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Akbar Sujiwa
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Faraday: Journal of Fundamental Physics, Research, and Applied Science
Published by Universitas Pembangunan Nasional Veteran Jawa Timur
ISSN : -     EISSN : 31091318     DOI : https://doi.org/10.33005/faraday.v1i1
Core Subject : Science, Engineering,
Computer Science & IT Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics
Faraday: Journal of Fundamental Physics, Research, and Applied Science publishes original articles on developments and research in both Classical and Modern Physics, encompassing theoretical studies, experimental investigations, and practical applications. The journal places particular emphasis on contributions that highlight the Indonesian context while also engaging with the global scientific community. Its scope includes, but is not limited to: Instrumentation Physics and Measurement—covering sensor systems, control systems, biomedical engineering, and nuclear instrumentation; Materials Science—with a focus on synthesis and characterization techniques, advanced materials, low-temperature physics, and exotic materials; Theoretical and Computational Physics—including high energy physics, gravitation and cosmology, astrophysics, nuclear and particle phenomenology, and computational and non-linear physics; as well as Earth Sciences, particularly in the areas of geophysics and astronomy.
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 16 Documents
 1   2 
Comparative Analysis of CCS811 Sensor Usage in Wearable Studies for Cigarette Smoke Detection: Literature Review Maniani, Billy; Sujiwa, Akbar; Wardhani, Primasari Cahya; Hasan, Nailul; Timur, Fajar
Faraday: Journal of Fundamental Physics, Research, and Applied Science Vol. 1 No. 2 (2025): Faraday: Journal of Fundamental Physics, Research, and Applied Science
Publisher : Universitas Pembangunan Nasional "Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/faraday.v1i2.16

Abstract

The CCS811 sensor is a metal oxide semiconductor (MOX)-based gas sensor that is widely used in wearable systems to monitor air quality personally, especially in detecting volatile organic compounds (VOCs) contained in cigarette smoke. This study aims to conduct a systematic review of various studies that implement the CCS811 sensor in wearable devices for cigarette smoke detection, focusing on aspects of accuracy, sensitivity, detection time, and the effect of room size. The method used is a systematic literature review of 19 scientific articles published in the last ten years. The results of the review show that the CCS811 has several advantages, such as low power consumption, compact sensor size, real-time VOC detection capability, and easy integration with the Internet of Things (IoT) system. Quantitatively, this sensor is able to detect TVOC concentrations in the range of 20–1158 ppb, with a response time of less than 20 seconds in a small space. However, limitations are still found in terms of selectivity to certain types of compounds and the lack of studies evaluating the effect of room characteristics on detection performance. This study recommends further testing in various real-world conditions as well as the application of machine learning algorithms to improve the accuracy and adaptability of the CCS811-based wearable system in effectively detecting cigarette smoke.
Characterization of an ODM Type K Thermocouple for Temperature Measurement Accuracy Dimas Arya, Muhammad; Hakim, Gelar Aji Auzan; FELLE, FELLEZIA RAHEL VIOLETA
Faraday: Journal of Fundamental Physics, Research, and Applied Science Vol. 1 No. 2 (2025): Faraday: Journal of Fundamental Physics, Research, and Applied Science
Publisher : Universitas Pembangunan Nasional "Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/faraday.v1i2.11

Abstract

This study characterizes and evaluates the performance of an ODM Type K thermocouple in measuring temperature within the range of 0°C to 100°C under controlled laboratory conditions. The experiment utilized a hot plate as the heat source, with melting ice and boiling water as reference points for 0°C and 100°C, respectively. The thermoelectric voltage generated by the thermocouple was measured using a digital multimeter and compared with readings from an ASTM mercury-in-glass thermometer as a reference. The results showed a strong linear relationship between thermoelectric voltage and temperature, consistent with the Seebeck effect. The average deviation between the thermocouple and the reference thermometer was approximately ±0.3°C, with maximum errors within ±1°C. These findings indicate that the ODM Type K thermocouple demonstrates high accuracy, good linearity, and stability, making it suitable for laboratory and industrial temperature measurement applications.
The Application of a Finite Impulse Response Low-Pass Filter for Noise Reduction in Voice Signals Wijaya, Fauziyah Vida Rahmah; Ramadhani, Prastika; Az Zahra, Ladya Cheryl; Sakinah; Sujiwa, Akbar
Faraday: Journal of Fundamental Physics, Research, and Applied Science Vol. 2 No. 1 (2026): Faraday: Journal of Fundamental Physics, Research, and Applied Science
Publisher : Universitas Pembangunan Nasional "Veteran" Jawa Timur

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Abstract

This study investigates the effect of noise on human voice signals and noise reduction efforts using digital signal processing techniques. The objective of this research is to analyze and compare the frequency characteristics and clarity of the original voice signal with those of noise-contaminated signal after undergoing a filtering process in MATLAB. The research methodology includes voice recording, superposition of the voice signal with noise, and filtering using a 50th-order Finite Impulse Response (FIR) low-pass filter with a cutoff frequency of 500 Hz implemented in MATLAB. The analysis is conducted in the frequency domain using the Fast Fourier Transform (FFT) and in the time domain through waveform observation. The results indicate that noise introduces high-frequency components and irregular amplitude fluctuations. After filtering, the high-frequency components are effectively attenuated, resulting in a smoother and more stable signal while preserving the primary characteristics of the human voice. These findings demonstrate that the FIR low-pass filter is effective in improving the quality of human voice signals.
Seismicity Analysis of Earthquake in Bengkulu Using Gutenberg-Richter and Omori laws Tobamba, Fiska; Meidji, Icha Untari; Jayadi, Harsano
Faraday: Journal of Fundamental Physics, Research, and Applied Science Vol. 2 No. 1 (2026): Faraday: Journal of Fundamental Physics, Research, and Applied Science
Publisher : Universitas Pembangunan Nasional "Veteran" Jawa Timur

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Abstract

Bengkulu Province is one of the regions in Indonesia with high seismic aktivity because it lies within the Sumatra tectonic plate zone and is crossed by the Sumatra Fault system. This tectonic setting makes Bengkulu highly vulnerable to Earthquake. This study analyzes the seismic characteristics of Bengkulu Using the Gutenberg-Richter law and examines the aftershock pattern following the major earthquake of june 4, 2000, based on the Omori-Utsu law. The data were obtained from the USGS earthquake catalog, consisting of earthquake records from 2015-2025 and afthershock data for 30 days after the mainshock. The Gutenberg-Richter Analysis evaluates the relationship between log10N and moment magnitude (Mw) to determine the a and b values. Meanwhile, Omori-Utsu Analysis examines the relationship between log10 n(t) and log10 (t+c) to obtain the parameters p and k. The result show that Bengkulu's seismicity is dominated by small to moderate earthquakes with relatively low b-values, indicating high tectonic stress conditions. The aftershock Analysis produced a p-value of 1.4822 with an R² value of 0.7767, showing rapid aftershock decay consistent with the Omori-Utsu law. These findings confirm Bengkulu has a high seismic Hazard level, emphasizing the need for continuous mitigation and preparedness efforts.
Comparison of Silver and Aluminum Patches on the Electromagnetic Radiation of a Microstrip Dipole Antenna Siregar, Aslam Chitami Priawan; Ardiyanti, Aprilia Dewi; Tamimah, Ni’matut
Faraday: Journal of Fundamental Physics, Research, and Applied Science Vol. 2 No. 1 (2026): Faraday: Journal of Fundamental Physics, Research, and Applied Science
Publisher : Universitas Pembangunan Nasional "Veteran" Jawa Timur

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Abstract

This paper compares silver (Ag) and aluminum (Al) as patch materials for a microstrip dipole antenna to examine how their electrical conductivities affect electromagnetic radiation performance. Both antennas were designed with identical geometrical and substrate parameters using the Finite-Difference Time-Domain (FDTD) method, varying only the patch material. Simulation results show that the resonant frequencies are 2.4700 GHz for Ag and 2.4649 GHz for Al, with excellent VSWR values 1.0839 and 1.0836 and return loss below –27 dB. Both materials exhibit reflected power below 0.2% and have nearly identical radiated power, namely 0.3647 W for silver (Ag) and 0.3646 W for aluminum (Al). Overall, silver and aluminum demonstrate almost identical radiation characteristics. Silver offers slightly better conductivity, while aluminum provides similar efficiency at lower cost, making it a practical alternative for lightweight and economical microstrip antenna applications.
Optical Band Gap of PMMA: Cody, ASF, and DASF Methods Compared to Tauc Hilmi, Allif Rosyidy Hilmi; Setiawan, Yofinda Eka; Hasan, Nailul
Faraday: Journal of Fundamental Physics, Research, and Applied Science Vol. 2 No. 1 (2026): Faraday: Journal of Fundamental Physics, Research, and Applied Science
Publisher : Universitas Pembangunan Nasional "Veteran" Jawa Timur

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Abstract

This study aimed to determine the optical band gap of polymethyl methacrylate (PMMA) using alternative methods to the conventional Tauc plot. PMMA was prepared by solution casting and characterized using UV–Vis spectroscopy. The optical band gap was approximated by applying the Cody, Absorption Spectrum Fitting (ASF), and Derivative ASF (DASF) methods, and the results were compared with those from the Tauc approach. The optical band gap values ranged from 3.10 eV to 4.94 eV, which fall within or near the range reported in the literature for PMMA, depending on the analysis method and transition model used. Each method had distinct advantages: the Cody method provided a clearer linear region for amorphous systems, ASF offered a practical approach that did not require sample-thickness information, and DASF enhanced precision through derivative-based analysis. The observation of band gap values corresponding to both direct and indirect optical transitions suggests the presence of multiple effective optical transition pathways in amorphous PMMA. These findings demonstrate that the Cody, ASF, and DASF methods can serve as reliable alternatives to the Tauc method for analyzing the optical properties of polymeric materials.

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