Kholis Nurhanafi; Ahmad Zarkasi; Sahara Hamas Intifadhah; Nugroho Budi Wibowo; Aditya Yoga Purnama
Jurnal Fisika Unand Vol 12 No 3 (2023)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.12.3.471-478.2023

Microtremor has been widely used to determine soil characteristics and dynamics. In this research, particle motion analysis was conducted on 15 microtremor data recordings around the surface of the Bribin Underground River in the Gunungsewu Karst Area. Spectrum analysis was conducted as a basis for determining the frequency range for the particle motion analysis process. Particle motion analysis was only carried out on the horizontal component of the microtremor signal which is expected to provide a representation of the river flow path. The results of particle motion analysis of microtremor recordings in the surface area of the Bribin Underground River show that there are only two points that have a motion-resultant oriented to certain direction, which is perpendicular to the river channel.The points are A4 and B4 which are located in the eastern part of the river flow path.

Upaya Peningkatan Minat Belajar Sains Fisika di SDN 022 Samarinda Utara Melalui Pelatihan Pengukuran Dasar Rahmawati Munir; Mislan Mislan; Ahmad Zarkasi; Erlinda Ratnasari Putri; Wahidah Wahidah; Idris Mandang
Aksiologiya: Jurnal Pengabdian Kepada Masyarakat Vol 7 No 4 (2023): November
Publisher : Universitas Muhammadiyah Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30651/aks.v7i4.11119

Upaya peningkatkan minat siswa terhadap sains fisika harus dari usia karena selama ini bidang fisika masih dianggap pelajaran yang sulit . Tujuan pengabdian masyarakat ini adalah melaksanakan pembelajaran pengukuran dasar di SDN 022 Samarinda Utara. Khalayak sasaran merupakan siswa kelas 4-6 berjumlah 25 orang yang dipilih secara acak. Alat ukur dasar yang digunakan adalah mistar, jangka sorong, mikrometer, gelas ukur dan bahan-bahan yaitu kertas, batu, pasir, telur dan gelas. Tahapan pelaksanaan kegiatan penjelasan nama dan fungsi alat ukur, contoh penggunaan alat ukur dan praktek oleh siswa. Pemantauan dan dievaluasi dilakukan terhadap: pengalaman dan pemahaman alat ukur, ketrampilan penggunaan alat, apakah kegiatan menarik bagi peserta, saran/masukan kegiatan praktek di sekolah dan saran/masukan untuk kampus. Hasil menunjukkan, dari seluruh alat ukur yang familiar adalah mistar, sedangkan yang lain sebatas tahu dari gambar dan tidak pernah mempraktekan. Sebaiknya kegiatan praktikum di sekolah dapat dilaksanakan secara rutin dan berhubungan dengan kehidupan sehari-hari, dan untuk mendukung hal tersebut sekolah dan Universitas Mulawarman berkolaborasi secara berkelanjutan dalam bentuk kesepakatan sekolah mitra.

APLIKASI SENSOR MICRO ELECTRO MECHANICAL SYSTEM (MEMS) ACCELEROMETER BERBASIS IOT DALAM PENGUKURAN PERCEPATAN MAKSIMUM GETARAN STRUKTUR JEMBATAN Rafika Ade Rahayu; Kholis Nurhanafi; Syahrir Syahrir; Ahmad Zarkasi
Jurnal Informatika dan Teknik Elektro Terapan Vol 12, No 2 (2024)
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jitet.v12i2.4134

Alat ukur getaran dengan sensor Micro Electro Mechanical System (MEMS) berbasis Internet of Things (IoT) merupakan alat yang dapat diaplikasikan pada pengukuran nilai percepatan maksimum getaran struktur jembatan. Tujuan penelitian ini adalah untuk merancang alat ukur getaran dengan sensor MEMS berbasis IoT dengan harga yang relatif rendah dan mengukur standar deviasi pada alat ukur tersebut. Pada penelitian ini alat ukur dibuat dengan sensor MEMS tipe ADXL345 yang dihubungkan dengan mikrokontroler NodeMCU Esp8266 lalu diprogram pada interface Arduino IDE agar dapat terhubung dengan platform IoT Blynk. Sistem alat ukur yang dirancang dapat merekam data pada Cloud Blynk dengan nilai sampling 1 Hz. Nilai standard deviasi pada 3 titik pengukuran jembatan tiap sumbunya yaitu: pada titik 1 dengan sumbu x, y, dan z secara berturut-turut sebesar 0.0137 g, 0.0163 g, 0.0228 g; titik 2 sumbu x, y, z secara berturut-turut sebesar 0.0139 g, 0.0195 g, 0.0299 g; titik 3 sumbu x, y, z secara berturut-turut sebesar 0.0139 g, 0.0285 g, 0.0313 g.

Socialization of Making Egg Shell Powder as a Water Purifying Material in Senoni Village, Sebulu District, Kutai Kartanegara Regency Zarkasi, Ahmad; Ratnasari Putri, Erlinda; Nurhanafi, Kholish; Hamdani, Dadan; Perdana, Akbar; Nurohman, Ali; Munir, Rahmawati
Jurnal Inovasi Sains dan Teknologi untuk Masyarakat Vol. 1 No. 2 (2023): November
Publisher : Faculty of Mathematics and Natural Sciences, University of Jember. Jl. Kalimantan No.37, Krajan Timur, Jemberlor, Kec. Sumbersari, Jember Regency, East Java 68121

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/instem.v1i2.463

The production of eggshell powder as a water purifier has the potential to be utilized in Senoni Village, Sebulu District, Kutai Kartanegara Regency, East Kalimantan. Based on the results of initial observations the majority of residents there use Mahakam river water for daily needs where the water is still classified as cloudy. The purpose of implementing Community Service Activities is through socializing the production and utilization of eggshell powder as a water purifier and providing assistance through training activities on the powder as a water purifier. The approach method used were the lecture method, demonstration method, and mentoring method. Furthermore, the stages of socialization implementation as a solution to overcome the problems are as follows: 1) sample preparation stage, 2) socialization preparation stage, 3) implementation stage, and 4) evaluation stage. The results of the activity showed that an increase of 84% of participants knew the procedure for making eggshell flour, and 60% felt that it was very easy to make so it was very possible for participants to make it independently at their respective homes. This activity went well and smoothly without any significant problems. Participants are interested and want to implement the new knowledge that has been obtained through this socialization method, scientific findings results, and a short conclusion. The abstract should only be typed in one paragraph and one-column format.

Spectrum Analysis of Sound Wave Recordings with Dolphinear type DE200 Based on Distance and Frequency Variations in Mahakam River Using Audacity Software Nurhanafi, Kholis; Mislan, Mislan; Zarkasi, Ahmad; Ariyanthi, Gita Putri; Purnama, Aditya Yoga; Saputra, Kormil
JPSE (Journal of Physical Science and Engineering) Vol 8, No 2 (2023): JPSE (Journal of Physical Science and Engineering)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um024v8i22023p111

Dolphinear is an instrument for monitoring sound wave signals underwater. This study aims to see how the results of sound recording by Dolphinear type DE200 based on variations in distance and frequency of the sound source using the Audacity Software. In this study, the sound source will be generated through a waterproof speaker with a frequency variation of 100 Hz to 20 kHz. The distance between the sound source and the dolphinear is also varied from 1 to 5 meters. Audacity software is used to generate, record, and obtain the spectrum of the recorded audio sound signal. Based on the spectrum of the sound recorded by the DE200 dolphinear, frequency peaks close to the source frequency can be detected in recording using a 500 Hz sound source, but the main frequency peaks in the spectrum are difficult to detect in recording using sound sources above 500 Hz. In this study, it was also found that there is a limit to the recording ability of the dolphinear DE200 for frequencies above 18 kHz which is indicated by a decrease in intensity at that frequency.

Co-Authors -, Syahrir A. Andira Maharani abdurrouf Abdurrouf Ade Fitriani, Ade Aditya Yoga Purnama Adrianus Inu Natalisanto Adryan Fitrayudha Akbar Perdana Akbar Perdana Alris Sanca Pratama Putra Amirin Kusmiran Andi Syam Rizal Anwar Efendy Ariyanthi, Gita Putri Aulia Muttaqin Dadan Hamdani Dadan Hamdani, Dadan Didik Rahadi Santoso Erlinda Ratnasari Putri Hananda Putra, Muhammad Fauzan Hasan, Aly Hemelia, Junita Hidayatullah, Muhammad Idris Mandang Idris Mandang, Idris Intifadhah, Sahara Hamas Isfanari Jerri, Alyadris Kasturi Ramadani Kholis Nurhanafi Kormil Saputra Leo Anugerah Putra Maolida Uci Handayani Minarti Minarti Mislan Mislan Mislan Mohammad Asrul Muhammad Awaluddin Muhammad Fawzy Ismullah Massinai Munir, Rahmawati Nugroho Budi Wibowo Nugroho Budi Wibowo Nur Hanafi, Kholis Nuraidha, Amalia C Nurohman, Ali Perdana, Akbar Pradana, Andre Juliko Putri, Devina Rayzi Perwitasari Sutaji Putri, Devina Rayzy Perwitasari Sutaji Rafika Ade Rahayu Rahayu, Rafika Ade Rita Desiani Sahara Shonhaji Supriyanto Supriyanto Syahrir Syahrir Syahrir Syahrir Syahrir Syahrir Ummah, Auliya Rahmatul Wahidah Wahidah Wahidah Wahidah Wardani, Pratiwi Sri Wulandari, Darmawati

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