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All Journal Jurnal Penelitian Saintek POSITRON Jurnal Fisika Unand JGE (Jurnal Geofisika Eksplorasi) Jurnal Informatika dan Teknik Elektro Terapan Jurnal Fisika FLUX JPSE (Journal of Physical Science and Engineering) Indonesian Physical Review Navigation Physics : Journal of Physics Education Mitra Mahajana: Jurnal Pengabdian Masyarakat Progressive Physics Journal Jurnal Ilmu Fisika dan Terapannya (JIFTA) InSTEM Frontier Advances in Applied Science and Engineering
Kholis Nurhanafi
Department Of Physics, Faculty Of Mathematics And Natural Sciences, Universitas Mulawarman
Aerospace Engineering Agriculture, Biological Sciences & Forestry 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 Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Public Health Social Sciences Other

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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

Abstract

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.
X-ray Absorption Near Edge Structure (XANES) Spectrum Interpretation for LiFePO4-Silicon Doped Cathode Material Sahara Hamas Intifadhah; Kholis Nurhanafi; Fahmi Astuti; Rahmawati Munir; Dadan Hamdani; Darminto Darminto
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.12.3.348-354.2023

Abstract

LiFePO4-Silicon doped has been widely developed as a battery cathode material. Due to the doping of silicon atoms, this study aims to determine the peak energy (E0), oxidation state and percentage of component composition for Fe K-edge. The experimental sample used are LFP Si-0%, LFP Si-1%, LFP Si-3% and LFP Si-6%. These samples were characterized using XAS (X-ray Absorption Spectroscopy). XANES spectrum showed the peak energy of Pre-edge area is 7113.08 – 7114.49 eV. The oxidation state of Fe atoms were increased and tend to be Fe3+ than Fe2+. Moreover, Linear Combination Fitting (LCF) used to determine the ratio composition FeO/Fe2O3 in experimental samples. The ratio composition indicated Fe atom is multivalent, when the percentage of silicon-doped increases, the ratio of Fe3+ increased.It has been found that the presence of silicon atoms in the LiFePO4 structure has an effect in electronic structure.
MICROTREMOR CHARACTERISTICS ON THE SURFACE OF BRIBIN UNDERGROUND RIVER, GUNUNG SEWU KARST AREA, BASED ON SPECTRAL ANALYSIS, ANALYSIS OF HORIZONTAL TO VERTICAL SPECTRAL RATIO (HVSR) CURVE, AND TIME FREQUENCY ANALYSIS (TFA) NURHANAFI KHOLIS; wibowo Nugroho Budi; Sumardi Yosaphat
Jurnal Ilmu Fisika dan Terapannya (JIFTA) Vol 5, No 2 (2016): Jurnal Fisika
Publisher : Prodi Fisika, Departemen Pendidikan Fisika

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

Abstract

This research aimed to determine microtremor characteristics in the area pass by Bribin Underground River and around its surface.Microtremor measured on fiveteen points on Bribin Underground Research line using Digital Portable Seismograph tools. The result of measurement recorded by three waves component and analized by Fast Fourier Transform (FFT) algoritm, and Konno-Ohmachi smoothing. Then, data were analized with Horizontal to Vertical Spectral Ratio (HVSR) and Time Frequency Analysis (TFA).The results of this research were microtremor characteristics on the surface of Bribin Underground River was determined by frequency at Fourier spectral peak of microtremor signal, these values were 0,44-0,78 Hz for EW horizontal component, 0,29-0,78 Hz for NS horizontal component, and 0,43-0,78 Hz for vertical component. Frequency of HVSR curve peak was between 1,0-15,5 Hz. Based on microtremor TFA curve of vertical component, research area was classified into two zones, and there was no spesific value which show (berkembangnya) Bribin Underground River line at research area based on frequency characteristics of Fourier spectral peak each microtremor component. The area (yang dilalui) Bribin Underground River was at 5,5-15,5 Hz based on HVSR curve analysis, and most was at zone II due to microtremor TFA curve characteristics of vertical component. Keywords: Microtremor Characteristics, Bribin Underground River
Mikrozonasi Berdasarkan Data Mikrotremor dan Kecepatan Gelombang Geser di Kotamadya Yogyakarta Purnama, Aditya Yoga; Nurcahya, Budi Eka; Nurhanafi, Kholis; Perdhana, Radhitya
POSITRON Vol 11, No 2 (2021): Vol. 11 No. 2 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/positron.v11i2.46860

Abstract

Gempabumi Yogyakarta dengan magnitude 6,3 Skala Richter yang terjadi pada tahun 2006 menyebabkan kerusakan bangunan di Kota Yogyakarta dan sekitarnya. Kerusakan banyak terjadi di daerah sedimen Yogyakarta daripada di perbukitan Wonosari yang memiliki lapisan lebih keras. Kerusakan ini mengindikasikan adanya kontrol efek tapak lokal. Penelitian ini bertujuan untuk memetakan daerah rawan kerusakan gempabumi di Kotamadya Yogyakarta berdasarkan analisis kurva Horizontal-to-Vertical Spectral Ratio (HVSR) dan mengetahui litologi bawah permukaan berdasarkan ground profiles kecepatan gelombang geser (Vs) dengan metode inversi kurva HVSR. Penelitian dilakukan di Kotamadya Yogyakarta dan sekitarnya yang dibatasi pada koordinat 7o45’58.09’’- 7o50’59.01’’ Lintang Selatan dan 110o19’7.87’’-110o24’35.43’’ Bujur Timur. Data mikrotremor sebanyak 280 diolah menggunakan metode HVSR. Proses inversi HVSR juga dilakukan untuk memperkirakan model perlapisan tanah. Hasil dari penelitian menunjukkan bahwa nilai frekuensi dominan (fo) di Kotamadya Yogyakarta dan sekitarnya berkisar antara 1,1-5,8 Hz, nilai amplifikasi (A0) berkisar antara 1-21, nilai Vs30 berkisar antara 210-376 m/s. Hasil inversi menunjukkan bahwa ketebalan lapisan sedimen di Kotamadya Yogyakarta dan sekitarnya berkisar antara 104 meter hingga 262 meter. Persebaran daerah lebih rentan secara seismik terdapat pada nilai amplifikasi tinggi sebesar 9-21 dengan rentang frekuensi 1,1-2,3 Hz yaitu di Kecamatan Sewon, Banguntapan dan Umbulharjo. Sebaran lokasi kejadian likuifaksi bersesuaian dengan nilai kecepatan gelombang geser rendah dengan rentang 210-262 m/s dengan jenis tanah sedang (SD) yaitu di Kecamatan Sewon, Banguntapan dan Umbulharjo.
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

Abstract

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

Abstract

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

Abstract

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.
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%.
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.
An Internet of Things (IoT)-based Microclimate Parameter Measurement Tool (Temperature, Humidity, and Sunlight Intensity) for Coastal Areas Zarkasi, Ahmad; Nurhanafi, Kholis; Syahrir, Syahrir
Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat Vol 21, No 1 (2024): 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.v21i1.17929

Abstract

Climate parameters such as temperature, humidity, and solar light intensity can affect various things in the environment and its components such as vegetation, animals, and humans. In this research, an internet of things (IoT)-based climate parameter measurement tool has been created. The use of IoT systems offers flexibility and ease of access for observers to conduct monitoring. The designed measuring instrument has been tested and compared with a standardized measuring instrument, namely the Mastech MS6300 Environment Multitester. The test results show accuracy values of 97.1%, 95.1%, and 87.2% for temperature, humidity, and sunlight intensity measurements, respectively. The results of the measuring instrument design are implemented in coastal areas (beaches). From the results obtained, the three parameters measured tend to be stable in the morning, afternoon, and evening. Meanwhile, during the afternoon the measured climate parameters are quite fluctuating. In general, the designed measuring instrument has been able to work well and is feasible to be implemented directly.
Co-Authors Aditya Yoga Purnama Adrianus Inu Natalisanto Ahmad Zarkasi Ahmad Zarkasi Amirin Kusmiran Ariyanthi, Gita Putri Astuti, Fahmi Budi Eka Nurcahya, Budi Eka Dadan Hamdani Dadan Hamdani, Dadan Darminto . Darminto Darminto Erlinda Ratnasari Putri Fahmi Astuti, Fahmi Hananda Putra, Muhammad Fauzan Hidayatullah, Muhammad Intifadhah, Sahara Hamas Jerri, Alyadris Kormil Saputra Melyyanti, Meli Mislan Mohammad Asrul Munir, Rahmawati Nugroho Budi Wibowo Nugroho Budi Wibowo Nur Azis, Khafidh Nuraidha, Amalia C Nurohman, Ali Perdana, Akbar Perdhana, Radhitya Putri, Devina Rayzi Perwitasari Sutaji Rafika Ade Rahayu Rahayu, Rafika Ade Sumardi Yosaphat Susanti Susanti Syahrir Syahrir Syahrir Syahrir Ummah, Auliya Rahmatul Wibowo Nugroho Budi Wulandari, Darmawati