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All Journal Faraday: Journal of Fundamental Physics, Research, and Applied Science
Fajar Timur
Universitas Pembangunan Nasional "Veteran" Jawa Timur
Computer Science & IT Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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Comparative Analysis of CCS811 Sensor Usage in Wearable Studies for Cigarette Smoke Detection: Literature Review Billy Maniani; Akbar Sujiwa; Primasari Cahya Wardhani; Nailul Hasan; Fajar Timur
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.
A Comparative Analysis of the Mechanical Properties of Cortical–Trabecular Bone Materials and Calcium Silicate Materials for Bone Tissue Engineering Applications Sovi Anggraini Armita Dewi; Arum Sinda Santika; Primasari Cahya Wardhani; Fajar Timur
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/faraday.v2i1.62

Abstract

Biomechanical modeling of bone plays an important role in bone tissue engineering by enabling the understanding of the mechanical response of natural bone and substitute materials under physiological loading. This study aims to compare the mechanical properties of cortical–trabecular bone materials as an environment for tissue support with calcium silicate (CaSiO₃) as an engineered artificial substitute using the finite element method. A long-bone phantom model in the form of a hollow cylindrical structure was developed by separating cortical and trabecular regions and analyzed using ANSYS Workbench. The applied loading scenarios included lateral bending with a load of 500 N and axial compression with a load of 1000 N. The analyzed mechanical parameters were total deformation and equivalent (von Mises) stress. Simulation results show that cortical–trabecular bone is able to distribute stress more adaptively, with greater deformation occurring in the trabecular region and stress concentration in the cortical layer. Meanwhile, calcium silicate exhibits higher stiffness with smaller deformation but comparable maximum stress values. These findings indicate that the compatibility of mechanical properties between scaffold materials and natural bone significantly affects the effectiveness of bone tissue engineering applications.
Comparative Analysis of Radiation Dose Rate on Brachytherapy Commissioning Data and Radiation Safety Evaluation at R.T Notopuro Sidoarjo Hospital Dedshita Karima Putri Setijadi; Fajar Timur
Faraday: Journal of Fundamental Physics, Research, and Applied Science Vol. 2 No. 2 (2026): Faraday: Journal of Fundamental Physics, Research, and Applied Science
Publisher : Universitas Pembangunan Nasional "Veteran" Jawa Timur

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Abstract

Brachytherapy is a modality of internal radiotherapy that utilize radioactive sources placed close to the target to increase effectiveness in cancer treatment. However, before the device is used in clinical service, commissioning is required to ensure that the device complies with factory specifications and radiation safety standards. This study aims to analyze the factors that cause the difference in radiation dose rate values between commissioning data and the results of radiation exposure measurement in 2026 on SagiNova brachytherapy machines with Cpbalt-60 radioactive sources at the Integrated Cancer Service Installation of R.T Notopuro Sidoarjo Hospital. The method used in this study is direct measurement using the Gamma Rad Eye G20-10 surveymeter at several measurement points with distances 5 cm and 1 m around the brachytherapy device. The results showed that at a distance of 5 cm there was a difference of 3.34 μSv/h to 19.34 μSv/h, while at a distance of 1 m there was a difference of 0.03 μSv/h to 0.75 μSv/h. The results obtained indicate that the dosage rate value in 2026 has a lower value than in the commissioning data due to the influence of the activity value of the Cobalt-60 source which decreases each time. However, the results showed that the measurement value was still within the safe limit of 20 mSv/year for radiation workers.
Co-Authors Akbar Sujiwa Arum Sinda Santika Billy Maniani Dedshita Karima Putri Setijadi Nailul Hasan Sovi Anggraini Armita Dewi