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SCIENCE TECH: Jurnal Ilmiah Ilmu Pengetahuan dan Teknologi
Published by Universitas Sarjanawiyata Tamansiswa
ISSN : 24606286     EISSN : 25793624     DOI : 10.30738/science tech.v2i1.396
Core Subject : Science, Agriculture, Engineering,
Agriculture, Biological Sciences & Forestry Chemistry Computer Science & IT Engineering Materials Science & Nanotechnology
Jurnal SCIENCE TECH adalah jurnal yang diterbitkan oleh Lembaga Penelitian dan Pengabdian kepada Masyarakat (LP2M) Universitas Sarjanawiyata Tamansiswa (UST) Yogyakarta. Jurnal ini diharapkan sebagai media bagi dosen, peneliti, praktisi, mahasiswa dan masyarakat luas yang memiliki perhatian terhadap bidang dan perkembangan ilnu pengetahuan dan teknologi. Jurnal SCIENCE TECH terbit dua kali setahun yaitu Januari dan Agustus, setiap terbit 8 artikel.
Arjuna Subject : Umum - Umum
Articles 165 Documents
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Analisis Debit, Head, dan Tekanan Air Tandon untuk Energi Alternatif Berbantuan Teknologi Water Flow Novitasari; Zulfan Yus Andi; Harwadi; Zulfitrianto; Ramli; Zanu Saputra; Muhammad Raihan As Shadqi; Sumi Lasari
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 12 No 2 (2026): August
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/st.vol12.no2.a22322

Abstract

The use of household water tanks is typically limited to storing water pumped from wells, though positioning a tank at height can generate alternative energy as water flows out. The contribution of flow rate, head, and water pressure offers an opportunity for water flow technology to convert this energy into small-scale electricity. This study aims to analyze the effect of the placement point of water flow technology on the electrical energy generated, examined through flow rate, head, and water pressure, to determine the optimal placement configuration. A descriptive-experimental method was employed with three independent variables (measurement point position, water tank capacity, and pipe diameter) resulting in eight combinations of measurement variations. The dependent variables measured were flow rate, water pressure, and generator voltage, with each measurement repeated three times for 60 seconds. Results showed that the optimal voltage of 25 VAC was achieved using a ½-in pipe diameter, a water tank positioned 4 m above ground level, and the water flow technology placed 50 cm above ground level. This voltage can be used for emergency LED lighting or, with an energy storage component and DC conversion, as a household power bank.
Efektivitas Pemberian Beberapa Bahan Organik pada Pertumbuhan Tanaman Cabai Rawit (Capsicum frutescens L.) Farah Nadya; Mizan Maulana; Hilda Pratiwi
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 12 No 2 (2026): August
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/st.vol12.no2.a22358

Abstract

Cayenne pepper (Capsicum frutescens L.) is an important horticultural crop whose productivity is strongly influenced by soil fertility and nutrient availability. This study aimed to evaluate the effect of organic matter application on the growth and yield of cayenne pepper and to determine the most effective application rate. The experiment was conducted using a non-factorial Randomized Block Design (RBD) with one factor consisting of four organic matter rates: control (without organic matter), 25 g, 50 g, and 75 g per plant. Observed variables included plant height, number of fruits, fruit weight, and root length. Data were analyzed using analysis of variance (ANOVA) followed by the Honest Significant Difference (HSD) test at the 5% significance level. The results showed that organic matter application had no significant effect on plant height at 15 and 45 days after planting (DAP), but significantly affected plant height at 30 DAP. The 25 g treatment produced the highest plant height at 30 DAP (47.69 cm), the highest number of fruits (185.06 fruits per plant), and the highest fruit weight (159.19 g per plant). Meanwhile, the longest root length was obtained from the 50 g treatment (19.50 cm). In general, the application of organic matter improved plant growth and yield compared with the control treatment. Based on all observed parameters, the application rate of 25 g per plant was the most effective treatment, providing the best overall response in the growth and productivity of cayenne pepper
Evaluasi Postur Kerja pada Proses Pengamplasan Menggunakan REBA dan NBM di CV XYZ Samarinda Dedi Irawan; Muhammad Syarif; Kusmendar Kusmendar
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 12 No 2 (2026): August
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/st.vol12.no2.a23054

Abstract

This workplace case study evaluated sanding postures at CV XYZ using Rapid Entire Body Assessment (REBA) and the Nordic Body Map (NBM). The two workers included represented the operational personnel assigned to the sanding station during the observation period. Both workers performed prolonged bending and squatting postures. NBM scores identified the upper neck, back, and waist as the areas with the highest discomfort, while the initial REBA score was 8, indicating high risk. A standing posture and an anthropometry-based workbench were then developed and simulated in EasyPose. The simulated posture produced a REBA score of 3, or low risk. The recalculated workbench dimensions were 95 cm in height, 70 cm in width, and 161 cm in length. These findings indicate a potential reduction in postural risk, but they do not constitute field validation. Implementation and repeated REBA and NBM measurements are therefore required to confirm changes in discomfort, usability, and work performance.
Perancangan Turbin Angin Sumbu Vertikal Tipe Savonius 3 Sudu sebagai Sumber Energi Alternatif untuk Wilayah Berkecepatan Angin Rendah Syaiful Anwar; Abdurahim Sidiq; Gusti Rusydi Furqon Syahrillah
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 12 No 2 (2026): August
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/st.vol12.no2.a23445

Abstract

This study designed, fabricated, and experimentally evaluated a three-bladed Savonius vertical-axis wind turbine for low-wind-speed conditions. The engineering experiment comprised a literature review, specification definition, three-dimensional modeling in SolidWorks, prototype fabrication, and controlled wind-tunnel testing. The rotor used three semi-cylindrical aluminum blades with a blade diameter of 0.60 m, an effective rotor diameter of 1.186 m, a rotor height of 0.96 m, and a swept area of 1.13856 m². Tests were conducted at wind speeds of 3.5, 4.0, 4.5, 5.0, and 5.5 m/s, with rotor speed and torque measured in three repetitions for each condition. Increasing wind speed from 3.5 to 5.5 m/s increased the average rotor speed from 57.80 to 104.27 rpm, torque from 0.40 to 0.80 N·m, and mechanical power from 2.42 to 8.74 W. The tip speed ratio ranged from 1.03 to 1.21, while the mechanical power coefficient ranged from 7.53% to 8.69%, with the maximum mechanical power coefficient of 8.69% obtained at 4.0 m/s. The prototype operated across the investigated low-wind-speed range, but only one three-bladed configuration was evaluated; further optimization of rotor geometry, mechanical transmission, and generator matching is required.
Pencegahan Korosi pada Permukaan Baja Menggunakan Bio-Inhibitor yang Diekstrak dari Kulit Nanas Yuli Panca Asmara; Mujiburrahman; Irawan Noor; Ihwan Ghazali; Agus Wiramsya Oscar; Firda Herlina; Muhammad Renaldy Syahputra
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 12 No 2 (2026): August
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/st.vol12.no2.a23548

Abstract

Corrosion is a major problem affecting the durability of steel materials, creating a need for effective and environmentally friendly corrosion-control methods. This study evaluated the effectiveness of pineapple peel extract as a corrosion inhibitor for ST 42 steel in rainwater at immersion durations of 7 and 20 days. The gravimetric weight-loss method was used to determine the corrosion rate based on the mass loss of the steel specimens. Six ST 42 steel specimens were used individually for the experimental conditions, with one specimen representing each condition. Uninhibited specimens were immersed in rainwater and seawater for comparison, while pineapple peel extract was evaluated as an inhibitor only in rainwater. The uninhibited ST 42 specimens immersed in rainwater showed corrosion rates of 0.0952 and 0.1000 g/(cm²·day) after 7 and 20 days, respectively. In contrast, the specimens treated with pineapple peel extract showed no measurable mass loss, resulting in a calculated corrosion rate of 0.0000 g/(cm²·day) at both immersion durations. The calculated inhibition efficiency of the pineapple peel extract was therefore 100% at both 7 and 20 days. The uninhibited specimens in seawater showed corrosion rates of 0.0952 and 0.1000 g/(cm²·day) after 7 and 20 days, respectively, which were identical to those observed in rainwater. These results indicate the potential of pineapple peel extract as a plant-based corrosion inhibitor for ST 42 steel in rainwater under the tested conditions. However, the results should be interpreted cautiously because each condition was represented by a single specimen and the resolution of the digital scale was not documented.

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