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INDONESIA
Jurnal Penelitian Saintek
Published by Universitas Negeri Yogyakarta
ISSN : 14123991     EISSN : 25287036     DOI : 10.21831
Core Subject : Science,
Decision Sciences, Operations Research & Management
Arjuna Subject : -
Articles 5 Documents
 1 
Search results for , issue "Vol 30, No 1 (2025)" : 5 Documents clear
The effect of automatic generation control (AGC) implementation on the electrical power system Samsurizal, Samsurizal; Afandi, Arif Nur; Sitanggan, Mario Martinus Land
Jurnal Penelitian Saintek Vol 30, No 1 (2025)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v30i1.68493

Abstract

To enhance system resilience and prevent widespread blackouts from potential disruptions, a structured scheme is needed to reduce the impact of such disturbances. One of PLN's breakthrough initiatives is the activation of Automatic Generation Control (AGC) in the Java-Madura-Bali electricity system. Since the existing Load Frequency Control (LFC) system at Tambak Lorok PLTGU has been inactive for some time, the plant was selected for AGC implementation. This system is managed automatically by the Java Control Center (JCC) Dispatcher through a SCADA control scheme. This study aims to examine the effect of AGC activation on power plant regulation by JCC Dispatchers and to compare the SCADA system performance at Tambak Lorok with that of other power plants. A quantitative method with a descriptive approach was used, relying on SCADA point-to-point testing and real-time load trials with JCC Dispatchers. The results showed that during real-time testing, the Java-Bali grid frequency remained between 50.154 Hz and 49.819 Hz. These findings confirm AGC's effectiveness and support its broader implementation as a reliable solution for maintaining frequency stability and addressing challenges posed by intermittent renewable energy sources.
Effectiveness of corncob-based activated carbon bioadsorbent for reducing iron and bromate levels in mineral water using a continuous method Alfiyatun, Riza; Kristianingrum, Susila
Jurnal Penelitian Saintek Vol 30, No 1 (2025)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v30i1.78144

Abstract

This study aims to determine the characteristics of activated carbon made from corn cobs and its effectiveness as a bioadsorbent in reducing iron and bromate levels in bottled drinking water (AMDK). The carbon was activated using 5% HCl and applied in a continuous column system, where the water flowed by gravity. Variations in adsorbent mass and flow rate were used to observe their influence on adsorption efficiency. Characterization results showed that the corn cob activated carbon met the SNI 06-3730-1995 standard, with a moisture content of 3.62%, ash 0.94%, volatile matter 5.9%, and pure activated carbon 89.8%. The optimum adsorbent mass was 1.3 grams, resulting in a decrease in iron levels from 5 mg/L to 0.0155 mg/L, and bromate from 0.08373 mg/L to 0.0015 mg/L"”both within the limits set by SNI 3553-2015. The removal efficiency (Ep) reached 99.69% for iron ions and 97.61% for bromate at a flow rate of 0.2 mL/min and a contact time of 120 minutes. The column method proved effective for filtering bottled drinking water.
The effectiveness of water spinach (Ipomoea aquatica) as a phytoremediator of leachate from Banyuroto landfill Widakdo, Widakdo; Suhartini, Suhartini
Jurnal Penelitian Saintek Vol 30, No 1 (2025)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v30i1.73551

Abstract

Water spinach (Ipomoea aquatica) possesses hyperaccumulator properties, a high level of tolerance, and fast growth. These characteristics indicate that water kale (Ipomoea aquatica) can remediate leachate which is a source of pollution around the Banyuroto landfill. This study aims to (1) evaluate the effectiveness of the water spinach plant (Ipomoea aquatica) as a phytoremediator for Banyuroto landfill leachate, (2) assess the plant's performance as a phytoremediator for Banyuroto landfill leachate. A single factor Completely Randomized Design (CRD) was used with Leachate concentration treatments of 10%, 20%, 30%. Observed parameters included leachate water quality (BOD, COD, TSS, pH, total N, cadmium) and plant performance (number of leaves and wet weight). Leachate water quality was analyzed using the effectiveness calculation, while plant performance was carried out using One Way Anova. The results showed the highest effectiveness of phytoremediation at the 10% level for BOD, COD, TSS parameters. The highest total effectiveness parameter N is at the 20% level. Cadmium parameters at all levels of effectiveness value are the same. Furtehrmore, leachate had no significant effect on the growth performance of water spinach.
The effect of land transportation infrastructure on congestion in Jayapura City Ramandei, Lazarus
Jurnal Penelitian Saintek Vol 30, No 1 (2025)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v30i1.74304

Abstract

The transportation sector has a significant impact on the environment, particularly in terms of urban air pollution, congestion, and road damage. Nevertheless, transportation remains essential to support economic activity, education, and daily work. This study aims to determine the effect of land transportation infrastructure on congestion in Jayapura City. This research employed a qualitative approach, with data collected through questionnaires. The data were analyzed using simple regression analysis.  The results showed that land transportation infrastructure has a significant effect on congestion in Jayapura City. Based on the partial t-test using SPSS, a t value of -8.957 was obtained with a probability value (sig value) of 0.000. Since this probability value is smaller than alpha (5%), it can be concluded that land transportation infrastructure partially has a significant effect on congestion. This study confirms that the improvement and management of land transportation infrastructure is essential to reduce congestion in Jayapura City, which in turn can support economic activities, education, and daily work.
Antioxidant and antibacterial activities of alkaloids from endophytic bacterium Pseudomonas hibiscicola Wk isolated from waru (Hibiscus tiliaceus) leaves Sarjono, Purbowatiningrum Ria; Laksmitasari, Nuraini Dwi; Asy'ari, Mukhammad; Ngadiwiyana, Ngadiwiyana; Ismiyarto, Ismiyarto; Fachriyah, Enny
Jurnal Penelitian Saintek Vol 30, No 1 (2025)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v30i1.77501

Abstract

This study aims to investigate the antioxidant and antibacterial activity from alkaloid extract. Alkaloid compounds were isolated from the endophytic bacteria Pseudomonas hibiscicola Wk, which was obtained from Hibiscus leaves. The alkaloid compounds were characterized using thin layer chromatography. The isolated alkaloid compounds were tested for total phenol content, and antioxidant activity. The phytochemical analysis of the alkaloid compounds from the endophytic bacteria Pseudomonas hibiscicola Wk showed a positive result for alkaloids, confirmed by an Rf value of 0.8125 which is similar to the Rf value of alkaloids from the periwinkle plant, namely vindoline (Rf = 0.85). Alkaloid compounds from the endophytic bacteria Pseudomonas hibiscicola Wk had the highest total phenol content of 2.390 mg gallic acid/gram sample at a concentration of 10.000 mg/L. These results indicate that the alkaloid compounds obtained contain phenol groups. The IC50 value obtained from the isolated alkaloid compound was 99.70 mg/L, demonstrating strong antioxidant capacity, and has the ability to inhibit the growth of E.coli and S.aureus bacterial.

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