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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 dan Perencanaan Struktur Perkerasan Lentur Jalan Berdasarkan MDPJ No. 03/M/BM/2024 Robiatul Adawiyah; Akhmad Gazali; Tezar Aulia Rachman
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 12 No 1 (2026): February
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/st.vol12.no1.a20971

Abstract

The revision of pavement design standards may significantly influence the determination of pavement thickness and structural configuration. This study aims to determine the design thickness of flexible pavement structure on the Kampung Baru – Beruntung Jaya road section based on the Manual Desain Perkerasan Jalan (MDPJ) No. 03/M/BM/2024 and to compare the results with MDPJ No. 02/M/BM/2017. The research employed a quantitative approach using traffic data (LHR and axle loads) and subgrade strength (CBR) as primary design parameters. The analysis shows that, based on Design Chart-4 of MDPJ 2024, the required pavement structure consists of 50 mm HRS-WC, 150 mm LFA Class A, and 150 mm LFA Class B (or natural gravel/stabilized layer with CBR > 10%). Compared to MDPJ 2017, MDPJ 2024 applies refined traffic classification and stricter CBR criteria, resulting in a more structured and adaptive design approach. The updated methodology provides improved technical control over pavement thickness determination and has the potential to enhance long-term pavement performance and reliability.
Integrasi Servicescape, HEALTHQUAL, dan Model Kano dalam Evaluasi Pengalaman Pasien Griya Sehat UKDC Surabaya Nyoman Sri Widari; Desrina Yusi Irawati; Fidelchristo Pijoh
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 12 No 1 (2026): February
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/st.vol12.no1.a21482

Abstract

The growing demand for holistic healthcare services requires comprehensive evaluation of service quality beyond therapeutic outcomes. This study examines patient experience in acupuncture and herbal services at Griya Sehat UKDC by integrating servicescape and HEALTHQUAL dimensions and classifying service attributes using the Kano model to determine improvement priorities. A case study design with a survey approach was conducted involving 32 patients. Data were collected through paired functional and dysfunctional Kano questionnaires, followed by validity and reliability testing. The results show that 76.3% of service attributes fall into the one-dimensional category, indicating that patient satisfaction is primarily driven by service performance. Therapist competence, safety assurance, empathy, cleanliness, and treatment efficiency emerge as critical determinants. These findings suggest that improving core service execution has a direct linear impact on patient satisfaction in holistic healthcare settings.
Perbaikan Laju Peningkatan Kuat Tekan Beton dengan Air IPAL Industri Beton Siap Pakai Menggunakan Accelerator Prasetya Adi; Arusmalem Ginting; Elin Widiastuti; Dewi Listyowati
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 12 No 1 (2026): February
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/st.vol12.no1.a21601

Abstract

The concrete industry is one of the industries that uses large volumes of water. Water is used for the cement reaction process and for cleaning equipment. Wastewater treatment plants (WWTPs) are used to restore water quality before being released into the environment. This study was conducted to determine the suitability of treated wastewater for reuse in concrete production. Using WWTP water as a cement reagent is important for conserving groundwater and supporting the sustainability of the ready-mix concrete industry. Previous research has shown that the disadvantage of using treated wastewater in ready-mix concrete is low initial compressive strength. A practical way to increase initial compressive strength is to use an accelerator. Research is needed to increase initial compressive strength for several concrete grades. The use of water as a cement reagent requires certain quality standards, and the higher the planned concrete quality, the better the water quality required, approaching or equivalent to potable water. The study was conducted on two concrete grades to determine the effect of using wastewater treatment for ready-mix concrete on the properties of the resulting concrete. The concrete's compressive strength was tested using a standard test, using a cylinder with a diameter of 150 mm and a height of 300 mm, and workability was tested using an Abrahms cone. Previous research has shown that the use of treated wastewater affects the speed of the concrete hardening process. Therefore, in this study, an accelerator, an additive, was used to accelerate the cement reaction. The results of the study showed that the accelerator added material increased the quality of 20 MPa concrete by 114.452%, 112.091%, 105.671%, and 103.351% compared to concrete with normal water and increased the quality of 25 MPa concrete by 103.909%, 103.442%, 105.940%, and 108.756% compared to concrete with normal water. The rate of increase in the compressive strength of concrete with wastewater without accelerator and using accelerator can meet the requirements.
Pengaruh Penyetelan Sudut Toe dan Tekanan Ban Terhadap Hasil Uji Side Slip Tester pada Mikrobus Isuzu NLR 55B LX Ni Putu Yana Teja Pertiwi; Joko Winarno; Mochamad Syamsiro; Sri Gati Hutomo
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.a22186

Abstract

Front wheel alignment and tire pressure are important factors affecting vehicle stability, comfort, and driving safety during operation. This study aimed to analyze the effect of toe angle adjustment and tire pressure variation on side slip test results in the Isuzu NLR 55B LX microbus. The research employed an experimental method conducted at the Motor Vehicle Testing Unit of the Department of Transportation of Magelang City using an HPA side slip tester manufactured in 2004. The experimental variables consisted of three toe angle variations (-0°25′, +0°15′, and +0°25′) and three tire pressure variations (35, 50, and 65 psi), while the front wheel deviation data were analyzed descriptively and comparatively. The results showed that non-standard toe angle and tire pressure settings produced side slip values exceeding the allowable roadworthiness threshold of ±5 mm/m, with the highest deviation reaching -14.7 mm/m under low tire pressure and below-standard toe angle conditions. In contrast, the standard toe angle setting (+0°15′) with a tire pressure of 50 psi produced a side slip value of 3.6 mm/m, which remained within the acceptable threshold. Both under-inflated and over-inflated tire conditions were found to increase wheel deviation due to changes in tire-road contact characteristics. This study confirms that proper toe angle adjustment and tire pressure settings play an important role in maintaining vehicle stability, improving driving safety, and extending tire service life.
Analisis Proses Perawatan Preventif Beberapa Komponen dalam Sebuah Mesin dan Pengaruhnya terhadap Kapasitas Produksi (Studi Kasus: Mesin Kiln Putar di Industri Ubin Keramik) David Andrian
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.a21952

Abstract

Effective preventive maintenance is essential for maintaining machine availability and improving productivity in manufacturing industries. This study aims to analyze preventive maintenance scheduling strategies for multiple components within a single machine and evaluate their impact on downtime and production capacity in rotary kiln machines used in the ceramic tile industry. A quantitative approach was employed using four rotary kiln machines in a ceramic tile manufacturing company located in Gresik, East Java, Indonesia. The analysis was conducted by developing a cost-based model that compares separate and grouped maintenance schedules based on optimal maintenance intervals, opportunity costs, schedule shifting costs, and component failure risks. The results indicate that the optimal maintenance strategy varies among machines. For Kiln IA, Kiln IB, and Kiln IIB, separate maintenance scheduling for each component resulted in lower total maintenance costs, whereas for Kiln IIA, grouping the maintenance schedules of the roll, bearing, and burner produced the minimum total cost of IDR 18,640,607. These findings suggest that grouped maintenance is feasible when the optimal maintenance intervals of different components are relatively close, thereby reducing the frequency of machine downtime. The proposed preventive maintenance schedules also reduced annual downtime by 28.62–77.02%, with the highest efficiency achieved by Kiln IIA at 77.02%. The study demonstrates that the effectiveness of grouped maintenance scheduling is strongly influenced by the proximity of optimal maintenance intervals and the balance between opportunity costs and schedule shifting costs. Therefore, an integrated cost-based preventive maintenance scheduling approach can serve as a decision-making tool for improving machine availability and production capacity.
Karakteristik Kadar Abu Serbuk Gergaji Kayu Jati Setelah Pencucian Berdasarkan Analisis Proksimat Muhammad Arief Saputro; Mochamad Syamsiro; Noesanto Dewantoro Ahmad; Bayu Megaprastio; Dimas Noor Ardianto
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.a22533

Abstract

Teak sawdust biomass has potential as a solid fuel; however, its high ash and inorganic mineral contents adversely affect its fuel quality and thermal performance. Previous studies on biomass leaching generally evaluated process effectiveness solely based on mass loss after leaching, so the relationship between mass reduction and the actual decrease in ash content has not been fully verified. Therefore, this study emphasizes the verification of ash reduction through proximate analysis as a more representative indicator of biomass quality, while also evaluating its effect on improving calorific value. This study aimed to compare the effectiveness of leaching using deionized water and 1 M HCl in reducing ash content and increasing calorific value. The experiment was conducted using solid-to-liquid ratios of 1:25, 1:50, and 1:75, with 2 h of stirring, drying at 105 °C, followed by proximate and calorific value analyses. The results showed that leaching with 1 M HCl effectively reduced the ash content by 30%, from 2.013% in the raw biomass to 1.402%, whereas leaching with deionized water did not result in a significant reduction in ash content. In addition, the calorific value increased by 1.078 MJ/kg, from 17.629 MJ/kg in the raw biomass to 18.707 MJ/kg after leaching with 1 M HCl. Overall, 1 M HCl exhibited superior demineralization performance compared to deionized water. These findings indicate that acid leaching significantly improves fuel quality by reducing inorganic mineral content and increasing energy density.
Pengendalian Kualitas Palet Kabel Kayu Berbahan Limbah Sisa Log dengan Integrasi Seven Tools dan QFD Lilis Nurhayati; David Andrian
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.a22101

Abstract

The utilization of log residue waste as an alternative raw material in the wood processing industry has the potential to improve resource efficiency; however, material heterogeneity often leads to product quality issues. This study aims to identify the dominant types of defects and their contributing factors in wooden cable pallets made from log residue waste, as well as to determine quality improvement priorities through the integration of Seven Tools of Quality and Quality Function Deployment (QFD). The study was conducted at UD Nurari Perdana Kabelindo, Sidoarjo, using production and defect data collected during September 2025 through observations, interviews, documentation, and questionnaires. The Seven Tools analysis employed check sheets, Pareto charts, and cause-and-effect diagrams to identify dominant defects and their root causes. The results were subsequently integrated into QFD through the development of a House of Quality to translate customer needs into priority technical characteristics. Customer requirements were determined based on product quality attributes obtained from 30 customer respondents using a census method. The results showed a defect rate of 11.51% of total production, with the dominant defects consisting of thickness deviation, wavy surfaces, knot defects, and asymmetrical circular shapes. The QFD analysis revealed that operator precision and raw material selection were the top priorities for quality improvement. These findings demonstrate that the integration of Seven Tools and QFD is effective in linking process defect analysis with customer needs to support sustainable product quality control.
Analisis Keausan dan Umur Pakai Screw pada Mesin Injection Molding untuk Material Polyamide (PA9T) Menggunakan Pendekatan Archard Wear Law Yulia Widhianti; Ahmad Syarif
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.a22851

Abstract

In manufacturing industries utilizing the injection molding process, the reliability of production machinery is a critical factor influencing production performance, product quality, and operational efficiency. Machine component failures, particularly in the screw, can lead to downtime, reduced productivity, and increased maintenance and production costs. Therefore, an analysis of component wear and service life is essential to support the implementation of effective maintenance strategies. This study aims to analyze the wear rate and service life of screws used in injection molding machines at PT XYZ. The investigation focuses on the effect of processing polyamide (PA9T) plastic material and compares the performance of coated and uncoated screws in terms of component durability. The research methodology includes direct observation of a Fanuc Roboshot α-S150 injection molding machine, wear analysis, and service life estimation using the Archard Wear Law approach. The results indicate that the coated screw has an actual service life of approximately 650,000 shots, whereas the uncoated screw has a service life of approximately 600,000 shots. Thus, the use of a coated screw increases component service life by 8.33% compared to an uncoated screw. These findings suggest that surface coating enhances screw resistance to wear mechanisms occurring during the processing of polyamide (PA9T) material. Furthermore, the study demonstrates that wear analysis can contribute to improved productivity through the implementation of regular and effective machine maintenance practices.
Dampak Pemberian Beberapa Jenis Mikoriza terhadap Pertumbuhan dan Hasil Tanaman Cabai Rawit (Capsicum frutescens L.) Anggie Febrisia Putri; Mizan Maulana; Naziratil Husna
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.a22382

Abstract

This study aimed to determine the effect of different types of Arbuscular Mycorrhizal Fungi (AMF) on the growth and yield of bird's eye chili (Capsicum frutescens L.). Chili productivity is often constrained by the low availability of phosphorus (P), highlighting the need for biofertilizers that enhance nutrient uptake efficiency. The study was conducted from April to July 2025 at the Suka Tani Sejahtera Coffee Plantation Business Research Center, Bireuen, Aceh. A non-factorial Randomized Complete Block Design (RCBD) was employed with four treatments and three replications, consisting of a control, Glomus sp., Acaulospora sp., and a combination of Glomus sp. + Acaulospora sp. The observed parameters included plant height, number of leaves, number of fruits, fruit weight, fresh shoot biomass, fresh root biomass, root length, and percentage of AMF root colonization. The results showed that AMF application produced different responses among the observed parameters. AMF application had no significant effect on plant height, number of leaves, or fresh shoot biomass, but significantly affected fruit weight, fresh root biomass, and root length. The Glomus sp. treatment produced the highest fresh root biomass (45 g), whereas Acaulospora sp. resulted in the highest number of fruits (350 fruits) and fruit weight (238.67 g). The combined AMF treatment produced the highest fresh shoot biomass (160.67 g), although it did not exhibit a better synergistic effect than the single-species treatments. The highest root colonization reached 48–50% at an application rate of 15 g per plant. In conclusion, Glomus sp. was more effective in promoting root system development, whereas Acaulospora sp. was more effective in improving the generative yield of bird's eye chili.
Pembuatan Bio-Based Film Aktif Berbahan Sekam Padi dengan Ekstrak Biji Pepaya dan ZnO untuk Mendukung Ketahanan Pangan Philosopia Asifati Asfa; Azaria Heilyn Pratista; Yasmin Qonitatillah Indaryadi; Tsalis Jauza Nareswari
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.a21862

Abstract

Rice husk waste is an abundant agricultural residue with potential as a raw material for bio-based materials. This study aimed to develop an active bio-based film from rice husk cellulose incorporated with papaya seed extract and zinc oxide (ZnO) and to evaluate its physical characteristics, water absorption, biodegradability, and antibacterial activity. A laboratory experimental design was employed using four formulations (F1–F4) with varying concentrations of papaya seed extract (0.97–6.25%) and ZnO (0.97–3.57%). The data were analyzed descriptively based on the characterization results of each formulation. The results showed that all formulations produced bio-based films with a uniform pale-yellow appearance, relatively smooth surfaces, and no visible cracks or air bubbles. The pH values ranged from 6 to 7, while water absorption after a 14-day test ranged from 40% to 50%. The biodegradability test showed that F1, F2, and F4 achieved 100% degradation within 24 hours, whereas F3 showed 89% degradation. Based on a descriptive comparison of the evaluated characteristics, F4 was selected for antibacterial testing because it showed a favorable combination of properties. F4 produced an inhibition zone of 13.5 ± 0.62 mm against Escherichia coli, which was classified as strong antibacterial activity. These findings indicate that the rice husk cellulose-based film incorporating papaya seed extract and ZnO has potential for development as a biodegradable active packaging material.

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