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INDONESIA
Teknika: Jurnal Sains dan Teknologi
Published by Universitas Sultan Ageng Tirtayasa
ISSN : 1693024X     EISSN : 26544113     DOI : http://dx.doi.org/10.36055/tjst
Core Subject : Engineering,
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering
Teknika: Jurnal Sains dan Teknologi merupakan jurnal peer-reviewed dalam Bahasa Indonesia di bidang keteknikan, diantaranya bidang teknik sipil, bidang teknik mesin, bidang teknik industri, bidang teknik kimia, bidang teknik metalurgi, dan bidang teknik elektro.
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Articles 15 Documents
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Search results for , issue "Vol 21, No 1 (2025): June 2025" : 15 Documents clear
Prototype system for turbidity and TDS measurement of refill drinking water using Arduino microcontroller Saraswati, Irma; Himawan, Ganda; Wiryadinata, Romi; Ramadhani, Ahmad; Haryanto, Heri; Franata, Nauval; Yudono, Muchtar Ali Setyo; Erlindriyani, Ratu Verlaili
Jurnal Teknika Vol 21, No 1 (2025): June 2025
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/tjst.v21i1.30486

Abstract

Access to clean drinking water is critical, yet monitoring its quality in refill depots, especially in resource-limited areas, remains a challenge due to costly equipment and limited laboratory access. This work develops an Arduino Uno microcontroller-based prototype of a refill drinking water quality monitoring system based on turbidity and Total Dissolved Solids (TDS) sensors. An LED indicator serves as a visual warning and an LCD module shows real-time measurement results in the system. Five water samples from different depots underwent tests against standard Turbidity Meter and TDS Meter measuring tools. The TDS sensor fit for water quality monitoring since it displayed good performance with a low error of 0.32%–4.02% and high linearity to dissolved substance levels. Whereas the turbidity sensor is more suited for water with moderate to high turbidity, it has limited accuracy, particularly in water with low turbidity (< 5 NTU), with an error of 17%–72%. Particularly in places with limited access to labs and the Internet, this system is expected to be a sensible and affordable solution for independent refill drinking water quality monitoring. Additional development is advised to add IoT integration for remote monitoring, data storage tools, and sensitivity enhancement of the turbidity sensor.
Thermal effectiveness comparison analysis on air-based PV/T system with varying top-to-bottom cavity ratios using CFD simulation Yanuariska, Nabil Putra Wahyu; Suryaman, Nia Nuraeni; Rajani, Ahmad
Jurnal Teknika Vol 21, No 1 (2025): June 2025
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/tjst.v21i1.32679

Abstract

The development of air-based thermal photovoltaic systems is still challenged in optimizing heat transfer efficiency. One important aspect in this endeavor is to find and improve the cooling channel geometry design. To address this, this study aims to evaluate the effect of several variations of upper and lower cavities on the performance of dual-pass PV/T systems using a computational fluid dynamics (CFD) simulation approach. Four geometry ratio configurations (1:1, 1:4, 2:3, and 3:2) were analyzed based on turbulence intensity, effective thermal conductivity, and air temperature output. The investigation results show that the 3:2 configuration excels in several parameters. The findings highlighted that the 3:2 geometry showed improved turbulence generation and heat exchanger efficiency compared to the other shapes. Specifically, the 3:2 geometry generated turbulence intensity reaching 78% compared to the other geometries, which did not even reach 60%. In addition, the 3:2 geometry produces superior effective thermal conductivity and the most uniform heat transfer. Meanwhile, the 1:4 configuration achieved the highest outlet temperature of 29.54°C, making this geometry potentially suitable for solar energy-based drying applications. The investigation results provide practical insights and geometry-based PV/T system design alloys to improve energy efficiency in sustainable thermal applications.
Automation system in Oyster mushroom cultivation using Mamdani fuzzy logic Zola, Andrian; Lindawati, Lindawati; Sholihin, Sholihin
Jurnal Teknika Vol 21, No 1 (2025): June 2025
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/tjst.v21i1.34489

Abstract

Oyster mushrooms often struggle to grow optimally due to unpredictable environmental factors like temperature, air humidity, and growing medium moisture. To address this, an IoT-based automation system with Mamdani fuzzy logic and MQTT communication was developed to carefully regulate these conditions. This study created such a system to optimize the growing environment. It uses a DHT22 sensor to monitor temperature and humidity, a capacitive soil moisture sensor connected to an ESP32 microcontroller, and a Mitsubishi FX3U-14MR PLC for management. Mamdani fuzzy logic and the MQTT protocol process and share data in real-time. Tests show the system is highly accurate, with an error rate below 5% compared to manual calculations, while also reducing crop failure risks, speeding up harvests by up to one day compared to traditional methods, and enhancing yield quality and efficiency. This approach offers a practical, scalable solution for modern oyster mushroom farming, minimizing human effort and ensuring environmental stability.
Design and simulation of microstrip phased array antenna for 2.0–2.8 GHz Handayani, Kurnia Wati Pascitra; Soim, Sopian; Anugraha, Nurhajar
Jurnal Teknika Vol 21, No 1 (2025): June 2025
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/tjst.v21i1.33816

Abstract

This study aims to create and test a microstrip array antenna with eight elements that works in the 2.0–2.8 GHz frequency range. We use CST Studio Suite to run simulations that check performance metrics like return loss (S11), VSWR, gain, and radiation pattern. The results show that the antenna has a return loss of -24 dB and a VSWR of 1.13 at a frequency of 2.4 GHz, which means the impedance is very well matched. However, the radiation and total efficiencies at 2 GHz and 2.8 GHz are still low, so the design can't handle the highest frequencies in the working range. The 126 MHz bandwidth should be able to cover channels 1 to 13 in Band 40 (2300–2400 MHz), but the antenna needs to work better at frequencies above 2.4 GHz to be helpful for all applications. Compared to other studies, this antenna's gain and efficiency are still not as good as those of other phased array antennas. This study is the first step towards creating a possible digital beam steering system that adaptively aligns signals to user movement to reduce interference in mobile environments.
Seismic microzonation and geotechnical characteristics of Manna City, South Bengkulu Anjelah, Aza Geby; Mase, Lindung Zalbuin; Amri, Khairul; Misliniyati, Rena; Hardiansyah, Hardiansyah
Jurnal Teknika Vol 21, No 1 (2025): June 2025
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/tjst.v21i1.32748

Abstract

As one of the disaster-prone areas in Manna, this city is prone to disasters. This study aims to evaluate the potential risk of earthquakes in Manna through a seismic microzonation approach. Using amplification factor and dominant frequency data, this study produced a microzonation map showing areas with a higher risk of earthquake damage. The methods applied in this study include the Horizontal-to-Vertical Spectral Ratio (HVSR) and Multichannel Analysis of Surface Waves (MASW), which enable analysis of soil properties and their influence on earthquake vibration amplification. The study results reveal that areas with soft soil and high amplification, such as Pasar Manna and Pino Raya, are at higher risk of significant damage during an earthquake. Based on these findings, we recommend mitigation measures such as spatial planning that considers seismic risk, the implementation of earthquake-resistant construction, and enhancing community preparedness. By integrating these microzonation results into development policies and disaster mitigation strategies, it is hoped that the city of Manna can reduce the potential damage caused by earthquakes.

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