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FaST : Jurnal Sains dan Teknologi
Published by Universitas Pelita Harapan
ISSN : -     EISSN : 25989596     DOI : -
Core Subject : Science, Social,
Computer Science & IT Environmental Science
Started in 2017, FaST publishes articles in the areas of science and technology, particularly in food technology, biology, electrical engineering, industrial engineering, mathematics and civil engineering. Articles are either reviews and/or research results.
Arjuna Subject : -
Articles 11 Documents
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Search results for , issue "Vol. 10 No. 1 (2026): MAY" : 11 Documents clear
3D-Printed Porous Tantalum Scaffolds for Bone Regeneration: A Narrative Review of Structural Design, Biological Performance, and Clinical Applications Lizar, Michael; Ma, Xingshuang
FaST : Jurnal Sains dan Teknologi Vol. 10 No. 1 (2026): MAY
Publisher : Universitas Pelita Harapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19166/fastjst.v10i1.10486

Abstract

Bone fractures remain a major clinical challenge in orthopedic surgery, requiring biomaterials that closely mimic the structural and mechanical properties of native bone. Although titanium and its alloys are widely used, their limited porosity and elastic modulus mismatch may compromise osseointegration and long-term implant stability. Three-dimensional (3D)-printed porous tantalum (Ta) scaffolds have emerged as promising alternatives due to their high biocompatibility, corrosion resistance, and osteoconductive potential. This narrative review comprehensively evaluates the structural design, additive manufacturing strategies, mechanical performance, biological interactions, and clinical applications of 3D-printed porous Ta scaffolds for bone regeneration. Particular attention is given to scaffold architecture, pore geometry optimization, and scaffold–cell interactions, including the incorporation of bone marrow–derived mesenchymal stem cells (BMSCs). Advances in additive manufacturing techniques, such as Selective Laser Melting and Laser Engineered Net Shaping, enable the fabrication of highly interconnected porous structures with bone-mimetic mechanical properties. Evidence from in vitro and in vivo studies indicates that pore sizes of 400–600 µm and porosity around 80% provide a favorable microenvironment for cell adhesion, proliferation, and osteogenic differentiation. Functionalization strategies and activation of osteogenic signaling pathways further enhance mineralization and interfacial integration. Overall, the integration of 3D-printed porous Ta scaffolds with regenerative cellular strategies represents a promising approach for bone defect repair, spinal fusion, and joint reconstruction. Continued optimization of scaffold design and validation through long-term clinical studies are essential to facilitate translational application.
Asesmen Kualitas RTH Publik Menggunakan Indeks Vegetasi di Taman Hutan Raya Ir. H. Djuanda Kota Bandung Raden, Sutadiwangsa, Muhammad Alwan Faris Fadlirullah; Adytia Heru Nugraha; Ammar Muhammad Nabil; Yulia Asyiawati
FaST : Jurnal Sains dan Teknologi Vol. 10 No. 1 (2026): MAY
Publisher : Universitas Pelita Harapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19166/fastjst.v10i1.10492

Abstract

Urban forest ecosystems are increasingly subject to significant anthropogenic pressures; however, the resulting ecological responses often exhibit a delayed manifestation. The Ir. H. Djuanda Forest Park (Tahura) serves as a vital urban conservation area in Bandung,  Indonesia, which has experienced a massive surge in tourist volume. This study aims to analyze the "lag effect" of visitor pressure on vegetation quality dynamics over the 2015–2025 period. A descriptive quantitative approach was employed, integrating spatial analysis via Google Earth Engine (GEE) to extract Normalized Difference Vegetation Index (NDVI) values from Sentinel-2A satellite imagery. Statistical analyses, including Spearman correlation and linear regression, were conducted with time-lag intervals ranging from 0 to 5 years to identify the relationship between annual visitor numbers and the extent of high-density vegetation. The findings reveal no significant correlation at lag 0 (ρ = –0.12; p > 0.05). Conversely, a significant negative correlation emerged at lag 3 (ρ = –0.61; p < 0.05) and reached its peak at lag 5 (ρ = –0.78; p < 0.01). These results demonstrate a threshold of vegetation resistance, where physical degradation only becomes spectrally manifest after several years of cumulative disturbance. This study recommends the implementation of visitor management policies based on environmental carrying capacity that incorporate temporal variables to ensure the long-term sustainability of the Tahura Ir. H. Djuanda ecosystem.
Effect of Steaming Time on The Protein Quality and Functional Properties of Soybean Paste Crisly, Natasya; Soedirga, Lucia Crysanthy
FaST : Jurnal Sains dan Teknologi Vol. 10 No. 1 (2026): MAY
Publisher : Universitas Pelita Harapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19166/fastjst.v10i1.10884

Abstract

Thermal processing is essential for enhancing the nutritional quality and protein digestibility of soybeans. Steaming, which uses hot vapor to minimize direct contact between the food and water, as in boiling, thereby better preserves nutrient content. However, excessive heating can decrease the quality and functional properties of the protein; therefore, the selected cooking time, specifically the steaming time, must be determined. This study investigated the effects of varying steaming times (25, 40, and 55 minutes) on the protein quality—specifically protein content and in-vitro protein digestibility—and functional properties, including emulsion stability and water holding capacity, of soybean paste. Results indicated that prolonged steaming significantly reduced both protein quality and functional properties. Extended thermal exposure resulted in excessive protein denaturation and aggregation, thereby disrupting the structural integrity required for effective water binding and emulsion stabilization. The selected steaming time was 25 minutes, yielding a protein content of 29.62 ± 1.10% and an in vitro protein digestibility of 44.40 ± 0.36%. Furthermore, at this selected steaming time, the soybean paste exhibited the highest emulsion stability and water holding capacity values of 92.79±1.76% and 71.25±1.77%, respectively. These findings support SDG 2 (Zero Hunger), SDG 3 (Good Health and Well-being), and SDG 12 (Responsible Consumption and Production) by establishing a resource-efficient method for producing high-quality, sustainable plant-based proteins. This 25-minute steaming duration establishes a standardized approach to enhancing the nutritional and functional profiles of soybean-based ingredients.
Pemanfaatan Kitosan Kepiting Bakau (Scylla serrata) dan Ion Ag+ dalam Pembuatan Lapisan Antibakteri pada Casing Handphone Parhusip, Dr. Adolf J.N.; Sari , Esli Yunita; Ruslim , Donna Calistalia; Tiono , Jessica Adelia
FaST : Jurnal Sains dan Teknologi Vol. 10 No. 1 (2026): MAY
Publisher : Universitas Pelita Harapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19166/fastjst.v10i1.10886

Abstract

Casing handphone berfungsi melindungi handphone dari kotoran dan risiko kerusakan, namun juga berpotensi menjadi media pertumbuhan bakteri seperti Staphylococcus aureus. Untuk mengatasi masalah tersebut, dikembangkan lapisan antibakteri pada casing handphone yang terdiri dari epoxy resin dengan kombinasi kitosan Scylla serrata dan ion Ag⁺ dari AgNO₃ sebagai agen antibakteri. Penelitian ini bertujuan untuk mengetahui efektivitas kitosan Scylla serrata dan ion Ag⁺ dalam lapisan antibakteri serta menentukan rasio perbandingan terbaik dalam menghambat pertumbuhan Staphylococcus aureus. Penelitian dilakukan secara in vitro menggunakan metode difusi agar sumuran pada media Nutrient Agar. Larutan kitosan–AgNO₃ sebanyak 75 µL dengan rasio (C:Ag⁺) 0:1, 1:0, 1:1, 2:1, dan 1:2 diuji terhadap bakteri. Epoxy resin dengan etanol absolut 99,9% digunakan sebagai kontrol negatif, sedangkan amoksisilin 100 ppm sebagai kontrol positif. Zona hambat diukur dalam satuan milimeter dan dianalisis menggunakan uji normalitas, homogenitas, Oneway ANOVA, dan Games-Howell. Hasil menunjukkan bahwa rasio 0:1 dan 1:0 memiliki daya hambat tertinggi, sedangkan kombinasi kitosan–Ag⁺ paling efektif pada rasio 1:1.
Analisis Risiko Beban Kerja dengan Metode NIOSH Lifting Equation dan Rapid Entire Body Assessment pada Aktivitas Dumping Aditif di PT X Hermawan , Dani; Christiani, Agustina
FaST : Jurnal Sains dan Teknologi Vol. 10 No. 1 (2026): MAY
Publisher : Universitas Pelita Harapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19166/fastjst.v10i1.10891

Abstract

Additive dumping activities at PT X are characterized by manual, repetitive lifting of sacks and frequent bending postures, which may increase the risk of developing Musculoskeletal Disorders (MSDs). Based on the results of the Cornell Musculoskeletal Discomfort Questionnaire (CMDQ), the predominant area of reported discomfort was the lower back. This study aimed to evaluate workload risks using the NIOSH Lifting Equation and the Rapid Entire Body Assessment. The initial assessment indicated a high-risk lifting task, with a Composite Lifting Index of 1.1307, exceeding the recommended threshold of 1.00, and a REBA score of 10, signifying a high level of risk. An ergonomic intervention involving the implementation of a Manual Hydraulic Stacker Forklift was proposed to elevate the initial load to waist height, thereby improving worker posture. Simulation results of the proposed intervention demonstrated a reduction in the lifting index to 0.88 and a substantial decrease in the REBA score to 3, corresponding to a low-risk category. These findings underscore the effectiveness of material handling equipment in mitigating musculoskeletal risk factors.
Analisis Sistem Antrian di Indomaret Fresh Bitung dengan Pendekatan Teori Antrian dan Simulasi Purba, Nanda Dwi Putra; Sylvia, Sylvia; Rifqi Bilal Kumara; Yoga Rendika; Yoga Putranto; Nuryudha Darmawan
FaST : Jurnal Sains dan Teknologi Vol. 10 No. 1 (2026): MAY
Publisher : Universitas Pelita Harapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19166/fastjst.v10i1.10892

Abstract

This study analyzes the performance of the cashier queueing system at Indomaret Fresh Bitung using observational data on inter-arrival times and service times, integrated with simulation modeling. The data collected indicate that customer inter-arrival times follow an exponential distribution. The analysis demonstrates that shorter inter-arrival times substantially increase waiting times and server utilization. During peak hours, an average inter-arrival time of 1.21 minutes results in an average waiting time of 0.769 minutes and a server utilization rate of 60%, indicating that the cashier operates near maximum capacity. In contrast, during non-peak hours, a longer average inter-arrival time of 1.832 minutes reduces system workload, leading to a shorter average waiting time of 0.341 minutes and increasing the probability of server idleness to 62.5%. Combined simulation results reveal a relatively balanced operational condition with an overall utilization level of 50%. Overall, the findings confirm that shorter inter-arrival times increase the likelihood of queue formation; therefore, optimal resource allocation during peak periods is necessary to maintain service efficiency.
Sistem Monitoring Schedule Compliance untuk Pengendalian Shortage Material pada Proses Produksi Extruder Aji Firmansyah , Daffa; Rahayu, Priskila Christine
FaST : Jurnal Sains dan Teknologi Vol. 10 No. 1 (2026): MAY
Publisher : Universitas Pelita Harapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19166/fastjst.v10i1.10895

Abstract

Compliance schedule management for extruder machines in manufacturing environments is often still performed manually, leading to reporting delays, recording errors, and limited visibility of schedule adherence and material readiness. This study aims to develop a digital-based compliance schedule monitoring system to improve the effectiveness of production schedule control, material availability tracking, and detection of non-conforming schedules. The system was developed using the Rapid Application Development (RAD) approach, which includes requirement planning, system design (use case diagram, data flow diagram, and entity relationship diagram), prototype development, and implementation testing in an operational environment. The proposed system integrates production schedule data, material usage, material shortage information, and compliance status into a centralized dashboard displaying real-time performance and compliance indicators. Testing results show a significant reduction in monitoring time from 38.63 minutes in the manual system to 0.61 minutes using the proposed system, resulting in a time efficiency improvement of 98.42%. Furthermore, the system enhances information transparency, decision-making speed, and reporting accuracy. Therefore, the developed system is effective in supporting data-driven operational control in manufacturing production processes.
Design of a Two-Point Temperature Monitoring System on a Heating Medium Based on Arduino Mega 2560 and IoT Anggara, Nataly Wisnu; Rhizma, Mario Gracio Anduinta
FaST : Jurnal Sains dan Teknologi Vol. 10 No. 1 (2026): MAY
Publisher : Universitas Pelita Harapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19166/fastjst.v10i1.10897

Abstract

This research aims to design a two-point temperature monitoring system using 2 DS18B20 sensors on a heating medium using DS18B20 sensors controlled by an Arduino Mega 2560 and integrated with Internet of Things (IoT) technology. The measured data are processed by the microcontroller and transmitted via the ESP8266 module to the Firebase platform, then displayed on a smartphone application and recorded as historical data. The experimental results show that the DS18B20 sensors are able to read temperature changes linearly within the tested temperature range of approximately 27°C to 67°C and can follow the temperature increase trend of the heating medium. To improve measurement accuracy, calibration was performed using a linear regression method with a surface thermocouple as the reference instrument. After calibration, the measurement error was significantly reduced to 2.90% at the upper measurement point and 2.66% at the lower measurement point, indicating that the system is more representative for monitoring temperature changes at two measurement locations. The proposed demonstrates decent performance as an IoT-based temperature monitoring prototype, making it suitable for small-scale heating applications and educational purposes.
Assessment of Rainwater Quality from Rainwater Storage in Ende, East Nusa Tenggara Province, Indonesia Nggae, Yohanes Erik Kurniawan; Supraba, Intan; Triatmadja, Radianta
FaST : Jurnal Sains dan Teknologi Vol. 10 No. 1 (2026): MAY
Publisher : Universitas Pelita Harapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19166/fastjst.v10i1.10932

Abstract

Using rainwater as an alternative water source requires careful attention to its quality, particularly in simple storage systems. This study aims to analyze changes in the physical, chemical, and microbiological quality of rainwater stored in a tank over a specified period, as well as the effects of maintenance practices on rainwater harvesting systems. The research methodology involved collecting samples of untreated rainwater and rainwater stored in a tank over four weeks. Physical parameters analyzed included color, turbidity, and total dissolved solids (TDS); chemical parameters included pH; and microbiological parameters included total coliforms and Escherichia coli. The results indicate that poor roof surface and gutter system cleanliness led to increased turbidity and noticeable changes in rainwater color. Following roof and gutter cleaning, improvements in the physical quality of the stored rainwater were observed. However, an anomaly in turbidity occurred during the third week, reaching 52 NTU. TDS values decreased throughout the storage period, while the pH of the rainwater remained within a neutral range. From a microbiological perspective, the concentrations of total coliforms and E. coli decreased significantly over the storage period, presumably due to limited nutrient availability and unfavourable environmental conditions for bacterial growth. The boiling process was effective in reducing bacterial concentrations; however, total coliforms and E. coli were still detected at levels of 11 CFU/100 mL and 4.4 CFU/100 mL, respectively. These findings demonstrate that stored rainwater requires further treatment prior to use, particularly for potable purposes.
Pemanfaatan Probiotik Lactobacillus casei dan Lactobacillus plantarum dalam Yoghurt Berbasis Susu Kacang Arab (Cicer Arietinum L.) dengan Perendaman Natrium Bikarbonat dan Penambahan Stevia Prananto, Jennifer Felicia; Parhusip, Dr. Adolf J.N.
FaST : Jurnal Sains dan Teknologi Vol. 10 No. 1 (2026): MAY
Publisher : Universitas Pelita Harapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19166/fastjst.v10i1.10960

Abstract

Yogurt is a functional food product rich in probiotics and plays a vital role in maintaining digestive health and the immune system. Animal-based yogurt contains lactose and cholesterol, making it unsuitable for those with lactose intolerance. Therefore, lactose-free, high-protein, and nutrient-rich chickpea milk can be an alternative ingredient for plant-based yogurt. However, chickpea yogurt has quite an unpleasant taste and aroma, as well as a bitter aftertaste due to phenolic compounds and lipoxygenase enzyme activity. This study aims to develop chickpea milk yogurt with optimal sensory and nutritional quality by soaking chickpeas in sodium bicarbonate solution (0, 1, 2, 3%; 8, 16, 24 hours), adding stevia (0.044, 0.088, 0.133%) as a low-calorie sweetener, and using a combination of probiotics Lactobacillus casei and Lactobacillus plantarum (1:0, 2:1, 1:1, 1:2, 0:1) to support fermentation and yogurt stability. The results of the analysis showed that variations in the ratio of bacteria and stevia concentration significantly affected pH, total lactic acid, total LAB, total sugar, and protein, with a formulation of a 1:1 bacterial ratio and 0.088% stevia providing a pH of 4.1±0.04, protein 6.1±0.04%, lactic acid 0.96±0.01%, total sugar 1.65±0.00%, good fermentation efficiency, high LAB viability (9.27±0.04 log CFU/ml), and the highest sensory acceptance. This combination is recommended as the best formulation for chickpea milk yogurt with optimal chemical, microbiological, and sensory qualities

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