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JRST (Jurnal Riset Sains dan Teknologi)
Published by Universitas Muhammadiyah Purwokerto
ISSN : 25799118     EISSN : 25499750     DOI : http://dx.doi.org/10.30595/jrst
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Engineering
JRST (Jurnal Riset Sains dan Teknologi) adalah jurnal peer reviewed dan Open-Acces. JRST merupakan jurnal yang diterbitkan oleh Lembaga Publikasi Ilmiah dan Penerbitan (LPIP) Universitas Muhammadiyah Purwokerto. JRST mengundang para peneliti, dosen, dan praktisi di seluruh dunia untuk bertukar dan memajukan keilmuan di bidang sains dan teknologi yang meliputi bidang Matematika, Kimia, Biologi, Teknologi Rekayasa dan Keteknikan, Farmasi, Geografi, Komputer dan Teknologi Informasi. Dokumen yang dikirim harus dalam format Ms. Word dan ditulis sesuai dengan panduan penulisan. JRST terbit 2 kali dalam setahun pada bulan Maret dan September.
Arjuna Subject : Energi (semua kategori) - Energi (Lain-Lain)
Articles 214 Documents
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Identification and Characterization of Plant Vegetation in the Very Acid Environment of Kawah Putih Bandung Anik Nafisah Maulida; Muhamad Jalil
JRST (Jurnal Riset Sains dan Teknologi) Volume 9 No. 2 September 2025: JRST
Publisher : Universitas Muhammadiyah Purwokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30595/jrst.v9i2.24186

Abstract

Kawah Putih in Bandung Regency is an extreme environment with volcanic characteristics such as fluctuating temperatures, low soil pH and high sulfur levels. This research aims to identify and characterize plants in the region, as well as assess their morphological and physiological adaptations to extreme conditions. The field survey method in June 2024 recorded plant species and their characteristics. Some of the identified species include Vaccinium varingifolium (Cantigi), Polypodium feei (Tangkur Fern), Histiopteris incisa (Batwing Fern), and Litsea cubeba (Lemo). These plants show special adaptations: Vaccinium varingifolium has the ability to adapt to drought and high temperatures, Polypodium feei and Histiopteris incisa are able to overcome nutritional deficiencies and exposure to sulfur, while Litsea cubeba with its deep root adaptations can detoxify the environment. This research provides insight into plant adaptation strategies in extreme environments and the importance of conservation to protect local biodiversity and the economic potential of these plants.
Reconstruction of Low-Resolution Facial Images Using Improvements to the FSRCNN Model with Parallel Feature Extraction Layers and Residual Connections Tommy Tommy; Rosyidah Siregar; Edy Rahman Syahputra
JRST (Jurnal Riset Sains dan Teknologi) Volume 9 No. 2 September 2025: JRST
Publisher : Universitas Muhammadiyah Purwokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30595/jrst.v9i2.24237

Abstract

Enhancing the quality of reconstructing low-resolution facial images poses a significant challenge in various applications, particularly in CCTV-based surveillance. This study develops a Fast Super-Resolution Convolutional Neural Network (FSRCNN) model with the addition of parallel feature extraction layers and residual connections from these layers to the expanding layer to improve the reconstruction quality of faces from low resolution. The proposed model is tested using two datasets: CelebA and CCTV footage. The tests are conducted for two reconstruction scales, namely from LR to HR and from LR to intermediate. The results demonstrate that the proposed model consistently outperforms the standard FSRCNN. In the LR to HR reconstruction, the proposed model achieves an average PSNR improvement of 1.24 dB and an SSIM increase of 0.0584 on the CelebA dataset. For the CCTV dataset, an average PSNR enhancement of 0.52 dB and an SSIM improvement of 0.025 are attained. While this model significantly enhances image quality, several limitations were identified regarding performance on more varied CCTV images and the higher complexity of the model.
Comparison of Anode Types on Electrical Power and Organic Removal using Microbial Fuel Cells Integrated with Anaerobic Baffled Reactor Syadzadhiya Qothrunada Zakiyayasin Nisa'; Restu H. A. Murti; Nurvita Cundaningsih; M. Ardiansyah Dwi Tama; Nur Laili A. Mukharomah
JRST (Jurnal Riset Sains dan Teknologi) Volume 9 No. 2 September 2025: JRST
Publisher : Universitas Muhammadiyah Purwokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30595/jrst.v9i2.24240

Abstract

The tofu production process produces liquid waste that has a high organic content and has the potential to pollute water bodies if not treated. The combination of Microbial Fuel Cells (MFCs) and Anaerobic Baffled Reactors (ABR) presents an effective solution to treat this liquid waste while generating electricity. The purpose of this study was to analyze the effect of the type of anode in the MFCs-ABR system on electrical power (mW) and COD reduction in tofu liquid waste. The methodology used includes processing tofu liquid waste with variations in the types of zinc and stainless steel anodes. The parameters observed were electrical power and COD reduction efficiency at retention times of 0, 24, 48, 72, and 96 hours. The results showed that the zinc anode produced electrical power reaching 0.38 mW and showed a COD reduction efficiency of 55.85% at 96 hours. The stainless steel anode produced electrical power of 0.18 mW and a COD reduction efficiency of 52.80% at 96 hours. This study shows that the type of anode affects the electrical power generated in the MFCs system.
Chlorophyll-a Analysis in the Coastal Waters of Nusa Lembongan using Sentinel-2 Image Data Sagung Putri Chandra Astiti; I Gusti Ngurah Kerta Arsana; I Putu Gustave Suryantara Pariartha
JRST (Jurnal Riset Sains dan Teknologi) Volume 9 No. 2 September 2025: JRST
Publisher : Universitas Muhammadiyah Purwokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30595/jrst.v9i2.24323

Abstract

Nusa Lembongan is a potential area for seaweed cultivation and is the largest commodity producing the best seaweed on the island of Bali. This shows that the waters in Nusa Lembongan are included in fertile waters. One indicator in determining the level of fertility in a water area is by analyzing the chlorophyll-a value. One method for analyzing the chlorophyll-a value is using remote sensing methods. The image data used in this study were Sentinel-2A and Sentinel-2B level 1C image data. The calculation of chlorophyll-a analysis used the Case 2 Regional Coast Color (C2RCC) processor. The C2RCC processor used in the analysis is included in the Sentinel Application Platform (SNAP) application. The results of the analysis showed that the chlorophyll-a value in the dry season was higher than in the rainy season. The maximum value of chlorophyll-a analysis in the dry season was 40.92 mg/m3 while the maximum value of chlorophyll-a analysis in the rainy season was 40.89 mg/m3. The locations with the highest chlorophyll-a values ​​in the coastal waters of Nusa Lembongan are in the mangrove forest ecosystem in Jungutbatu Village, seaweed cultivation in Lembongan Village and coral reef ecosystem in Tanjung Ental.
Diversity of Bird Species in the Samarendah Park Area Samarinda City East Kalimantan Province Muhamad Agil; Raihan Raihan; Syifa Aulia Putri; Dina Firda Safitri; Intan Nur Aini; Melati Melati; Amul Lihan; Cindi Amelia Putri; Firda Latifah Ashari; Titi Windiani; Anisa Tatia Putri
JRST (Jurnal Riset Sains dan Teknologi) Volume 9 No. 2 September 2025: JRST
Publisher : Universitas Muhammadiyah Purwokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30595/jrst.v9i2.24383

Abstract

Every city has parks or green areas which have an important function in creating a healthy and comfortable environment. Samarendah Park, located in the city of Samarinda, is a city park area filled with various types of vegetation such as trees, grass and others. The presence of that vegetation allows various types of birds to come and search for food or build nests. The diversity of bird species in Samarendah Park is not yet known, making it very important to conduct research. The aim of this study is to determine the diversity index of bird species found in Samarendah Park, Samarinda. The method used in this research is Point Count. Each bird species observed at the observation points is noted for its morphology, counted, documented, and identified. The obtained data were analyzed using the Diversity Index (H’), Relative Abundance Index (RAI), Evenness Index, Richness Index, Feeding Guild, and conservation status based on the International Union for Conservation of Nature. (IUCN). The research results obtained 7 types of birds with a diversity index value of 1.36, which falls into the moderate category. The highest IKR value is Passer montanus at 56.03%, the Species Evenness Index value is 0.7, and the Species Richness Index is 1.26. The results of the Feeding Guild analysis revealed 3 types of omnivores, 2 types of insectivores, and 2 types of granivores. As for the conservation status of all the bird species found, they are classified as Least Concern. (LC).
Effect of Time Variation and Mole Ratio on Biodiesel Production from Coconut Oil Using CaO Catalyst via Transesterification Method Grace Trinita; Dessy Agustina Sari; Muhammad Fahmi Hakim
JRST (Jurnal Riset Sains dan Teknologi) Volume 9 No. 2 September 2025: JRST
Publisher : Universitas Muhammadiyah Purwokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30595/jrst.v9i2.24387

Abstract

The use of fossil fuels by the world resulted in an impulse for the use of renewable energy sources including biodiesel. In the present investigation, the objective is to find out the best conditions of coconut oil transesterification into biodiesel for transesterification source of the homogeneous basic catalyst of CaO. The experiments were conducted by varying the reaction time (100, 120 and 150 min), the molar ratio of coconut oil to methanol (1:12, 1:15 and 1:18), and temperature (60°C) as a fixed level in the experimental plan The optimum condition of reaction was at 1:15 molar ratio and a time of 120 min producing biodiesel that meets the (SNI 7182:2015) Indonesian National Standard with properties; density was 858.20±26.95 kg/m3, viscosity was 2.64±0.22 cSt, methyl ester content was 96.14±0.73%. Furthermore, the utilization of CaO catalyst not only improved the quality of biodiesel, but also possessed economic and environmental benefits compared with traditional homogeneous catalysts. These results confirm the feasibility of using coconut oil as a cheap and sustainable raw materials for biodiesel production as well as their effective use in larger scale production of renewable energy.
Optimization of Mechanical Properties of Rotary Friction Welding (RFW) Joints in AISI 1008 Steel with Friction Time Variation Yustiasih Purwaningrum; Rachnaldy Putra; Excel Rifky Fachreza
JRST (Jurnal Riset Sains dan Teknologi) Volume 9 No. 2 September 2025: JRST
Publisher : Universitas Muhammadiyah Purwokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30595/jrst.v9i2.24402

Abstract

One method than can be used to joint solid cylinders is Rotary Friction Welding (RFW). RFW is a Type solid-state welding that has the advantage of not requiring filler, shielding gas and produces good mechanical properties because the joining occurs below the base metal temperature. This study aims was to determine the effect of friction time on the physical and mechanical properties of Rotary Friction Welding (RFW) joints in AISI 1008 steel. RFW welding is carried out with a rotation speed of 1,170 RPM and friction plunge of 3 mm and forging depth 2 mm with three kinds of welding time, 3 minutes, 4 minutes and 5 minutes were investigated.  The average temperature of RFW welding with variations of welding time (3-minute, 4-minute and 5-minute) are 1,022.3°C, 1034.5°C and 1,062.7°C. The physical properties of the weld joint were obtained from photomacro using an optical microscope and corrosion testing using the weight loss method. The mechanical properties of the RFW weld joint were determined from tensile and bending tests using a Universal Testing Machine as well as hardness testing using the Vickers Microhardness method. Photomacro observations show that the longer the welding time used in RFW welding, the wider the welded area. The test results show that optimal physical and mechanical properties were obtained on RFW weld joints with a welding time variation of 4 minutes. At the 4-minute variation, the highest tensile and bending strength values were obtained compared to other time variations. As for the hardness testing of the welding zone with a friction  time of 4 minutes, it has the smallest value compared to other variations in welding time (3 minutes and 5 minutes). For the base metal and the HAZ, the hardness values for all variations are relatively the same because the materials used are the same and the welding heat is not high enough to change the microstructure in the area. Corrosion testing conducted for 50 days showed that all RFW welds with welding time variations had excellent corrosion resistance values.
Formula Optimization of Roselle Flower Extract as Clay Facial Soap Hidayah Anisa Fitri; Ghaliyah Kusuma Wardani; Ika Yuni Astuti; Indri Hapsari
JRST (Jurnal Riset Sains dan Teknologi) Volume 9 No. 2 September 2025: JRST
Publisher : Universitas Muhammadiyah Purwokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30595/jrst.v9i2.24495

Abstract

Roselle flower is known rich in anthocyanin compounds that has activities as antipollutants, so it has potential to be developed as clay facial soap. Soap is formed by the saponification reaction between fatty acids and strong bases which generally has high pH properties. The anthocyanin compound in roselle extract is unstable at base pH. In addition, there are crucial parameters such as pH, viscosity and foam stability that must be eligible to be accepted as cleanser product for facial skin. This study aimed to obtain an optimal formula for clay facial soap containing roselle flower extract by optimizing concentration of surfactant SLES and KOH as soap-forming components. Soap basis was made by mixing the base with fatty acid phase. Design Expert 13 software, one-way ANOVA, and T-Test SPSS were used to design, analyze the effect and predict optimum mixed components in the formula so the final product met the ideal parameters. The data of study showed that the optimal formula of roselle flower clay facial soap should have 9.5% of SLES and 5.25% KOH with a desirability value of 1. The optimum formula had organoleptic, homogeneity, pH, viscosity and foam stability parameters that met the requirements.
Implementation of Energy Harvesting Technology for Sustainable Infrastructure Projects Timotius Alfanov; Oei Fuk Jin
JRST (Jurnal Riset Sains dan Teknologi) Volume 9 No. 2 September 2025: JRST
Publisher : Universitas Muhammadiyah Purwokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30595/jrst.v9i2.25952

Abstract

Digital construction has become an important strategy in promoting the Sustainable Development Goals (SDGs) set by the United Nations, especially in the context of infrastructure development. The purpose of this research is to discuss the development of Energy Harvesting (EH) technologies that have been investigated in infrastructure to date. By utilizing energy in the surrounding environment, EH technology offers great potential in reducing carbon emissions generated by infrastructure systems.  This study employs the Systematic Literature Review (SLR) method, involving a structured process of literature search in the Scopus database, selection based on abstracts and content relevance, and in-depth analysis of 27 qualified articles. This research discusses five of the most common EH technologies, namely photovoltaic, piezoelectric, thermoelectric, Wind Energy Conversion System (WECS), and Wind Energy Converter (WEC) technologies. Each technology was evaluated based on its application in infrastructure with a focus on the efficiency and effectiveness of the application of the technology. The results indicate that Photovoltaic and Piezoelectric technologies are the most ready for short-term implementation, while Thermoelectric and WEC technologies show strong long-term potential despite facing technical and economic challenges. Hybrid combinations of multiple technologies have also been proven to enhance efficiency compared to single systems. The harvested energy can be utilized for various infrastructure needs, such as street lighting and Structural Health Monitoring (SHM) systems. This study recommends the application of hybrid technologies as a more efficient solution, tailored to the characteristics of the location and type of infrastructure. In addition, policy support and incentives are needed to accelerate the adoption of these technologies. By implementing these strategies, the construction industry can significantly contribute to achieving the UN's 2030 agenda for sustainable development.
Development of a Small-Capacity Tensile Testing Machine for Educational Demonstration Paryana Puspaputra; Hendra Setiawan; Arif Rahman Hakim
JRST (Jurnal Riset Sains dan Teknologi) Volume 9 No. 2 September 2025: JRST
Publisher : Universitas Muhammadiyah Purwokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30595/jrst.v9i2.26246

Abstract

The tensile testing machine is a device used to characterize the mechanical properties of materials. Most tensile testing machines currently available are designed for high-capacity applications, such as testing metals and concrete, making them less suitable for testing composite and plastic materials. Therefore, a small-capacity tensile testing machine that is more flexible and efficient is needed for testing and educational purposes. This study aims to develop and improve the performance of a small-capacity tensile testing machine by enhancing its control system and human interface. Improvements include increasing the displacement sensor sensitivity from 200 mm to 50 mm, using a load cell with a more appropriate capacity (reduced from 2 tons to 1 ton), and adding a data logging feature via USB in text format. The test results indicate that the developed system is capable of performing tensile tests in accordance with ASTM D638 standards, with higher accuracy compared to the previous version. The implementation of the new control system also enables better data recording, thereby enhancing the machine's reliability as a tool for education and research.

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