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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
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

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Analisis Perubahan Sinyal Pneumatic to Electric Menggunakan Algoritma Fuzzy Logic Jerri, Alyadris; Natalisanto, Adrianus Inu; Zarkasi, Ahmad; Nurhanafi, Kholis; Syahrir, Syahrir
Progressive Physics Journal Vol 4 No 1 (2023): Progressive Physics Journal
Publisher : Program Studi Fisika, Jurusan Fisika, FMIPA, Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ppj.v4i1.1029

Abstract

Control valve is a tool in the oil and gas industry that works by relying on actuators as a driving force. For example, pneumatic actuators work with air pressure as driving energy, and standard signals are used for pneumatic. The signal is converted into a current signal using fuzzy as an application of artificial intelligence systems in the industrial sector. The method used in this study is the utilization of fuzzy logic with the Mamdani method using the software MATLAB. The results will be compared with data from companies and P/I simulation data. Pressure pneumatic algorithm system fuzzy by paying attention to the range of signals used. Company data and P/I converter simulation data are not much different, but the line equation obtained is slightly different. Meanwhile, the fuzzy logic data has slightly different data from the previous data caused by the rules of the fuzzy. Thus, the use of fuzzy logic pressure pneumatic signals to flow signals can be said to be quite capable of being used in these systems by paying attention to the range of signals and rules needed. The comparison results that have been tested have data results that are not much different based on the difference in the value of the current signal and the error value obtained below 2.5%.
Rancang Bangun Prototype Antena Yagi 1,8 Ghz Sebagai Penguat Sinyal Handphone Menggunakan Kayu Ulin Pradana, Andre Juliko; -, Syahrir; Zarkasi, Ahmad
Progressive Physics Journal Vol 4 No 2 (2023): Progressive Physics Journal
Publisher : Program Studi Fisika, Jurusan Fisika, FMIPA, Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ppj.v4i2.1030

Abstract

This study was done to develop a Yagi antenna for a 1.8 GHz mobile phone using ironwood as a signal booster as an alternative for some local communities. Designing a Yagi antenna for this study's initial phase, which took place at FMIPA Mulawarman University's Electronics and Instrumentation Laboratory, involved considering its size and range. The boom length is 1 m, the driven length is 7.9 cm, the reflector length is 8.4 cm, and the director length is 7.5 cm after calculating the length and distance of the Yagi antenna parts. The distances between the elements are as follows: 4.1 cm separates the reflector from the driven, 2.5 cm separates the driven from director 1, 3.3 cm separates director 1 from director 2, and 4.1 cm separates directors 3 through 9 from each other. The download signal (receiver) and upload signal were the characteristics used in data collection on Batu Besaung, Samarinda, and East Kalimantan (transceiver). During the course of this data collection, ten maximum data collection points were taken in each of the compass' eight directions. In the final step, data processing is done to find out how much gain the designed Yagi antenna produces. The highest rates recorded are 2,27 Mbps download (receiver) and 2,59 Mbps upload (transceiver), both measured at noon at the tenth point and in the south.
Sintesis Adsorben Ampas Teh sebagai Penyerap Ion Logam Berat Timbal dalam Air Perdana, Akbar; Zarkasi, Ahmad; Hamdani, Dadan; Natalisanto, Adrianus Inu; Munir, Rahmawati
Progressive Physics Journal Vol. 5 No. 2 (2024): Progressive Physics Journal
Publisher : Program Studi Fisika, Jurusan Fisika, FMIPA, Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ppj.v5i2.1026

Abstract

Heavy metal pollution is still a serious problem today. One method that can be used to remove heavy metal content from water is the adsorption method. In the adsorption method, the choice of adsorbent is very important to optimize the adsorption process. One of the materials that can be used as an adsorbent is tea waste. Tea waste contains cellulose, which can be used to bind heavy metal ions. This research was conducted to synthesize adsorbents using tea waste and then test their ability to adsorb lead ions. The adsorbent synthesis process is divided into several stages, namely washing, drying, refining, soaking in HCl solution, and drying again. The results of the adsorption tests conducted found that the tea waste adsorbent could remove 99% of the lead metal ion content in the water. The conclusion from these results is that the synthesis process has succeeded in making tea waste adsorbent that can adsorb lead ions in water.
Verification of Co-60 Source in Brachytherapy Equipment Using TW33005 Well-Type Chamber Hemelia, Junita; Wardani, Pratiwi Sri; Intifadhah, Sahara Hamas; Zarkasi, Ahmad; Putri, Devina Rayzy Perwitasari Sutaji
Journal of Physics and Its Applications Vol 7, No 1 (2024): November 2024
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v7i1.24100

Abstract

Accidents in brachytherapy have occurred and are documented by the IAEA. These incidents are attributed to various factors, such as inaccurate sources, lack of independent verification, and equipment failures due to inadequate calibration. Verifying radioactive sources is crucial for ensuring patient safety. Verification is conducted to confirm that the measured source activity is accurate and stable. Accuracy and stability of source activity are two essential parameters in verification. Source activity accuracy indicates how closely the measured source activity aligns with the reference source activity, while source activity stability reflects the well-type chamber's ability to produce consistent results over time. This study aimed to verify the Co-60 sources at Dr. Kanujoso Djatiwibowo General Hospital using a TW33005 well-type chamber and analyze the results against national and international standards. The results showed that the Co-60 source activity values remained accurate and stable over five months. The highest accuracy was observed in November 2023 (-2.011%), while the lowest was in October 2023 (-2.397%). The highest stability was recorded in September 2023 (-0.416%), and the lowest in October 2023 (-2.090%). In conclusion, the Co-60 sources at Dr. Kanujoso Djatiwibowo General Hospital met the accuracy standards set by ESTRO and BAPETEN of 3% to 5% and the stability standard set by the IAEA of ±3%. This indicates that the sources are safe for use in brachytherapy.
Ekstraksi Frekuensi dari Bunyi Alqurans dengan Metode Discrete Fourier Transform: Studi Kasus Bunyi QS. Al-Fatihah Kusmiran, Amirin; Andi Syam Rizal; Sahara; Ahmad Zarkasi; Kasturi Ramadani
JFT : Jurnal Fisika dan Terapannya Vol 11 No 1 (2024): JUNI
Publisher : Universitas Islam Negeri Alauddin Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/jft.v11i1.45386

Abstract

The Quran is a miracle received by the Prophet Muhammad. Alquran can use to reduce anxiety in patients with acute coronary syndrome, hemodialysis, schizophrenia, etc., when the sound retardation of this Qur'an, especially QS. Al-Fatihah. The physical properties of waves can be analyzed using the discrete Fourier transform method for frequency extraction. This method is scripted using the Python programming language. The results show that frequency in Qs. Al-Fatihah/1:1-7 are random in range 150 Hz – 800 Hz.Thus, the frequencies of the Quran, especially QS Al-Fatihah, are uneven waves that can cause harmonic vibrations against brain waves.
Synthesis and Modeling of Adsorbents from Natural Materials for Heavy Metal Lead in Mahakam River Water Samples Rahmawati Munir; Ahmad Zarkasi; Dadan Hamdani; Sahara Hamas Intifadhah; Akbar Perdana; Alris Sanca Pratama Putra
Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat Vol 20, No 3 (2023): Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/flux.v20i3.16934

Abstract

The Mahakam River is a source of water for the people of Samarinda, East Kalimantan. However, Mahakam river water is not classified as quality water. As a result of industrial mining activities, river water is polluted by heavy metals such as Lead (Pb). These problems can be overcome by using the adsorption method to purify water. The adsorption method has become popular in adsorbing heavy metals contained in polluted water. The purpose of this study was to synthesize natural materials which are adsorbents for the heavy metal Pb. The materials used as natural adsorbents are household waste, namely ashes (AG), egg shells (CT), tea dregs (AT). Based on the results of the Atomic Absorption Spectroscopy (AAS) characterization test, data were obtained on the decrease in the concentration of heavy metal Pb in samples of Mahakam river water. The initial concentration of 1.8 mg/L became 0.24 mg/L (10 gr adsorbent AG) and became 0.17 mg/L (10 gr adsorbent AG+CT). While the use of AT adsorbent was applied to artificial waste with an initial concentration of 40 mg/L to 0.002 mg/L. Furthermore, according to data measurement, modeling was carried out using the Langmuir Isotherm and Freundlich Isotherm models to determine the adsorption capacity of tea dregs, eggshells, and ashes.
PELATIHAN SOFTWARE SIMULASI ELEKTRONIKA TINKERCAD UNTUK GURU FISIKA SMA KOTA SAMARINDA DAN SEKITARNYA Nurhanafi, Kholis; Zarkasi, Ahmad; Putri, Erlinda Ratnasari; Putri, Devina Rayzi Perwitasari Sutaji; Syahrir, Syahrir; Ummah, Auliya Rahmatul
Mitra Mahajana: Jurnal Pengabdian Masyarakat Vol. 6 No. 1 (2025): Volume 6, Nomor 1 Maret 2025
Publisher : LPPM Universitas Flores

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37478/mahajana.v6i1.4935

Abstract

School learning demands an optimal learning experience to fulfill the learning outcomes. At the Senior High School level, several science topics, particularly physics, require simulations to enhance students' understanding. A community service initiative was carried out in the form of training on using TinkerCad electronics simulation software for high school physics teachers in Samarinda and its surrounding areas. This activity aimed to provide physics teachers with alternative teaching media, particularly for the topic of electronics at the high school level. The training was attended by 21 participants and conducted using lectures, demonstrations, and mentoring methods. Based on the interview results, the majority of participants were unfamiliar with the TinkerCad software, making this training a valuable new resource for high school physics teachers in Samarinda and the surrounding regions.
Upaya Peningkatan Minat Belajar Sains Fisika di SDN 022 Samarinda Utara Melalui Pelatihan Pengukuran Dasar Munir, Rahmawati; Mislan, Mislan; Zarkasi, Ahmad; Putri, Erlinda Ratnasari; Wahidah, Wahidah; Mandang, Idris
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

Abstract

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.
Exploring The Influence of Electrode Material on Electrical Impedance Spectroscopy: A Comparative Analysis Ahmad Zarkasi; Mohammad Asrul; Kholis Nurhanafi; Rahmawati Munir; Amirin Kusmiran; Kormil Saputra
Frontier Advances in Applied Science and Engineering Vol. 2 No. 2 (2024)
Publisher : Tinta Emas Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59535/faase.v2i2.279

Abstract

Electrodes play a crucial role in impedance measurements using the EIS method. This study undertook a comparative analysis of impedance measurement outcomes using aluminum, iron, stainless steel, copper, and tin electrodes with mineral water and distilled water as the measurement objects. The impedance Bode plots for mineral water and distilled water showed similar trends across all electrodes, while the phase difference trends varied. In this experiment, copper electrodes emerge as the preferred choice due to their consistently low impedance, particularly at higher frequencies, and their stable phase difference patterns. Additionally, copper electrodes showed superior stability up to 25 kHz, while tin electrodes remained stable up to 50 kHz, albeit valid only from a frequency of 100 Hz. The varying impedance and phase difference in mineral water measurements align with the Warburg impedance circuit, due to the presence of more complex capacitive and inductive elements. Furthermore, measurements with distilled water showed a uniform Bode plot pattern of both impedance and phase difference across all electrodes, making the Randles circuit approach the most appropriate choice in this case. Overall, all electrode types exhibited distinct characteristics.
DETERMINING THE RELATIONSHIP BETWEEN TEMPERATURE AND TUNING FORK FREQUENCY CHANGES WITH POLYNOMIAL REGRESSION MODELLING Hasan, Aly; Natalisanto, Adrianus Inu; Zarkasi, Ahmad
Indonesian Physical Review Vol. 7 No. 2 (2024)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v7i2.263

Abstract

A tuning fork is a unique tool made of metal and shaped like the letter U, with one handle. Tuning forks can produce specific frequencies; usually, the value is written on the handle. This study aims to investigate the relationship between temperature and changes in tuning fork frequency and model it using polynomial regression. This research uses laboratory experiments with tuning forks with 341.3 Hz, 426.5 Hz, and 512 Hz frequencies. The temperature on the tuning fork varies from 30C to 220C with a difference of 10C. From the results of the study adjusted R-Square values sequentially 0.94745, 0.99565, and 0.97721, which stated the relationship between temperature and frequency changes. The Adjusted R-Square value close to 1 means that changes in temperature on the tuning fork greatly influence changes in the frequency produced by the tuning fork, and the polynomial regression model used is very suitable.
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